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22#include <linux/module.h>
23#include <linux/types.h>
24#include <linux/kallsyms.h>
25#include <linux/mm.h>
26#include <linux/namei.h>
27#include <linux/mount.h>
28#include <linux/slab.h>
29#include <linux/rcupdate.h>
30#include <linux/utsname.h>
31#include <linux/workqueue.h>
32#include <linux/in.h>
33#include <linux/in6.h>
34#include <linux/un.h>
35
36#include <linux/sunrpc/clnt.h>
37#include <linux/sunrpc/addr.h>
38#include <linux/sunrpc/rpc_pipe_fs.h>
39#include <linux/sunrpc/metrics.h>
40#include <linux/sunrpc/bc_xprt.h>
41#include <trace/events/sunrpc.h>
42
43#include "sunrpc.h"
44#include "netns.h"
45
46#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
47# define RPCDBG_FACILITY RPCDBG_CALL
48#endif
49
50#define dprint_status(t) \
51 dprintk("RPC: %5u %s (status %d)\n", t->tk_pid, \
52 __func__, t->tk_status)
53
54
55
56
57
58static DECLARE_WAIT_QUEUE_HEAD(destroy_wait);
59
60
61static void call_start(struct rpc_task *task);
62static void call_reserve(struct rpc_task *task);
63static void call_reserveresult(struct rpc_task *task);
64static void call_allocate(struct rpc_task *task);
65static void call_encode(struct rpc_task *task);
66static void call_decode(struct rpc_task *task);
67static void call_bind(struct rpc_task *task);
68static void call_bind_status(struct rpc_task *task);
69static void call_transmit(struct rpc_task *task);
70static void call_status(struct rpc_task *task);
71static void call_transmit_status(struct rpc_task *task);
72static void call_refresh(struct rpc_task *task);
73static void call_refreshresult(struct rpc_task *task);
74static void call_connect(struct rpc_task *task);
75static void call_connect_status(struct rpc_task *task);
76
77static int rpc_encode_header(struct rpc_task *task,
78 struct xdr_stream *xdr);
79static int rpc_decode_header(struct rpc_task *task,
80 struct xdr_stream *xdr);
81static int rpc_ping(struct rpc_clnt *clnt);
82static void rpc_check_timeout(struct rpc_task *task);
83
84static void rpc_register_client(struct rpc_clnt *clnt)
85{
86 struct net *net = rpc_net_ns(clnt);
87 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
88
89 spin_lock(&sn->rpc_client_lock);
90 list_add(&clnt->cl_clients, &sn->all_clients);
91 spin_unlock(&sn->rpc_client_lock);
92}
93
94static void rpc_unregister_client(struct rpc_clnt *clnt)
95{
96 struct net *net = rpc_net_ns(clnt);
97 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
98
99 spin_lock(&sn->rpc_client_lock);
100 list_del(&clnt->cl_clients);
101 spin_unlock(&sn->rpc_client_lock);
102}
103
104static void __rpc_clnt_remove_pipedir(struct rpc_clnt *clnt)
105{
106 rpc_remove_client_dir(clnt);
107}
108
109static void rpc_clnt_remove_pipedir(struct rpc_clnt *clnt)
110{
111 struct net *net = rpc_net_ns(clnt);
112 struct super_block *pipefs_sb;
113
114 pipefs_sb = rpc_get_sb_net(net);
115 if (pipefs_sb) {
116 __rpc_clnt_remove_pipedir(clnt);
117 rpc_put_sb_net(net);
118 }
119}
120
121static struct dentry *rpc_setup_pipedir_sb(struct super_block *sb,
122 struct rpc_clnt *clnt)
123{
124 static uint32_t clntid;
125 const char *dir_name = clnt->cl_program->pipe_dir_name;
126 char name[15];
127 struct dentry *dir, *dentry;
128
