blob: abf83881f68a762f736b1a99faa16aff669256af [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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107/*
108 * This is the lockd kernel thread
109 */
Jeff Laytond751a7c2008-02-07 16:34:55 -0500110static int
111lockd(void *vrqstp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112{
Jeff Laytonf97c6502008-04-08 15:40:08 -0400113 int err = 0, preverr = 0;
Jeff Laytond751a7c2008-02-07 16:34:55 -0500114 struct svc_rqst *rqstp = vrqstp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115
Jeff Laytond751a7c2008-02-07 16:34:55 -0500116 /* try_to_freeze() is called from svc_recv() */
Rafael J. Wysocki83144182007-07-17 04:03:35 -0700117 set_freezable();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
Jeff Laytond751a7c2008-02-07 16:34:55 -0500119 /* Allow SIGKILL to tell lockd to drop all of its locks */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 allow_signal(SIGKILL);
121
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
123
Jeff Laytond751a7c2008-02-07 16:34:55 -0500124 /*
125 * FIXME: it would be nice if lockd didn't spend its entire life
126 * running under the BKL. At the very least, it would be good to
127 * have someone clarify what it's intended to protect here. I've
128 * seen some handwavy posts about posix locking needing to be
129 * done under the BKL, but it's far from clear.
130 */
131 lock_kernel();
132
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 if (!nlm_timeout)
134 nlm_timeout = LOCKD_DFLT_TIMEO;
135 nlmsvc_timeout = nlm_timeout * HZ;
136
J. Bruce Fieldsc8ab5f22008-03-18 19:00:19 -0400137 set_grace_period();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
139 /*
140 * The main request loop. We don't terminate until the last
Jeff Laytond751a7c2008-02-07 16:34:55 -0500141 * NFS mount or NFS daemon has gone away.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 */
Jeff Laytond751a7c2008-02-07 16:34:55 -0500143 while (!kthread_should_stop()) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 long timeout = MAX_SCHEDULE_TIMEOUT;
Pavel Emelyanov5216a8e2008-02-21 10:57:45 +0300145 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146
Jeff Laytonc72a4762008-10-20 11:51:58 -0400147 /* update sv_maxconn if it has changed */
148 rqstp->rq_server->sv_maxconn = nlm_max_connections;
149
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 if (signalled()) {
151 flush_signals(current);
152 if (nlmsvc_ops) {
153 nlmsvc_invalidate_all();
J. Bruce Fieldsc8ab5f22008-03-18 19:00:19 -0400154 set_grace_period();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 }
Jeff Laytond751a7c2008-02-07 16:34:55 -0500156 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 }
158
J. Bruce Fields8fafa902008-01-24 11:11:34 -0500159 timeout = nlmsvc_retry_blocked();
160
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 /*
162 * Find a socket with data available and call its
163 * recvfrom routine.
164 */
NeilBrown6fb2b472006-10-02 02:17:50 -0700165 err = svc_recv(rqstp, timeout);
Jeff Laytonf97c6502008-04-08 15:40:08 -0400166 if (err == -EAGAIN || err == -EINTR) {
167 preverr = err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 }
Jeff Laytonf97c6502008-04-08 15:40:08 -0400170 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180
Chuck Leverad06e4b2007-02-12 00:53:32 -0800181 dprintk("lockd: request from %s\n",
182 svc_print_addr(rqstp, buf, sizeof(buf)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183
NeilBrown6fb2b472006-10-02 02:17:50 -0700184 svc_process(rqstp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 }
Trond Myklebust2bd61572006-01-03 09:55:19 +0100186 flush_signals(current);
J. Bruce Fieldsc8ab5f22008-03-18 19:00:19 -0400187 cancel_delayed_work_sync(&grace_period_end);
