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 task_struct	*nlmsvc_task;
 58static struct svc_rqst		*nlmsvc_rqst;
 59unsigned long			nlmsvc_timeout;
 60
 61static atomic_t nlm_ntf_refcnt = ATOMIC_INIT(0);
 62static DECLARE_WAIT_QUEUE_HEAD(nlm_ntf_wq);
 
 
 
 63
 64unsigned 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 */
 70static unsigned long		nlm_grace_period;
 71static unsigned long		nlm_timeout = LOCKD_DFLT_TIMEO;
 72static int			nlm_udpport, nlm_tcpport;
 73
 74/* RLIM_NOFILE defaults to 1024. That seems like a reasonable default here. */
 75static unsigned int		nlm_max_connections = 1024;
 76
 77/*
 78 * Constants needed for the sysctl interface.
 79 */
 80static const unsigned long	nlm_grace_period_min = 0;
 81static const unsigned long	nlm_grace_period_max = 240;
 82static const unsigned long	nlm_timeout_min = 3;
 83static const unsigned long	nlm_timeout_max = 20;
 84static const int		nlm_port_min = 0, nlm_port_max = 65535;
 85
 86#ifdef CONFIG_SYSCTL
 
 87static struct ctl_table_header * nlm_sysctl_table;
 88#endif
 89
 90static unsigned long get_lockd_grace_period(void)
 91{
 92	/* Note: nlm_timeout should always be nonzero */
 93	if (nlm_grace_period)
 94		return roundup(nlm_grace_period, nlm_timeout) * HZ;
 95	else
 96		return nlm_timeout * 5 * HZ;
 97}
 98
 99static void grace_ender(struct work_struct *grace)
100{
101	struct delayed_work *dwork = to_delayed_work(grace);
102	struct lockd_net *ln = container_of(dwork, struct lockd_net,
103					    grace_period_end);
104
105	locks_end_grace(&ln->lockd_manager);
106}
107
108static void set_grace_period(struct net *net)
109{
110	unsigned long grace_period = get_lockd_grace_period();
111	struct lockd_net *ln = net_generic(net, lockd_net_id);
112
113	locks_start_grace(net, &ln->lockd_manager);
114	cancel_delayed_work_sync(&ln->grace_period_end);
115	schedule_delayed_work(&ln->grace_period_end, grace_period);
116}
117
118static void restart_grace(void)
119{
120	if (nlmsvc_ops) {
121		struct net *net = &init_net;
122		struct lockd_net *ln = net_generic(net, lockd_net_id);
123
124		cancel_delayed_work_sync(&ln->grace_period_end);
125		locks_end_grace(&ln->lockd_manager);
126		nlmsvc_invalidate_all();
127		set_grace_period(net);
128	}
129}
130
131/*
132 * This is the lockd kernel thread
133 */
134static int
135lockd(void *vrqstp)
136{
137	int		err = 0;
138	struct svc_rqst *rqstp = vrqstp;
139	struct net *net = &init_net;
140	struct lockd_net *ln = net_generic(net, lockd_net_id);
141
142	/* try_to_freeze() is called from svc_recv() */
143	set_freezable();
144
145	/* Allow SIGKILL to tell lockd to drop all of its locks */
146	allow_signal(SIGKILL);
147
148	dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
149
150	/*
151	 * The main request loop. We don't terminate until the last
152	 * NFS mount or NFS daemon has gone away.
153	 */
154	while (!kthread_should_stop()) {
155		long timeout = MAX_SCHEDULE_TIMEOUT;
156		RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
157
158		/* update sv_maxconn if it has changed */
159		rqstp->rq_server->sv_maxconn = nlm_max_connections;
160
161		if (signalled()) {
162			flush_signals(current);
163			restart_grace();
164			continue;
165		}
166
167		timeout = nlmsvc_retry_blocked();
168
169		/*
170		 * Find a socket with data available and call its
171		 * recvfrom routine.
172		 */
173		err = svc_recv(rqstp, timeout);
174		if (err == -EAGAIN || err == -EINTR)
175			continue;
176		dprintk("lockd: request from %s\n",
177				svc_print_addr(rqstp, buf, sizeof(buf)));
178
179		svc_process(rqstp);
180	}
181	flush_signals(current);
182	if (nlmsvc_ops)
183		nlmsvc_invalidate_all();
184	nlm_shutdown_hosts();
185	cancel_delayed_work_sync(&ln->grace_period_end);
186	locks_end_grace(&ln->lockd_manager);
 