129 dir = rpc_d_lookup_sb(sb, dir_name);
130 if (dir == NULL) {
131 pr_info("RPC: pipefs directory doesn't exist: %s\n", dir_name);
132 return dir;
133 }
134 for (;;) {
135 snprintf(name, sizeof(name), "clnt%x", (unsigned int)clntid++);
136 name[sizeof(name) - 1] = '\0';
137 dentry = rpc_create_client_dir(dir, name, clnt);
138 if (!IS_ERR(dentry))
139 break;
140 if (dentry == ERR_PTR(-EEXIST))
141 continue;
142 printk(KERN_INFO "RPC: Couldn't create pipefs entry"
143 " %s/%s, error %ld\n",
144 dir_name, name, PTR_ERR(dentry));
145 break;
146 }
147 dput(dir);
148 return dentry;
149}
150
151static int
152rpc_setup_pipedir(struct super_block *pipefs_sb, struct rpc_clnt *clnt)
153{
154 struct dentry *dentry;
155
156 if (clnt->cl_program->pipe_dir_name != NULL) {
157 dentry = rpc_setup_pipedir_sb(pipefs_sb, clnt);
158 if (IS_ERR(dentry))
159 return PTR_ERR(dentry);
160 }
161 return 0;
162}
163
164static int rpc_clnt_skip_event(struct rpc_clnt *clnt, unsigned long event)
165{
166 if (clnt->cl_program->pipe_dir_name == NULL)
167 return 1;
168
169 switch (event) {
170 case RPC_PIPEFS_MOUNT:
171 if (clnt->cl_pipedir_objects.pdh_dentry != NULL)
172 return 1;
173 if (atomic_read(&clnt->cl_count) == 0)
174 return 1;
175 break;
176 case RPC_PIPEFS_UMOUNT:
177 if (clnt->cl_pipedir_objects.pdh_dentry == NULL)
178 return 1;
179 break;
180 }
181 return 0;
182}
183
184static int __rpc_clnt_handle_event(struct rpc_clnt *clnt, unsigned long event,
185 struct super_block *sb)
186{
187 struct dentry *dentry;
188
189 switch (event) {
190 case RPC_PIPEFS_MOUNT:
191 dentry = rpc_setup_pipedir_sb(sb, clnt);
192 if (!dentry)
193 return -ENOENT;
194 if (IS_ERR(dentry))
195 return PTR_ERR(dentry);
196 break;
197 case RPC_PIPEFS_UMOUNT:
198 __rpc_clnt_remove_pipedir(clnt);
199 break;
200 default:
201 printk(KERN_ERR "%s: unknown event: %ld\n", __func__, event);
202 return -ENOTSUPP;
203 }
204 return 0;
205}
206
207static int __rpc_pipefs_event(struct rpc_clnt *clnt, unsigned long event,
208 struct super_block *sb)
209{
210 int error = 0;
211
212 for (;; clnt = clnt->cl_parent) {
213 if (!rpc_clnt_skip_event(clnt, event))
214 error = __rpc_clnt_handle_event(clnt, event, sb);
215 if (error || clnt == clnt->cl_parent)
216 break;
217 }
218 return error;
219}
220
221static struct rpc_clnt *rpc_get_client_for_event(struct net *net, int event)
222{
223 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
224 struct rpc_clnt *clnt;
225
226 spin_lock(&sn->rpc_client_lock);
227 list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
228 if (rpc_clnt_skip_event(clnt, event))
229 continue;
230 spin_unlock(&sn->rpc_client_lock);
231 return clnt;
232 }
233 spin_unlock(&sn->rpc_client_lock);
234 return NULL;
235}
236
237static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
238 void *ptr)
239{
240 struct super_block *sb = ptr;
241 struct rpc_clnt *clnt;
242 int error = 0;
243
244 while ((clnt = rpc_get_client_for_event(sb->s_fs_info, event))) {
245 error = __rpc_pipefs_event(clnt, event, sb);
246 if (error)
247 break;
248 }
249 return error;
250}
251
252static struct notifier_block rpc_clients_block = {
253 .notifier_call = rpc_pipefs_event,
254 .priority = SUNRPC_PIPEFS_RPC_PRIO,
255};
256
