1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/fs/lockd/svc.c
4 *
5 * This is the central lockd service.
6 *
7 * FIXME: Separate the lockd NFS server functionality from the lockd NFS
8 * client functionality. Oh why didn't Sun create two separate
9 * services in the first place?
10 *
11 * Authors: Olaf Kirch (okir@monad.swb.de)
12 *
13 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
14 */
15
16 #include <linux/module.h>
17 #include <linux/init.h>
18 #include <linux/sysctl.h>
19 #include <linux/moduleparam.h>
20
21 #include <linux/sched/signal.h>
22 #include <linux/errno.h>
23 #include <linux/in.h>
24 #include <linux/uio.h>
25 #include <linux/smp.h>
26 #include <linux/mutex.h>
27 #include <linux/kthread.h>
28 #include <linux/freezer.h>
29 #include <linux/inetdevice.h>
30
31 #include <linux/sunrpc/types.h>
32 #include <linux/sunrpc/stats.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/svc.h>
35 #include <linux/sunrpc/svcsock.h>
36 #include <linux/sunrpc/svc_xprt.h>
37 #include <net/ip.h>
38 #include <net/addrconf.h>
39 #include <net/ipv6.h>
40 #include <linux/lockd/lockd.h>
41 #include <linux/nfs.h>
42
43 #include "netns.h"
44 #include "procfs.h"
45
46 #define NLMDBG_FACILITY NLMDBG_SVC
47 #define LOCKD_BUFSIZE (1024 + NLMSVC_XDRSIZE)
48 #define ALLOWED_SIGS (sigmask(SIGKILL))
49
50 static struct svc_program nlmsvc_program;
51
52 const struct nlmsvc_binding *nlmsvc_ops;
53 EXPORT_SYMBOL_GPL(nlmsvc_ops);
54
55 static DEFINE_MUTEX(nlmsvc_mutex);
56 static unsigned int nlmsvc_users;
57 static struct svc_serv *nlmsvc_serv;
58 unsigned long nlmsvc_timeout;
59
60 unsigned int lockd_net_id;
61
62 /*
63 * These can be set at insmod time (useful for NFS as root filesystem),
64 * and also changed through the sysctl interface. -- Jamie Lokier, Aug 2003
65 */
66 static unsigned long nlm_grace_period;
67 static unsigned long nlm_timeout = LOCKD_DFLT_TIMEO;
68 static int nlm_udpport, nlm_tcpport;
69
70 /* RLIM_NOFILE defaults to 1024. That seems like a reasonable default here. */
71 static unsigned int nlm_max_connections = 1024;
72
73 /*
74 * Constants needed for the sysctl interface.
75 */
76 static const unsigned long nlm_grace_period_min = 0;
77 static const unsigned long nlm_grace_period_max = 240;
78 static const unsigned long nlm_timeout_min = 3;
79 static const unsigned long nlm_timeout_max = 20;
80 static const int nlm_port_min = 0, nlm_port_max = 65535;
81
82 #ifdef CONFIG_SYSCTL
83 static struct ctl_table_header * nlm_sysctl_table;
84 #endif
85
get_lockd_grace_period(void)86 static unsigned long get_lockd_grace_period(void)
87 {
88 /* Note: nlm_timeout should always be nonzero */
89 if (nlm_grace_period)
90 return roundup(nlm_grace_period, nlm_timeout) * HZ;
91 else
92 return nlm_timeout * 5 * HZ;
93 }
94
grace_ender(struct work_struct * grace)95 static void grace_ender(struct work_struct *grace)
96 {
97 struct delayed_work *dwork = to_delayed_work(grace);
98 struct lockd_net *ln = container_of(dwork, struct lockd_net,
99 grace_period_end);
100
101 locks_end_grace(&ln->lockd_manager);
102 }
103
set_grace_period(struct net * net)104 static void set_grace_period(struct net *net)
105 {
106 unsigned long grace_period = get_lockd_grace_period();
107 struct lockd_net *ln = net_generic(net, lockd_net_id);
108
109 locks_start_grace(net, &ln->lockd_manager);
