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Linux/fs/lockd/svc.c

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  1 /*
  2  * linux/fs/lockd/svc.c
  3  *
  4  * This is the central lockd service.
  5  *
  6  * FIXME: Separate the lockd NFS server functionality from the lockd NFS
  7  *        client functionality. Oh why didn't Sun create two separate
  8  *        services in the first place?
  9  *
 10  * Authors:     Olaf Kirch (okir@monad.swb.de)
 11  *
 12  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
 13  */
 14 
 15 #include <linux/module.h>
 16 #include <linux/init.h>
 17 #include <linux/sysctl.h>
 18 #include <linux/moduleparam.h>
 19 
 20 #include <linux/sched.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 
 44 static struct svc_program       nlmsvc_program;
 45 
 46 struct nlmsvc_binding *         nlmsvc_ops;
 47 EXPORT_SYMBOL_GPL(nlmsvc_ops);
 48 
 49 static DEFINE_MUTEX(nlmsvc_mutex);
 50 static unsigned int             nlmsvc_users;
 51 static struct task_struct       *nlmsvc_task;
 52 static struct svc_rqst          *nlmsvc_rqst;
 53 unsigned long                   nlmsvc_timeout;
 54 
 55 int 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  */
 61 static unsigned long            nlm_grace_period;
 62 static unsigned long            nlm_timeout = LOCKD_DFLT_TIMEO;
 63 static int                      nlm_udpport, nlm_tcpport;
 64 
 65 /* RLIM_NOFILE defaults to 1024. That seems like a reasonable default here. */
 66 static unsigned int             nlm_max_connections = 1024;
 67 
 68 /*
 69  * Constants needed for the sysctl interface.
 70  */
 71 static const unsigned long      nlm_grace_period_min = 0;
 72 static const unsigned long      nlm_grace_period_max = 240;
 73 static const unsigned long      nlm_timeout_min = 3;
 74 static const unsigned long      nlm_timeout_max = 20;
 75 static const int                nlm_port_min = 0, nlm_port_max = 65535;
 76 
 77 #ifdef CONFIG_SYSCTL
 78 static struct ctl_table_header * nlm_sysctl_table;
 79 #endif
 80 
 81 static 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 
 90 static 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 
100 static 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 
110 static 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  */
126 static int
127 lockd(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         /*
141          * The main request loop. We don't terminate until the last
142          * NFS mount or NFS daemon has gone away.
143          */
144         while (!kthread_should_stop()) {
145                 long timeout = MAX_SCHEDULE_TIMEOUT;
146                 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
147 
148                 /* update sv_maxconn if it has changed */
149                 rqstp->rq_server->sv_maxconn = nlm_max_connections;
150 
151                 if (signalled()) {
152                         flush_signals(current);
153                         restart_grace();
154                         continue;
155                 }
156 
157                 timeout = nlmsvc_retry_blocked();
158 
159                 /*
160                  * Find a socket with data available and call its
161                  * recvfrom routine.
162                  */
163                 err = svc_recv(rqstp, timeout);
164                 if (err == -EAGAIN || err == -EINTR)
165                         continue;
166                 dprintk("lockd: request from %s\n",
167                                 svc_print_addr(rqstp, buf, sizeof(buf)));
168 
169                 svc_process(rqstp);
170         }
171         flush_signals(current);
172         if (nlmsvc_ops)
173                 nlmsvc_invalidate_all();
174         nlm_shutdown_hosts();
175         return 0;
176 }
177 
178 static int create_lockd_listener(struct svc_serv *serv, const char *name,
179                                  struct net *net, const int family,
180                                  const unsigned short port)
181 {
182         struct svc_xprt *xprt;
183 
184         xprt = svc_find_xprt(serv, name, net, family, 0);
185         if (xprt == NULL)
186                 return svc_create_xprt(serv, name, net, family, port,
187                                                 SVC_SOCK_DEFAULTS);
188         svc_xprt_put(xprt);
189         return 0;
190 }
191 
192 static int create_lockd_family(struct svc_serv *serv, struct net *net,
193                                const int family)
194 {
195         int err;
196 
197         err = create_lockd_listener(serv, "udp", net, family, nlm_udpport);
198         if (err < 0)
199                 return err;
200 
201         return create_lockd_listener(serv, "tcp", net, family, nlm_tcpport);
202 }
203 
204 /*
205  * Ensure there are active UDP and TCP listeners for lockd.
