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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[linux/fpc-iii.git] / net / sunrpc / clnt.c
blob9963584605c06e06992fc1d4d1c0a608b360a74b
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 dentry *dir, *dentry;
132
133 dir = rpc_d_lookup_sb(sb, dir_name);
134 if (dir == NULL) {
135 pr_info("RPC: pipefs directory doesn't exist: %s\n", dir_name);
136 return dir;
137 }
138 for (;;) {
139 snprintf(name, sizeof(name), "clnt%x", (unsigned int)clntid++);
140 name[sizeof(name) - 1] = '\0';
141 dentry = rpc_create_client_dir(dir, name, clnt);
142 if (!IS_ERR(dentry))
143 break;
144 if (dentry == ERR_PTR(-EEXIST))
145 continue;
146 printk(KERN_INFO "RPC: Couldn't create pipefs entry"
147 " %s/%s, error %ld\n",
148 dir_name, name, PTR_ERR(dentry));
149 break;
150 }
151 dput(dir);
152 return dentry;
153 }
154
155 static int
156 rpc_setup_pipedir(struct rpc_clnt *clnt, const char *dir_name,
157 struct super_block *pipefs_sb)
158 {
159 struct dentry *dentry;
160
161 clnt->cl_dentry = NULL;
162 if (dir_name == NULL)
163 return 0;
164 dentry = rpc_setup_pipedir_sb(pipefs_sb, clnt, dir_name);
165 if (IS_ERR(dentry))
166 return PTR_ERR(dentry);
167 clnt->cl_dentry = dentry;
168 return 0;
169 }
170
171 static inline int rpc_clnt_skip_event(struct rpc_clnt *clnt, unsigned long event)
172 {
173 if (((event == RPC_PIPEFS_MOUNT) && clnt->cl_dentry) ||
174 ((event == RPC_PIPEFS_UMOUNT) && !clnt->cl_dentry))
175 return 1;
176 if ((event == RPC_PIPEFS_MOUNT) && atomic_read(&clnt->cl_count) == 0)
177 return 1;
178 return 0;
179 }
180
181 static int __rpc_clnt_handle_event(struct rpc_clnt *clnt, unsigned long event,
182 struct super_block *sb)
183 {
184 struct dentry *dentry;
185 int err = 0;
186
187 switch (event) {
188 case RPC_PIPEFS_MOUNT:
189 dentry = rpc_setup_pipedir_sb(sb, clnt,
190 clnt->cl_program->pipe_dir_name);
191 if (!dentry)
192 return -ENOENT;
193 if (IS_ERR(dentry))
194 return PTR_ERR(dentry);
195 clnt->cl_dentry = dentry;
196 if (clnt->cl_auth->au_ops->pipes_create) {
197 err = clnt->cl_auth->au_ops->pipes_create(clnt->cl_auth);
198 if (err)
199 __rpc_clnt_remove_pipedir(clnt);
200 }
201 break;
202 case RPC_PIPEFS_UMOUNT:
203 __rpc_clnt_remove_pipedir(clnt);
204 break;
205 default:
206 printk(KERN_ERR "%s: unknown event: %ld\n", __func__, event);
207 return -ENOTSUPP;
208 }
209 return err;
210 }
211
212 static int __rpc_pipefs_event(struct rpc_clnt *clnt, unsigned long event,
213 struct super_block *sb)
214 {
215 int error = 0;
216
217 for (;; clnt = clnt->cl_parent) {
218 if (!rpc_clnt_skip_event(clnt, event))
219 error = __rpc_clnt_handle_event(clnt, event, sb);
220 if (error || clnt == clnt->cl_parent)
221 break;
222 }
223 return error;
224 }
225
226 static struct rpc_clnt *rpc_get_client_for_event(struct net *net, int event)
227 {
228 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
229 struct rpc_clnt *clnt;
230
231 spin_lock(&sn->rpc_client_lock);
232 list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
233 if (clnt->cl_program->pipe_dir_name == NULL)
234 continue;
235 if (rpc_clnt_skip_event(clnt, event))
236 continue;
237 spin_unlock(&sn->rpc_client_lock);
238 return clnt;
239 }
240 spin_unlock(&sn->rpc_client_lock);
241 return NULL;
242 }
243
244 static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
245 void *ptr)
246 {
247 struct super_block *sb = ptr;
248 struct rpc_clnt *clnt;
249 int error = 0;
250
251 while ((clnt = rpc_get_client_for_event(sb->s_fs_info, event))) {
252 error = __rpc_pipefs_event(clnt, event, sb);
253 if (error)
254 break;
255 }
256 return error;
257 }
258
259 static struct notifier_block rpc_clients_block = {
260 .notifier_call = rpc_pipefs_event,
261 .priority = SUNRPC_PIPEFS_RPC_PRIO,
262 };
263
264 int rpc_clients_notifier_register(void)
265 {
266 return rpc_pipefs_notifier_register(&rpc_clients_block);
267 }
268
269 void rpc_clients_notifier_unregister(void)
270 {
271 return rpc_pipefs_notifier_unregister(&rpc_clients_block);
272 }
273
274 static void rpc_clnt_set_nodename(struct rpc_clnt *clnt, const char *nodename)
275 {
276 clnt->cl_nodelen = strlen(nodename);
277 if (clnt->cl_nodelen > UNX_MAXNODENAME)
278 clnt->cl_nodelen = UNX_MAXNODENAME;
279 memcpy(clnt->cl_nodename, nodename, clnt->cl_nodelen);
280 }
281
282 static int rpc_client_register(const struct rpc_create_args *args,
283 struct rpc_clnt *clnt)
284 {
285 const struct rpc_program *program = args->program;
286 struct rpc_auth *auth;
287 struct net *net = rpc_net_ns(clnt);
288 struct super_block *pipefs_sb;
289 int err;
290
291 pipefs_sb = rpc_get_sb_net(net);
292 if (pipefs_sb) {
293 err = rpc_setup_pipedir(clnt, program->pipe_dir_name, pipefs_sb);
294 if (err)
295 goto out;
296 }
297
298 rpc_register_client(clnt);
299 if (pipefs_sb)
300 rpc_put_sb_net(net);
301
302 auth = rpcauth_create(args->authflavor, clnt);
303 if (IS_ERR(auth)) {
304 dprintk("RPC: Couldn't create auth handle (flavor %u)\n",
305 args->authflavor);
306 err = PTR_ERR(auth);
307 goto err_auth;
308 }
309 return 0;
310 err_auth:
311 pipefs_sb = rpc_get_sb_net(net);
312 __rpc_clnt_remove_pipedir(clnt);
313 out:
314 if (pipefs_sb)
315 rpc_put_sb_net(net);
316 return err;
317 }
318
319 static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, struct rpc_xprt *xprt)
320 {
321 const struct rpc_program *program = args->program;
322 const struct rpc_version *version;
323 struct rpc_clnt *clnt = NULL;
324 int err;
325
326 /* sanity check the name before trying to print it */
327 dprintk("RPC: creating %s client for %s (xprt %p)\n",
328 program->name, args->servername, xprt);
329
330 err = rpciod_up();
331 if (err)
332 goto out_no_rpciod;
333
334 err = -EINVAL;
335 if (args->version >= program->nrvers)
336 goto out_err;
337 version = program->version[args->version];
338 if (version == NULL)
339 goto out_err;
340
341 err = -ENOMEM;
342 clnt = kzalloc(sizeof(*clnt), GFP_KERNEL);
343 if (!clnt)
344 goto out_err;
345 clnt->cl_parent = clnt;
346
347 rcu_assign_pointer(clnt->cl_xprt, xprt);
348 clnt->cl_procinfo = version->procs;
349 clnt->cl_maxproc = version->nrprocs;
350 clnt->cl_protname = program->name;
351 clnt->cl_prog = args->prognumber ? : program->number;
352 clnt->cl_vers = version->number;
353 clnt->cl_stats = program->stats;
354 clnt->cl_metrics = rpc_alloc_iostats(clnt);
355 err = -ENOMEM;
356 if (clnt->cl_metrics == NULL)
357 goto out_no_stats;
358 clnt->cl_program = program;
359 INIT_LIST_HEAD(&clnt->cl_tasks);
360 spin_lock_init(&clnt->cl_lock);
361
362 if (!xprt_bound(xprt))
363 clnt->cl_autobind = 1;
364
365 clnt->cl_timeout = xprt->timeout;
366 if (args->timeout != NULL) {
367 memcpy(&clnt->cl_timeout_default, args->timeout,
368 sizeof(clnt->cl_timeout_default));
369 clnt->cl_timeout = &clnt->cl_timeout_default;
370 }
371
372 clnt->cl_rtt = &clnt->cl_rtt_default;
373 rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval);
374 clnt->cl_principal = NULL;
375 if (args->client_name) {
376 clnt->cl_principal = kstrdup(args->client_name, GFP_KERNEL);
377 if (!clnt->cl_principal)
378 goto out_no_principal;
379 }
380
381 atomic_set(&clnt->cl_count, 1);
382
383 /* save the nodename */
384 rpc_clnt_set_nodename(clnt, utsname()->nodename);
385
386 err = rpc_client_register(args, clnt);
387 if (err)
388 goto out_no_path;
389 return clnt;
390
391 out_no_path:
392 kfree(clnt->cl_principal);
393 out_no_principal:
394 rpc_free_iostats(clnt->cl_metrics);
395 out_no_stats:
396 kfree(clnt);
397 out_err:
398 rpciod_down();
399 out_no_rpciod:
400 xprt_put(xprt);
401 return ERR_PTR(err);
402 }
403
404 /**
405 * rpc_create - create an RPC client and transport with one call
406 * @args: rpc_clnt create argument structure
407 *
408 * Creates and initializes an RPC transport and an RPC client.
