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Commit | Line | Data |
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1da177e4 LT |
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 | ||
1da177e4 LT |
15 | #include <linux/module.h> |
16 | #include <linux/init.h> | |
17 | #include <linux/sysctl.h> | |
18 | #include <linux/moduleparam.h> | |
19 | ||
3f07c014 | 20 | #include <linux/sched/signal.h> |
1da177e4 LT |
21 | #include <linux/errno.h> |
22 | #include <linux/in.h> | |
23 | #include <linux/uio.h> | |
1da177e4 | 24 | #include <linux/smp.h> |
353ab6e9 | 25 | #include <linux/mutex.h> |
d751a7cd | 26 | #include <linux/kthread.h> |
83144186 | 27 | #include <linux/freezer.h> |
0751ddf7 | 28 | #include <linux/inetdevice.h> |
1da177e4 LT |
29 | |
30 | #include <linux/sunrpc/types.h> | |
31 | #include <linux/sunrpc/stats.h> | |
32 | #include <linux/sunrpc/clnt.h> | |
33 | #include <linux/sunrpc/svc.h> | |
34 | #include <linux/sunrpc/svcsock.h> | |
0751ddf7 | 35 | #include <linux/sunrpc/svc_xprt.h> |
24e36663 | 36 | #include <net/ip.h> |
0751ddf7 SM |
37 | #include <net/addrconf.h> |
38 | #include <net/ipv6.h> | |
1da177e4 LT |
39 | #include <linux/lockd/lockd.h> |
40 | #include <linux/nfs.h> | |
41 | ||
a9c5d73a | 42 | #include "netns.h" |
d68e3c4a | 43 | #include "procfs.h" |
a9c5d73a | 44 | |
1da177e4 LT |
45 | #define NLMDBG_FACILITY NLMDBG_SVC |
46 | #define LOCKD_BUFSIZE (1024 + NLMSVC_XDRSIZE) | |
47 | #define ALLOWED_SIGS (sigmask(SIGKILL)) | |
48 | ||
49 | static struct svc_program nlmsvc_program; | |
50 | ||
2a297450 | 51 | const struct nlmsvc_binding *nlmsvc_ops; |
2de59872 | 52 | EXPORT_SYMBOL_GPL(nlmsvc_ops); |
1da177e4 | 53 | |
353ab6e9 | 54 | static DEFINE_MUTEX(nlmsvc_mutex); |
1da177e4 | 55 | static unsigned int nlmsvc_users; |
d751a7cd | 56 | static struct task_struct *nlmsvc_task; |
abd1ec4e | 57 | static struct svc_rqst *nlmsvc_rqst; |
1da177e4 LT |
58 | unsigned long nlmsvc_timeout; |
59 | ||
554faf28 CIK |
60 | static atomic_t nlm_ntf_refcnt = ATOMIC_INIT(0); |
61 | static DECLARE_WAIT_QUEUE_HEAD(nlm_ntf_wq); | |
6b18dd1c | 62 | |
c7d03a00 | 63 | unsigned int lockd_net_id; |
a9c5d73a | 64 | |
1da177e4 LT |
65 | /* |
66 | * These can be set at insmod time (useful for NFS as root filesystem), | |
67 | * and also changed through the sysctl interface. -- Jamie Lokier, Aug 2003 | |
68 | */ | |
69 | static unsigned long nlm_grace_period; | |
70 | static unsigned long nlm_timeout = LOCKD_DFLT_TIMEO; | |
71 | static int nlm_udpport, nlm_tcpport; | |
72 | ||
c72a476b JL |
73 | /* RLIM_NOFILE defaults to 1024. That seems like a reasonable default here. */ |
74 | static unsigned int nlm_max_connections = 1024; | |
75 | ||
1da177e4 LT |
76 | /* |
77 | * Constants needed for the sysctl interface. | |
78 | */ | |
79 | static const unsigned long nlm_grace_period_min = 0; | |
80 | static const unsigned long nlm_grace_period_max = 240; | |
81 | static const unsigned long nlm_timeout_min = 3; | |
82 | static const unsigned long nlm_timeout_max = 20; | |
83 | static const int nlm_port_min = 0, nlm_port_max = 65535; | |
84 | ||
90d5b180 | 85 | #ifdef CONFIG_SYSCTL |
1da177e4 | 86 | static struct ctl_table_header * nlm_sysctl_table; |
90d5b180 | 87 | #endif |
1da177e4 | 88 | |
9a8db97e | 89 | static unsigned long get_lockd_grace_period(void) |
1da177e4 | 90 | { |
1da177e4 LT |
91 | /* Note: nlm_timeout should always be nonzero */ |
92 | if (nlm_grace_period) | |
9a8db97e | 93 | return roundup(nlm_grace_period, nlm_timeout) * HZ; |
1da177e4 | 94 | else |
9a8db97e ME |
95 | return nlm_timeout * 5 * HZ; |
96 | } | |
97 | ||
08d44a35 | 98 | static void grace_ender(struct work_struct *grace) |
9a8db97e | 99 | { |
ea44463f | 100 | struct delayed_work *dwork = to_delayed_work(grace); |