257int rpc_clients_notifier_register(void)
258{
259 return rpc_pipefs_notifier_register(&rpc_clients_block);
260}
261
262void rpc_clients_notifier_unregister(void)
263{
264 return rpc_pipefs_notifier_unregister(&rpc_clients_block);
265}
266
267static struct rpc_xprt *rpc_clnt_set_transport(struct rpc_clnt *clnt,
268 struct rpc_xprt *xprt,
269 const struct rpc_timeout *timeout)
270{
271 struct rpc_xprt *old;
272
273 spin_lock(&clnt->cl_lock);
274 old = rcu_dereference_protected(clnt->cl_xprt,
275 lockdep_is_held(&clnt->cl_lock));
276
277 if (!xprt_bound(xprt))
278 clnt->cl_autobind = 1;
279
280 clnt->cl_timeout = timeout;
281 rcu_assign_pointer(clnt->cl_xprt, xprt);
282 spin_unlock(&clnt->cl_lock);
283
284 return old;
285}
286
287static void rpc_clnt_set_nodename(struct rpc_clnt *clnt, const char *nodename)
288{
289 clnt->cl_nodelen = strlcpy(clnt->cl_nodename,
290 nodename, sizeof(clnt->cl_nodename));
291}
292
293static int rpc_client_register(struct rpc_clnt *clnt,
294 rpc_authflavor_t pseudoflavor,
295 const char *client_name)
296{
297 struct rpc_auth_create_args auth_args = {
298 .pseudoflavor = pseudoflavor,
299 .target_name = client_name,
300 };
301 struct rpc_auth *auth;
302 struct net *net = rpc_net_ns(clnt);
303 struct super_block *pipefs_sb;
304 int err;
305
306 rpc_clnt_debugfs_register(clnt);
307
308 pipefs_sb = rpc_get_sb_net(net);
309 if (pipefs_sb) {
310 err = rpc_setup_pipedir(pipefs_sb, clnt);
311 if (err)
312 goto out;
313 }
314
315 rpc_register_client(clnt);
316 if (pipefs_sb)
317 rpc_put_sb_net(net);
318
319 auth = rpcauth_create(&auth_args, clnt);
320 if (IS_ERR(auth)) {
321 dprintk("RPC: Couldn't create auth handle (flavor %u)\n",
322 pseudoflavor);
323 err = PTR_ERR(auth);
324 goto err_auth;
325 }
326 return 0;
327err_auth:
328 pipefs_sb = rpc_get_sb_net(net);
329 rpc_unregister_client(clnt);
330 __rpc_clnt_remove_pipedir(clnt);
331out:
332 if (pipefs_sb)
333 rpc_put_sb_net(net);
334 rpc_clnt_debugfs_unregister(clnt);
335 return err;
336}
337
338static DEFINE_IDA(rpc_clids);
339
340void rpc_cleanup_clids(void)
341{
342 ida_destroy(&rpc_clids);
343}
344
345static int rpc_alloc_clid(struct rpc_clnt *clnt)
346{
347 int clid;
348
349 clid = ida_simple_get(&rpc_clids, 0, 0, GFP_KERNEL);
350 if (clid < 0)
351 return clid;
352 clnt->cl_clid = clid;
353 return 0;
354}
355
356static void rpc_free_clid(struct rpc_clnt *clnt)
357{
358 ida_simple_remove(&rpc_clids, clnt->cl_clid);
359}
360
361static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args,
362 struct rpc_xprt_switch *xps,
363 struct rpc_xprt *xprt,
364 struct rpc_clnt *parent)
365{
366 const struct rpc_program *program = args->program;
367 const struct rpc_version *version;
368 struct rpc_clnt *clnt = NULL;
369 const struct rpc_timeout *timeout;
370 const char *nodename = args->nodename;
371 int err;
372
373
374 dprintk("RPC: creating %s client for %s (xprt %p)\n",
375 program->name, args->servername, xprt);
376
377 err = rpciod_up();
378 if (err)
379 goto out_no_rpciod;
380
381 err = -EINVAL;
382 if (args->version >= program->nrvers)
383 goto out_err;
384 version = program->version[args->version];
385 if (version == NULL)
386 goto out_err;
387
388 err = -ENOMEM;
389 clnt = kzalloc(sizeof(*clnt), GFP_KERNEL);
