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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/slab.h>
25#include <linux/smp.h>
26#include <linux/smp_lock.h>
27#include <linux/mutex.h>
28#include <linux/kthread.h>
29#include <linux/freezer.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 <net/ip.h>
37#include <linux/lockd/lockd.h>
38#include <linux/nfs.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
55
56
57
58
59static unsigned long nlm_grace_period;
60static unsigned long nlm_timeout = LOCKD_DFLT_TIMEO;
61static int nlm_udpport, nlm_tcpport;
62
63
64static unsigned int nlm_max_connections = 1024;
65
66
67
68
69static const unsigned long nlm_grace_period_min = 0;
70static const unsigned long nlm_grace_period_max = 240;
71static const unsigned long nlm_timeout_min = 3;
72static const unsigned long nlm_timeout_max = 20;
73static const int nlm_port_min = 0, nlm_port_max = 65535;
74
75#ifdef CONFIG_SYSCTL
76static struct ctl_table_header * nlm_sysctl_table;
77#endif
78
79static unsigned long get_lockd_grace_period(void)
80{
81
82 if (nlm_grace_period)
83 return roundup(nlm_grace_period, nlm_timeout) * HZ;
84 else
85 return nlm_timeout * 5 * HZ;
86}
87
88static struct lock_manager lockd_manager = {
89};
90
91static void grace_ender(struct work_struct *not_used)
92{
93 locks_end_grace(&lockd_manager);
94}
95
96static DECLARE_DELAYED_WORK(grace_period_end, grace_ender);
97
98static void set_grace_period(void)
99{
100 unsigned long grace_period = get_lockd_grace_period();
101
102 locks_start_grace(&lockd_manager);
103 cancel_delayed_work_sync(&grace_period_end);
104 schedule_delayed_work(&grace_period_end, grace_period);
105}
106
107static void restart_grace(void)
108{
109 if (nlmsvc_ops) {
110 cancel_delayed_work_sync(&grace_period_end);
111 locks_end_grace(&lockd_manager);
112 nlmsvc_invalidate_all();
113 set_grace_period();
114 }
115}
116
117
118
119
120static int
121lockd(void *vrqstp)
122{
123 int err = 0, preverr = 0;
124 struct svc_rqst *rqstp = vrqstp;
125
126
127 set_freezable();
128
129
130 allow_signal(SIGKILL);
131
132 dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
133
134
135
136
137
138
139
140
141 lock_kernel();
142
143 if (!nlm_timeout)
144 nlm_timeout = LOCKD_DFLT_TIMEO;
145 nlmsvc_timeout = nlm_timeout * HZ;
146
147 set_grace_period();
148
149
150
151
152
153 while (!kthread_should_stop()) {
154 long timeout = MAX_SCHEDULE_TIMEOUT;
155 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
156
157
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
170
171
172 err = svc_recv(rqstp, timeout);
173 if (err == -EAGAIN || err == -EINTR) {
174 preverr = err;
175 continue;
176 }
177 if (err < 0) {
178 if (err != preverr) {
179 printk(KERN_WARNING "%s: unexpected error "
180 "from svc_recv (%d)\n", __func__, err);
181 preverr = err;
182 }
183 schedule_timeout_interruptible(HZ);
184 continue;
185 }
186 preverr = err;
187
188 dprintk("lockd: request from %s\n",
189 svc_print_addr(rqstp, buf, sizeof(buf)));
