Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/nfs/callback.c | |
3 | * | |
4 | * Copyright (C) 2004 Trond Myklebust | |
5 | * | |
6 | * NFSv4 callback handling | |
7 | */ | |
8 | ||
1da177e4 LT |
9 | #include <linux/completion.h> |
10 | #include <linux/ip.h> | |
11 | #include <linux/module.h> | |
1da177e4 LT |
12 | #include <linux/sunrpc/svc.h> |
13 | #include <linux/sunrpc/svcsock.h> | |
14 | #include <linux/nfs_fs.h> | |
758201e2 | 15 | #include <linux/errno.h> |
353ab6e9 | 16 | #include <linux/mutex.h> |
83144186 | 17 | #include <linux/freezer.h> |
a277e33c | 18 | #include <linux/kthread.h> |
945b34a7 | 19 | #include <linux/sunrpc/svcauth_gss.h> |
a43cde94 | 20 | #include <linux/sunrpc/bc_xprt.h> |
14c85021 ACM |
21 | |
22 | #include <net/inet_sock.h> | |
23 | ||
4ce79717 | 24 | #include "nfs4_fs.h" |
1da177e4 | 25 | #include "callback.h" |
24c8dbbb | 26 | #include "internal.h" |
bbe0a3aa | 27 | #include "netns.h" |
1da177e4 LT |
28 | |
29 | #define NFSDBG_FACILITY NFSDBG_CALLBACK | |
30 | ||
31 | struct nfs_callback_data { | |
32 | unsigned int users; | |
a43cde94 | 33 | struct svc_serv *serv; |
5afc597c | 34 | struct svc_rqst *rqst; |
a277e33c | 35 | struct task_struct *task; |
1da177e4 LT |
36 | }; |
37 | ||
e82dc22d | 38 | static struct nfs_callback_data nfs_callback_info[NFS4_MAX_MINOR_VERSION + 1]; |
353ab6e9 | 39 | static DEFINE_MUTEX(nfs_callback_mutex); |
1da177e4 LT |
40 | static struct svc_program nfs4_callback_program; |
41 | ||
c946556b SK |
42 | static int nfs4_callback_up_net(struct svc_serv *serv, struct net *net) |
43 | { | |
44 | int ret; | |
bbe0a3aa | 45 | struct nfs_net *nn = net_generic(net, nfs_net_id); |
c946556b SK |
46 | |
47 | ret = svc_create_xprt(serv, "tcp", net, PF_INET, | |
48 | nfs_callback_set_tcpport, SVC_SOCK_ANONYMOUS); | |
49 | if (ret <= 0) | |
50 | goto out_err; | |
bbe0a3aa | 51 | nn->nfs_callback_tcpport = ret; |
c946556b | 52 | dprintk("NFS: Callback listener port = %u (af %u, net %p)\n", |
bbe0a3aa | 53 | nn->nfs_callback_tcpport, PF_INET, net); |
c946556b SK |
54 | |
55 | ret = svc_create_xprt(serv, "tcp", net, PF_INET6, | |
56 | nfs_callback_set_tcpport, SVC_SOCK_ANONYMOUS); | |
57 | if (ret > 0) { | |
29dcc16a | 58 | nn->nfs_callback_tcpport6 = ret; |
c946556b | 59 | dprintk("NFS: Callback listener port = %u (af %u, net %p)\n", |
29dcc16a | 60 | nn->nfs_callback_tcpport6, PF_INET6, net); |
c946556b SK |
61 | } else if (ret != -EAFNOSUPPORT) |
62 | goto out_err; | |
63 | return 0; | |
64 | ||
65 | out_err: | |
66 | return (ret) ? ret : -ENOMEM; | |
67 | } | |
68 | ||
1da177e4 | 69 | /* |
e82dc22d | 70 | * This is the NFSv4 callback kernel thread. |
1da177e4 | 71 | */ |
a277e33c | 72 | static int |
71468513 | 73 | nfs4_callback_svc(void *vrqstp) |
1da177e4 | 74 | { |
5b444cc9 | 75 | int err; |
a277e33c | 76 | struct svc_rqst *rqstp = vrqstp; |
1da177e4 | 77 | |
83144186 | 78 | set_freezable(); |
1da177e4 | 79 | |
a277e33c | 80 | while (!kthread_should_stop()) { |
