blob: 1a54ae14a192d551ff02d57a559c109709903c57 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#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>
Ingo Molnar353ab6e2006-03-26 01:37:12 -080027#include <linux/mutex.h>
Jeff Laytond751a7c2008-02-07 16:34:55 -050028#include <linux/kthread.h>
Rafael J. Wysocki83144182007-07-17 04:03:35 -070029#include <linux/freezer.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
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>
NeilBrown24e36662006-10-02 02:17:45 -070036#include <net/ip.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#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;
Trond Myklebust2de59872008-12-23 15:21:33 -050047EXPORT_SYMBOL_GPL(nlmsvc_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
Ingo Molnar353ab6e2006-03-26 01:37:12 -080049static DEFINE_MUTEX(nlmsvc_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070050static unsigned int nlmsvc_users;
Jeff Laytond751a7c2008-02-07 16:34:55 -050051static struct task_struct *nlmsvc_task;
Jeff Laytonabd1ec42008-06-11 10:03:12 -040052static struct svc_rqst *nlmsvc_rqst;
Linus Torvalds1da177e2005-04-16 15:20:36 -070053unsigned long nlmsvc_timeout;
54
Linus Torvalds1da177e2005-04-16 15:20:36 -070055/*
56 * These can be set at insmod time (useful for NFS as root filesystem),
57 * and also changed through the sysctl interface. -- Jamie Lokier, Aug 2003
58 */
59static unsigned long nlm_grace_period;
60static unsigned long nlm_timeout = LOCKD_DFLT_TIMEO;
61static int nlm_udpport, nlm_tcpport;
62
Jeff Laytonc72a4762008-10-20 11:51:58 -040063/* RLIM_NOFILE defaults to 1024. That seems like a reasonable default here. */
64static unsigned int nlm_max_connections = 1024;
65
Linus Torvalds1da177e2005-04-16 15:20:36 -070066/*
67 * Constants needed for the sysctl interface.
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
Chuck Lever90d5b182008-03-14 14:18:30 -040075#ifdef CONFIG_SYSCTL
Linus Torvalds1da177e2005-04-16 15:20:36 -070076static struct ctl_table_header * nlm_sysctl_table;
Chuck Lever90d5b182008-03-14 14:18:30 -040077#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
Marc Eshel9a8db972007-07-17 04:04:35 -070079static unsigned long get_lockd_grace_period(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070080{
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 /* Note: nlm_timeout should always be nonzero */
82 if (nlm_grace_period)
Marc Eshel9a8db972007-07-17 04:04:35 -070083 return roundup(nlm_grace_period, nlm_timeout) * HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 else
Marc Eshel9a8db972007-07-17 04:04:35 -070085 return nlm_timeout * 5 * HZ;
86}
87
J. Bruce Fieldsaf558e32007-09-06 12:34:25 -040088static struct lock_manager lockd_manager = {
89};
Marc Eshel9a8db972007-07-17 04:04:35 -070090
J. Bruce Fieldsc8ab5f22008-03-18 19:00:19 -040091static void grace_ender(struct work_struct *not_used)
Linus Torvalds1da177e2005-04-16 15:20:36 -070092{
J. Bruce Fieldsaf558e32007-09-06 12:34:25 -040093 locks_end_grace(&lockd_manager);
Linus Torvalds1da177e2005-04-16 15:20:36 -070094}
95
J. Bruce Fieldsc8ab5f22008-03-18 19:00:19 -040096static DECLARE_DELAYED_WORK(grace_period_end, grace_ender);
97
98static void set_grace_period(void)
