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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/signal.h>
21#include <linux/errno.h>
22#include <linux/in.h>
23#include <linux/uio.h>
24#include <linux/smp.h>
25#include <linux/mutex.h>
26#include <linux/kthread.h>
27#include <linux/freezer.h>
28#include <linux/inetdevice.h>
29
30#include <linux/sunrpc/types.h>
31#include <linux/sunrpc/stats.h>
32#include <linux/sunrpc/clnt.h>
33#include <linux/sunrpc/svc.h>
34#include <linux/sunrpc/svcsock.h>
35#include <linux/sunrpc/svc_xprt.h>
36#include <net/ip.h>
37#include <net/addrconf.h>
38#include <net/ipv6.h>
39#include <linux/lockd/lockd.h>
40#include <linux/nfs.h>
41
42#include "netns.h"
43#include "procfs.h"
44
45#define NLMDBG_FACILITY NLMDBG_SVC
46#define LOCKD_BUFSIZE (1024 + NLMSVC_XDRSIZE)
47#define ALLOWED_SIGS (sigmask(SIGKILL))
48
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
60static atomic_t nlm_ntf_refcnt = ATOMIC_INIT(0);
61static DECLARE_WAIT_QUEUE_HEAD(nlm_ntf_wq);
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;
70static unsigned 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;
83static const int nlm_port_min = 0, nlm_port_max = 65535;
84
85#ifdef CONFIG_SYSCTL
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
117static void restart_grace(void)
118{
119 if (nlmsvc_ops) {
120 struct net *net = &init_net;
121 struct lockd_net *ln = net_generic(net, lockd_net_id);
122
123 cancel_delayed_work_sync(&ln->grace_period_end);
124 locks_end_grace(&ln->lockd_manager);
125 nlmsvc_invalidate_all();
126 set_grace_period(net);
127 }
128}
129
130/*
131 * This is the lockd kernel thread
132 */
133static int
134lockd(void *vrqstp)
135{
136 int err = 0;
137 struct svc_rqst *rqstp = vrqstp;
138 struct net *net = &init_net;
139 struct lockd_net *ln = net_generic(net, lockd_net_id);
140
141 /* try_to_freeze() is called from svc_recv() */
142 set_freezable();
143
144 /* Allow SIGKILL to tell lockd to drop all of its locks */
145 allow_signal(SIGKILL);
146
147 dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
148
149 /*
150 * The main request loop. We don't terminate until the last
151 * NFS mount or NFS daemon has gone away.
152 */
153 while (!kthread_should_stop()) {
154 long timeout = MAX_SCHEDULE_TIMEOUT;
155 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
156
157 /* update sv_maxconn if it has changed */
158 rqstp->rq_server->sv_maxconn = nlm_max_connections;
159
160 if (signalled()) {
161 flush_signals(current);
162 restart_grace();
163 continue;
164 }
165
166 timeout = nlmsvc_retry_blocked();
167
168 /*
169 * Find a socket with data available and call its
170 * recvfrom routine.
171 */
172 err = svc_recv(rqstp, timeout);
173 if (err == -EAGAIN || err == -EINTR)
174 continue;
175 dprintk("lockd: request from %s\n",
176 svc_print_addr(rqstp, buf, sizeof(buf)));
177
178 svc_process(rqstp);
179 }
180 flush_signals(current);
181 if (nlmsvc_ops)
182 nlmsvc_invalidate_all();
183 nlm_shutdown_hosts();
184 cancel_delayed_work_sync(&ln->grace_period_end);
185 locks_end_grace(&ln->lockd_manager);
186 return 0;
187}
188
189static int create_lockd_listener(struct svc_serv *serv, const char *name,
190 struct net *net, const int family,
191 const unsigned short port)
192{
193 struct svc_xprt *xprt;
194
195 xprt = svc_find_xprt(serv, name, net, family, 0);
196 if (xprt == NULL)
197 return svc_create_xprt(serv, name, net, family, port,
198 SVC_SOCK_DEFAULTS);
199 svc_xprt_put(xprt);
200 return 0;
201}
202
203static int create_lockd_family(struct svc_serv *serv, struct net *net,
204 const int family)
205{
206 int err;
207
208 err = create_lockd_listener(serv, "udp", net, family, nlm_udpport);
209 if (err < 0)
210 return err;
211
212 return create_lockd_listener(serv, "tcp", net, family, nlm_tcpport);
213}
214
215/*
216 * Ensure there are active UDP and TCP listeners for lockd.
217 *
218 * Even if we have only TCP NFS mounts and/or TCP NFSDs, some
219 * local services (such as rpc.statd) still require UDP, and
220 * some NFS servers do not yet support NLM over TCP.
221 *
222 * Returns zero if all listeners are available; otherwise a
223 * negative errno value is returned.