409 *
410 * It can ping the server in order to determine if it is up, and to see if
411 * it supports this program and version. RPC_CLNT_CREATE_NOPING disables
412 * this behavior so asynchronous tasks can also use rpc_create.
413 */
414 struct rpc_clnt *rpc_create(struct rpc_create_args *args)
415 {
416 struct rpc_xprt *xprt;
417 struct rpc_clnt *clnt;
418 struct xprt_create xprtargs = {
419 .net = args->net,
420 .ident = args->protocol,
421 .srcaddr = args->saddress,
422 .dstaddr = args->address,
423 .addrlen = args->addrsize,
424 .servername = args->servername,
425 .bc_xprt = args->bc_xprt,
426 };
427 char servername[48];
428
429 if (args->flags & RPC_CLNT_CREATE_INFINITE_SLOTS)
430 xprtargs.flags |= XPRT_CREATE_INFINITE_SLOTS;
431 if (args->flags & RPC_CLNT_CREATE_NO_IDLE_TIMEOUT)
432 xprtargs.flags |= XPRT_CREATE_NO_IDLE_TIMEOUT;
433 /*
434 * If the caller chooses not to specify a hostname, whip
435 * up a string representation of the passed-in address.
436 */
437 if (xprtargs.servername == NULL) {
438 struct sockaddr_un *sun =
439 (struct sockaddr_un *)args->address;
440 struct sockaddr_in *sin =
441 (struct sockaddr_in *)args->address;
442 struct sockaddr_in6 *sin6 =
443 (struct sockaddr_in6 *)args->address;
444
445 servername[0] = '\0';
446 switch (args->address->sa_family) {
447 case AF_LOCAL:
448 snprintf(servername, sizeof(servername), "%s",
449 sun->sun_path);
450 break;
451 case AF_INET:
452 snprintf(servername, sizeof(servername), "%pI4",
453 &sin->sin_addr.s_addr);
454 break;
455 case AF_INET6:
456 snprintf(servername, sizeof(servername), "%pI6",
457 &sin6->sin6_addr);
458 break;
459 default:
460 /* caller wants default server name, but
461 * address family isn't recognized. */
462 return ERR_PTR(-EINVAL);
463 }
464 xprtargs.servername = servername;
465 }
466
467 xprt = xprt_create_transport(&xprtargs);
468 if (IS_ERR(xprt))
469 return (struct rpc_clnt *)xprt;
470
471 /*
472 * By default, kernel RPC client connects from a reserved port.
473 * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters,
474 * but it is always enabled for rpciod, which handles the connect
475 * operation.
476 */
477 xprt->resvport = 1;
478 if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT)
479 xprt->resvport = 0;
480
481 clnt = rpc_new_client(args, xprt);
482 if (IS_ERR(clnt))
483 return clnt;
484
485 if (!(args->flags & RPC_CLNT_CREATE_NOPING)) {
486 int err = rpc_ping(clnt);
487 if (err != 0) {
488 rpc_shutdown_client(clnt);
489 return ERR_PTR(err);
490 }
491 }
492
493 clnt->cl_softrtry = 1;
494 if (args->flags & RPC_CLNT_CREATE_HARDRTRY)
495 clnt->cl_softrtry = 0;
496
497 if (args->flags & RPC_CLNT_CREATE_AUTOBIND)
498 clnt->cl_autobind = 1;
499 if (args->flags & RPC_CLNT_CREATE_DISCRTRY)
500 clnt->cl_discrtry = 1;
501 if (!(args->flags & RPC_CLNT_CREATE_QUIET))
502 clnt->cl_chatty = 1;
503
504 return clnt;
505 }
506 EXPORT_SYMBOL_GPL(rpc_create);
507
508 /*
509 * This function clones the RPC client structure. It allows us to share the
510 * same transport while varying parameters such as the authentication
511 * flavour.
512 */
513 static struct rpc_clnt *__rpc_clone_client(struct rpc_create_args *args,
514 struct rpc_clnt *clnt)
515 {
516 struct rpc_xprt *xprt;
517 struct rpc_clnt *new;
518 int err;
519
520 err = -ENOMEM;
521 rcu_read_lock();
522 xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
523 rcu_read_unlock();
524 if (xprt == NULL)
525 goto out_err;
526 args->servername = xprt->servername;
527
528 new = rpc_new_client(args, xprt);
529 if (IS_ERR(new)) {
530 err = PTR_ERR(new);
531 goto out_err;
532 }
533
534 atomic_inc(&clnt->cl_count);
535 new->cl_parent = clnt;
536
537 /* Turn off autobind on clones */
538 new->cl_autobind = 0;
539 new->cl_softrtry = clnt->cl_softrtry;
540 new->cl_discrtry = clnt->cl_discrtry;
541 new->cl_chatty = clnt->cl_chatty;
542 return new;
543
544 out_err:
545 dprintk("RPC: %s: returned error %d\n", __func__, err);
546 return ERR_PTR(err);
547 }
548
549 /**
550 * rpc_clone_client - Clone an RPC client structure
551 *
552 * @clnt: RPC client whose parameters are copied
553 *
554 * Returns a fresh RPC client or an ERR_PTR.
555 */
556 struct rpc_clnt *rpc_clone_client(struct rpc_clnt *clnt)
557 {
558 struct rpc_create_args args = {
559 .program = clnt->cl_program,
560 .prognumber = clnt->cl_prog,
561 .version = clnt->cl_vers,
562 .authflavor = clnt->cl_auth->au_flavor,
563 .client_name = clnt->cl_principal,
564 };
565 return __rpc_clone_client(&args, clnt);
566 }
567 EXPORT_SYMBOL_GPL(rpc_clone_client);
568
569 /**
570 * rpc_clone_client_set_auth - Clone an RPC client structure and set its auth
571 *
572 * @clnt: RPC client whose parameters are copied
573 * @flavor: security flavor for new client
574 *
575 * Returns a fresh RPC client or an ERR_PTR.
576 */
577 struct rpc_clnt *
578 rpc_clone_client_set_auth(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
579 {
580 struct rpc_create_args args = {
581 .program = clnt->cl_program,
582 .prognumber = clnt->cl_prog,
583 .version = clnt->cl_vers,
584 .authflavor = flavor,
585 .client_name = clnt->cl_principal,
586 };
587 return __rpc_clone_client(&args, clnt);
588 }
589 EXPORT_SYMBOL_GPL(rpc_clone_client_set_auth);
590
591 /*
592 * Kill all tasks for the given client.
593 * XXX: kill their descendants as well?
594 */
595 void rpc_killall_tasks(struct rpc_clnt *clnt)
596 {
597 struct rpc_task *rovr;
598
599
600 if (list_empty(&clnt->cl_tasks))
601 return;
602 dprintk("RPC: killing all tasks for client %p\n", clnt);
603 /*
604 * Spin lock all_tasks to prevent changes...
605 */
606 spin_lock(&clnt->cl_lock);
607 list_for_each_entry(rovr, &clnt->cl_tasks, tk_task) {
608 if (!RPC_IS_ACTIVATED(rovr))
609 continue;
610 if (!(rovr->tk_flags & RPC_TASK_KILLED)) {
611 rovr->tk_flags |= RPC_TASK_KILLED;
612 rpc_exit(rovr, -EIO);
613 if (RPC_IS_QUEUED(rovr))
614 rpc_wake_up_queued_task(rovr->tk_waitqueue,
615 rovr);
616 }
617 }
618 spin_unlock(&clnt->cl_lock);
619 }
620 EXPORT_SYMBOL_GPL(rpc_killall_tasks);
621
622 /*
623 * Properly shut down an RPC client, terminating all outstanding
624 * requests.
625 */
626 void rpc_shutdown_client(struct rpc_clnt *clnt)
627 {
628 might_sleep();
629
630 dprintk_rcu("RPC: shutting down %s client for %s\n",
631 clnt->cl_protname,
632 rcu_dereference(clnt->cl_xprt)->servername);
633
634 while (!list_empty(&clnt->cl_tasks)) {
635 rpc_killall_tasks(clnt);
636 wait_event_timeout(destroy_wait,
637 list_empty(&clnt->cl_tasks), 1*HZ);
638 }
639
640 rpc_release_client(clnt);
641 }
642 EXPORT_SYMBOL_GPL(rpc_shutdown_client);
643
644 /*
645 * Free an RPC client
646 */
647 static void
648 rpc_free_client(struct rpc_clnt *clnt)
649 {
650 dprintk_rcu("RPC: destroying %s client for %s\n",
651 clnt->cl_protname,
652 rcu_dereference(clnt->cl_xprt)->servername);
653 if (clnt->cl_parent != clnt)
654 rpc_release_client(clnt->cl_parent);
655 rpc_clnt_remove_pipedir(clnt);
656 rpc_unregister_client(clnt);
657 rpc_free_iostats(clnt->cl_metrics);
658 kfree(clnt->cl_principal);
659 clnt->cl_metrics = NULL;
660 xprt_put(rcu_dereference_raw(clnt->cl_xprt));
661 rpciod_down();
662 kfree(clnt);
663 }
664
665 /*
666 * Free an RPC client
667 */
668 static void
669 rpc_free_auth(struct rpc_clnt *clnt)
670 {
671 if (clnt->cl_auth == NULL) {
672 rpc_free_client(clnt);
673 return;
674 }
675
676 /*
677 * Note: RPCSEC_GSS may need to send NULL RPC calls in order to
678 * release remaining GSS contexts. This mechanism ensures
679 * that it can do so safely.
