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Commit | Line | Data |
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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 RL |
101 | #if defined(CONFIG_NFS_V4_1) |
102 | /* | |
103 | * The callback service for NFSv4.1 callbacks | |
104 | */ | |
105 | static int | |
106 | nfs41_callback_svc(void *vrqstp) | |
107 | { | |
108 | struct svc_rqst *rqstp = vrqstp; | |
109 | struct svc_serv *serv = rqstp->rq_server; | |
110 | struct rpc_rqst *req; | |
111 | int error; | |
112 | DEFINE_WAIT(wq); | |
113 | ||
114 | set_freezable(); | |
115 | ||
a43cde94 | 116 | while (!kthread_should_stop()) { |
25d280aa JL |
117 | if (try_to_freeze()) |
118 | continue; | |
119 | ||
5d05e54a | 120 | prepare_to_wait(&serv->sv_cb_waitq, &wq, TASK_INTERRUPTIBLE); |
a43cde94 RL |
121 | spin_lock_bh(&serv->sv_cb_lock); |
122 | if (!list_empty(&serv->sv_cb_list)) { | |
123 | req = list_first_entry(&serv->sv_cb_list, | |
124 | struct rpc_rqst, rq_bc_list); | |
125 | list_del(&req->rq_bc_list); | |
126 | spin_unlock_bh(&serv->sv_cb_lock); | |
6ffa30d3 | 127 | finish_wait(&serv->sv_cb_waitq, &wq); |
a43cde94 RL |
128 | dprintk("Invoking bc_svc_process()\n"); |
129 | error = bc_svc_process(serv, req, rqstp); | |
130 | dprintk("bc_svc_process() returned w/ error code= %d\n", | |
131 | error); | |
132 | } else { | |
133 | spin_unlock_bh(&serv->sv_cb_lock); | |
5d05e54a | 134 | schedule(); |
6ffa30d3 | 135 | finish_wait(&serv->sv_cb_waitq, &wq); |
a43cde94 | 136 | } |
5d05e54a | 137 | flush_signals(current); |
a43cde94 | 138 | } |
a43cde94 RL |
139 | return 0; |
140 | } | |
141 | ||
142 | /* | |
143 | * Bring up the NFSv4.1 callback service | |
144 | */ | |
17280175 | 145 | static struct svc_rqst * |
691c457a | 146 | nfs41_callback_up(struct svc_serv *serv) |
a43cde94 | 147 | { |
01c9a0bc | 148 | struct svc_rqst *rqstp; |
8f975242 | 149 | |
a43cde94 RL |
150 | INIT_LIST_HEAD(&serv->sv_cb_list); |
151 | spin_lock_init(&serv->sv_cb_lock); | |
152 | init_waitqueue_head(&serv->sv_cb_waitq); | |
11fd165c | 153 | rqstp = svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE); |
54bcfa66 | 154 | dprintk("--> %s return %d\n", __func__, PTR_ERR_OR_ZERO(rqstp)); |
8f975242 | 155 | return rqstp; |
a43cde94 RL |
156 | } |
157 | ||
758201e2 | 158 | static void nfs_minorversion_callback_svc_setup(struct svc_serv *serv, |
a43cde94 RL |
159 | struct svc_rqst **rqstpp, int (**callback_svc)(void *vrqstp)) |
160 | { | |
758201e2 TM |
161 | *rqstpp = nfs41_callback_up(serv); |
162 | *callback_svc = nfs41_callback_svc; | |
a43cde94 RL |
163 | } |
164 | ||
165 | static inline void nfs_callback_bc_serv(u32 minorversion, struct rpc_xprt *xprt, | |
691c457a | 166 | struct svc_serv *serv) |
a43cde94 RL |
167 | { |
168 | if (minorversion) | |
691c457a SK |
169 | /* |
170 | * Save the svc_serv in the transport so that it can | |
171 | * be referenced when the session backchannel is initialized | |
172 | */ | |
173 | xprt->bc_serv = serv; | |
a43cde94 RL |
174 | } |
175 | #else | |
758201e2 | 176 | static void nfs_minorversion_callback_svc_setup(struct svc_serv *serv, |
a43cde94 RL |
177 | struct svc_rqst **rqstpp, int (**callback_svc)(void *vrqstp)) |
178 | { | |
758201e2 TM |
179 | *rqstpp = ERR_PTR(-ENOTSUPP); |
180 | *callback_svc = ERR_PTR(-ENOTSUPP); | |
a43cde94 RL |
181 | } |
182 | ||
183 | static inline void nfs_callback_bc_serv(u32 minorversion, struct rpc_xprt *xprt, | |
691c457a | 184 | struct svc_serv *serv) |
a43cde94 RL |
185 | { |
186 | } | |
187 | #endif /* CONFIG_NFS_V4_1 */ | |
188 | ||
8e246144 SK |
