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Linux 3.9-rc4
[linux-2.6/cjktty.git] / net / sunrpc / clnt.c
blobdcc446e7fbf6b6c0d639e2889438bc5f2aa65df2
1 /*
2 * linux/net/sunrpc/clnt.c
3 *
4 * This file contains the high-level RPC interface.
5 * It is modeled as a finite state machine to support both synchronous
6 * and asynchronous requests.
7 *
8 * - RPC header generation and argument serialization.
9 * - Credential refresh.
10 * - TCP connect handling.
11 * - Retry of operation when it is suspected the operation failed because
12 * of uid squashing on the server, or when the credentials were stale
13 * and need to be refreshed, or when a packet was damaged in transit.
14 * This may be have to be moved to the VFS layer.
15 *
16 * Copyright (C) 1992,1993 Rick Sladkey <jrs@world.std.com>
17 * Copyright (C) 1995,1996 Olaf Kirch <okir@monad.swb.de>
18 */
19
20
21 #include <linux/module.h>
22 #include <linux/types.h>
23 #include <linux/kallsyms.h>
24 #include <linux/mm.h>
25 #include <linux/namei.h>
26 #include <linux/mount.h>
27 #include <linux/slab.h>
28 #include <linux/utsname.h>
29 #include <linux/workqueue.h>
30 #include <linux/in.h>
31 #include <linux/in6.h>
32 #include <linux/un.h>
33 #include <linux/rcupdate.h>
34
35 #include <linux/sunrpc/clnt.h>
36 #include <linux/sunrpc/addr.h>
37 #include <linux/sunrpc/rpc_pipe_fs.h>
38 #include <linux/sunrpc/metrics.h>
39 #include <linux/sunrpc/bc_xprt.h>
40 #include <trace/events/sunrpc.h>
41
42 #include "sunrpc.h"
43 #include "netns.h"
44
45 #ifdef RPC_DEBUG
46 # define RPCDBG_FACILITY RPCDBG_CALL
47 #endif
48
49 #define dprint_status(t) \
50 dprintk("RPC: %5u %s (status %d)\n", t->tk_pid, \
51 __func__, t->tk_status)
52
53 /*
54 * All RPC clients are linked into this list
55 */
56
57 static DECLARE_WAIT_QUEUE_HEAD(destroy_wait);
58
59
60 static void call_start(struct rpc_task *task);
61 static void call_reserve(struct rpc_task *task);
62 static void call_reserveresult(struct rpc_task *task);
63 static void call_allocate(struct rpc_task *task);
64 static void call_decode(struct rpc_task *task);
65 static void call_bind(struct rpc_task *task);
66 static void call_bind_status(struct rpc_task *task);
67 static void call_transmit(struct rpc_task *task);
68 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
69 static void call_bc_transmit(struct rpc_task *task);
70 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
71 static void call_status(struct rpc_task *task);
72 static void call_transmit_status(struct rpc_task *task);
73 static void call_refresh(struct rpc_task *task);
74 static void call_refreshresult(struct rpc_task *task);
75 static void call_timeout(struct rpc_task *task);
76 static void call_connect(struct rpc_task *task);
77 static void call_connect_status(struct rpc_task *task);
78
79 static __be32 *rpc_encode_header(struct rpc_task *task);
80 static __be32 *rpc_verify_header(struct rpc_task *task);
81 static int rpc_ping(struct rpc_clnt *clnt);
82
83 static void rpc_register_client(struct rpc_clnt *clnt)
84 {
85 struct net *net = rpc_net_ns(clnt);
86 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
87
88 spin_lock(&sn->rpc_client_lock);
89 list_add(&clnt->cl_clients, &sn->all_clients);
90 spin_unlock(&sn->rpc_client_lock);
91 }
92
93 static void rpc_unregister_client(struct rpc_clnt *clnt)
94 {
95 struct net *net = rpc_net_ns(clnt);
96 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
97
98 spin_lock(&sn->rpc_client_lock);
99 list_del(&clnt->cl_clients);
100 spin_unlock(&sn->rpc_client_lock);
101 }
102
103 static void __rpc_clnt_remove_pipedir(struct rpc_clnt *clnt)
104 {
105 if (clnt->cl_dentry) {
106 if (clnt->cl_auth && clnt->cl_auth->au_ops->pipes_destroy)
107 clnt->cl_auth->au_ops->pipes_destroy(clnt->cl_auth);
108 rpc_remove_client_dir(clnt->cl_dentry);
109 }
110 clnt->cl_dentry = NULL;
111 }
112
113 static void rpc_clnt_remove_pipedir(struct rpc_clnt *clnt)
114 {
115 struct net *net = rpc_net_ns(clnt);
116 struct super_block *pipefs_sb;
117
118 pipefs_sb = rpc_get_sb_net(net);
119 if (pipefs_sb) {
120 __rpc_clnt_remove_pipedir(clnt);
121 rpc_put_sb_net(net);
122 }
123 }
124
125 static struct dentry *rpc_setup_pipedir_sb(struct super_block *sb,
126 struct rpc_clnt *clnt,
127 const char *dir_name)
128 {
129 static uint32_t clntid;
130 char name[15];
131 struct qstr q = { .name = name };
132 struct dentry *dir, *dentry;
133 int error;
134
135 dir = rpc_d_lookup_sb(sb, dir_name);
136 if (dir == NULL) {
137 pr_info("RPC: pipefs directory doesn't exist: %s\n", dir_name);
138 return dir;
139 }
140 for (;;) {
141 q.len = snprintf(name, sizeof(name), "clnt%x", (unsigned int)clntid++);
142 name[sizeof(name) - 1] = '\0';
143 q.hash = full_name_hash(q.name, q.len);
144 dentry = rpc_create_client_dir(dir, &q, clnt);
145 if (!IS_ERR(dentry))
146 break;
147 error = PTR_ERR(dentry);
148 if (error != -EEXIST) {
149 printk(KERN_INFO "RPC: Couldn't create pipefs entry"
150 " %s/%s, error %d\n",
151 dir_name, name, error);
152 break;
153 }
154 }
155 dput(dir);
156 return dentry;
157 }
158
159 static int
160 rpc_setup_pipedir(struct rpc_clnt *clnt, const char *dir_name)
161 {
162 struct net *net = rpc_net_ns(clnt);
163 struct super_block *pipefs_sb;
164 struct dentry *dentry;
165
166 clnt->cl_dentry = NULL;
167 if (dir_name == NULL)
168 return 0;
169 pipefs_sb = rpc_get_sb_net(net);
170 if (!pipefs_sb)
171 return 0;
172 dentry = rpc_setup_pipedir_sb(pipefs_sb, clnt, dir_name);
173 rpc_put_sb_net(net);
174 if (IS_ERR(dentry))
175 return PTR_ERR(dentry);
176 clnt->cl_dentry = dentry;
177 return 0;
178 }
179
180 static inline int rpc_clnt_skip_event(struct rpc_clnt *clnt, unsigned long event)
181 {
182 if (((event == RPC_PIPEFS_MOUNT) && clnt->cl_dentry) ||
183 ((event == RPC_PIPEFS_UMOUNT) && !clnt->cl_dentry))
184 return 1;
185 return 0;
186 }
187
188 static int __rpc_clnt_handle_event(struct rpc_clnt *clnt, unsigned long event,
189 struct super_block *sb)
190 {
191 struct dentry *dentry;
192 int err = 0;
193
194 switch (event) {
195 case RPC_PIPEFS_MOUNT:
196 dentry = rpc_setup_pipedir_sb(sb, clnt,
197 clnt->cl_program->pipe_dir_name);
198 if (!dentry)
199 return -ENOENT;
200 if (IS_ERR(dentry))
201 return PTR_ERR(dentry);
202 clnt->cl_dentry = dentry;
203 if (clnt->cl_auth->au_ops->pipes_create) {
204 err = clnt->cl_auth->au_ops->pipes_create(clnt->cl_auth);
205 if (err)
206 __rpc_clnt_remove_pipedir(clnt);
207 }
208 break;
209 case RPC_PIPEFS_UMOUNT:
210 __rpc_clnt_remove_pipedir(clnt);
211 break;
212 default:
213 printk(KERN_ERR "%s: unknown event: %ld\n", __func__, event);
214 return -ENOTSUPP;
215 }
216 return err;
217 }
218
219 static int __rpc_pipefs_event(struct rpc_clnt *clnt, unsigned long event,
220 struct super_block *sb)
221 {
222 int error = 0;
223
224 for (;; clnt = clnt->cl_parent) {
225 if (!rpc_clnt_skip_event(clnt, event))
226 error = __rpc_clnt_handle_event(clnt, event, sb);
227 if (error || clnt == clnt->cl_parent)
228 break;
229 }
230 return error;
231 }
232
233 static struct rpc_clnt *rpc_get_client_for_event(struct net *net, int event)
234 {
235 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
236 struct rpc_clnt *clnt;
237
238 spin_lock(&sn->rpc_client_lock);
239 list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
240 if (clnt->cl_program->pipe_dir_name == NULL)
241 continue;
242 if (rpc_clnt_skip_event(clnt, event))
243 continue;
244 if (atomic_inc_not_zero(&clnt->cl_count) == 0)
245 continue;
246 spin_unlock(&sn->rpc_client_lock);
247 return clnt;
248 }
249 spin_unlock(&sn->rpc_client_lock);
250 return NULL;
251 }
252
253 static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
254 void *ptr)
255 {
256 struct super_block *sb = ptr;
257 struct rpc_clnt *clnt;
258 int error = 0;
259
260 while ((clnt = rpc_get_client_for_event(sb->s_fs_info, event))) {