1da177e4 LT |
81 | /* |
82 | * Listen for a request on the socket | |
83 | */ | |
6fb2b47f | 84 | err = svc_recv(rqstp, MAX_SCHEDULE_TIMEOUT); |
5b444cc9 | 85 | if (err == -EAGAIN || err == -EINTR) |
1da177e4 | 86 | continue; |
6fb2b47f | 87 | svc_process(rqstp); |
1da177e4 | 88 | } |
a277e33c | 89 | return 0; |
1da177e4 LT |
90 | } |
91 | ||
92 | /* | |
71468513 | 93 | * Prepare to bring up the NFSv4 callback service |
1da177e4 | 94 | */ |
17280175 | 95 | static struct svc_rqst * |
691c457a | 96 | nfs4_callback_up(struct svc_serv *serv) |
1da177e4 | 97 | { |
11fd165c | 98 | return svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE); |
71468513 BH |
99 | } |
100 | ||
a43cde94 | 101 | #if defined(CONFIG_NFS_V4_1) |
c946556b SK |
102 | static int nfs41_callback_up_net(struct svc_serv *serv, struct net *net) |
103 | { | |
104 | /* | |
105 | * Create an svc_sock for the back channel service that shares the | |
106 | * fore channel connection. | |
107 | * Returns the input port (0) and sets the svc_serv bc_xprt on success | |
108 | */ | |
109 | return svc_create_xprt(serv, "tcp-bc", net, PF_INET, 0, | |
110 | SVC_SOCK_ANONYMOUS); | |
111 | } | |
112 | ||
a43cde94 RL |
113 | /* |
114 | * The callback service for NFSv4.1 callbacks | |
115 | */ | |
116 | static int | |
117 | nfs41_callback_svc(void *vrqstp) | |
118 | { | |
119 | struct svc_rqst *rqstp = vrqstp; | |
120 | struct svc_serv *serv = rqstp->rq_server; | |
121 | struct rpc_rqst *req; | |
122 | int error; | |
123 | DEFINE_WAIT(wq); | |
124 | ||
125 | set_freezable(); | |
126 | ||
a43cde94 RL |
127 | while (!kthread_should_stop()) { |
128 | prepare_to_wait(&serv->sv_cb_waitq, &wq, TASK_INTERRUPTIBLE); | |
129 | spin_lock_bh(&serv->sv_cb_lock); | |
130 | if (!list_empty(&serv->sv_cb_list)) { | |
131 | req = list_first_entry(&serv->sv_cb_list, | |
132 | struct rpc_rqst, rq_bc_list); | |
133 | list_del(&req->rq_bc_list); | |
134 | spin_unlock_bh(&serv->sv_cb_lock); | |
135 | dprintk("Invoking bc_svc_process()\n"); | |
136 | error = bc_svc_process(serv, req, rqstp); | |
137 | dprintk("bc_svc_process() returned w/ error code= %d\n", | |
138 | error); | |
139 | } else { | |
140 | spin_unlock_bh(&serv->sv_cb_lock); | |
141 | schedule(); | |
142 | } | |
143 | finish_wait(&serv->sv_cb_waitq, &wq); | |
144 | } | |
a43cde94 RL |
145 | return 0; |
146 | } | |
147 | ||
148 | /* | |
149 | * Bring up the NFSv4.1 callback service | |
150 | */ | |
17280175 | 151 | static struct svc_rqst * |
691c457a | 152 | nfs41_callback_up(struct svc_serv *serv) |
a43cde94 | 153 | { |
01c9a0bc | 154 | struct svc_rqst *rqstp; |
8f975242 | 155 | |
a43cde94 RL |
156 | INIT_LIST_HEAD(&serv->sv_cb_list); |
157 | spin_lock_init(&serv->sv_cb_lock); | |
158 | init_waitqueue_head(&serv->sv_cb_waitq); | |
11fd165c | 159 | rqstp = svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE); |
01c9a0bc | 160 | if (IS_ERR(rqstp)) { |
4a19de0f AA |
161 | svc_xprt_put(serv->sv_bc_xprt); |