206  *
207  * Even if we have only TCP NFS mounts and/or TCP NFSDs, some
208  * local services (such as rpc.statd) still require UDP, and
209  * some NFS servers do not yet support NLM over TCP.
210  *
211  * Returns zero if all listeners are available; otherwise a
212  * negative errno value is returned.
213  */
214 static int make_socks(struct svc_serv *serv, struct net *net)
215 {
216         static int warned;
217         int err;
218 
219         err = create_lockd_family(serv, net, PF_INET);
220         if (err < 0)
221                 goto out_err;
222 
223         err = create_lockd_family(serv, net, PF_INET6);
224         if (err < 0 && err != -EAFNOSUPPORT)
225                 goto out_err;
226 
227         warned = 0;
228         return 0;
229 
230 out_err:
231         if (warned++ == 0)
232                 printk(KERN_WARNING
233                         "lockd_up: makesock failed, error=%d\n", err);
234         svc_shutdown_net(serv, net);
235         return err;
236 }
237 
238 static int lockd_up_net(struct svc_serv *serv, struct net *net)
239 {
240         struct lockd_net *ln = net_generic(net, lockd_net_id);
241         int error;
242 
243         if (ln->nlmsvc_users++)
244                 return 0;
245 
246         error = svc_bind(serv, net);
247         if (error)
248                 goto err_bind;
249 
250         error = make_socks(serv, net);
251         if (error < 0)
252                 goto err_bind;
253         set_grace_period(net);
254         dprintk("lockd_up_net: per-net data created; net=%p\n", net);
255         return 0;
256 
257 err_bind:
258         ln->nlmsvc_users--;
259         return error;
260 }
261 
262 static void lockd_down_net(struct svc_serv *serv, struct net *net)
263 {
264         struct lockd_net *ln = net_generic(net, lockd_net_id);
265 
266         if (ln->nlmsvc_users) {
267                 if (--ln->nlmsvc_users == 0) {
268                         nlm_shutdown_hosts_net(net);
269                         cancel_delayed_work_sync(&ln->grace_period_end);
270                         locks_end_grace(&ln->lockd_manager);
271                         svc_shutdown_net(serv, net);
272                         dprintk("lockd_down_net: per-net data destroyed; net=%p\n", net);
273                 }
274         } else {
275                 printk(KERN_ERR "lockd_down_net: no users! task=%p, net=%p\n",
276                                 nlmsvc_task, net);
277                 BUG();
278         }
279 }
280 
281 static int lockd_start_svc(struct svc_serv *serv)
282 {
283         int error;
284 
285         if (nlmsvc_rqst)
286                 return 0;
287 
288         /*
289          * Create the kernel thread and wait for it to start.
290          */
291         nlmsvc_rqst = svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE);
292         if (IS_ERR(nlmsvc_rqst)) {
293                 error = PTR_ERR(nlmsvc_rqst);
294                 printk(KERN_WARNING
295                         "lockd_up: svc_rqst allocation failed, error=%d\n",
296                         error);
297                 goto out_rqst;
298         }
299 
300         svc_sock_update_bufs(serv);
301         serv->sv_maxconn = nlm_max_connections;
302 
303         nlmsvc_task = kthread_run(lockd, nlmsvc_rqst, serv->sv_name);
304         if (IS_ERR(nlmsvc_task)) {
305                 error = PTR_ERR(nlmsvc_task);
306                 printk(KERN_WARNING
307                         "lockd_up: kthread_run failed, error=%d\n", error);
308                 goto out_task;
309         }
310         dprintk("lockd_up: service started\n");
311         return 0;
312 
313 out_task:
314         svc_exit_thread(nlmsvc_rqst);
315         nlmsvc_task = NULL;
316 out_rqst:
317         nlmsvc_rqst = NULL;
318         return error;
319 }
320 
321 static struct svc_serv *lockd_create_svc(void)
322 {
323         struct svc_serv *serv;
324 
325         /*
326          * Check whether we're already up and running.