08d44a35 SK |
101 | struct lockd_net *ln = container_of(dwork, struct lockd_net, |
102 | grace_period_end); | |
103 | ||
104 | locks_end_grace(&ln->lockd_manager); | |
1da177e4 LT |
105 | } |
106 | ||
5ccb0066 | 107 | static void set_grace_period(struct net *net) |
1da177e4 | 108 | { |
af558e33 | 109 | unsigned long grace_period = get_lockd_grace_period(); |
5ccb0066 | 110 | struct lockd_net *ln = net_generic(net, lockd_net_id); |
c8ab5f2a | 111 | |
5ccb0066 | 112 | locks_start_grace(net, &ln->lockd_manager); |
66547b02 SK |
113 | cancel_delayed_work_sync(&ln->grace_period_end); |
114 | schedule_delayed_work(&ln->grace_period_end, grace_period); | |
1da177e4 LT |
115 | } |
116 | ||
89996df4 BF |
117 | static void restart_grace(void) |
118 | { | |
119 | if (nlmsvc_ops) { | |
5ccb0066 SK |
120 | struct net *net = &init_net; |
121 | struct lockd_net *ln = net_generic(net, lockd_net_id); | |
66547b02 SK |
122 | |
123 | cancel_delayed_work_sync(&ln->grace_period_end); | |
08d44a35 | 124 | locks_end_grace(&ln->lockd_manager); |
89996df4 | 125 | nlmsvc_invalidate_all(); |
5ccb0066 | 126 | set_grace_period(net); |
89996df4 BF |
127 | } |
128 | } | |
129 | ||
1da177e4 LT |
130 | /* |
131 | * This is the lockd kernel thread | |
132 | */ | |
d751a7cd JL |
133 | static int |
134 | lockd(void *vrqstp) | |
1da177e4 | 135 | { |
5b444cc9 | 136 | int err = 0; |
d751a7cd | 137 | struct svc_rqst *rqstp = vrqstp; |
efda760f BF |
138 | struct net *net = &init_net; |
139 | struct lockd_net *ln = net_generic(net, lockd_net_id); | |
1da177e4 | 140 | |
d751a7cd | 141 | /* try_to_freeze() is called from svc_recv() */ |
83144186 | 142 | set_freezable(); |
1da177e4 | 143 | |
d751a7cd | 144 | /* Allow SIGKILL to tell lockd to drop all of its locks */ |
1da177e4 LT |
145 | allow_signal(SIGKILL); |
146 | ||
1da177e4 LT |
147 | dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n"); |
148 | ||
1da177e4 LT |
149 | /* |
150 | * The main request loop. We don't terminate until the last | |
d751a7cd | 151 | * NFS mount or NFS daemon has gone away. |
1da177e4 | 152 | */ |
d751a7cd | 153 | while (!kthread_should_stop()) { |
1da177e4 | 154 | long timeout = MAX_SCHEDULE_TIMEOUT; |
5216a8e7 | 155 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 | 156 | |
c72a476b JL |
157 | /* update sv_maxconn if it has changed */ |
158 | rqstp->rq_server->sv_maxconn = nlm_max_connections; | |
159 | ||
1da177e4 LT |
160 | if (signalled()) { |
161 | flush_signals(current); | |
89996df4 | 162 | restart_grace(); |
d751a7cd | 163 | continue; |
1da177e4 LT |
164 | } |
165 | ||
8fafa900 BF |
166 | timeout = nlmsvc_retry_blocked(); |
167 | ||
1da177e4 LT |
168 | /* |
169 | * Find a socket with data available and call its | |
170 | * recvfrom routine. | |
171 | */ | |
6fb2b47f | 172 | err = svc_recv(rqstp, timeout); |
5b444cc9 | 173 | if (err == -EAGAIN || err == -EINTR) |
1da177e4 | 174 | continue; |
ad06e4bd CL |
175 | dprintk("lockd: request from %s\n", |
176 | svc_print_addr(rqstp, buf, sizeof(buf))); | |
1da177e4 | 177 | |
6fb2b47f | 178 | svc_process(rqstp); |
1da177e4 | 179 | } |
2bd61579 | 180 | flush_signals(current); |
d751a7cd JL |
181 | if (nlmsvc_ops) |
182 | nlmsvc_invalidate_all(); | |
183 | nlm_shutdown_hosts(); | |
efda760f BF |
184 | cancel_delayed_work_sync(&ln->grace_period_end); |
185 | locks_end_grace(&ln->lockd_manager); | |
d751a7cd | 186 | return 0; |
1da177e4 LT |
187 | } |
188 | ||
eb16e907 | 189 | static int create_lockd_listener(struct svc_serv *serv, const char *name, |
c228fa20 SK |
190 | struct net *net, const int family, |
191 | const unsigned short port) | |
d3fe5ea7 | 192 | { |
4df493a2 | 193 | const struct cred *cred = current_cred(); |
d3fe5ea7 CL |
194 | struct svc_xprt *xprt; |
195 | ||