189 | static int nfs_callback_start_svc(int minorversion, struct rpc_xprt *xprt, |
190 | struct svc_serv *serv) | |
191 | { | |
192 | struct svc_rqst *rqstp; | |
193 | int (*callback_svc)(void *vrqstp); | |
194 | struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion]; | |
8e246144 | 195 | int ret; |
8e246144 SK |
196 | |
197 | nfs_callback_bc_serv(minorversion, xprt, serv); | |
198 | ||
23c20ecd SK |
199 | if (cb_info->task) |
200 | return 0; | |
201 | ||
758201e2 TM |
202 | switch (minorversion) { |
203 | case 0: | |
8e246144 SK |
204 | /* v4.0 callback setup */ |
205 | rqstp = nfs4_callback_up(serv); | |
206 | callback_svc = nfs4_callback_svc; | |
758201e2 TM |
207 | break; |
208 | default: | |
209 | nfs_minorversion_callback_svc_setup(serv, | |
210 | &rqstp, &callback_svc); | |
8e246144 SK |
211 | } |
212 | ||
213 | if (IS_ERR(rqstp)) | |
214 | return PTR_ERR(rqstp); | |
215 | ||
216 | svc_sock_update_bufs(serv); | |
217 | ||
8e246144 SK |
218 | cb_info->serv = serv; |
219 | cb_info->rqst = rqstp; | |
66f09ca7 | 220 | cb_info->task = kthread_create(callback_svc, cb_info->rqst, |
f170168b | 221 | "nfsv4.%u-svc", minorversion); |
8e246144 SK |
222 | if (IS_ERR(cb_info->task)) { |
223 | ret = PTR_ERR(cb_info->task); | |
224 | svc_exit_thread(cb_info->rqst); | |
225 | cb_info->rqst = NULL; | |
226 | cb_info->task = NULL; | |
e9b7e917 | 227 | return ret; |
8e246144 | 228 | } |
88799977 | 229 | rqstp->rq_task = cb_info->task; |
66f09ca7 | 230 | wake_up_process(cb_info->task); |
8e246144 SK |
231 | dprintk("nfs_callback_up: service started\n"); |
232 | return 0; | |
233 | } | |
234 | ||
b3d19c51 SK |
235 | static void nfs_callback_down_net(u32 minorversion, struct svc_serv *serv, struct net *net) |
236 | { | |
237 | struct nfs_net *nn = net_generic(net, nfs_net_id); | |
238 | ||
239 | if (--nn->cb_users[minorversion]) | |
240 | return; | |
241 | ||
242 | dprintk("NFS: destroy per-net callback data; net=%p\n", net); | |
243 | svc_shutdown_net(serv, net); | |
244 | } | |
245 | ||
76566773 CL |
246 | static int nfs_callback_up_net(int minorversion, struct svc_serv *serv, |
247 | struct net *net, struct rpc_xprt *xprt) | |
c946556b | 248 | { |
b3d19c51 | 249 | struct nfs_net *nn = net_generic(net, nfs_net_id); |
c946556b SK |
250 | int ret; |
251 | ||
b3d19c51 SK |
252 | if (nn->cb_users[minorversion]++) |
253 | return 0; | |
254 | ||
c946556b SK |
255 | dprintk("NFS: create per-net callback data; net=%p\n", net); |
256 | ||
257 | ret = svc_bind(serv, net); | |
258 | if (ret < 0) { | |
259 | printk(KERN_WARNING "NFS: bind callback service failed\n"); | |
260 | goto err_bind; | |
261 | } | |
262 | ||
76566773 CL |
263 | ret = -EPROTONOSUPPORT; |
264 | if (minorversion == 0) | |
265 | ret = nfs4_callback_up_net(serv, net); | |
266 | else if (xprt->ops->bc_up) | |
267 | ret = xprt->ops->bc_up(serv, net); | |
c946556b SK |
268 | |
269 | if (ret < 0) { | |
270 | printk(KERN_ERR "NFS: callback service start failed\n"); | |
271 | goto err_socks; | |
272 | } | |
273 | return 0; | |
274 | ||
275 | err_socks: | |
276 | svc_rpcb_cleanup(serv, net); | |
277 | err_bind: | |
98b0f80c | 278 | nn->cb_users[minorversion]--; |
23c20ecd SK |
279 | dprintk("NFS: Couldn't create callback socket: err = %d; " |
280 | "net = %p\n", ret, net); | |
c946556b SK |
281 | return ret; |
282 | } | |
283 | ||
ea126e74 | 284 | static struct svc_serv_ops nfs_cb_sv_ops = { |
b9e13cdf | 285 | .svo_enqueue_xprt = svc_xprt_do_enqueue, |
ea126e74 JL |
286 | }; |
287 | ||
dd018428 SK |
288 | static struct svc_serv *nfs_callback_create_svc(int minorversion) |
289 | { | |
290 | struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion]; | |