390 if (!clnt)
391 goto out_err;
392 clnt->cl_parent = parent ? : clnt;
393
394 err = rpc_alloc_clid(clnt);
395 if (err)
396 goto out_no_clid;
397
398 clnt->cl_cred = get_cred(args->cred);
399 clnt->cl_procinfo = version->procs;
400 clnt->cl_maxproc = version->nrprocs;
401 clnt->cl_prog = args->prognumber ? : program->number;
402 clnt->cl_vers = version->number;
403 clnt->cl_stats = program->stats;
404 clnt->cl_metrics = rpc_alloc_iostats(clnt);
405 rpc_init_pipe_dir_head(&clnt->cl_pipedir_objects);
406 err = -ENOMEM;
407 if (clnt->cl_metrics == NULL)
408 goto out_no_stats;
409 clnt->cl_program = program;
410 INIT_LIST_HEAD(&clnt->cl_tasks);
411 spin_lock_init(&clnt->cl_lock);
412
413 timeout = xprt->timeout;
414 if (args->timeout != NULL) {
415 memcpy(&clnt->cl_timeout_default, args->timeout,
416 sizeof(clnt->cl_timeout_default));
417 timeout = &clnt->cl_timeout_default;
418 }
419
420 rpc_clnt_set_transport(clnt, xprt, timeout);
421 xprt_iter_init(&clnt->cl_xpi, xps);
422 xprt_switch_put(xps);
423
424 clnt->cl_rtt = &clnt->cl_rtt_default;
425 rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval);
426
427 atomic_set(&clnt->cl_count, 1);
428
429 if (nodename == NULL)
430 nodename = utsname()->nodename;
431
432 rpc_clnt_set_nodename(clnt, nodename);
433
434 err = rpc_client_register(clnt, args->authflavor, args->client_name);
435 if (err)
436 goto out_no_path;
437 if (parent)
438 atomic_inc(&parent->cl_count);
439 return clnt;
440
441out_no_path:
442 rpc_free_iostats(clnt->cl_metrics);
443out_no_stats:
444 put_cred(clnt->cl_cred);
445 rpc_free_clid(clnt);
446out_no_clid:
447 kfree(clnt);
448out_err:
449 rpciod_down();
450out_no_rpciod:
451 xprt_switch_put(xps);
452 xprt_put(xprt);
453 return ERR_PTR(err);
454}
455
456static struct rpc_clnt *rpc_create_xprt(struct rpc_create_args *args,
457 struct rpc_xprt *xprt)
458{
459 struct rpc_clnt *clnt = NULL;
460 struct rpc_xprt_switch *xps;
461
462 if (args->bc_xprt && args->bc_xprt->xpt_bc_xps) {
463 WARN_ON_ONCE(!(args->protocol & XPRT_TRANSPORT_BC));
464 xps = args->bc_xprt->xpt_bc_xps;
465 xprt_switch_get(xps);
466 } else {
467 xps = xprt_switch_alloc(xprt, GFP_KERNEL);
468 if (xps == NULL) {
469 xprt_put(xprt);
470 return ERR_PTR(-ENOMEM);
471 }
472 if (xprt->bc_xprt) {
473 xprt_switch_get(xps);
474 xprt->bc_xprt->xpt_bc_xps = xps;
475 }
476 }
477 clnt = rpc_new_client(args, xps, xprt, NULL);
478 if (IS_ERR(clnt))
479 return clnt;
480
481 if (!(args->flags & RPC_CLNT_CREATE_NOPING)) {
482 int err = rpc_ping(clnt);
483 if (err != 0) {
484 rpc_shutdown_client(clnt);
485 return ERR_PTR(err);
486 }
487 }
488
489 clnt->cl_softrtry = 1;
490 if (args->flags & (RPC_CLNT_CREATE_HARDRTRY|RPC_CLNT_CREATE_SOFTERR)) {
491 clnt->cl_softrtry = 0;
492 if (args->flags & RPC_CLNT_CREATE_SOFTERR)
493 clnt->cl_softerr = 1;
494 }
495
496 if (args->flags & RPC_CLNT_CREATE_AUTOBIND)
497 clnt->cl_autobind = 1;
498 if (args->flags & RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT)
499 clnt->cl_noretranstimeo = 1;
500 if (args->flags & RPC_CLNT_CREATE_DISCRTRY)
501 clnt->cl_discrtry = 1;
502 if (!(args->flags & RPC_CLNT_CREATE_QUIET))
503 clnt->cl_chatty = 1;
504
505 return clnt;
506}
507
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510