680 */
681 atomic_inc(&clnt->cl_count);
682 rpcauth_release(clnt->cl_auth);
683 clnt->cl_auth = NULL;
684 if (atomic_dec_and_test(&clnt->cl_count))
685 rpc_free_client(clnt);
686 }
687
688 /*
689 * Release reference to the RPC client
690 */
691 void
692 rpc_release_client(struct rpc_clnt *clnt)
693 {
694 dprintk("RPC: rpc_release_client(%p)\n", clnt);
695
696 if (list_empty(&clnt->cl_tasks))
697 wake_up(&destroy_wait);
698 if (atomic_dec_and_test(&clnt->cl_count))
699 rpc_free_auth(clnt);
700 }
701 EXPORT_SYMBOL_GPL(rpc_release_client);
702
703 /**
704 * rpc_bind_new_program - bind a new RPC program to an existing client
705 * @old: old rpc_client
706 * @program: rpc program to set
707 * @vers: rpc program version
708 *
709 * Clones the rpc client and sets up a new RPC program. This is mainly
710 * of use for enabling different RPC programs to share the same transport.
711 * The Sun NFSv2/v3 ACL protocol can do this.
712 */
713 struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old,
714 const struct rpc_program *program,
715 u32 vers)
716 {
717 struct rpc_create_args args = {
718 .program = program,
719 .prognumber = program->number,
720 .version = vers,
721 .authflavor = old->cl_auth->au_flavor,
722 .client_name = old->cl_principal,
723 };
724 struct rpc_clnt *clnt;
725 int err;
726
727 clnt = __rpc_clone_client(&args, old);
728 if (IS_ERR(clnt))
729 goto out;
730 err = rpc_ping(clnt);
731 if (err != 0) {
732 rpc_shutdown_client(clnt);
733 clnt = ERR_PTR(err);
734 }
735 out:
736 return clnt;
737 }
738 EXPORT_SYMBOL_GPL(rpc_bind_new_program);
739
740 void rpc_task_release_client(struct rpc_task *task)
741 {
742 struct rpc_clnt *clnt = task->tk_client;
743
744 if (clnt != NULL) {
745 /* Remove from client task list */
746 spin_lock(&clnt->cl_lock);
747 list_del(&task->tk_task);
748 spin_unlock(&clnt->cl_lock);
749 task->tk_client = NULL;
750
751 rpc_release_client(clnt);
752 }
753 }
754
755 static
756 void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt)
757 {
758 if (clnt != NULL) {
759 rpc_task_release_client(task);
760 task->tk_client = clnt;
761 atomic_inc(&clnt->cl_count);
762 if (clnt->cl_softrtry)
763 task->tk_flags |= RPC_TASK_SOFT;
764 if (sk_memalloc_socks()) {
765 struct rpc_xprt *xprt;
766
767 rcu_read_lock();
768 xprt = rcu_dereference(clnt->cl_xprt);
769 if (xprt->swapper)
770 task->tk_flags |= RPC_TASK_SWAPPER;
771 rcu_read_unlock();
772 }
773 /* Add to the client's list of all tasks */
774 spin_lock(&clnt->cl_lock);
775 list_add_tail(&task->tk_task, &clnt->cl_tasks);
776 spin_unlock(&clnt->cl_lock);
777 }
778 }
779
780 void rpc_task_reset_client(struct rpc_task *task, struct rpc_clnt *clnt)
781 {
782 rpc_task_release_client(task);
783 rpc_task_set_client(task, clnt);
784 }
785 EXPORT_SYMBOL_GPL(rpc_task_reset_client);
786
787
788 static void
789 rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg)
790 {
791 if (msg != NULL) {
792 task->tk_msg.rpc_proc = msg->rpc_proc;
793 task->tk_msg.rpc_argp = msg->rpc_argp;
794 task->tk_msg.rpc_resp = msg->rpc_resp;
795 if (msg->rpc_cred != NULL)
796 task->tk_msg.rpc_cred = get_rpccred(msg->rpc_cred);
797 }
798 }
799
800 /*
801 * Default callback for async RPC calls
802 */
803 static void
804 rpc_default_callback(struct rpc_task *task, void *data)
805 {
806 }
807
808 static const struct rpc_call_ops rpc_default_ops = {
809 .rpc_call_done = rpc_default_callback,
810 };
811
812 /**
813 * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it
814 * @task_setup_data: pointer to task initialisation data
815 */
816 struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data)
817 {
818 struct rpc_task *task;
819
820 task = rpc_new_task(task_setup_data);
821 if (IS_ERR(task))
822 goto out;
823
824 rpc_task_set_client(task, task_setup_data->rpc_client);
825 rpc_task_set_rpc_message(task, task_setup_data->rpc_message);
826
827 if (task->tk_action == NULL)
828 rpc_call_start(task);
829
830 atomic_inc(&task->tk_count);
831 rpc_execute(task);
832 out:
833 return task;
834 }
835 EXPORT_SYMBOL_GPL(rpc_run_task);
836
837 /**
838 * rpc_call_sync - Perform a synchronous RPC call
839 * @clnt: pointer to RPC client
840 * @msg: RPC call parameters
841 * @flags: RPC call flags
842 */
843 int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags)
844 {
845 struct rpc_task *task;
846 struct rpc_task_setup task_setup_data = {
847 .rpc_client = clnt,
848 .rpc_message = msg,
849 .callback_ops = &rpc_default_ops,
850 .flags = flags,
851 };
852 int status;
853
854 WARN_ON_ONCE(flags & RPC_TASK_ASYNC);
855 if (flags & RPC_TASK_ASYNC) {
856 rpc_release_calldata(task_setup_data.callback_ops,
857 task_setup_data.callback_data);
858 return -EINVAL;
859 }
860
861 task = rpc_run_task(&task_setup_data);
862 if (IS_ERR(task))
863 return PTR_ERR(task);
864 status = task->tk_status;
865 rpc_put_task(task);
866 return status;
867 }
868 EXPORT_SYMBOL_GPL(rpc_call_sync);
869
870 /**
871 * rpc_call_async - Perform an asynchronous RPC call
872 * @clnt: pointer to RPC client
873 * @msg: RPC call parameters
874 * @flags: RPC call flags
875 * @tk_ops: RPC call ops
876 * @data: user call data
877 */
878 int
879 rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags,
880 const struct rpc_call_ops *tk_ops, void *data)
881 {
882 struct rpc_task *task;
883 struct rpc_task_setup task_setup_data = {
884 .rpc_client = clnt,
885 .rpc_message = msg,
886 .callback_ops = tk_ops,
887 .callback_data = data,
888 .flags = flags|RPC_TASK_ASYNC,
889 };
890
891 task = rpc_run_task(&task_setup_data);
892 if (IS_ERR(task))
893 return PTR_ERR(task);
894 rpc_put_task(task);
895 return 0;
896 }
897 EXPORT_SYMBOL_GPL(rpc_call_async);
898
899 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
900 /**
901 * rpc_run_bc_task - Allocate a new RPC task for backchannel use, then run
902 * rpc_execute against it
903 * @req: RPC request
904 * @tk_ops: RPC call ops
905 */
906 struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req,
907 const struct rpc_call_ops *tk_ops)
908 {
909 struct rpc_task *task;
910 struct xdr_buf *xbufp = &req->rq_snd_buf;
911 struct rpc_task_setup task_setup_data = {
912 .callback_ops = tk_ops,
913 };
914
915 dprintk("RPC: rpc_run_bc_task req= %p\n", req);
916 /*
917 * Create an rpc_task to send the data
918 */
919 task = rpc_new_task(&task_setup_data);
920 if (IS_ERR(task)) {
921 xprt_free_bc_request(req);
922 goto out;
923 }
924 task->tk_rqstp = req;
925
926 /*
927 * Set up the xdr_buf length.
928 * This also indicates that the buffer is XDR encoded already.
929 */
930 xbufp->len = xbufp->head[0].iov_len + xbufp->page_len +
931 xbufp->tail[0].iov_len;
932
933 task->tk_action = call_bc_transmit;
934 atomic_inc(&task->tk_count);
935 WARN_ON_ONCE(atomic_read(&task->tk_count) != 2);
936 rpc_execute(task);
937
938 out:
939 dprintk("RPC: rpc_run_bc_task: task= %p\n", task);
940 return task;
941 }
942 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
943
944 void
945 rpc_call_start(struct rpc_task *task)
946 {
947 task->tk_action = call_start;
948 }
949 EXPORT_SYMBOL_GPL(rpc_call_start);
950
951 /**
952 * rpc_peeraddr - extract remote peer address from clnt's xprt
953 * @clnt: RPC client structure
954 * @buf: target buffer
955 * @bufsize: length of target buffer
956 *
957 * Returns the number of bytes that are actually in the stored address.