291 | struct svc_serv *serv; | |
292 | ||
293 | /* | |
294 | * Check whether we're already up and running. | |
295 | */ | |
296 | if (cb_info->task) { | |
297 | /* | |
298 | * Note: increase service usage, because later in case of error | |
299 | * svc_destroy() will be called. | |
300 | */ | |
301 | svc_get(cb_info->serv); | |
302 | return cb_info->serv; | |
303 | } | |
304 | ||
305 | /* | |
306 | * Sanity check: if there's no task, | |
307 | * we should be the first user ... | |
308 | */ | |
309 | if (cb_info->users) | |
310 | printk(KERN_WARNING "nfs_callback_create_svc: no kthread, %d users??\n", | |
311 | cb_info->users); | |
312 | ||
ea126e74 | 313 | serv = svc_create(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE, &nfs_cb_sv_ops); |
dd018428 SK |
314 | if (!serv) { |
315 | printk(KERN_ERR "nfs_callback_create_svc: create service failed\n"); | |
316 | return ERR_PTR(-ENOMEM); | |
317 | } | |
318 | /* As there is only one thread we need to over-ride the | |
319 | * default maximum of 80 connections | |
320 | */ | |
321 | serv->sv_maxconn = 1024; | |
322 | dprintk("nfs_callback_create_svc: service created\n"); | |
323 | return serv; | |
324 | } | |
325 | ||
71468513 BH |
326 | /* |
327 | * Bring up the callback thread if it is not already up. | |
328 | */ | |
329 | int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt) | |
330 | { | |
dd018428 | 331 | struct svc_serv *serv; |
e82dc22d | 332 | struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion]; |
23c20ecd | 333 | int ret; |
c946556b | 334 | struct net *net = xprt->xprt_net; |
71468513 BH |
335 | |
336 | mutex_lock(&nfs_callback_mutex); | |
dd018428 SK |
337 | |
338 | serv = nfs_callback_create_svc(minorversion); | |
339 | if (IS_ERR(serv)) { | |
340 | ret = PTR_ERR(serv); | |
341 | goto err_create; | |
342 | } | |
343 | ||
76566773 | 344 | ret = nfs_callback_up_net(minorversion, serv, net, xprt); |
c946556b SK |
345 | if (ret < 0) |
346 | goto err_net; | |
9793f7c8 | 347 | |
8e246144 SK |
348 | ret = nfs_callback_start_svc(minorversion, xprt, serv); |
349 | if (ret < 0) | |
350 | goto err_start; | |
a277e33c | 351 | |
23c20ecd | 352 | cb_info->users++; |
8e60029f JL |
353 | /* |
354 | * svc_create creates the svc_serv with sv_nrthreads == 1, and then | |
a277e33c | 355 | * svc_prepare_thread increments that. So we need to call svc_destroy |
8e60029f JL |
356 | * on both success and failure so that the refcount is 1 when the |
357 | * thread exits. | |
358 | */ | |
23c20ecd | 359 | err_net: |
dd018428 SK |
360 | svc_destroy(serv); |
361 | err_create: | |
353ab6e9 | 362 | mutex_unlock(&nfs_callback_mutex); |
1da177e4 | 363 | return ret; |
8e246144 SK |
364 | |
365 | err_start: | |
b3d19c51 | 366 | nfs_callback_down_net(minorversion, serv, net); |
23c20ecd SK |
367 | dprintk("NFS: Couldn't create server thread; err = %d\n", ret); |
368 | goto err_net; | |
1da177e4 LT |
369 | } |
370 | ||
371 | /* | |
5afc597c | 372 | * Kill the callback thread if it's no longer being used. |
1da177e4 | 373 | */ |
c8ceb412 | 374 | void nfs_callback_down(int minorversion, struct net *net) |
1da177e4 | 375 | { |
e82dc22d AA |
376 | struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion]; |
377 | ||
353ab6e9 | 378 | mutex_lock(&nfs_callback_mutex); |
b3d19c51 | 379 | nfs_callback_down_net(minorversion, cb_info->serv, net); |
e82dc22d AA |
380 | cb_info->users--; |
381 | if (cb_info->users == 0 && cb_info->task != NULL) { | |
382 | kthread_stop(cb_info->task); | |
1dc42e04 | 383 | dprintk("nfs_callback_down: service stopped\n"); |