J. Bruce Fields2c5e7612008-11-20 14:36:17 -0600188 locks_end_grace(&lockd_manager);
Jeff Laytond751a7c2008-02-07 16:34:55 -0500189 if (nlmsvc_ops)
190 nlmsvc_invalidate_all();
191 nlm_shutdown_hosts();
Jeff Laytond751a7c2008-02-07 16:34:55 -0500192 unlock_kernel();
Jeff Laytond751a7c2008-02-07 16:34:55 -0500193 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194}
195
Chuck Levereb16e902009-03-18 20:47:59 -0400196static int create_lockd_listener(struct svc_serv *serv, const char *name,
197 const int family, const unsigned short port)
Chuck Leverd3fe5ea2008-12-31 16:06:04 -0500198{
199 struct svc_xprt *xprt;
200
Chuck Levereb16e902009-03-18 20:47:59 -0400201 xprt = svc_find_xprt(serv, name, family, 0);
Chuck Leverd3fe5ea2008-12-31 16:06:04 -0500202 if (xprt == NULL)
Chuck Levereb16e902009-03-18 20:47:59 -0400203 return svc_create_xprt(serv, name, family, port,
204 SVC_SOCK_DEFAULTS);
Chuck Leverd3fe5ea2008-12-31 16:06:04 -0500205 svc_xprt_put(xprt);
206 return 0;
207}
208
Chuck Levereb16e902009-03-18 20:47:59 -0400209static int create_lockd_family(struct svc_serv *serv, const int family)
210{
211 int err;
212
213 err = create_lockd_listener(serv, "udp", family, nlm_udpport);
214 if (err < 0)
215 return err;
216
217 return create_lockd_listener(serv, "tcp", family, nlm_tcpport);
218}
219
Chuck Lever482fb942007-02-12 00:53:29 -0800220/*
Chuck Lever8c3916f2008-10-03 17:15:23 -0400221 * Ensure there are active UDP and TCP listeners for lockd.
222 *
223 * Even if we have only TCP NFS mounts and/or TCP NFSDs, some
224 * local services (such as rpc.statd) still require UDP, and
225 * some NFS servers do not yet support NLM over TCP.
226 *
227 * Returns zero if all listeners are available; otherwise a
228 * negative errno value is returned.
Chuck Lever482fb942007-02-12 00:53:29 -0800229 */
Chuck Lever8c3916f2008-10-03 17:15:23 -0400230static int make_socks(struct svc_serv *serv)
NeilBrown24e36662006-10-02 02:17:45 -0700231{
Chuck Lever482fb942007-02-12 00:53:29 -0800232 static int warned;
Chuck Lever0dba7c22008-12-31 16:06:11 -0500233 int err;
Chuck Lever482fb942007-02-12 00:53:29 -0800234
Chuck Levereb16e902009-03-18 20:47:59 -0400235 err = create_lockd_family(serv, PF_INET);
Chuck Lever0dba7c22008-12-31 16:06:11 -0500236 if (err < 0)
237 goto out_err;
238
Chuck Levereb16e902009-03-18 20:47:59 -0400239#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
240 err = create_lockd_family(serv, PF_INET6);
241 if (err < 0 && err != -EAFNOSUPPORT)
Chuck Lever0dba7c22008-12-31 16:06:11 -0500242 goto out_err;
Chuck Levereb16e902009-03-18 20:47:59 -0400243#endif /* CONFIG_IPV6 || CONFIG_IPV6_MODULE */
Chuck Lever0dba7c22008-12-31 16:06:11 -0500244
245 warned = 0;
246 return 0;
247
248out_err:
249 if (warned++ == 0)
NeilBrown7dcf91e2006-10-02 02:17:52 -0700250 printk(KERN_WARNING
Chuck Lever0dba7c22008-12-31 16:06:11 -0500251 "lockd_up: makesock failed, error=%d\n", err);
NeilBrown24e36662006-10-02 02:17:45 -0700252 return err;
253}
254
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255/*
256 * Bring up the lockd process if it's not already up.
257 */
Chuck Lever26a41402008-10-03 17:15:30 -0400258int lockd_up(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259{
Jeff Laytond751a7c2008-02-07 16:34:55 -0500260 struct svc_serv *serv;
Jeff Laytond751a7c2008-02-07 16:34:55 -0500261 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800263 mutex_lock(&nlmsvc_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 * Check whether we're already up and running.
266 */
Chuck Lever8c3916f2008-10-03 17:15:23 -0400267 if (nlmsvc_rqst)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 goto out;
269
270 /*
271 * Sanity check: if there's no pid,
272 * we should be the first user ...