110 cancel_delayed_work_sync(&ln->grace_period_end);
111 schedule_delayed_work(&ln->grace_period_end, grace_period);
112 }
113
restart_grace(void)114 static void restart_grace(void)
115 {
116 if (nlmsvc_ops) {
117 struct net *net = &init_net;
118 struct lockd_net *ln = net_generic(net, lockd_net_id);
119
120 cancel_delayed_work_sync(&ln->grace_period_end);
121 locks_end_grace(&ln->lockd_manager);
122 nlmsvc_invalidate_all();
123 set_grace_period(net);
124 }
125 }
126
127 /*
128 * This is the lockd kernel thread
129 */
130 static int
lockd(void * vrqstp)131 lockd(void *vrqstp)
132 {
133 int err = 0;
134 struct svc_rqst *rqstp = vrqstp;
135 struct net *net = &init_net;
136 struct lockd_net *ln = net_generic(net, lockd_net_id);
137
138 /* try_to_freeze() is called from svc_recv() */
139 set_freezable();
140
141 /* Allow SIGKILL to tell lockd to drop all of its locks */
142 allow_signal(SIGKILL);
143
144 dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
145
146 /*
147 * The main request loop. We don't terminate until the last
148 * NFS mount or NFS daemon has gone away.
149 */
150 while (!kthread_should_stop()) {
151 long timeout = MAX_SCHEDULE_TIMEOUT;
152 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
153
154 /* update sv_maxconn if it has changed */
155 rqstp->rq_server->sv_maxconn = nlm_max_connections;
156
157 if (signalled()) {
158 flush_signals(current);
159 restart_grace();
160 continue;
161 }
162
163 timeout = nlmsvc_retry_blocked();
164
165 /*
166 * Find a socket with data available and call its
167 * recvfrom routine.
168 */
169 err = svc_recv(rqstp, timeout);
170 if (err == -EAGAIN || err == -EINTR)
171 continue;
172 dprintk("lockd: request from %s\n",
173 svc_print_addr(rqstp, buf, sizeof(buf)));
174
175 svc_process(rqstp);
176 }
177 flush_signals(current);
178 if (nlmsvc_ops)
179 nlmsvc_invalidate_all();
180 nlm_shutdown_hosts();
181 cancel_delayed_work_sync(&ln->grace_period_end);
182 locks_end_grace(&ln->lockd_manager);
183
184 dprintk("lockd_down: service stopped\n");
185
186 svc_exit_thread(rqstp);
187 return 0;
188 }
189
create_lockd_listener(struct svc_serv * serv,const char * name,struct net * net,const int family,const unsigned short port,const struct cred * cred)190 static int create_lockd_listener(struct svc_serv *serv, const char *name,
191 struct net *net, const int family,
192 const unsigned short port,
193 const struct cred *cred)
194 {
195 struct svc_xprt *xprt;
196
197 xprt = svc_find_xprt(serv, name, net, family, 0);
198 if (xprt == NULL)
199 return svc_xprt_create(serv, name, net, family, port,
200 SVC_SOCK_DEFAULTS, cred);
201 svc_xprt_put(xprt);
202 return 0;
203 }
204
create_lockd_family(struct svc_serv * serv,struct net * net,const int family,const struct cred * cred)205 static int create_lockd_family(struct svc_serv *serv, struct net *net,
206 const int family, const struct cred *cred)
207 {
208 int err;
209
210 err = create_lockd_listener(serv, "udp", net, family, nlm_udpport,
211 cred);
212 if (err < 0)
213 return err;
214
215 return create_lockd_listener(serv, "tcp", net, family, nlm_tcpport,
216 cred);
217 }
218
219 /*
220 * Ensure there are active UDP and TCP listeners for lockd.
221 *
222 * Even if we have only TCP NFS mounts and/or TCP NFSDs, some
223 * local services (such as rpc.statd) still require UDP, and
224 * some NFS servers do not yet support NLM over TCP.
