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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.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
49static struct svc_program nlmsvc_program;
50
51const struct nlmsvc_binding *nlmsvc_ops;
52EXPORT_SYMBOL_GPL(nlmsvc_ops);
53
54static DEFINE_MUTEX(nlmsvc_mutex);
55static unsigned int nlmsvc_users;
56static struct task_struct *nlmsvc_task;
57static struct svc_rqst *nlmsvc_rqst;
58unsigned long nlmsvc_timeout;
59
60int lockd_net_id;
61
62/*
63 * These can be set at insmod time (useful for NFS as root filesystem),
64 * and also changed through the sysctl interface. -- Jamie Lokier, Aug 2003
65 */
66static unsigned long nlm_grace_period;
67static unsigned long nlm_timeout = LOCKD_DFLT_TIMEO;
68static int nlm_udpport, nlm_tcpport;
69
70/* RLIM_NOFILE defaults to 1024. That seems like a reasonable default here. */
71static unsigned int nlm_max_connections = 1024;
72
73/*
74 * Constants needed for the sysctl interface.
75 */
76static const unsigned long nlm_grace_period_min = 0;
77static const unsigned long nlm_grace_period_max = 240;
78static const unsigned long nlm_timeout_min = 3;
79static const unsigned long nlm_timeout_max = 20;
80static const int nlm_port_min = 0, nlm_port_max = 65535;
81
82#ifdef CONFIG_SYSCTL
83static struct ctl_table_header * nlm_sysctl_table;
84#endif
85
86static unsigned long get_lockd_grace_period(void)
87{
88 /* Note: nlm_timeout should always be nonzero */
89 if (nlm_grace_period)
90 return roundup(nlm_grace_period, nlm_timeout) * HZ;
91 else
92 return nlm_timeout * 5 * HZ;
93}
94
95static void grace_ender(struct work_struct *grace)
96{
97 struct delayed_work *dwork = to_delayed_work(grace);
98 struct lockd_net *ln = container_of(dwork, struct lockd_net,
99 grace_period_end);
100
101 locks_end_grace(&ln->lockd_manager);
102}
103
104static void set_grace_period(struct net *net)
105{
106 unsigned long grace_period = get_lockd_grace_period();
107 struct lockd_net *ln = net_generic(net, lockd_net_id);
108
109 locks_start_grace(net, &ln->lockd_manager);
110 cancel_delayed_work_sync(&ln->grace_period_end);
111 schedule_delayed_work(&ln->grace_period_end, grace_period);
112}
113
114static void restart_grace(void)
115{
116 if (nlmsvc_ops) {
117 struct net *net = &init_net;
118 struct lockd_net *ln = net_generic(net, lockd_net_id);
119
120 cancel_delayed_work_sync(&ln->grace_period_end);
121 locks_end_grace(&ln->lockd_manager);
122 nlmsvc_invalidate_all();
123 set_grace_period(net);
124 }
125}
126
127/*
128 * This is the lockd kernel thread
129 */
130static int
131lockd(void *vrqstp)
132{
133 int err = 0;
134 struct svc_rqst *rqstp = vrqstp;
135
136 /* try_to_freeze() is called from svc_recv() */
137 set_freezable();
138
139 /* Allow SIGKILL to tell lockd to drop all of its locks */
140 allow_signal(SIGKILL);
141
142 dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
143
144 /*
145 * The main request loop. We don't terminate until the last
146 * NFS mount or NFS daemon has gone away.
147 */
148 while (!kthread_should_stop()) {
149 long timeout = MAX_SCHEDULE_TIMEOUT;
150 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
151
152 /* update sv_maxconn if it has changed */
153 rqstp->rq_server->sv_maxconn = nlm_max_connections;
154
155 if (signalled()) {
156 flush_signals(current);
157 restart_grace();
158 continue;
159 }
160
161 timeout = nlmsvc_retry_blocked();
162
163 /*
164 * Find a socket with data available and call its
165 * recvfrom routine.
166 */
167 err = svc_recv(rqstp, timeout);
168 if (err == -EAGAIN || err == -EINTR)
169 continue;
170 dprintk("lockd: request from %s\n",
171 svc_print_addr(rqstp, buf, sizeof(buf)));
172
173 svc_process(rqstp);
174 }
175 flush_signals(current);
176 if (nlmsvc_ops)
177 nlmsvc_invalidate_all();
178 nlm_shutdown_hosts();
179 return 0;
180}
181
182static int create_lockd_listener(struct svc_serv *serv, const char *name,
183 struct net *net, const int family,
184 const unsigned short port)
185{
186 struct svc_xprt *xprt;
187
188 xprt = svc_find_xprt(serv, name, net, family, 0);
189 if (xprt == NULL)
190 return svc_create_xprt(serv, name, net, family, port,
191 SVC_SOCK_DEFAULTS);
192 svc_xprt_put(xprt);
193 return 0;
194}
195
196static int create_lockd_family(struct svc_serv *serv, struct net *net,
197 const int family)
198{
199 int err;
200
201 err = create_lockd_listener(serv, "udp", net, family, nlm_udpport);
202 if (err < 0)
203 return err;
204
205 return create_lockd_listener(serv, "tcp", net, family, nlm_tcpport);
206}
207
208/*
209 * Ensure there are active UDP and TCP listeners for lockd.