273 */
NeilBrown4a3ae422006-10-02 02:17:53 -0700274 if (nlmsvc_users)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 printk(KERN_WARNING
276 "lockd_up: no pid, %d users??\n", nlmsvc_users);
277
278 error = -ENOMEM;
Chuck Lever49a90722009-03-18 20:46:29 -0400279 serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 if (!serv) {
281 printk(KERN_WARNING "lockd_up: create service failed\n");
282 goto out;
283 }
284
Chuck Lever8c3916f2008-10-03 17:15:23 -0400285 error = make_socks(serv);
286 if (error < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 goto destroy_and_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288
289 /*
290 * Create the kernel thread and wait for it to start.
291 */
Jeff Laytonabd1ec42008-06-11 10:03:12 -0400292 nlmsvc_rqst = svc_prepare_thread(serv, &serv->sv_pools[0]);
293 if (IS_ERR(nlmsvc_rqst)) {
294 error = PTR_ERR(nlmsvc_rqst);
295 nlmsvc_rqst = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 printk(KERN_WARNING
Jeff Laytond751a7c2008-02-07 16:34:55 -0500297 "lockd_up: svc_rqst allocation failed, error=%d\n",
298 error);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 goto destroy_and_out;
300 }
Jeff Laytond751a7c2008-02-07 16:34:55 -0500301
302 svc_sock_update_bufs(serv);
Jeff Laytonc72a4762008-10-20 11:51:58 -0400303 serv->sv_maxconn = nlm_max_connections;
Jeff Laytond751a7c2008-02-07 16:34:55 -0500304
Jeff Laytonabd1ec42008-06-11 10:03:12 -0400305 nlmsvc_task = kthread_run(lockd, nlmsvc_rqst, serv->sv_name);
Jeff Laytond751a7c2008-02-07 16:34:55 -0500306 if (IS_ERR(nlmsvc_task)) {
307 error = PTR_ERR(nlmsvc_task);
Jeff Laytonabd1ec42008-06-11 10:03:12 -0400308 svc_exit_thread(nlmsvc_rqst);
Jeff Laytond751a7c2008-02-07 16:34:55 -0500309 nlmsvc_task = NULL;
Jeff Laytonabd1ec42008-06-11 10:03:12 -0400310 nlmsvc_rqst = NULL;
Jeff Laytond751a7c2008-02-07 16:34:55 -0500311 printk(KERN_WARNING
312 "lockd_up: kthread_run failed, error=%d\n", error);
Jeff Laytond751a7c2008-02-07 16:34:55 -0500313 goto destroy_and_out;
314 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315
316 /*
317 * Note: svc_serv structures have an initial use count of 1,
318 * so we exit through here on both success and failure.
319 */
320destroy_and_out:
321 svc_destroy(serv);
322out:
NeilBrown4a3ae422006-10-02 02:17:53 -0700323 if (!error)
324 nlmsvc_users++;
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800325 mutex_unlock(&nlmsvc_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 return error;
327}
Trond Myklebust2de59872008-12-23 15:21:33 -0500328EXPORT_SYMBOL_GPL(lockd_up);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
330/*
331 * Decrement the user count and bring down lockd if we're the last.
332 */
333void
334lockd_down(void)
335{
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800336 mutex_lock(&nlmsvc_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 if (nlmsvc_users) {
338 if (--nlmsvc_users)
339 goto out;
Jeff Laytond751a7c2008-02-07 16:34:55 -0500340 } else {
341 printk(KERN_ERR "lockd_down: no users! task=%p\n",
342 nlmsvc_task);
343 BUG();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345
Jeff Laytond751a7c2008-02-07 16:34:55 -0500346 if (!nlmsvc_task) {
347 printk(KERN_ERR "lockd_down: no lockd running.\n");
348 BUG();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 }
Jeff Laytond751a7c2008-02-07 16:34:55 -0500350 kthread_stop(nlmsvc_task);
Jeff Laytonabd1ec42008-06-11 10:03:12 -0400351 svc_exit_thread(nlmsvc_rqst);
352 nlmsvc_task = NULL;
353 nlmsvc_rqst = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354out:
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800355 mutex_unlock(&nlmsvc_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356}
Trond Myklebust2de59872008-12-23 15:21:33 -0500357EXPORT_SYMBOL_GPL(lockd_down);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358
Chuck Lever90d5b182008-03-14 14:18:30 -0400359#ifdef CONFIG_SYSCTL
360
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361/*
362 * Sysctl parameters (same as module parameters, different interface).