 
 
 
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_create_xprt(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_shutdown_net(serv, net);
 
251	return err;
252}
253
254static int lockd_up_net(struct svc_serv *serv, struct net *net,
255		const struct cred *cred)
256{
257	struct lockd_net *ln = net_generic(net, lockd_net_id);
258	int error;
259
260	if (ln->nlmsvc_users++)
261		return 0;
262
263	error = svc_bind(serv, net);
264	if (error)
265		goto err_bind;
266
267	error = make_socks(serv, net, cred);
268	if (error < 0)
269		goto err_bind;
270	set_grace_period(net);
271	dprintk("%s: per-net data created; net=%x\n", __func__, net->ns.inum);
272	return 0;
273
274err_bind:
275	ln->nlmsvc_users--;
276	return error;
277}
278
279static void lockd_down_net(struct svc_serv *serv, struct net *net)
280{
281	struct lockd_net *ln = net_generic(net, lockd_net_id);
282
283	if (ln->nlmsvc_users) {
284		if (--ln->nlmsvc_users == 0) {
285			nlm_shutdown_hosts_net(net);
286			cancel_delayed_work_sync(&ln->grace_period_end);
287			locks_end_grace(&ln->lockd_manager);
288			svc_shutdown_net(serv, net);
289			dprintk("%s: per-net data destroyed; net=%x\n",
290				__func__, net->ns.inum);
291		}
292	} else {
293		pr_err("%s: no users! task=%p, net=%x\n",
294			__func__, nlmsvc_task, 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	    !atomic_inc_not_zero(&nlm_ntf_refcnt))
307		goto out;
308
309	if (nlmsvc_rqst) {
310		dprintk("lockd_inetaddr_event: removed %pI4\n",
311			&ifa->ifa_local);
312		sin.sin_family = AF_INET;
313		sin.sin_addr.s_addr = ifa->ifa_local;
314		svc_age_temp_xprts_now(nlmsvc_rqst->rq_server,
315			(struct sockaddr *)&sin);
316	}
317	atomic_dec(&nlm_ntf_refcnt);
318	wake_up(&nlm_ntf_wq);
319
320out:
321	return NOTIFY_DONE;
322}
323
324static struct notifier_block lockd_inetaddr_notifier = {
325	.notifier_call = lockd_inetaddr_event,
326};
327
328#if IS_ENABLED(CONFIG_IPV6)
329static int lockd_inet6addr_event(struct notifier_block *this,
330	unsigned long event, void *ptr)
331{
332	struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
333	struct sockaddr_in6 sin6;
334
335	if ((event != NETDEV_DOWN) ||
336	    !atomic_inc_not_zero(&nlm_ntf_refcnt))
337		goto out;
338
339	if (nlmsvc_rqst) {
340		dprintk("lockd_inet6addr_event: removed %pI6\n", &ifa->addr);
341		sin6.sin6_family = AF_INET6;
342		sin6.sin6_addr = ifa->addr;
343		if (ipv6_addr_type(&sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
344			sin6.sin6_scope_id = ifa->idev->dev->ifindex;
345		svc_age_temp_xprts_now(nlmsvc_rqst->rq_server,
346			(struct sockaddr *)&sin6);
347	}
348	atomic_dec(&nlm_ntf_refcnt);
349	wake_up(&nlm_ntf_wq);
350
351out:
352	return NOTIFY_DONE;
353}
354
355static struct notifier_block lockd_inet6addr_notifier = {
356	.notifier_call = lockd_inet6addr_event,
357};
358#endif
359
360static void lockd_unregister_notifiers(void)
361{
362	unregister_inetaddr_notifier(&lockd_inetaddr_notifier);
363#if IS_ENABLED(CONFIG_IPV6)
364	unregister_inet6addr_notifier(&lockd_inet6addr_notifier);
365#endif
366	wait_event(nlm_ntf_wq, atomic_read(&nlm_ntf_refcnt) == 0);
367}
368
369static void lockd_svc_exit_thread(void)
370{
371	atomic_dec(&nlm_ntf_refcnt);
372	lockd_unregister_notifiers();
373	svc_exit_thread(nlmsvc_rqst);
374}
375
376static int lockd_start_svc(struct svc_serv *serv)
377{
 