224 */
225static int make_socks(struct svc_serv *serv, struct net *net)
226{
227 static int warned;
228 int err;
229
230 err = create_lockd_family(serv, net, PF_INET);
231 if (err < 0)
232 goto out_err;
233
234 err = create_lockd_family(serv, net, PF_INET6);
235 if (err < 0 && err != -EAFNOSUPPORT)
236 goto out_err;
237
238 warned = 0;
239 return 0;
240
241out_err:
242 if (warned++ == 0)
243 printk(KERN_WARNING
244 "lockd_up: makesock failed, error=%d\n", err);
245 svc_shutdown_net(serv, net);
246 return err;
247}
248
249static int lockd_up_net(struct svc_serv *serv, struct net *net)
250{
251 struct lockd_net *ln = net_generic(net, lockd_net_id);
252 int error;
253
254 if (ln->nlmsvc_users++)
255 return 0;
256
257 error = svc_bind(serv, net);
258 if (error)
259 goto err_bind;
260
261 error = make_socks(serv, net);
262 if (error < 0)
263 goto err_bind;
264 set_grace_period(net);
265 dprintk("%s: per-net data created; net=%x\n", __func__, net->ns.inum);
266 return 0;
267
268err_bind:
269 ln->nlmsvc_users--;
270 return error;
271}
272
273static void lockd_down_net(struct svc_serv *serv, struct net *net)
274{
275 struct lockd_net *ln = net_generic(net, lockd_net_id);
276
277 if (ln->nlmsvc_users) {
278 if (--ln->nlmsvc_users == 0) {
279 nlm_shutdown_hosts_net(net);
280 cancel_delayed_work_sync(&ln->grace_period_end);
281 locks_end_grace(&ln->lockd_manager);
282 svc_shutdown_net(serv, net);
283 dprintk("%s: per-net data destroyed; net=%x\n",
284 __func__, net->ns.inum);
285 }
286 } else {
287 pr_err("%s: no users! task=%p, net=%x\n",
288 __func__, nlmsvc_task, net->ns.inum);
289 BUG();
290 }
291}
292
293static int lockd_inetaddr_event(struct notifier_block *this,
294 unsigned long event, void *ptr)
295{
296 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
297 struct sockaddr_in sin;
298
299 if ((event != NETDEV_DOWN) ||
300 !atomic_inc_not_zero(&nlm_ntf_refcnt))
301 goto out;
302
303 if (nlmsvc_rqst) {
304 dprintk("lockd_inetaddr_event: removed %pI4\n",
305 &ifa->ifa_local);
306 sin.sin_family = AF_INET;
307 sin.sin_addr.s_addr = ifa->ifa_local;
308 svc_age_temp_xprts_now(nlmsvc_rqst->rq_server,
309 (struct sockaddr *)&sin);
310 }
311 atomic_dec(&nlm_ntf_refcnt);
312 wake_up(&nlm_ntf_wq);
313
314out:
315 return NOTIFY_DONE;
316}
317
318static struct notifier_block lockd_inetaddr_notifier = {
319 .notifier_call = lockd_inetaddr_event,
320};
321
322#if IS_ENABLED(CONFIG_IPV6)
323static int lockd_inet6addr_event(struct notifier_block *this,
324 unsigned long event, void *ptr)
325{
326 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
327 struct sockaddr_in6 sin6;
328
329 if ((event != NETDEV_DOWN) ||
330 !atomic_inc_not_zero(&nlm_ntf_refcnt))
331 goto out;
332
333 if (nlmsvc_rqst) {
334 dprintk("lockd_inet6addr_event: removed %pI6\n", &ifa->addr);
335 sin6.sin6_family = AF_INET6;
336 sin6.sin6_addr = ifa->addr;
337 if (ipv6_addr_type(&sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
338 sin6.sin6_scope_id = ifa->idev->dev->ifindex;
339 svc_age_temp_xprts_now(nlmsvc_rqst->rq_server,
340 (struct sockaddr *)&sin6);
341 }
342 atomic_dec(&nlm_ntf_refcnt);
343 wake_up(&nlm_ntf_wq);
344
345out:
346 return NOTIFY_DONE;
347}
348
349static struct notifier_block lockd_inet6addr_notifier = {
350 .notifier_call = lockd_inet6addr_event,
351};
352#endif
353
354static void lockd_unregister_notifiers(void)
355{
356 unregister_inetaddr_notifier(&lockd_inetaddr_notifier);
357#if IS_ENABLED(CONFIG_IPV6)
358 unregister_inet6addr_notifier(&lockd_inet6addr_notifier);
359#endif
360 wait_event(nlm_ntf_wq, atomic_read(&nlm_ntf_refcnt) == 0);
361}
362
363static void lockd_svc_exit_thread(void)
364{
365 atomic_dec(&nlm_ntf_refcnt);
366 lockd_unregister_notifiers();
367 svc_exit_thread(nlmsvc_rqst);
368}
369
370static int lockd_start_svc(struct svc_serv *serv)
371{
372 int error;
373
374 if (nlmsvc_rqst)
375 return 0;
376
377 /*
378 * Create the kernel thread and wait for it to start.
379 */
380 nlmsvc_rqst = svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE);
381 if (IS_ERR(nlmsvc_rqst)) {
382 error = PTR_ERR(nlmsvc_rqst);
383 printk(KERN_WARNING
384 "lockd_up: svc_rqst allocation failed, error=%d\n",
385 error);
386 lockd_unregister_notifiers();
387 goto out_rqst;
388 }
389
390 atomic_inc(&nlm_ntf_refcnt);
391 svc_sock_update_bufs(serv);
392 serv->sv_maxconn = nlm_max_connections;
393
394 nlmsvc_task = kthread_create(lockd, nlmsvc_rqst, "%s", serv->sv_name);
395 if (IS_ERR(nlmsvc_task)) {
396 error = PTR_ERR(nlmsvc_task);
397 printk(KERN_WARNING
398 "lockd_up: kthread_run failed, error=%d\n", error);
399 goto out_task;
400 }
401 nlmsvc_rqst->rq_task = nlmsvc_task;
402 wake_up_process(nlmsvc_task);
403
404 dprintk("lockd_up: service started\n");
405 return 0;
406
407out_task:
408 lockd_svc_exit_thread();
409 nlmsvc_task = NULL;
410out_rqst:
411 nlmsvc_rqst = NULL;
412 return error;
413}
414
415static const struct svc_serv_ops lockd_sv_ops = {
416 .svo_shutdown = svc_rpcb_cleanup,
417 .svo_enqueue_xprt = svc_xprt_do_enqueue,
418};
419
420static struct svc_serv *lockd_create_svc(void)
421{
422 struct svc_serv *serv;
423
424 /*
425 * Check whether we're already up and running.
426 */
427 if (nlmsvc_rqst) {
428 /*
429 * Note: increase service usage, because later in case of error
430 * svc_destroy() will be called.