261 error = __rpc_pipefs_event(clnt, event, sb);
262 rpc_release_client(clnt);
263 if (error)
264 break;
265 }
266 return error;
267 }
268
269 static struct notifier_block rpc_clients_block = {
270 .notifier_call = rpc_pipefs_event,
271 .priority = SUNRPC_PIPEFS_RPC_PRIO,
272 };
273
274 int rpc_clients_notifier_register(void)
275 {
276 return rpc_pipefs_notifier_register(&rpc_clients_block);
277 }
278
279 void rpc_clients_notifier_unregister(void)
280 {
281 return rpc_pipefs_notifier_unregister(&rpc_clients_block);
282 }
283
284 static void rpc_clnt_set_nodename(struct rpc_clnt *clnt, const char *nodename)
285 {
286 clnt->cl_nodelen = strlen(nodename);
287 if (clnt->cl_nodelen > UNX_MAXNODENAME)
288 clnt->cl_nodelen = UNX_MAXNODENAME;
289 memcpy(clnt->cl_nodename, nodename, clnt->cl_nodelen);
290 }
291
292 static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, struct rpc_xprt *xprt)
293 {
294 const struct rpc_program *program = args->program;
295 const struct rpc_version *version;
296 struct rpc_clnt *clnt = NULL;
297 struct rpc_auth *auth;
298 int err;
299
300 /* sanity check the name before trying to print it */
301 dprintk("RPC: creating %s client for %s (xprt %p)\n",
302 program->name, args->servername, xprt);
303
304 err = rpciod_up();
305 if (err)
306 goto out_no_rpciod;
307 err = -EINVAL;
308 if (!xprt)
309 goto out_no_xprt;
310
311 if (args->version >= program->nrvers)
312 goto out_err;
313 version = program->version[args->version];
314 if (version == NULL)
315 goto out_err;
316
317 err = -ENOMEM;
318 clnt = kzalloc(sizeof(*clnt), GFP_KERNEL);
319 if (!clnt)
320 goto out_err;
321 clnt->cl_parent = clnt;
322
323 rcu_assign_pointer(clnt->cl_xprt, xprt);
324 clnt->cl_procinfo = version->procs;
325 clnt->cl_maxproc = version->nrprocs;
326 clnt->cl_protname = program->name;
327 clnt->cl_prog = args->prognumber ? : program->number;
328 clnt->cl_vers = version->number;
329 clnt->cl_stats = program->stats;
330 clnt->cl_metrics = rpc_alloc_iostats(clnt);
331 err = -ENOMEM;
332 if (clnt->cl_metrics == NULL)
333 goto out_no_stats;
334 clnt->cl_program = program;
335 INIT_LIST_HEAD(&clnt->cl_tasks);
336 spin_lock_init(&clnt->cl_lock);
337
338 if (!xprt_bound(xprt))
339 clnt->cl_autobind = 1;
340
341 clnt->cl_timeout = xprt->timeout;
342 if (args->timeout != NULL) {
343 memcpy(&clnt->cl_timeout_default, args->timeout,
344 sizeof(clnt->cl_timeout_default));
345 clnt->cl_timeout = &clnt->cl_timeout_default;
346 }
347
348 clnt->cl_rtt = &clnt->cl_rtt_default;
349 rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval);
350 clnt->cl_principal = NULL;
351 if (args->client_name) {
352 clnt->cl_principal = kstrdup(args->client_name, GFP_KERNEL);
353 if (!clnt->cl_principal)
354 goto out_no_principal;
355 }
356
357 atomic_set(&clnt->cl_count, 1);
358
359 err = rpc_setup_pipedir(clnt, program->pipe_dir_name);
360 if (err < 0)
361 goto out_no_path;
362
363 auth = rpcauth_create(args->authflavor, clnt);
364 if (IS_ERR(auth)) {
365 printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n",
366 args->authflavor);
367 err = PTR_ERR(auth);
368 goto out_no_auth;
369 }
370
371 /* save the nodename */
372 rpc_clnt_set_nodename(clnt, utsname()->nodename);
373 rpc_register_client(clnt);
374 return clnt;
375
376 out_no_auth:
377 rpc_clnt_remove_pipedir(clnt);
378 out_no_path:
379 kfree(clnt->cl_principal);
380 out_no_principal:
381 rpc_free_iostats(clnt->cl_metrics);
382 out_no_stats:
383 kfree(clnt);
384 out_err:
385 xprt_put(xprt);
386 out_no_xprt:
387 rpciod_down();
388 out_no_rpciod:
389 return ERR_PTR(err);
390 }
391
392 /**
393 * rpc_create - create an RPC client and transport with one call
394 * @args: rpc_clnt create argument structure
395 *
396 * Creates and initializes an RPC transport and an RPC client.
397 *
398 * It can ping the server in order to determine if it is up, and to see if
399 * it supports this program and version. RPC_CLNT_CREATE_NOPING disables
400 * this behavior so asynchronous tasks can also use rpc_create.
401 */
402 struct rpc_clnt *rpc_create(struct rpc_create_args *args)
403 {
404 struct rpc_xprt *xprt;
405 struct rpc_clnt *clnt;
406 struct xprt_create xprtargs = {
407 .net = args->net,
408 .ident = args->protocol,
409 .srcaddr = args->saddress,
410 .dstaddr = args->address,
411 .addrlen = args->addrsize,
412 .servername = args->servername,
413 .bc_xprt = args->bc_xprt,
414 };
415 char servername[48];
416
417 /*
418 * If the caller chooses not to specify a hostname, whip
419 * up a string representation of the passed-in address.
420 */
421 if (xprtargs.servername == NULL) {
422 struct sockaddr_un *sun =
423 (struct sockaddr_un *)args->address;
424 struct sockaddr_in *sin =
425 (struct sockaddr_in *)args->address;
426 struct sockaddr_in6 *sin6 =
427 (struct sockaddr_in6 *)args->address;
428
429 servername[0] = '\0';
430 switch (args->address->sa_family) {
431 case AF_LOCAL:
432 snprintf(servername, sizeof(servername), "%s",
433 sun->sun_path);
434 break;
435 case AF_INET:
436 snprintf(servername, sizeof(servername), "%pI4",
437 &sin->sin_addr.s_addr);
438 break;
439 case AF_INET6:
440 snprintf(servername, sizeof(servername), "%pI6",
441 &sin6->sin6_addr);
442 break;
443 default:
444 /* caller wants default server name, but
445 * address family isn't recognized. */
446 return ERR_PTR(-EINVAL);
447 }
448 xprtargs.servername = servername;
449 }
450
451 xprt = xprt_create_transport(&xprtargs);
452 if (IS_ERR(xprt))
453 return (struct rpc_clnt *)xprt;
454
455 /*
456 * By default, kernel RPC client connects from a reserved port.
457 * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters,
458 * but it is always enabled for rpciod, which handles the connect
459 * operation.
460 */
461 xprt->resvport = 1;
462 if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT)
463 xprt->resvport = 0;
464
465 clnt = rpc_new_client(args, xprt);
466 if (IS_ERR(clnt))
467 return clnt;
468
469 if (!(args->flags & RPC_CLNT_CREATE_NOPING)) {
470 int err = rpc_ping(clnt);
471 if (err != 0) {
472 rpc_shutdown_client(clnt);
473 return ERR_PTR(err);
474 }
475 }
476
477 clnt->cl_softrtry = 1;
478 if (args->flags & RPC_CLNT_CREATE_HARDRTRY)
479 clnt->cl_softrtry = 0;
480
481 if (args->flags & RPC_CLNT_CREATE_AUTOBIND)
482 clnt->cl_autobind = 1;
483 if (args->flags & RPC_CLNT_CREATE_DISCRTRY)
484 clnt->cl_discrtry = 1;
485 if (!(args->flags & RPC_CLNT_CREATE_QUIET))
486 clnt->cl_chatty = 1;
487
488 return clnt;
489 }
490 EXPORT_SYMBOL_GPL(rpc_create);
491
492 /*
493 * This function clones the RPC client structure. It allows us to share the
494 * same transport while varying parameters such as the authentication
495 * flavour.
496 */
497 static struct rpc_clnt *__rpc_clone_client(struct rpc_create_args *args,
498 struct rpc_clnt *clnt)
499 {
500 struct rpc_xprt *xprt;
501 struct rpc_clnt *new;
502 int err;
503
504 err = -ENOMEM;
505 rcu_read_lock();
506 xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
507 rcu_read_unlock();
508 if (xprt == NULL)
509 goto out_err;
510 args->servername = xprt->servername;
511
512 new = rpc_new_client(args, xprt);
513 if (IS_ERR(new)) {
514 err = PTR_ERR(new);
515 goto out_put;
516 }
517
518 atomic_inc(&clnt->cl_count);
519 new->cl_parent = clnt;
520
521 /* Turn off autobind on clones */
522 new->cl_autobind = 0;
523 new->cl_softrtry = clnt->cl_softrtry;
524 new->cl_discrtry = clnt->cl_discrtry;
525 new->cl_chatty = clnt->cl_chatty;
526 return new;
527
528 out_put:
529 xprt_put(xprt);
530 out_err:
531 dprintk("RPC: %s: returned error %d\n", __func__, err);
532 return ERR_PTR(err);
533 }
534
535 /**
536 * rpc_clone_client - Clone an RPC client structure
537 *
538 * @clnt: RPC client whose parameters are copied
539 *
540 * Returns a fresh RPC client or an ERR_PTR.
