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
49 static struct svc_program nlmsvc_program;
50
51 const struct nlmsvc_binding *nlmsvc_ops;
52 EXPORT_SYMBOL_GPL(nlmsvc_ops);
53
54 static DEFINE_MUTEX(nlmsvc_mutex);
55 static unsigned int nlmsvc_users;
56 static struct task_struct *nlmsvc_task;
57 static struct svc_rqst *nlmsvc_rqst;
58 unsigned long nlmsvc_timeout;
59
60 atomic_t nlm_ntf_refcnt = ATOMIC_INIT(0);
61 DECLARE_WAIT_QUEUE_HEAD(nlm_ntf_wq);
62
63 unsigned 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 */
69 static unsigned long nlm_grace_period;
70 static unsigned long nlm_timeout = LOCKD_DFLT_TIMEO;
71 static int nlm_udpport, nlm_tcpport;
72
73 /* RLIM_NOFILE defaults to 1024. That seems like a reasonable default here. */
74 static unsigned int nlm_max_connections = 1024;
75
76 /*
77 * Constants needed for the sysctl interface.
78 */
79 static const unsigned long nlm_grace_period_min = 0;
80 static const unsigned long nlm_grace_period_max = 240;
81 static const unsigned long nlm_timeout_min = 3;
82 static const unsigned long nlm_timeout_max = 20;
83 static const int nlm_port_min = 0, nlm_port_max = 65535;
84
85 #ifdef CONFIG_SYSCTL
86 static struct ctl_table_header * nlm_sysctl_table;
87 #endif
88
get_lockd_grace_period(void)89 static 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
grace_ender(struct work_struct * grace)98 static 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
set_grace_period(struct net * net)107 static 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
restart_grace(void)117 static 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 */
133 static int
lockd(void * vrqstp)134 lockd(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
create_lockd_listener(struct svc_serv * serv,const char * name,struct net * net,const int family,const unsigned short port)189 static 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
create_lockd_family(struct svc_serv * serv,struct net * net,const int family)203 static 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 */
make_socks(struct svc_serv * serv,struct net * net)225 static 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
241 out_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
lockd_up_net(struct svc_serv * serv,struct net * net)249 static 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("lockd_up_net: per-net data created; net=%p\n", net);
266 return 0;
267
268 err_bind:
269 ln->nlmsvc_users--;
270 return error;
271 }
272
lockd_down_net(struct svc_serv * serv,struct net * net)273 static 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("lockd_down_net: per-net data destroyed; net=%p\n", net);
284 }
285 } else {
286 printk(KERN_ERR "lockd_down_net: no users! task=%p, net=%p\n",
287 nlmsvc_task, net);
288 BUG();
289 }
290 }
291
lockd_inetaddr_event(struct notifier_block * this,unsigned long event,void * ptr)292 static int lockd_inetaddr_event(struct notifier_block *this,
293 unsigned long event, void *ptr)
294 {
295 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
296 struct sockaddr_in sin;
297
298 if ((event != NETDEV_DOWN) ||
299 !atomic_inc_not_zero(&nlm_ntf_refcnt))
300 goto out;
301
302 if (nlmsvc_rqst) {
303 dprintk("lockd_inetaddr_event: removed %pI4\n",
304 &ifa->ifa_local);
305 sin.sin_family = AF_INET;
306 sin.sin_addr.s_addr = ifa->ifa_local;
307 svc_age_temp_xprts_now(nlmsvc_rqst->rq_server,
308 (struct sockaddr *)&sin);
309 }
310 atomic_dec(&nlm_ntf_refcnt);
311 wake_up(&nlm_ntf_wq);