431 */
432 svc_get(nlmsvc_rqst->rq_server);
433 return nlmsvc_rqst->rq_server;
434 }
435
436 /*
437 * Sanity check: if there's no pid,
438 * we should be the first user ...
439 */
440 if (nlmsvc_users)
441 printk(KERN_WARNING
442 "lockd_up: no pid, %d users??\n", nlmsvc_users);
443
444 if (!nlm_timeout)
445 nlm_timeout = LOCKD_DFLT_TIMEO;
446 nlmsvc_timeout = nlm_timeout * HZ;
447
448 serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, &lockd_sv_ops);
449 if (!serv) {
450 printk(KERN_WARNING "lockd_up: create service failed\n");
451 return ERR_PTR(-ENOMEM);
452 }
453 register_inetaddr_notifier(&lockd_inetaddr_notifier);
454#if IS_ENABLED(CONFIG_IPV6)
455 register_inet6addr_notifier(&lockd_inet6addr_notifier);
456#endif
457 dprintk("lockd_up: service created\n");
458 return serv;
459}
460
461/*
462 * Bring up the lockd process if it's not already up.
463 */
464int lockd_up(struct net *net)
465{
466 struct svc_serv *serv;
467 int error;
468
469 mutex_lock(&nlmsvc_mutex);
470
471 serv = lockd_create_svc();
472 if (IS_ERR(serv)) {
473 error = PTR_ERR(serv);
474 goto err_create;
475 }
476
477 error = lockd_up_net(serv, net);
478 if (error < 0) {
479 lockd_unregister_notifiers();
480 goto err_put;
481 }
482
483 error = lockd_start_svc(serv);
484 if (error < 0) {
485 lockd_down_net(serv, net);
486 goto err_put;
487 }
488 nlmsvc_users++;
489 /*
490 * Note: svc_serv structures have an initial use count of 1,
491 * so we exit through here on both success and failure.
492 */
493err_put:
494 svc_destroy(serv);
495err_create:
496 mutex_unlock(&nlmsvc_mutex);
497 return error;
498}
499EXPORT_SYMBOL_GPL(lockd_up);
500
501/*
502 * Decrement the user count and bring down lockd if we're the last.
503 */
504void
505lockd_down(struct net *net)
506{
507 mutex_lock(&nlmsvc_mutex);
508 lockd_down_net(nlmsvc_rqst->rq_server, net);
509 if (nlmsvc_users) {
510 if (--nlmsvc_users)
511 goto out;
512 } else {
513 printk(KERN_ERR "lockd_down: no users! task=%p\n",
514 nlmsvc_task);
515 BUG();
516 }
517
518 if (!nlmsvc_task) {
519 printk(KERN_ERR "lockd_down: no lockd running.\n");
520 BUG();
521 }
522 kthread_stop(nlmsvc_task);
523 dprintk("lockd_down: service stopped\n");
524 lockd_svc_exit_thread();
525 dprintk("lockd_down: service destroyed\n");
526 nlmsvc_task = NULL;
527 nlmsvc_rqst = NULL;
528out:
529 mutex_unlock(&nlmsvc_mutex);
530}
531EXPORT_SYMBOL_GPL(lockd_down);
532
533#ifdef CONFIG_SYSCTL
534
535/*
536 * Sysctl parameters (same as module parameters, different interface).
537 */
538
539static struct ctl_table nlm_sysctls[] = {
540 {
541 .procname = "nlm_grace_period",
542 .data = &nlm_grace_period,
543 .maxlen = sizeof(unsigned long),
544 .mode = 0644,
545 .proc_handler = proc_doulongvec_minmax,
546 .extra1 = (unsigned long *) &nlm_grace_period_min,
547 .extra2 = (unsigned long *) &nlm_grace_period_max,
548 },
549 {
550 .procname = "nlm_timeout",
551 .data = &nlm_timeout,
552 .maxlen = sizeof(unsigned long),
553 .mode = 0644,
554 .proc_handler = proc_doulongvec_minmax,
555 .extra1 = (unsigned long *) &nlm_timeout_min,
556 .extra2 = (unsigned long *) &nlm_timeout_max,
557 },
558 {
559 .procname = "nlm_udpport",
560 .data = &nlm_udpport,
561 .maxlen = sizeof(int),
562 .mode = 0644,
563 .proc_handler = proc_dointvec_minmax,
564 .extra1 = (int *) &nlm_port_min,
565 .extra2 = (int *) &nlm_port_max,
566 },
567 {
568 .procname = "nlm_tcpport",
569 .data = &nlm_tcpport,
570 .maxlen = sizeof(int),
571 .mode = 0644,
572 .proc_handler = proc_dointvec_minmax,
573 .extra1 = (int *) &nlm_port_min,
574 .extra2 = (int *) &nlm_port_max,
575 },
576 {
577 .procname = "nsm_use_hostnames",
578 .data = &nsm_use_hostnames,
579 .maxlen = sizeof(int),
580 .mode = 0644,
581 .proc_handler = proc_dointvec,
582 },
583 {
584 .procname = "nsm_local_state",
585 .data = &nsm_local_state,
586 .maxlen = sizeof(int),
587 .mode = 0644,
588 .proc_handler = proc_dointvec,
589 },
590 { }
591};
592
593static struct ctl_table nlm_sysctl_dir[] = {
594 {
595 .procname = "nfs",
596 .mode = 0555,
597 .child = nlm_sysctls,
598 },
599 { }
600};
601
602static struct ctl_table nlm_sysctl_root[] = {
603 {
604 .procname = "fs",
605 .mode = 0555,
606 .child = nlm_sysctl_dir,
607 },
608 { }
609};
610
611#endif /* CONFIG_SYSCTL */
612
613/*
614 * Module (and sysfs) parameters.