225 *
226 * Returns zero if all listeners are available; otherwise a
227 * negative errno value is returned.
228 */
make_socks(struct svc_serv * serv,struct net * net,const struct cred * cred)229 static int make_socks(struct svc_serv *serv, struct net *net,
230 const struct cred *cred)
231 {
232 static int warned;
233 int err;
234
235 err = create_lockd_family(serv, net, PF_INET, cred);
236 if (err < 0)
237 goto out_err;
238
239 err = create_lockd_family(serv, net, PF_INET6, cred);
240 if (err < 0 && err != -EAFNOSUPPORT)
241 goto out_err;
242
243 warned = 0;
244 return 0;
245
246 out_err:
247 if (warned++ == 0)
248 printk(KERN_WARNING
249 "lockd_up: makesock failed, error=%d\n", err);
250 svc_xprt_destroy_all(serv, net);
251 svc_rpcb_cleanup(serv, net);
252 return err;
253 }
254
lockd_up_net(struct svc_serv * serv,struct net * net,const struct cred * cred)255 static int lockd_up_net(struct svc_serv *serv, struct net *net,
256 const struct cred *cred)
257 {
258 struct lockd_net *ln = net_generic(net, lockd_net_id);
259 int error;
260
261 if (ln->nlmsvc_users++)
262 return 0;
263
264 error = svc_bind(serv, net);
265 if (error)
266 goto err_bind;
267
268 error = make_socks(serv, net, cred);
269 if (error < 0)
270 goto err_bind;
271 set_grace_period(net);
272 dprintk("%s: per-net data created; net=%x\n", __func__, net->ns.inum);
273 return 0;
274
275 err_bind:
276 ln->nlmsvc_users--;
277 return error;
278 }
279
lockd_down_net(struct svc_serv * serv,struct net * net)280 static void lockd_down_net(struct svc_serv *serv, struct net *net)
281 {
282 struct lockd_net *ln = net_generic(net, lockd_net_id);
283
284 if (ln->nlmsvc_users) {
285 if (--ln->nlmsvc_users == 0) {
286 nlm_shutdown_hosts_net(net);
287 cancel_delayed_work_sync(&ln->grace_period_end);
288 locks_end_grace(&ln->lockd_manager);
289 svc_xprt_destroy_all(serv, net);
290 svc_rpcb_cleanup(serv, net);
291 }
292 } else {
293 pr_err("%s: no users! net=%x\n",
294 __func__, net->ns.inum);
295 BUG();
296 }
297 }
298
lockd_inetaddr_event(struct notifier_block * this,unsigned long event,void * ptr)299 static int lockd_inetaddr_event(struct notifier_block *this,
300 unsigned long event, void *ptr)
301 {
302 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
303 struct sockaddr_in sin;
304
305 if (event != NETDEV_DOWN)
306 goto out;
307
308 if (nlmsvc_serv) {
309 dprintk("lockd_inetaddr_event: removed %pI4\n",
310 &ifa->ifa_local);
311 sin.sin_family = AF_INET;
312 sin.sin_addr.s_addr = ifa->ifa_local;
313 svc_age_temp_xprts_now(nlmsvc_serv, (struct sockaddr *)&sin);
314 }
315
316 out:
317 return NOTIFY_DONE;
318 }
319
320 static struct notifier_block lockd_inetaddr_notifier = {
321 .notifier_call = lockd_inetaddr_event,
322 };
323
324 #if IS_ENABLED(CONFIG_IPV6)
lockd_inet6addr_event(struct notifier_block * this,unsigned long event,void * ptr)325 static int lockd_inet6addr_event(struct notifier_block *this,
326 unsigned long event, void *ptr)
327 {
328 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
329 struct sockaddr_in6 sin6;
330
331 if (event != NETDEV_DOWN)
332 goto out;
333
334 if (nlmsvc_serv) {
335 dprintk("lockd_inet6addr_event: removed %pI6\n", &ifa->addr);
336 sin6.sin6_family = AF_INET6;
337 sin6.sin6_addr = ifa->addr;
338 if (ipv6_addr_type(&sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
339 sin6.sin6_scope_id = ifa->idev->dev->ifindex;
340 svc_age_temp_xprts_now(nlmsvc_serv, (struct sockaddr *)&sin6);
341 }
342
343 out:
344 return NOTIFY_DONE;
345 }
346
347 static struct notifier_block lockd_inet6addr_notifier = {
348 .notifier_call = lockd_inet6addr_event,
349 };
350 #endif
351
lockd_get(void)352 static int lockd_get(void)
353 {
354 struct svc_serv *serv;
355 int error;
356
357 if (nlmsvc_serv) {
358 svc_get(nlmsvc_serv);
359 nlmsvc_users++;
360 return 0;
361 }
362
363 /*
364 * Sanity check: if there's no pid,
365 * we should be the first user ...