511
512
513
514
515
516
517
518struct rpc_clnt *rpc_create(struct rpc_create_args *args)
519{
520 struct rpc_xprt *xprt;
521 struct xprt_create xprtargs = {
522 .net = args->net,
523 .ident = args->protocol,
524 .srcaddr = args->saddress,
525 .dstaddr = args->address,
526 .addrlen = args->addrsize,
527 .servername = args->servername,
528 .bc_xprt = args->bc_xprt,
529 };
530 char servername[48];
531 struct rpc_clnt *clnt;
532 int i;
533
534 if (args->bc_xprt) {
535 WARN_ON_ONCE(!(args->protocol & XPRT_TRANSPORT_BC));
536 xprt = args->bc_xprt->xpt_bc_xprt;
537 if (xprt) {
538 xprt_get(xprt);
539 return rpc_create_xprt(args, xprt);
540 }
541 }
542
543 if (args->flags & RPC_CLNT_CREATE_INFINITE_SLOTS)
544 xprtargs.flags |= XPRT_CREATE_INFINITE_SLOTS;
545 if (args->flags & RPC_CLNT_CREATE_NO_IDLE_TIMEOUT)
546 xprtargs.flags |= XPRT_CREATE_NO_IDLE_TIMEOUT;
547
548
549
550
551 if (xprtargs.servername == NULL) {
552 struct sockaddr_un *sun =
553 (struct sockaddr_un *)args->address;
554 struct sockaddr_in *sin =
555 (struct sockaddr_in *)args->address;
556 struct sockaddr_in6 *sin6 =
557 (struct sockaddr_in6 *)args->address;
558
559 servername[0] = '\0';
560 switch (args->address->sa_family) {
561 case AF_LOCAL:
562 snprintf(servername, sizeof(servername), "%s",
563 sun->sun_path);
564 break;
565 case AF_INET:
566 snprintf(servername, sizeof(servername), "%pI4",
567 &sin->sin_addr.s_addr);
568 break;
569 case AF_INET6:
570 snprintf(servername, sizeof(servername), "%pI6",
571 &sin6->sin6_addr);
572 break;
573 default:
574
575
576 return ERR_PTR(-EINVAL);
577 }
578 xprtargs.servername = servername;
579 }
580
581 xprt = xprt_create_transport(&xprtargs);
582 if (IS_ERR(xprt))
583 return (struct rpc_clnt *)xprt;
584
585
586
587
588
589
590
591 xprt->resvport = 1;
592 if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT)
593 xprt->resvport = 0;
594
595 clnt = rpc_create_xprt(args, xprt);
596 if (IS_ERR(clnt) || args->nconnect <= 1)
597 return clnt;
598
599 for (i = 0; i < args->nconnect - 1; i++) {
600 if (rpc_clnt_add_xprt(clnt, &xprtargs, NULL, NULL) < 0)
601 break;
602 }
603 return clnt;
604}
605EXPORT_SYMBOL_GPL(rpc_create);
606
607
608
609
610
611
612static struct rpc_clnt *__rpc_clone_client(struct rpc_create_args *args,
613 struct rpc_clnt *clnt)
614{
615 struct rpc_xprt_switch *xps;
616 struct rpc_xprt *xprt;
617 struct rpc_clnt *new;
618 int err;
619
620 err = -ENOMEM;
621 rcu_read_lock();
622 xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
623 xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch));
624 rcu_read_unlock();
625 if (xprt == NULL || xps == NULL) {
626 xprt_put(xprt);
627 xprt_switch_put(xps);
628 goto out_err;
629 }
630 args->servername = xprt->servername;
631 args->nodename = clnt->cl_nodename;
632
633 new = rpc_new_client(args, xps, xprt, clnt);
634 if (IS_ERR(new)) {
635 err = PTR_ERR(new);
636 goto out_err;
637 }
638
639
640 new->cl_autobind = 0;
641 new->cl_softrtry = clnt->cl_softrtry;
642 new->cl_softerr = clnt->cl_softerr;
643 new->cl_noretranstimeo = clnt->cl_noretranstimeo;
644 new->cl_discrtry = clnt->cl_discrtry;
645 new->cl_chatty = clnt->cl_chatty;
646 new->cl_principal = clnt->cl_principal;
647 return new;
648
649out_err:
650 dprintk("RPC: %s: returned error %d\n", __func__, err);
651 return ERR_PTR(err);
652}
653
654
655
656
657
658
659
660
661struct rpc_clnt *rpc_clone_client(struct rpc_clnt *clnt)
662{
663 struct rpc_create_args args = {
664 .program = clnt->cl_program,
665 .prognumber = clnt->cl_prog,
666 .version = clnt->cl_vers,
667 .authflavor = clnt->cl_auth->au_flavor,
668 .cred = clnt->cl_cred,
669 };
670 return __rpc_clone_client(&args, clnt);
671}
672EXPORT_SYMBOL_GPL(rpc_clone_client);
673
674
675
676
677
678
679
680
681
682struct rpc_clnt *
683rpc_clone_client_set_auth(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
684{
685 struct rpc_create_args args = {
686 .program = clnt->cl_program,
687 .prognumber = clnt->cl_prog,
688 .version = clnt->cl_vers,
689 .authflavor = flavor,
690 .cred = clnt->cl_cred,
691 };
692 return __rpc_clone_client(&args, clnt);
693}
694EXPORT_SYMBOL_GPL(rpc_clone_client_set_auth);
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711int rpc_switch_client_transport(struct rpc_clnt *clnt,
712 struct xprt_create *args,
713 const struct rpc_timeout *timeout)
714{
715 const struct rpc_timeout *old_timeo;
716 rpc_authflavor_t pseudoflavor;
717 struct rpc_xprt_switch *xps, *oldxps;
718 struct rpc_xprt *xprt, *old;
719 struct rpc_clnt *parent;
720 int err;
721
722 xprt = xprt_create_transport(args);
723 if (IS_ERR(xprt)) {
724 dprintk("RPC: failed to create new xprt for clnt %p\n",
725 clnt);
726 return PTR_ERR(xprt);
727 }
728
729 xps = xprt_switch_alloc(xprt, GFP_KERNEL);
730 if (xps == NULL) {
731 xprt_put(xprt);
732 return -ENOMEM;
733 }
734
735 pseudoflavor = clnt->cl_auth->au_flavor;
736
737 old_timeo = clnt->cl_timeout;
738 old = rpc_clnt_set_transport(clnt, xprt, timeout);
739 oldxps = xprt_iter_xchg_switch(&clnt->cl_xpi, xps);
740
741 rpc_unregister_client(clnt);
742 __rpc_clnt_remove_pipedir(clnt);
743 rpc_clnt_debugfs_unregister(clnt);
744
745
746
747
748
749
750 parent = clnt->cl_parent;
751 clnt->cl_parent = clnt;
752
753
754
755
756
757
758 err = rpc_client_register(clnt, pseudoflavor, NULL);
759 if (err)
760 goto out_revert;
761
762 synchronize_rcu();
763 if (parent != clnt)
764 rpc_release_client(parent);
765 xprt_switch_put(oldxps);
766 xprt_put(old);
767 dprintk("RPC: replaced xprt for clnt %p\n", clnt);
768 return 0;
769
770out_revert:
771 xps = xprt_iter_xchg_switch(&clnt->cl_xpi, oldxps);
772 rpc_clnt_set_transport(clnt, old, old_timeo);
773 clnt->cl_parent = parent;
774 rpc_client_register(clnt, pseudoflavor, NULL);
775 xprt_switch_put(xps);
776 xprt_put(xprt);
777 dprintk("RPC: failed to switch xprt for clnt %p\n", clnt);
778 return err;
779}
780EXPORT_SYMBOL_GPL(rpc_switch_client_transport);
781
782static
783int rpc_clnt_xprt_iter_init(struct rpc_clnt *clnt, struct rpc_xprt_iter *xpi)
784{
785 struct rpc_xprt_switch *xps;
786
787 rcu_read_lock();
788 xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch));
789 rcu_read_unlock();
790 if (xps == NULL)
791 return -EAGAIN;
792 xprt_iter_init_listall(xpi, xps);
793 xprt_switch_put(xps);
794 return 0;
795}
796
797
798
799
800
801
802
803
804
805
806
807
808int rpc_clnt_iterate_for_each_xprt(struct rpc_clnt *clnt,
809 int (*fn)(struct rpc_clnt *, struct rpc_xprt *, void *),
810 void *data)
811{