615 */
616
617#define param_set_min_max(name, type, which_strtol, min, max) \
618static int param_set_##name(const char *val, const struct kernel_param *kp) \
619{ \
620 char *endp; \
621 __typeof__(type) num = which_strtol(val, &endp, 0); \
622 if (endp == val || *endp || num < (min) || num > (max)) \
623 return -EINVAL; \
624 *((type *) kp->arg) = num; \
625 return 0; \
626}
627
628static inline int is_callback(u32 proc)
629{
630 return proc == NLMPROC_GRANTED
631 || proc == NLMPROC_GRANTED_MSG
632 || proc == NLMPROC_TEST_RES
633 || proc == NLMPROC_LOCK_RES
634 || proc == NLMPROC_CANCEL_RES
635 || proc == NLMPROC_UNLOCK_RES
636 || proc == NLMPROC_NSM_NOTIFY;
637}
638
639
640static int lockd_authenticate(struct svc_rqst *rqstp)
641{
642 rqstp->rq_client = NULL;
643 switch (rqstp->rq_authop->flavour) {
644 case RPC_AUTH_NULL:
645 case RPC_AUTH_UNIX:
646 if (rqstp->rq_proc == 0)
647 return SVC_OK;
648 if (is_callback(rqstp->rq_proc)) {
649 /* Leave it to individual procedures to
650 * call nlmsvc_lookup_host(rqstp)
651 */
652 return SVC_OK;
653 }
654 return svc_set_client(rqstp);
655 }
656 return SVC_DENIED;
657}
658
659
660param_set_min_max(port, int, simple_strtol, 0, 65535)
661param_set_min_max(grace_period, unsigned long, simple_strtoul,
662 nlm_grace_period_min, nlm_grace_period_max)
663param_set_min_max(timeout, unsigned long, simple_strtoul,
664 nlm_timeout_min, nlm_timeout_max)
665
666MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
667MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
668MODULE_LICENSE("GPL");
669
670module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
671 &nlm_grace_period, 0644);
672module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
673 &nlm_timeout, 0644);
674module_param_call(nlm_udpport, param_set_port, param_get_int,
675 &nlm_udpport, 0644);
676module_param_call(nlm_tcpport, param_set_port, param_get_int,
677 &nlm_tcpport, 0644);
678module_param(nsm_use_hostnames, bool, 0644);
679module_param(nlm_max_connections, uint, 0644);
680
681static int lockd_init_net(struct net *net)
682{
683 struct lockd_net *ln = net_generic(net, lockd_net_id);
684
685 INIT_DELAYED_WORK(&ln->grace_period_end, grace_ender);
686 INIT_LIST_HEAD(&ln->lockd_manager.list);
687 ln->lockd_manager.block_opens = false;
688 INIT_LIST_HEAD(&ln->nsm_handles);
689 return 0;
690}
691
692static void lockd_exit_net(struct net *net)
693{
694 struct lockd_net *ln = net_generic(net, lockd_net_id);
695
696 WARN_ONCE(!list_empty(&ln->lockd_manager.list),
697 "net %x %s: lockd_manager.list is not empty\n",
698 net->ns.inum, __func__);
699 WARN_ONCE(!list_empty(&ln->nsm_handles),
700 "net %x %s: nsm_handles list is not empty\n",
701 net->ns.inum, __func__);
702 WARN_ONCE(delayed_work_pending(&ln->grace_period_end),
703 "net %x %s: grace_period_end was not cancelled\n",
704 net->ns.inum, __func__);
705}
706
707static struct pernet_operations lockd_net_ops = {
708 .init = lockd_init_net,
709 .exit = lockd_exit_net,
710 .id = &lockd_net_id,
711 .size = sizeof(struct lockd_net),
712};
713
714
715/*
716 * Initialising and terminating the module.
717 */
718
719static int __init init_nlm(void)
720{
721 int err;
722
723#ifdef CONFIG_SYSCTL
724 err = -ENOMEM;
725 nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
726 if (nlm_sysctl_table == NULL)
727 goto err_sysctl;
728#endif
729 err = register_pernet_subsys(&lockd_net_ops);
730 if (err)
731 goto err_pernet;
732
733 err = lockd_create_procfs();
734 if (err)
735 goto err_procfs;
736
737 return 0;
738
739err_procfs:
740 unregister_pernet_subsys(&lockd_net_ops);
741err_pernet:
742#ifdef CONFIG_SYSCTL
743 unregister_sysctl_table(nlm_sysctl_table);
744err_sysctl:
745#endif
746 return err;
747}
748
749static void __exit exit_nlm(void)
750{
751 /* FIXME: delete all NLM clients */
752 nlm_shutdown_hosts();
753 lockd_remove_procfs();
754 unregister_pernet_subsys(&lockd_net_ops);
755#ifdef CONFIG_SYSCTL
756 unregister_sysctl_table(nlm_sysctl_table);
757#endif
758}
759
760module_init(init_nlm);
761module_exit(exit_nlm);
762
763/*
764 * Define NLM program and procedures
765 */
766static unsigned int nlmsvc_version1_count[17];
767static const struct svc_version nlmsvc_version1 = {
768 .vs_vers = 1,
769 .vs_nproc = 17,
770 .vs_proc = nlmsvc_procedures,
771 .vs_count = nlmsvc_version1_count,
772 .vs_xdrsize = NLMSVC_XDRSIZE,
773};
774static unsigned int nlmsvc_version3_count[24];
775static const struct svc_version nlmsvc_version3 = {
776 .vs_vers = 3,
777 .vs_nproc = 24,
778 .vs_proc = nlmsvc_procedures,
779 .vs_count = nlmsvc_version3_count,
780 .vs_xdrsize = NLMSVC_XDRSIZE,