366 */
367 if (nlmsvc_users)
368 printk(KERN_WARNING
369 "lockd_up: no pid, %d users??\n", nlmsvc_users);
370
371 if (!nlm_timeout)
372 nlm_timeout = LOCKD_DFLT_TIMEO;
373 nlmsvc_timeout = nlm_timeout * HZ;
374
375 serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, lockd);
376 if (!serv) {
377 printk(KERN_WARNING "lockd_up: create service failed\n");
378 return -ENOMEM;
379 }
380
381 serv->sv_maxconn = nlm_max_connections;
382 error = svc_set_num_threads(serv, NULL, 1);
383 /* The thread now holds the only reference */
384 svc_put(serv);
385 if (error < 0)
386 return error;
387
388 nlmsvc_serv = serv;
389 register_inetaddr_notifier(&lockd_inetaddr_notifier);
390 #if IS_ENABLED(CONFIG_IPV6)
391 register_inet6addr_notifier(&lockd_inet6addr_notifier);
392 #endif
393 dprintk("lockd_up: service created\n");
394 nlmsvc_users++;
395 return 0;
396 }
397
lockd_put(void)398 static void lockd_put(void)
399 {
400 if (WARN(nlmsvc_users <= 0, "lockd_down: no users!\n"))
401 return;
402 if (--nlmsvc_users)
403 return;
404
405 unregister_inetaddr_notifier(&lockd_inetaddr_notifier);
406 #if IS_ENABLED(CONFIG_IPV6)
407 unregister_inet6addr_notifier(&lockd_inet6addr_notifier);
408 #endif
409
410 svc_set_num_threads(nlmsvc_serv, NULL, 0);
411 nlmsvc_serv = NULL;
412 dprintk("lockd_down: service destroyed\n");
413 }
414
415 /*
416 * Bring up the lockd process if it's not already up.
417 */
lockd_up(struct net * net,const struct cred * cred)418 int lockd_up(struct net *net, const struct cred *cred)
419 {
420 int error;
421
422 mutex_lock(&nlmsvc_mutex);
423
424 error = lockd_get();
425 if (error)
426 goto err;
427
428 error = lockd_up_net(nlmsvc_serv, net, cred);
429 if (error < 0) {
430 lockd_put();
431 goto err;
432 }
433
434 err:
435 mutex_unlock(&nlmsvc_mutex);
436 return error;
437 }
438 EXPORT_SYMBOL_GPL(lockd_up);
439
440 /*
441 * Decrement the user count and bring down lockd if we're the last.
442 */
443 void
lockd_down(struct net * net)444 lockd_down(struct net *net)
445 {
446 mutex_lock(&nlmsvc_mutex);
447 lockd_down_net(nlmsvc_serv, net);
448 lockd_put();
449 mutex_unlock(&nlmsvc_mutex);
450 }
451 EXPORT_SYMBOL_GPL(lockd_down);
452
453 #ifdef CONFIG_SYSCTL
454
455 /*
456 * Sysctl parameters (same as module parameters, different interface).