c228fa20 | 196 | xprt = svc_find_xprt(serv, name, net, family, 0); |
d3fe5ea7 | 197 | if (xprt == NULL) |
c228fa20 | 198 | return svc_create_xprt(serv, name, net, family, port, |
4df493a2 | 199 | SVC_SOCK_DEFAULTS, cred); |
d3fe5ea7 CL |
200 | svc_xprt_put(xprt); |
201 | return 0; | |
202 | } | |
203 | ||
c228fa20 SK |
204 | static int create_lockd_family(struct svc_serv *serv, struct net *net, |
205 | const int family) | |
eb16e907 CL |
206 | { |
207 | int err; | |
208 | ||
c228fa20 | 209 | err = create_lockd_listener(serv, "udp", net, family, nlm_udpport); |
eb16e907 CL |
210 | if (err < 0) |
211 | return err; | |
212 | ||
c228fa20 | 213 | return create_lockd_listener(serv, "tcp", net, family, nlm_tcpport); |
eb16e907 CL |
214 | } |
215 | ||
482fb94e | 216 | /* |
8c3916f4 CL |
217 | * Ensure there are active UDP and TCP listeners for lockd. |
218 | * | |
219 | * Even if we have only TCP NFS mounts and/or TCP NFSDs, some | |
220 | * local services (such as rpc.statd) still require UDP, and | |
221 | * some NFS servers do not yet support NLM over TCP. | |
222 | * | |
223 | * Returns zero if all listeners are available; otherwise a | |
224 | * negative errno value is returned. | |
482fb94e | 225 | */ |
c228fa20 | 226 | static int make_socks(struct svc_serv *serv, struct net *net) |
24e36663 | 227 | { |
482fb94e | 228 | static int warned; |
0dba7c2a | 229 | int err; |
482fb94e | 230 | |
c228fa20 | 231 | err = create_lockd_family(serv, net, PF_INET); |
0dba7c2a CL |
232 | if (err < 0) |
233 | goto out_err; | |
234 | ||
c228fa20 | 235 | err = create_lockd_family(serv, net, PF_INET6); |
eb16e907 | 236 | if (err < 0 && err != -EAFNOSUPPORT) |
0dba7c2a CL |
237 | goto out_err; |
238 | ||
239 | warned = 0; | |
240 | return 0; | |
241 | ||
242 | out_err: | |
243 | if (warned++ == 0) | |
7dcf91ec | 244 | printk(KERN_WARNING |
0dba7c2a | 245 | "lockd_up: makesock failed, error=%d\n", err); |
679b033d | 246 | svc_shutdown_net(serv, net); |
24e36663 N |
247 | return err; |
248 | } | |
249 | ||
4db77695 | 250 | static int lockd_up_net(struct svc_serv *serv, struct net *net) |
bb2224df SK |
251 | { |
252 | struct lockd_net *ln = net_generic(net, lockd_net_id); | |
bb2224df SK |
253 | int error; |
254 | ||
786185b5 | 255 | if (ln->nlmsvc_users++) |
bb2224df SK |
256 | return 0; |
257 | ||
dbf9b5d7 | 258 | error = svc_bind(serv, net); |
bb2224df | 259 | if (error) |
dbf9b5d7 | 260 | goto err_bind; |
bb2224df SK |
261 | |
262 | error = make_socks(serv, net); | |
263 | if (error < 0) | |
7c17705e | 264 | goto err_bind; |
5630f7fa | 265 | set_grace_period(net); |
e919b076 | 266 | dprintk("%s: per-net data created; net=%x\n", __func__, net->ns.inum); |
bb2224df SK |
267 | return 0; |
268 | ||
dbf9b5d7 | 269 | err_bind: |
786185b5 | 270 | ln->nlmsvc_users--; |
bb2224df SK |
271 | return error; |
272 | } | |
273 | ||
4db77695 | 274 | static void lockd_down_net(struct svc_serv *serv, struct net *net) |
bb2224df SK |
275 | { |
276 | struct lockd_net *ln = net_generic(net, lockd_net_id); | |
bb2224df SK |
277 | |
278 | if (ln->nlmsvc_users) { | |
3b64739f SK |
279 | if (--ln->nlmsvc_users == 0) { |
280 | nlm_shutdown_hosts_net(net); | |
3a2b19d1 VA |
281 | cancel_delayed_work_sync(&ln->grace_period_end); |
282 | locks_end_grace(&ln->lockd_manager); | |
bb2224df | 283 | svc_shutdown_net(serv, net); |
e919b076 VA |
284 | dprintk("%s: per-net data destroyed; net=%x\n", |
285 | __func__, net->ns.inum); | |
3b64739f | 286 | } |
bb2224df | 287 | } else { |
e919b076 VA |
288 | pr_err("%s: no users! task=%p, net=%x\n", |
289 | __func__, nlmsvc_task, net->ns.inum); | |
bb2224df SK |
290 | BUG(); |
291 | } | |
292 | } | |
293 | ||
0751ddf7 SM |
294 | static int lockd_inetaddr_event(struct notifier_block *this, |