327          */
328         if (nlmsvc_rqst) {
329                 /*
330                  * Note: increase service usage, because later in case of error
331                  * svc_destroy() will be called.
332                  */
333                 svc_get(nlmsvc_rqst->rq_server);
334                 return nlmsvc_rqst->rq_server;
335         }
336 
337         /*
338          * Sanity check: if there's no pid,
339          * we should be the first user ...
340          */
341         if (nlmsvc_users)
342                 printk(KERN_WARNING
343                         "lockd_up: no pid, %d users??\n", nlmsvc_users);
344 
345         if (!nlm_timeout)
346                 nlm_timeout = LOCKD_DFLT_TIMEO;
347         nlmsvc_timeout = nlm_timeout * HZ;
348 
349         serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, NULL);
350         if (!serv) {
351                 printk(KERN_WARNING "lockd_up: create service failed\n");
352                 return ERR_PTR(-ENOMEM);
353         }
354         dprintk("lockd_up: service created\n");
355         return serv;
356 }
357 
358 /*
359  * Bring up the lockd process if it's not already up.
360  */
361 int lockd_up(struct net *net)
362 {
363         struct svc_serv *serv;
364         int error;
365 
366         mutex_lock(&nlmsvc_mutex);
367 
368         serv = lockd_create_svc();
369         if (IS_ERR(serv)) {
370                 error = PTR_ERR(serv);
371                 goto err_create;
372         }
373 
374         error = lockd_up_net(serv, net);
375         if (error < 0)
376                 goto err_net;
377 
378         error = lockd_start_svc(serv);
379         if (error < 0)
380                 goto err_start;
381 
382         nlmsvc_users++;
383         /*
384          * Note: svc_serv structures have an initial use count of 1,
385          * so we exit through here on both success and failure.
386          */
387 err_net:
388         svc_destroy(serv);
389 err_create:
390         mutex_unlock(&nlmsvc_mutex);
391         return error;
392 
393 err_start:
394         lockd_down_net(serv, net);
395         goto err_net;
396 }
397 EXPORT_SYMBOL_GPL(lockd_up);
398 
399 /*
400  * Decrement the user count and bring down lockd if we're the last.
401  */
402 void
403 lockd_down(struct net *net)
404 {
405         mutex_lock(&nlmsvc_mutex);
406         lockd_down_net(nlmsvc_rqst->rq_server, net);
407         if (nlmsvc_users) {
408                 if (--nlmsvc_users)
409                         goto out;
410         } else {
411                 printk(KERN_ERR "lockd_down: no users! task=%p\n",
412                         nlmsvc_task);
413                 BUG();
414         }
415 
416         if (!nlmsvc_task) {
417                 printk(KERN_ERR "lockd_down: no lockd running.\n");
418                 BUG();
419         }
420         kthread_stop(nlmsvc_task);
421         dprintk("lockd_down: service stopped\n");
422         svc_exit_thread(nlmsvc_rqst);
423         dprintk("lockd_down: service destroyed\n");
424         nlmsvc_task = NULL;
425         nlmsvc_rqst = NULL;
426 out:
427         mutex_unlock(&nlmsvc_mutex);
428 }
429 EXPORT_SYMBOL_GPL(lockd_down);
430 
431 #ifdef CONFIG_SYSCTL
432 
433 /*
434  * Sysctl parameters (same as module parameters, different interface).
