Loading...
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
29#include <linux/sunrpc/types.h>
30#include <linux/sunrpc/stats.h>
31#include <linux/sunrpc/clnt.h>
32#include <linux/sunrpc/svc.h>
33#include <linux/sunrpc/svcsock.h>
34#include <net/ip.h>
35#include <linux/lockd/lockd.h>
36#include <linux/nfs.h>
37
38#include "netns.h"
39
40#define NLMDBG_FACILITY NLMDBG_SVC
41#define LOCKD_BUFSIZE (1024 + NLMSVC_XDRSIZE)
42#define ALLOWED_SIGS (sigmask(SIGKILL))
43
44static struct svc_program nlmsvc_program;
45
46struct nlmsvc_binding * nlmsvc_ops;
47EXPORT_SYMBOL_GPL(nlmsvc_ops);
48
49static DEFINE_MUTEX(nlmsvc_mutex);
50static unsigned int nlmsvc_users;
51static struct task_struct *nlmsvc_task;
52static struct svc_rqst *nlmsvc_rqst;
53unsigned long nlmsvc_timeout;
54
55int lockd_net_id;
56
57/*
58 * These can be set at insmod time (useful for NFS as root filesystem),
59 * and also changed through the sysctl interface. -- Jamie Lokier, Aug 2003
60 */
61static unsigned long nlm_grace_period;
62static unsigned long nlm_timeout = LOCKD_DFLT_TIMEO;
63static int nlm_udpport, nlm_tcpport;
64
65/* RLIM_NOFILE defaults to 1024. That seems like a reasonable default here. */
66static unsigned int nlm_max_connections = 1024;
67
68/*
69 * Constants needed for the sysctl interface.
70 */
71static const unsigned long nlm_grace_period_min = 0;
72static const unsigned long nlm_grace_period_max = 240;
73static const unsigned long nlm_timeout_min = 3;
74static const unsigned long nlm_timeout_max = 20;
75static const int nlm_port_min = 0, nlm_port_max = 65535;
76
77#ifdef CONFIG_SYSCTL
78static struct ctl_table_header * nlm_sysctl_table;
79#endif
80
81static unsigned long get_lockd_grace_period(void)
82{
83 /* Note: nlm_timeout should always be nonzero */
84 if (nlm_grace_period)
85 return roundup(nlm_grace_period, nlm_timeout) * HZ;
86 else
87 return nlm_timeout * 5 * HZ;
88}
89
90static void grace_ender(struct work_struct *grace)
91{
92 struct delayed_work *dwork = container_of(grace, struct delayed_work,
93 work);
94 struct lockd_net *ln = container_of(dwork, struct lockd_net,
95 grace_period_end);
96
97 locks_end_grace(&ln->lockd_manager);
98}
99
100static void set_grace_period(struct net *net)
101{
102 unsigned long grace_period = get_lockd_grace_period();
103 struct lockd_net *ln = net_generic(net, lockd_net_id);
104
105 locks_start_grace(net, &ln->lockd_manager);
106 cancel_delayed_work_sync(&ln->grace_period_end);
107 schedule_delayed_work(&ln->grace_period_end, grace_period);
108}
109
110static void restart_grace(void)
111{
112 if (nlmsvc_ops) {
113 struct net *net = &init_net;
114 struct lockd_net *ln = net_generic(net, lockd_net_id);
115
116 cancel_delayed_work_sync(&ln->grace_period_end);
117 locks_end_grace(&ln->lockd_manager);
118 nlmsvc_invalidate_all();
119 set_grace_period(net);
120 }
121}
122
123/*
124 * This is the lockd kernel thread
125 */
126static int
127lockd(void *vrqstp)
128{
129 int err = 0;
130 struct svc_rqst *rqstp = vrqstp;
131
132 /* try_to_freeze() is called from svc_recv() */
133 set_freezable();
134
135 /* Allow SIGKILL to tell lockd to drop all of its locks */
136 allow_signal(SIGKILL);
137
138 dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
139
140 if (!nlm_timeout)
141 nlm_timeout = LOCKD_DFLT_TIMEO;
142 nlmsvc_timeout = nlm_timeout * HZ;
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_socks;
257 set_grace_period(net);
258 dprintk("lockd_up_net: per-net data created; net=%p\n", net);
259 return 0;
260
261err_socks:
262 svc_rpcb_cleanup(serv, net);
263err_bind:
264 ln->nlmsvc_users--;
265 return error;
266}
267
268static void lockd_down_net(struct svc_serv *serv, struct net *net)
269{
270 struct lockd_net *ln = net_generic(net, lockd_net_id);
271
272 if (ln->nlmsvc_users) {
273 if (--ln->nlmsvc_users == 0) {
274 nlm_shutdown_hosts_net(net);
275 cancel_delayed_work_sync(&ln->grace_period_end);
276 locks_end_grace(&ln->lockd_manager);
277 svc_shutdown_net(serv, net);
278 dprintk("lockd_down_net: per-net data destroyed; net=%p\n", net);
279 }
280 } else {
281 printk(KERN_ERR "lockd_down_net: no users! task=%p, net=%p\n",
282 nlmsvc_task, net);
283 BUG();
284 }
285}
286
287static int lockd_start_svc(struct svc_serv *serv)
288{
289 int error;
290
291 if (nlmsvc_rqst)
292 return 0;
293
294 /*
295 * Create the kernel thread and wait for it to start.