162 | serv->sv_bc_xprt = NULL; | |
01c9a0bc | 163 | } |
01c9a0bc AA |
164 | dprintk("--> %s return %ld\n", __func__, |
165 | IS_ERR(rqstp) ? PTR_ERR(rqstp) : 0); | |
8f975242 | 166 | return rqstp; |
a43cde94 RL |
167 | } |
168 | ||
758201e2 | 169 | static void nfs_minorversion_callback_svc_setup(struct svc_serv *serv, |
a43cde94 RL |
170 | struct svc_rqst **rqstpp, int (**callback_svc)(void *vrqstp)) |
171 | { | |
758201e2 TM |
172 | *rqstpp = nfs41_callback_up(serv); |
173 | *callback_svc = nfs41_callback_svc; | |
a43cde94 RL |
174 | } |
175 | ||
176 | static inline void nfs_callback_bc_serv(u32 minorversion, struct rpc_xprt *xprt, | |
691c457a | 177 | struct svc_serv *serv) |
a43cde94 RL |
178 | { |
179 | if (minorversion) | |
691c457a SK |
180 | /* |
181 | * Save the svc_serv in the transport so that it can | |
182 | * be referenced when the session backchannel is initialized | |
183 | */ | |
184 | xprt->bc_serv = serv; | |
a43cde94 RL |
185 | } |
186 | #else | |
c946556b SK |
187 | static int nfs41_callback_up_net(struct svc_serv *serv, struct net *net) |
188 | { | |
189 | return 0; | |
190 | } | |
191 | ||
758201e2 | 192 | static void nfs_minorversion_callback_svc_setup(struct svc_serv *serv, |
a43cde94 RL |
193 | struct svc_rqst **rqstpp, int (**callback_svc)(void *vrqstp)) |
194 | { | |
758201e2 TM |
195 | *rqstpp = ERR_PTR(-ENOTSUPP); |
196 | *callback_svc = ERR_PTR(-ENOTSUPP); | |
a43cde94 RL |
197 | } |
198 | ||
199 | static inline void nfs_callback_bc_serv(u32 minorversion, struct rpc_xprt *xprt, | |
691c457a | 200 | struct svc_serv *serv) |
a43cde94 RL |
201 | { |
202 | } | |
203 | #endif /* CONFIG_NFS_V4_1 */ | |
204 | ||
8e246144 SK |
205 | static int nfs_callback_start_svc(int minorversion, struct rpc_xprt *xprt, |
206 | struct svc_serv *serv) | |
207 | { | |
208 | struct svc_rqst *rqstp; | |
209 | int (*callback_svc)(void *vrqstp); | |
210 | struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion]; | |
211 | char svc_name[12]; | |
212 | int ret; | |
8e246144 SK |
213 | |
214 | nfs_callback_bc_serv(minorversion, xprt, serv); | |
215 | ||
23c20ecd SK |
216 | if (cb_info->task) |
217 | return 0; | |
218 | ||
758201e2 TM |
219 | switch (minorversion) { |
220 | case 0: | |
8e246144 SK |
221 | /* v4.0 callback setup */ |
222 | rqstp = nfs4_callback_up(serv); | |
223 | callback_svc = nfs4_callback_svc; | |
758201e2 TM |
224 | break; |
225 | default: | |
226 | nfs_minorversion_callback_svc_setup(serv, | |
227 | &rqstp, &callback_svc); | |
8e246144 SK |
228 | } |
229 | ||
230 | if (IS_ERR(rqstp)) | |
231 | return PTR_ERR(rqstp); | |
232 | ||
233 | svc_sock_update_bufs(serv); | |
234 | ||
235 | sprintf(svc_name, "nfsv4.%u-svc", minorversion); | |
236 | cb_info->serv = serv; | |
237 | cb_info->rqst = rqstp; | |
238 | cb_info->task = kthread_run(callback_svc, cb_info->rqst, svc_name); | |
239 | if (IS_ERR(cb_info->task)) { | |
240 | ret = PTR_ERR(cb_info->task); | |