210 *
211 * Even if we have only TCP NFS mounts and/or TCP NFSDs, some
212 * local services (such as rpc.statd) still require UDP, and
213 * some NFS servers do not yet support NLM over TCP.
214 *
215 * Returns zero if all listeners are available; otherwise a
216 * negative errno value is returned.
217 */
218static int make_socks(struct svc_serv *serv, struct net *net)
219{
220 static int warned;
221 int err;
222
223 err = create_lockd_family(serv, net, PF_INET);
224 if (err < 0)
225 goto out_err;
226
227 err = create_lockd_family(serv, net, PF_INET6);
228 if (err < 0 && err != -EAFNOSUPPORT)
229 goto out_err;
230
231 warned = 0;
232 return 0;
233
234out_err:
235 if (warned++ == 0)
236 printk(KERN_WARNING
237 "lockd_up: makesock failed, error=%d\n", err);
238 svc_shutdown_net(serv, net);
239 return err;
240}
241
242static int lockd_up_net(struct svc_serv *serv, struct net *net)
243{
244 struct lockd_net *ln = net_generic(net, lockd_net_id);
245 int error;
246
247 if (ln->nlmsvc_users++)
248 return 0;
249
250 error = svc_bind(serv, net);
251 if (error)
252 goto err_bind;
253
254 error = make_socks(serv, net);
255 if (error < 0)
256 goto err_bind;
257 set_grace_period(net);
258 dprintk("lockd_up_net: per-net data created; net=%p\n", net);
259 return 0;
260
261err_bind:
262 ln->nlmsvc_users--;
263 return error;
264}
265
266static void lockd_down_net(struct svc_serv *serv, struct net *net)
267{
268 struct lockd_net *ln = net_generic(net, lockd_net_id);
269
270 if (ln->nlmsvc_users) {
271 if (--ln->nlmsvc_users == 0) {
272 nlm_shutdown_hosts_net(net);
273 cancel_delayed_work_sync(&ln->grace_period_end);
274 locks_end_grace(&ln->lockd_manager);
275 svc_shutdown_net(serv, net);
276 dprintk("lockd_down_net: per-net data destroyed; net=%p\n", net);
277 }
278 } else {
279 printk(KERN_ERR "lockd_down_net: no users! task=%p, net=%p\n",
280 nlmsvc_task, net);
281 BUG();
282 }
283}
284
285static int lockd_inetaddr_event(struct notifier_block *this,
286 unsigned long event, void *ptr)
287{
288 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
289 struct sockaddr_in sin;
290
291 if (event != NETDEV_DOWN)
292 goto out;
293
294 if (nlmsvc_rqst) {
295 dprintk("lockd_inetaddr_event: removed %pI4\n",
296 &ifa->ifa_local);
297 sin.sin_family = AF_INET;
298 sin.sin_addr.s_addr = ifa->ifa_local;
299 svc_age_temp_xprts_now(nlmsvc_rqst->rq_server,
300 (struct sockaddr *)&sin);
301 }
302
303out:
304 return NOTIFY_DONE;
305}
306
307static struct notifier_block lockd_inetaddr_notifier = {
308 .notifier_call = lockd_inetaddr_event,
309};
310
311#if IS_ENABLED(CONFIG_IPV6)
312static int lockd_inet6addr_event(struct notifier_block *this,
313 unsigned long event, void *ptr)
314{
315 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
316 struct sockaddr_in6 sin6;
317
318 if (event != NETDEV_DOWN)
319 goto out;
320
321 if (nlmsvc_rqst) {
322 dprintk("lockd_inet6addr_event: removed %pI6\n", &ifa->addr);
323 sin6.sin6_family = AF_INET6;
324 sin6.sin6_addr = ifa->addr;
325 svc_age_temp_xprts_now(nlmsvc_rqst->rq_server,
326 (struct sockaddr *)&sin6);
327 }
328
329out:
330 return NOTIFY_DONE;
331}
332
333static struct notifier_block lockd_inet6addr_notifier = {
334 .notifier_call = lockd_inet6addr_event,
335};
336#endif
337
338static void lockd_svc_exit_thread(void)
339{
340 unregister_inetaddr_notifier(&lockd_inetaddr_notifier);
341#if IS_ENABLED(CONFIG_IPV6)
342 unregister_inet6addr_notifier(&lockd_inet6addr_notifier);
343#endif
344 svc_exit_thread(nlmsvc_rqst);
345}
346
347static int lockd_start_svc(struct svc_serv *serv)
348{
349 int error;
350
351 if (nlmsvc_rqst)
352 return 0;
353
354 /*
355 * Create the kernel thread and wait for it to start.
