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);
220 svc_rpcb_cleanup(serv, net);
221 return err;
222 }
223
lockd_up_net(struct svc_serv * serv,struct net * net,const struct cred * cred)224 static int lockd_up_net(struct svc_serv *serv, struct net *net,
225 const struct cred *cred)
226 {
227 struct lockd_net *ln = net_generic(net, lockd_net_id);
228 int error;
229
230 if (ln->nlmsvc_users++)
231 return 0;
232
233 error = svc_bind(serv, net);
234 if (error)
235 goto err_bind;
236
237 error = make_socks(serv, net, cred);
238 if (error < 0)
239 goto err_bind;
240 set_grace_period(net);
241 dprintk("%s: per-net data created; net=%x\n", __func__, net->ns.inum);
242 return 0;
243
244 err_bind:
245 ln->nlmsvc_users--;
246 return error;
247 }
248
lockd_down_net(struct svc_serv * serv,struct net * net)249 static void lockd_down_net(struct svc_serv *serv, struct net *net)
250 {
251 struct lockd_net *ln = net_generic(net, lockd_net_id);
252
253 if (ln->nlmsvc_users) {
254 if (--ln->nlmsvc_users == 0) {
255 nlm_shutdown_hosts_net(net);
256 cancel_delayed_work_sync(&ln->grace_period_end);
257 locks_end_grace(&ln->lockd_manager);
258 svc_xprt_destroy_all(serv, net);
259 svc_rpcb_cleanup(serv, net);
260 }
261 } else {
262 pr_err("%s: no users! net=%x\n",
263 __func__, net->ns.inum);
264 BUG();
265 }
266 }
267
lockd_inetaddr_event(struct notifier_block * this,unsigned long event,void * ptr)268 static int lockd_inetaddr_event(struct notifier_block *this,
269 unsigned long event, void *ptr)
270 {
271 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
272 struct sockaddr_in sin;
273
274 if (event != NETDEV_DOWN)
275 goto out;
276
277 if (nlmsvc_serv) {
278 dprintk("lockd_inetaddr_event: removed %pI4\n",
279 &ifa->ifa_local);
280 sin.sin_family = AF_INET;
281 sin.sin_addr.s_addr = ifa->ifa_local;
282 svc_age_temp_xprts_now(nlmsvc_serv, (struct sockaddr *)&sin);
283 }
284
285 out:
286 return NOTIFY_DONE;
287 }
288
289 static struct notifier_block lockd_inetaddr_notifier = {
290 .notifier_call = lockd_inetaddr_event,
291 };
292
293 #if IS_ENABLED(CONFIG_IPV6)
lockd_inet6addr_event(struct notifier_block * this,unsigned long event,void * ptr)294 static int lockd_inet6addr_event(struct notifier_block *this,
295 unsigned long event, void *ptr)
296 {
297 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
298 struct sockaddr_in6 sin6;
299
300 if (event != NETDEV_DOWN)
301 goto out;
302
303 if (nlmsvc_serv) {
304 dprintk("lockd_inet6addr_event: removed %pI6\n", &ifa->addr);
305 sin6.sin6_family = AF_INET6;
306 sin6.sin6_addr = ifa->addr;
307 if (ipv6_addr_type(&sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
308 sin6.sin6_scope_id = ifa->idev->dev->ifindex;
309 svc_age_temp_xprts_now(nlmsvc_serv, (struct sockaddr *)&sin6);
310 }
311
312 out:
313 return NOTIFY_DONE;
314 }
315
316 static struct notifier_block lockd_inet6addr_notifier = {
317 .notifier_call = lockd_inet6addr_event,
318 };
319 #endif
320
lockd_get(void)321 static int lockd_get(void)
322 {
323 struct svc_serv *serv;
324 int error;
325
326 if (nlmsvc_serv) {
327 nlmsvc_users++;
328 return 0;
329 }
330
331 /*
332 * Sanity check: if there's no pid,
333 * we should be the first user ...
