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9#include <linux/completion.h>
10#include <linux/ip.h>
11#include <linux/module.h>
12#include <linux/sunrpc/svc.h>
13#include <linux/sunrpc/svcsock.h>
14#include <linux/nfs_fs.h>
15#include <linux/errno.h>
16#include <linux/mutex.h>
17#include <linux/freezer.h>
18#include <linux/kthread.h>
19#include <linux/sunrpc/svcauth_gss.h>
20#include <linux/sunrpc/bc_xprt.h>
21
22#include <net/inet_sock.h>
23
24#include "nfs4_fs.h"
25#include "callback.h"
26#include "internal.h"
27#include "netns.h"
28
29#define NFSDBG_FACILITY NFSDBG_CALLBACK
30
31struct nfs_callback_data {
32 unsigned int users;
33 struct svc_serv *serv;
34 struct svc_rqst *rqst;
35 struct task_struct *task;
36};
37
38static struct nfs_callback_data nfs_callback_info[NFS4_MAX_MINOR_VERSION + 1];
39static DEFINE_MUTEX(nfs_callback_mutex);
40static struct svc_program nfs4_callback_program;
41
42static int nfs4_callback_up_net(struct svc_serv *serv, struct net *net)
43{
44 int ret;
45 struct nfs_net *nn = net_generic(net, nfs_net_id);
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;
51 nn->nfs_callback_tcpport = ret;
52 dprintk("NFS: Callback listener port = %u (af %u, net %p)\n",
53 nn->nfs_callback_tcpport, PF_INET, net);
54
55 ret = svc_create_xprt(serv, "tcp", net, PF_INET6,
56 nfs_callback_set_tcpport, SVC_SOCK_ANONYMOUS);
57 if (ret > 0) {
58 nn->nfs_callback_tcpport6 = ret;
59 dprintk("NFS: Callback listener port = %u (af %u, net %p)\n",
60 nn->nfs_callback_tcpport6, PF_INET6, net);
61 } else if (ret != -EAFNOSUPPORT)
62 goto out_err;
63 return 0;
64
65out_err:
66 return (ret) ? ret : -ENOMEM;
67}
68
69
70
71
72static int
73nfs4_callback_svc(void *vrqstp)
74{
75 int err;
76 struct svc_rqst *rqstp = vrqstp;
77
78 set_freezable();
79
80 while (!kthread_should_stop()) {
81
82
83
84 err = svc_recv(rqstp, MAX_SCHEDULE_TIMEOUT);
85 if (err == -EAGAIN || err == -EINTR)
86 continue;
87 svc_process(rqstp);
88 }
89 return 0;
90}
91
92
93
94
95static struct svc_rqst *
96nfs4_callback_up(struct svc_serv *serv)
97{
98 return svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE);
99}
100
101#if defined(CONFIG_NFS_V4_1)
102static int nfs41_callback_up_net(struct svc_serv *serv, struct net *net)
103{
104
105
106
107
108
109 return svc_create_xprt(serv, "tcp-bc", net, PF_INET, 0,
110 SVC_SOCK_ANONYMOUS);
111}
112
113
114
115
116static int
117nfs41_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
127 while (!kthread_should_stop()) {
128 if (try_to_freeze())
129 continue;
130
131 prepare_to_wait(&serv->sv_cb_waitq, &wq, TASK_INTERRUPTIBLE);
132 spin_lock_bh(&serv->sv_cb_lock);
133 if (!list_empty(&serv->sv_cb_list)) {
134 req = list_first_entry(&serv->sv_cb_list,
135 struct rpc_rqst, rq_bc_list);
136 list_del(&req->rq_bc_list);
137 spin_unlock_bh(&serv->sv_cb_lock);
138 dprintk("Invoking bc_svc_process()\n");
139 error = bc_svc_process(serv, req, rqstp);
140 dprintk("bc_svc_process() returned w/ error code= %d\n",
141 error);
142 } else {
143 spin_unlock_bh(&serv->sv_cb_lock);
144 schedule();
145 }
146 finish_wait(&serv->sv_cb_waitq, &wq);
147 }
148 return 0;
149}
150
151
152
153
154static struct svc_rqst *
155nfs41_callback_up(struct svc_serv *serv)
156{
157 struct svc_rqst *rqstp;
158
159 INIT_LIST_HEAD(&serv->sv_cb_list);
160 spin_lock_init(&serv->sv_cb_lock);
161 init_waitqueue_head(&serv->sv_cb_waitq);
162 rqstp = svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE);
163 if (IS_ERR(rqstp)) {
164 svc_xprt_put(serv->sv_bc_xprt);
165 serv->sv_bc_xprt = NULL;
166 }