99{
J. Bruce Fieldsaf558e32007-09-06 12:34:25 -0400100 unsigned long grace_period = get_lockd_grace_period();
J. Bruce Fieldsc8ab5f22008-03-18 19:00:19 -0400101
J. Bruce Fieldsaf558e32007-09-06 12:34:25 -0400102 locks_start_grace(&lockd_manager);
J. Bruce Fieldsc8ab5f22008-03-18 19:00:19 -0400103 cancel_delayed_work_sync(&grace_period_end);
104 schedule_delayed_work(&grace_period_end, grace_period);
105}
106
J. Bruce Fields89996df2009-05-06 16:32:54 -0400107static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117/*
118 * This is the lockd kernel thread
119 */
Jeff Laytond751a7c2008-02-07 16:34:55 -0500120static int
121lockd(void *vrqstp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122{
Jeff Laytonf97c6502008-04-08 15:40:08 -0400123 int err = 0, preverr = 0;
Jeff Laytond751a7c2008-02-07 16:34:55 -0500124 struct svc_rqst *rqstp = vrqstp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
Jeff Laytond751a7c2008-02-07 16:34:55 -0500126 /* try_to_freeze() is called from svc_recv() */
Rafael J. Wysocki83144182007-07-17 04:03:35 -0700127 set_freezable();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128
Jeff Laytond751a7c2008-02-07 16:34:55 -0500129 /* Allow SIGKILL to tell lockd to drop all of its locks */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 allow_signal(SIGKILL);
131
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
133
Jeff Laytond751a7c2008-02-07 16:34:55 -0500134 /*
135 * FIXME: it would be nice if lockd didn't spend its entire life
136 * running under the BKL. At the very least, it would be good to
137 * have someone clarify what it's intended to protect here. I've
138 * seen some handwavy posts about posix locking needing to be
139 * done under the BKL, but it's far from clear.
140 */
141 lock_kernel();
142
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 if (!nlm_timeout)
144 nlm_timeout = LOCKD_DFLT_TIMEO;
145 nlmsvc_timeout = nlm_timeout * HZ;
146
J. Bruce Fieldsc8ab5f22008-03-18 19:00:19 -0400147 set_grace_period();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
149 /*
150 * The main request loop. We don't terminate until the last
Jeff Laytond751a7c2008-02-07 16:34:55 -0500151 * NFS mount or NFS daemon has gone away.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 */
Jeff Laytond751a7c2008-02-07 16:34:55 -0500153 while (!kthread_should_stop()) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 long timeout = MAX_SCHEDULE_TIMEOUT;
Pavel Emelyanov5216a8e2008-02-21 10:57:45 +0300155 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156
Jeff Laytonc72a4762008-10-20 11:51:58 -0400157 /* update sv_maxconn if it has changed */
158 rqstp->rq_server->sv_maxconn = nlm_max_connections;
159
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 if (signalled()) {
161 flush_signals(current);
J. Bruce Fields89996df2009-05-06 16:32:54 -0400162 restart_grace();
Jeff Laytond751a7c2008-02-07 16:34:55 -0500163 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 }
165
J. Bruce Fields8fafa902008-01-24 11:11:34 -0500166 timeout = nlmsvc_retry_blocked();
167
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 /*
169 * Find a socket with data available and call its
170 * recvfrom routine.