541 */
542 struct rpc_clnt *rpc_clone_client(struct rpc_clnt *clnt)
543 {
544 struct rpc_create_args args = {
545 .program = clnt->cl_program,
546 .prognumber = clnt->cl_prog,
547 .version = clnt->cl_vers,
548 .authflavor = clnt->cl_auth->au_flavor,
549 .client_name = clnt->cl_principal,
550 };
551 return __rpc_clone_client(&args, clnt);
552 }
553 EXPORT_SYMBOL_GPL(rpc_clone_client);
554
555 /**
556 * rpc_clone_client_set_auth - Clone an RPC client structure and set its auth
557 *
558 * @clnt: RPC client whose parameters are copied
559 * @flavor: security flavor for new client
560 *
561 * Returns a fresh RPC client or an ERR_PTR.
562 */
563 struct rpc_clnt *
564 rpc_clone_client_set_auth(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
565 {
566 struct rpc_create_args args = {
567 .program = clnt->cl_program,
568 .prognumber = clnt->cl_prog,
569 .version = clnt->cl_vers,
570 .authflavor = flavor,
571 .client_name = clnt->cl_principal,
572 };
573 return __rpc_clone_client(&args, clnt);
574 }
575 EXPORT_SYMBOL_GPL(rpc_clone_client_set_auth);
576
577 /*
578 * Kill all tasks for the given client.
579 * XXX: kill their descendants as well?
580 */
581 void rpc_killall_tasks(struct rpc_clnt *clnt)
582 {
583 struct rpc_task *rovr;
584
585
586 if (list_empty(&clnt->cl_tasks))
587 return;
588 dprintk("RPC: killing all tasks for client %p\n", clnt);
589 /*
590 * Spin lock all_tasks to prevent changes...
591 */
592 spin_lock(&clnt->cl_lock);
593 list_for_each_entry(rovr, &clnt->cl_tasks, tk_task) {
594 if (!RPC_IS_ACTIVATED(rovr))
595 continue;
596 if (!(rovr->tk_flags & RPC_TASK_KILLED)) {
597 rovr->tk_flags |= RPC_TASK_KILLED;
598 rpc_exit(rovr, -EIO);
599 if (RPC_IS_QUEUED(rovr))
600 rpc_wake_up_queued_task(rovr->tk_waitqueue,
601 rovr);
602 }
603 }
604 spin_unlock(&clnt->cl_lock);
605 }
606 EXPORT_SYMBOL_GPL(rpc_killall_tasks);
607
608 /*
609 * Properly shut down an RPC client, terminating all outstanding
610 * requests.
611 */
612 void rpc_shutdown_client(struct rpc_clnt *clnt)
613 {
614 might_sleep();
615
616 dprintk_rcu("RPC: shutting down %s client for %s\n",
617 clnt->cl_protname,
618 rcu_dereference(clnt->cl_xprt)->servername);
619
620 while (!list_empty(&clnt->cl_tasks)) {
621 rpc_killall_tasks(clnt);
622 wait_event_timeout(destroy_wait,
623 list_empty(&clnt->cl_tasks), 1*HZ);
624 }
625
626 rpc_release_client(clnt);
627 }
628 EXPORT_SYMBOL_GPL(rpc_shutdown_client);
629
630 /*
631 * Free an RPC client
632 */
633 static void
634 rpc_free_client(struct rpc_clnt *clnt)
635 {
636 dprintk_rcu("RPC: destroying %s client for %s\n",
637 clnt->cl_protname,
638 rcu_dereference(clnt->cl_xprt)->servername);
639 if (clnt->cl_parent != clnt)
640 rpc_release_client(clnt->cl_parent);
641 rpc_unregister_client(clnt);
642 rpc_clnt_remove_pipedir(clnt);
643 rpc_free_iostats(clnt->cl_metrics);
644 kfree(clnt->cl_principal);
645 clnt->cl_metrics = NULL;
646 xprt_put(rcu_dereference_raw(clnt->cl_xprt));
647 rpciod_down();
648 kfree(clnt);
649 }
650
651 /*
652 * Free an RPC client
653 */
654 static void
655 rpc_free_auth(struct rpc_clnt *clnt)
656 {
657 if (clnt->cl_auth == NULL) {
658 rpc_free_client(clnt);
659 return;
660 }
661
662 /*
663 * Note: RPCSEC_GSS may need to send NULL RPC calls in order to
664 * release remaining GSS contexts. This mechanism ensures
665 * that it can do so safely.
666 */
667 atomic_inc(&clnt->cl_count);
668 rpcauth_release(clnt->cl_auth);
669 clnt->cl_auth = NULL;
670 if (atomic_dec_and_test(&clnt->cl_count))
671 rpc_free_client(clnt);
672 }
673
674 /*
675 * Release reference to the RPC client
676 */
677 void
678 rpc_release_client(struct rpc_clnt *clnt)
679 {
680 dprintk("RPC: rpc_release_client(%p)\n", clnt);
681
682 if (list_empty(&clnt->cl_tasks))
683 wake_up(&destroy_wait);
684 if (atomic_dec_and_test(&clnt->cl_count))
685 rpc_free_auth(clnt);
686 }
687
688 /**
689 * rpc_bind_new_program - bind a new RPC program to an existing client
690 * @old: old rpc_client
691 * @program: rpc program to set
692 * @vers: rpc program version
693 *
694 * Clones the rpc client and sets up a new RPC program. This is mainly
695 * of use for enabling different RPC programs to share the same transport.
696 * The Sun NFSv2/v3 ACL protocol can do this.
697 */
698 struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old,
699 const struct rpc_program *program,
700 u32 vers)
701 {
702 struct rpc_create_args args = {
703 .program = program,
704 .prognumber = program->number,
705 .version = vers,
706 .authflavor = old->cl_auth->au_flavor,
707 .client_name = old->cl_principal,
708 };
709 struct rpc_clnt *clnt;
710 int err;
711
712 clnt = __rpc_clone_client(&args, old);
713 if (IS_ERR(clnt))
714 goto out;
715 err = rpc_ping(clnt);
716 if (err != 0) {
717 rpc_shutdown_client(clnt);
718 clnt = ERR_PTR(err);
719 }
720 out:
721 return clnt;
722 }
723 EXPORT_SYMBOL_GPL(rpc_bind_new_program);
724
725 void rpc_task_release_client(struct rpc_task *task)
726 {
727 struct rpc_clnt *clnt = task->tk_client;
728
729 if (clnt != NULL) {
730 /* Remove from client task list */
731 spin_lock(&clnt->cl_lock);
732 list_del(&task->tk_task);
733 spin_unlock(&clnt->cl_lock);
734 task->tk_client = NULL;
735
736 rpc_release_client(clnt);
737 }
738 }
739
740 static
741 void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt)
742 {
743 if (clnt != NULL) {
744 rpc_task_release_client(task);
745 task->tk_client = clnt;
746 atomic_inc(&clnt->cl_count);
747 if (clnt->cl_softrtry)
748 task->tk_flags |= RPC_TASK_SOFT;
749 if (sk_memalloc_socks()) {
750 struct rpc_xprt *xprt;
751
752 rcu_read_lock();
753 xprt = rcu_dereference(clnt->cl_xprt);
754 if (xprt->swapper)
755 task->tk_flags |= RPC_TASK_SWAPPER;
756 rcu_read_unlock();
757 }
758 /* Add to the client's list of all tasks */
759 spin_lock(&clnt->cl_lock);
760 list_add_tail(&task->tk_task, &clnt->cl_tasks);
761 spin_unlock(&clnt->cl_lock);
762 }
763 }
764
765 void rpc_task_reset_client(struct rpc_task *task, struct rpc_clnt *clnt)
766 {
767 rpc_task_release_client(task);
768 rpc_task_set_client(task, clnt);
769 }
770 EXPORT_SYMBOL_GPL(rpc_task_reset_client);
771
772
773 static void
774 rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg)
775 {
776 if (msg != NULL) {
777 task->tk_msg.rpc_proc = msg->rpc_proc;
778 task->tk_msg.rpc_argp = msg->rpc_argp;
779 task->tk_msg.rpc_resp = msg->rpc_resp;
780 if (msg->rpc_cred != NULL)
781 task->tk_msg.rpc_cred = get_rpccred(msg->rpc_cred);
782 }
783 }
784
785 /*
786 * Default callback for async RPC calls
787 */
788 static void
789 rpc_default_callback(struct rpc_task *task, void *data)
790 {
791 }
792
793 static const struct rpc_call_ops rpc_default_ops = {
794 .rpc_call_done = rpc_default_callback,
795 };
796
797 /**
798 * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it
799 * @task_setup_data: pointer to task initialisation data
800 */
801 struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data)
802 {
803 struct rpc_task *task;
804
805 task = rpc_new_task(task_setup_data);
806 if (IS_ERR(task))
807 goto out;
808
809 rpc_task_set_client(task, task_setup_data->rpc_client);
810 rpc_task_set_rpc_message(task, task_setup_data->rpc_message);
811
812 if (task->tk_action == NULL)
813 rpc_call_start(task);
814
815 atomic_inc(&task->tk_count);
816 rpc_execute(task);
817 out:
818 return task;
819 }
820 EXPORT_SYMBOL_GPL(rpc_run_task);
821
822 /**
823 * rpc_call_sync - Perform a synchronous RPC call
824 * @clnt: pointer to RPC client
825 * @msg: RPC call parameters
826 * @flags: RPC call flags
827 */
828 int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags)
829 {
830 struct rpc_task *task;
831 struct rpc_task_setup task_setup_data = {
832 .rpc_client = clnt,
833 .rpc_message = msg,
834 .callback_ops = &rpc_default_ops,
835 .flags = flags,
836 };
837 int status;
838
839 WARN_ON_ONCE(flags & RPC_TASK_ASYNC);
840 if (flags & RPC_TASK_ASYNC) {
841 rpc_release_calldata(task_setup_data.callback_ops,
842 task_setup_data.callback_data);
843 return -EINVAL;
844 }
845
846 task = rpc_run_task(&task_setup_data);
847 if (IS_ERR(task))
848 return PTR_ERR(task);
849 status = task->tk_status;
850 rpc_put_task(task);
851 return status;
852 }
853 EXPORT_SYMBOL_GPL(rpc_call_sync);
854
855 /**
856 * rpc_call_async - Perform an asynchronous RPC call
857 * @clnt: pointer to RPC client
858 * @msg: RPC call parameters
859 * @flags: RPC call flags
860 * @tk_ops: RPC call ops
861 * @data: user call data
862 */
863 int
864 rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags,
865 const struct rpc_call_ops *tk_ops, void *data)
866 {
867 struct rpc_task *task;
868 struct rpc_task_setup task_setup_data = {
869 .rpc_client = clnt,
870 .rpc_message = msg,
871 .callback_ops = tk_ops,
872 .callback_data = data,
873 .flags = flags|RPC_TASK_ASYNC,
874 };
875
876 task = rpc_run_task(&task_setup_data);
877 if (IS_ERR(task))
878 return PTR_ERR(task);
879 rpc_put_task(task);
880 return 0;
881 }
882 EXPORT_SYMBOL_GPL(rpc_call_async);
883
884 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
885 /**
886 * rpc_run_bc_task - Allocate a new RPC task for backchannel use, then run
887 * rpc_execute against it
888 * @req: RPC request
889 * @tk_ops: RPC call ops
890 */
891 struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req,
892 const struct rpc_call_ops *tk_ops)
893 {
894 struct rpc_task *task;
895 struct xdr_buf *xbufp = &req->rq_snd_buf;
896 struct rpc_task_setup task_setup_data = {
897 .callback_ops = tk_ops,
898 };
899
900 dprintk("RPC: rpc_run_bc_task req= %p\n", req);
901 /*
902 * Create an rpc_task to send the data
903 */
904 task = rpc_new_task(&task_setup_data);
905 if (IS_ERR(task)) {
906 xprt_free_bc_request(req);
907 goto out;
908 }
909 task->tk_rqstp = req;
910
911 /*
912 * Set up the xdr_buf length.