356 */
357 nlmsvc_rqst = svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE);
358 if (IS_ERR(nlmsvc_rqst)) {
359 error = PTR_ERR(nlmsvc_rqst);
360 printk(KERN_WARNING
361 "lockd_up: svc_rqst allocation failed, error=%d\n",
362 error);
363 goto out_rqst;
364 }
365
366 svc_sock_update_bufs(serv);
367 serv->sv_maxconn = nlm_max_connections;
368
369 nlmsvc_task = kthread_create(lockd, nlmsvc_rqst, "%s", serv->sv_name);
370 if (IS_ERR(nlmsvc_task)) {
371 error = PTR_ERR(nlmsvc_task);
372 printk(KERN_WARNING
373 "lockd_up: kthread_run failed, error=%d\n", error);
374 goto out_task;
375 }
376 nlmsvc_rqst->rq_task = nlmsvc_task;
377 wake_up_process(nlmsvc_task);
378
379 dprintk("lockd_up: service started\n");
380 return 0;
381
382out_task:
383 lockd_svc_exit_thread();
384 nlmsvc_task = NULL;
385out_rqst:
386 nlmsvc_rqst = NULL;
387 return error;
388}
389
390static struct svc_serv_ops lockd_sv_ops = {
391 .svo_shutdown = svc_rpcb_cleanup,
392 .svo_enqueue_xprt = svc_xprt_do_enqueue,
393};
394
395static struct svc_serv *lockd_create_svc(void)
396{
397 struct svc_serv *serv;
398
399 /*
400 * Check whether we're already up and running.
401 */
402 if (nlmsvc_rqst) {
403 /*
404 * Note: increase service usage, because later in case of error
405 * svc_destroy() will be called.
406 */
407 svc_get(nlmsvc_rqst->rq_server);
408 return nlmsvc_rqst->rq_server;
409 }
410
411 /*
412 * Sanity check: if there's no pid,
413 * we should be the first user ...
414 */
415 if (nlmsvc_users)
416 printk(KERN_WARNING
417 "lockd_up: no pid, %d users??\n", nlmsvc_users);
418
419 if (!nlm_timeout)
420 nlm_timeout = LOCKD_DFLT_TIMEO;
421 nlmsvc_timeout = nlm_timeout * HZ;
422
423 serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, &lockd_sv_ops);
424 if (!serv) {
425 printk(KERN_WARNING "lockd_up: create service failed\n");
426 return ERR_PTR(-ENOMEM);
427 }
428 register_inetaddr_notifier(&lockd_inetaddr_notifier);
429#if IS_ENABLED(CONFIG_IPV6)
430 register_inet6addr_notifier(&lockd_inet6addr_notifier);
431#endif
432 dprintk("lockd_up: service created\n");
433 return serv;
434}
435
436/*
437 * Bring up the lockd process if it's not already up.
438 */
439int lockd_up(struct net *net)
440{
441 struct svc_serv *serv;
442 int error;
443
444 mutex_lock(&nlmsvc_mutex);
445
446 serv = lockd_create_svc();
447 if (IS_ERR(serv)) {
448 error = PTR_ERR(serv);
449 goto err_create;
450 }
451
452 error = lockd_up_net(serv, net);
453 if (error < 0)
454 goto err_net;
455
456 error = lockd_start_svc(serv);
457 if (error < 0)
458 goto err_start;
459
460 nlmsvc_users++;
461 /*
462 * Note: svc_serv structures have an initial use count of 1,
463 * so we exit through here on both success and failure.
464 */
465err_net:
466 svc_destroy(serv);
467err_create:
468 mutex_unlock(&nlmsvc_mutex);
469 return error;
470
471err_start:
472 lockd_down_net(serv, net);
473 goto err_net;
474}
475EXPORT_SYMBOL_GPL(lockd_up);
476
477/*
478 * Decrement the user count and bring down lockd if we're the last.
479 */
480void
481lockd_down(struct net *net)
482{
483 mutex_lock(&nlmsvc_mutex);
484 lockd_down_net(nlmsvc_rqst->rq_server, net);
485 if (nlmsvc_users) {
486 if (--nlmsvc_users)
487 goto out;
488 } else {
489 printk(KERN_ERR "lockd_down: no users! task=%p\n",
490 nlmsvc_task);
491 BUG();
492 }
493
494 if (!nlmsvc_task) {
495 printk(KERN_ERR "lockd_down: no lockd running.\n");
496 BUG();
497 }
498 kthread_stop(nlmsvc_task);
499 dprintk("lockd_down: service stopped\n");
500 lockd_svc_exit_thread();
501 dprintk("lockd_down: service destroyed\n");
502 nlmsvc_task = NULL;
503 nlmsvc_rqst = NULL;
504out:
505 mutex_unlock(&nlmsvc_mutex);
506}
507EXPORT_SYMBOL_GPL(lockd_down);
508
509#ifdef CONFIG_SYSCTL
510
511/*
512 * Sysctl parameters (same as module parameters, different interface).