378	int error;
379
380	if (nlmsvc_rqst)
 
381		return 0;
382
383	/*
384	 * Create the kernel thread and wait for it to start.
385	 */
386	nlmsvc_rqst = svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE);
387	if (IS_ERR(nlmsvc_rqst)) {
388		error = PTR_ERR(nlmsvc_rqst);
389		printk(KERN_WARNING
390			"lockd_up: svc_rqst allocation failed, error=%d\n",
391			error);
392		lockd_unregister_notifiers();
393		goto out_rqst;
394	}
395
396	atomic_inc(&nlm_ntf_refcnt);
397	svc_sock_update_bufs(serv);
398	serv->sv_maxconn = nlm_max_connections;
399
400	nlmsvc_task = kthread_create(lockd, nlmsvc_rqst, "%s", serv->sv_name);
401	if (IS_ERR(nlmsvc_task)) {
402		error = PTR_ERR(nlmsvc_task);
403		printk(KERN_WARNING
404			"lockd_up: kthread_run failed, error=%d\n", error);
405		goto out_task;
406	}
407	nlmsvc_rqst->rq_task = nlmsvc_task;
408	wake_up_process(nlmsvc_task);
409
410	dprintk("lockd_up: service started\n");
411	return 0;
412
413out_task:
414	lockd_svc_exit_thread();
415	nlmsvc_task = NULL;
416out_rqst:
417	nlmsvc_rqst = NULL;
418	return error;
419}
420
421static const struct svc_serv_ops lockd_sv_ops = {
422	.svo_shutdown		= svc_rpcb_cleanup,
423	.svo_enqueue_xprt	= svc_xprt_do_enqueue,
424};
425
426static struct svc_serv *lockd_create_svc(void)
427{
428	struct svc_serv *serv;
429
430	/*
431	 * Check whether we're already up and running.
432	 */
433	if (nlmsvc_rqst) {
434		/*
435		 * Note: increase service usage, because later in case of error
436		 * svc_destroy() will be called.
437		 */
438		svc_get(nlmsvc_rqst->rq_server);
439		return nlmsvc_rqst->rq_server;
440	}
441
442	/*
443	 * Sanity check: if there's no pid,
444	 * we should be the first user ...
445	 */
446	if (nlmsvc_users)
447		printk(KERN_WARNING
448			"lockd_up: no pid, %d users??\n", nlmsvc_users);
449
450	if (!nlm_timeout)
451		nlm_timeout = LOCKD_DFLT_TIMEO;
452	nlmsvc_timeout = nlm_timeout * HZ;
453
454	serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, &lockd_sv_ops);
455	if (!serv) {
456		printk(KERN_WARNING "lockd_up: create service failed\n");
457		return ERR_PTR(-ENOMEM);
458	}
 
 
 
 
 
 
 
 
 