295 | unsigned long event, void *ptr) | |
296 | { | |
297 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; | |
298 | struct sockaddr_in sin; | |
299 | ||
6b18dd1c VA |
300 | if ((event != NETDEV_DOWN) || |
301 | !atomic_inc_not_zero(&nlm_ntf_refcnt)) | |
0751ddf7 SM |
302 | goto out; |
303 | ||
304 | if (nlmsvc_rqst) { | |
305 | dprintk("lockd_inetaddr_event: removed %pI4\n", | |
306 | &ifa->ifa_local); | |
307 | sin.sin_family = AF_INET; | |
308 | sin.sin_addr.s_addr = ifa->ifa_local; | |
309 | svc_age_temp_xprts_now(nlmsvc_rqst->rq_server, | |
310 | (struct sockaddr *)&sin); | |
311 | } | |
6b18dd1c VA |
312 | atomic_dec(&nlm_ntf_refcnt); |
313 | wake_up(&nlm_ntf_wq); | |
0751ddf7 SM |
314 | |
315 | out: | |
316 | return NOTIFY_DONE; | |
317 | } | |
318 | ||
319 | static struct notifier_block lockd_inetaddr_notifier = { | |
320 | .notifier_call = lockd_inetaddr_event, | |
321 | }; | |
322 | ||
323 | #if IS_ENABLED(CONFIG_IPV6) | |
324 | static int lockd_inet6addr_event(struct notifier_block *this, | |
325 | unsigned long event, void *ptr) | |
326 | { | |
327 | struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr; | |
328 | struct sockaddr_in6 sin6; | |
329 | ||
6b18dd1c VA |
330 | if ((event != NETDEV_DOWN) || |
331 | !atomic_inc_not_zero(&nlm_ntf_refcnt)) | |
0751ddf7 SM |
332 | goto out; |
333 | ||
334 | if (nlmsvc_rqst) { | |
335 | dprintk("lockd_inet6addr_event: removed %pI6\n", &ifa->addr); | |
336 | sin6.sin6_family = AF_INET6; | |
337 | sin6.sin6_addr = ifa->addr; | |
c01410f7 SM |
338 | if (ipv6_addr_type(&sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL) |
339 | sin6.sin6_scope_id = ifa->idev->dev->ifindex; | |
0751ddf7 SM |
340 | svc_age_temp_xprts_now(nlmsvc_rqst->rq_server, |
341 | (struct sockaddr *)&sin6); | |
342 | } | |
6b18dd1c VA |
343 | atomic_dec(&nlm_ntf_refcnt); |
344 | wake_up(&nlm_ntf_wq); | |
0751ddf7 SM |
345 | |
346 | out: | |
347 | return NOTIFY_DONE; | |
348 | } | |
349 | ||
350 | static struct notifier_block lockd_inet6addr_notifier = { | |
351 | .notifier_call = lockd_inet6addr_event, | |
352 | }; | |
353 | #endif | |
354 | ||
cb7d224f | 355 | static void lockd_unregister_notifiers(void) |
0751ddf7 SM |
356 | { |
357 | unregister_inetaddr_notifier(&lockd_inetaddr_notifier); | |
358 | #if IS_ENABLED(CONFIG_IPV6) | |
359 | unregister_inet6addr_notifier(&lockd_inet6addr_notifier); | |
360 | #endif | |
6b18dd1c | 361 | wait_event(nlm_ntf_wq, atomic_read(&nlm_ntf_refcnt) == 0); |
cb7d224f SM |
362 | } |
363 | ||
364 | static void lockd_svc_exit_thread(void) | |
365 | { | |
6b18dd1c | 366 | atomic_dec(&nlm_ntf_refcnt); |
cb7d224f | 367 | lockd_unregister_notifiers(); |
0751ddf7 SM |
368 | svc_exit_thread(nlmsvc_rqst); |
369 | } | |
370 | ||
3d1221df SK |
371 | static int lockd_start_svc(struct svc_serv *serv) |
372 | { | |
373 | int error; | |
374 | ||
375 | if (nlmsvc_rqst) | |
376 | return 0; | |
377 | ||
378 | /* | |
379 | * Create the kernel thread and wait for it to start. | |
380 | */ | |
381 | nlmsvc_rqst = svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE); | |
382 | if (IS_ERR(nlmsvc_rqst)) { | |
383 | error = PTR_ERR(nlmsvc_rqst); | |
384 | printk(KERN_WARNING | |
385 | "lockd_up: svc_rqst allocation failed, error=%d\n", | |
386 | error); | |
dc3033e1 | 387 | lockd_unregister_notifiers(); |
3d1221df SK |
388 | goto out_rqst; |
389 | } | |
390 | ||
6b18dd1c | 391 | atomic_inc(&nlm_ntf_refcnt); |
3d1221df SK |
392 | svc_sock_update_bufs(serv); |
393 | serv->sv_maxconn = nlm_max_connections; | |
394 | ||
d4e89902 | 395 | nlmsvc_task = kthread_create(lockd, nlmsvc_rqst, "%s", serv->sv_name); |
3d1221df SK |
396 | if (IS_ERR(nlmsvc_task)) { |
397 | error = PTR_ERR(nlmsvc_task); | |
398 | printk(KERN_WARNING | |