513 */
514
515static struct ctl_table nlm_sysctls[] = {
516 {
517 .procname = "nlm_grace_period",
518 .data = &nlm_grace_period,
519 .maxlen = sizeof(unsigned long),
520 .mode = 0644,
521 .proc_handler = proc_doulongvec_minmax,
522 .extra1 = (unsigned long *) &nlm_grace_period_min,
523 .extra2 = (unsigned long *) &nlm_grace_period_max,
524 },
525 {
526 .procname = "nlm_timeout",
527 .data = &nlm_timeout,
528 .maxlen = sizeof(unsigned long),
529 .mode = 0644,
530 .proc_handler = proc_doulongvec_minmax,
531 .extra1 = (unsigned long *) &nlm_timeout_min,
532 .extra2 = (unsigned long *) &nlm_timeout_max,
533 },
534 {
535 .procname = "nlm_udpport",
536 .data = &nlm_udpport,
537 .maxlen = sizeof(int),
538 .mode = 0644,
539 .proc_handler = proc_dointvec_minmax,
540 .extra1 = (int *) &nlm_port_min,
541 .extra2 = (int *) &nlm_port_max,
542 },
543 {
544 .procname = "nlm_tcpport",
545 .data = &nlm_tcpport,
546 .maxlen = sizeof(int),
547 .mode = 0644,
548 .proc_handler = proc_dointvec_minmax,
549 .extra1 = (int *) &nlm_port_min,
550 .extra2 = (int *) &nlm_port_max,
551 },
552 {
553 .procname = "nsm_use_hostnames",
554 .data = &nsm_use_hostnames,
555 .maxlen = sizeof(int),
556 .mode = 0644,
557 .proc_handler = proc_dointvec,
558 },
559 {
560 .procname = "nsm_local_state",
561 .data = &nsm_local_state,
562 .maxlen = sizeof(int),
563 .mode = 0644,
564 .proc_handler = proc_dointvec,
565 },
566 { }
567};
568
569static struct ctl_table nlm_sysctl_dir[] = {
570 {
571 .procname = "nfs",
572 .mode = 0555,
573 .child = nlm_sysctls,
574 },
575 { }
576};
577
578static struct ctl_table nlm_sysctl_root[] = {
579 {
580 .procname = "fs",
581 .mode = 0555,
582 .child = nlm_sysctl_dir,
583 },
584 { }
585};
586
587#endif /* CONFIG_SYSCTL */
588
589/*
590 * Module (and sysfs) parameters.
591 */
592
593#define param_set_min_max(name, type, which_strtol, min, max) \
594static int param_set_##name(const char *val, struct kernel_param *kp) \
595{ \
596 char *endp; \
597 __typeof__(type) num = which_strtol(val, &endp, 0); \
598 if (endp == val || *endp || num < (min) || num > (max)) \
599 return -EINVAL; \
600 *((type *) kp->arg) = num; \
601 return 0; \
602}
603
604static inline int is_callback(u32 proc)
605{
606 return proc == NLMPROC_GRANTED
607 || proc == NLMPROC_GRANTED_MSG
608 || proc == NLMPROC_TEST_RES
609 || proc == NLMPROC_LOCK_RES
610 || proc == NLMPROC_CANCEL_RES
611 || proc == NLMPROC_UNLOCK_RES
612 || proc == NLMPROC_NSM_NOTIFY;
613}
614
615
616static int lockd_authenticate(struct svc_rqst *rqstp)
617{
618 rqstp->rq_client = NULL;
619 switch (rqstp->rq_authop->flavour) {
620 case RPC_AUTH_NULL:
621 case RPC_AUTH_UNIX:
622 if (rqstp->rq_proc == 0)
623 return SVC_OK;
624 if (is_callback(rqstp->rq_proc)) {
625 /* Leave it to individual procedures to
626 * call nlmsvc_lookup_host(rqstp)
627 */
628 return SVC_OK;
629 }
630 return svc_set_client(rqstp);
631 }
632 return SVC_DENIED;
633}
634
635
636param_set_min_max(port, int, simple_strtol, 0, 65535)
637param_set_min_max(grace_period, unsigned long, simple_strtoul,
638 nlm_grace_period_min, nlm_grace_period_max)
639param_set_min_max(timeout, unsigned long, simple_strtoul,
640 nlm_timeout_min, nlm_timeout_max)
641
642MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
643MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
644MODULE_LICENSE("GPL");
645
646module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
647 &nlm_grace_period, 0644);
648module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
649 &nlm_timeout, 0644);
650module_param_call(nlm_udpport, param_set_port, param_get_int,
651 &nlm_udpport, 0644);
652module_param_call(nlm_tcpport, param_set_port, param_get_int,
653 &nlm_tcpport, 0644);
654module_param(nsm_use_hostnames, bool, 0644);
655module_param(nlm_max_connections, uint, 0644);
656
657static int lockd_init_net(struct net *net)
658{
659 struct lockd_net *ln = net_generic(net, lockd_net_id);
660
661 INIT_DELAYED_WORK(&ln->grace_period_end, grace_ender);
662 INIT_LIST_HEAD(&ln->lockd_manager.list);
663 ln->lockd_manager.block_opens = false;
664 INIT_LIST_HEAD(&ln->nsm_handles);
665 return 0;
666}
667
668static void lockd_exit_net(struct net *net)
669{
670}
671
672static struct pernet_operations lockd_net_ops = {
673 .init = lockd_init_net,
674 .exit = lockd_exit_net,
675 .id = &lockd_net_id,
676 .size = sizeof(struct lockd_net),
677};
678
679
680/*
681 * Initialising and terminating the module.