334 */
335 if (nlmsvc_users)
336 printk(KERN_WARNING
337 "lockd_up: no pid, %d users??\n", nlmsvc_users);
338
339 serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, lockd);
340 if (!serv) {
341 printk(KERN_WARNING "lockd_up: create service failed\n");
342 return -ENOMEM;
343 }
344
345 error = svc_set_num_threads(serv, NULL, 1);
346 if (error < 0) {
347 svc_destroy(&serv);
348 return error;
349 }
350
351 nlmsvc_serv = serv;
352 register_inetaddr_notifier(&lockd_inetaddr_notifier);
353 #if IS_ENABLED(CONFIG_IPV6)
354 register_inet6addr_notifier(&lockd_inet6addr_notifier);
355 #endif
356 dprintk("lockd_up: service created\n");
357 nlmsvc_users++;
358 return 0;
359 }
360
lockd_put(void)361 static void lockd_put(void)
362 {
363 if (WARN(nlmsvc_users <= 0, "lockd_down: no users!\n"))
364 return;
365 if (--nlmsvc_users)
366 return;
367
368 unregister_inetaddr_notifier(&lockd_inetaddr_notifier);
369 #if IS_ENABLED(CONFIG_IPV6)
370 unregister_inet6addr_notifier(&lockd_inet6addr_notifier);
371 #endif
372
373 svc_set_num_threads(nlmsvc_serv, NULL, 0);
374 timer_delete_sync(&nlmsvc_retry);
375 svc_destroy(&nlmsvc_serv);
376 dprintk("lockd_down: service destroyed\n");
377 }
378
379 /*
380 * Bring up the lockd process if it's not already up.
381 */
lockd_up(struct net * net,const struct cred * cred)382 int lockd_up(struct net *net, const struct cred *cred)
383 {
384 int error;
385
386 mutex_lock(&nlmsvc_mutex);
387
388 error = lockd_get();
389 if (error)
390 goto err;
391
392 error = lockd_up_net(nlmsvc_serv, net, cred);
393 if (error < 0) {
394 lockd_put();
395 goto err;
396 }
397
398 err:
399 mutex_unlock(&nlmsvc_mutex);
400 return error;
401 }
402 EXPORT_SYMBOL_GPL(lockd_up);
403
404 /*
405 * Decrement the user count and bring down lockd if we're the last.
406 */
407 void
lockd_down(struct net * net)408 lockd_down(struct net *net)
409 {
410 mutex_lock(&nlmsvc_mutex);
411 lockd_down_net(nlmsvc_serv, net);
412 lockd_put();
413 mutex_unlock(&nlmsvc_mutex);
414 }
415 EXPORT_SYMBOL_GPL(lockd_down);
416
417 #ifdef CONFIG_SYSCTL
418
419 /*
420 * Sysctl parameters (same as module parameters, different interface).
421 */
422
423 static const struct ctl_table nlm_sysctls[] = {
424 {
425 .procname = "nlm_grace_period",
426 .data = &nlm_grace_period,
427 .maxlen = sizeof(unsigned long),
428 .mode = 0644,
429 .proc_handler = proc_doulongvec_minmax,
430 .extra1 = (unsigned long *) &nlm_grace_period_min,
431 .extra2 = (unsigned long *) &nlm_grace_period_max,
432 },
433 {
434 .procname = "nlm_timeout",
435 .data = &nlm_timeout,
436 .maxlen = sizeof(unsigned long),
437 .mode = 0644,
438 .proc_handler = proc_doulongvec_minmax,
439 .extra1 = (unsigned long *) &nlm_timeout_min,
440 .extra2 = (unsigned long *) &nlm_timeout_max,
441 },
442 {
443 .procname = "nlm_udpport",
444 .data = &nlm_udpport,
445 .maxlen = sizeof(int),
446 .mode = 0644,
447 .proc_handler = proc_dointvec_minmax,
448 .extra1 = (int *) &nlm_port_min,
449 .extra2 = (int *) &nlm_port_max,
450 },
451 {
452 .procname = "nlm_tcpport",
453 .data = &nlm_tcpport,
454 .maxlen = sizeof(int),
455 .mode = 0644,
456 .proc_handler = proc_dointvec_minmax,
457 .extra1 = (int *) &nlm_port_min,
458 .extra2 = (int *) &nlm_port_max,
459 },
460 {
461 .procname = "nsm_use_hostnames",
462 .data = &nsm_use_hostnames,
463 .maxlen = sizeof(bool),
464 .mode = 0644,
465 .proc_handler = proc_dobool,
466 },
467 {
468 .procname = "nsm_local_state",
469 .data = &nsm_local_state,
470 .maxlen = sizeof(nsm_local_state),
471 .mode = 0644,
472 .proc_handler = proc_douintvec,
473 .extra1 = SYSCTL_ZERO,
474 },
475 };
476
477 #endif /* CONFIG_SYSCTL */
478
479 /*
480 * Module (and sysfs) parameters.