296 */
297 nlmsvc_rqst = svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE);
298 if (IS_ERR(nlmsvc_rqst)) {
299 error = PTR_ERR(nlmsvc_rqst);
300 printk(KERN_WARNING
301 "lockd_up: svc_rqst allocation failed, error=%d\n",
302 error);
303 goto out_rqst;
304 }
305
306 svc_sock_update_bufs(serv);
307 serv->sv_maxconn = nlm_max_connections;
308
309 nlmsvc_task = kthread_run(lockd, nlmsvc_rqst, "%s", serv->sv_name);
310 if (IS_ERR(nlmsvc_task)) {
311 error = PTR_ERR(nlmsvc_task);
312 printk(KERN_WARNING
313 "lockd_up: kthread_run failed, error=%d\n", error);
314 goto out_task;
315 }
316 dprintk("lockd_up: service started\n");
317 return 0;
318
319out_task:
320 svc_exit_thread(nlmsvc_rqst);
321 nlmsvc_task = NULL;
322out_rqst:
323 nlmsvc_rqst = NULL;
324 return error;
325}
326
327static struct svc_serv *lockd_create_svc(void)
328{
329 struct svc_serv *serv;
330
331 /*
332 * Check whether we're already up and running.
333 */
334 if (nlmsvc_rqst) {
335 /*
336 * Note: increase service usage, because later in case of error
337 * svc_destroy() will be called.
338 */
339 svc_get(nlmsvc_rqst->rq_server);
340 return nlmsvc_rqst->rq_server;
341 }
342
343 /*
344 * Sanity check: if there's no pid,
345 * we should be the first user ...
346 */
347 if (nlmsvc_users)
348 printk(KERN_WARNING
349 "lockd_up: no pid, %d users??\n", nlmsvc_users);
350
351 serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, NULL);
352 if (!serv) {
353 printk(KERN_WARNING "lockd_up: create service failed\n");
354 return ERR_PTR(-ENOMEM);
355 }
356 dprintk("lockd_up: service created\n");
357 return serv;
358}
359
360/*
361 * Bring up the lockd process if it's not already up.
362 */
363int lockd_up(struct net *net)
364{
365 struct svc_serv *serv;
366 int error;
367
368 mutex_lock(&nlmsvc_mutex);
369
370 serv = lockd_create_svc();
371 if (IS_ERR(serv)) {
372 error = PTR_ERR(serv);
373 goto err_create;
374 }
375
376 error = lockd_up_net(serv, net);
377 if (error < 0)
378 goto err_net;
379
380 error = lockd_start_svc(serv);
381 if (error < 0)
382 goto err_start;
383
384 nlmsvc_users++;
385 /*
386 * Note: svc_serv structures have an initial use count of 1,
387 * so we exit through here on both success and failure.
388 */
389err_net:
390 svc_destroy(serv);
391err_create:
392 mutex_unlock(&nlmsvc_mutex);
393 return error;
394
395err_start:
396 lockd_down_net(serv, net);
397 goto err_net;
398}
399EXPORT_SYMBOL_GPL(lockd_up);
400
401/*
402 * Decrement the user count and bring down lockd if we're the last.
403 */
404void
405lockd_down(struct net *net)
406{
407 mutex_lock(&nlmsvc_mutex);
408 lockd_down_net(nlmsvc_rqst->rq_server, net);
409 if (nlmsvc_users) {
410 if (--nlmsvc_users)
411 goto out;
412 } else {
413 printk(KERN_ERR "lockd_down: no users! task=%p\n",
414 nlmsvc_task);
415 BUG();
416 }
417
418 if (!nlmsvc_task) {
419 printk(KERN_ERR "lockd_down: no lockd running.\n");
420 BUG();
421 }
422 kthread_stop(nlmsvc_task);
423 dprintk("lockd_down: service stopped\n");
424 svc_exit_thread(nlmsvc_rqst);
425 dprintk("lockd_down: service destroyed\n");
426 nlmsvc_task = NULL;
427 nlmsvc_rqst = NULL;
428out:
429 mutex_unlock(&nlmsvc_mutex);
430}
431EXPORT_SYMBOL_GPL(lockd_down);
432
433#ifdef CONFIG_SYSCTL
434
435/*
436 * Sysctl parameters (same as module parameters, different interface).