435  */
436 
437 static ctl_table nlm_sysctls[] = {
438         {
439                 .procname       = "nlm_grace_period",
440                 .data           = &nlm_grace_period,
441                 .maxlen         = sizeof(unsigned long),
442                 .mode           = 0644,
443                 .proc_handler   = proc_doulongvec_minmax,
444                 .extra1         = (unsigned long *) &nlm_grace_period_min,
445                 .extra2         = (unsigned long *) &nlm_grace_period_max,
446         },
447         {
448                 .procname       = "nlm_timeout",
449                 .data           = &nlm_timeout,
450                 .maxlen         = sizeof(unsigned long),
451                 .mode           = 0644,
452                 .proc_handler   = proc_doulongvec_minmax,
453                 .extra1         = (unsigned long *) &nlm_timeout_min,
454                 .extra2         = (unsigned long *) &nlm_timeout_max,
455         },
456         {
457                 .procname       = "nlm_udpport",
458                 .data           = &nlm_udpport,
459                 .maxlen         = sizeof(int),
460                 .mode           = 0644,
461                 .proc_handler   = proc_dointvec_minmax,
462                 .extra1         = (int *) &nlm_port_min,
463                 .extra2         = (int *) &nlm_port_max,
464         },
465         {
466                 .procname       = "nlm_tcpport",
467                 .data           = &nlm_tcpport,
468                 .maxlen         = sizeof(int),
469                 .mode           = 0644,
470                 .proc_handler   = proc_dointvec_minmax,
471                 .extra1         = (int *) &nlm_port_min,
472                 .extra2         = (int *) &nlm_port_max,
473         },
474         {
475                 .procname       = "nsm_use_hostnames",
476                 .data           = &nsm_use_hostnames,
477                 .maxlen         = sizeof(int),
478                 .mode           = 0644,
479                 .proc_handler   = proc_dointvec,
480         },
481         {
482                 .procname       = "nsm_local_state",
483                 .data           = &nsm_local_state,
484                 .maxlen         = sizeof(int),
485                 .mode           = 0644,
486                 .proc_handler   = proc_dointvec,
487         },
488         { }
489 };
490 
491 static ctl_table nlm_sysctl_dir[] = {
492         {
493                 .procname       = "nfs",
494                 .mode           = 0555,
495                 .child          = nlm_sysctls,
496         },
497         { }
498 };
499 
500 static ctl_table nlm_sysctl_root[] = {
501         {
502                 .procname       = "fs",
503                 .mode           = 0555,
504                 .child          = nlm_sysctl_dir,
505         },
506         { }
507 };
508 
509 #endif  /* CONFIG_SYSCTL */
510 
511 /*
512  * Module (and sysfs) parameters.
513  */
514 
515 #define param_set_min_max(name, type, which_strtol, min, max)           \
516 static int param_set_##name(const char *val, struct kernel_param *kp)   \
517 {                                                                       \
518         char *endp;                                                     \
519         __typeof__(type) num = which_strtol(val, &endp, 0);             \
520         if (endp == val || *endp || num < (min) || num > (max))         \
521                 return -EINVAL;                                         \
522         *((type *) kp->arg) = num;                                      \
523         return 0;                                                       \
524 }
525 
526 static inline int is_callback(u32 proc)
527 {
528         return proc == NLMPROC_GRANTED
529                 || proc == NLMPROC_GRANTED_MSG
530                 || proc == NLMPROC_TEST_RES
531                 || proc == NLMPROC_LOCK_RES
532                 || proc == NLMPROC_CANCEL_RES
533                 || proc == NLMPROC_UNLOCK_RES
534                 || proc == NLMPROC_NSM_NOTIFY;
535 }
536 
537 
538 static int lockd_authenticate(struct svc_rqst *rqstp)
539 {
540         rqstp->rq_client = NULL;
541         switch (rqstp->rq_authop->flavour) {
542                 case RPC_AUTH_NULL:
543                 case RPC_AUTH_UNIX:
544                         if (rqstp->rq_proc == 0)
545                                 return SVC_OK;
546                         if (is_callback(rqstp->rq_proc)) {
547                                 /* Leave it to individual procedures to
548                                  * call nlmsvc_lookup_host(rqstp)
549                                  */
550                                 return SVC_OK;
551                         }
552                         return svc_set_client(rqstp);
553         }
554         return SVC_DENIED;
555 }
556 
557 
558 param_set_min_max(port, int, simple_strtol, 0, 65535)
559 param_set_min_max(grace_period, unsigned long, simple_strtoul,
560                   nlm_grace_period_min, nlm_grace_period_max)
561 param_set_min_max(timeout, unsigned long, simple_strtoul,
562                   nlm_timeout_min, nlm_timeout_max)
563 
564 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
565 MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
566 MODULE_LICENSE("GPL");
567 
568 module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
569                   &nlm_grace_period, 0644);
570 module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
571                   &nlm_timeout, 0644);
572 module_param_call(nlm_udpport, param_set_port, param_get_int,
573                   &nlm_udpport, 0644);
574 module_param_call(nlm_tcpport, param_set_port, param_get_int,
575                   &nlm_tcpport, 0644);
576 module_param(nsm_use_hostnames, bool, 0644);
577 module_param(nlm_max_connections, uint, 0644);
578 
579 static int lockd_init_net(struct net *net)
580 {
581         struct lockd_net *ln = net_generic(net, lockd_net_id);
582 
583         INIT_DELAYED_WORK(&ln->grace_period_end, grace_ender);
584         INIT_LIST_HEAD(&ln->grace_list);
585         spin_lock_init(&ln->nsm_clnt_lock);
586         INIT_LIST_HEAD(&ln->nsm_handles);
587         return 0;
588 }
589 
590 static void lockd_exit_net(struct net *net)
591 {
592 }
593 
594 static struct pernet_operations lockd_net_ops = {
595         .init = lockd_init_net,
596         .exit = lockd_exit_net,
597         .id = &lockd_net_id,
598         .size = sizeof(struct lockd_net),
599 };
600 
601 
602 /*
603  * Initialising and terminating the module.