190
191 svc_process(rqstp);
192 }
193 flush_signals(current);
194 cancel_delayed_work_sync(&grace_period_end);
195 locks_end_grace(&lockd_manager);
196 if (nlmsvc_ops)
197 nlmsvc_invalidate_all();
198 nlm_shutdown_hosts();
199 unlock_kernel();
200 return 0;
201}
202
203static int create_lockd_listener(struct svc_serv *serv, const char *name,
204 const int family, const unsigned short port)
205{
206 struct svc_xprt *xprt;
207
208 xprt = svc_find_xprt(serv, name, family, 0);
209 if (xprt == NULL)
210 return svc_create_xprt(serv, name, family, port,
211 SVC_SOCK_DEFAULTS);
212 svc_xprt_put(xprt);
213 return 0;
214}
215
216static int create_lockd_family(struct svc_serv *serv, const int family)
217{
218 int err;
219
220 err = create_lockd_listener(serv, "udp", family, nlm_udpport);
221 if (err < 0)
222 return err;
223
224 return create_lockd_listener(serv, "tcp", family, nlm_tcpport);
225}
226
227
228
229
230
231
232
233
234
235
236
237static int make_socks(struct svc_serv *serv)
238{
239 static int warned;
240 int err;
241
242 err = create_lockd_family(serv, PF_INET);
243 if (err < 0)
244 goto out_err;
245
246#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
247 err = create_lockd_family(serv, PF_INET6);
248 if (err < 0 && err != -EAFNOSUPPORT)
249 goto out_err;
250#endif
251
252 warned = 0;
253 return 0;
254
255out_err:
256 if (warned++ == 0)
257 printk(KERN_WARNING
258 "lockd_up: makesock failed, error=%d\n", err);
259 return err;
260}
261
262
263
264
265int lockd_up(void)
266{
267 struct svc_serv *serv;
268 int error = 0;
269
270 mutex_lock(&nlmsvc_mutex);
271
272
273
274 if (nlmsvc_rqst)
275 goto out;
276
277
278
279
280
281 if (nlmsvc_users)
282 printk(KERN_WARNING
283 "lockd_up: no pid, %d users??\n", nlmsvc_users);
284
285 error = -ENOMEM;
286 serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, NULL);
287 if (!serv) {
288 printk(KERN_WARNING "lockd_up: create service failed\n");
289 goto out;
290 }
291
292 error = make_socks(serv);
293 if (error < 0)
294 goto destroy_and_out;
295
296
297
298
299 nlmsvc_rqst = svc_prepare_thread(serv, &serv->sv_pools[0]);
300 if (IS_ERR(nlmsvc_rqst)) {
301 error = PTR_ERR(nlmsvc_rqst);
302 nlmsvc_rqst = NULL;
303 printk(KERN_WARNING
304 "lockd_up: svc_rqst allocation failed, error=%d\n",
305 error);
306 goto destroy_and_out;
307 }
308
309 svc_sock_update_bufs(serv);
310 serv->sv_maxconn = nlm_max_connections;
311
312 nlmsvc_task = kthread_run(lockd, nlmsvc_rqst, serv->sv_name);
313 if (IS_ERR(nlmsvc_task)) {
314 error = PTR_ERR(nlmsvc_task);
315 svc_exit_thread(nlmsvc_rqst);
316 nlmsvc_task = NULL;
317 nlmsvc_rqst = NULL;
318 printk(KERN_WARNING
319 "lockd_up: kthread_run failed, error=%d\n", error);
320 goto destroy_and_out;
321 }
322
323
324
325
326
327destroy_and_out:
328 svc_destroy(serv);
329out:
330 if (!error)
331 nlmsvc_users++;
332 mutex_unlock(&nlmsvc_mutex);
333 return error;
334}
335EXPORT_SYMBOL_GPL(lockd_up);
336
337
338
339
340void
341lockd_down(void)
342{