363 */
364
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365static ctl_table nlm_sysctls[] = {
366 {
367 .ctl_name = CTL_UNNUMBERED,
368 .procname = "nlm_grace_period",
369 .data = &nlm_grace_period,
Steve Dickson7ee91ec2005-07-13 01:10:47 -0700370 .maxlen = sizeof(unsigned long),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 .mode = 0644,
372 .proc_handler = &proc_doulongvec_minmax,
373 .extra1 = (unsigned long *) &nlm_grace_period_min,
374 .extra2 = (unsigned long *) &nlm_grace_period_max,
375 },
376 {
377 .ctl_name = CTL_UNNUMBERED,
378 .procname = "nlm_timeout",
379 .data = &nlm_timeout,
Steve Dickson7ee91ec2005-07-13 01:10:47 -0700380 .maxlen = sizeof(unsigned long),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 .mode = 0644,
382 .proc_handler = &proc_doulongvec_minmax,
383 .extra1 = (unsigned long *) &nlm_timeout_min,
384 .extra2 = (unsigned long *) &nlm_timeout_max,
385 },
386 {
387 .ctl_name = CTL_UNNUMBERED,
388 .procname = "nlm_udpport",
389 .data = &nlm_udpport,
390 .maxlen = sizeof(int),
391 .mode = 0644,
392 .proc_handler = &proc_dointvec_minmax,
393 .extra1 = (int *) &nlm_port_min,
394 .extra2 = (int *) &nlm_port_max,
395 },
396 {
397 .ctl_name = CTL_UNNUMBERED,
398 .procname = "nlm_tcpport",
399 .data = &nlm_tcpport,
400 .maxlen = sizeof(int),
401 .mode = 0644,
402 .proc_handler = &proc_dointvec_minmax,
403 .extra1 = (int *) &nlm_port_min,
404 .extra2 = (int *) &nlm_port_max,
405 },
Olaf Kirchabd1f502006-10-04 02:16:01 -0700406 {
407 .ctl_name = CTL_UNNUMBERED,
408 .procname = "nsm_use_hostnames",
409 .data = &nsm_use_hostnames,
410 .maxlen = sizeof(int),
411 .mode = 0644,
412 .proc_handler = &proc_dointvec,
413 },
Olaf Kirch460f5ca2006-10-04 02:16:03 -0700414 {
415 .ctl_name = CTL_UNNUMBERED,
416 .procname = "nsm_local_state",
417 .data = &nsm_local_state,
418 .maxlen = sizeof(int),
419 .mode = 0644,
420 .proc_handler = &proc_dointvec,
421 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 { .ctl_name = 0 }
423};
424
425static ctl_table nlm_sysctl_dir[] = {
426 {
427 .ctl_name = CTL_UNNUMBERED,
428 .procname = "nfs",
429 .mode = 0555,
430 .child = nlm_sysctls,
431 },
432 { .ctl_name = 0 }
433};
434
435static ctl_table nlm_sysctl_root[] = {
436 {
437 .ctl_name = CTL_FS,
438 .procname = "fs",
439 .mode = 0555,
440 .child = nlm_sysctl_dir,
441 },
442 { .ctl_name = 0 }
443};
444
Chuck Lever90d5b182008-03-14 14:18:30 -0400445#endif /* CONFIG_SYSCTL */
446
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447/*
Robert P. J. Day405ae7d2007-02-17 19:13:42 +0100448 * Module (and sysfs) parameters.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 */
450
451#define param_set_min_max(name, type, which_strtol, min, max) \
452static int param_set_##name(const char *val, struct kernel_param *kp) \
453{ \
454 char *endp; \
455 __typeof__(type) num = which_strtol(val, &endp, 0); \
456 if (endp == val || *endp || num < (min) || num > (max)) \
457 return -EINVAL; \
458 *((int *) kp->arg) = num; \
459 return 0; \
460}
461
462static inline int is_callback(u32 proc)
463{
464 return proc == NLMPROC_GRANTED
465 || proc == NLMPROC_GRANTED_MSG
466 || proc == NLMPROC_TEST_RES
467 || proc == NLMPROC_LOCK_RES
468 || proc == NLMPROC_CANCEL_RES
469 || proc == NLMPROC_UNLOCK_RES
470 || proc == NLMPROC_NSM_NOTIFY;
471}
472
473
474static int lockd_authenticate(struct svc_rqst *rqstp)
475{
476 rqstp->rq_client = NULL;
477 switch (rqstp->rq_authop->flavour) {
478 case RPC_AUTH_NULL:
479 case RPC_AUTH_UNIX:
480 if (rqstp->rq_proc == 0)
481 return SVC_OK;