781};
782#ifdef CONFIG_LOCKD_V4
783static unsigned int nlmsvc_version4_count[24];
784static const struct svc_version nlmsvc_version4 = {
785 .vs_vers = 4,
786 .vs_nproc = 24,
787 .vs_proc = nlmsvc_procedures4,
788 .vs_count = nlmsvc_version4_count,
789 .vs_xdrsize = NLMSVC_XDRSIZE,
790};
791#endif
792static const struct svc_version *nlmsvc_version[] = {
793 [1] = &nlmsvc_version1,
794 [3] = &nlmsvc_version3,
795#ifdef CONFIG_LOCKD_V4
796 [4] = &nlmsvc_version4,
797#endif
798};
799
800static struct svc_stat nlmsvc_stats;
801
802#define NLM_NRVERS ARRAY_SIZE(nlmsvc_version)
803static struct svc_program nlmsvc_program = {
804 .pg_prog = NLM_PROGRAM, /* program number */
805 .pg_nvers = NLM_NRVERS, /* number of entries in nlmsvc_version */
806 .pg_vers = nlmsvc_version, /* version table */
807 .pg_name = "lockd", /* service name */
808 .pg_class = "nfsd", /* share authentication with nfsd */
809 .pg_stats = &nlmsvc_stats, /* stats table */
810 .pg_authenticate = &lockd_authenticate /* export authentication */
811};
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/kthread.h>
28#include <linux/freezer.h>
29#include <linux/inetdevice.h>
30
31#include <linux/sunrpc/types.h>
32#include <linux/sunrpc/stats.h>
33#include <linux/sunrpc/clnt.h>
34#include <linux/sunrpc/svc.h>
35#include <linux/sunrpc/svcsock.h>
36#include <linux/sunrpc/svc_xprt.h>
37#include <net/ip.h>
38#include <net/addrconf.h>
39#include <net/ipv6.h>
40#include <linux/lockd/lockd.h>
41#include <linux/nfs.h>
42
43#include "netns.h"
44#include "procfs.h"
45
46#define NLMDBG_FACILITY NLMDBG_SVC
47#define LOCKD_BUFSIZE (1024 + NLMSVC_XDRSIZE)
48#define ALLOWED_SIGS (sigmask(SIGKILL))
49
50static struct svc_program nlmsvc_program;
51
52const struct nlmsvc_binding *nlmsvc_ops;
53EXPORT_SYMBOL_GPL(nlmsvc_ops);
54
55static DEFINE_MUTEX(nlmsvc_mutex);
56static unsigned int nlmsvc_users;
57static struct svc_serv *nlmsvc_serv;
58unsigned long nlmsvc_timeout;
59
60unsigned int 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 struct net *net = &init_net;
136 struct lockd_net *ln = net_generic(net, lockd_net_id);
137
138 /* try_to_freeze() is called from svc_recv() */
139 set_freezable();
140
141 /* Allow SIGKILL to tell lockd to drop all of its locks */
142 allow_signal(SIGKILL);
143
144 dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
145
146 /*
147 * The main request loop. We don't terminate until the last
148 * NFS mount or NFS daemon has gone away.
149 */
150 while (!kthread_should_stop()) {
151 long timeout = MAX_SCHEDULE_TIMEOUT;
152 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
153
154 /* update sv_maxconn if it has changed */
155 rqstp->rq_server->sv_maxconn = nlm_max_connections;
156
157 if (signalled()) {
158 flush_signals(current);
159 restart_grace();
160 continue;
161 }
162
163 timeout = nlmsvc_retry_blocked();
164
165 /*
166 * Find a socket with data available and call its
167 * recvfrom routine.
168 */
169 err = svc_recv(rqstp, timeout);
170 if (err == -EAGAIN || err == -EINTR)
171 continue;
172 dprintk("lockd: request from %s\n",
173 svc_print_addr(rqstp, buf, sizeof(buf)));
174
175 svc_process(rqstp);
176 }
177 flush_signals(current);
178 if (nlmsvc_ops)
179 nlmsvc_invalidate_all();
180 nlm_shutdown_hosts();
181 cancel_delayed_work_sync(&ln->grace_period_end);
182 locks_end_grace(&ln->lockd_manager);
183
184 dprintk("lockd_down: service stopped\n");
185
186 svc_exit_thread(rqstp);
187 return 0;
188}
189
190static int create_lockd_listener(struct svc_serv *serv, const char *name,
191 struct net *net, const int family,
192 const unsigned short port,
193 const struct cred *cred)
194{
195 struct svc_xprt *xprt;
196
197 xprt = svc_find_xprt(serv, name, net, family, 0);
198 if (xprt == NULL)
199 return svc_xprt_create(serv, name, net, family, port,
200 SVC_SOCK_DEFAULTS, cred);
201 svc_xprt_put(xprt);
202 return 0;
203}
204
205static int create_lockd_family(struct svc_serv *serv, struct net *net,
206 const int family, const struct cred *cred)
207{
208 int err;
209
210 err = create_lockd_listener(serv, "udp", net, family, nlm_udpport,
211 cred);
212 if (err < 0)
213 return err;
214
215 return create_lockd_listener(serv, "tcp", net, family, nlm_tcpport,
216 cred);
217}
218
219/*
220 * Ensure there are active UDP and TCP listeners for lockd.
221 *
222 * Even if we have only TCP NFS mounts and/or TCP NFSDs, some
223 * local services (such as rpc.statd) still require UDP, and
224 * some NFS servers do not yet support NLM over TCP.
225 *
226 * Returns zero if all listeners are available; otherwise a
227 * negative errno value is returned.