e82dc22d | 384 | svc_exit_thread(cb_info->rqst); |
1dc42e04 | 385 | dprintk("nfs_callback_down: service destroyed\n"); |
e82dc22d AA |
386 | cb_info->serv = NULL; |
387 | cb_info->rqst = NULL; | |
388 | cb_info->task = NULL; | |
5afc597c | 389 | } |
353ab6e9 | 390 | mutex_unlock(&nfs_callback_mutex); |
1da177e4 LT |
391 | } |
392 | ||
778be232 AA |
393 | /* Boolean check of RPC_AUTH_GSS principal */ |
394 | int | |
395 | check_gss_callback_principal(struct nfs_client *clp, struct svc_rqst *rqstp) | |
945b34a7 | 396 | { |
03a4e1f6 | 397 | char *p = rqstp->rq_cred.cr_principal; |
945b34a7 | 398 | |
778be232 AA |
399 | if (rqstp->rq_authop->flavour != RPC_AUTH_GSS) |
400 | return 1; | |
401 | ||
ece0de63 AA |
402 | /* No RPC_AUTH_GSS on NFSv4.1 back channel yet */ |
403 | if (clp->cl_minorversion != 0) | |
778be232 | 404 | return 0; |
945b34a7 OK |
405 | /* |
406 | * It might just be a normal user principal, in which case | |
407 | * userspace won't bother to tell us the name at all. | |
408 | */ | |
409 | if (p == NULL) | |
778be232 | 410 | return 0; |
945b34a7 | 411 | |
f11b2a1c JL |
412 | /* |
413 | * Did we get the acceptor from userland during the SETCLIENID | |
414 | * negotiation? | |
415 | */ | |
416 | if (clp->cl_acceptor) | |
417 | return !strcmp(p, clp->cl_acceptor); | |
418 | ||
419 | /* | |
420 | * Otherwise try to verify it using the cl_hostname. Note that this | |
421 | * doesn't work if a non-canonical hostname was used in the devname. | |
422 | */ | |
423 | ||
945b34a7 OK |
424 | /* Expect a GSS_C_NT_HOSTBASED_NAME like "nfs@serverhostname" */ |
425 | ||
426 | if (memcmp(p, "nfs@", 4) != 0) | |
778be232 | 427 | return 0; |
945b34a7 | 428 | p += 4; |
4e0038b6 | 429 | if (strcmp(p, clp->cl_hostname) != 0) |
778be232 AA |
430 | return 0; |
431 | return 1; | |
945b34a7 OK |
432 | } |
433 | ||
778be232 AA |
434 | /* |
435 | * pg_authenticate method for nfsv4 callback threads. | |
436 | * | |
437 | * The authflavor has been negotiated, so an incorrect flavor is a server | |
6f02dc88 | 438 | * bug. Deny packets with incorrect authflavor. |
778be232 AA |
439 | * |
440 | * All other checking done after NFS decoding where the nfs_client can be | |
441 | * found in nfs4_callback_compound | |
442 | */ | |
1da177e4 LT |
443 | static int nfs_callback_authenticate(struct svc_rqst *rqstp) |
444 | { | |
1da177e4 | 445 | switch (rqstp->rq_authop->flavour) { |
778be232 AA |
446 | case RPC_AUTH_NULL: |
447 | if (rqstp->rq_proc != CB_NULL) | |
6f02dc88 | 448 | return SVC_DENIED; |
778be232 AA |
449 | break; |
450 | case RPC_AUTH_GSS: | |
451 | /* No RPC_AUTH_GSS support yet in NFSv4.1 */ | |
452 | if (svc_is_backchannel(rqstp)) | |
6f02dc88 | 453 | return SVC_DENIED; |
1da177e4 | 454 | } |
778be232 | 455 | return SVC_OK; |
1da177e4 LT |
456 | } |
457 | ||
458 | /* | |
459 | * Define NFS4 callback program | |
460 | */ | |
1da177e4 LT |
461 | static struct svc_version *nfs4_callback_version[] = { |
462 | [1] = &nfs4_callback_version1, | |
07bccc2d | 463 | [4] = &nfs4_callback_version4, |
1da177e4 LT |
464 | }; |
465 | ||
466 | static struct svc_stat nfs4_callback_stats; | |
467 | ||
468 | static struct svc_program nfs4_callback_program = { | |
469 | .pg_prog = NFS4_CALLBACK, /* RPC service number */ | |
470 | .pg_nvers = ARRAY_SIZE(nfs4_callback_version), /* Number of entries */ | |
471 | .pg_vers = nfs4_callback_version, /* version table */ | |
472 | .pg_name = "NFSv4 callback", /* service name */ | |
473 | .pg_class = "nfs", /* authentication class */ | |
474 | .pg_stats = &nfs4_callback_stats, | |
475 | .pg_authenticate = nfs_callback_authenticate, | |
476 | }; |