399 | "lockd_up: kthread_run failed, error=%d\n", error); | |
400 | goto out_task; | |
401 | } | |
d6a7ce42 | 402 | nlmsvc_rqst->rq_task = nlmsvc_task; |
d4e89902 | 403 | wake_up_process(nlmsvc_task); |
d6a7ce42 | 404 | |
3d1221df SK |
405 | dprintk("lockd_up: service started\n"); |
406 | return 0; | |
407 | ||
408 | out_task: | |
0751ddf7 | 409 | lockd_svc_exit_thread(); |
3d1221df SK |
410 | nlmsvc_task = NULL; |
411 | out_rqst: | |
412 | nlmsvc_rqst = NULL; | |
413 | return error; | |
414 | } | |
415 | ||
afea5657 | 416 | static const struct svc_serv_ops lockd_sv_ops = { |
b9e13cdf JL |
417 | .svo_shutdown = svc_rpcb_cleanup, |
418 | .svo_enqueue_xprt = svc_xprt_do_enqueue, | |
ea126e74 JL |
419 | }; |
420 | ||
24452239 | 421 | static struct svc_serv *lockd_create_svc(void) |
1da177e4 | 422 | { |
d751a7cd | 423 | struct svc_serv *serv; |
1da177e4 | 424 | |
1da177e4 LT |
425 | /* |
426 | * Check whether we're already up and running. | |
427 | */ | |
bb2224df | 428 | if (nlmsvc_rqst) { |
24452239 SK |
429 | /* |
430 | * Note: increase service usage, because later in case of error | |
431 | * svc_destroy() will be called. | |
432 | */ | |
433 | svc_get(nlmsvc_rqst->rq_server); | |
434 | return nlmsvc_rqst->rq_server; | |
bb2224df | 435 | } |
1da177e4 LT |
436 | |
437 | /* | |
438 | * Sanity check: if there's no pid, | |
439 | * we should be the first user ... | |
440 | */ | |
4a3ae42d | 441 | if (nlmsvc_users) |
1da177e4 LT |
442 | printk(KERN_WARNING |
443 | "lockd_up: no pid, %d users??\n", nlmsvc_users); | |
444 | ||
06bed7d1 TM |
445 | if (!nlm_timeout) |
446 | nlm_timeout = LOCKD_DFLT_TIMEO; | |
447 | nlmsvc_timeout = nlm_timeout * HZ; | |
448 | ||
ea126e74 | 449 | serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, &lockd_sv_ops); |
1da177e4 LT |
450 | if (!serv) { |
451 | printk(KERN_WARNING "lockd_up: create service failed\n"); | |
24452239 SK |
452 | return ERR_PTR(-ENOMEM); |
453 | } | |
0751ddf7 SM |
454 | register_inetaddr_notifier(&lockd_inetaddr_notifier); |
455 | #if IS_ENABLED(CONFIG_IPV6) | |
456 | register_inet6addr_notifier(&lockd_inet6addr_notifier); | |
457 | #endif | |
8dbf28e4 | 458 | dprintk("lockd_up: service created\n"); |
24452239 SK |
459 | return serv; |
460 | } | |
461 | ||
462 | /* | |
463 | * Bring up the lockd process if it's not already up. | |
464 | */ | |
465 | int lockd_up(struct net *net) | |
466 | { | |
467 | struct svc_serv *serv; | |
7d13ec76 | 468 | int error; |
24452239 SK |
469 | |
470 | mutex_lock(&nlmsvc_mutex); | |
471 | ||
472 | serv = lockd_create_svc(); | |
473 | if (IS_ERR(serv)) { | |
474 | error = PTR_ERR(serv); | |
475 | goto err_create; | |
1da177e4 LT |
476 | } |
477 | ||
dbf9b5d7 | 478 | error = lockd_up_net(serv, net); |
dc3033e1 VA |
479 | if (error < 0) { |
480 | lockd_unregister_notifiers(); | |
481 | goto err_put; | |
482 | } | |
1da177e4 | 483 | |
3d1221df | 484 | error = lockd_start_svc(serv); |
dc3033e1 VA |
485 | if (error < 0) { |
486 | lockd_down_net(serv, net); | |
487 | goto err_put; | |
488 | } | |
7d13ec76 | 489 | nlmsvc_users++; |
1da177e4 LT |
490 | /* |
491 | * Note: svc_serv structures have an initial use count of 1, | |
492 | * so we exit through here on both success and failure. | |
493 | */ | |
cb7d224f | 494 | err_put: |
1da177e4 | 495 | svc_destroy(serv); |
24452239 | 496 | err_create: |
353ab6e9 | 497 | mutex_unlock(&nlmsvc_mutex); |
1da177e4 LT |
498 | return error; |
499 | } | |
2de59872 | 500 | EXPORT_SYMBOL_GPL(lockd_up); |
1da177e4 LT |
501 | |
502 | /* | |
503 | * Decrement the user count and bring down lockd if we're the last. | |
504 | */ | |
505 | void | |
e3f70ead | 506 | lockd_down(struct net *net) |
1da177e4 | 507 | { |
353ab6e9 | 508 | mutex_lock(&nlmsvc_mutex); |
4db77695 | 509 | lockd_down_net(nlmsvc_rqst->rq_server, net); |