604  */
605 
606 static int __init init_nlm(void)
607 {
608         int err;
609 
610 #ifdef CONFIG_SYSCTL
611         err = -ENOMEM;
612         nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
613         if (nlm_sysctl_table == NULL)
614                 goto err_sysctl;
615 #endif
616         err = register_pernet_subsys(&lockd_net_ops);
617         if (err)
618                 goto err_pernet;
619         return 0;
620 
621 err_pernet:
622 #ifdef CONFIG_SYSCTL
623         unregister_sysctl_table(nlm_sysctl_table);
624 #endif
625 err_sysctl:
626         return err;
627 }
628 
629 static void __exit exit_nlm(void)
630 {
631         /* FIXME: delete all NLM clients */
632         nlm_shutdown_hosts();
633         unregister_pernet_subsys(&lockd_net_ops);
634 #ifdef CONFIG_SYSCTL
635         unregister_sysctl_table(nlm_sysctl_table);
636 #endif
637 }
638 
639 module_init(init_nlm);
640 module_exit(exit_nlm);
641 
642 /*
643  * Define NLM program and procedures
644  */
645 static struct svc_version       nlmsvc_version1 = {
646                 .vs_vers        = 1,
647                 .vs_nproc       = 17,
648                 .vs_proc        = nlmsvc_procedures,
649                 .vs_xdrsize     = NLMSVC_XDRSIZE,
650 };
651 static struct svc_version       nlmsvc_version3 = {
652                 .vs_vers        = 3,
653                 .vs_nproc       = 24,
654                 .vs_proc        = nlmsvc_procedures,
655                 .vs_xdrsize     = NLMSVC_XDRSIZE,
656 };
657 #ifdef CONFIG_LOCKD_V4
658 static struct svc_version       nlmsvc_version4 = {
659                 .vs_vers        = 4,
660                 .vs_nproc       = 24,
661                 .vs_proc        = nlmsvc_procedures4,
662                 .vs_xdrsize     = NLMSVC_XDRSIZE,
663 };
664 #endif
665 static struct svc_version *     nlmsvc_version[] = {
666         [1] = &nlmsvc_version1,
667         [3] = &nlmsvc_version3,
668 #ifdef CONFIG_LOCKD_V4
669         [4] = &nlmsvc_version4,
670 #endif
671 };
672 
673 static struct svc_stat          nlmsvc_stats;
674 
675 #define NLM_NRVERS      ARRAY_SIZE(nlmsvc_version)
676 static struct svc_program       nlmsvc_program = {
677         .pg_prog                = NLM_PROGRAM,          /* program number */
678         .pg_nvers               = NLM_NRVERS,           /* number of entries in nlmsvc_version */
679         .pg_vers                = nlmsvc_version,       /* version table */
680         .pg_name                = "lockd",              /* service name */
681         .pg_class               = "nfsd",               /* share authentication with nfsd */
682         .pg_stats               = &nlmsvc_stats,        /* stats table */
683         .pg_authenticate = &lockd_authenticate  /* export authentication */
684 };
685 

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