812 struct rpc_xprt_iter xpi;
813 int ret;
814
815 ret = rpc_clnt_xprt_iter_init(clnt, &xpi);
816 if (ret)
817 return ret;
818 for (;;) {
819 struct rpc_xprt *xprt = xprt_iter_get_next(&xpi);
820
821 if (!xprt)
822 break;
823 ret = fn(clnt, xprt, data);
824 xprt_put(xprt);
825 if (ret < 0)
826 break;
827 }
828 xprt_iter_destroy(&xpi);
829 return ret;
830}
831EXPORT_SYMBOL_GPL(rpc_clnt_iterate_for_each_xprt);
832
833
834
835
836
837void rpc_killall_tasks(struct rpc_clnt *clnt)
838{
839 struct rpc_task *rovr;
840
841
842 if (list_empty(&clnt->cl_tasks))
843 return;
844 dprintk("RPC: killing all tasks for client %p\n", clnt);
845
846
847
848 spin_lock(&clnt->cl_lock);
849 list_for_each_entry(rovr, &clnt->cl_tasks, tk_task)
850 rpc_signal_task(rovr);
851 spin_unlock(&clnt->cl_lock);
852}
853EXPORT_SYMBOL_GPL(rpc_killall_tasks);
854
855
856
857
858
859void rpc_shutdown_client(struct rpc_clnt *clnt)
860{
861 might_sleep();
862
863 dprintk_rcu("RPC: shutting down %s client for %s\n",
864 clnt->cl_program->name,
865 rcu_dereference(clnt->cl_xprt)->servername);
866
867 while (!list_empty(&clnt->cl_tasks)) {
868 rpc_killall_tasks(clnt);
869 wait_event_timeout(destroy_wait,
870 list_empty(&clnt->cl_tasks), 1*HZ);
871 }
872
873 rpc_release_client(clnt);
874}
875EXPORT_SYMBOL_GPL(rpc_shutdown_client);
876
877
878
879
880static struct rpc_clnt *
881rpc_free_client(struct rpc_clnt *clnt)
882{
883 struct rpc_clnt *parent = NULL;
884
885 dprintk_rcu("RPC: destroying %s client for %s\n",
886 clnt->cl_program->name,
887 rcu_dereference(clnt->cl_xprt)->servername);
888 if (clnt->cl_parent != clnt)
889 parent = clnt->cl_parent;
890 rpc_clnt_debugfs_unregister(clnt);
891 rpc_clnt_remove_pipedir(clnt);
892 rpc_unregister_client(clnt);
893 rpc_free_iostats(clnt->cl_metrics);
894 clnt->cl_metrics = NULL;
895 xprt_put(rcu_dereference_raw(clnt->cl_xprt));
896 xprt_iter_destroy(&clnt->cl_xpi);
897 rpciod_down();
898 put_cred(clnt->cl_cred);
899 rpc_free_clid(clnt);
900 kfree(clnt);
901 return parent;
902}
903
904
905
906
907static struct rpc_clnt *
908rpc_free_auth(struct rpc_clnt *clnt)
909{
910 if (clnt->cl_auth == NULL)
911 return rpc_free_client(clnt);
912
913
914
915
916
917
918 atomic_inc(&clnt->cl_count);
919 rpcauth_release(clnt->cl_auth);
920 clnt->cl_auth = NULL;
921 if (atomic_dec_and_test(&clnt->cl_count))
922 return rpc_free_client(clnt);
923 return NULL;
924}
925
926
927
928
929void
930rpc_release_client(struct rpc_clnt *clnt)
931{
932 dprintk("RPC: rpc_release_client(%p)\n", clnt);
933
934 do {
935 if (list_empty(&clnt->cl_tasks))
936 wake_up(&destroy_wait);
937 if (!atomic_dec_and_test(&clnt->cl_count))
938 break;
939 clnt = rpc_free_auth(clnt);
940 } while (clnt != NULL);
941}
942EXPORT_SYMBOL_GPL(rpc_release_client);
943
944
945
946
947
948
949
950
951
952
953
954struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old,
955 const struct rpc_program *program,
956 u32 vers)
957{
958 struct rpc_create_args args = {
959 .program = program,
960 .prognumber = program->number,
961 .version = vers,
962 .authflavor = old->cl_auth->au_flavor,
963 .cred = old->cl_cred,
964 };
965 struct rpc_clnt *clnt;
966 int err;
967
968 clnt = __rpc_clone_client(&args, old);
969 if (IS_ERR(clnt))