913 * This also indicates that the buffer is XDR encoded already.
914 */
915 xbufp->len = xbufp->head[0].iov_len + xbufp->page_len +
916 xbufp->tail[0].iov_len;
917
918 task->tk_action = call_bc_transmit;
919 atomic_inc(&task->tk_count);
920 WARN_ON_ONCE(atomic_read(&task->tk_count) != 2);
921 rpc_execute(task);
922
923 out:
924 dprintk("RPC: rpc_run_bc_task: task= %p\n", task);
925 return task;
926 }
927 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
928
929 void
930 rpc_call_start(struct rpc_task *task)
931 {
932 task->tk_action = call_start;
933 }
934 EXPORT_SYMBOL_GPL(rpc_call_start);
935
936 /**
937 * rpc_peeraddr - extract remote peer address from clnt's xprt
938 * @clnt: RPC client structure
939 * @buf: target buffer
940 * @bufsize: length of target buffer
941 *
942 * Returns the number of bytes that are actually in the stored address.
943 */
944 size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize)
945 {
946 size_t bytes;
947 struct rpc_xprt *xprt;
948
949 rcu_read_lock();
950 xprt = rcu_dereference(clnt->cl_xprt);
951
952 bytes = xprt->addrlen;
953 if (bytes > bufsize)
954 bytes = bufsize;
955 memcpy(buf, &xprt->addr, bytes);
956 rcu_read_unlock();
957
958 return bytes;
959 }
960 EXPORT_SYMBOL_GPL(rpc_peeraddr);
961
962 /**
963 * rpc_peeraddr2str - return remote peer address in printable format
964 * @clnt: RPC client structure
965 * @format: address format
966 *
967 * NB: the lifetime of the memory referenced by the returned pointer is
968 * the same as the rpc_xprt itself. As long as the caller uses this
969 * pointer, it must hold the RCU read lock.
970 */
971 const char *rpc_peeraddr2str(struct rpc_clnt *clnt,
972 enum rpc_display_format_t format)
973 {
974 struct rpc_xprt *xprt;
975
976 xprt = rcu_dereference(clnt->cl_xprt);
977
978 if (xprt->address_strings[format] != NULL)
979 return xprt->address_strings[format];
980 else
981 return "unprintable";
982 }
983 EXPORT_SYMBOL_GPL(rpc_peeraddr2str);
984
985 static const struct sockaddr_in rpc_inaddr_loopback = {
986 .sin_family = AF_INET,
987 .sin_addr.s_addr = htonl(INADDR_ANY),
988 };
989
990 static const struct sockaddr_in6 rpc_in6addr_loopback = {
991 .sin6_family = AF_INET6,
992 .sin6_addr = IN6ADDR_ANY_INIT,
993 };
994
995 /*
996 * Try a getsockname() on a connected datagram socket. Using a
997 * connected datagram socket prevents leaving a socket in TIME_WAIT.
998 * This conserves the ephemeral port number space.
999 *
1000 * Returns zero and fills in "buf" if successful; otherwise, a
1001 * negative errno is returned.
1002 */
1003 static int rpc_sockname(struct net *net, struct sockaddr *sap, size_t salen,
1004 struct sockaddr *buf, int buflen)
1005 {
1006 struct socket *sock;
1007 int err;
1008
1009 err = __sock_create(net, sap->sa_family,
1010 SOCK_DGRAM, IPPROTO_UDP, &sock, 1);
1011 if (err < 0) {
1012 dprintk("RPC: can't create UDP socket (%d)\n", err);
1013 goto out;
1014 }
1015
1016 switch (sap->sa_family) {
1017 case AF_INET:
1018 err = kernel_bind(sock,
1019 (struct sockaddr *)&rpc_inaddr_loopback,
1020 sizeof(rpc_inaddr_loopback));
1021 break;
1022 case AF_INET6:
1023 err = kernel_bind(sock,
1024 (struct sockaddr *)&rpc_in6addr_loopback,
1025 sizeof(rpc_in6addr_loopback));
1026 break;
1027 default:
1028 err = -EAFNOSUPPORT;
1029 goto out;
1030 }
1031 if (err < 0) {
1032 dprintk("RPC: can't bind UDP socket (%d)\n", err);
1033 goto out_release;
1034 }
1035
1036 err = kernel_connect(sock, sap, salen, 0);
1037 if (err < 0) {
1038 dprintk("RPC: can't connect UDP socket (%d)\n", err);
1039 goto out_release;
1040 }
1041
1042 err = kernel_getsockname(sock, buf, &buflen);
1043 if (err < 0) {
1044 dprintk("RPC: getsockname failed (%d)\n", err);
1045 goto out_release;
1046 }
1047
1048 err = 0;
1049 if (buf->sa_family == AF_INET6) {
1050 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)buf;
1051 sin6->sin6_scope_id = 0;
1052 }
1053 dprintk("RPC: %s succeeded\n", __func__);
1054
1055 out_release:
1056 sock_release(sock);
1057 out:
1058 return err;
1059 }
1060
1061 /*
1062 * Scraping a connected socket failed, so we don't have a useable
1063 * local address. Fallback: generate an address that will prevent
1064 * the server from calling us back.
1065 *
1066 * Returns zero and fills in "buf" if successful; otherwise, a
1067 * negative errno is returned.
1068 */
1069 static int rpc_anyaddr(int family, struct sockaddr *buf, size_t buflen)
1070 {
1071 switch (family) {
1072 case AF_INET:
1073 if (buflen < sizeof(rpc_inaddr_loopback))
1074 return -EINVAL;
1075 memcpy(buf, &rpc_inaddr_loopback,
1076 sizeof(rpc_inaddr_loopback));
1077 break;
1078 case AF_INET6:
1079 if (buflen < sizeof(rpc_in6addr_loopback))
1080 return -EINVAL;
1081 memcpy(buf, &rpc_in6addr_loopback,
1082 sizeof(rpc_in6addr_loopback));
1083 default:
1084 dprintk("RPC: %s: address family not supported\n",
1085 __func__);
1086 return -EAFNOSUPPORT;
1087 }
1088 dprintk("RPC: %s: succeeded\n", __func__);
1089 return 0;
1090 }
1091
1092 /**
1093 * rpc_localaddr - discover local endpoint address for an RPC client
1094 * @clnt: RPC client structure
1095 * @buf: target buffer
1096 * @buflen: size of target buffer, in bytes
1097 *
1098 * Returns zero and fills in "buf" and "buflen" if successful;
1099 * otherwise, a negative errno is returned.
1100 *
1101 * This works even if the underlying transport is not currently connected,
1102 * or if the upper layer never previously provided a source address.
1103 *
1104 * The result of this function call is transient: multiple calls in
1105 * succession may give different results, depending on how local
1106 * networking configuration changes over time.