241 | svc_exit_thread(cb_info->rqst); | |
242 | cb_info->rqst = NULL; | |
243 | cb_info->task = NULL; | |
e9b7e917 | 244 | return ret; |
8e246144 SK |
245 | } |
246 | dprintk("nfs_callback_up: service started\n"); | |
247 | return 0; | |
248 | } | |
249 | ||
b3d19c51 SK |
250 | static void nfs_callback_down_net(u32 minorversion, struct svc_serv *serv, struct net *net) |
251 | { | |
252 | struct nfs_net *nn = net_generic(net, nfs_net_id); | |
253 | ||
254 | if (--nn->cb_users[minorversion]) | |
255 | return; | |
256 | ||
257 | dprintk("NFS: destroy per-net callback data; net=%p\n", net); | |
258 | svc_shutdown_net(serv, net); | |
259 | } | |
260 | ||
c946556b SK |
261 | static int nfs_callback_up_net(int minorversion, struct svc_serv *serv, struct net *net) |
262 | { | |
b3d19c51 | 263 | struct nfs_net *nn = net_generic(net, nfs_net_id); |
c946556b SK |
264 | int ret; |
265 | ||
b3d19c51 SK |
266 | if (nn->cb_users[minorversion]++) |
267 | return 0; | |
268 | ||
c946556b SK |
269 | dprintk("NFS: create per-net callback data; net=%p\n", net); |
270 | ||
271 | ret = svc_bind(serv, net); | |
272 | if (ret < 0) { | |
273 | printk(KERN_WARNING "NFS: bind callback service failed\n"); | |
274 | goto err_bind; | |
275 | } | |
276 | ||
277 | switch (minorversion) { | |
278 | case 0: | |
279 | ret = nfs4_callback_up_net(serv, net); | |
280 | break; | |
281 | case 1: | |
282 | ret = nfs41_callback_up_net(serv, net); | |
283 | break; | |
284 | default: | |
285 | printk(KERN_ERR "NFS: unknown callback version: %d\n", | |
286 | minorversion); | |
287 | ret = -EINVAL; | |
288 | break; | |
289 | } | |
290 | ||
291 | if (ret < 0) { | |
292 | printk(KERN_ERR "NFS: callback service start failed\n"); | |
293 | goto err_socks; | |
294 | } | |
295 | return 0; | |
296 | ||
297 | err_socks: | |
298 | svc_rpcb_cleanup(serv, net); | |
299 | err_bind: | |
23c20ecd SK |
300 | dprintk("NFS: Couldn't create callback socket: err = %d; " |
301 | "net = %p\n", ret, net); | |
c946556b SK |
302 | return ret; |
303 | } | |
304 | ||
dd018428 SK |
305 | static struct svc_serv *nfs_callback_create_svc(int minorversion) |
306 | { | |
307 | struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion]; | |
308 | struct svc_serv *serv; | |
309 | ||
310 | /* | |
311 | * Check whether we're already up and running. | |
312 | */ | |
313 | if (cb_info->task) { | |
314 | /* | |
315 | * Note: increase service usage, because later in case of error | |
316 | * svc_destroy() will be called. | |
317 | */ | |
318 | svc_get(cb_info->serv); | |
319 | return cb_info->serv; | |
320 | } | |
321 | ||
322 | /* | |
323 | * Sanity check: if there's no task, | |
324 | * we should be the first user ... | |
325 | */ | |
326 | if (cb_info->users) | |
327 | printk(KERN_WARNING "nfs_callback_create_svc: no kthread, %d users??\n", | |
328 | cb_info->users); | |
329 | ||
330 | serv = svc_create(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE, NULL); | |
331 | if (!serv) { | |