312
313 out:
314 return NOTIFY_DONE;
315 }
316
317 static struct notifier_block lockd_inetaddr_notifier = {
318 .notifier_call = lockd_inetaddr_event,
319 };
320
321 #if IS_ENABLED(CONFIG_IPV6)
lockd_inet6addr_event(struct notifier_block * this,unsigned long event,void * ptr)322 static int lockd_inet6addr_event(struct notifier_block *this,
323 unsigned long event, void *ptr)
324 {
325 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
326 struct sockaddr_in6 sin6;
327
328 if ((event != NETDEV_DOWN) ||
329 !atomic_inc_not_zero(&nlm_ntf_refcnt))
330 goto out;
331
332 if (nlmsvc_rqst) {
333 dprintk("lockd_inet6addr_event: removed %pI6\n", &ifa->addr);
334 sin6.sin6_family = AF_INET6;
335 sin6.sin6_addr = ifa->addr;
336 if (ipv6_addr_type(&sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
337 sin6.sin6_scope_id = ifa->idev->dev->ifindex;
338 svc_age_temp_xprts_now(nlmsvc_rqst->rq_server,
339 (struct sockaddr *)&sin6);
340 }
341 atomic_dec(&nlm_ntf_refcnt);
342 wake_up(&nlm_ntf_wq);
343
344 out:
345 return NOTIFY_DONE;
346 }
347
348 static struct notifier_block lockd_inet6addr_notifier = {
349 .notifier_call = lockd_inet6addr_event,
350 };
351 #endif
352
lockd_unregister_notifiers(void)353 static void lockd_unregister_notifiers(void)
354 {
355 unregister_inetaddr_notifier(&lockd_inetaddr_notifier);
356 #if IS_ENABLED(CONFIG_IPV6)
357 unregister_inet6addr_notifier(&lockd_inet6addr_notifier);
358 #endif
359 wait_event(nlm_ntf_wq, atomic_read(&nlm_ntf_refcnt) == 0);
360 }
361
lockd_svc_exit_thread(void)362 static void lockd_svc_exit_thread(void)
363 {
364 atomic_dec(&nlm_ntf_refcnt);
365 lockd_unregister_notifiers();
366 svc_exit_thread(nlmsvc_rqst);
367 }
368
lockd_start_svc(struct svc_serv * serv)369 static int lockd_start_svc(struct svc_serv *serv)
370 {
371 int error;
372
373 if (nlmsvc_rqst)
374 return 0;
375
376 /*
377 * Create the kernel thread and wait for it to start.
378 */
379 nlmsvc_rqst = svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE);
380 if (IS_ERR(nlmsvc_rqst)) {
381 error = PTR_ERR(nlmsvc_rqst);
382 printk(KERN_WARNING
383 "lockd_up: svc_rqst allocation failed, error=%d\n",
384 error);
385 lockd_unregister_notifiers();
386 goto out_rqst;
387 }
388
389 atomic_inc(&nlm_ntf_refcnt);
390 svc_sock_update_bufs(serv);
391 serv->sv_maxconn = nlm_max_connections;
392
393 nlmsvc_task = kthread_create(lockd, nlmsvc_rqst, "%s", serv->sv_name);
394 if (IS_ERR(nlmsvc_task)) {
395 error = PTR_ERR(nlmsvc_task);
396 printk(KERN_WARNING
397 "lockd_up: kthread_run failed, error=%d\n", error);
398 goto out_task;
399 }
400 nlmsvc_rqst->rq_task = nlmsvc_task;
401 wake_up_process(nlmsvc_task);
402
403 dprintk("lockd_up: service started\n");
404 return 0;
405
406 out_task:
407 lockd_svc_exit_thread();
408 nlmsvc_task = NULL;
409 out_rqst:
410 nlmsvc_rqst = NULL;
411 return error;
412 }
413
414 static const struct svc_serv_ops lockd_sv_ops = {
415 .svo_shutdown = svc_rpcb_cleanup,
416 .svo_enqueue_xprt = svc_xprt_do_enqueue,
417 };
418
lockd_create_svc(void)419 static struct svc_serv *lockd_create_svc(void)
420 {
421 struct svc_serv *serv;
422
423 /*
424 * Check whether we're already up and running.
425 */
426 if (nlmsvc_rqst) {
427 /*
428 * Note: increase service usage, because later in case of error
429 * svc_destroy() will be called.
430 */
431 svc_get(nlmsvc_rqst->rq_server);
432 return nlmsvc_rqst->rq_server;
433 }
434
435 /*
436 * Sanity check: if there's no pid,
437 * we should be the first user ...