1107 */
1108 int rpc_localaddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t buflen)
1109 {
1110 struct sockaddr_storage address;
1111 struct sockaddr *sap = (struct sockaddr *)&address;
1112 struct rpc_xprt *xprt;
1113 struct net *net;
1114 size_t salen;
1115 int err;
1116
1117 rcu_read_lock();
1118 xprt = rcu_dereference(clnt->cl_xprt);
1119 salen = xprt->addrlen;
1120 memcpy(sap, &xprt->addr, salen);
1121 net = get_net(xprt->xprt_net);
1122 rcu_read_unlock();
1123
1124 rpc_set_port(sap, 0);
1125 err = rpc_sockname(net, sap, salen, buf, buflen);
1126 put_net(net);
1127 if (err != 0)
1128 /* Couldn't discover local address, return ANYADDR */
1129 return rpc_anyaddr(sap->sa_family, buf, buflen);
1130 return 0;
1131 }
1132 EXPORT_SYMBOL_GPL(rpc_localaddr);
1133
1134 void
1135 rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize)
1136 {
1137 struct rpc_xprt *xprt;
1138
1139 rcu_read_lock();
1140 xprt = rcu_dereference(clnt->cl_xprt);
1141 if (xprt->ops->set_buffer_size)
1142 xprt->ops->set_buffer_size(xprt, sndsize, rcvsize);
1143 rcu_read_unlock();
1144 }
1145 EXPORT_SYMBOL_GPL(rpc_setbufsize);
1146
1147 /**
1148 * rpc_protocol - Get transport protocol number for an RPC client
1149 * @clnt: RPC client to query
1150 *
1151 */
1152 int rpc_protocol(struct rpc_clnt *clnt)
1153 {
1154 int protocol;
1155
1156 rcu_read_lock();
1157 protocol = rcu_dereference(clnt->cl_xprt)->prot;
1158 rcu_read_unlock();
1159 return protocol;
1160 }
1161 EXPORT_SYMBOL_GPL(rpc_protocol);
1162
1163 /**
1164 * rpc_net_ns - Get the network namespace for this RPC client
1165 * @clnt: RPC client to query
1166 *
1167 */
1168 struct net *rpc_net_ns(struct rpc_clnt *clnt)
1169 {
1170 struct net *ret;
1171
1172 rcu_read_lock();
1173 ret = rcu_dereference(clnt->cl_xprt)->xprt_net;
1174 rcu_read_unlock();
1175 return ret;
1176 }
1177 EXPORT_SYMBOL_GPL(rpc_net_ns);
1178
1179 /**
1180 * rpc_max_payload - Get maximum payload size for a transport, in bytes
1181 * @clnt: RPC client to query
1182 *
1183 * For stream transports, this is one RPC record fragment (see RFC
1184 * 1831), as we don't support multi-record requests yet. For datagram
1185 * transports, this is the size of an IP packet minus the IP, UDP, and
1186 * RPC header sizes.
1187 */
1188 size_t rpc_max_payload(struct rpc_clnt *clnt)
1189 {
1190 size_t ret;
1191
1192 rcu_read_lock();
1193 ret = rcu_dereference(clnt->cl_xprt)->max_payload;
1194 rcu_read_unlock();
1195 return ret;
1196 }
1197 EXPORT_SYMBOL_GPL(rpc_max_payload);
1198
1199 /**
1200 * rpc_get_timeout - Get timeout for transport in units of HZ
1201 * @clnt: RPC client to query
1202 */
1203 unsigned long rpc_get_timeout(struct rpc_clnt *clnt)
1204 {
1205 unsigned long ret;
1206
1207 rcu_read_lock();
1208 ret = rcu_dereference(clnt->cl_xprt)->timeout->to_initval;
1209 rcu_read_unlock();
1210 return ret;
1211 }
1212 EXPORT_SYMBOL_GPL(rpc_get_timeout);
1213
1214 /**
1215 * rpc_force_rebind - force transport to check that remote port is unchanged
1216 * @clnt: client to rebind
1217 *
1218 */
1219 void rpc_force_rebind(struct rpc_clnt *clnt)
1220 {
1221 if (clnt->cl_autobind) {
1222 rcu_read_lock();
1223 xprt_clear_bound(rcu_dereference(clnt->cl_xprt));
1224 rcu_read_unlock();
1225 }
1226 }
1227 EXPORT_SYMBOL_GPL(rpc_force_rebind);
1228
1229 /*
1230 * Restart an (async) RPC call from the call_prepare state.
1231 * Usually called from within the exit handler.
1232 */
1233 int
1234 rpc_restart_call_prepare(struct rpc_task *task)
1235 {
1236 if (RPC_ASSASSINATED(task))
1237 return 0;
1238 task->tk_action = call_start;
1239 if (task->tk_ops->rpc_call_prepare != NULL)
1240 task->tk_action = rpc_prepare_task;
1241 return 1;
1242 }
1243 EXPORT_SYMBOL_GPL(rpc_restart_call_prepare);
1244
1245 /*
1246 * Restart an (async) RPC call. Usually called from within the
1247 * exit handler.
1248 */
1249 int
1250 rpc_restart_call(struct rpc_task *task)
1251 {
1252 if (RPC_ASSASSINATED(task))
1253 return 0;
1254 task->tk_action = call_start;
1255 return 1;
1256 }
1257 EXPORT_SYMBOL_GPL(rpc_restart_call);
1258
1259 #ifdef RPC_DEBUG
1260 static const char *rpc_proc_name(const struct rpc_task *task)
1261 {
1262 const struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
1263
1264 if (proc) {
1265 if (proc->p_name)
1266 return proc->p_name;
1267 else
1268 return "NULL";
1269 } else
1270 return "no proc";
1271 }
1272 #endif
1273
1274 /*
1275 * 0. Initial state
1276 *
1277 * Other FSM states can be visited zero or more times, but
1278 * this state is visited exactly once for each RPC.
1279 */
1280 static void
1281 call_start(struct rpc_task *task)
1282 {
1283 struct rpc_clnt *clnt = task->tk_client;
1284
1285 dprintk("RPC: %5u call_start %s%d proc %s (%s)\n", task->tk_pid,
1286 clnt->cl_protname, clnt->cl_vers,
1287 rpc_proc_name(task),
1288 (RPC_IS_ASYNC(task) ? "async" : "sync"));
1289
1290 /* Increment call count */
1291 task->tk_msg.rpc_proc->p_count++;
1292 clnt->cl_stats->rpccnt++;
1293 task->tk_action = call_reserve;
1294 }
1295
1296 /*
1297 * 1. Reserve an RPC call slot
1298 */
1299 static void
1300 call_reserve(struct rpc_task *task)
1301 {
1302 dprint_status(task);
1303
1304 task->tk_status = 0;
1305 task->tk_action = call_reserveresult;
1306 xprt_reserve(task);
1307 }
1308
1309 /*
1310 * 1b. Grok the result of xprt_reserve()
1311 */
1312 static void
1313 call_reserveresult(struct rpc_task *task)
1314 {
1315 int status = task->tk_status;
1316
1317 dprint_status(task);
1318
1319 /*
1320 * After a call to xprt_reserve(), we must have either
1321 * a request slot or else an error status.
1322 */
1323 task->tk_status = 0;
1324 if (status >= 0) {
1325 if (task->tk_rqstp) {
1326 task->tk_action = call_refresh;
1327 return;
1328 }
1329
1330 printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n",
1331 __func__, status);
1332 rpc_exit(task, -EIO);
1333 return;
1334 }
1335
1336 /*
1337 * Even though there was an error, we may have acquired
1338 * a request slot somehow. Make sure not to leak it.
1339 */
1340 if (task->tk_rqstp) {
1341 printk(KERN_ERR "%s: status=%d, request allocated anyway\n",
1342 __func__, status);
1343 xprt_release(task);
1344 }
1345
1346 switch (status) {
1347 case -ENOMEM:
1348 rpc_delay(task, HZ >> 2);
1349 case -EAGAIN: /* woken up; retry */
1350 task->tk_action = call_reserve;
1351 return;
1352 case -EIO: /* probably a shutdown */
1353 break;
1354 default:
1355 printk(KERN_ERR "%s: unrecognized error %d, exiting\n",
1356 __func__, status);
1357 break;
1358 }
1359 rpc_exit(task, status);
1360 }
1361
1362 /*
1363 * 2. Bind and/or refresh the credentials
1364 */
1365 static void
1366 call_refresh(struct rpc_task *task)
1367 {
1368 dprint_status(task);
1369
1370 task->tk_action = call_refreshresult;
1371 task->tk_status = 0;
1372 task->tk_client->cl_stats->rpcauthrefresh++;
1373 rpcauth_refreshcred(task);
1374 }
1375
1376 /*
1377 * 2a. Process the results of a credential refresh
1378 */
1379 static void
1380 call_refreshresult(struct rpc_task *task)
1381 {
1382 int status = task->tk_status;
1383
1384 dprint_status(task);
1385
1386 task->tk_status = 0;
1387 task->tk_action = call_refresh;
1388 switch (status) {
1389 case 0:
1390 if (rpcauth_uptodatecred(task))
1391 task->tk_action = call_allocate;
1392 return;
1393 case -ETIMEDOUT:
1394 rpc_delay(task, 3*HZ);
1395 case -EKEYEXPIRED:
1396 case -EAGAIN:
1397 status = -EACCES;
1398 if (!task->tk_cred_retry)
1399 break;
1400 task->tk_cred_retry--;
1401 dprintk("RPC: %5u %s: retry refresh creds\n",
1402 task->tk_pid, __func__);
1403 return;
1404 }
1405 dprintk("RPC: %5u %s: refresh creds failed with error %d\n",
1406 task->tk_pid, __func__, status);
1407 rpc_exit(task, status);
1408 }
1409
1410 /*
1411 * 2b. Allocate the buffer. For details, see sched.c:rpc_malloc.
1412 * (Note: buffer memory is freed in xprt_release).
1413 */
1414 static void
1415 call_allocate(struct rpc_task *task)
1416 {
1417 unsigned int slack = task->tk_rqstp->rq_cred->cr_auth->au_cslack;
1418 struct rpc_rqst *req = task->tk_rqstp;
1419 struct rpc_xprt *xprt = req->rq_xprt;
1420 struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
1421
1422 dprint_status(task);
1423
1424 task->tk_status = 0;
1425 task->tk_action = call_bind;
1426
1427 if (req->rq_buffer)
1428 return;
1429
1430 if (proc->p_proc != 0) {
1431 BUG_ON(proc->p_arglen == 0);
1432 if (proc->p_decode != NULL)
1433 BUG_ON(proc->p_replen == 0);
1434 }
1435
1436 /*
1437 * Calculate the size (in quads) of the RPC call
1438 * and reply headers, and convert both values
1439 * to byte sizes.