958 */
959 size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize)
960 {
961 size_t bytes;
962 struct rpc_xprt *xprt;
963
964 rcu_read_lock();
965 xprt = rcu_dereference(clnt->cl_xprt);
966
967 bytes = xprt->addrlen;
968 if (bytes > bufsize)
969 bytes = bufsize;
970 memcpy(buf, &xprt->addr, bytes);
971 rcu_read_unlock();
972
973 return bytes;
974 }
975 EXPORT_SYMBOL_GPL(rpc_peeraddr);
976
977 /**
978 * rpc_peeraddr2str - return remote peer address in printable format
979 * @clnt: RPC client structure
980 * @format: address format
981 *
982 * NB: the lifetime of the memory referenced by the returned pointer is
983 * the same as the rpc_xprt itself. As long as the caller uses this
984 * pointer, it must hold the RCU read lock.
985 */
986 const char *rpc_peeraddr2str(struct rpc_clnt *clnt,
987 enum rpc_display_format_t format)
988 {
989 struct rpc_xprt *xprt;
990
991 xprt = rcu_dereference(clnt->cl_xprt);
992
993 if (xprt->address_strings[format] != NULL)
994 return xprt->address_strings[format];
995 else
996 return "unprintable";
997 }
998 EXPORT_SYMBOL_GPL(rpc_peeraddr2str);
999
1000 static const struct sockaddr_in rpc_inaddr_loopback = {
1001 .sin_family = AF_INET,
1002 .sin_addr.s_addr = htonl(INADDR_ANY),
1003 };
1004
1005 static const struct sockaddr_in6 rpc_in6addr_loopback = {
1006 .sin6_family = AF_INET6,
1007 .sin6_addr = IN6ADDR_ANY_INIT,
1008 };
1009
1010 /*
1011 * Try a getsockname() on a connected datagram socket. Using a
1012 * connected datagram socket prevents leaving a socket in TIME_WAIT.
1013 * This conserves the ephemeral port number space.
1014 *
1015 * Returns zero and fills in "buf" if successful; otherwise, a
1016 * negative errno is returned.
1017 */
1018 static int rpc_sockname(struct net *net, struct sockaddr *sap, size_t salen,
1019 struct sockaddr *buf, int buflen)
1020 {
1021 struct socket *sock;
1022 int err;
1023
1024 err = __sock_create(net, sap->sa_family,
1025 SOCK_DGRAM, IPPROTO_UDP, &sock, 1);
1026 if (err < 0) {
1027 dprintk("RPC: can't create UDP socket (%d)\n", err);
1028 goto out;
1029 }
1030
1031 switch (sap->sa_family) {
1032 case AF_INET:
1033 err = kernel_bind(sock,
1034 (struct sockaddr *)&rpc_inaddr_loopback,
1035 sizeof(rpc_inaddr_loopback));
1036 break;
1037 case AF_INET6:
1038 err = kernel_bind(sock,
1039 (struct sockaddr *)&rpc_in6addr_loopback,
1040 sizeof(rpc_in6addr_loopback));
1041 break;
1042 default:
1043 err = -EAFNOSUPPORT;
1044 goto out;
1045 }
1046 if (err < 0) {
1047 dprintk("RPC: can't bind UDP socket (%d)\n", err);
1048 goto out_release;
1049 }
1050
1051 err = kernel_connect(sock, sap, salen, 0);
1052 if (err < 0) {
1053 dprintk("RPC: can't connect UDP socket (%d)\n", err);
1054 goto out_release;
1055 }
1056
1057 err = kernel_getsockname(sock, buf, &buflen);
1058 if (err < 0) {
1059 dprintk("RPC: getsockname failed (%d)\n", err);
1060 goto out_release;
1061 }
1062
1063 err = 0;
1064 if (buf->sa_family == AF_INET6) {
1065 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)buf;
1066 sin6->sin6_scope_id = 0;
1067 }
1068 dprintk("RPC: %s succeeded\n", __func__);
1069
1070 out_release:
1071 sock_release(sock);
1072 out:
1073 return err;
1074 }
1075
1076 /*
1077 * Scraping a connected socket failed, so we don't have a useable
1078 * local address. Fallback: generate an address that will prevent
1079 * the server from calling us back.
1080 *
1081 * Returns zero and fills in "buf" if successful; otherwise, a
1082 * negative errno is returned.
1083 */
1084 static int rpc_anyaddr(int family, struct sockaddr *buf, size_t buflen)
1085 {
1086 switch (family) {
1087 case AF_INET:
1088 if (buflen < sizeof(rpc_inaddr_loopback))
1089 return -EINVAL;
1090 memcpy(buf, &rpc_inaddr_loopback,
1091 sizeof(rpc_inaddr_loopback));
1092 break;
1093 case AF_INET6:
1094 if (buflen < sizeof(rpc_in6addr_loopback))
1095 return -EINVAL;
1096 memcpy(buf, &rpc_in6addr_loopback,
1097 sizeof(rpc_in6addr_loopback));
1098 default:
1099 dprintk("RPC: %s: address family not supported\n",
1100 __func__);
1101 return -EAFNOSUPPORT;
1102 }
1103 dprintk("RPC: %s: succeeded\n", __func__);
1104 return 0;
1105 }
1106
1107 /**
1108 * rpc_localaddr - discover local endpoint address for an RPC client
1109 * @clnt: RPC client structure
1110 * @buf: target buffer
1111 * @buflen: size of target buffer, in bytes
1112 *
1113 * Returns zero and fills in "buf" and "buflen" if successful;
1114 * otherwise, a negative errno is returned.
1115 *
1116 * This works even if the underlying transport is not currently connected,
1117 * or if the upper layer never previously provided a source address.
1118 *
1119 * The result of this function call is transient: multiple calls in
1120 * succession may give different results, depending on how local
1121 * networking configuration changes over time.
1122 */
1123 int rpc_localaddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t buflen)
1124 {
1125 struct sockaddr_storage address;
1126 struct sockaddr *sap = (struct sockaddr *)&address;
1127 struct rpc_xprt *xprt;
1128 struct net *net;
1129 size_t salen;
1130 int err;
1131
1132 rcu_read_lock();
1133 xprt = rcu_dereference(clnt->cl_xprt);
1134 salen = xprt->addrlen;
1135 memcpy(sap, &xprt->addr, salen);
1136 net = get_net(xprt->xprt_net);
1137 rcu_read_unlock();
1138
1139 rpc_set_port(sap, 0);
1140 err = rpc_sockname(net, sap, salen, buf, buflen);
1141 put_net(net);
1142 if (err != 0)
1143 /* Couldn't discover local address, return ANYADDR */
1144 return rpc_anyaddr(sap->sa_family, buf, buflen);
1145 return 0;
1146 }
1147 EXPORT_SYMBOL_GPL(rpc_localaddr);
1148
1149 void
1150 rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize)
1151 {
1152 struct rpc_xprt *xprt;
1153
1154 rcu_read_lock();
1155 xprt = rcu_dereference(clnt->cl_xprt);
1156 if (xprt->ops->set_buffer_size)
1157 xprt->ops->set_buffer_size(xprt, sndsize, rcvsize);
1158 rcu_read_unlock();
1159 }
1160 EXPORT_SYMBOL_GPL(rpc_setbufsize);
1161
1162 /**
1163 * rpc_protocol - Get transport protocol number for an RPC client
1164 * @clnt: RPC client to query
1165 *
1166 */
1167 int rpc_protocol(struct rpc_clnt *clnt)
1168 {
1169 int protocol;
1170
1171 rcu_read_lock();
1172 protocol = rcu_dereference(clnt->cl_xprt)->prot;
1173 rcu_read_unlock();
1174 return protocol;
1175 }
1176 EXPORT_SYMBOL_GPL(rpc_protocol);
1177
1178 /**
1179 * rpc_net_ns - Get the network namespace for this RPC client
1180 * @clnt: RPC client to query
1181 *
1182 */
1183 struct net *rpc_net_ns(struct rpc_clnt *clnt)
1184 {
1185 struct net *ret;
1186
1187 rcu_read_lock();
1188 ret = rcu_dereference(clnt->cl_xprt)->xprt_net;
1189 rcu_read_unlock();
1190 return ret;
1191 }
1192 EXPORT_SYMBOL_GPL(rpc_net_ns);
1193
1194 /**
1195 * rpc_max_payload - Get maximum payload size for a transport, in bytes
1196 * @clnt: RPC client to query
1197 *
1198 * For stream transports, this is one RPC record fragment (see RFC
1199 * 1831), as we don't support multi-record requests yet. For datagram
1200 * transports, this is the size of an IP packet minus the IP, UDP, and
1201 * RPC header sizes.