1da177e4 | 510 | if (nlmsvc_users) { |
786185b5 | 511 | if (--nlmsvc_users) |
1da177e4 | 512 | goto out; |
d751a7cd JL |
513 | } else { |
514 | printk(KERN_ERR "lockd_down: no users! task=%p\n", | |
515 | nlmsvc_task); | |
516 | BUG(); | |
1da177e4 | 517 | } |
1da177e4 | 518 | |
d751a7cd JL |
519 | if (!nlmsvc_task) { |
520 | printk(KERN_ERR "lockd_down: no lockd running.\n"); | |
521 | BUG(); | |
1da177e4 | 522 | } |
d751a7cd | 523 | kthread_stop(nlmsvc_task); |
8dbf28e4 | 524 | dprintk("lockd_down: service stopped\n"); |
0751ddf7 | 525 | lockd_svc_exit_thread(); |
8dbf28e4 | 526 | dprintk("lockd_down: service destroyed\n"); |
abd1ec4e JL |
527 | nlmsvc_task = NULL; |
528 | nlmsvc_rqst = NULL; | |
1da177e4 | 529 | out: |
353ab6e9 | 530 | mutex_unlock(&nlmsvc_mutex); |
1da177e4 | 531 | } |
2de59872 | 532 | EXPORT_SYMBOL_GPL(lockd_down); |
1da177e4 | 533 | |
90d5b180 CL |
534 | #ifdef CONFIG_SYSCTL |
535 | ||
1da177e4 LT |
536 | /* |
537 | * Sysctl parameters (same as module parameters, different interface). | |
538 | */ | |
539 | ||
7ac9fe57 | 540 | static struct ctl_table nlm_sysctls[] = { |
1da177e4 | 541 | { |
1da177e4 LT |
542 | .procname = "nlm_grace_period", |
543 | .data = &nlm_grace_period, | |
7ee91ec1 | 544 | .maxlen = sizeof(unsigned long), |
1da177e4 | 545 | .mode = 0644, |
6d456111 | 546 | .proc_handler = proc_doulongvec_minmax, |
1da177e4 LT |
547 | .extra1 = (unsigned long *) &nlm_grace_period_min, |
548 | .extra2 = (unsigned long *) &nlm_grace_period_max, | |
549 | }, | |
550 | { | |
1da177e4 LT |
551 | .procname = "nlm_timeout", |
552 | .data = &nlm_timeout, | |
7ee91ec1 | 553 | .maxlen = sizeof(unsigned long), |
1da177e4 | 554 | .mode = 0644, |
6d456111 | 555 | .proc_handler = proc_doulongvec_minmax, |
1da177e4 LT |
556 | .extra1 = (unsigned long *) &nlm_timeout_min, |
557 | .extra2 = (unsigned long *) &nlm_timeout_max, | |
558 | }, | |
559 | { | |
1da177e4 LT |
560 | .procname = "nlm_udpport", |
561 | .data = &nlm_udpport, | |
562 | .maxlen = sizeof(int), | |
563 | .mode = 0644, | |
6d456111 | 564 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
565 | .extra1 = (int *) &nlm_port_min, |
566 | .extra2 = (int *) &nlm_port_max, | |
567 | }, | |
568 | { | |
1da177e4 LT |
569 | .procname = "nlm_tcpport", |
570 | .data = &nlm_tcpport, | |
571 | .maxlen = sizeof(int), | |
572 | .mode = 0644, | |
6d456111 | 573 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
574 | .extra1 = (int *) &nlm_port_min, |
575 | .extra2 = (int *) &nlm_port_max, | |
576 | }, | |
abd1f500 | 577 | { |
abd1f500 OK |
578 | .procname = "nsm_use_hostnames", |
579 | .data = &nsm_use_hostnames, | |
580 | .maxlen = sizeof(int), | |
581 | .mode = 0644, | |
6d456111 | 582 | .proc_handler = proc_dointvec, |
abd1f500 | 583 | }, |
460f5cac | 584 | { |
460f5cac OK |
585 | .procname = "nsm_local_state", |
586 | .data = &nsm_local_state, | |
587 | .maxlen = sizeof(int), | |
588 | .mode = 0644, | |
6d456111 | 589 | .proc_handler = proc_dointvec, |
460f5cac | 590 | }, |
ab09203e | 591 | { } |
1da177e4 LT |
592 | }; |
593 | ||
7ac9fe57 | 594 | static struct ctl_table nlm_sysctl_dir[] = { |
1da177e4 | 595 | { |
1da177e4 LT |
596 | .procname = "nfs", |
597 | .mode = 0555, | |
598 | .child = nlm_sysctls, | |
599 | }, | |
ab09203e | 600 | { } |
1da177e4 LT |
601 | }; |
602 | ||
7ac9fe57 | 603 | static struct ctl_table nlm_sysctl_root[] = { |
1da177e4 | 604 | { |
1da177e4 LT |
605 | .procname = "fs", |
606 | .mode = 0555, | |
607 | .child = nlm_sysctl_dir, | |
608 | }, | |
ab09203e | 609 | { } |
1da177e4 LT |
610 | }; |
611 | ||
90d5b180 CL |
612 | #endif /* CONFIG_SYSCTL */ |
613 | ||
1da177e4 | 614 | /* |
405ae7d3 | 615 | * Module (and sysfs) parameters. |
1da177e4 LT |
616 | */ |
617 | ||