437 */
438
439static ctl_table nlm_sysctls[] = {
440 {
441 .procname = "nlm_grace_period",
442 .data = &nlm_grace_period,
443 .maxlen = sizeof(unsigned long),
444 .mode = 0644,
445 .proc_handler = proc_doulongvec_minmax,
446 .extra1 = (unsigned long *) &nlm_grace_period_min,
447 .extra2 = (unsigned long *) &nlm_grace_period_max,
448 },
449 {
450 .procname = "nlm_timeout",
451 .data = &nlm_timeout,
452 .maxlen = sizeof(unsigned long),
453 .mode = 0644,
454 .proc_handler = proc_doulongvec_minmax,
455 .extra1 = (unsigned long *) &nlm_timeout_min,
456 .extra2 = (unsigned long *) &nlm_timeout_max,
457 },
458 {
459 .procname = "nlm_udpport",
460 .data = &nlm_udpport,
461 .maxlen = sizeof(int),
462 .mode = 0644,
463 .proc_handler = proc_dointvec_minmax,
464 .extra1 = (int *) &nlm_port_min,
465 .extra2 = (int *) &nlm_port_max,
466 },
467 {
468 .procname = "nlm_tcpport",
469 .data = &nlm_tcpport,
470 .maxlen = sizeof(int),
471 .mode = 0644,
472 .proc_handler = proc_dointvec_minmax,
473 .extra1 = (int *) &nlm_port_min,
474 .extra2 = (int *) &nlm_port_max,
475 },
476 {
477 .procname = "nsm_use_hostnames",
478 .data = &nsm_use_hostnames,
479 .maxlen = sizeof(int),
480 .mode = 0644,
481 .proc_handler = proc_dointvec,
482 },
483 {
484 .procname = "nsm_local_state",
485 .data = &nsm_local_state,
486 .maxlen = sizeof(int),
487 .mode = 0644,
488 .proc_handler = proc_dointvec,
489 },
490 { }
491};
492
493static ctl_table nlm_sysctl_dir[] = {
494 {
495 .procname = "nfs",
496 .mode = 0555,
497 .child = nlm_sysctls,
498 },
499 { }
500};
501
502static ctl_table nlm_sysctl_root[] = {
503 {
504 .procname = "fs",
505 .mode = 0555,
506 .child = nlm_sysctl_dir,
507 },
508 { }
509};
510
511#endif /* CONFIG_SYSCTL */
512
513/*
514 * Module (and sysfs) parameters.
515 */
516
517#define param_set_min_max(name, type, which_strtol, min, max) \
518static int param_set_##name(const char *val, struct kernel_param *kp) \
519{ \
520 char *endp; \
521 __typeof__(type) num = which_strtol(val, &endp, 0); \
522 if (endp == val || *endp || num < (min) || num > (max)) \
523 return -EINVAL; \
524 *((type *) kp->arg) = num; \
525 return 0; \
526}
527
528static inline int is_callback(u32 proc)
529{
530 return proc == NLMPROC_GRANTED
531 || proc == NLMPROC_GRANTED_MSG
532 || proc == NLMPROC_TEST_RES
533 || proc == NLMPROC_LOCK_RES
534 || proc == NLMPROC_CANCEL_RES
535 || proc == NLMPROC_UNLOCK_RES
536 || proc == NLMPROC_NSM_NOTIFY;
537}
538
539
540static int lockd_authenticate(struct svc_rqst *rqstp)
541{
542 rqstp->rq_client = NULL;
543 switch (rqstp->rq_authop->flavour) {
544 case RPC_AUTH_NULL:
545 case RPC_AUTH_UNIX:
546 if (rqstp->rq_proc == 0)
547 return SVC_OK;
548 if (is_callback(rqstp->rq_proc)) {
549 /* Leave it to individual procedures to
550 * call nlmsvc_lookup_host(rqstp)
551 */
552 return SVC_OK;
553 }
554 return svc_set_client(rqstp);
555 }
556 return SVC_DENIED;
557}
558
559
560param_set_min_max(port, int, simple_strtol, 0, 65535)
561param_set_min_max(grace_period, unsigned long, simple_strtoul,
562 nlm_grace_period_min, nlm_grace_period_max)
563param_set_min_max(timeout, unsigned long, simple_strtoul,
564 nlm_timeout_min, nlm_timeout_max)
565
566MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
567MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
568MODULE_LICENSE("GPL");
569
570module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
571 &nlm_grace_period, 0644);
572module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
573 &nlm_timeout, 0644);
574module_param_call(nlm_udpport, param_set_port, param_get_int,
575 &nlm_udpport, 0644);
576module_param_call(nlm_tcpport, param_set_port, param_get_int,
577 &nlm_tcpport, 0644);
578module_param(nsm_use_hostnames, bool, 0644);
579module_param(nlm_max_connections, uint, 0644);
580
581static int lockd_init_net(struct net *net)
582{
583 struct lockd_net *ln = net_generic(net, lockd_net_id);
584
585 INIT_DELAYED_WORK(&ln->grace_period_end, grace_ender);
586 INIT_LIST_HEAD(&ln->grace_list);
587 spin_lock_init(&ln->nsm_clnt_lock);
588 return 0;
589}
590
591static void lockd_exit_net(struct net *net)
592{
593}
594
595static struct pernet_operations lockd_net_ops = {
596 .init = lockd_init_net,
597 .exit = lockd_exit_net,
598 .id = &lockd_net_id,
599 .size = sizeof(struct lockd_net),
600};
601
602
603/*
604 * Initialising and terminating the module.