481 */
482
483 #define param_set_min_max(name, type, which_strtol, min, max) \
484 static int param_set_##name(const char *val, const struct kernel_param *kp) \
485 { \
486 char *endp; \
487 __typeof__(type) num = which_strtol(val, &endp, 0); \
488 if (endp == val || *endp || num < (min) || num > (max)) \
489 return -EINVAL; \
490 *((type *) kp->arg) = num; \
491 return 0; \
492 }
493
is_callback(u32 proc)494 static inline int is_callback(u32 proc)
495 {
496 return proc == NLMPROC_GRANTED
497 || proc == NLMPROC_GRANTED_MSG
498 || proc == NLMPROC_TEST_RES
499 || proc == NLMPROC_LOCK_RES
500 || proc == NLMPROC_CANCEL_RES
501 || proc == NLMPROC_UNLOCK_RES
502 || proc == NLMPROC_NSM_NOTIFY;
503 }
504
505
lockd_authenticate(struct svc_rqst * rqstp)506 static enum svc_auth_status lockd_authenticate(struct svc_rqst *rqstp)
507 {
508 rqstp->rq_client = NULL;
509 switch (rqstp->rq_authop->flavour) {
510 case RPC_AUTH_NULL:
511 case RPC_AUTH_UNIX:
512 rqstp->rq_auth_stat = rpc_auth_ok;
513 if (rqstp->rq_proc == 0)
514 return SVC_OK;
515 if (is_callback(rqstp->rq_proc)) {
516 /* Leave it to individual procedures to
517 * call nlmsvc_lookup_host(rqstp)
518 */
519 return SVC_OK;
520 }
521 return svc_set_client(rqstp);
522 }
523 rqstp->rq_auth_stat = rpc_autherr_badcred;
524 return SVC_DENIED;
525 }
526
527
528 param_set_min_max(port, int, simple_strtol, 0, 65535)
529 param_set_min_max(grace_period, unsigned long, simple_strtoul,
530 nlm_grace_period_min, nlm_grace_period_max)
531 param_set_min_max(timeout, unsigned long, simple_strtoul,
532 nlm_timeout_min, nlm_timeout_max)
533
534 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
535 MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
536 MODULE_LICENSE("GPL");
537
538 module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
539 &nlm_grace_period, 0644);
540 module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
541 &nlm_timeout, 0644);
542 module_param_call(nlm_udpport, param_set_port, param_get_int,
543 &nlm_udpport, 0644);
544 module_param_call(nlm_tcpport, param_set_port, param_get_int,
545 &nlm_tcpport, 0644);
546 module_param(nsm_use_hostnames, bool, 0644);
547
lockd_init_net(struct net * net)548 static int lockd_init_net(struct net *net)
549 {
550 struct lockd_net *ln = net_generic(net, lockd_net_id);
551
552 INIT_DELAYED_WORK(&ln->grace_period_end, grace_ender);
553 INIT_LIST_HEAD(&ln->lockd_manager.list);
554 ln->lockd_manager.block_opens = false;
555 INIT_LIST_HEAD(&ln->nsm_handles);
556 return 0;
557 }
558
lockd_exit_net(struct net * net)559 static void lockd_exit_net(struct net *net)
560 {
561 struct lockd_net *ln = net_generic(net, lockd_net_id);
562
563 WARN_ONCE(!list_empty(&ln->lockd_manager.list),
564 "net %x %s: lockd_manager.list is not empty\n",
565 net->ns.inum, __func__);
566 WARN_ONCE(!list_empty(&ln->nsm_handles),
567 "net %x %s: nsm_handles list is not empty\n",
568 net->ns.inum, __func__);
569 WARN_ONCE(delayed_work_pending(&ln->grace_period_end),
570 "net %x %s: grace_period_end was not cancelled\n",
571 net->ns.inum, __func__);
572 }
573
574 static struct pernet_operations lockd_net_ops = {
575 .init = lockd_init_net,
576 .exit = lockd_exit_net,
577 .id = &lockd_net_id,
578 .size = sizeof(struct lockd_net),
579 };
580
581
582 /*
583 * Initialising and terminating the module.