682 */
683
684static int __init init_nlm(void)
685{
686 int err;
687
688#ifdef CONFIG_SYSCTL
689 err = -ENOMEM;
690 nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
691 if (nlm_sysctl_table == NULL)
692 goto err_sysctl;
693#endif
694 err = register_pernet_subsys(&lockd_net_ops);
695 if (err)
696 goto err_pernet;
697
698 err = lockd_create_procfs();
699 if (err)
700 goto err_procfs;
701
702 return 0;
703
704err_procfs:
705 unregister_pernet_subsys(&lockd_net_ops);
706err_pernet:
707#ifdef CONFIG_SYSCTL
708 unregister_sysctl_table(nlm_sysctl_table);
709err_sysctl:
710#endif
711 return err;
712}
713
714static void __exit exit_nlm(void)
715{
716 /* FIXME: delete all NLM clients */
717 nlm_shutdown_hosts();
718 lockd_remove_procfs();
719 unregister_pernet_subsys(&lockd_net_ops);
720#ifdef CONFIG_SYSCTL
721 unregister_sysctl_table(nlm_sysctl_table);
722#endif
723}
724
725module_init(init_nlm);
726module_exit(exit_nlm);
727
728/*
729 * Define NLM program and procedures
730 */
731static struct svc_version nlmsvc_version1 = {
732 .vs_vers = 1,
733 .vs_nproc = 17,
734 .vs_proc = nlmsvc_procedures,
735 .vs_xdrsize = NLMSVC_XDRSIZE,
736};
737static struct svc_version nlmsvc_version3 = {
738 .vs_vers = 3,
739 .vs_nproc = 24,
740 .vs_proc = nlmsvc_procedures,
741 .vs_xdrsize = NLMSVC_XDRSIZE,
742};
743#ifdef CONFIG_LOCKD_V4
744static struct svc_version nlmsvc_version4 = {
745 .vs_vers = 4,
746 .vs_nproc = 24,
747 .vs_proc = nlmsvc_procedures4,
748 .vs_xdrsize = NLMSVC_XDRSIZE,
749};
750#endif
751static struct svc_version * nlmsvc_version[] = {
752 [1] = &nlmsvc_version1,
753 [3] = &nlmsvc_version3,
754#ifdef CONFIG_LOCKD_V4
755 [4] = &nlmsvc_version4,
756#endif
757};
758
759static struct svc_stat nlmsvc_stats;
760
761#define NLM_NRVERS ARRAY_SIZE(nlmsvc_version)
762static struct svc_program nlmsvc_program = {
763 .pg_prog = NLM_PROGRAM, /* program number */
764 .pg_nvers = NLM_NRVERS, /* number of entries in nlmsvc_version */
765 .pg_vers = nlmsvc_version, /* version table */
766 .pg_name = "lockd", /* service name */
767 .pg_class = "nfsd", /* share authentication with nfsd */
768 .pg_stats = &nlmsvc_stats, /* stats table */
769 .pg_authenticate = &lockd_authenticate /* export authentication */
770};
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
45#define NLMDBG_FACILITY NLMDBG_SVC
46#define LOCKD_BUFSIZE (1024 + NLMSVC_XDRSIZE)
47
48static struct svc_program nlmsvc_program;
49
50const struct nlmsvc_binding *nlmsvc_ops;
51EXPORT_SYMBOL_GPL(nlmsvc_ops);
52
53static DEFINE_MUTEX(nlmsvc_mutex);
54static unsigned int nlmsvc_users;
55static struct svc_serv *nlmsvc_serv;
56
57static void nlmsvc_request_retry(struct timer_list *tl)
58{
59 svc_wake_up(nlmsvc_serv);
60}
61DEFINE_TIMER(nlmsvc_retry, nlmsvc_request_retry);
62
63unsigned 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 */
69static unsigned long nlm_grace_period;
70unsigned long nlm_timeout = LOCKD_DFLT_TIMEO;
71static int nlm_udpport, nlm_tcpport;
72
73/* RLIM_NOFILE defaults to 1024. That seems like a reasonable default here. */
74static unsigned int nlm_max_connections = 1024;
75
76/*
77 * Constants needed for the sysctl interface.
78 */
79static const unsigned long nlm_grace_period_min = 0;
80static const unsigned long nlm_grace_period_max = 240;
81static const unsigned long nlm_timeout_min = 3;
82static const unsigned long nlm_timeout_max = 20;
83
84#ifdef CONFIG_SYSCTL
85static const int nlm_port_min = 0, nlm_port_max = 65535;
86static struct ctl_table_header * nlm_sysctl_table;
87#endif
88
89static 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
98static 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
107static 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/*
118 * This is the lockd kernel thread
119 */
120static int
121lockd(void *vrqstp)
122{
123 struct svc_rqst *rqstp = vrqstp;
124 struct net *net = &init_net;
125 struct lockd_net *ln = net_generic(net, lockd_net_id);
126
127 svc_thread_init_status(rqstp, 0);
128
129 /* try_to_freeze() is called from svc_recv() */
130 set_freezable();
131
132 dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
133
134 /*
135 * The main request loop. We don't terminate until the last
136 * NFS mount or NFS daemon has gone away.