605 */
606
607static int __init init_nlm(void)
608{
609 int err;
610
611#ifdef CONFIG_SYSCTL
612 err = -ENOMEM;
613 nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
614 if (nlm_sysctl_table == NULL)
615 goto err_sysctl;
616#endif
617 err = register_pernet_subsys(&lockd_net_ops);
618 if (err)
619 goto err_pernet;
620 return 0;
621
622err_pernet:
623#ifdef CONFIG_SYSCTL
624 unregister_sysctl_table(nlm_sysctl_table);
625#endif
626err_sysctl:
627 return err;
628}
629
630static void __exit exit_nlm(void)
631{
632 /* FIXME: delete all NLM clients */
633 nlm_shutdown_hosts();
634 unregister_pernet_subsys(&lockd_net_ops);
635#ifdef CONFIG_SYSCTL
636 unregister_sysctl_table(nlm_sysctl_table);
637#endif
638}
639
640module_init(init_nlm);
641module_exit(exit_nlm);
642
643/*
644 * Define NLM program and procedures
645 */
646static struct svc_version nlmsvc_version1 = {
647 .vs_vers = 1,
648 .vs_nproc = 17,
649 .vs_proc = nlmsvc_procedures,
650 .vs_xdrsize = NLMSVC_XDRSIZE,
651};
652static struct svc_version nlmsvc_version3 = {
653 .vs_vers = 3,
654 .vs_nproc = 24,
655 .vs_proc = nlmsvc_procedures,
656 .vs_xdrsize = NLMSVC_XDRSIZE,
657};
658#ifdef CONFIG_LOCKD_V4
659static struct svc_version nlmsvc_version4 = {
660 .vs_vers = 4,
661 .vs_nproc = 24,
662 .vs_proc = nlmsvc_procedures4,
663 .vs_xdrsize = NLMSVC_XDRSIZE,
664};
665#endif
666static struct svc_version * nlmsvc_version[] = {
667 [1] = &nlmsvc_version1,
668 [3] = &nlmsvc_version3,
669#ifdef CONFIG_LOCKD_V4
670 [4] = &nlmsvc_version4,
671#endif
672};
673
674static struct svc_stat nlmsvc_stats;
675
676#define NLM_NRVERS ARRAY_SIZE(nlmsvc_version)
677static struct svc_program nlmsvc_program = {
678 .pg_prog = NLM_PROGRAM, /* program number */
679 .pg_nvers = NLM_NRVERS, /* number of entries in nlmsvc_version */
680 .pg_vers = nlmsvc_version, /* version table */
681 .pg_name = "lockd", /* service name */
682 .pg_class = "nfsd", /* share authentication with nfsd */
683 .pg_stats = &nlmsvc_stats, /* stats table */
684 .pg_authenticate = &lockd_authenticate /* export authentication */
685};
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
29#include <linux/sunrpc/types.h>
30#include <linux/sunrpc/stats.h>
31#include <linux/sunrpc/clnt.h>
32#include <linux/sunrpc/svc.h>
33#include <linux/sunrpc/svcsock.h>
34#include <net/ip.h>
35#include <linux/lockd/lockd.h>
36#include <linux/nfs.h>
37
38#include "netns.h"
39
40#define NLMDBG_FACILITY NLMDBG_SVC
41#define LOCKD_BUFSIZE (1024 + NLMSVC_XDRSIZE)
42#define ALLOWED_SIGS (sigmask(SIGKILL))
43
44static struct svc_program nlmsvc_program;
45
46struct nlmsvc_binding * nlmsvc_ops;
47EXPORT_SYMBOL_GPL(nlmsvc_ops);
48
49static DEFINE_MUTEX(nlmsvc_mutex);
50static unsigned int nlmsvc_users;
51static struct task_struct *nlmsvc_task;
52static struct svc_rqst *nlmsvc_rqst;
53unsigned long nlmsvc_timeout;
54
55int lockd_net_id;
56
57/*
58 * These can be set at insmod time (useful for NFS as root filesystem),
59 * and also changed through the sysctl interface. -- Jamie Lokier, Aug 2003
60 */
61static unsigned long nlm_grace_period;
62static unsigned long nlm_timeout = LOCKD_DFLT_TIMEO;
63static int nlm_udpport, nlm_tcpport;
64
65/* RLIM_NOFILE defaults to 1024. That seems like a reasonable default here. */
66static unsigned int nlm_max_connections = 1024;
67
68/*
69 * Constants needed for the sysctl interface.