1202 */
1203 size_t rpc_max_payload(struct rpc_clnt *clnt)
1204 {
1205 size_t ret;
1206
1207 rcu_read_lock();
1208 ret = rcu_dereference(clnt->cl_xprt)->max_payload;
1209 rcu_read_unlock();
1210 return ret;
1211 }
1212 EXPORT_SYMBOL_GPL(rpc_max_payload);
1213
1214 /**
1215 * rpc_get_timeout - Get timeout for transport in units of HZ
1216 * @clnt: RPC client to query
1217 */
1218 unsigned long rpc_get_timeout(struct rpc_clnt *clnt)
1219 {
1220 unsigned long ret;
1221
1222 rcu_read_lock();
1223 ret = rcu_dereference(clnt->cl_xprt)->timeout->to_initval;
1224 rcu_read_unlock();
1225 return ret;
1226 }
1227 EXPORT_SYMBOL_GPL(rpc_get_timeout);
1228
1229 /**
1230 * rpc_force_rebind - force transport to check that remote port is unchanged
1231 * @clnt: client to rebind
1232 *
1233 */
1234 void rpc_force_rebind(struct rpc_clnt *clnt)
1235 {
1236 if (clnt->cl_autobind) {
1237 rcu_read_lock();
1238 xprt_clear_bound(rcu_dereference(clnt->cl_xprt));
1239 rcu_read_unlock();
1240 }
1241 }
1242 EXPORT_SYMBOL_GPL(rpc_force_rebind);
1243
1244 /*
1245 * Restart an (async) RPC call from the call_prepare state.
1246 * Usually called from within the exit handler.
1247 */
1248 int
1249 rpc_restart_call_prepare(struct rpc_task *task)
1250 {
1251 if (RPC_ASSASSINATED(task))
1252 return 0;
1253 task->tk_action = call_start;
1254 if (task->tk_ops->rpc_call_prepare != NULL)
1255 task->tk_action = rpc_prepare_task;
1256 return 1;
1257 }
1258 EXPORT_SYMBOL_GPL(rpc_restart_call_prepare);
1259
1260 /*
1261 * Restart an (async) RPC call. Usually called from within the
1262 * exit handler.
1263 */
1264 int
1265 rpc_restart_call(struct rpc_task *task)
1266 {
1267 if (RPC_ASSASSINATED(task))
1268 return 0;
1269 task->tk_action = call_start;
1270 return 1;
1271 }
1272 EXPORT_SYMBOL_GPL(rpc_restart_call);
1273
1274 #ifdef RPC_DEBUG
1275 static const char *rpc_proc_name(const struct rpc_task *task)
1276 {
1277 const struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
1278
1279 if (proc) {
1280 if (proc->p_name)
1281 return proc->p_name;
1282 else
1283 return "NULL";
1284 } else
1285 return "no proc";
1286 }
1287 #endif
1288
1289 /*
1290 * 0. Initial state
1291 *
1292 * Other FSM states can be visited zero or more times, but
1293 * this state is visited exactly once for each RPC.
1294 */
1295 static void
1296 call_start(struct rpc_task *task)
1297 {
1298 struct rpc_clnt *clnt = task->tk_client;
1299
1300 dprintk("RPC: %5u call_start %s%d proc %s (%s)\n", task->tk_pid,
1301 clnt->cl_protname, clnt->cl_vers,
1302 rpc_proc_name(task),
1303 (RPC_IS_ASYNC(task) ? "async" : "sync"));
1304
1305 /* Increment call count */
1306 task->tk_msg.rpc_proc->p_count++;
1307 clnt->cl_stats->rpccnt++;
1308 task->tk_action = call_reserve;
1309 }
1310
1311 /*
1312 * 1. Reserve an RPC call slot
1313 */
1314 static void
1315 call_reserve(struct rpc_task *task)
1316 {
1317 dprint_status(task);
1318
1319 task->tk_status = 0;
1320 task->tk_action = call_reserveresult;
1321 xprt_reserve(task);
1322 }
1323
1324 static void call_retry_reserve(struct rpc_task *task);
1325
1326 /*
1327 * 1b. Grok the result of xprt_reserve()
1328 */
1329 static void
1330 call_reserveresult(struct rpc_task *task)
1331 {
1332 int status = task->tk_status;
1333
1334 dprint_status(task);
1335
1336 /*
1337 * After a call to xprt_reserve(), we must have either
1338 * a request slot or else an error status.
1339 */
1340 task->tk_status = 0;
1341 if (status >= 0) {
1342 if (task->tk_rqstp) {
1343 task->tk_action = call_refresh;
1344 return;
1345 }
1346
1347 printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n",
1348 __func__, status);
1349 rpc_exit(task, -EIO);
1350 return;
1351 }
1352
1353 /*
1354 * Even though there was an error, we may have acquired
1355 * a request slot somehow. Make sure not to leak it.
1356 */
1357 if (task->tk_rqstp) {
1358 printk(KERN_ERR "%s: status=%d, request allocated anyway\n",
1359 __func__, status);
1360 xprt_release(task);
1361 }
1362
1363 switch (status) {
1364 case -ENOMEM:
1365 rpc_delay(task, HZ >> 2);
1366 case -EAGAIN: /* woken up; retry */
1367 task->tk_action = call_retry_reserve;
1368 return;
1369 case -EIO: /* probably a shutdown */
1370 break;
1371 default:
1372 printk(KERN_ERR "%s: unrecognized error %d, exiting\n",
1373 __func__, status);
1374 break;
1375 }
1376 rpc_exit(task, status);
1377 }
1378
1379 /*
1380 * 1c. Retry reserving an RPC call slot
1381 */
1382 static void
1383 call_retry_reserve(struct rpc_task *task)
1384 {
1385 dprint_status(task);
1386
1387 task->tk_status = 0;
1388 task->tk_action = call_reserveresult;
1389 xprt_retry_reserve(task);
1390 }
1391
1392 /*
1393 * 2. Bind and/or refresh the credentials
1394 */
1395 static void
1396 call_refresh(struct rpc_task *task)
1397 {
1398 dprint_status(task);
1399
1400 task->tk_action = call_refreshresult;
1401 task->tk_status = 0;
1402 task->tk_client->cl_stats->rpcauthrefresh++;
1403 rpcauth_refreshcred(task);
1404 }
1405
1406 /*
1407 * 2a. Process the results of a credential refresh
1408 */
1409 static void
1410 call_refreshresult(struct rpc_task *task)
1411 {
1412 int status = task->tk_status;
1413
1414 dprint_status(task);
1415
1416 task->tk_status = 0;
1417 task->tk_action = call_refresh;
1418 switch (status) {
1419 case 0:
1420 if (rpcauth_uptodatecred(task))
1421 task->tk_action = call_allocate;
1422 return;
1423 case -ETIMEDOUT:
1424 rpc_delay(task, 3*HZ);
1425 case -EKEYEXPIRED:
1426 case -EAGAIN:
1427 status = -EACCES;
1428 if (!task->tk_cred_retry)
1429 break;
1430 task->tk_cred_retry--;
1431 dprintk("RPC: %5u %s: retry refresh creds\n",
1432 task->tk_pid, __func__);
1433 return;
1434 }
1435 dprintk("RPC: %5u %s: refresh creds failed with error %d\n",
1436 task->tk_pid, __func__, status);
1437 rpc_exit(task, status);
1438 }
1439
1440 /*
1441 * 2b. Allocate the buffer. For details, see sched.c:rpc_malloc.
1442 * (Note: buffer memory is freed in xprt_release).
1443 */
1444 static void
1445 call_allocate(struct rpc_task *task)
1446 {
1447 unsigned int slack = task->tk_rqstp->rq_cred->cr_auth->au_cslack;
1448 struct rpc_rqst *req = task->tk_rqstp;
1449 struct rpc_xprt *xprt = req->rq_xprt;
1450 struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
1451
1452 dprint_status(task);
1453
1454 task->tk_status = 0;
1455 task->tk_action = call_bind;
1456
1457 if (req->rq_buffer)
1458 return;
1459
1460 if (proc->p_proc != 0) {
1461 BUG_ON(proc->p_arglen == 0);
1462 if (proc->p_decode != NULL)
1463 BUG_ON(proc->p_replen == 0);
1464 }
1465
1466 /*
1467 * Calculate the size (in quads) of the RPC call
1468 * and reply headers, and convert both values
1469 * to byte sizes.