228 */
229static int make_socks(struct svc_serv *serv, struct net *net,
230 const struct cred *cred)
231{
232 static int warned;
233 int err;
234
235 err = create_lockd_family(serv, net, PF_INET, cred);
236 if (err < 0)
237 goto out_err;
238
239 err = create_lockd_family(serv, net, PF_INET6, cred);
240 if (err < 0 && err != -EAFNOSUPPORT)
241 goto out_err;
242
243 warned = 0;
244 return 0;
245
246out_err:
247 if (warned++ == 0)
248 printk(KERN_WARNING
249 "lockd_up: makesock failed, error=%d\n", err);
250 svc_xprt_destroy_all(serv, net);
251 svc_rpcb_cleanup(serv, net);
252 return err;
253}
254
255static int lockd_up_net(struct svc_serv *serv, struct net *net,
256 const struct cred *cred)
257{
258 struct lockd_net *ln = net_generic(net, lockd_net_id);
259 int error;
260
261 if (ln->nlmsvc_users++)
262 return 0;
263
264 error = svc_bind(serv, net);
265 if (error)
266 goto err_bind;
267
268 error = make_socks(serv, net, cred);
269 if (error < 0)
270 goto err_bind;
271 set_grace_period(net);
272 dprintk("%s: per-net data created; net=%x\n", __func__, net->ns.inum);
273 return 0;
274
275err_bind:
276 ln->nlmsvc_users--;
277 return error;
278}
279
280static void lockd_down_net(struct svc_serv *serv, struct net *net)
281{
282 struct lockd_net *ln = net_generic(net, lockd_net_id);
283
284 if (ln->nlmsvc_users) {
285 if (--ln->nlmsvc_users == 0) {
286 nlm_shutdown_hosts_net(net);
287 cancel_delayed_work_sync(&ln->grace_period_end);
288 locks_end_grace(&ln->lockd_manager);
289 svc_xprt_destroy_all(serv, net);
290 svc_rpcb_cleanup(serv, net);
291 }
292 } else {
293 pr_err("%s: no users! net=%x\n",
294 __func__, net->ns.inum);
295 BUG();
296 }
297}
298
299static int lockd_inetaddr_event(struct notifier_block *this,
300 unsigned long event, void *ptr)
301{
302 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
303 struct sockaddr_in sin;
304
305 if (event != NETDEV_DOWN)
306 goto out;
307
308 if (nlmsvc_serv) {
309 dprintk("lockd_inetaddr_event: removed %pI4\n",
310 &ifa->ifa_local);
311 sin.sin_family = AF_INET;
312 sin.sin_addr.s_addr = ifa->ifa_local;
313 svc_age_temp_xprts_now(nlmsvc_serv, (struct sockaddr *)&sin);
314 }
315
316out:
317 return NOTIFY_DONE;
318}
319
320static struct notifier_block lockd_inetaddr_notifier = {
321 .notifier_call = lockd_inetaddr_event,
322};
323
324#if IS_ENABLED(CONFIG_IPV6)
325static int lockd_inet6addr_event(struct notifier_block *this,
326 unsigned long event, void *ptr)
327{
328 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
329 struct sockaddr_in6 sin6;
330
331 if (event != NETDEV_DOWN)
332 goto out;
333
334 if (nlmsvc_serv) {
335 dprintk("lockd_inet6addr_event: removed %pI6\n", &ifa->addr);
336 sin6.sin6_family = AF_INET6;
337 sin6.sin6_addr = ifa->addr;
338 if (ipv6_addr_type(&sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
339 sin6.sin6_scope_id = ifa->idev->dev->ifindex;
340 svc_age_temp_xprts_now(nlmsvc_serv, (struct sockaddr *)&sin6);
341 }
342
343out:
344 return NOTIFY_DONE;
345}
346
347static struct notifier_block lockd_inet6addr_notifier = {
348 .notifier_call = lockd_inet6addr_event,
349};
350#endif
351
352static int lockd_get(void)
353{
354 struct svc_serv *serv;
355 int error;
356
357 if (nlmsvc_serv) {
358 svc_get(nlmsvc_serv);
359 nlmsvc_users++;
360 return 0;
361 }
362
363 /*
364 * Sanity check: if there's no pid,
365 * we should be the first user ...
366 */
367 if (nlmsvc_users)
368 printk(KERN_WARNING
369 "lockd_up: no pid, %d users??\n", nlmsvc_users);
370
371 if (!nlm_timeout)
372 nlm_timeout = LOCKD_DFLT_TIMEO;
373 nlmsvc_timeout = nlm_timeout * HZ;
374
375 serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, lockd);
376 if (!serv) {
377 printk(KERN_WARNING "lockd_up: create service failed\n");
378 return -ENOMEM;
379 }
380
381 serv->sv_maxconn = nlm_max_connections;
382 error = svc_set_num_threads(serv, NULL, 1);
383 /* The thread now holds the only reference */
384 svc_put(serv);
385 if (error < 0)
386 return error;
387
388 nlmsvc_serv = serv;
389 register_inetaddr_notifier(&lockd_inetaddr_notifier);
390#if IS_ENABLED(CONFIG_IPV6)
391 register_inet6addr_notifier(&lockd_inet6addr_notifier);
392#endif
393 dprintk("lockd_up: service created\n");
394 nlmsvc_users++;
395 return 0;
396}
397
398static void lockd_put(void)
399{
400 if (WARN(nlmsvc_users <= 0, "lockd_down: no users!\n"))
401 return;
402 if (--nlmsvc_users)
403 return;
404
405 unregister_inetaddr_notifier(&lockd_inetaddr_notifier);
406#if IS_ENABLED(CONFIG_IPV6)
407 unregister_inet6addr_notifier(&lockd_inet6addr_notifier);
408#endif
409
410 svc_set_num_threads(nlmsvc_serv, NULL, 0);
411 nlmsvc_serv = NULL;
412 dprintk("lockd_down: service destroyed\n");
413}
414
415/*
416 * Bring up the lockd process if it's not already up.
417 */
418int lockd_up(struct net *net, const struct cred *cred)
419{
420 int error;
421
422 mutex_lock(&nlmsvc_mutex);
423
424 error = lockd_get();
425 if (error)
426 goto err;
427
428 error = lockd_up_net(nlmsvc_serv, net, cred);
429 if (error < 0) {
430 lockd_put();
431 goto err;
432 }
433
434err:
435 mutex_unlock(&nlmsvc_mutex);
436 return error;
437}
438EXPORT_SYMBOL_GPL(lockd_up);
439
440/*
441 * Decrement the user count and bring down lockd if we're the last.