171 */
NeilBrown6fb2b472006-10-02 02:17:50 -0700172 err = svc_recv(rqstp, timeout);
Jeff Laytonf97c6502008-04-08 15:40:08 -0400173 if (err == -EAGAIN || err == -EINTR) {
174 preverr = err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 }
Jeff Laytonf97c6502008-04-08 15:40:08 -0400177 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187
Chuck Leverad06e4b2007-02-12 00:53:32 -0800188 dprintk("lockd: request from %s\n",
189 svc_print_addr(rqstp, buf, sizeof(buf)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190
NeilBrown6fb2b472006-10-02 02:17:50 -0700191 svc_process(rqstp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 }
Trond Myklebust2bd61572006-01-03 09:55:19 +0100193 flush_signals(current);
J. Bruce Fieldsc8ab5f22008-03-18 19:00:19 -0400194 cancel_delayed_work_sync(&grace_period_end);
J. Bruce Fields2c5e7612008-11-20 14:36:17 -0600195 locks_end_grace(&lockd_manager);
Jeff Laytond751a7c2008-02-07 16:34:55 -0500196 if (nlmsvc_ops)
197 nlmsvc_invalidate_all();
198 nlm_shutdown_hosts();
Jeff Laytond751a7c2008-02-07 16:34:55 -0500199 unlock_kernel();
Jeff Laytond751a7c2008-02-07 16:34:55 -0500200 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201}
202
Chuck Levereb16e902009-03-18 20:47:59 -0400203static int create_lockd_listener(struct svc_serv *serv, const char *name,
204 const int family, const unsigned short port)
Chuck Leverd3fe5ea2008-12-31 16:06:04 -0500205{
206 struct svc_xprt *xprt;
207
Chuck Levereb16e902009-03-18 20:47:59 -0400208 xprt = svc_find_xprt(serv, name, family, 0);
Chuck Leverd3fe5ea2008-12-31 16:06:04 -0500209 if (xprt == NULL)
Chuck Levereb16e902009-03-18 20:47:59 -0400210 return svc_create_xprt(serv, name, family, port,
211 SVC_SOCK_DEFAULTS);
Chuck Leverd3fe5ea2008-12-31 16:06:04 -0500212 svc_xprt_put(xprt);
213 return 0;
214}
215
Chuck Levereb16e902009-03-18 20:47:59 -0400216static 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
Chuck Lever482fb942007-02-12 00:53:29 -0800227/*
Chuck Lever8c3916f2008-10-03 17:15:23 -0400228 * Ensure there are active UDP and TCP listeners for lockd.
229 *
230 * Even if we have only TCP NFS mounts and/or TCP NFSDs, some
231 * local services (such as rpc.statd) still require UDP, and
232 * some NFS servers do not yet support NLM over TCP.
233 *
234 * Returns zero if all listeners are available; otherwise a
235 * negative errno value is returned.
Chuck Lever482fb942007-02-12 00:53:29 -0800236 */
Chuck Lever8c3916f2008-10-03 17:15:23 -0400237static int make_socks(struct svc_serv *serv)
NeilBrown24e36662006-10-02 02:17:45 -0700238{
Chuck Lever482fb942007-02-12 00:53:29 -0800239 static int warned;
Chuck Lever0dba7c22008-12-31 16:06:11 -0500240 int err;
Chuck Lever482fb942007-02-12 00:53:29 -0800241
Chuck Levereb16e902009-03-18 20:47:59 -0400242 err = create_lockd_family(serv, PF_INET);
Chuck Lever0dba7c22008-12-31 16:06:11 -0500243 if (err < 0)
244 goto out_err;
245
Chuck Levereb16e902009-03-18 20:47:59 -0400246#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
247 err = create_lockd_family(serv, PF_INET6);
248 if (err < 0 && err != -EAFNOSUPPORT)
Chuck Lever0dba7c22008-12-31 16:06:11 -0500249 goto out_err;
Chuck Levereb16e902009-03-18 20:47:59 -0400250#endif /* CONFIG_IPV6 || CONFIG_IPV6_MODULE */
Chuck Lever0dba7c22008-12-31 16:06:11 -0500251
252 warned = 0;
253 return 0;
254
255out_err:
256 if (warned++ == 0)
NeilBrown7dcf91e2006-10-02 02:17:52 -0700257 printk(KERN_WARNING
Chuck Lever0dba7c22008-12-31 16:06:11 -0500258 "lockd_up: makesock failed, error=%d\n", err);
NeilBrown24e36662006-10-02 02:17:45 -0700259 return err;
260}
261
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262/*
263 * Bring up the lockd process if it's not already up.