1440 */
1441 req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen;
1442 req->rq_callsize <<= 2;
1443 req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen;
1444 req->rq_rcvsize <<= 2;
1445
1446 req->rq_buffer = xprt->ops->buf_alloc(task,
1447 req->rq_callsize + req->rq_rcvsize);
1448 if (req->rq_buffer != NULL)
1449 return;
1450
1451 dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid);
1452
1453 if (RPC_IS_ASYNC(task) || !fatal_signal_pending(current)) {
1454 task->tk_action = call_allocate;
1455 rpc_delay(task, HZ>>4);
1456 return;
1457 }
1458
1459 rpc_exit(task, -ERESTARTSYS);
1460 }
1461
1462 static inline int
1463 rpc_task_need_encode(struct rpc_task *task)
1464 {
1465 return task->tk_rqstp->rq_snd_buf.len == 0;
1466 }
1467
1468 static inline void
1469 rpc_task_force_reencode(struct rpc_task *task)
1470 {
1471 task->tk_rqstp->rq_snd_buf.len = 0;
1472 task->tk_rqstp->rq_bytes_sent = 0;
1473 }
1474
1475 static inline void
1476 rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len)
1477 {
1478 buf->head[0].iov_base = start;
1479 buf->head[0].iov_len = len;
1480 buf->tail[0].iov_len = 0;
1481 buf->page_len = 0;
1482 buf->flags = 0;
1483 buf->len = 0;
1484 buf->buflen = len;
1485 }
1486
1487 /*
1488 * 3. Encode arguments of an RPC call
1489 */
1490 static void
1491 rpc_xdr_encode(struct rpc_task *task)
1492 {
1493 struct rpc_rqst *req = task->tk_rqstp;
1494 kxdreproc_t encode;
1495 __be32 *p;
1496
1497 dprint_status(task);
1498
1499 rpc_xdr_buf_init(&req->rq_snd_buf,
1500 req->rq_buffer,
1501 req->rq_callsize);
1502 rpc_xdr_buf_init(&req->rq_rcv_buf,
1503 (char *)req->rq_buffer + req->rq_callsize,
1504 req->rq_rcvsize);
1505
1506 p = rpc_encode_header(task);
1507 if (p == NULL) {
1508 printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n");
1509 rpc_exit(task, -EIO);
1510 return;
1511 }
1512
1513 encode = task->tk_msg.rpc_proc->p_encode;
1514 if (encode == NULL)
1515 return;
1516
1517 task->tk_status = rpcauth_wrap_req(task, encode, req, p,
1518 task->tk_msg.rpc_argp);
1519 }
1520
1521 /*
1522 * 4. Get the server port number if not yet set
1523 */
1524 static void
1525 call_bind(struct rpc_task *task)
1526 {
1527 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
1528
1529 dprint_status(task);
1530
1531 task->tk_action = call_connect;
1532 if (!xprt_bound(xprt)) {
1533 task->tk_action = call_bind_status;
1534 task->tk_timeout = xprt->bind_timeout;
1535 xprt->ops->rpcbind(task);
1536 }
1537 }
1538
1539 /*
1540 * 4a. Sort out bind result
1541 */
1542 static void
1543 call_bind_status(struct rpc_task *task)
1544 {
1545 int status = -EIO;
1546
1547 if (task->tk_status >= 0) {
1548 dprint_status(task);
1549 task->tk_status = 0;
1550 task->tk_action = call_connect;
1551 return;
1552 }
1553
1554 trace_rpc_bind_status(task);
1555 switch (task->tk_status) {
1556 case -ENOMEM:
1557 dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid);
1558 rpc_delay(task, HZ >> 2);
1559 goto retry_timeout;
1560 case -EACCES:
1561 dprintk("RPC: %5u remote rpcbind: RPC program/version "
1562 "unavailable\n", task->tk_pid);
1563 /* fail immediately if this is an RPC ping */
1564 if (task->tk_msg.rpc_proc->p_proc == 0) {
1565 status = -EOPNOTSUPP;
1566 break;
1567 }
1568 if (task->tk_rebind_retry == 0)
1569 break;
1570 task->tk_rebind_retry--;
1571 rpc_delay(task, 3*HZ);
1572 goto retry_timeout;
1573 case -ETIMEDOUT:
1574 dprintk("RPC: %5u rpcbind request timed out\n",
1575 task->tk_pid);
1576 goto retry_timeout;
1577 case -EPFNOSUPPORT:
1578 /* server doesn't support any rpcbind version we know of */
1579 dprintk("RPC: %5u unrecognized remote rpcbind service\n",
1580 task->tk_pid);
1581 break;
1582 case -EPROTONOSUPPORT:
1583 dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n",
1584 task->tk_pid);
1585 task->tk_status = 0;
1586 task->tk_action = call_bind;
1587 return;
1588 case -ECONNREFUSED: /* connection problems */
1589 case -ECONNRESET:
1590 case -ENOTCONN:
1591 case -EHOSTDOWN:
1592 case -EHOSTUNREACH:
1593 case -ENETUNREACH:
1594 case -EPIPE:
1595 dprintk("RPC: %5u remote rpcbind unreachable: %d\n",
1596 task->tk_pid, task->tk_status);
1597 if (!RPC_IS_SOFTCONN(task)) {
1598 rpc_delay(task, 5*HZ);
1599 goto retry_timeout;
1600 }
1601 status = task->tk_status;
1602 break;
1603 default:
1604 dprintk("RPC: %5u unrecognized rpcbind error (%d)\n",
1605 task->tk_pid, -task->tk_status);
1606 }
1607
1608 rpc_exit(task, status);
1609 return;
1610
1611 retry_timeout:
1612 task->tk_action = call_timeout;
1613 }
1614
1615 /*
1616 * 4b. Connect to the RPC server
1617 */
1618 static void
1619 call_connect(struct rpc_task *task)
1620 {
1621 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
1622
1623 dprintk("RPC: %5u call_connect xprt %p %s connected\n",
1624 task->tk_pid, xprt,
1625 (xprt_connected(xprt) ? "is" : "is not"));
1626
1627 task->tk_action = call_transmit;
1628 if (!xprt_connected(xprt)) {
1629 task->tk_action = call_connect_status;
1630 if (task->tk_status < 0)
1631 return;
1632 xprt_connect(task);
1633 }
1634 }
1635
1636 /*
1637 * 4c. Sort out connect result
1638 */
1639 static void
1640 call_connect_status(struct rpc_task *task)
1641 {
1642 struct rpc_clnt *clnt = task->tk_client;
1643 int status = task->tk_status;
1644
1645 dprint_status(task);
1646
1647 task->tk_status = 0;
1648 if (status >= 0 || status == -EAGAIN) {
1649 clnt->cl_stats->netreconn++;
1650 task->tk_action = call_transmit;
1651 return;
1652 }
1653
1654 trace_rpc_connect_status(task, status);
1655 switch (status) {
1656 /* if soft mounted, test if we've timed out */
1657 case -ETIMEDOUT:
1658 task->tk_action = call_timeout;
1659 break;
1660 default:
1661 rpc_exit(task, -EIO);
1662 }
1663 }
1664
1665 /*
1666 * 5. Transmit the RPC request, and wait for reply
1667 */
1668 static void
1669 call_transmit(struct rpc_task *task)
1670 {
1671 dprint_status(task);
1672
1673 task->tk_action = call_status;
1674 if (task->tk_status < 0)
1675 return;
1676 task->tk_status = xprt_prepare_transmit(task);
1677 if (task->tk_status != 0)
1678 return;
1679 task->tk_action = call_transmit_status;
1680 /* Encode here so that rpcsec_gss can use correct sequence number. */
1681 if (rpc_task_need_encode(task)) {
1682 rpc_xdr_encode(task);
1683 /* Did the encode result in an error condition? */
1684 if (task->tk_status != 0) {
1685 /* Was the error nonfatal? */
1686 if (task->tk_status == -EAGAIN)
1687 rpc_delay(task, HZ >> 4);
1688 else
1689 rpc_exit(task, task->tk_status);
1690 return;
1691 }
1692 }
1693 xprt_transmit(task);
1694 if (task->tk_status < 0)
1695 return;
1696 /*
1697 * On success, ensure that we call xprt_end_transmit() before sleeping
1698 * in order to allow access to the socket to other RPC requests.
1699 */
1700 call_transmit_status(task);
1701 if (rpc_reply_expected(task))
1702 return;
1703 task->tk_action = rpc_exit_task;
1704 rpc_wake_up_queued_task(&task->tk_rqstp->rq_xprt->pending, task);
1705 }
1706
1707 /*
1708 * 5a. Handle cleanup after a transmission
1709 */
1710 static void
1711 call_transmit_status(struct rpc_task *task)
1712 {
1713 task->tk_action = call_status;
1714
1715 /*
1716 * Common case: success. Force the compiler to put this
1717 * test first.
1718 */
1719 if (task->tk_status == 0) {
1720 xprt_end_transmit(task);
1721 rpc_task_force_reencode(task);
1722 return;
1723 }
1724
1725 switch (task->tk_status) {
1726 case -EAGAIN:
1727 break;
1728 default:
1729 dprint_status(task);
1730 xprt_end_transmit(task);
1731 rpc_task_force_reencode(task);
1732 break;
1733 /*
1734 * Special cases: if we've been waiting on the
1735 * socket's write_space() callback, or if the
1736 * socket just returned a connection error,
1737 * then hold onto the transport lock.