332 | printk(KERN_ERR "nfs_callback_create_svc: create service failed\n"); | |
333 | return ERR_PTR(-ENOMEM); | |
334 | } | |
335 | /* As there is only one thread we need to over-ride the | |
336 | * default maximum of 80 connections | |
337 | */ | |
338 | serv->sv_maxconn = 1024; | |
339 | dprintk("nfs_callback_create_svc: service created\n"); | |
340 | return serv; | |
341 | } | |
342 | ||
71468513 BH |
343 | /* |
344 | * Bring up the callback thread if it is not already up. | |
345 | */ | |
346 | int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt) | |
347 | { | |
dd018428 | 348 | struct svc_serv *serv; |
e82dc22d | 349 | struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion]; |
23c20ecd | 350 | int ret; |
c946556b | 351 | struct net *net = xprt->xprt_net; |
71468513 BH |
352 | |
353 | mutex_lock(&nfs_callback_mutex); | |
dd018428 SK |
354 | |
355 | serv = nfs_callback_create_svc(minorversion); | |
356 | if (IS_ERR(serv)) { | |
357 | ret = PTR_ERR(serv); | |
358 | goto err_create; | |
359 | } | |
360 | ||
c946556b SK |
361 | ret = nfs_callback_up_net(minorversion, serv, net); |
362 | if (ret < 0) | |
363 | goto err_net; | |
9793f7c8 | 364 | |
8e246144 SK |
365 | ret = nfs_callback_start_svc(minorversion, xprt, serv); |
366 | if (ret < 0) | |
367 | goto err_start; | |
a277e33c | 368 | |
23c20ecd | 369 | cb_info->users++; |
8e60029f JL |
370 | /* |
371 | * svc_create creates the svc_serv with sv_nrthreads == 1, and then | |
a277e33c | 372 | * svc_prepare_thread increments that. So we need to call svc_destroy |
8e60029f JL |
373 | * on both success and failure so that the refcount is 1 when the |
374 | * thread exits. | |
375 | */ | |
23c20ecd | 376 | err_net: |
dd018428 SK |
377 | svc_destroy(serv); |
378 | err_create: | |
353ab6e9 | 379 | mutex_unlock(&nfs_callback_mutex); |
1da177e4 | 380 | return ret; |
8e246144 SK |
381 | |
382 | err_start: | |
b3d19c51 | 383 | nfs_callback_down_net(minorversion, serv, net); |
23c20ecd SK |
384 | dprintk("NFS: Couldn't create server thread; err = %d\n", ret); |
385 | goto err_net; | |
1da177e4 LT |
386 | } |
387 | ||
388 | /* | |
5afc597c | 389 | * Kill the callback thread if it's no longer being used. |
1da177e4 | 390 | */ |
c8ceb412 | 391 | void nfs_callback_down(int minorversion, struct net *net) |
1da177e4 | 392 | { |
e82dc22d AA |
393 | struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion]; |
394 | ||
353ab6e9 | 395 | mutex_lock(&nfs_callback_mutex); |
b3d19c51 | 396 | nfs_callback_down_net(minorversion, cb_info->serv, net); |
e82dc22d AA |
397 | cb_info->users--; |
398 | if (cb_info->users == 0 && cb_info->task != NULL) { | |
399 | kthread_stop(cb_info->task); | |
1dc42e04 | 400 | dprintk("nfs_callback_down: service stopped\n"); |
e82dc22d | 401 | svc_exit_thread(cb_info->rqst); |
1dc42e04 | 402 | dprintk("nfs_callback_down: service destroyed\n"); |
e82dc22d AA |
403 | cb_info->serv = NULL; |
404 | cb_info->rqst = NULL; | |