618 | #define param_set_min_max(name, type, which_strtol, min, max) \ | |
e4dca7b7 | 619 | static int param_set_##name(const char *val, const struct kernel_param *kp) \ |
1da177e4 LT |
620 | { \ |
621 | char *endp; \ | |
622 | __typeof__(type) num = which_strtol(val, &endp, 0); \ | |
623 | if (endp == val || *endp || num < (min) || num > (max)) \ | |
624 | return -EINVAL; \ | |
de5b8e8e | 625 | *((type *) kp->arg) = num; \ |
1da177e4 LT |
626 | return 0; \ |
627 | } | |
628 | ||
629 | static inline int is_callback(u32 proc) | |
630 | { | |
631 | return proc == NLMPROC_GRANTED | |
632 | || proc == NLMPROC_GRANTED_MSG | |
633 | || proc == NLMPROC_TEST_RES | |
634 | || proc == NLMPROC_LOCK_RES | |
635 | || proc == NLMPROC_CANCEL_RES | |
636 | || proc == NLMPROC_UNLOCK_RES | |
637 | || proc == NLMPROC_NSM_NOTIFY; | |
638 | } | |
639 | ||
640 | ||
641 | static int lockd_authenticate(struct svc_rqst *rqstp) | |
642 | { | |
643 | rqstp->rq_client = NULL; | |
644 | switch (rqstp->rq_authop->flavour) { | |
645 | case RPC_AUTH_NULL: | |
646 | case RPC_AUTH_UNIX: | |
647 | if (rqstp->rq_proc == 0) | |
648 | return SVC_OK; | |
649 | if (is_callback(rqstp->rq_proc)) { | |
650 | /* Leave it to individual procedures to | |
651 | * call nlmsvc_lookup_host(rqstp) | |
652 | */ | |
653 | return SVC_OK; | |
654 | } | |
655 | return svc_set_client(rqstp); | |
656 | } | |
657 | return SVC_DENIED; | |
658 | } | |
659 | ||
660 | ||
661 | param_set_min_max(port, int, simple_strtol, 0, 65535) | |
662 | param_set_min_max(grace_period, unsigned long, simple_strtoul, | |
663 | nlm_grace_period_min, nlm_grace_period_max) | |
664 | param_set_min_max(timeout, unsigned long, simple_strtoul, | |
665 | nlm_timeout_min, nlm_timeout_max) | |
666 | ||
667 | MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); | |
668 | MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION "."); | |
669 | MODULE_LICENSE("GPL"); | |
670 | ||
671 | module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong, | |
672 | &nlm_grace_period, 0644); | |
673 | module_param_call(nlm_timeout, param_set_timeout, param_get_ulong, | |
674 | &nlm_timeout, 0644); | |
675 | module_param_call(nlm_udpport, param_set_port, param_get_int, | |
676 | &nlm_udpport, 0644); | |
677 | module_param_call(nlm_tcpport, param_set_port, param_get_int, | |
678 | &nlm_tcpport, 0644); | |
abd1f500 | 679 | module_param(nsm_use_hostnames, bool, 0644); |
c72a476b | 680 | module_param(nlm_max_connections, uint, 0644); |
1da177e4 | 681 | |
a9c5d73a SK |
682 | static int lockd_init_net(struct net *net) |
683 | { | |
66547b02 SK |
684 | struct lockd_net *ln = net_generic(net, lockd_net_id); |
685 | ||
686 | INIT_DELAYED_WORK(&ln->grace_period_end, grace_ender); | |
f7790029 | 687 | INIT_LIST_HEAD(&ln->lockd_manager.list); |
c87fb4a3 | 688 | ln->lockd_manager.block_opens = false; |
0ad95472 | 689 | INIT_LIST_HEAD(&ln->nsm_handles); |
a9c5d73a SK |
690 | return 0; |
691 | } | |
692 | ||
693 | static void lockd_exit_net(struct net *net) | |
694 | { | |
a3152f14 VA |
695 | struct lockd_net *ln = net_generic(net, lockd_net_id); |
696 | ||
697 | WARN_ONCE(!list_empty(&ln->lockd_manager.list), | |
698 | "net %x %s: lockd_manager.list is not empty\n", | |
699 | net->ns.inum, __func__); | |
700 | WARN_ONCE(!list_empty(&ln->nsm_handles), | |
701 | "net %x %s: nsm_handles list is not empty\n", | |
702 | net->ns.inum, __func__); | |
703 | WARN_ONCE(delayed_work_pending(&ln->grace_period_end), | |
704 | "net %x %s: grace_period_end was not cancelled\n", | |
705 | net->ns.inum, __func__); | |
a9c5d73a SK |
706 | } |
707 | ||
708 | static struct pernet_operations lockd_net_ops = { | |
709 | .init = lockd_init_net, | |
710 | .exit = lockd_exit_net, | |
711 | .id = &lockd_net_id, | |