1738 */
1739 case -ECONNREFUSED:
1740 case -EHOSTDOWN:
1741 case -EHOSTUNREACH:
1742 case -ENETUNREACH:
1743 if (RPC_IS_SOFTCONN(task)) {
1744 xprt_end_transmit(task);
1745 rpc_exit(task, task->tk_status);
1746 break;
1747 }
1748 case -ECONNRESET:
1749 case -ENOTCONN:
1750 case -EPIPE:
1751 rpc_task_force_reencode(task);
1752 }
1753 }
1754
1755 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1756 /*
1757 * 5b. Send the backchannel RPC reply. On error, drop the reply. In
1758 * addition, disconnect on connectivity errors.
1759 */
1760 static void
1761 call_bc_transmit(struct rpc_task *task)
1762 {
1763 struct rpc_rqst *req = task->tk_rqstp;
1764
1765 task->tk_status = xprt_prepare_transmit(task);
1766 if (task->tk_status == -EAGAIN) {
1767 /*
1768 * Could not reserve the transport. Try again after the
1769 * transport is released.
1770 */
1771 task->tk_status = 0;
1772 task->tk_action = call_bc_transmit;
1773 return;
1774 }
1775
1776 task->tk_action = rpc_exit_task;
1777 if (task->tk_status < 0) {
1778 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
1779 "error: %d\n", task->tk_status);
1780 return;
1781 }
1782
1783 xprt_transmit(task);
1784 xprt_end_transmit(task);
1785 dprint_status(task);
1786 switch (task->tk_status) {
1787 case 0:
1788 /* Success */
1789 break;
1790 case -EHOSTDOWN:
1791 case -EHOSTUNREACH:
1792 case -ENETUNREACH:
1793 case -ETIMEDOUT:
1794 /*
1795 * Problem reaching the server. Disconnect and let the
1796 * forechannel reestablish the connection. The server will
1797 * have to retransmit the backchannel request and we'll
1798 * reprocess it. Since these ops are idempotent, there's no
1799 * need to cache our reply at this time.
1800 */
1801 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
1802 "error: %d\n", task->tk_status);
1803 xprt_conditional_disconnect(req->rq_xprt,
1804 req->rq_connect_cookie);
1805 break;
1806 default:
1807 /*
1808 * We were unable to reply and will have to drop the
1809 * request. The server should reconnect and retransmit.
1810 */
1811 WARN_ON_ONCE(task->tk_status == -EAGAIN);
1812 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
1813 "error: %d\n", task->tk_status);
1814 break;
1815 }
1816 rpc_wake_up_queued_task(&req->rq_xprt->pending, task);
1817 }
1818 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1819
1820 /*
1821 * 6. Sort out the RPC call status
1822 */
1823 static void
1824 call_status(struct rpc_task *task)
1825 {
1826 struct rpc_clnt *clnt = task->tk_client;
1827 struct rpc_rqst *req = task->tk_rqstp;
1828 int status;
1829
1830 if (req->rq_reply_bytes_recvd > 0 && !req->rq_bytes_sent)
1831 task->tk_status = req->rq_reply_bytes_recvd;
1832
1833 dprint_status(task);
1834
1835 status = task->tk_status;
1836 if (status >= 0) {
1837 task->tk_action = call_decode;
1838 return;
1839 }
1840
1841 trace_rpc_call_status(task);
1842 task->tk_status = 0;
1843 switch(status) {
1844 case -EHOSTDOWN:
1845 case -EHOSTUNREACH:
1846 case -ENETUNREACH:
1847 /*
1848 * Delay any retries for 3 seconds, then handle as if it
1849 * were a timeout.
1850 */
1851 rpc_delay(task, 3*HZ);
1852 case -ETIMEDOUT:
1853 task->tk_action = call_timeout;
1854 if (task->tk_client->cl_discrtry)
1855 xprt_conditional_disconnect(req->rq_xprt,
1856 req->rq_connect_cookie);
1857 break;
1858 case -ECONNRESET:
1859 case -ECONNREFUSED:
1860 rpc_force_rebind(clnt);
1861 rpc_delay(task, 3*HZ);
1862 case -EPIPE:
1863 case -ENOTCONN:
1864 task->tk_action = call_bind;
1865 break;
1866 case -EAGAIN:
1867 task->tk_action = call_transmit;
1868 break;
1869 case -EIO:
1870 /* shutdown or soft timeout */
1871 rpc_exit(task, status);
1872 break;
1873 default:
1874 if (clnt->cl_chatty)
1875 printk("%s: RPC call returned error %d\n",
1876 clnt->cl_protname, -status);
1877 rpc_exit(task, status);
1878 }
1879 }
1880
1881 /*
1882 * 6a. Handle RPC timeout
1883 * We do not release the request slot, so we keep using the
1884 * same XID for all retransmits.
1885 */
1886 static void
1887 call_timeout(struct rpc_task *task)
1888 {
1889 struct rpc_clnt *clnt = task->tk_client;
1890
1891 if (xprt_adjust_timeout(task->tk_rqstp) == 0) {
1892 dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid);
1893 goto retry;
1894 }
1895
1896 dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid);
1897 task->tk_timeouts++;
1898
1899 if (RPC_IS_SOFTCONN(task)) {
1900 rpc_exit(task, -ETIMEDOUT);
1901 return;
1902 }
1903 if (RPC_IS_SOFT(task)) {
1904 if (clnt->cl_chatty) {
1905 rcu_read_lock();
1906 printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
1907 clnt->cl_protname,
1908 rcu_dereference(clnt->cl_xprt)->servername);
1909 rcu_read_unlock();
1910 }
1911 if (task->tk_flags & RPC_TASK_TIMEOUT)
1912 rpc_exit(task, -ETIMEDOUT);
1913 else
1914 rpc_exit(task, -EIO);
1915 return;
1916 }
1917
1918 if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) {
1919 task->tk_flags |= RPC_CALL_MAJORSEEN;
1920 if (clnt->cl_chatty) {
1921 rcu_read_lock();
1922 printk(KERN_NOTICE "%s: server %s not responding, still trying\n",
1923 clnt->cl_protname,
1924 rcu_dereference(clnt->cl_xprt)->servername);
1925 rcu_read_unlock();
1926 }
1927 }
1928 rpc_force_rebind(clnt);
1929 /*
1930 * Did our request time out due to an RPCSEC_GSS out-of-sequence
1931 * event? RFC2203 requires the server to drop all such requests.
1932 */
1933 rpcauth_invalcred(task);
1934
1935 retry:
1936 clnt->cl_stats->rpcretrans++;
1937 task->tk_action = call_bind;
1938 task->tk_status = 0;
1939 }
1940
1941 /*
1942 * 7. Decode the RPC reply
1943 */
1944 static void
1945 call_decode(struct rpc_task *task)
1946 {
1947 struct rpc_clnt *clnt = task->tk_client;
1948 struct rpc_rqst *req = task->tk_rqstp;
1949 kxdrdproc_t decode = task->tk_msg.rpc_proc->p_decode;
1950 __be32 *p;
1951
1952 dprint_status(task);
1953
1954 if (task->tk_flags & RPC_CALL_MAJORSEEN) {
1955 if (clnt->cl_chatty) {
1956 rcu_read_lock();
1957 printk(KERN_NOTICE "%s: server %s OK\n",
1958 clnt->cl_protname,
1959 rcu_dereference(clnt->cl_xprt)->servername);
1960 rcu_read_unlock();
1961 }
1962 task->tk_flags &= ~RPC_CALL_MAJORSEEN;
1963 }
1964
1965 /*
1966 * Ensure that we see all writes made by xprt_complete_rqst()
1967 * before it changed req->rq_reply_bytes_recvd.