405 | cb_info->task = NULL; | |
5afc597c | 406 | } |
353ab6e9 | 407 | mutex_unlock(&nfs_callback_mutex); |
1da177e4 LT |
408 | } |
409 | ||
778be232 AA |
410 | /* Boolean check of RPC_AUTH_GSS principal */ |
411 | int | |
412 | check_gss_callback_principal(struct nfs_client *clp, struct svc_rqst *rqstp) | |
945b34a7 | 413 | { |
03a4e1f6 | 414 | char *p = rqstp->rq_cred.cr_principal; |
945b34a7 | 415 | |
778be232 AA |
416 | if (rqstp->rq_authop->flavour != RPC_AUTH_GSS) |
417 | return 1; | |
418 | ||
ece0de63 AA |
419 | /* No RPC_AUTH_GSS on NFSv4.1 back channel yet */ |
420 | if (clp->cl_minorversion != 0) | |
778be232 | 421 | return 0; |
945b34a7 OK |
422 | /* |
423 | * It might just be a normal user principal, in which case | |
424 | * userspace won't bother to tell us the name at all. | |
425 | */ | |
426 | if (p == NULL) | |
778be232 | 427 | return 0; |
945b34a7 OK |
428 | |
429 | /* Expect a GSS_C_NT_HOSTBASED_NAME like "nfs@serverhostname" */ | |
430 | ||
431 | if (memcmp(p, "nfs@", 4) != 0) | |
778be232 | 432 | return 0; |
945b34a7 | 433 | p += 4; |
4e0038b6 | 434 | if (strcmp(p, clp->cl_hostname) != 0) |
778be232 AA |
435 | return 0; |
436 | return 1; | |
945b34a7 OK |
437 | } |
438 | ||
778be232 AA |
439 | /* |
440 | * pg_authenticate method for nfsv4 callback threads. | |
441 | * | |
442 | * The authflavor has been negotiated, so an incorrect flavor is a server | |
443 | * bug. Drop packets with incorrect authflavor. | |
444 | * | |
445 | * All other checking done after NFS decoding where the nfs_client can be | |
446 | * found in nfs4_callback_compound | |
447 | */ | |
1da177e4 LT |
448 | static int nfs_callback_authenticate(struct svc_rqst *rqstp) |
449 | { | |
1da177e4 | 450 | switch (rqstp->rq_authop->flavour) { |
778be232 AA |
451 | case RPC_AUTH_NULL: |
452 | if (rqstp->rq_proc != CB_NULL) | |
453 | return SVC_DROP; | |
454 | break; | |
455 | case RPC_AUTH_GSS: | |
456 | /* No RPC_AUTH_GSS support yet in NFSv4.1 */ | |
457 | if (svc_is_backchannel(rqstp)) | |
458 | return SVC_DROP; | |
1da177e4 | 459 | } |
778be232 | 460 | return SVC_OK; |
1da177e4 LT |
461 | } |
462 | ||
463 | /* | |
464 | * Define NFS4 callback program | |
465 | */ | |
1da177e4 LT |
466 | static struct svc_version *nfs4_callback_version[] = { |
467 | [1] = &nfs4_callback_version1, | |
07bccc2d | 468 | [4] = &nfs4_callback_version4, |
1da177e4 LT |
469 | }; |
470 | ||
471 | static struct svc_stat nfs4_callback_stats; | |
472 | ||
473 | static struct svc_program nfs4_callback_program = { | |
474 | .pg_prog = NFS4_CALLBACK, /* RPC service number */ | |
475 | .pg_nvers = ARRAY_SIZE(nfs4_callback_version), /* Number of entries */ | |
476 | .pg_vers = nfs4_callback_version, /* version table */ | |
477 | .pg_name = "NFSv4 callback", /* service name */ | |
478 | .pg_class = "nfs", /* authentication class */ | |
479 | .pg_stats = &nfs4_callback_stats, | |
480 | .pg_authenticate = nfs_callback_authenticate, | |
481 | }; |