1470 */
1471 req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen;
1472 req->rq_callsize <<= 2;
1473 req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen;
1474 req->rq_rcvsize <<= 2;
1475
1476 req->rq_buffer = xprt->ops->buf_alloc(task,
1477 req->rq_callsize + req->rq_rcvsize);
1478 if (req->rq_buffer != NULL)
1479 return;
1480
1481 dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid);
1482
1483 if (RPC_IS_ASYNC(task) || !fatal_signal_pending(current)) {
1484 task->tk_action = call_allocate;
1485 rpc_delay(task, HZ>>4);
1486 return;
1487 }
1488
1489 rpc_exit(task, -ERESTARTSYS);
1490 }
1491
1492 static inline int
1493 rpc_task_need_encode(struct rpc_task *task)
1494 {
1495 return task->tk_rqstp->rq_snd_buf.len == 0;
1496 }
1497
1498 static inline void
1499 rpc_task_force_reencode(struct rpc_task *task)
1500 {
1501 task->tk_rqstp->rq_snd_buf.len = 0;
1502 task->tk_rqstp->rq_bytes_sent = 0;
1503 }
1504
1505 static inline void
1506 rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len)
1507 {
1508 buf->head[0].iov_base = start;
1509 buf->head[0].iov_len = len;
1510 buf->tail[0].iov_len = 0;
1511 buf->page_len = 0;
1512 buf->flags = 0;
1513 buf->len = 0;
1514 buf->buflen = len;
1515 }
1516
1517 /*
1518 * 3. Encode arguments of an RPC call
1519 */
1520 static void
1521 rpc_xdr_encode(struct rpc_task *task)
1522 {
1523 struct rpc_rqst *req = task->tk_rqstp;
1524 kxdreproc_t encode;
1525 __be32 *p;
1526
1527 dprint_status(task);
1528
1529 rpc_xdr_buf_init(&req->rq_snd_buf,
1530 req->rq_buffer,
1531 req->rq_callsize);
1532 rpc_xdr_buf_init(&req->rq_rcv_buf,
1533 (char *)req->rq_buffer + req->rq_callsize,
1534 req->rq_rcvsize);
1535
1536 p = rpc_encode_header(task);
1537 if (p == NULL) {
1538 printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n");
1539 rpc_exit(task, -EIO);
1540 return;
1541 }
1542
1543 encode = task->tk_msg.rpc_proc->p_encode;
1544 if (encode == NULL)
1545 return;
1546
1547 task->tk_status = rpcauth_wrap_req(task, encode, req, p,
1548 task->tk_msg.rpc_argp);
1549 }
1550
1551 /*
1552 * 4. Get the server port number if not yet set
1553 */
1554 static void
1555 call_bind(struct rpc_task *task)
1556 {
1557 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
1558
1559 dprint_status(task);
1560
1561 task->tk_action = call_connect;
1562 if (!xprt_bound(xprt)) {
1563 task->tk_action = call_bind_status;
1564 task->tk_timeout = xprt->bind_timeout;
1565 xprt->ops->rpcbind(task);
1566 }
1567 }
1568
1569 /*
1570 * 4a. Sort out bind result
1571 */
1572 static void
1573 call_bind_status(struct rpc_task *task)
1574 {
1575 int status = -EIO;
1576
1577 if (task->tk_status >= 0) {
1578 dprint_status(task);
1579 task->tk_status = 0;
1580 task->tk_action = call_connect;
1581 return;
1582 }
1583
1584 trace_rpc_bind_status(task);
1585 switch (task->tk_status) {
1586 case -ENOMEM:
1587 dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid);
1588 rpc_delay(task, HZ >> 2);
1589 goto retry_timeout;
1590 case -EACCES:
1591 dprintk("RPC: %5u remote rpcbind: RPC program/version "
1592 "unavailable\n", task->tk_pid);
1593 /* fail immediately if this is an RPC ping */
1594 if (task->tk_msg.rpc_proc->p_proc == 0) {
1595 status = -EOPNOTSUPP;
1596 break;
1597 }
1598 if (task->tk_rebind_retry == 0)
1599 break;
1600 task->tk_rebind_retry--;
1601 rpc_delay(task, 3*HZ);
1602 goto retry_timeout;
1603 case -ETIMEDOUT:
1604 dprintk("RPC: %5u rpcbind request timed out\n",
1605 task->tk_pid);
1606 goto retry_timeout;
1607 case -EPFNOSUPPORT:
1608 /* server doesn't support any rpcbind version we know of */
1609 dprintk("RPC: %5u unrecognized remote rpcbind service\n",
1610 task->tk_pid);
1611 break;
1612 case -EPROTONOSUPPORT:
1613 dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n",
1614 task->tk_pid);
1615 task->tk_status = 0;
1616 task->tk_action = call_bind;
1617 return;
1618 case -ECONNREFUSED: /* connection problems */
1619 case -ECONNRESET:
1620 case -ENOTCONN:
1621 case -EHOSTDOWN:
1622 case -EHOSTUNREACH:
1623 case -ENETUNREACH:
1624 case -EPIPE:
1625 dprintk("RPC: %5u remote rpcbind unreachable: %d\n",
1626 task->tk_pid, task->tk_status);
1627 if (!RPC_IS_SOFTCONN(task)) {
1628 rpc_delay(task, 5*HZ);
1629 goto retry_timeout;
1630 }
1631 status = task->tk_status;
1632 break;
1633 default:
1634 dprintk("RPC: %5u unrecognized rpcbind error (%d)\n",
1635 task->tk_pid, -task->tk_status);
1636 }
1637
1638 rpc_exit(task, status);
1639 return;
1640
1641 retry_timeout:
1642 task->tk_action = call_timeout;
1643 }
1644
1645 /*
1646 * 4b. Connect to the RPC server
1647 */
1648 static void
1649 call_connect(struct rpc_task *task)
1650 {
1651 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
1652
1653 dprintk("RPC: %5u call_connect xprt %p %s connected\n",
1654 task->tk_pid, xprt,
1655 (xprt_connected(xprt) ? "is" : "is not"));
1656
1657 task->tk_action = call_transmit;
1658 if (!xprt_connected(xprt)) {
1659 task->tk_action = call_connect_status;
1660 if (task->tk_status < 0)
1661 return;
1662 xprt_connect(task);
1663 }
1664 }
1665
1666 /*
1667 * 4c. Sort out connect result
1668 */
1669 static void
1670 call_connect_status(struct rpc_task *task)
1671 {
1672 struct rpc_clnt *clnt = task->tk_client;
1673 int status = task->tk_status;
1674
1675 dprint_status(task);
1676
1677 trace_rpc_connect_status(task, status);
1678 switch (status) {
1679 /* if soft mounted, test if we've timed out */
1680 case -ETIMEDOUT:
1681 task->tk_action = call_timeout;
1682 return;
1683 case -ECONNREFUSED:
1684 case -ECONNRESET:
1685 case -ENETUNREACH:
1686 if (RPC_IS_SOFTCONN(task))
1687 break;
1688 /* retry with existing socket, after a delay */
1689 case 0:
1690 case -EAGAIN:
1691 task->tk_status = 0;
1692 clnt->cl_stats->netreconn++;
1693 task->tk_action = call_transmit;
1694 return;
1695 }
1696 rpc_exit(task, status);
1697 }
1698
1699 /*
1700 * 5. Transmit the RPC request, and wait for reply
1701 */
1702 static void
1703 call_transmit(struct rpc_task *task)
1704 {
1705 dprint_status(task);
1706
1707 task->tk_action = call_status;
1708 if (task->tk_status < 0)
1709 return;
1710 task->tk_status = xprt_prepare_transmit(task);
1711 if (task->tk_status != 0)
1712 return;
1713 task->tk_action = call_transmit_status;
1714 /* Encode here so that rpcsec_gss can use correct sequence number. */
1715 if (rpc_task_need_encode(task)) {
1716 rpc_xdr_encode(task);
1717 /* Did the encode result in an error condition? */
1718 if (task->tk_status != 0) {
1719 /* Was the error nonfatal? */
1720 if (task->tk_status == -EAGAIN)
1721 rpc_delay(task, HZ >> 4);
1722 else
1723 rpc_exit(task, task->tk_status);
1724 return;
1725 }
1726 }
1727 xprt_transmit(task);
1728 if (task->tk_status < 0)
1729 return;
1730 /*
1731 * On success, ensure that we call xprt_end_transmit() before sleeping
1732 * in order to allow access to the socket to other RPC requests.
1733 */
1734 call_transmit_status(task);
1735 if (rpc_reply_expected(task))
1736 return;
1737 task->tk_action = rpc_exit_task;
1738 rpc_wake_up_queued_task(&task->tk_rqstp->rq_xprt->pending, task);
1739 }
1740
1741 /*
1742 * 5a. Handle cleanup after a transmission
1743 */
1744 static void
1745 call_transmit_status(struct rpc_task *task)
1746 {
1747 task->tk_action = call_status;
1748
1749 /*
1750 * Common case: success. Force the compiler to put this
1751 * test first.
1752 */
1753 if (task->tk_status == 0) {
1754 xprt_end_transmit(task);
1755 rpc_task_force_reencode(task);
1756 return;
1757 }
1758
1759 switch (task->tk_status) {
1760 case -EAGAIN:
1761 break;
1762 default:
1763 dprint_status(task);
1764 xprt_end_transmit(task);
1765 rpc_task_force_reencode(task);
1766 break;
1767 /*
1768 * Special cases: if we've been waiting on the
1769 * socket's write_space() callback, or if the
1770 * socket just returned a connection error,
1771 * then hold onto the transport lock.
1772 */
1773 case -ECONNREFUSED:
1774 case -EHOSTDOWN:
1775 case -EHOSTUNREACH:
1776 case -ENETUNREACH:
1777 if (RPC_IS_SOFTCONN(task)) {
1778 xprt_end_transmit(task);
1779 rpc_exit(task, task->tk_status);
1780 break;
1781 }
1782 case -ECONNRESET:
1783 case -ENOTCONN:
1784 case -EPIPE:
1785 rpc_task_force_reencode(task);
1786 }
1787 }
1788
1789 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1790 /*
1791 * 5b. Send the backchannel RPC reply. On error, drop the reply. In
1792 * addition, disconnect on connectivity errors.
1793 */
1794 static void
1795 call_bc_transmit(struct rpc_task *task)
1796 {
1797 struct rpc_rqst *req = task->tk_rqstp;
1798
1799 task->tk_status = xprt_prepare_transmit(task);
1800 if (task->tk_status == -EAGAIN) {
1801 /*
1802 * Could not reserve the transport. Try again after the
1803 * transport is released.