442 */
443void
444lockd_down(struct net *net)
445{
446 mutex_lock(&nlmsvc_mutex);
447 lockd_down_net(nlmsvc_serv, net);
448 lockd_put();
449 mutex_unlock(&nlmsvc_mutex);
450}
451EXPORT_SYMBOL_GPL(lockd_down);
452
453#ifdef CONFIG_SYSCTL
454
455/*
456 * Sysctl parameters (same as module parameters, different interface).
457 */
458
459static struct ctl_table nlm_sysctls[] = {
460 {
461 .procname = "nlm_grace_period",
462 .data = &nlm_grace_period,
463 .maxlen = sizeof(unsigned long),
464 .mode = 0644,
465 .proc_handler = proc_doulongvec_minmax,
466 .extra1 = (unsigned long *) &nlm_grace_period_min,
467 .extra2 = (unsigned long *) &nlm_grace_period_max,
468 },
469 {
470 .procname = "nlm_timeout",
471 .data = &nlm_timeout,
472 .maxlen = sizeof(unsigned long),
473 .mode = 0644,
474 .proc_handler = proc_doulongvec_minmax,
475 .extra1 = (unsigned long *) &nlm_timeout_min,
476 .extra2 = (unsigned long *) &nlm_timeout_max,
477 },
478 {
479 .procname = "nlm_udpport",
480 .data = &nlm_udpport,
481 .maxlen = sizeof(int),
482 .mode = 0644,
483 .proc_handler = proc_dointvec_minmax,
484 .extra1 = (int *) &nlm_port_min,
485 .extra2 = (int *) &nlm_port_max,
486 },
487 {
488 .procname = "nlm_tcpport",
489 .data = &nlm_tcpport,
490 .maxlen = sizeof(int),
491 .mode = 0644,
492 .proc_handler = proc_dointvec_minmax,
493 .extra1 = (int *) &nlm_port_min,
494 .extra2 = (int *) &nlm_port_max,
495 },
496 {
497 .procname = "nsm_use_hostnames",
498 .data = &nsm_use_hostnames,
499 .maxlen = sizeof(int),
500 .mode = 0644,
501 .proc_handler = proc_dobool,
502 },
503 {
504 .procname = "nsm_local_state",
505 .data = &nsm_local_state,
506 .maxlen = sizeof(int),
507 .mode = 0644,
508 .proc_handler = proc_dointvec,
509 },
510 { }
511};
512
513static struct ctl_table nlm_sysctl_dir[] = {
514 {
515 .procname = "nfs",
516 .mode = 0555,
517 .child = nlm_sysctls,
518 },
519 { }
520};
521
522static struct ctl_table nlm_sysctl_root[] = {
523 {
524 .procname = "fs",
525 .mode = 0555,
526 .child = nlm_sysctl_dir,
527 },
528 { }
529};
530
531#endif /* CONFIG_SYSCTL */
532
533/*
534 * Module (and sysfs) parameters.
535 */
536
537#define param_set_min_max(name, type, which_strtol, min, max) \
538static int param_set_##name(const char *val, const struct kernel_param *kp) \
539{ \
540 char *endp; \
541 __typeof__(type) num = which_strtol(val, &endp, 0); \
542 if (endp == val || *endp || num < (min) || num > (max)) \
543 return -EINVAL; \
544 *((type *) kp->arg) = num; \
545 return 0; \
546}
547
548static inline int is_callback(u32 proc)
549{
550 return proc == NLMPROC_GRANTED
551 || proc == NLMPROC_GRANTED_MSG
552 || proc == NLMPROC_TEST_RES
553 || proc == NLMPROC_LOCK_RES
554 || proc == NLMPROC_CANCEL_RES
555 || proc == NLMPROC_UNLOCK_RES
556 || proc == NLMPROC_NSM_NOTIFY;
557}
558
559
560static int lockd_authenticate(struct svc_rqst *rqstp)
561{
562 rqstp->rq_client = NULL;
563 switch (rqstp->rq_authop->flavour) {
564 case RPC_AUTH_NULL:
565 case RPC_AUTH_UNIX:
566 rqstp->rq_auth_stat = rpc_auth_ok;
567 if (rqstp->rq_proc == 0)
568 return SVC_OK;
569 if (is_callback(rqstp->rq_proc)) {
570 /* Leave it to individual procedures to
571 * call nlmsvc_lookup_host(rqstp)
572 */
573 return SVC_OK;
574 }
575 return svc_set_client(rqstp);
576 }
577 rqstp->rq_auth_stat = rpc_autherr_badcred;
578 return SVC_DENIED;
579}
580
581
582param_set_min_max(port, int, simple_strtol, 0, 65535)
583param_set_min_max(grace_period, unsigned long, simple_strtoul,
584 nlm_grace_period_min, nlm_grace_period_max)
585param_set_min_max(timeout, unsigned long, simple_strtoul,
586 nlm_timeout_min, nlm_timeout_max)
587
588MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
589MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
590MODULE_LICENSE("GPL");
591
592module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
593 &nlm_grace_period, 0644);
594module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
595 &nlm_timeout, 0644);
596module_param_call(nlm_udpport, param_set_port, param_get_int,
597 &nlm_udpport, 0644);
598module_param_call(nlm_tcpport, param_set_port, param_get_int,
599 &nlm_tcpport, 0644);
600module_param(nsm_use_hostnames, bool, 0644);
601module_param(nlm_max_connections, uint, 0644);
602
603static int lockd_init_net(struct net *net)
604{
605 struct lockd_net *ln = net_generic(net, lockd_net_id);
606
607 INIT_DELAYED_WORK(&ln->grace_period_end, grace_ender);
608 INIT_LIST_HEAD(&ln->lockd_manager.list);
609 ln->lockd_manager.block_opens = false;
610 INIT_LIST_HEAD(&ln->nsm_handles);
611 return 0;
612}
613
614static void lockd_exit_net(struct net *net)
615{
616 struct lockd_net *ln = net_generic(net, lockd_net_id);
617
618 WARN_ONCE(!list_empty(&ln->lockd_manager.list),
619 "net %x %s: lockd_manager.list is not empty\n",
620 net->ns.inum, __func__);
621 WARN_ONCE(!list_empty(&ln->nsm_handles),
622 "net %x %s: nsm_handles list is not empty\n",
623 net->ns.inum, __func__);
624 WARN_ONCE(delayed_work_pending(&ln->grace_period_end),
625 "net %x %s: grace_period_end was not cancelled\n",
626 net->ns.inum, __func__);
627}
628
629static struct pernet_operations lockd_net_ops = {
630 .init = lockd_init_net,
631 .exit = lockd_exit_net,
632 .id = &lockd_net_id,
633 .size = sizeof(struct lockd_net),
634};
635
636
637/*
638 * Initialising and terminating the module.