438 */
439 if (nlmsvc_users)
440 printk(KERN_WARNING
441 "lockd_up: no pid, %d users??\n", nlmsvc_users);
442
443 if (!nlm_timeout)
444 nlm_timeout = LOCKD_DFLT_TIMEO;
445 nlmsvc_timeout = nlm_timeout * HZ;
446
447 serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, &lockd_sv_ops);
448 if (!serv) {
449 printk(KERN_WARNING "lockd_up: create service failed\n");
450 return ERR_PTR(-ENOMEM);
451 }
452 register_inetaddr_notifier(&lockd_inetaddr_notifier);
453 #if IS_ENABLED(CONFIG_IPV6)
454 register_inet6addr_notifier(&lockd_inet6addr_notifier);
455 #endif
456 dprintk("lockd_up: service created\n");
457 return serv;
458 }
459
460 /*
461 * Bring up the lockd process if it's not already up.
462 */
lockd_up(struct net * net)463 int lockd_up(struct net *net)
464 {
465 struct svc_serv *serv;
466 int error;
467
468 mutex_lock(&nlmsvc_mutex);
469
470 serv = lockd_create_svc();
471 if (IS_ERR(serv)) {
472 error = PTR_ERR(serv);
473 goto err_create;
474 }
475
476 error = lockd_up_net(serv, net);
477 if (error < 0) {
478 lockd_unregister_notifiers();
479 goto err_put;
480 }
481
482 error = lockd_start_svc(serv);
483 if (error < 0) {
484 lockd_down_net(serv, net);
485 goto err_put;
486 }
487 nlmsvc_users++;
488 /*
489 * Note: svc_serv structures have an initial use count of 1,
490 * so we exit through here on both success and failure.
491 */
492 err_put:
493 svc_destroy(serv);
494 err_create:
495 mutex_unlock(&nlmsvc_mutex);
496 return error;
497 }
498 EXPORT_SYMBOL_GPL(lockd_up);
499
500 /*
501 * Decrement the user count and bring down lockd if we're the last.
502 */
503 void
lockd_down(struct net * net)504 lockd_down(struct net *net)
505 {
506 mutex_lock(&nlmsvc_mutex);
507 lockd_down_net(nlmsvc_rqst->rq_server, net);
508 if (nlmsvc_users) {
509 if (--nlmsvc_users)
510 goto out;
511 } else {
512 printk(KERN_ERR "lockd_down: no users! task=%p\n",
513 nlmsvc_task);
514 BUG();
515 }
516
517 if (!nlmsvc_task) {
518 printk(KERN_ERR "lockd_down: no lockd running.\n");
519 BUG();
520 }
521 kthread_stop(nlmsvc_task);
522 dprintk("lockd_down: service stopped\n");
523 lockd_svc_exit_thread();
524 dprintk("lockd_down: service destroyed\n");
525 nlmsvc_task = NULL;
526 nlmsvc_rqst = NULL;
527 out:
528 mutex_unlock(&nlmsvc_mutex);
529 }
530 EXPORT_SYMBOL_GPL(lockd_down);
531
532 #ifdef CONFIG_SYSCTL
533
534 /*
535 * Sysctl parameters (same as module parameters, different interface).