1804 */
1805 task->tk_status = 0;
1806 task->tk_action = call_bc_transmit;
1807 return;
1808 }
1809
1810 task->tk_action = rpc_exit_task;
1811 if (task->tk_status < 0) {
1812 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
1813 "error: %d\n", task->tk_status);
1814 return;
1815 }
1816
1817 xprt_transmit(task);
1818 xprt_end_transmit(task);
1819 dprint_status(task);
1820 switch (task->tk_status) {
1821 case 0:
1822 /* Success */
1823 break;
1824 case -EHOSTDOWN:
1825 case -EHOSTUNREACH:
1826 case -ENETUNREACH:
1827 case -ETIMEDOUT:
1828 /*
1829 * Problem reaching the server. Disconnect and let the
1830 * forechannel reestablish the connection. The server will
1831 * have to retransmit the backchannel request and we'll
1832 * reprocess it. Since these ops are idempotent, there's no
1833 * need to cache our reply at this time.
1834 */
1835 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
1836 "error: %d\n", task->tk_status);
1837 xprt_conditional_disconnect(req->rq_xprt,
1838 req->rq_connect_cookie);
1839 break;
1840 default:
1841 /*
1842 * We were unable to reply and will have to drop the
1843 * request. The server should reconnect and retransmit.
1844 */
1845 WARN_ON_ONCE(task->tk_status == -EAGAIN);
1846 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
1847 "error: %d\n", task->tk_status);
1848 break;
1849 }
1850 rpc_wake_up_queued_task(&req->rq_xprt->pending, task);
1851 }
1852 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1853
1854 /*
1855 * 6. Sort out the RPC call status
1856 */
1857 static void
1858 call_status(struct rpc_task *task)
1859 {
1860 struct rpc_clnt *clnt = task->tk_client;
1861 struct rpc_rqst *req = task->tk_rqstp;
1862 int status;
1863
1864 if (req->rq_reply_bytes_recvd > 0 && !req->rq_bytes_sent)
1865 task->tk_status = req->rq_reply_bytes_recvd;
1866
1867 dprint_status(task);
1868
1869 status = task->tk_status;
1870 if (status >= 0) {
1871 task->tk_action = call_decode;
1872 return;
1873 }
1874
1875 trace_rpc_call_status(task);
1876 task->tk_status = 0;
1877 switch(status) {
1878 case -EHOSTDOWN:
1879 case -EHOSTUNREACH:
1880 case -ENETUNREACH:
1881 /*
1882 * Delay any retries for 3 seconds, then handle as if it
1883 * were a timeout.
1884 */
1885 rpc_delay(task, 3*HZ);
1886 case -ETIMEDOUT:
1887 task->tk_action = call_timeout;
1888 if (task->tk_client->cl_discrtry)
1889 xprt_conditional_disconnect(req->rq_xprt,
1890 req->rq_connect_cookie);
1891 break;
1892 case -ECONNRESET:
1893 case -ECONNREFUSED:
1894 rpc_force_rebind(clnt);
1895 rpc_delay(task, 3*HZ);
1896 case -EPIPE:
1897 case -ENOTCONN:
1898 task->tk_action = call_bind;
1899 break;
1900 case -EAGAIN:
1901 task->tk_action = call_transmit;
1902 break;
1903 case -EIO:
1904 /* shutdown or soft timeout */
1905 rpc_exit(task, status);
1906 break;
1907 default:
1908 if (clnt->cl_chatty)
1909 printk("%s: RPC call returned error %d\n",
1910 clnt->cl_protname, -status);
1911 rpc_exit(task, status);
1912 }
1913 }
1914
1915 /*
1916 * 6a. Handle RPC timeout
1917 * We do not release the request slot, so we keep using the
1918 * same XID for all retransmits.
1919 */
1920 static void
1921 call_timeout(struct rpc_task *task)
1922 {
1923 struct rpc_clnt *clnt = task->tk_client;
1924
1925 if (xprt_adjust_timeout(task->tk_rqstp) == 0) {
1926 dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid);
1927 goto retry;
1928 }
1929
1930 dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid);
1931 task->tk_timeouts++;
1932
1933 if (RPC_IS_SOFTCONN(task)) {
1934 rpc_exit(task, -ETIMEDOUT);
1935 return;
1936 }
1937 if (RPC_IS_SOFT(task)) {
1938 if (clnt->cl_chatty) {
1939 rcu_read_lock();
1940 printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
1941 clnt->cl_protname,
1942 rcu_dereference(clnt->cl_xprt)->servername);
1943 rcu_read_unlock();
1944 }
1945 if (task->tk_flags & RPC_TASK_TIMEOUT)
1946 rpc_exit(task, -ETIMEDOUT);
1947 else
1948 rpc_exit(task, -EIO);
1949 return;
1950 }
1951
1952 if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) {
1953 task->tk_flags |= RPC_CALL_MAJORSEEN;
1954 if (clnt->cl_chatty) {
1955 rcu_read_lock();
1956 printk(KERN_NOTICE "%s: server %s not responding, still trying\n",
1957 clnt->cl_protname,
1958 rcu_dereference(clnt->cl_xprt)->servername);
1959 rcu_read_unlock();
1960 }
1961 }
1962 rpc_force_rebind(clnt);
1963 /*
1964 * Did our request time out due to an RPCSEC_GSS out-of-sequence
1965 * event? RFC2203 requires the server to drop all such requests.
1966 */
1967 rpcauth_invalcred(task);
1968
1969 retry:
1970 clnt->cl_stats->rpcretrans++;
1971 task->tk_action = call_bind;
1972 task->tk_status = 0;
1973 }
1974
1975 /*
1976 * 7. Decode the RPC reply
1977 */
1978 static void
1979 call_decode(struct rpc_task *task)
1980 {
1981 struct rpc_clnt *clnt = task->tk_client;
1982 struct rpc_rqst *req = task->tk_rqstp;
1983 kxdrdproc_t decode = task->tk_msg.rpc_proc->p_decode;
1984 __be32 *p;
1985
1986 dprint_status(task);
1987
1988 if (task->tk_flags & RPC_CALL_MAJORSEEN) {
1989 if (clnt->cl_chatty) {
1990 rcu_read_lock();
1991 printk(KERN_NOTICE "%s: server %s OK\n",
1992 clnt->cl_protname,
1993 rcu_dereference(clnt->cl_xprt)->servername);
1994 rcu_read_unlock();
1995 }
1996 task->tk_flags &= ~RPC_CALL_MAJORSEEN;
1997 }
1998
1999 /*
2000 * Ensure that we see all writes made by xprt_complete_rqst()
2001 * before it changed req->rq_reply_bytes_recvd.