1968 */
1969 smp_rmb();
1970 req->rq_rcv_buf.len = req->rq_private_buf.len;
1971
1972 /* Check that the softirq receive buffer is valid */
1973 WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf,
1974 sizeof(req->rq_rcv_buf)) != 0);
1975
1976 if (req->rq_rcv_buf.len < 12) {
1977 if (!RPC_IS_SOFT(task)) {
1978 task->tk_action = call_bind;
1979 clnt->cl_stats->rpcretrans++;
1980 goto out_retry;
1981 }
1982 dprintk("RPC: %s: too small RPC reply size (%d bytes)\n",
1983 clnt->cl_protname, task->tk_status);
1984 task->tk_action = call_timeout;
1985 goto out_retry;
1986 }
1987
1988 p = rpc_verify_header(task);
1989 if (IS_ERR(p)) {
1990 if (p == ERR_PTR(-EAGAIN))
1991 goto out_retry;
1992 return;
1993 }
1994
1995 task->tk_action = rpc_exit_task;
1996
1997 if (decode) {
1998 task->tk_status = rpcauth_unwrap_resp(task, decode, req, p,
1999 task->tk_msg.rpc_resp);
2000 }
2001 dprintk("RPC: %5u call_decode result %d\n", task->tk_pid,
2002 task->tk_status);
2003 return;
2004 out_retry:
2005 task->tk_status = 0;
2006 /* Note: rpc_verify_header() may have freed the RPC slot */
2007 if (task->tk_rqstp == req) {
2008 req->rq_reply_bytes_recvd = req->rq_rcv_buf.len = 0;
2009 if (task->tk_client->cl_discrtry)
2010 xprt_conditional_disconnect(req->rq_xprt,
2011 req->rq_connect_cookie);
2012 }
2013 }
2014
2015 static __be32 *
2016 rpc_encode_header(struct rpc_task *task)
2017 {
2018 struct rpc_clnt *clnt = task->tk_client;
2019 struct rpc_rqst *req = task->tk_rqstp;
2020 __be32 *p = req->rq_svec[0].iov_base;
2021
2022 /* FIXME: check buffer size? */
2023
2024 p = xprt_skip_transport_header(req->rq_xprt, p);
2025 *p++ = req->rq_xid; /* XID */
2026 *p++ = htonl(RPC_CALL); /* CALL */
2027 *p++ = htonl(RPC_VERSION); /* RPC version */
2028 *p++ = htonl(clnt->cl_prog); /* program number */
2029 *p++ = htonl(clnt->cl_vers); /* program version */
2030 *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */
2031 p = rpcauth_marshcred(task, p);
2032 req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p);
2033 return p;
2034 }
2035
2036 static __be32 *
2037 rpc_verify_header(struct rpc_task *task)
2038 {
2039 struct rpc_clnt *clnt = task->tk_client;
2040 struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0];
2041 int len = task->tk_rqstp->rq_rcv_buf.len >> 2;
2042 __be32 *p = iov->iov_base;
2043 u32 n;
2044 int error = -EACCES;
2045
2046 if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) {
2047 /* RFC-1014 says that the representation of XDR data must be a
2048 * multiple of four bytes
2049 * - if it isn't pointer subtraction in the NFS client may give
2050 * undefined results
2051 */
2052 dprintk("RPC: %5u %s: XDR representation not a multiple of"
2053 " 4 bytes: 0x%x\n", task->tk_pid, __func__,
2054 task->tk_rqstp->rq_rcv_buf.len);
2055 goto out_eio;
2056 }
2057 if ((len -= 3) < 0)
2058 goto out_overflow;
2059
2060 p += 1; /* skip XID */
2061 if ((n = ntohl(*p++)) != RPC_REPLY) {
2062 dprintk("RPC: %5u %s: not an RPC reply: %x\n",
2063 task->tk_pid, __func__, n);
2064 goto out_garbage;
2065 }
2066
2067 if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) {
2068 if (--len < 0)
2069 goto out_overflow;
2070 switch ((n = ntohl(*p++))) {
2071 case RPC_AUTH_ERROR:
2072 break;
2073 case RPC_MISMATCH:
2074 dprintk("RPC: %5u %s: RPC call version mismatch!\n",
2075 task->tk_pid, __func__);
2076 error = -EPROTONOSUPPORT;
2077 goto out_err;
2078 default:
2079 dprintk("RPC: %5u %s: RPC call rejected, "
2080 "unknown error: %x\n",
2081 task->tk_pid, __func__, n);
2082 goto out_eio;
2083 }
2084 if (--len < 0)
2085 goto out_overflow;
2086 switch ((n = ntohl(*p++))) {
2087 case RPC_AUTH_REJECTEDCRED:
2088 case RPC_AUTH_REJECTEDVERF:
2089 case RPCSEC_GSS_CREDPROBLEM:
2090 case RPCSEC_GSS_CTXPROBLEM:
2091 if (!task->tk_cred_retry)
2092 break;
2093 task->tk_cred_retry--;
2094 dprintk("RPC: %5u %s: retry stale creds\n",
2095 task->tk_pid, __func__);
2096 rpcauth_invalcred(task);
2097 /* Ensure we obtain a new XID! */
2098 xprt_release(task);
2099 task->tk_action = call_reserve;
2100 goto out_retry;
2101 case RPC_AUTH_BADCRED:
2102 case RPC_AUTH_BADVERF:
2103 /* possibly garbled cred/verf? */
2104 if (!task->tk_garb_retry)
2105 break;
2106 task->tk_garb_retry--;
2107 dprintk("RPC: %5u %s: retry garbled creds\n",
2108 task->tk_pid, __func__);
2109 task->tk_action = call_bind;
2110 goto out_retry;
2111 case RPC_AUTH_TOOWEAK:
2112 rcu_read_lock();
2113 printk(KERN_NOTICE "RPC: server %s requires stronger "
2114 "authentication.\n",
2115 rcu_dereference(clnt->cl_xprt)->servername);
2116 rcu_read_unlock();
2117 break;
2118 default:
2119 dprintk("RPC: %5u %s: unknown auth error: %x\n",
2120 task->tk_pid, __func__, n);
2121 error = -EIO;
2122 }
2123 dprintk("RPC: %5u %s: call rejected %d\n",
2124 task->tk_pid, __func__, n);
2125 goto out_err;
2126 }
2127 if (!(p = rpcauth_checkverf(task, p))) {
2128 dprintk("RPC: %5u %s: auth check failed\n",
2129 task->tk_pid, __func__);
2130 goto out_garbage; /* bad verifier, retry */
2131 }
2132 len = p - (__be32 *)iov->iov_base - 1;
2133 if (len < 0)
2134 goto out_overflow;
2135 switch ((n = ntohl(*p++))) {
2136 case RPC_SUCCESS:
2137 return p;
2138 case RPC_PROG_UNAVAIL:
2139 dprintk_rcu("RPC: %5u %s: program %u is unsupported "
2140 "by server %s\n", task->tk_pid, __func__,
2141 (unsigned int)clnt->cl_prog,
2142 rcu_dereference(clnt->cl_xprt)->servername);
2143 error = -EPFNOSUPPORT;
2144 goto out_err;
2145 case RPC_PROG_MISMATCH:
2146 dprintk_rcu("RPC: %5u %s: program %u, version %u unsupported "
2147 "by server %s\n", task->tk_pid, __func__,
2148 (unsigned int)clnt->cl_prog,
2149 (unsigned int)clnt->cl_vers,
2150 rcu_dereference(clnt->cl_xprt)->servername);
2151 error = -EPROTONOSUPPORT;
2152 goto out_err;
2153 case RPC_PROC_UNAVAIL:
2154 dprintk_rcu("RPC: %5u %s: proc %s unsupported by program %u, "
2155 "version %u on server %s\n",
2156 task->tk_pid, __func__,
2157 rpc_proc_name(task),
2158 clnt->cl_prog, clnt->cl_vers,
2159 rcu_dereference(clnt->cl_xprt)->servername);
2160 error = -EOPNOTSUPP;
2161 goto out_err;
2162 case RPC_GARBAGE_ARGS:
2163 dprintk("RPC: %5u %s: server saw garbage\n",
2164 task->tk_pid, __func__);
2165 break; /* retry */
2166 default:
2167 dprintk("RPC: %5u %s: server accept status: %x\n",
2168 task->tk_pid, __func__, n);
2169 /* Also retry */
2170 }
2171
2172 out_garbage:
2173 clnt->cl_stats->rpcgarbage++;
2174 if (task->tk_garb_retry) {
2175 task->tk_garb_retry--;
2176 dprintk("RPC: %5u %s: retrying\n",
2177 task->tk_pid, __func__);
2178 task->tk_action = call_bind;
2179 out_retry:
2180 return ERR_PTR(-EAGAIN);
2181 }
2182 out_eio:
2183 error = -EIO;
2184 out_err:
2185 rpc_exit(task, error);
2186 dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid,
2187 __func__, error);
2188 return ERR_PTR(error);
2189 out_overflow:
2190 dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid,
2191 __func__);
2192 goto out_garbage;
2193 }
2194
2195 static void rpcproc_encode_null(void *rqstp, struct xdr_stream *xdr, void *obj)
2196 {
2197 }
2198
2199 static int rpcproc_decode_null(void *rqstp, struct xdr_stream *xdr, void *obj)
2200 {
2201 return 0;
2202 }
2203
2204 static struct rpc_procinfo rpcproc_null = {
2205 .p_encode = rpcproc_encode_null,
2206 .p_decode = rpcproc_decode_null,
2207 };
2208
2209 static int rpc_ping(struct rpc_clnt *clnt)
2210 {
2211 struct rpc_message msg = {
2212 .rpc_proc = &rpcproc_null,
2213 };
2214 int err;
2215 msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0);
2216 err = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN);
2217 put_rpccred(msg.rpc_cred);
2218 return err;
2219 }
2220
2221 struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags)
2222 {
2223 struct rpc_message msg = {
2224 .rpc_proc = &rpcproc_null,
2225 .rpc_cred = cred,
2226 };
2227 struct rpc_task_setup task_setup_data = {
2228 .rpc_client = clnt,
2229 .rpc_message = &msg,
2230 .callback_ops = &rpc_default_ops,
2231 .flags = flags,
2232 };
2233 return rpc_run_task(&task_setup_data);
2234 }
2235 EXPORT_SYMBOL_GPL(rpc_call_null);
2236
2237 #ifdef RPC_DEBUG
2238 static void rpc_show_header(void)
2239 {
2240 printk(KERN_INFO "-pid- flgs status -client- --rqstp- "
2241 "-timeout ---ops--\n");
2242 }
2243
2244 static void rpc_show_task(const struct rpc_clnt *clnt,
2245 const struct rpc_task *task)
2246 {
2247 const char *rpc_waitq = "none";
2248
2249 if (RPC_IS_QUEUED(task))
2250 rpc_waitq = rpc_qname(task->tk_waitqueue);
2251
2252 printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%ps q:%s\n",
2253 task->tk_pid, task->tk_flags, task->tk_status,
2254 clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops,
2255 clnt->cl_protname, clnt->cl_vers, rpc_proc_name(task),
2256 task->tk_action, rpc_waitq);
2257 }
2258
2259 void rpc_show_tasks(struct net *net)
2260 {
2261 struct rpc_clnt *clnt;
2262 struct rpc_task *task;
2263 int header = 0;
2264 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
2265
2266 spin_lock(&sn->rpc_client_lock);
2267 list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
2268 spin_lock(&clnt->cl_lock);
2269 list_for_each_entry(task, &clnt->cl_tasks, tk_task) {
2270 if (!header) {
2271 rpc_show_header();
2272 header++;
2273 }
2274 rpc_show_task(clnt, task);
2275 }
2276 spin_unlock(&clnt->cl_lock);
2277 }
2278 spin_unlock(&sn->rpc_client_lock);
2279 }
2280 #endif
CJK support for tty framebuffer vt