712 | .size = sizeof(struct lockd_net), | |
713 | }; | |
714 | ||
715 | ||
1da177e4 LT |
716 | /* |
717 | * Initialising and terminating the module. | |
718 | */ | |
719 | ||
720 | static int __init init_nlm(void) | |
721 | { | |
a9c5d73a SK |
722 | int err; |
723 | ||
90d5b180 | 724 | #ifdef CONFIG_SYSCTL |
a9c5d73a | 725 | err = -ENOMEM; |
0b4d4147 | 726 | nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root); |
a9c5d73a SK |
727 | if (nlm_sysctl_table == NULL) |
728 | goto err_sysctl; | |
729 | #endif | |
730 | err = register_pernet_subsys(&lockd_net_ops); | |
731 | if (err) | |
732 | goto err_pernet; | |
d68e3c4a JL |
733 | |
734 | err = lockd_create_procfs(); | |
735 | if (err) | |
736 | goto err_procfs; | |
737 | ||
90d5b180 | 738 | return 0; |
a9c5d73a | 739 | |
d68e3c4a JL |
740 | err_procfs: |
741 | unregister_pernet_subsys(&lockd_net_ops); | |
a9c5d73a SK |
742 | err_pernet: |
743 | #ifdef CONFIG_SYSCTL | |
744 | unregister_sysctl_table(nlm_sysctl_table); | |
a9c5d73a | 745 | err_sysctl: |
12dd7ecf | 746 | #endif |
a9c5d73a | 747 | return err; |
1da177e4 LT |
748 | } |
749 | ||
750 | static void __exit exit_nlm(void) | |
751 | { | |
752 | /* FIXME: delete all NLM clients */ | |
753 | nlm_shutdown_hosts(); | |
d68e3c4a | 754 | lockd_remove_procfs(); |
a9c5d73a | 755 | unregister_pernet_subsys(&lockd_net_ops); |
90d5b180 | 756 | #ifdef CONFIG_SYSCTL |
1da177e4 | 757 | unregister_sysctl_table(nlm_sysctl_table); |
90d5b180 | 758 | #endif |
1da177e4 LT |
759 | } |
760 | ||
761 | module_init(init_nlm); | |
762 | module_exit(exit_nlm); | |
763 | ||
764 | /* | |
765 | * Define NLM program and procedures | |
766 | */ | |
7fd38af9 | 767 | static unsigned int nlmsvc_version1_count[17]; |
e9679189 CH |
768 | static const struct svc_version nlmsvc_version1 = { |
769 | .vs_vers = 1, | |
770 | .vs_nproc = 17, | |
771 | .vs_proc = nlmsvc_procedures, | |
772 | .vs_count = nlmsvc_version1_count, | |
773 | .vs_xdrsize = NLMSVC_XDRSIZE, | |
1da177e4 | 774 | }; |
7fd38af9 | 775 | static unsigned int nlmsvc_version3_count[24]; |
e9679189 CH |
776 | static const struct svc_version nlmsvc_version3 = { |
777 | .vs_vers = 3, | |
778 | .vs_nproc = 24, | |
779 | .vs_proc = nlmsvc_procedures, | |
780 | .vs_count = nlmsvc_version3_count, | |
781 | .vs_xdrsize = NLMSVC_XDRSIZE, | |
1da177e4 LT |
782 | }; |
783 | #ifdef CONFIG_LOCKD_V4 | |
7fd38af9 | 784 | static unsigned int nlmsvc_version4_count[24]; |
e9679189 CH |
785 | static const struct svc_version nlmsvc_version4 = { |
786 | .vs_vers = 4, | |
787 | .vs_nproc = 24, | |
788 | .vs_proc = nlmsvc_procedures4, | |
789 | .vs_count = nlmsvc_version4_count, | |
790 | .vs_xdrsize = NLMSVC_XDRSIZE, | |
1da177e4 LT |
791 | }; |
792 | #endif | |
e9679189 | 793 | static const struct svc_version *nlmsvc_version[] = { |
1da177e4 LT |
794 | [1] = &nlmsvc_version1, |
795 | [3] = &nlmsvc_version3, | |
796 | #ifdef CONFIG_LOCKD_V4 | |
797 | [4] = &nlmsvc_version4, | |
798 | #endif | |
799 | }; | |
800 | ||
801 | static struct svc_stat nlmsvc_stats; | |
802 | ||
e8c96f8c | 803 | #define NLM_NRVERS ARRAY_SIZE(nlmsvc_version) |
1da177e4 LT |
804 | static struct svc_program nlmsvc_program = { |
805 | .pg_prog = NLM_PROGRAM, /* program number */ | |
806 | .pg_nvers = NLM_NRVERS, /* number of entries in nlmsvc_version */ | |
807 | .pg_vers = nlmsvc_version, /* version table */ | |
808 | .pg_name = "lockd", /* service name */ | |
809 | .pg_class = "nfsd", /* share authentication with nfsd */ | |
810 | .pg_stats = &nlmsvc_stats, /* stats table */ | |
8e5b6773 TM |
811 | .pg_authenticate = &lockd_authenticate, /* export authentication */ |
812 | .pg_init_request = svc_generic_init_request, | |
642ee6b2 | 813 | .pg_rpcbind_set = svc_generic_rpcbind_set, |
1da177e4 | 814 | }; |