343 mutex_lock(&nlmsvc_mutex);
344 if (nlmsvc_users) {
345 if (--nlmsvc_users)
346 goto out;
347 } else {
348 printk(KERN_ERR "lockd_down: no users! task=%p\n",
349 nlmsvc_task);
350 BUG();
351 }
352
353 if (!nlmsvc_task) {
354 printk(KERN_ERR "lockd_down: no lockd running.\n");
355 BUG();
356 }
357 kthread_stop(nlmsvc_task);
358 svc_exit_thread(nlmsvc_rqst);
359 nlmsvc_task = NULL;
360 nlmsvc_rqst = NULL;
361out:
362 mutex_unlock(&nlmsvc_mutex);
363}
364EXPORT_SYMBOL_GPL(lockd_down);
365
366#ifdef CONFIG_SYSCTL
367
368
369
370
371
372static ctl_table nlm_sysctls[] = {
373 {
374 .ctl_name = CTL_UNNUMBERED,
375 .procname = "nlm_grace_period",
376 .data = &nlm_grace_period,
377 .maxlen = sizeof(unsigned long),
378 .mode = 0644,
379 .proc_handler = &proc_doulongvec_minmax,
380 .extra1 = (unsigned long *) &nlm_grace_period_min,
381 .extra2 = (unsigned long *) &nlm_grace_period_max,
382 },
383 {
384 .ctl_name = CTL_UNNUMBERED,
385 .procname = "nlm_timeout",
386 .data = &nlm_timeout,
387 .maxlen = sizeof(unsigned long),
388 .mode = 0644,
389 .proc_handler = &proc_doulongvec_minmax,
390 .extra1 = (unsigned long *) &nlm_timeout_min,
391 .extra2 = (unsigned long *) &nlm_timeout_max,
392 },
393 {
394 .ctl_name = CTL_UNNUMBERED,
395 .procname = "nlm_udpport",
396 .data = &nlm_udpport,
397 .maxlen = sizeof(int),
398 .mode = 0644,
399 .proc_handler = &proc_dointvec_minmax,
400 .extra1 = (int *) &nlm_port_min,
401 .extra2 = (int *) &nlm_port_max,
402 },
403 {
404 .ctl_name = CTL_UNNUMBERED,
405 .procname = "nlm_tcpport",
406 .data = &nlm_tcpport,
407 .maxlen = sizeof(int),
408 .mode = 0644,
409 .proc_handler = &proc_dointvec_minmax,
410 .extra1 = (int *) &nlm_port_min,
411 .extra2 = (int *) &nlm_port_max,
412 },
413 {
414 .ctl_name = CTL_UNNUMBERED,
415 .procname = "nsm_use_hostnames",
416 .data = &nsm_use_hostnames,
417 .maxlen = sizeof(int),
418 .mode = 0644,
419 .proc_handler = &proc_dointvec,
420 },
421 {
422 .ctl_name = CTL_UNNUMBERED,
423 .procname = "nsm_local_state",
424 .data = &nsm_local_state,
425 .maxlen = sizeof(int),
426 .mode = 0644,
427 .proc_handler = &proc_dointvec,
428 },
429 { .ctl_name = 0 }
430};
431
432static ctl_table nlm_sysctl_dir[] = {
433 {
434 .ctl_name = CTL_UNNUMBERED,
435 .procname = "nfs",
436 .mode = 0555,
437 .child = nlm_sysctls,
438 },
439 { .ctl_name = 0 }
440};
441
442static ctl_table nlm_sysctl_root[] = {
443 {
444 .ctl_name = CTL_FS,
445 .procname = "fs",
446 .mode = 0555,
447 .child = nlm_sysctl_dir,
448 },
449 { .ctl_name = 0 }
450};
451
452#endif
453
454
455
456
457
458#define param_set_min_max(name, type, which_strtol, min, max) \
459static int param_set_##name(const char *val, struct kernel_param *kp) \
460{ \
461 char *endp; \
462 __typeof__(type) num = which_strtol(val, &endp, 0); \
463 if (endp == val || *endp || num < (min) || num > (max)) \
464 return -EINVAL; \
465 *((int *) kp->arg) = num; \
466 return 0; \
467}
468
469static inline int is_callback(u32 proc)
470{
471 return proc == NLMPROC_GRANTED