457 */
458
459 static struct ctl_table nlm_sysctls[] = {
460 {
461 .procname = "nlm_grace_period",
462 .data = &nlm_grace_period,
463 .maxlen = sizeof(unsigned long),
464 .mode = 0644,
465 .proc_handler = proc_doulongvec_minmax,
466 .extra1 = (unsigned long *) &nlm_grace_period_min,
467 .extra2 = (unsigned long *) &nlm_grace_period_max,
468 },
469 {
470 .procname = "nlm_timeout",
471 .data = &nlm_timeout,
472 .maxlen = sizeof(unsigned long),
473 .mode = 0644,
474 .proc_handler = proc_doulongvec_minmax,
475 .extra1 = (unsigned long *) &nlm_timeout_min,
476 .extra2 = (unsigned long *) &nlm_timeout_max,
477 },
478 {
479 .procname = "nlm_udpport",
480 .data = &nlm_udpport,
481 .maxlen = sizeof(int),
482 .mode = 0644,
483 .proc_handler = proc_dointvec_minmax,
484 .extra1 = (int *) &nlm_port_min,
485 .extra2 = (int *) &nlm_port_max,
486 },
487 {
488 .procname = "nlm_tcpport",
489 .data = &nlm_tcpport,
490 .maxlen = sizeof(int),
491 .mode = 0644,
492 .proc_handler = proc_dointvec_minmax,
493 .extra1 = (int *) &nlm_port_min,
494 .extra2 = (int *) &nlm_port_max,
495 },
496 {
497 .procname = "nsm_use_hostnames",
498 .data = &nsm_use_hostnames,
499 .maxlen = sizeof(int),
500 .mode = 0644,
501 .proc_handler = proc_dobool,
502 },
503 {
504 .procname = "nsm_local_state",
505 .data = &nsm_local_state,
506 .maxlen = sizeof(int),
507 .mode = 0644,
508 .proc_handler = proc_dointvec,
509 },
510 { }
511 };
512
513 static struct ctl_table nlm_sysctl_dir[] = {
514 {
515 .procname = "nfs",
516 .mode = 0555,
517 .child = nlm_sysctls,
518 },
519 { }
520 };
521
522 static struct ctl_table nlm_sysctl_root[] = {
523 {
524 .procname = "fs",
525 .mode = 0555,
526 .child = nlm_sysctl_dir,
527 },
528 { }
529 };
530
531 #endif /* CONFIG_SYSCTL */
532
533 /*
534 * Module (and sysfs) parameters.
535 */
536
537 #define param_set_min_max(name, type, which_strtol, min, max) \
538 static int param_set_##name(const char *val, const struct kernel_param *kp) \
539 { \
540 char *endp; \
541 __typeof__(type) num = which_strtol(val, &endp, 0); \
542 if (endp == val || *endp || num < (min) || num > (max)) \
543 return -EINVAL; \
544 *((type *) kp->arg) = num; \
545 return 0; \
546 }
547
is_callback(u32 proc)548 static inline int is_callback(u32 proc)
549 {
550 return proc == NLMPROC_GRANTED
551 || proc == NLMPROC_GRANTED_MSG
552 || proc == NLMPROC_TEST_RES
553 || proc == NLMPROC_LOCK_RES
554 || proc == NLMPROC_CANCEL_RES
555 || proc == NLMPROC_UNLOCK_RES
556 || proc == NLMPROC_NSM_NOTIFY;
557 }
558
559
lockd_authenticate(struct svc_rqst * rqstp)560 static int lockd_authenticate(struct svc_rqst *rqstp)
561 {
562 rqstp->rq_client = NULL;
563 switch (rqstp->rq_authop->flavour) {
564 case RPC_AUTH_NULL:
565 case RPC_AUTH_UNIX:
566 rqstp->rq_auth_stat = rpc_auth_ok;
567 if (rqstp->rq_proc == 0)
568 return SVC_OK;
569 if (is_callback(rqstp->rq_proc)) {
570 /* Leave it to individual procedures to
571 * call nlmsvc_lookup_host(rqstp)
572 */
573 return SVC_OK;
574 }
575 return svc_set_client(rqstp);