536 */
537
538 static struct ctl_table nlm_sysctls[] = {
539 {
540 .procname = "nlm_grace_period",
541 .data = &nlm_grace_period,
542 .maxlen = sizeof(unsigned long),
543 .mode = 0644,
544 .proc_handler = proc_doulongvec_minmax,
545 .extra1 = (unsigned long *) &nlm_grace_period_min,
546 .extra2 = (unsigned long *) &nlm_grace_period_max,
547 },
548 {
549 .procname = "nlm_timeout",
550 .data = &nlm_timeout,
551 .maxlen = sizeof(unsigned long),
552 .mode = 0644,
553 .proc_handler = proc_doulongvec_minmax,
554 .extra1 = (unsigned long *) &nlm_timeout_min,
555 .extra2 = (unsigned long *) &nlm_timeout_max,
556 },
557 {
558 .procname = "nlm_udpport",
559 .data = &nlm_udpport,
560 .maxlen = sizeof(int),
561 .mode = 0644,
562 .proc_handler = proc_dointvec_minmax,
563 .extra1 = (int *) &nlm_port_min,
564 .extra2 = (int *) &nlm_port_max,
565 },
566 {
567 .procname = "nlm_tcpport",
568 .data = &nlm_tcpport,
569 .maxlen = sizeof(int),
570 .mode = 0644,
571 .proc_handler = proc_dointvec_minmax,
572 .extra1 = (int *) &nlm_port_min,
573 .extra2 = (int *) &nlm_port_max,
574 },
575 {
576 .procname = "nsm_use_hostnames",
577 .data = &nsm_use_hostnames,
578 .maxlen = sizeof(int),
579 .mode = 0644,
580 .proc_handler = proc_dointvec,
581 },
582 {
583 .procname = "nsm_local_state",
584 .data = &nsm_local_state,
585 .maxlen = sizeof(int),
586 .mode = 0644,
587 .proc_handler = proc_dointvec,
588 },
589 { }
590 };
591
592 static struct ctl_table nlm_sysctl_dir[] = {
593 {
594 .procname = "nfs",
595 .mode = 0555,
596 .child = nlm_sysctls,
597 },
598 { }
599 };
600
601 static struct ctl_table nlm_sysctl_root[] = {
602 {
603 .procname = "fs",
604 .mode = 0555,
605 .child = nlm_sysctl_dir,
606 },
607 { }
608 };
609
610 #endif /* CONFIG_SYSCTL */
611
612 /*
613 * Module (and sysfs) parameters.
614 */
615
616 #define param_set_min_max(name, type, which_strtol, min, max) \
617 static int param_set_##name(const char *val, const struct kernel_param *kp) \
618 { \
619 char *endp; \
620 __typeof__(type) num = which_strtol(val, &endp, 0); \
621 if (endp == val || *endp || num < (min) || num > (max)) \
622 return -EINVAL; \
623 *((type *) kp->arg) = num; \
624 return 0; \
625 }
626
is_callback(u32 proc)627 static inline int is_callback(u32 proc)
628 {
629 return proc == NLMPROC_GRANTED
630 || proc == NLMPROC_GRANTED_MSG
631 || proc == NLMPROC_TEST_RES
632 || proc == NLMPROC_LOCK_RES
633 || proc == NLMPROC_CANCEL_RES
634 || proc == NLMPROC_UNLOCK_RES
635 || proc == NLMPROC_NSM_NOTIFY;
636 }
637
638
lockd_authenticate(struct svc_rqst * rqstp)639 static int lockd_authenticate(struct svc_rqst *rqstp)
640 {
641 rqstp->rq_client = NULL;
642 switch (rqstp->rq_authop->flavour) {
643 case RPC_AUTH_NULL:
644 case RPC_AUTH_UNIX:
645 if (rqstp->rq_proc == 0)
646 return SVC_OK;
647 if (is_callback(rqstp->rq_proc)) {
648 /* Leave it to individual procedures to
649 * call nlmsvc_lookup_host(rqstp)
650 */
651 return SVC_OK;
652 }
653 return svc_set_client(rqstp);
654 }
655 return SVC_DENIED;
656 }
657
658
659 param_set_min_max(port, int, simple_strtol, 0, 65535)
660 param_set_min_max(grace_period, unsigned long, simple_strtoul,
661 nlm_grace_period_min, nlm_grace_period_max)
662 param_set_min_max(timeout, unsigned long, simple_strtoul,
663 nlm_timeout_min, nlm_timeout_max)
664
665 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
666 MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
667 MODULE_LICENSE("GPL");
668
669 module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
670 &nlm_grace_period, 0644);
671 module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
672 &nlm_timeout, 0644);
673 module_param_call(nlm_udpport, param_set_port, param_get_int,
674 &nlm_udpport, 0644);
675 module_param_call(nlm_tcpport, param_set_port, param_get_int,
676 &nlm_tcpport, 0644);
677 module_param(nsm_use_hostnames, bool, 0644);
678 module_param(nlm_max_connections, uint, 0644);
679
lockd_init_net(struct net * net)680 static int lockd_init_net(struct net *net)
681 {
682 struct lockd_net *ln = net_generic(net, lockd_net_id);
683
684 INIT_DELAYED_WORK(&ln->grace_period_end, grace_ender);
685 INIT_LIST_HEAD(&ln->lockd_manager.list);
686 ln->lockd_manager.block_opens = false;
687 INIT_LIST_HEAD(&ln->nsm_handles);
688 return 0;
689 }
690
lockd_exit_net(struct net * net)691 static void lockd_exit_net(struct net *net)
692 {
693 }
694
695 static struct pernet_operations lockd_net_ops = {
696 .init = lockd_init_net,
697 .exit = lockd_exit_net,
698 .id = &lockd_net_id,
699 .size = sizeof(struct lockd_net),
700 };
701
702
703 /*
704 * Initialising and terminating the module.