584 */
585
init_nlm(void)586 static int __init init_nlm(void)
587 {
588 int err;
589
590 #ifdef CONFIG_SYSCTL
591 err = -ENOMEM;
592 nlm_sysctl_table = register_sysctl("fs/nfs", nlm_sysctls);
593 if (nlm_sysctl_table == NULL)
594 goto err_sysctl;
595 #endif
596 err = register_pernet_subsys(&lockd_net_ops);
597 if (err)
598 goto err_pernet;
599
600 err = genl_register_family(&lockd_nl_family);
601 if (err)
602 goto err_netlink;
603
604 err = lockd_create_procfs();
605 if (err)
606 goto err_procfs;
607
608 return 0;
609
610 err_procfs:
611 genl_unregister_family(&lockd_nl_family);
612 err_netlink:
613 unregister_pernet_subsys(&lockd_net_ops);
614 err_pernet:
615 #ifdef CONFIG_SYSCTL
616 unregister_sysctl_table(nlm_sysctl_table);
617 err_sysctl:
618 #endif
619 return err;
620 }
621
exit_nlm(void)622 static void __exit exit_nlm(void)
623 {
624 /* FIXME: delete all NLM clients */
625 nlm_shutdown_hosts();
626 genl_unregister_family(&lockd_nl_family);
627 lockd_remove_procfs();
628 unregister_pernet_subsys(&lockd_net_ops);
629 #ifdef CONFIG_SYSCTL
630 unregister_sysctl_table(nlm_sysctl_table);
631 #endif
632 }
633
634 module_init(init_nlm);
635 module_exit(exit_nlm);
636
637 /**
638 * nlmsvc_dispatch - Process an NLM Request
639 * @rqstp: incoming request
640 *
641 * Return values:
642 * %0: Processing complete; do not send a Reply
643 * %1: Processing complete; send Reply in rqstp->rq_res
644 */
nlmsvc_dispatch(struct svc_rqst * rqstp)645 static int nlmsvc_dispatch(struct svc_rqst *rqstp)
646 {
647 const struct svc_procedure *procp = rqstp->rq_procinfo;
648 __be32 *statp = rqstp->rq_accept_statp;
649
650 if (!procp->pc_decode(rqstp, &rqstp->rq_arg_stream))
651 goto out_decode_err;
652
653 *statp = procp->pc_func(rqstp);
654 if (*statp == rpc_drop_reply)
655 return 0;
656 if (*statp != rpc_success)
657 return 1;
658
659 if (!procp->pc_encode(rqstp, &rqstp->rq_res_stream))
660 goto out_encode_err;
661
662 return 1;
663
664 out_decode_err:
665 *statp = rpc_garbage_args;
666 return 1;
667
668 out_encode_err:
669 *statp = rpc_system_err;
670 return 1;
671 }
672
673 /*
674 * Define NLM program and procedures
675 */
676 static DEFINE_PER_CPU_ALIGNED(unsigned long, nlmsvc_version1_count[17]);
677 static const struct svc_version nlmsvc_version1 = {
678 .vs_vers = 1,
679 .vs_nproc = 17,
680 .vs_proc = nlmsvc_procedures,
681 .vs_count = nlmsvc_version1_count,
682 .vs_dispatch = nlmsvc_dispatch,
683 .vs_xdrsize = NLMSVC_XDRSIZE,
684 };
685
686 static DEFINE_PER_CPU_ALIGNED(unsigned long,
687 nlmsvc_version3_count[ARRAY_SIZE(nlmsvc_procedures)]);
688 static const struct svc_version nlmsvc_version3 = {
689 .vs_vers = 3,
690 .vs_nproc = ARRAY_SIZE(nlmsvc_procedures),
691 .vs_proc = nlmsvc_procedures,
692 .vs_count = nlmsvc_version3_count,
693 .vs_dispatch = nlmsvc_dispatch,
694 .vs_xdrsize = NLMSVC_XDRSIZE,
695 };
696
697 #ifdef CONFIG_LOCKD_V4
698 static DEFINE_PER_CPU_ALIGNED(unsigned long,
699 nlmsvc_version4_count[ARRAY_SIZE(nlmsvc_procedures4)]);
700 static const struct svc_version nlmsvc_version4 = {
701 .vs_vers = 4,
702 .vs_nproc = ARRAY_SIZE(nlmsvc_procedures4),
703 .vs_proc = nlmsvc_procedures4,
704 .vs_count = nlmsvc_version4_count,
705 .vs_dispatch = nlmsvc_dispatch,
706 .vs_xdrsize = NLMSVC_XDRSIZE,
707 };
708 #endif
709
710 static const struct svc_version *nlmsvc_version[] = {
711 [1] = &nlmsvc_version1,
712 [3] = &nlmsvc_version3,
713 #ifdef CONFIG_LOCKD_V4
714 [4] = &nlmsvc_version4,
715 #endif
716 };
717
718 #define NLM_NRVERS ARRAY_SIZE(nlmsvc_version)
719 static struct svc_program nlmsvc_program = {
720 .pg_prog = NLM_PROGRAM, /* program number */
721 .pg_nvers = NLM_NRVERS, /* number of entries in nlmsvc_version */
722 .pg_vers = nlmsvc_version, /* version table */
723 .pg_name = "lockd", /* service name */
724 .pg_class = "nfsd", /* share authentication with nfsd */
725 .pg_authenticate = &lockd_authenticate, /* export authentication */
726 .pg_init_request = svc_generic_init_request,
727 .pg_rpcbind_set = svc_generic_rpcbind_set,
728 };
729
730 /**
731 * lockd_nl_server_set_doit - set the lockd server parameters via netlink
732 * @skb: reply buffer
733 * @info: netlink metadata and command arguments
734 *
735 * This updates the per-net values. When updating the values in the init_net
736 * namespace, also update the "legacy" global values.