576 }
577 rqstp->rq_auth_stat = rpc_autherr_badcred;
578 return SVC_DENIED;
579 }
580
581
582 param_set_min_max(port, int, simple_strtol, 0, 65535)
583 param_set_min_max(grace_period, unsigned long, simple_strtoul,
584 nlm_grace_period_min, nlm_grace_period_max)
585 param_set_min_max(timeout, unsigned long, simple_strtoul,
586 nlm_timeout_min, nlm_timeout_max)
587
588 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
589 MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
590 MODULE_LICENSE("GPL");
591
592 module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
593 &nlm_grace_period, 0644);
594 module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
595 &nlm_timeout, 0644);
596 module_param_call(nlm_udpport, param_set_port, param_get_int,
597 &nlm_udpport, 0644);
598 module_param_call(nlm_tcpport, param_set_port, param_get_int,
599 &nlm_tcpport, 0644);
600 module_param(nsm_use_hostnames, bool, 0644);
601 module_param(nlm_max_connections, uint, 0644);
602
lockd_init_net(struct net * net)603 static int lockd_init_net(struct net *net)
604 {
605 struct lockd_net *ln = net_generic(net, lockd_net_id);
606
607 INIT_DELAYED_WORK(&ln->grace_period_end, grace_ender);
608 INIT_LIST_HEAD(&ln->lockd_manager.list);
609 ln->lockd_manager.block_opens = false;
610 INIT_LIST_HEAD(&ln->nsm_handles);
611 return 0;
612 }
613
lockd_exit_net(struct net * net)614 static void lockd_exit_net(struct net *net)
615 {
616 struct lockd_net *ln = net_generic(net, lockd_net_id);
617
618 WARN_ONCE(!list_empty(&ln->lockd_manager.list),
619 "net %x %s: lockd_manager.list is not empty\n",
620 net->ns.inum, __func__);
621 WARN_ONCE(!list_empty(&ln->nsm_handles),
622 "net %x %s: nsm_handles list is not empty\n",
623 net->ns.inum, __func__);
624 WARN_ONCE(delayed_work_pending(&ln->grace_period_end),
625 "net %x %s: grace_period_end was not cancelled\n",
626 net->ns.inum, __func__);
627 }
628
629 static struct pernet_operations lockd_net_ops = {
630 .init = lockd_init_net,
631 .exit = lockd_exit_net,
632 .id = &lockd_net_id,
633 .size = sizeof(struct lockd_net),
634 };
635
636
637 /*
638 * Initialising and terminating the module.
639 */
640
init_nlm(void)641 static int __init init_nlm(void)
642 {
643 int err;
644
645 #ifdef CONFIG_SYSCTL
646 err = -ENOMEM;
647 nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
648 if (nlm_sysctl_table == NULL)
649 goto err_sysctl;
650 #endif
651 err = register_pernet_subsys(&lockd_net_ops);
652 if (err)
653 goto err_pernet;
654
655 err = lockd_create_procfs();
656 if (err)
657 goto err_procfs;
658
659 return 0;
660
661 err_procfs:
662 unregister_pernet_subsys(&lockd_net_ops);
663 err_pernet:
664 #ifdef CONFIG_SYSCTL
665 unregister_sysctl_table(nlm_sysctl_table);
666 err_sysctl:
667 #endif
668 return err;
669 }
670
exit_nlm(void)671 static void __exit exit_nlm(void)
672 {
673 /* FIXME: delete all NLM clients */
674 nlm_shutdown_hosts();
675 lockd_remove_procfs();
676 unregister_pernet_subsys(&lockd_net_ops);