472 || proc == NLMPROC_GRANTED_MSG
473 || proc == NLMPROC_TEST_RES
474 || proc == NLMPROC_LOCK_RES
475 || proc == NLMPROC_CANCEL_RES
476 || proc == NLMPROC_UNLOCK_RES
477 || proc == NLMPROC_NSM_NOTIFY;
478}
479
480
481static int lockd_authenticate(struct svc_rqst *rqstp)
482{
483 rqstp->rq_client = NULL;
484 switch (rqstp->rq_authop->flavour) {
485 case RPC_AUTH_NULL:
486 case RPC_AUTH_UNIX:
487 if (rqstp->rq_proc == 0)
488 return SVC_OK;
489 if (is_callback(rqstp->rq_proc)) {
490
491
492
493 return SVC_OK;
494 }
495 return svc_set_client(rqstp);
496 }
497 return SVC_DENIED;
498}
499
500
501param_set_min_max(port, int, simple_strtol, 0, 65535)
502param_set_min_max(grace_period, unsigned long, simple_strtoul,
503 nlm_grace_period_min, nlm_grace_period_max)
504param_set_min_max(timeout, unsigned long, simple_strtoul,
505 nlm_timeout_min, nlm_timeout_max)
506
507MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
508MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
509MODULE_LICENSE("GPL");
510
511module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
512 &nlm_grace_period, 0644);
513module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
514 &nlm_timeout, 0644);
515module_param_call(nlm_udpport, param_set_port, param_get_int,
516 &nlm_udpport, 0644);
517module_param_call(nlm_tcpport, param_set_port, param_get_int,
518 &nlm_tcpport, 0644);
519module_param(nsm_use_hostnames, bool, 0644);
520module_param(nlm_max_connections, uint, 0644);
521
522
523
524
525
526static int __init init_nlm(void)
527{
528#ifdef CONFIG_SYSCTL
529 nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
530 return nlm_sysctl_table ? 0 : -ENOMEM;
531#else
532 return 0;
533#endif
534}
535
536static void __exit exit_nlm(void)
537{
538
539 nlm_shutdown_hosts();
540#ifdef CONFIG_SYSCTL
541 unregister_sysctl_table(nlm_sysctl_table);
542#endif
543}
544
545module_init(init_nlm);
546module_exit(exit_nlm);
547
548
549
550
551static struct svc_version nlmsvc_version1 = {
552 .vs_vers = 1,
553 .vs_nproc = 17,
554 .vs_proc = nlmsvc_procedures,
555 .vs_xdrsize = NLMSVC_XDRSIZE,
556};
557static struct svc_version nlmsvc_version3 = {
558 .vs_vers = 3,
559 .vs_nproc = 24,
560 .vs_proc = nlmsvc_procedures,
561 .vs_xdrsize = NLMSVC_XDRSIZE,
562};
563#ifdef CONFIG_LOCKD_V4
564static struct svc_version nlmsvc_version4 = {
565 .vs_vers = 4,
566 .vs_nproc = 24,
567 .vs_proc = nlmsvc_procedures4,
568 .vs_xdrsize = NLMSVC_XDRSIZE,
569};
570#endif
571static struct svc_version * nlmsvc_version[] = {
572 [1] = &nlmsvc_version1,
573 [3] = &nlmsvc_version3,
574#ifdef CONFIG_LOCKD_V4
575 [4] = &nlmsvc_version4,
576#endif
577};
578
579static struct svc_stat nlmsvc_stats;
580
581#define NLM_NRVERS ARRAY_SIZE(nlmsvc_version)
582static struct svc_program nlmsvc_program = {
583 .pg_prog = NLM_PROGRAM,
584 .pg_nvers = NLM_NRVERS,
585 .pg_vers = nlmsvc_version,
586 .pg_name = "lockd",
587 .pg_class = "nfsd",
588 .pg_stats = &nlmsvc_stats,
589 .pg_authenticate = &lockd_authenticate
590};
591