459	register_inetaddr_notifier(&lockd_inetaddr_notifier);
460#if IS_ENABLED(CONFIG_IPV6)
461	register_inet6addr_notifier(&lockd_inet6addr_notifier);
462#endif
463	dprintk("lockd_up: service created\n");
464	return serv;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
465}
466
467/*
468 * Bring up the lockd process if it's not already up.
469 */
470int lockd_up(struct net *net, const struct cred *cred)
471{
472	struct svc_serv *serv;
473	int error;
474
475	mutex_lock(&nlmsvc_mutex);
476
477	serv = lockd_create_svc();
478	if (IS_ERR(serv)) {
479		error = PTR_ERR(serv);
480		goto err_create;
481	}
482
483	error = lockd_up_net(serv, net, cred);
484	if (error < 0) {
485		lockd_unregister_notifiers();
486		goto err_put;
487	}
488
489	error = lockd_start_svc(serv);
490	if (error < 0) {
491		lockd_down_net(serv, net);
492		goto err_put;
493	}
494	nlmsvc_users++;
495	/*
496	 * Note: svc_serv structures have an initial use count of 1,
497	 * so we exit through here on both success and failure.
498	 */
499err_put:
500	svc_destroy(serv);
501err_create:
502	mutex_unlock(&nlmsvc_mutex);
503	return error;
504}
505EXPORT_SYMBOL_GPL(lockd_up);
506
507/*
508 * Decrement the user count and bring down lockd if we're the last.
509 */
510void
511lockd_down(struct net *net)
512{
513	mutex_lock(&nlmsvc_mutex);
514	lockd_down_net(nlmsvc_rqst->rq_server, net);
515	if (nlmsvc_users) {
516		if (--nlmsvc_users)
517			goto out;
518	} else {
519		printk(KERN_ERR "lockd_down: no users! task=%p\n",
520			nlmsvc_task);
521		BUG();
522	}
523
524	if (!nlmsvc_task) {
525		printk(KERN_ERR "lockd_down: no lockd running.\n");
526		BUG();
527	}
528	kthread_stop(nlmsvc_task);
529	dprintk("lockd_down: service stopped\n");
530	lockd_svc_exit_thread();
531	dprintk("lockd_down: service destroyed\n");
532	nlmsvc_task = NULL;
533	nlmsvc_rqst = NULL;
534out:
535	mutex_unlock(&nlmsvc_mutex);
536}
537EXPORT_SYMBOL_GPL(lockd_down);
538
539#ifdef CONFIG_SYSCTL
540
541/*
542 * Sysctl parameters (same as module parameters, different interface).
543 */
544
545static struct ctl_table nlm_sysctls[] = {
546	{
547		.procname	= "nlm_grace_period",
548		.data		= &nlm_grace_period,
549		.maxlen		= sizeof(unsigned long),
550		.mode		= 0644,
551		.proc_handler	= proc_doulongvec_minmax,
552		.extra1		= (unsigned long *) &nlm_grace_period_min,
553		.extra2		= (unsigned long *) &nlm_grace_period_max,
554	},
555	{
556		.procname	= "nlm_timeout",
557		.data		= &nlm_timeout,
558		.maxlen		= sizeof(unsigned long),
559		.mode		= 0644,
560		.proc_handler	= proc_doulongvec_minmax,
561		.extra1		= (unsigned long *) &nlm_timeout_min,
562		.extra2		= (unsigned long *) &nlm_timeout_max,
563	},
564	{
565		.procname	= "nlm_udpport",
566		.data		= &nlm_udpport,
567		.maxlen		= sizeof(int),
568		.mode		= 0644,
569		.proc_handler	= proc_dointvec_minmax,
570		.extra1		= (int *) &nlm_port_min,
571		.extra2		= (int *) &nlm_port_max,
572	},
573	{
574		.procname	= "nlm_tcpport",
575		.data		= &nlm_tcpport,
576		.maxlen		= sizeof(int),
577		.mode		= 0644,
578		.proc_handler	= proc_dointvec_minmax,
579		.extra1		= (int *) &nlm_port_min,
580		.extra2		= (int *) &nlm_port_max,
581	},
582	{
583		.procname	= "nsm_use_hostnames",
584		.data		= &nsm_use_hostnames,
585		.maxlen		= sizeof(int),
586		.mode		= 0644,
587		.proc_handler	= proc_dointvec,
588	},
589	{
590		.procname	= "nsm_local_state",
591		.data		= &nsm_local_state,
592		.maxlen		= sizeof(int),
593		.mode		= 0644,
594		.proc_handler	= proc_dointvec,
595	},
596	{ }
597};
598
599static struct ctl_table nlm_sysctl_dir[] = {
600	{
601		.procname	= "nfs",
602		.mode		= 0555,
603		.child		= nlm_sysctls,
604	},
605	{ }
606};
607
608static struct ctl_table nlm_sysctl_root[] = {
609	{
610		.procname	= "fs",
611		.mode		= 0555,
612		.child		= nlm_sysctl_dir,
613	},
614	{ }
615};
616
617#endif	/* CONFIG_SYSCTL */
618
619/*
620 * Module (and sysfs) parameters.
621 */
622
623#define param_set_min_max(name, type, which_strtol, min, max)		\
624static int param_set_##name(const char *val, const struct kernel_param *kp) \
625{									\
626	char *endp;							\
627	__typeof__(type) num = which_strtol(val, &endp, 0);		\
628	if (endp == val || *endp || num < (min) || num > (max))		\
629		return -EINVAL;						\
630	*((type *) kp->arg) = num;					\
631	return 0;							\
632}
633
634static inline int is_callback(u32 proc)
635{
636	return proc == NLMPROC_GRANTED
637		|| proc == NLMPROC_GRANTED_MSG
638		|| proc == NLMPROC_TEST_RES
639		|| proc == NLMPROC_LOCK_RES
640		|| proc == NLMPROC_CANCEL_RES
641		|| proc == NLMPROC_UNLOCK_RES
642		|| proc == NLMPROC_NSM_NOTIFY;
643}
644
645
646static int lockd_authenticate(struct svc_rqst *rqstp)
647{
648	rqstp->rq_client = NULL;
649	switch (rqstp->rq_authop->flavour) {
650		case RPC_AUTH_NULL:
651		case RPC_AUTH_UNIX:
 