70 */
71static const unsigned long nlm_grace_period_min = 0;
72static const unsigned long nlm_grace_period_max = 240;
73static const unsigned long nlm_timeout_min = 3;
74static const unsigned long nlm_timeout_max = 20;
75static const int nlm_port_min = 0, nlm_port_max = 65535;
76
77#ifdef CONFIG_SYSCTL
78static struct ctl_table_header * nlm_sysctl_table;
79#endif
80
81static unsigned long get_lockd_grace_period(void)
82{
83 /* Note: nlm_timeout should always be nonzero */
84 if (nlm_grace_period)
85 return roundup(nlm_grace_period, nlm_timeout) * HZ;
86 else
87 return nlm_timeout * 5 * HZ;
88}
89
90static struct lock_manager lockd_manager = {
91};
92
93static void grace_ender(struct work_struct *not_used)
94{
95 locks_end_grace(&lockd_manager);
96}
97
98static DECLARE_DELAYED_WORK(grace_period_end, grace_ender);
99
100static void set_grace_period(void)
101{
102 unsigned long grace_period = get_lockd_grace_period();
103
104 locks_start_grace(&lockd_manager);
105 cancel_delayed_work_sync(&grace_period_end);
106 schedule_delayed_work(&grace_period_end, grace_period);
107}
108
109static void restart_grace(void)
110{
111 if (nlmsvc_ops) {
112 cancel_delayed_work_sync(&grace_period_end);
113 locks_end_grace(&lockd_manager);
114 nlmsvc_invalidate_all();
115 set_grace_period();
116 }
117}
118
119/*
120 * This is the lockd kernel thread
121 */
122static int
123lockd(void *vrqstp)
124{
125 int err = 0, preverr = 0;
126 struct svc_rqst *rqstp = vrqstp;
127
128 /* try_to_freeze() is called from svc_recv() */
129 set_freezable();
130
131 /* Allow SIGKILL to tell lockd to drop all of its locks */
132 allow_signal(SIGKILL);
133
134 dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
135
136 if (!nlm_timeout)
137 nlm_timeout = LOCKD_DFLT_TIMEO;
138 nlmsvc_timeout = nlm_timeout * HZ;
139
140 set_grace_period();
141
142 /*
143 * The main request loop. We don't terminate until the last
144 * NFS mount or NFS daemon has gone away.
145 */
146 while (!kthread_should_stop()) {
147 long timeout = MAX_SCHEDULE_TIMEOUT;
148 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
149
150 /* update sv_maxconn if it has changed */
151 rqstp->rq_server->sv_maxconn = nlm_max_connections;
152
153 if (signalled()) {
154 flush_signals(current);
155 restart_grace();
156 continue;
157 }
158
159 timeout = nlmsvc_retry_blocked();
160
161 /*
162 * Find a socket with data available and call its
163 * recvfrom routine.
164 */
165 err = svc_recv(rqstp, timeout);
166 if (err == -EAGAIN || err == -EINTR) {
167 preverr = err;
168 continue;
169 }
170 if (err < 0) {
171 if (err != preverr) {
172 printk(KERN_WARNING "%s: unexpected error "
173 "from svc_recv (%d)\n", __func__, err);
174 preverr = err;
175 }
176 schedule_timeout_interruptible(HZ);
177 continue;
178 }
179 preverr = err;
180
181 dprintk("lockd: request from %s\n",
182 svc_print_addr(rqstp, buf, sizeof(buf)));
183
184 svc_process(rqstp);
185 }
186 flush_signals(current);
187 cancel_delayed_work_sync(&grace_period_end);
188 locks_end_grace(&lockd_manager);
189 if (nlmsvc_ops)
190 nlmsvc_invalidate_all();
191 nlm_shutdown_hosts();
192 return 0;
193}
194
195static int create_lockd_listener(struct svc_serv *serv, const char *name,
196 struct net *net, const int family,
197 const unsigned short port)
198{
199 struct svc_xprt *xprt;
200
201 xprt = svc_find_xprt(serv, name, net, family, 0);
202 if (xprt == NULL)
203 return svc_create_xprt(serv, name, net, family, port,
204 SVC_SOCK_DEFAULTS);
205 svc_xprt_put(xprt);
206 return 0;
207}
208
209static int create_lockd_family(struct svc_serv *serv, struct net *net,
210 const int family)
211{
212 int err;
213
214 err = create_lockd_listener(serv, "udp", net, family, nlm_udpport);
215 if (err < 0)
216 return err;
217
218 return create_lockd_listener(serv, "tcp", net, family, nlm_tcpport);
219}
220
221/*
222 * Ensure there are active UDP and TCP listeners for lockd.