167 dprintk("--> %s return %d\n", __func__, PTR_ERR_OR_ZERO(rqstp));
168 return rqstp;
169}
170
171static void nfs_minorversion_callback_svc_setup(struct svc_serv *serv,
172 struct svc_rqst **rqstpp, int (**callback_svc)(void *vrqstp))
173{
174 *rqstpp = nfs41_callback_up(serv);
175 *callback_svc = nfs41_callback_svc;
176}
177
178static inline void nfs_callback_bc_serv(u32 minorversion, struct rpc_xprt *xprt,
179 struct svc_serv *serv)
180{
181 if (minorversion)
182
183
184
185
186 xprt->bc_serv = serv;
187}
188#else
189static int nfs41_callback_up_net(struct svc_serv *serv, struct net *net)
190{
191 return 0;
192}
193
194static void nfs_minorversion_callback_svc_setup(struct svc_serv *serv,
195 struct svc_rqst **rqstpp, int (**callback_svc)(void *vrqstp))
196{
197 *rqstpp = ERR_PTR(-ENOTSUPP);
198 *callback_svc = ERR_PTR(-ENOTSUPP);
199}
200
201static inline void nfs_callback_bc_serv(u32 minorversion, struct rpc_xprt *xprt,
202 struct svc_serv *serv)
203{
204}
205#endif
206
207static int nfs_callback_start_svc(int minorversion, struct rpc_xprt *xprt,
208 struct svc_serv *serv)
209{
210 struct svc_rqst *rqstp;
211 int (*callback_svc)(void *vrqstp);
212 struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion];
213 int ret;
214
215 nfs_callback_bc_serv(minorversion, xprt, serv);
216
217 if (cb_info->task)
218 return 0;
219
220 switch (minorversion) {
221 case 0:
222
223 rqstp = nfs4_callback_up(serv);
224 callback_svc = nfs4_callback_svc;
225 break;
226 default:
227 nfs_minorversion_callback_svc_setup(serv,
228 &rqstp, &callback_svc);
229 }
230
231 if (IS_ERR(rqstp))
232 return PTR_ERR(rqstp);
233
234 svc_sock_update_bufs(serv);
235
236 cb_info->serv = serv;
237 cb_info->rqst = rqstp;
238 cb_info->task = kthread_run(callback_svc, cb_info->rqst,
239 "nfsv4.%u-svc", minorversion);
240 if (IS_ERR(cb_info->task)) {
241 ret = PTR_ERR(cb_info->task);
242 svc_exit_thread(cb_info->rqst);
243 cb_info->rqst = NULL;
244 cb_info->task = NULL;
245 return ret;
246 }
247 dprintk("nfs_callback_up: service started\n");
248 return 0;
249}
250
251static void nfs_callback_down_net(u32 minorversion, struct svc_serv *serv, struct net *net)
252{
253 struct nfs_net *nn = net_generic(net, nfs_net_id);
254
255 if (--nn->cb_users[minorversion])
256 return;
257
258 dprintk("NFS: destroy per-net callback data; net=%p\n", net);
259 svc_shutdown_net(serv, net);
260}
261
262static int nfs_callback_up_net(int minorversion, struct svc_serv *serv, struct net *net)
263{
264 struct nfs_net *nn = net_generic(net, nfs_net_id);
265 int ret;
266
267 if (nn->cb_users[minorversion]++)
268 return 0;
269
270 dprintk("NFS: create per-net callback data; net=%p\n", net);
271
272 ret = svc_bind(serv, net);
273 if (ret < 0) {
274 printk(KERN_WARNING "NFS: bind callback service failed\n");
275 goto err_bind;
276 }
277
278 switch (minorversion) {
279 case 0:
280 ret = nfs4_callback_up_net(serv, net);
281 break;
282 case 1:
283 case 2:
284 ret = nfs41_callback_up_net(serv, net);
285 break;
286 default:
287 printk(KERN_ERR "NFS: unknown callback version: %d\n",
288 minorversion);
289 ret = -EINVAL;
290 break;
291 }
292
293 if (ret < 0) {
294 printk(KERN_ERR "NFS: callback service start failed\n");
295 goto err_socks;
296 }
297 return 0;
298
299err_socks:
300 svc_rpcb_cleanup(serv, net);
301err_bind:
302 dprintk("NFS: Couldn't create callback socket: err = %d; "
303 "net = %p\n", ret, net);
304 return ret;
305}
306
307static struct svc_serv *nfs_callback_create_svc(int minorversion)
308{
309 struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion];
310 struct svc_serv *serv;
311
312
313
314