652			if (rqstp->rq_proc == 0)
653				return SVC_OK;
654			if (is_callback(rqstp->rq_proc)) {
655				/* Leave it to individual procedures to
656				 * call nlmsvc_lookup_host(rqstp)
657				 */
658				return SVC_OK;
659			}
660			return svc_set_client(rqstp);
661	}
 
662	return SVC_DENIED;
663}
664
665
666param_set_min_max(port, int, simple_strtol, 0, 65535)
667param_set_min_max(grace_period, unsigned long, simple_strtoul,
668		  nlm_grace_period_min, nlm_grace_period_max)
669param_set_min_max(timeout, unsigned long, simple_strtoul,
670		  nlm_timeout_min, nlm_timeout_max)
671
672MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
673MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
674MODULE_LICENSE("GPL");
675
676module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
677		  &nlm_grace_period, 0644);
678module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
679		  &nlm_timeout, 0644);
680module_param_call(nlm_udpport, param_set_port, param_get_int,
681		  &nlm_udpport, 0644);
682module_param_call(nlm_tcpport, param_set_port, param_get_int,
683		  &nlm_tcpport, 0644);
684module_param(nsm_use_hostnames, bool, 0644);
685module_param(nlm_max_connections, uint, 0644);
686
687static int lockd_init_net(struct net *net)
688{
689	struct lockd_net *ln = net_generic(net, lockd_net_id);
690
691	INIT_DELAYED_WORK(&ln->grace_period_end, grace_ender);
692	INIT_LIST_HEAD(&ln->lockd_manager.list);
693	ln->lockd_manager.block_opens = false;
694	INIT_LIST_HEAD(&ln->nsm_handles);
695	return 0;
696}
697
698static void lockd_exit_net(struct net *net)
699{
700	struct lockd_net *ln = net_generic(net, lockd_net_id);
701
702	WARN_ONCE(!list_empty(&ln->lockd_manager.list),
703		  "net %x %s: lockd_manager.list is not empty\n",
704		  net->ns.inum, __func__);
705	WARN_ONCE(!list_empty(&ln->nsm_handles),
706		  "net %x %s: nsm_handles list is not empty\n",
707		  net->ns.inum, __func__);
708	WARN_ONCE(delayed_work_pending(&ln->grace_period_end),
709		  "net %x %s: grace_period_end was not cancelled\n",
710		  net->ns.inum, __func__);
711}
712
713static struct pernet_operations lockd_net_ops = {
714	.init = lockd_init_net,
715	.exit = lockd_exit_net,
716	.id = &lockd_net_id,
717	.size = sizeof(struct lockd_net),
718};
719
720
721/*
722 * Initialising and terminating the module.
723 */
724
725static int __init init_nlm(void)
726{
727	int err;
728
729#ifdef CONFIG_SYSCTL
730	err = -ENOMEM;
731	nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
732	if (nlm_sysctl_table == NULL)
733		goto err_sysctl;
734#endif
735	err = register_pernet_subsys(&lockd_net_ops);
736	if (err)
737		goto err_pernet;
738
739	err = lockd_create_procfs();
740	if (err)
741		goto err_procfs;
742
743	return 0;
744
745err_procfs:
746	unregister_pernet_subsys(&lockd_net_ops);
747err_pernet:
748#ifdef CONFIG_SYSCTL
749	unregister_sysctl_table(nlm_sysctl_table);
750err_sysctl:
751#endif
752	return err;
753}
754
755static void __exit exit_nlm(void)
756{
757	/* FIXME: delete all NLM clients */
758	nlm_shutdown_hosts();
759	lockd_remove_procfs();
760	unregister_pernet_subsys(&lockd_net_ops);
761#ifdef CONFIG_SYSCTL
762	unregister_sysctl_table(nlm_sysctl_table);
763#endif
764}
765
766module_init(init_nlm);
767module_exit(exit_nlm);
768
769/**
770 * nlmsvc_dispatch - Process an NLM Request
771 * @rqstp: incoming request
772 * @statp: pointer to location of accept_stat field in RPC Reply buffer
773 *
774 * Return values:
775 *  %0: Processing complete; do not send a Reply
776 *  %1: Processing complete; send Reply in rqstp->rq_res
777 */
778static int nlmsvc_dispatch(struct svc_rqst *rqstp, __be32 *statp)
779{
780	const struct svc_procedure *procp = rqstp->rq_procinfo;
781	struct kvec *argv = rqstp->rq_arg.head;
782	struct kvec *resv = rqstp->rq_res.head;
783
784	svcxdr_init_decode(rqstp);
785	if (!procp->pc_decode(rqstp, argv->iov_base))
786		goto out_decode_err;
787
788	*statp = procp->pc_func(rqstp);
789	if (*statp == rpc_drop_reply)
790		return 0;
791	if (*statp != rpc_success)
792		return 1;
793
794	svcxdr_init_encode(rqstp);
795	if (!procp->pc_encode(rqstp, resv->iov_base + resv->iov_len))
796		goto out_encode_err;
797
798	return 1;
799
800out_decode_err:
801	*statp = rpc_garbage_args;
802	return 1;
803
804out_encode_err:
805	*statp = rpc_system_err;
806	return 1;
807}
808
809/*
810 * Define NLM program and procedures
811 */
812static unsigned int nlmsvc_version1_count[17];
813static const struct svc_version	nlmsvc_version1 = {
814	.vs_vers	= 1,
815	.vs_nproc	= 17,
816	.vs_proc	= nlmsvc_procedures,
817	.vs_count	= nlmsvc_version1_count,
818	.vs_dispatch	= nlmsvc_dispatch,
819	.vs_xdrsize	= NLMSVC_XDRSIZE,
820};
821static unsigned int nlmsvc_version3_count[24];
 