223 *
224 * Even if we have only TCP NFS mounts and/or TCP NFSDs, some
225 * local services (such as rpc.statd) still require UDP, and
226 * some NFS servers do not yet support NLM over TCP.
227 *
228 * Returns zero if all listeners are available; otherwise a
229 * negative errno value is returned.
230 */
231static int make_socks(struct svc_serv *serv, struct net *net)
232{
233 static int warned;
234 int err;
235
236 err = create_lockd_family(serv, net, PF_INET);
237 if (err < 0)
238 goto out_err;
239
240 err = create_lockd_family(serv, net, PF_INET6);
241 if (err < 0 && err != -EAFNOSUPPORT)
242 goto out_err;
243
244 warned = 0;
245 return 0;
246
247out_err:
248 if (warned++ == 0)
249 printk(KERN_WARNING
250 "lockd_up: makesock failed, error=%d\n", err);
251 return err;
252}
253
254static int lockd_up_net(struct svc_serv *serv, struct net *net)
255{
256 struct lockd_net *ln = net_generic(net, lockd_net_id);
257 int error;
258
259 if (ln->nlmsvc_users++)
260 return 0;
261
262 error = svc_bind(serv, net);
263 if (error)
264 goto err_bind;
265
266 error = make_socks(serv, net);
267 if (error < 0)
268 goto err_socks;
269 dprintk("lockd_up_net: per-net data created; net=%p\n", net);
270 return 0;
271
272err_socks:
273 svc_rpcb_cleanup(serv, net);
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 svc_shutdown_net(serv, net);
287 dprintk("lockd_down_net: per-net data destroyed; net=%p\n", net);
288 }
289 } else {
290 printk(KERN_ERR "lockd_down_net: no users! task=%p, net=%p\n",
291 nlmsvc_task, net);
292 BUG();
293 }
294}
295
296static int lockd_start_svc(struct svc_serv *serv)
297{
298 int error;
299
300 if (nlmsvc_rqst)
301 return 0;
302
303 /*
304 * Create the kernel thread and wait for it to start.
305 */
306 nlmsvc_rqst = svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE);
307 if (IS_ERR(nlmsvc_rqst)) {
308 error = PTR_ERR(nlmsvc_rqst);
309 printk(KERN_WARNING
310 "lockd_up: svc_rqst allocation failed, error=%d\n",
311 error);
312 goto out_rqst;
313 }
314
315 svc_sock_update_bufs(serv);
316 serv->sv_maxconn = nlm_max_connections;
317
318 nlmsvc_task = kthread_run(lockd, nlmsvc_rqst, serv->sv_name);
319 if (IS_ERR(nlmsvc_task)) {
320 error = PTR_ERR(nlmsvc_task);
321 printk(KERN_WARNING
322 "lockd_up: kthread_run failed, error=%d\n", error);
323 goto out_task;
324 }
325 dprintk("lockd_up: service started\n");
326 return 0;
327
328out_task:
329 svc_exit_thread(nlmsvc_rqst);
330 nlmsvc_task = NULL;
331out_rqst:
332 nlmsvc_rqst = NULL;
333 return error;
334}
335
336static struct svc_serv *lockd_create_svc(void)
337{
338 struct svc_serv *serv;
339
340 /*
341 * Check whether we're already up and running.
342 */
343 if (nlmsvc_rqst) {
344 /*
345 * Note: increase service usage, because later in case of error
346 * svc_destroy() will be called.
347 */
348 svc_get(nlmsvc_rqst->rq_server);
349 return nlmsvc_rqst->rq_server;
350 }
351
352 /*
353 * Sanity check: if there's no pid,
354 * we should be the first user ...
355 */
356 if (nlmsvc_users)
357 printk(KERN_WARNING
358 "lockd_up: no pid, %d users??\n", nlmsvc_users);
359
360 serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, NULL);
361 if (!serv) {
362 printk(KERN_WARNING "lockd_up: create service failed\n");
363 return ERR_PTR(-ENOMEM);
364 }
365 dprintk("lockd_up: service created\n");
366 return serv;
367}
368
369/*
370 * Bring up the lockd process if it's not already up.
371 */
372int lockd_up(struct net *net)
373{
374 struct svc_serv *serv;
375 int error;
376
377 mutex_lock(&nlmsvc_mutex);
378
379 serv = lockd_create_svc();
380 if (IS_ERR(serv)) {
381 error = PTR_ERR(serv);
382 goto err_create;
383 }
384
385 error = lockd_up_net(serv, net);
386 if (error < 0)
387 goto err_net;
388
389 error = lockd_start_svc(serv);
390 if (error < 0)
391 goto err_start;
392
393 nlmsvc_users++;
394 /*
395 * Note: svc_serv structures have an initial use count of 1,
396 * so we exit through here on both success and failure.