137 */
138 while (!svc_thread_should_stop(rqstp)) {
139 /* update sv_maxconn if it has changed */
140 rqstp->rq_server->sv_maxconn = nlm_max_connections;
141
142 nlmsvc_retry_blocked(rqstp);
143 svc_recv(rqstp);
144 }
145 if (nlmsvc_ops)
146 nlmsvc_invalidate_all();
147 nlm_shutdown_hosts();
148 cancel_delayed_work_sync(&ln->grace_period_end);
149 locks_end_grace(&ln->lockd_manager);
150
151 dprintk("lockd_down: service stopped\n");
152
153 svc_exit_thread(rqstp);
154 return 0;
155}
156
157static int create_lockd_listener(struct svc_serv *serv, const char *name,
158 struct net *net, const int family,
159 const unsigned short port,
160 const struct cred *cred)
161{
162 struct svc_xprt *xprt;
163
164 xprt = svc_find_xprt(serv, name, net, family, 0);
165 if (xprt == NULL)
166 return svc_xprt_create(serv, name, net, family, port,
167 SVC_SOCK_DEFAULTS, cred);
168 svc_xprt_put(xprt);
169 return 0;
170}
171
172static int create_lockd_family(struct svc_serv *serv, struct net *net,
173 const int family, const struct cred *cred)
174{
175 int err;
176
177 err = create_lockd_listener(serv, "udp", net, family, nlm_udpport,
178 cred);
179 if (err < 0)
180 return err;
181
182 return create_lockd_listener(serv, "tcp", net, family, nlm_tcpport,
183 cred);
184}
185
186/*
187 * Ensure there are active UDP and TCP listeners for lockd.
188 *
189 * Even if we have only TCP NFS mounts and/or TCP NFSDs, some
190 * local services (such as rpc.statd) still require UDP, and
191 * some NFS servers do not yet support NLM over TCP.
192 *
193 * Returns zero if all listeners are available; otherwise a
194 * negative errno value is returned.
195 */
196static int make_socks(struct svc_serv *serv, struct net *net,
197 const struct cred *cred)
198{
199 static int warned;
200 int err;
201
202 err = create_lockd_family(serv, net, PF_INET, cred);
203 if (err < 0)
204 goto out_err;
205
206 err = create_lockd_family(serv, net, PF_INET6, cred);
207 if (err < 0 && err != -EAFNOSUPPORT)
208 goto out_err;
209
210 warned = 0;
211 return 0;
212
213out_err:
214 if (warned++ == 0)
215 printk(KERN_WARNING
216 "lockd_up: makesock failed, error=%d\n", err);
217 svc_xprt_destroy_all(serv, net);
218 svc_rpcb_cleanup(serv, net);
219 return err;
220}
221
222static int lockd_up_net(struct svc_serv *serv, struct net *net,
223 const struct cred *cred)
224{
225 struct lockd_net *ln = net_generic(net, lockd_net_id);
226 int error;
227
228 if (ln->nlmsvc_users++)
229 return 0;
230
231 error = svc_bind(serv, net);
232 if (error)
233 goto err_bind;
234
235 error = make_socks(serv, net, cred);
236 if (error < 0)
237 goto err_bind;
238 set_grace_period(net);
239 dprintk("%s: per-net data created; net=%x\n", __func__, net->ns.inum);
240 return 0;
241
242err_bind:
243 ln->nlmsvc_users--;
244 return error;
245}
246
247static void lockd_down_net(struct svc_serv *serv, struct net *net)
248{
249 struct lockd_net *ln = net_generic(net, lockd_net_id);
250
251 if (ln->nlmsvc_users) {
252 if (--ln->nlmsvc_users == 0) {
253 nlm_shutdown_hosts_net(net);
254 cancel_delayed_work_sync(&ln->grace_period_end);
255 locks_end_grace(&ln->lockd_manager);
256 svc_xprt_destroy_all(serv, net);
257 svc_rpcb_cleanup(serv, net);
258 }
259 } else {
260 pr_err("%s: no users! net=%x\n",
261 __func__, net->ns.inum);
262 BUG();
263 }
264}
265
266static 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
283out:
284 return NOTIFY_DONE;
285}
286
287static struct notifier_block lockd_inetaddr_notifier = {
288 .notifier_call = lockd_inetaddr_event,
289};
290
291#if IS_ENABLED(CONFIG_IPV6)
292static 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
310out:
311 return NOTIFY_DONE;
312}
313
314static struct notifier_block lockd_inet6addr_notifier = {
315 .notifier_call = lockd_inet6addr_event,
316};
317#endif
318
319static 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 serv->sv_maxconn = nlm_max_connections;
344 error = svc_set_num_threads(serv, NULL, 1);
345 if (error < 0) {
346 svc_destroy(&serv);
347 return error;
348 }
349
350 nlmsvc_serv = serv;
351 register_inetaddr_notifier(&lockd_inetaddr_notifier);
352#if IS_ENABLED(CONFIG_IPV6)
353 register_inet6addr_notifier(&lockd_inet6addr_notifier);
354#endif
355 dprintk("lockd_up: service created\n");
356 nlmsvc_users++;
357 return 0;
358}
359
360static void lockd_put(void)
361{
362 if (WARN(nlmsvc_users <= 0, "lockd_down: no users!\n"))
363 return;
364 if (--nlmsvc_users)
365 return;
366
367 unregister_inetaddr_notifier(&lockd_inetaddr_notifier);
368#if IS_ENABLED(CONFIG_IPV6)
369 unregister_inet6addr_notifier(&lockd_inet6addr_notifier);
370#endif
371
372 svc_set_num_threads(nlmsvc_serv, NULL, 0);
373 timer_delete_sync(&nlmsvc_retry);
374 svc_destroy(&nlmsvc_serv);
375 dprintk("lockd_down: service destroyed\n");
376}
377
378/*
379 * Bring up the lockd process if it's not already up.