677 #ifdef CONFIG_SYSCTL
678 unregister_sysctl_table(nlm_sysctl_table);
679 #endif
680 }
681
682 module_init(init_nlm);
683 module_exit(exit_nlm);
684
685 /**
686 * nlmsvc_dispatch - Process an NLM Request
687 * @rqstp: incoming request
688 * @statp: pointer to location of accept_stat field in RPC Reply buffer
689 *
690 * Return values:
691 * %0: Processing complete; do not send a Reply
692 * %1: Processing complete; send Reply in rqstp->rq_res
693 */
nlmsvc_dispatch(struct svc_rqst * rqstp,__be32 * statp)694 static int nlmsvc_dispatch(struct svc_rqst *rqstp, __be32 *statp)
695 {
696 const struct svc_procedure *procp = rqstp->rq_procinfo;
697
698 svcxdr_init_decode(rqstp);
699 if (!procp->pc_decode(rqstp, &rqstp->rq_arg_stream))
700 goto out_decode_err;
701
702 *statp = procp->pc_func(rqstp);
703 if (*statp == rpc_drop_reply)
704 return 0;
705 if (*statp != rpc_success)
706 return 1;
707
708 svcxdr_init_encode(rqstp);
709 if (!procp->pc_encode(rqstp, &rqstp->rq_res_stream))
710 goto out_encode_err;
711
712 return 1;
713
714 out_decode_err:
715 *statp = rpc_garbage_args;
716 return 1;
717
718 out_encode_err:
719 *statp = rpc_system_err;
720 return 1;
721 }
722
723 /*
724 * Define NLM program and procedures
725 */
726 static unsigned int nlmsvc_version1_count[17];
727 static const struct svc_version nlmsvc_version1 = {
728 .vs_vers = 1,
729 .vs_nproc = 17,
730 .vs_proc = nlmsvc_procedures,
731 .vs_count = nlmsvc_version1_count,
732 .vs_dispatch = nlmsvc_dispatch,
733 .vs_xdrsize = NLMSVC_XDRSIZE,
734 };
735 static unsigned int nlmsvc_version3_count[24];
736 static const struct svc_version nlmsvc_version3 = {
737 .vs_vers = 3,
738 .vs_nproc = 24,
739 .vs_proc = nlmsvc_procedures,
740 .vs_count = nlmsvc_version3_count,
741 .vs_dispatch = nlmsvc_dispatch,
742 .vs_xdrsize = NLMSVC_XDRSIZE,
743 };
744 #ifdef CONFIG_LOCKD_V4
745 static unsigned int nlmsvc_version4_count[24];
746 static const struct svc_version nlmsvc_version4 = {
747 .vs_vers = 4,
748 .vs_nproc = 24,
749 .vs_proc = nlmsvc_procedures4,
750 .vs_count = nlmsvc_version4_count,
751 .vs_dispatch = nlmsvc_dispatch,
752 .vs_xdrsize = NLMSVC_XDRSIZE,
753 };
754 #endif
755 static const struct svc_version *nlmsvc_version[] = {
756 [1] = &nlmsvc_version1,
757 [3] = &nlmsvc_version3,
758 #ifdef CONFIG_LOCKD_V4
759 [4] = &nlmsvc_version4,
760 #endif
761 };
762
763 static struct svc_stat nlmsvc_stats;
764
765 #define NLM_NRVERS ARRAY_SIZE(nlmsvc_version)
766 static struct svc_program nlmsvc_program = {
767 .pg_prog = NLM_PROGRAM, /* program number */
768 .pg_nvers = NLM_NRVERS, /* number of entries in nlmsvc_version */
769 .pg_vers = nlmsvc_version, /* version table */
770 .pg_name = "lockd", /* service name */
771 .pg_class = "nfsd", /* share authentication with nfsd */
772 .pg_stats = &nlmsvc_stats, /* stats table */
773 .pg_authenticate = &lockd_authenticate, /* export authentication */
774 .pg_init_request = svc_generic_init_request,
775 .pg_rpcbind_set = svc_generic_rpcbind_set,
776 };
777