639 */
640
641static int __init init_nlm(void)
642{
643 int err;
644
645#ifdef CONFIG_SYSCTL
646 err = -ENOMEM;
647 nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
648 if (nlm_sysctl_table == NULL)
649 goto err_sysctl;
650#endif
651 err = register_pernet_subsys(&lockd_net_ops);
652 if (err)
653 goto err_pernet;
654
655 err = lockd_create_procfs();
656 if (err)
657 goto err_procfs;
658
659 return 0;
660
661err_procfs:
662 unregister_pernet_subsys(&lockd_net_ops);
663err_pernet:
664#ifdef CONFIG_SYSCTL
665 unregister_sysctl_table(nlm_sysctl_table);
666err_sysctl:
667#endif
668 return err;
669}
670
671static void __exit exit_nlm(void)
672{
673 /* FIXME: delete all NLM clients */
674 nlm_shutdown_hosts();
675 lockd_remove_procfs();
676 unregister_pernet_subsys(&lockd_net_ops);
677#ifdef CONFIG_SYSCTL
678 unregister_sysctl_table(nlm_sysctl_table);
679#endif
680}
681
682module_init(init_nlm);
683module_exit(exit_nlm);
684
685/**
686 * nlmsvc_dispatch - Process an NLM Request
687 * @rqstp: incoming request
688 * @statp: pointer to location of accept_stat field in RPC Reply buffer
689 *
690 * Return values:
691 * %0: Processing complete; do not send a Reply
692 * %1: Processing complete; send Reply in rqstp->rq_res
693 */
694static int nlmsvc_dispatch(struct svc_rqst *rqstp, __be32 *statp)
695{
696 const struct svc_procedure *procp = rqstp->rq_procinfo;
697
698 svcxdr_init_decode(rqstp);
699 if (!procp->pc_decode(rqstp, &rqstp->rq_arg_stream))
700 goto out_decode_err;
701
702 *statp = procp->pc_func(rqstp);
703 if (*statp == rpc_drop_reply)
704 return 0;
705 if (*statp != rpc_success)
706 return 1;
707
708 svcxdr_init_encode(rqstp);
709 if (!procp->pc_encode(rqstp, &rqstp->rq_res_stream))
710 goto out_encode_err;
711
712 return 1;
713
714out_decode_err:
715 *statp = rpc_garbage_args;
716 return 1;
717
718out_encode_err:
719 *statp = rpc_system_err;
720 return 1;
721}
722
723/*
724 * Define NLM program and procedures
725 */
726static unsigned int nlmsvc_version1_count[17];
727static const struct svc_version nlmsvc_version1 = {
728 .vs_vers = 1,
729 .vs_nproc = 17,
730 .vs_proc = nlmsvc_procedures,
731 .vs_count = nlmsvc_version1_count,
732 .vs_dispatch = nlmsvc_dispatch,
733 .vs_xdrsize = NLMSVC_XDRSIZE,
734};
735static unsigned int nlmsvc_version3_count[24];
736static const struct svc_version nlmsvc_version3 = {
737 .vs_vers = 3,
738 .vs_nproc = 24,
739 .vs_proc = nlmsvc_procedures,
740 .vs_count = nlmsvc_version3_count,
741 .vs_dispatch = nlmsvc_dispatch,
742 .vs_xdrsize = NLMSVC_XDRSIZE,
743};
744#ifdef CONFIG_LOCKD_V4
745static unsigned int nlmsvc_version4_count[24];
746static const struct svc_version nlmsvc_version4 = {
747 .vs_vers = 4,
748 .vs_nproc = 24,
749 .vs_proc = nlmsvc_procedures4,
750 .vs_count = nlmsvc_version4_count,
751 .vs_dispatch = nlmsvc_dispatch,
752 .vs_xdrsize = NLMSVC_XDRSIZE,
753};
754#endif
755static const struct svc_version *nlmsvc_version[] = {
756 [1] = &nlmsvc_version1,
757 [3] = &nlmsvc_version3,
758#ifdef CONFIG_LOCKD_V4
759 [4] = &nlmsvc_version4,
760#endif
761};
762
763static struct svc_stat nlmsvc_stats;
764
765#define NLM_NRVERS ARRAY_SIZE(nlmsvc_version)
766static struct svc_program nlmsvc_program = {
767 .pg_prog = NLM_PROGRAM, /* program number */
768 .pg_nvers = NLM_NRVERS, /* number of entries in nlmsvc_version */
769 .pg_vers = nlmsvc_version, /* version table */
770 .pg_name = "lockd", /* service name */
771 .pg_class = "nfsd", /* share authentication with nfsd */
772 .pg_stats = &nlmsvc_stats, /* stats table */
773 .pg_authenticate = &lockd_authenticate, /* export authentication */
774 .pg_init_request = svc_generic_init_request,
775 .pg_rpcbind_set = svc_generic_rpcbind_set,
776};