315 if (cb_info->task) {
316
317
318
319
320 svc_get(cb_info->serv);
321 return cb_info->serv;
322 }
323
324
325
326
327
328 if (cb_info->users)
329 printk(KERN_WARNING "nfs_callback_create_svc: no kthread, %d users??\n",
330 cb_info->users);
331
332 serv = svc_create(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE, NULL);
333 if (!serv) {
334 printk(KERN_ERR "nfs_callback_create_svc: create service failed\n");
335 return ERR_PTR(-ENOMEM);
336 }
337
338
339
340 serv->sv_maxconn = 1024;
341 dprintk("nfs_callback_create_svc: service created\n");
342 return serv;
343}
344
345
346
347
348int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt)
349{
350 struct svc_serv *serv;
351 struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion];
352 int ret;
353 struct net *net = xprt->xprt_net;
354
355 mutex_lock(&nfs_callback_mutex);
356
357 serv = nfs_callback_create_svc(minorversion);
358 if (IS_ERR(serv)) {
359 ret = PTR_ERR(serv);
360 goto err_create;
361 }
362
363 ret = nfs_callback_up_net(minorversion, serv, net);
364 if (ret < 0)
365 goto err_net;
366
367 ret = nfs_callback_start_svc(minorversion, xprt, serv);
368 if (ret < 0)
369 goto err_start;
370
371 cb_info->users++;
372
373
374
375
376
377
378err_net:
379 svc_destroy(serv);
380err_create:
381 mutex_unlock(&nfs_callback_mutex);
382 return ret;
383
384err_start:
385 nfs_callback_down_net(minorversion, serv, net);
386 dprintk("NFS: Couldn't create server thread; err = %d\n", ret);
387 goto err_net;
388}
389
390
391
392
393void nfs_callback_down(int minorversion, struct net *net)
394{
395 struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion];
396
397 mutex_lock(&nfs_callback_mutex);
398 nfs_callback_down_net(minorversion, cb_info->serv, net);
399 cb_info->users--;
400 if (cb_info->users == 0 && cb_info->task != NULL) {
401 kthread_stop(cb_info->task);
402 dprintk("nfs_callback_down: service stopped\n");
403 svc_exit_thread(cb_info->rqst);
404 dprintk("nfs_callback_down: service destroyed\n");
405 cb_info->serv = NULL;
406 cb_info->rqst = NULL;
407 cb_info->task = NULL;
408 }
409 mutex_unlock(&nfs_callback_mutex);
410}
411
412
413int
414check_gss_callback_principal(struct nfs_client *clp, struct svc_rqst *rqstp)
415{
416 char *p = rqstp->rq_cred.cr_principal;
417
418 if (rqstp->rq_authop->flavour != RPC_AUTH_GSS)
419 return 1;
420
421
422 if (clp->cl_minorversion != 0)
423 return 0;
424
425
426
427
428 if (p == NULL)
429 return 0;
430
431
432
433
434
435 if (clp->cl_acceptor)
436 return !strcmp(p, clp->cl_acceptor);
437
438
439
440
441
442
443
444
445 if (memcmp(p, "nfs@", 4) != 0)
446 return 0;
447 p += 4;
448 if (strcmp(p, clp->cl_hostname) != 0)
449 return 0;
450 return 1;
451}
452
453
454
455
456
457
458
459
460
461
462static int nfs_callback_authenticate(struct svc_rqst *rqstp)
463{
464 switch (rqstp->rq_authop->flavour) {
465 case RPC_AUTH_NULL:
466 if (rqstp->rq_proc != CB_NULL)
467 return SVC_DROP;
468 break;
469 case RPC_AUTH_GSS:
470
471 if (svc_is_backchannel(rqstp))
472 return SVC_DROP;
473 }
474 return SVC_OK;
475}
476
477
478
479
480static struct svc_version *nfs4_callback_version[] = {
481 [1] = &nfs4_callback_version1,
482 [4] = &nfs4_callback_version4,
483};
484
485static struct svc_stat nfs4_callback_stats;
486
487static struct svc_program nfs4_callback_program = {
488 .pg_prog = NFS4_CALLBACK,
489 .pg_nvers = ARRAY_SIZE(nfs4_callback_version),
490 .pg_vers = nfs4_callback_version,
491 .pg_name = "NFSv4 callback",
492 .pg_class = "nfs",
493 .pg_stats = &nfs4_callback_stats,
494 .pg_authenticate = nfs_callback_authenticate,
495};
496