264 */
Chuck Lever26a41402008-10-03 17:15:30 -0400265int lockd_up(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266{
Jeff Laytond751a7c2008-02-07 16:34:55 -0500267 struct svc_serv *serv;
Jeff Laytond751a7c2008-02-07 16:34:55 -0500268 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800270 mutex_lock(&nlmsvc_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 * Check whether we're already up and running.
273 */
Chuck Lever8c3916f2008-10-03 17:15:23 -0400274 if (nlmsvc_rqst)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 goto out;
276
277 /*
278 * Sanity check: if there's no pid,
279 * we should be the first user ...
280 */
NeilBrown4a3ae422006-10-02 02:17:53 -0700281 if (nlmsvc_users)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 printk(KERN_WARNING
283 "lockd_up: no pid, %d users??\n", nlmsvc_users);
284
285 error = -ENOMEM;
Chuck Lever49a90722009-03-18 20:46:29 -0400286 serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 if (!serv) {
288 printk(KERN_WARNING "lockd_up: create service failed\n");
289 goto out;
290 }
291
Chuck Lever8c3916f2008-10-03 17:15:23 -0400292 error = make_socks(serv);
293 if (error < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 goto destroy_and_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295
296 /*
297 * Create the kernel thread and wait for it to start.
298 */
Jeff Laytonabd1ec42008-06-11 10:03:12 -0400299 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 printk(KERN_WARNING
Jeff Laytond751a7c2008-02-07 16:34:55 -0500304 "lockd_up: svc_rqst allocation failed, error=%d\n",
305 error);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 goto destroy_and_out;
307 }
Jeff Laytond751a7c2008-02-07 16:34:55 -0500308
309 svc_sock_update_bufs(serv);
Jeff Laytonc72a4762008-10-20 11:51:58 -0400310 serv->sv_maxconn = nlm_max_connections;
Jeff Laytond751a7c2008-02-07 16:34:55 -0500311
Jeff Laytonabd1ec42008-06-11 10:03:12 -0400312 nlmsvc_task = kthread_run(lockd, nlmsvc_rqst, serv->sv_name);
Jeff Laytond751a7c2008-02-07 16:34:55 -0500313 if (IS_ERR(nlmsvc_task)) {
314 error = PTR_ERR(nlmsvc_task);
Jeff Laytonabd1ec42008-06-11 10:03:12 -0400315 svc_exit_thread(nlmsvc_rqst);
Jeff Laytond751a7c2008-02-07 16:34:55 -0500316 nlmsvc_task = NULL;
Jeff Laytonabd1ec42008-06-11 10:03:12 -0400317 nlmsvc_rqst = NULL;
Jeff Laytond751a7c2008-02-07 16:34:55 -0500318 printk(KERN_WARNING
319 "lockd_up: kthread_run failed, error=%d\n", error);
Jeff Laytond751a7c2008-02-07 16:34:55 -0500320 goto destroy_and_out;
321 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322
323 /*
324 * Note: svc_serv structures have an initial use count of 1,
325 * so we exit through here on both success and failure.
326 */
327destroy_and_out:
328 svc_destroy(serv);
329out:
NeilBrown4a3ae422006-10-02 02:17:53 -0700330 if (!error)
331 nlmsvc_users++;
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800332 mutex_unlock(&nlmsvc_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 return error;
334}
Trond Myklebust2de59872008-12-23 15:21:33 -0500335EXPORT_SYMBOL_GPL(lockd_up);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336
337/*
338 * Decrement the user count and bring down lockd if we're the last.