737 *
738 * Return 0 on success or a negative errno.
739 */
lockd_nl_server_set_doit(struct sk_buff * skb,struct genl_info * info)740 int lockd_nl_server_set_doit(struct sk_buff *skb, struct genl_info *info)
741 {
742 struct net *net = genl_info_net(info);
743 struct lockd_net *ln = net_generic(net, lockd_net_id);
744 const struct nlattr *attr;
745
746 if (GENL_REQ_ATTR_CHECK(info, LOCKD_A_SERVER_GRACETIME))
747 return -EINVAL;
748
749 if (info->attrs[LOCKD_A_SERVER_GRACETIME] ||
750 info->attrs[LOCKD_A_SERVER_TCP_PORT] ||
751 info->attrs[LOCKD_A_SERVER_UDP_PORT]) {
752 attr = info->attrs[LOCKD_A_SERVER_GRACETIME];
753 if (attr) {
754 u32 gracetime = nla_get_u32(attr);
755
756 if (gracetime > nlm_grace_period_max)
757 return -EINVAL;
758
759 ln->gracetime = gracetime;
760
761 if (net == &init_net)
762 nlm_grace_period = gracetime;
763 }
764
765 attr = info->attrs[LOCKD_A_SERVER_TCP_PORT];
766 if (attr) {
767 ln->tcp_port = nla_get_u16(attr);
768 if (net == &init_net)
769 nlm_tcpport = ln->tcp_port;
770 }
771
772 attr = info->attrs[LOCKD_A_SERVER_UDP_PORT];
773 if (attr) {
774 ln->udp_port = nla_get_u16(attr);
775 if (net == &init_net)
776 nlm_udpport = ln->udp_port;
777 }
778 }
779 return 0;
780 }
781
782 /**
783 * lockd_nl_server_get_doit - get lockd server parameters via netlink
784 * @skb: reply buffer
785 * @info: netlink metadata and command arguments
786 *
787 * Return 0 on success or a negative errno.
788 */
lockd_nl_server_get_doit(struct sk_buff * skb,struct genl_info * info)789 int lockd_nl_server_get_doit(struct sk_buff *skb, struct genl_info *info)
790 {
791 struct net *net = genl_info_net(info);
792 struct lockd_net *ln = net_generic(net, lockd_net_id);
793 void *hdr;
794 int err;
795
796 skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
797 if (!skb)
798 return -ENOMEM;
799
800 hdr = genlmsg_iput(skb, info);
801 if (!hdr) {
802 err = -EMSGSIZE;
803 goto err_free_msg;
804 }
805
806 err = nla_put_u32(skb, LOCKD_A_SERVER_GRACETIME, ln->gracetime) ||
807 nla_put_u16(skb, LOCKD_A_SERVER_TCP_PORT, ln->tcp_port) ||
808 nla_put_u16(skb, LOCKD_A_SERVER_UDP_PORT, ln->udp_port);
809 if (err)
810 goto err_free_msg;
811
812 genlmsg_end(skb, hdr);
813
814 return genlmsg_reply(skb, info);
815 err_free_msg:
816 nlmsg_free(skb);
817
818 return err;
819 }
820