380 */
381int lockd_up(struct net *net, const struct cred *cred)
382{
383 int error;
384
385 mutex_lock(&nlmsvc_mutex);
386
387 error = lockd_get();
388 if (error)
389 goto err;
390
391 error = lockd_up_net(nlmsvc_serv, net, cred);
392 if (error < 0) {
393 lockd_put();
394 goto err;
395 }
396
397err:
398 mutex_unlock(&nlmsvc_mutex);
399 return error;
400}
401EXPORT_SYMBOL_GPL(lockd_up);
402
403/*
404 * Decrement the user count and bring down lockd if we're the last.
405 */
406void
407lockd_down(struct net *net)
408{
409 mutex_lock(&nlmsvc_mutex);
410 lockd_down_net(nlmsvc_serv, net);
411 lockd_put();
412 mutex_unlock(&nlmsvc_mutex);
413}
414EXPORT_SYMBOL_GPL(lockd_down);
415
416#ifdef CONFIG_SYSCTL
417
418/*
419 * Sysctl parameters (same as module parameters, different interface).
420 */
421
422static struct ctl_table nlm_sysctls[] = {
423 {
424 .procname = "nlm_grace_period",
425 .data = &nlm_grace_period,
426 .maxlen = sizeof(unsigned long),
427 .mode = 0644,
428 .proc_handler = proc_doulongvec_minmax,
429 .extra1 = (unsigned long *) &nlm_grace_period_min,
430 .extra2 = (unsigned long *) &nlm_grace_period_max,
431 },
432 {
433 .procname = "nlm_timeout",
434 .data = &nlm_timeout,
435 .maxlen = sizeof(unsigned long),
436 .mode = 0644,
437 .proc_handler = proc_doulongvec_minmax,
438 .extra1 = (unsigned long *) &nlm_timeout_min,
439 .extra2 = (unsigned long *) &nlm_timeout_max,
440 },
441 {
442 .procname = "nlm_udpport",
443 .data = &nlm_udpport,
444 .maxlen = sizeof(int),
445 .mode = 0644,
446 .proc_handler = proc_dointvec_minmax,
447 .extra1 = (int *) &nlm_port_min,
448 .extra2 = (int *) &nlm_port_max,
449 },
450 {
451 .procname = "nlm_tcpport",
452 .data = &nlm_tcpport,
453 .maxlen = sizeof(int),
454 .mode = 0644,
455 .proc_handler = proc_dointvec_minmax,
456 .extra1 = (int *) &nlm_port_min,
457 .extra2 = (int *) &nlm_port_max,
458 },
459 {
460 .procname = "nsm_use_hostnames",
461 .data = &nsm_use_hostnames,
462 .maxlen = sizeof(bool),
463 .mode = 0644,
464 .proc_handler = proc_dobool,
465 },
466 {
467 .procname = "nsm_local_state",
468 .data = &nsm_local_state,
469 .maxlen = sizeof(int),
470 .mode = 0644,
471 .proc_handler = proc_dointvec,
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) \
482static 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
492static 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
504static 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
526param_set_min_max(port, int, simple_strtol, 0, 65535)
527param_set_min_max(grace_period, unsigned long, simple_strtoul,
528 nlm_grace_period_min, nlm_grace_period_max)
529param_set_min_max(timeout, unsigned long, simple_strtoul,
530 nlm_timeout_min, nlm_timeout_max)
531
532MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
533MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
534MODULE_LICENSE("GPL");
535
536module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
537 &nlm_grace_period, 0644);
538module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
539 &nlm_timeout, 0644);
540module_param_call(nlm_udpport, param_set_port, param_get_int,
541 &nlm_udpport, 0644);
542module_param_call(nlm_tcpport, param_set_port, param_get_int,
543 &nlm_tcpport, 0644);
544module_param(nsm_use_hostnames, bool, 0644);
545module_param(nlm_max_connections, uint, 0644);
546
547static int lockd_init_net(struct net *net)
548{
549 struct lockd_net *ln = net_generic(net, lockd_net_id);
550
551 INIT_DELAYED_WORK(&ln->grace_period_end, grace_ender);
552 INIT_LIST_HEAD(&ln->lockd_manager.list);
553 ln->lockd_manager.block_opens = false;
554 INIT_LIST_HEAD(&ln->nsm_handles);
555 return 0;
556}
557
558static void lockd_exit_net(struct net *net)
559{
560 struct lockd_net *ln = net_generic(net, lockd_net_id);
561
562 WARN_ONCE(!list_empty(&ln->lockd_manager.list),
563 "net %x %s: lockd_manager.list is not empty\n",
564 net->ns.inum, __func__);
565 WARN_ONCE(!list_empty(&ln->nsm_handles),
566 "net %x %s: nsm_handles list is not empty\n",
567 net->ns.inum, __func__);
568 WARN_ONCE(delayed_work_pending(&ln->grace_period_end),
569 "net %x %s: grace_period_end was not cancelled\n",
570 net->ns.inum, __func__);
571}
572
573static struct pernet_operations lockd_net_ops = {
574 .init = lockd_init_net,
575 .exit = lockd_exit_net,
576 .id = &lockd_net_id,
577 .size = sizeof(struct lockd_net),
578};
579
580
581/*
582 * Initialising and terminating the module.