397 */
398err_net:
399 svc_destroy(serv);
400err_create:
401 mutex_unlock(&nlmsvc_mutex);
402 return error;
403
404err_start:
405 lockd_down_net(serv, net);
406 goto err_net;
407}
408EXPORT_SYMBOL_GPL(lockd_up);
409
410/*
411 * Decrement the user count and bring down lockd if we're the last.
412 */
413void
414lockd_down(struct net *net)
415{
416 mutex_lock(&nlmsvc_mutex);
417 lockd_down_net(nlmsvc_rqst->rq_server, net);
418 if (nlmsvc_users) {
419 if (--nlmsvc_users)
420 goto out;
421 } else {
422 printk(KERN_ERR "lockd_down: no users! task=%p\n",
423 nlmsvc_task);
424 BUG();
425 }
426
427 if (!nlmsvc_task) {
428 printk(KERN_ERR "lockd_down: no lockd running.\n");
429 BUG();
430 }
431 kthread_stop(nlmsvc_task);
432 dprintk("lockd_down: service stopped\n");
433 svc_exit_thread(nlmsvc_rqst);
434 dprintk("lockd_down: service destroyed\n");
435 nlmsvc_task = NULL;
436 nlmsvc_rqst = NULL;
437out:
438 mutex_unlock(&nlmsvc_mutex);
439}
440EXPORT_SYMBOL_GPL(lockd_down);
441
442#ifdef CONFIG_SYSCTL
443
444/*
445 * Sysctl parameters (same as module parameters, different interface).
446 */
447
448static ctl_table nlm_sysctls[] = {
449 {
450 .procname = "nlm_grace_period",
451 .data = &nlm_grace_period,
452 .maxlen = sizeof(unsigned long),
453 .mode = 0644,
454 .proc_handler = proc_doulongvec_minmax,
455 .extra1 = (unsigned long *) &nlm_grace_period_min,
456 .extra2 = (unsigned long *) &nlm_grace_period_max,
457 },
458 {
459 .procname = "nlm_timeout",
460 .data = &nlm_timeout,
461 .maxlen = sizeof(unsigned long),
462 .mode = 0644,
463 .proc_handler = proc_doulongvec_minmax,
464 .extra1 = (unsigned long *) &nlm_timeout_min,
465 .extra2 = (unsigned long *) &nlm_timeout_max,
466 },
467 {
468 .procname = "nlm_udpport",
469 .data = &nlm_udpport,
470 .maxlen = sizeof(int),
471 .mode = 0644,
472 .proc_handler = proc_dointvec_minmax,
473 .extra1 = (int *) &nlm_port_min,
474 .extra2 = (int *) &nlm_port_max,
475 },
476 {
477 .procname = "nlm_tcpport",
478 .data = &nlm_tcpport,
479 .maxlen = sizeof(int),
480 .mode = 0644,
481 .proc_handler = proc_dointvec_minmax,
482 .extra1 = (int *) &nlm_port_min,
483 .extra2 = (int *) &nlm_port_max,
484 },
485 {
486 .procname = "nsm_use_hostnames",
487 .data = &nsm_use_hostnames,
488 .maxlen = sizeof(int),
489 .mode = 0644,
490 .proc_handler = proc_dointvec,
491 },
492 {
493 .procname = "nsm_local_state",
494 .data = &nsm_local_state,
495 .maxlen = sizeof(int),
496 .mode = 0644,
497 .proc_handler = proc_dointvec,
498 },
499 { }
500};
501
502static ctl_table nlm_sysctl_dir[] = {
503 {
504 .procname = "nfs",
505 .mode = 0555,
506 .child = nlm_sysctls,
507 },
508 { }
509};
510
511static ctl_table nlm_sysctl_root[] = {
512 {
513 .procname = "fs",
514 .mode = 0555,
515 .child = nlm_sysctl_dir,
516 },
517 { }
518};
519
520#endif /* CONFIG_SYSCTL */
521
522/*
523 * Module (and sysfs) parameters.