339 */
340void
341lockd_down(void)
342{
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800343 mutex_lock(&nlmsvc_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 if (nlmsvc_users) {
345 if (--nlmsvc_users)
346 goto out;
Jeff Laytond751a7c2008-02-07 16:34:55 -0500347 } else {
348 printk(KERN_ERR "lockd_down: no users! task=%p\n",
349 nlmsvc_task);
350 BUG();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352
Jeff Laytond751a7c2008-02-07 16:34:55 -0500353 if (!nlmsvc_task) {
354 printk(KERN_ERR "lockd_down: no lockd running.\n");
355 BUG();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 }
Jeff Laytond751a7c2008-02-07 16:34:55 -0500357 kthread_stop(nlmsvc_task);
Jeff Laytonabd1ec42008-06-11 10:03:12 -0400358 svc_exit_thread(nlmsvc_rqst);
359 nlmsvc_task = NULL;
360 nlmsvc_rqst = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361out:
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800362 mutex_unlock(&nlmsvc_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363}
Trond Myklebust2de59872008-12-23 15:21:33 -0500364EXPORT_SYMBOL_GPL(lockd_down);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365
Chuck Lever90d5b182008-03-14 14:18:30 -0400366#ifdef CONFIG_SYSCTL
367
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368/*
369 * Sysctl parameters (same as module parameters, different interface).
370 */
371
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372static ctl_table nlm_sysctls[] = {
373 {
374 .ctl_name = CTL_UNNUMBERED,
375 .procname = "nlm_grace_period",
376 .data = &nlm_grace_period,
Steve Dickson7ee91ec2005-07-13 01:10:47 -0700377 .maxlen = sizeof(unsigned long),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 .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,
Steve Dickson7ee91ec2005-07-13 01:10:47 -0700387 .maxlen = sizeof(unsigned long),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 .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 },
Olaf Kirchabd1f502006-10-04 02:16:01 -0700413 {
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 },
Olaf Kirch460f5ca2006-10-04 02:16:03 -0700421 {
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 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 { .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
Chuck Lever90d5b182008-03-14 14:18:30 -0400452#endif /* CONFIG_SYSCTL */
453
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454/*
Robert P. J. Day405ae7d2007-02-17 19:13:42 +0100455 * Module (and sysfs) parameters.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 */
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 /* Leave it to individual procedures to
491 * call nlmsvc_lookup_host(rqstp)
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);
Olaf Kirchabd1f502006-10-04 02:16:01 -0700519module_param(nsm_use_hostnames, bool, 0644);
Jeff Laytonc72a4762008-10-20 11:51:58 -0400520module_param(nlm_max_connections, uint, 0644);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
522/*
523 * Initialising and terminating the module.
524 */
525
526static int __init init_nlm(void)
527{
Chuck Lever90d5b182008-03-14 14:18:30 -0400528#ifdef CONFIG_SYSCTL
Eric W. Biederman0b4d4142007-02-14 00:34:09 -0800529 nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 return nlm_sysctl_table ? 0 : -ENOMEM;
Chuck Lever90d5b182008-03-14 14:18:30 -0400531#else
532 return 0;
533#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534}
535
536static void __exit exit_nlm(void)
537{
538 /* FIXME: delete all NLM clients */
539 nlm_shutdown_hosts();
Chuck Lever90d5b182008-03-14 14:18:30 -0400540#ifdef CONFIG_SYSCTL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 unregister_sysctl_table(nlm_sysctl_table);
Chuck Lever90d5b182008-03-14 14:18:30 -0400542#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543}
544
545module_init(init_nlm);
546module_exit(exit_nlm);
547
548/*
549 * Define NLM program and procedures
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
Tobias Klausere8c96f82006-03-24 03:15:34 -0800581#define NLM_NRVERS ARRAY_SIZE(nlmsvc_version)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582static struct svc_program nlmsvc_program = {
583 .pg_prog = NLM_PROGRAM, /* program number */
584 .pg_nvers = NLM_NRVERS, /* number of entries in nlmsvc_version */
585 .pg_vers = nlmsvc_version, /* version table */
586 .pg_name = "lockd", /* service name */
587 .pg_class = "nfsd", /* share authentication with nfsd */
588 .pg_stats = &nlmsvc_stats, /* stats table */
589 .pg_authenticate = &lockd_authenticate /* export authentication */
590};