705 */
706
init_nlm(void)707 static int __init init_nlm(void)
708 {
709 int err;
710
711 #ifdef CONFIG_SYSCTL
712 err = -ENOMEM;
713 nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
714 if (nlm_sysctl_table == NULL)
715 goto err_sysctl;
716 #endif
717 err = register_pernet_subsys(&lockd_net_ops);
718 if (err)
719 goto err_pernet;
720
721 err = lockd_create_procfs();
722 if (err)
723 goto err_procfs;
724
725 return 0;
726
727 err_procfs:
728 unregister_pernet_subsys(&lockd_net_ops);
729 err_pernet:
730 #ifdef CONFIG_SYSCTL
731 unregister_sysctl_table(nlm_sysctl_table);
732 err_sysctl:
733 #endif
734 return err;
735 }
736
exit_nlm(void)737 static void __exit exit_nlm(void)
738 {
739 /* FIXME: delete all NLM clients */
740 nlm_shutdown_hosts();
741 lockd_remove_procfs();
742 unregister_pernet_subsys(&lockd_net_ops);
743 #ifdef CONFIG_SYSCTL
744 unregister_sysctl_table(nlm_sysctl_table);
745 #endif
746 }
747
748 module_init(init_nlm);
749 module_exit(exit_nlm);
750
751 /*
752 * Define NLM program and procedures
753 */
754 static unsigned int nlmsvc_version1_count[17];
755 static const struct svc_version nlmsvc_version1 = {
756 .vs_vers = 1,
757 .vs_nproc = 17,
758 .vs_proc = nlmsvc_procedures,
759 .vs_count = nlmsvc_version1_count,
760 .vs_xdrsize = NLMSVC_XDRSIZE,
761 };
762 static unsigned int nlmsvc_version3_count[24];
763 static const struct svc_version nlmsvc_version3 = {
764 .vs_vers = 3,
765 .vs_nproc = 24,
766 .vs_proc = nlmsvc_procedures,
767 .vs_count = nlmsvc_version3_count,
768 .vs_xdrsize = NLMSVC_XDRSIZE,
769 };
770 #ifdef CONFIG_LOCKD_V4
771 static unsigned int nlmsvc_version4_count[24];
772 static const struct svc_version nlmsvc_version4 = {
773 .vs_vers = 4,
774 .vs_nproc = 24,
775 .vs_proc = nlmsvc_procedures4,
776 .vs_count = nlmsvc_version4_count,
777 .vs_xdrsize = NLMSVC_XDRSIZE,
778 };
779 #endif
780 static const struct svc_version *nlmsvc_version[] = {
781 [1] = &nlmsvc_version1,
782 [3] = &nlmsvc_version3,
783 #ifdef CONFIG_LOCKD_V4
784 [4] = &nlmsvc_version4,
785 #endif
786 };
787
788 static struct svc_stat nlmsvc_stats;
789
790 #define NLM_NRVERS ARRAY_SIZE(nlmsvc_version)
791 static struct svc_program nlmsvc_program = {
792 .pg_prog = NLM_PROGRAM, /* program number */
793 .pg_nvers = NLM_NRVERS, /* number of entries in nlmsvc_version */
794 .pg_vers = nlmsvc_version, /* version table */
795 .pg_name = "lockd", /* service name */
796 .pg_class = "nfsd", /* share authentication with nfsd */
797 .pg_stats = &nlmsvc_stats, /* stats table */
798 .pg_authenticate = &lockd_authenticate /* export authentication */
799 };
800