524 */
525
526#define param_set_min_max(name, type, which_strtol, min, max) \
527static int param_set_##name(const char *val, struct kernel_param *kp) \
528{ \
529 char *endp; \
530 __typeof__(type) num = which_strtol(val, &endp, 0); \
531 if (endp == val || *endp || num < (min) || num > (max)) \
532 return -EINVAL; \
533 *((type *) kp->arg) = num; \
534 return 0; \
535}
536
537static inline int is_callback(u32 proc)
538{
539 return proc == NLMPROC_GRANTED
540 || proc == NLMPROC_GRANTED_MSG
541 || proc == NLMPROC_TEST_RES
542 || proc == NLMPROC_LOCK_RES
543 || proc == NLMPROC_CANCEL_RES
544 || proc == NLMPROC_UNLOCK_RES
545 || proc == NLMPROC_NSM_NOTIFY;
546}
547
548
549static int lockd_authenticate(struct svc_rqst *rqstp)
550{
551 rqstp->rq_client = NULL;
552 switch (rqstp->rq_authop->flavour) {
553 case RPC_AUTH_NULL:
554 case RPC_AUTH_UNIX:
555 if (rqstp->rq_proc == 0)
556 return SVC_OK;
557 if (is_callback(rqstp->rq_proc)) {
558 /* Leave it to individual procedures to
559 * call nlmsvc_lookup_host(rqstp)
560 */
561 return SVC_OK;
562 }
563 return svc_set_client(rqstp);
564 }
565 return SVC_DENIED;
566}
567
568
569param_set_min_max(port, int, simple_strtol, 0, 65535)
570param_set_min_max(grace_period, unsigned long, simple_strtoul,
571 nlm_grace_period_min, nlm_grace_period_max)
572param_set_min_max(timeout, unsigned long, simple_strtoul,
573 nlm_timeout_min, nlm_timeout_max)
574
575MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
576MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
577MODULE_LICENSE("GPL");
578
579module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
580 &nlm_grace_period, 0644);
581module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
582 &nlm_timeout, 0644);
583module_param_call(nlm_udpport, param_set_port, param_get_int,
584 &nlm_udpport, 0644);
585module_param_call(nlm_tcpport, param_set_port, param_get_int,
586 &nlm_tcpport, 0644);
587module_param(nsm_use_hostnames, bool, 0644);
588module_param(nlm_max_connections, uint, 0644);
589
590static int lockd_init_net(struct net *net)
591{
592 return 0;
593}
594
595static void lockd_exit_net(struct net *net)
596{
597}
598
599static struct pernet_operations lockd_net_ops = {
600 .init = lockd_init_net,
601 .exit = lockd_exit_net,
602 .id = &lockd_net_id,
603 .size = sizeof(struct lockd_net),
604};
605
606
607/*
608 * Initialising and terminating the module.
609 */
610
611static int __init init_nlm(void)
612{
613 int err;
614
615#ifdef CONFIG_SYSCTL
616 err = -ENOMEM;
617 nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
618 if (nlm_sysctl_table == NULL)
619 goto err_sysctl;
620#endif
621 err = register_pernet_subsys(&lockd_net_ops);
622 if (err)
623 goto err_pernet;
624 return 0;
625
626err_pernet:
627#ifdef CONFIG_SYSCTL
628 unregister_sysctl_table(nlm_sysctl_table);
629#endif
630err_sysctl:
631 return err;
632}
633
634static void __exit exit_nlm(void)
635{
636 /* FIXME: delete all NLM clients */
637 nlm_shutdown_hosts();
638 unregister_pernet_subsys(&lockd_net_ops);
639#ifdef CONFIG_SYSCTL
640 unregister_sysctl_table(nlm_sysctl_table);
641#endif
642}
643
644module_init(init_nlm);
645module_exit(exit_nlm);
646
647/*
648 * Define NLM program and procedures
649 */
650static struct svc_version nlmsvc_version1 = {
651 .vs_vers = 1,
652 .vs_nproc = 17,
653 .vs_proc = nlmsvc_procedures,
654 .vs_xdrsize = NLMSVC_XDRSIZE,
655};
656static struct svc_version nlmsvc_version3 = {
657 .vs_vers = 3,
658 .vs_nproc = 24,
659 .vs_proc = nlmsvc_procedures,
660 .vs_xdrsize = NLMSVC_XDRSIZE,
661};
662#ifdef CONFIG_LOCKD_V4
663static struct svc_version nlmsvc_version4 = {
664 .vs_vers = 4,
665 .vs_nproc = 24,
666 .vs_proc = nlmsvc_procedures4,
667 .vs_xdrsize = NLMSVC_XDRSIZE,
668};
669#endif
670static struct svc_version * nlmsvc_version[] = {
671 [1] = &nlmsvc_version1,
672 [3] = &nlmsvc_version3,
673#ifdef CONFIG_LOCKD_V4
674 [4] = &nlmsvc_version4,
675#endif
676};
677
678static struct svc_stat nlmsvc_stats;
679
680#define NLM_NRVERS ARRAY_SIZE(nlmsvc_version)
681static struct svc_program nlmsvc_program = {
682 .pg_prog = NLM_PROGRAM, /* program number */
683 .pg_nvers = NLM_NRVERS, /* number of entries in nlmsvc_version */
684 .pg_vers = nlmsvc_version, /* version table */
685 .pg_name = "lockd", /* service name */
686 .pg_class = "nfsd", /* share authentication with nfsd */
687 .pg_stats = &nlmsvc_stats, /* stats table */
688 .pg_authenticate = &lockd_authenticate /* export authentication */
689};