583 */
584
585static int __init init_nlm(void)
586{
587 int err;
588
589#ifdef CONFIG_SYSCTL
590 err = -ENOMEM;
591 nlm_sysctl_table = register_sysctl("fs/nfs", nlm_sysctls);
592 if (nlm_sysctl_table == NULL)
593 goto err_sysctl;
594#endif
595 err = register_pernet_subsys(&lockd_net_ops);
596 if (err)
597 goto err_pernet;
598
599 err = lockd_create_procfs();
600 if (err)
601 goto err_procfs;
602
603 return 0;
604
605err_procfs:
606 unregister_pernet_subsys(&lockd_net_ops);
607err_pernet:
608#ifdef CONFIG_SYSCTL
609 unregister_sysctl_table(nlm_sysctl_table);
610err_sysctl:
611#endif
612 return err;
613}
614
615static void __exit exit_nlm(void)
616{
617 /* FIXME: delete all NLM clients */
618 nlm_shutdown_hosts();
619 lockd_remove_procfs();
620 unregister_pernet_subsys(&lockd_net_ops);
621#ifdef CONFIG_SYSCTL
622 unregister_sysctl_table(nlm_sysctl_table);
623#endif
624}
625
626module_init(init_nlm);
627module_exit(exit_nlm);
628
629/**
630 * nlmsvc_dispatch - Process an NLM Request
631 * @rqstp: incoming request
632 *
633 * Return values:
634 * %0: Processing complete; do not send a Reply
635 * %1: Processing complete; send Reply in rqstp->rq_res
636 */
637static int nlmsvc_dispatch(struct svc_rqst *rqstp)
638{
639 const struct svc_procedure *procp = rqstp->rq_procinfo;
640 __be32 *statp = rqstp->rq_accept_statp;
641
642 if (!procp->pc_decode(rqstp, &rqstp->rq_arg_stream))
643 goto out_decode_err;
644
645 *statp = procp->pc_func(rqstp);
646 if (*statp == rpc_drop_reply)
647 return 0;
648 if (*statp != rpc_success)
649 return 1;
650
651 if (!procp->pc_encode(rqstp, &rqstp->rq_res_stream))
652 goto out_encode_err;
653
654 return 1;
655
656out_decode_err:
657 *statp = rpc_garbage_args;
658 return 1;
659
660out_encode_err:
661 *statp = rpc_system_err;
662 return 1;
663}
664
665/*
666 * Define NLM program and procedures
667 */
668static DEFINE_PER_CPU_ALIGNED(unsigned long, nlmsvc_version1_count[17]);
669static const struct svc_version nlmsvc_version1 = {
670 .vs_vers = 1,
671 .vs_nproc = 17,
672 .vs_proc = nlmsvc_procedures,
673 .vs_count = nlmsvc_version1_count,
674 .vs_dispatch = nlmsvc_dispatch,
675 .vs_xdrsize = NLMSVC_XDRSIZE,
676};
677
678static DEFINE_PER_CPU_ALIGNED(unsigned long,
679 nlmsvc_version3_count[ARRAY_SIZE(nlmsvc_procedures)]);
680static const struct svc_version nlmsvc_version3 = {
681 .vs_vers = 3,
682 .vs_nproc = ARRAY_SIZE(nlmsvc_procedures),
683 .vs_proc = nlmsvc_procedures,
684 .vs_count = nlmsvc_version3_count,
685 .vs_dispatch = nlmsvc_dispatch,
686 .vs_xdrsize = NLMSVC_XDRSIZE,
687};
688
689#ifdef CONFIG_LOCKD_V4
690static DEFINE_PER_CPU_ALIGNED(unsigned long,
691 nlmsvc_version4_count[ARRAY_SIZE(nlmsvc_procedures4)]);
692static const struct svc_version nlmsvc_version4 = {
693 .vs_vers = 4,
694 .vs_nproc = ARRAY_SIZE(nlmsvc_procedures4),
695 .vs_proc = nlmsvc_procedures4,
696 .vs_count = nlmsvc_version4_count,
697 .vs_dispatch = nlmsvc_dispatch,
698 .vs_xdrsize = NLMSVC_XDRSIZE,
699};
700#endif
701
702static const struct svc_version *nlmsvc_version[] = {
703 [1] = &nlmsvc_version1,
704 [3] = &nlmsvc_version3,
705#ifdef CONFIG_LOCKD_V4
706 [4] = &nlmsvc_version4,
707#endif
708};
709
710#define NLM_NRVERS ARRAY_SIZE(nlmsvc_version)
711static struct svc_program nlmsvc_program = {
712 .pg_prog = NLM_PROGRAM, /* program number */
713 .pg_nvers = NLM_NRVERS, /* number of entries in nlmsvc_version */
714 .pg_vers = nlmsvc_version, /* version table */
715 .pg_name = "lockd", /* service name */
716 .pg_class = "nfsd", /* share authentication with nfsd */
717 .pg_authenticate = &lockd_authenticate, /* export authentication */
718 .pg_init_request = svc_generic_init_request,
719 .pg_rpcbind_set = svc_generic_rpcbind_set,
720};