482 if (is_callback(rqstp->rq_proc)) {
483 /* Leave it to individual procedures to
484 * call nlmsvc_lookup_host(rqstp)
485 */
486 return SVC_OK;
487 }
488 return svc_set_client(rqstp);
489 }
490 return SVC_DENIED;
491}
492
493
494param_set_min_max(port, int, simple_strtol, 0, 65535)
495param_set_min_max(grace_period, unsigned long, simple_strtoul,
496 nlm_grace_period_min, nlm_grace_period_max)
497param_set_min_max(timeout, unsigned long, simple_strtoul,
498 nlm_timeout_min, nlm_timeout_max)
499
500MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
501MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
502MODULE_LICENSE("GPL");
503
504module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
505 &nlm_grace_period, 0644);
506module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
507 &nlm_timeout, 0644);
508module_param_call(nlm_udpport, param_set_port, param_get_int,
509 &nlm_udpport, 0644);
510module_param_call(nlm_tcpport, param_set_port, param_get_int,
511 &nlm_tcpport, 0644);
Olaf Kirchabd1f502006-10-04 02:16:01 -0700512module_param(nsm_use_hostnames, bool, 0644);
Jeff Laytonc72a4762008-10-20 11:51:58 -0400513module_param(nlm_max_connections, uint, 0644);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514
515/*
516 * Initialising and terminating the module.
517 */
518
519static int __init init_nlm(void)
520{
Chuck Lever90d5b182008-03-14 14:18:30 -0400521#ifdef CONFIG_SYSCTL
Eric W. Biederman0b4d4142007-02-14 00:34:09 -0800522 nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 return nlm_sysctl_table ? 0 : -ENOMEM;
Chuck Lever90d5b182008-03-14 14:18:30 -0400524#else
525 return 0;
526#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527}
528
529static void __exit exit_nlm(void)
530{
531 /* FIXME: delete all NLM clients */
532 nlm_shutdown_hosts();
Chuck Lever90d5b182008-03-14 14:18:30 -0400533#ifdef CONFIG_SYSCTL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 unregister_sysctl_table(nlm_sysctl_table);
Chuck Lever90d5b182008-03-14 14:18:30 -0400535#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536}
537
538module_init(init_nlm);
539module_exit(exit_nlm);
540
541/*
542 * Define NLM program and procedures
543 */
544static struct svc_version nlmsvc_version1 = {
545 .vs_vers = 1,
546 .vs_nproc = 17,
547 .vs_proc = nlmsvc_procedures,
548 .vs_xdrsize = NLMSVC_XDRSIZE,
549};
550static struct svc_version nlmsvc_version3 = {
551 .vs_vers = 3,
552 .vs_nproc = 24,
553 .vs_proc = nlmsvc_procedures,
554 .vs_xdrsize = NLMSVC_XDRSIZE,
555};
556#ifdef CONFIG_LOCKD_V4
557static struct svc_version nlmsvc_version4 = {
558 .vs_vers = 4,
559 .vs_nproc = 24,
560 .vs_proc = nlmsvc_procedures4,
561 .vs_xdrsize = NLMSVC_XDRSIZE,
562};
563#endif
564static struct svc_version * nlmsvc_version[] = {
565 [1] = &nlmsvc_version1,
566 [3] = &nlmsvc_version3,
567#ifdef CONFIG_LOCKD_V4
568 [4] = &nlmsvc_version4,
569#endif
570};
571
572static struct svc_stat nlmsvc_stats;
573
Tobias Klausere8c96f82006-03-24 03:15:34 -0800574#define NLM_NRVERS ARRAY_SIZE(nlmsvc_version)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575static struct svc_program nlmsvc_program = {
576 .pg_prog = NLM_PROGRAM, /* program number */
577 .pg_nvers = NLM_NRVERS, /* number of entries in nlmsvc_version */
578 .pg_vers = nlmsvc_version, /* version table */
579 .pg_name = "lockd", /* service name */
580 .pg_class = "nfsd", /* share authentication with nfsd */
581 .pg_stats = &nlmsvc_stats, /* stats table */
582 .pg_authenticate = &lockd_authenticate /* export authentication */
583};