 
822static const struct svc_version	nlmsvc_version3 = {
823	.vs_vers	= 3,
824	.vs_nproc	= 24,
825	.vs_proc	= nlmsvc_procedures,
826	.vs_count	= nlmsvc_version3_count,
827	.vs_dispatch	= nlmsvc_dispatch,
828	.vs_xdrsize	= NLMSVC_XDRSIZE,
829};
 
830#ifdef CONFIG_LOCKD_V4
831static unsigned int nlmsvc_version4_count[24];
 
832static const struct svc_version	nlmsvc_version4 = {
833	.vs_vers	= 4,
834	.vs_nproc	= 24,
835	.vs_proc	= nlmsvc_procedures4,
836	.vs_count	= nlmsvc_version4_count,
837	.vs_dispatch	= nlmsvc_dispatch,
838	.vs_xdrsize	= NLMSVC_XDRSIZE,
839};
840#endif
 
841static const struct svc_version *nlmsvc_version[] = {
842	[1] = &nlmsvc_version1,
843	[3] = &nlmsvc_version3,
844#ifdef CONFIG_LOCKD_V4
845	[4] = &nlmsvc_version4,
846#endif
847};
848
849static struct svc_stat		nlmsvc_stats;
850
851#define NLM_NRVERS	ARRAY_SIZE(nlmsvc_version)
852static struct svc_program	nlmsvc_program = {
853	.pg_prog		= NLM_PROGRAM,		/* program number */
854	.pg_nvers		= NLM_NRVERS,		/* number of entries in nlmsvc_version */
855	.pg_vers		= nlmsvc_version,	/* version table */
856	.pg_name		= "lockd",		/* service name */
857	.pg_class		= "nfsd",		/* share authentication with nfsd */
858	.pg_stats		= &nlmsvc_stats,	/* stats table */
859	.pg_authenticate	= &lockd_authenticate,	/* export authentication */
860	.pg_init_request	= svc_generic_init_request,
861	.pg_rpcbind_set		= svc_generic_rpcbind_set,
862};