2002 */
2003 smp_rmb();
2004 req->rq_rcv_buf.len = req->rq_private_buf.len;
2005
2006 /* Check that the softirq receive buffer is valid */
2007 WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf,
2008 sizeof(req->rq_rcv_buf)) != 0);
2009
2010 if (req->rq_rcv_buf.len < 12) {
2011 if (!RPC_IS_SOFT(task)) {
2012 task->tk_action = call_bind;
2013 clnt->cl_stats->rpcretrans++;
2014 goto out_retry;
2015 }
2016 dprintk("RPC: %s: too small RPC reply size (%d bytes)\n",
2017 clnt->cl_protname, task->tk_status);
2018 task->tk_action = call_timeout;
2019 goto out_retry;
2020 }
2021
2022 p = rpc_verify_header(task);
2023 if (IS_ERR(p)) {
2024 if (p == ERR_PTR(-EAGAIN))
2025 goto out_retry;
2026 return;
2027 }
2028
2029 task->tk_action = rpc_exit_task;
2030
2031 if (decode) {
2032 task->tk_status = rpcauth_unwrap_resp(task, decode, req, p,
2033 task->tk_msg.rpc_resp);
2034 }
2035 dprintk("RPC: %5u call_decode result %d\n", task->tk_pid,
2036 task->tk_status);
2037 return;
2038 out_retry:
2039 task->tk_status = 0;
2040 /* Note: rpc_verify_header() may have freed the RPC slot */
2041 if (task->tk_rqstp == req) {
2042 req->rq_reply_bytes_recvd = req->rq_rcv_buf.len = 0;
2043 if (task->tk_client->cl_discrtry)
2044 xprt_conditional_disconnect(req->rq_xprt,
2045 req->rq_connect_cookie);
2046 }
2047 }
2048
2049 static __be32 *
2050 rpc_encode_header(struct rpc_task *task)
2051 {
2052 struct rpc_clnt *clnt = task->tk_client;
2053 struct rpc_rqst *req = task->tk_rqstp;
2054 __be32 *p = req->rq_svec[0].iov_base;
2055
2056 /* FIXME: check buffer size? */
2057
2058 p = xprt_skip_transport_header(req->rq_xprt, p);
2059 *p++ = req->rq_xid; /* XID */
2060 *p++ = htonl(RPC_CALL); /* CALL */
2061 *p++ = htonl(RPC_VERSION); /* RPC version */
2062 *p++ = htonl(clnt->cl_prog); /* program number */
2063 *p++ = htonl(clnt->cl_vers); /* program version */
2064 *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */
2065 p = rpcauth_marshcred(task, p);
2066 req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p);
2067 return p;
2068 }
2069
2070 static __be32 *
2071 rpc_verify_header(struct rpc_task *task)
2072 {
2073 struct rpc_clnt *clnt = task->tk_client;
2074 struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0];
2075 int len = task->tk_rqstp->rq_rcv_buf.len >> 2;
2076 __be32 *p = iov->iov_base;
2077 u32 n;
2078 int error = -EACCES;
2079
2080 if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) {
2081 /* RFC-1014 says that the representation of XDR data must be a
2082 * multiple of four bytes
2083 * - if it isn't pointer subtraction in the NFS client may give
2084 * undefined results
2085 */
2086 dprintk("RPC: %5u %s: XDR representation not a multiple of"
2087 " 4 bytes: 0x%x\n", task->tk_pid, __func__,
2088 task->tk_rqstp->rq_rcv_buf.len);
2089 goto out_eio;
2090 }
2091 if ((len -= 3) < 0)
2092 goto out_overflow;
2093
2094 p += 1; /* skip XID */
2095 if ((n = ntohl(*p++)) != RPC_REPLY) {
2096 dprintk("RPC: %5u %s: not an RPC reply: %x\n",
2097 task->tk_pid, __func__, n);
2098 goto out_garbage;
2099 }
2100
2101 if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) {
2102 if (--len < 0)
2103 goto out_overflow;
2104 switch ((n = ntohl(*p++))) {
2105 case RPC_AUTH_ERROR:
2106 break;
2107 case RPC_MISMATCH:
2108 dprintk("RPC: %5u %s: RPC call version mismatch!\n",
2109 task->tk_pid, __func__);
2110 error = -EPROTONOSUPPORT;
2111 goto out_err;
2112 default:
2113 dprintk("RPC: %5u %s: RPC call rejected, "
2114 "unknown error: %x\n",
2115 task->tk_pid, __func__, n);
2116 goto out_eio;
2117 }
2118 if (--len < 0)
2119 goto out_overflow;
2120 switch ((n = ntohl(*p++))) {
2121 case RPC_AUTH_REJECTEDCRED:
2122 case RPC_AUTH_REJECTEDVERF:
2123 case RPCSEC_GSS_CREDPROBLEM:
2124 case RPCSEC_GSS_CTXPROBLEM:
2125 if (!task->tk_cred_retry)
2126 break;
2127 task->tk_cred_retry--;
2128 dprintk("RPC: %5u %s: retry stale creds\n",
2129 task->tk_pid, __func__);
2130 rpcauth_invalcred(task);
2131 /* Ensure we obtain a new XID! */
2132 xprt_release(task);
2133 task->tk_action = call_reserve;
2134 goto out_retry;
2135 case RPC_AUTH_BADCRED:
2136 case RPC_AUTH_BADVERF:
2137 /* possibly garbled cred/verf? */
2138 if (!task->tk_garb_retry)
2139 break;
2140 task->tk_garb_retry--;
2141 dprintk("RPC: %5u %s: retry garbled creds\n",
2142 task->tk_pid, __func__);
2143 task->tk_action = call_bind;
2144 goto out_retry;
2145 case RPC_AUTH_TOOWEAK:
2146 rcu_read_lock();
2147 printk(KERN_NOTICE "RPC: server %s requires stronger "
2148 "authentication.\n",
2149 rcu_dereference(clnt->cl_xprt)->servername);
2150 rcu_read_unlock();
2151 break;
2152 default:
2153 dprintk("RPC: %5u %s: unknown auth error: %x\n",
2154 task->tk_pid, __func__, n);
2155 error = -EIO;
2156 }
2157 dprintk("RPC: %5u %s: call rejected %d\n",
2158 task->tk_pid, __func__, n);
2159 goto out_err;
2160 }
2161 if (!(p = rpcauth_checkverf(task, p))) {
2162 dprintk("RPC: %5u %s: auth check failed\n",
2163 task->tk_pid, __func__);
2164 goto out_garbage; /* bad verifier, retry */
2165 }
2166 len = p - (__be32 *)iov->iov_base - 1;
2167 if (len < 0)
2168 goto out_overflow;
2169 switch ((n = ntohl(*p++))) {
2170 case RPC_SUCCESS:
2171 return p;
2172 case RPC_PROG_UNAVAIL:
2173 dprintk_rcu("RPC: %5u %s: program %u is unsupported "
2174 "by server %s\n", task->tk_pid, __func__,
2175 (unsigned int)clnt->cl_prog,
2176 rcu_dereference(clnt->cl_xprt)->servername);
2177 error = -EPFNOSUPPORT;
2178 goto out_err;
2179 case RPC_PROG_MISMATCH:
2180 dprintk_rcu("RPC: %5u %s: program %u, version %u unsupported "
2181 "by server %s\n", task->tk_pid, __func__,
2182 (unsigned int)clnt->cl_prog,
2183 (unsigned int)clnt->cl_vers,
2184 rcu_dereference(clnt->cl_xprt)->servername);
2185 error = -EPROTONOSUPPORT;
2186 goto out_err;
2187 case RPC_PROC_UNAVAIL:
2188 dprintk_rcu("RPC: %5u %s: proc %s unsupported by program %u, "
2189 "version %u on server %s\n",
2190 task->tk_pid, __func__,
2191 rpc_proc_name(task),
2192 clnt->cl_prog, clnt->cl_vers,
2193 rcu_dereference(clnt->cl_xprt)->servername);
2194 error = -EOPNOTSUPP;
2195 goto out_err;
2196 case RPC_GARBAGE_ARGS:
2197 dprintk("RPC: %5u %s: server saw garbage\n",
2198 task->tk_pid, __func__);
2199 break; /* retry */
2200 default:
2201 dprintk("RPC: %5u %s: server accept status: %x\n",
2202 task->tk_pid, __func__, n);
2203 /* Also retry */
2204 }
2205
2206 out_garbage:
2207 clnt->cl_stats->rpcgarbage++;
2208 if (task->tk_garb_retry) {
2209 task->tk_garb_retry--;
2210 dprintk("RPC: %5u %s: retrying\n",
2211 task->tk_pid, __func__);
2212 task->tk_action = call_bind;
2213 out_retry:
2214 return ERR_PTR(-EAGAIN);
2215 }
2216 out_eio:
2217 error = -EIO;
2218 out_err:
2219 rpc_exit(task, error);
2220 dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid,
2221 __func__, error);
2222 return ERR_PTR(error);
2223 out_overflow:
2224 dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid,
2225 __func__);
2226 goto out_garbage;
2227 }
2228
2229 static void rpcproc_encode_null(void *rqstp, struct xdr_stream *xdr, void *obj)
2230 {
2231 }
2232
2233 static int rpcproc_decode_null(void *rqstp, struct xdr_stream *xdr, void *obj)
2234 {
2235 return 0;
2236 }
2237
2238 static struct rpc_procinfo rpcproc_null = {
2239 .p_encode = rpcproc_encode_null,
2240 .p_decode = rpcproc_decode_null,
2241 };
2242
2243 static int rpc_ping(struct rpc_clnt *clnt)
2244 {
2245 struct rpc_message msg = {
2246 .rpc_proc = &rpcproc_null,
2247 };
2248 int err;
2249 msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0);
2250 err = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN);
2251 put_rpccred(msg.rpc_cred);
2252 return err;
2253 }
2254
2255 struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags)
2256 {
2257 struct rpc_message msg = {
2258 .rpc_proc = &rpcproc_null,
2259 .rpc_cred = cred,
2260 };
2261 struct rpc_task_setup task_setup_data = {
2262 .rpc_client = clnt,
2263 .rpc_message = &msg,
2264 .callback_ops = &rpc_default_ops,
2265 .flags = flags,
2266 };
2267 return rpc_run_task(&task_setup_data);
2268 }
2269 EXPORT_SYMBOL_GPL(rpc_call_null);
2270
2271 #ifdef RPC_DEBUG
2272 static void rpc_show_header(void)
2273 {
2274 printk(KERN_INFO "-pid- flgs status -client- --rqstp- "
2275 "-timeout ---ops--\n");
2276 }
2277
2278 static void rpc_show_task(const struct rpc_clnt *clnt,
2279 const struct rpc_task *task)
2280 {
2281 const char *rpc_waitq = "none";
2282
2283 if (RPC_IS_QUEUED(task))
2284 rpc_waitq = rpc_qname(task->tk_waitqueue);
2285
2286 printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%ps q:%s\n",
2287 task->tk_pid, task->tk_flags, task->tk_status,
2288 clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops,
2289 clnt->cl_protname, clnt->cl_vers, rpc_proc_name(task),
2290 task->tk_action, rpc_waitq);
2291 }
2292
2293 void rpc_show_tasks(struct net *net)
2294 {
2295 struct rpc_clnt *clnt;
2296 struct rpc_task *task;
2297 int header = 0;
2298 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
2299
2300 spin_lock(&sn->rpc_client_lock);
2301 list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
2302 spin_lock(&clnt->cl_lock);
2303 list_for_each_entry(task, &clnt->cl_tasks, tk_task) {
2304 if (!header) {
2305 rpc_show_header();
2306 header++;
2307 }
2308 rpc_show_task(clnt, task);
2309 }
2310 spin_unlock(&clnt->cl_lock);
2311 }
2312 spin_unlock(&sn->rpc_client_lock);
2313 }
2314 #endif
Linux with added FPC-III support