970 goto out;
971 err = rpc_ping(clnt);
972 if (err != 0) {
973 rpc_shutdown_client(clnt);
974 clnt = ERR_PTR(err);
975 }
976out:
977 return clnt;
978}
979EXPORT_SYMBOL_GPL(rpc_bind_new_program);
980
981struct rpc_xprt *
982rpc_task_get_xprt(struct rpc_clnt *clnt, struct rpc_xprt *xprt)
983{
984 struct rpc_xprt_switch *xps;
985
986 if (!xprt)
987 return NULL;
988 rcu_read_lock();
989 xps = rcu_dereference(clnt->cl_xpi.xpi_xpswitch);
990 atomic_long_inc(&xps->xps_queuelen);
991 rcu_read_unlock();
992 atomic_long_inc(&xprt->queuelen);
993
994 return xprt;
995}
996
997static void
998rpc_task_release_xprt(struct rpc_clnt *clnt, struct rpc_xprt *xprt)
999{
1000 struct rpc_xprt_switch *xps;
1001
1002 atomic_long_dec(&xprt->queuelen);
1003 rcu_read_lock();
1004 xps = rcu_dereference(clnt->cl_xpi.xpi_xpswitch);
1005 atomic_long_dec(&xps->xps_queuelen);
1006 rcu_read_unlock();
1007
1008 xprt_put(xprt);
1009}
1010
1011void rpc_task_release_transport(struct rpc_task *task)
1012{
1013 struct rpc_xprt *xprt = task->tk_xprt;
1014
1015 if (xprt) {
1016 task->tk_xprt = NULL;
1017 if (task->tk_client)
1018 rpc_task_release_xprt(task->tk_client, xprt);
1019 else
1020 xprt_put(xprt);
1021 }
1022}
1023EXPORT_SYMBOL_GPL(rpc_task_release_transport);
1024
1025void rpc_task_release_client(struct rpc_task *task)
1026{
1027 struct rpc_clnt *clnt = task->tk_client;
1028
1029 rpc_task_release_transport(task);
1030 if (clnt != NULL) {
1031
1032 spin_lock(&clnt->cl_lock);
1033 list_del(&task->tk_task);
1034 spin_unlock(&clnt->cl_lock);
1035 task->tk_client = NULL;
1036
1037 rpc_release_client(clnt);
1038 }
1039}
1040
1041static struct rpc_xprt *
1042rpc_task_get_first_xprt(struct rpc_clnt *clnt)
1043{
1044 struct rpc_xprt *xprt;
1045
1046 rcu_read_lock();
1047 xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
1048 rcu_read_unlock();
1049 return rpc_task_get_xprt(clnt, xprt);
1050}
1051
1052static struct rpc_xprt *
1053rpc_task_get_next_xprt(struct rpc_clnt *clnt)
1054{
1055 return rpc_task_get_xprt(clnt, xprt_iter_get_next(&clnt->cl_xpi));
1056}
1057
1058static
1059void rpc_task_set_transport(struct rpc_task *task, struct rpc_clnt *clnt)
1060{
1061 if (task->tk_xprt)
1062 return;
1063 if (task->tk_flags & RPC_TASK_NO_ROUND_ROBIN)
1064 task->tk_xprt = rpc_task_get_first_xprt(clnt);
1065 else
1066 task->tk_xprt = rpc_task_get_next_xprt(clnt);
1067}
1068
1069static
1070void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt)
1071{
1072
1073 if (clnt != NULL) {
1074 rpc_task_set_transport(task, clnt);
1075 task->tk_client = clnt;
1076 atomic_inc(&clnt->cl_count);
1077 if (clnt->cl_softrtry)
1078 task->tk_flags |= RPC_TASK_SOFT;
1079 if (clnt->cl_softerr)
1080 task->tk_flags |= RPC_TASK_TIMEOUT;
1081 if (clnt->cl_noretranstimeo)
1082 task->tk_flags |= RPC_TASK_NO_RETRANS_TIMEOUT;
1083 if (atomic_read(&clnt->cl_swapper))
1084 task->tk_flags |= RPC_TASK_SWAPPER;
1085
1086 spin_lock(&clnt->cl_lock);
1087 list_add_tail(&task->tk_task, &clnt->cl_tasks);
1088 spin_unlock(&clnt->cl_lock);
1089 }
1090}
1091
1092static void
1093rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg)
1094{
1095 if (msg != NULL) {
1096 task->tk_msg.rpc_proc = msg->rpc_proc;
1097 task->tk_msg.rpc_argp = msg->rpc_argp;
1098 task->tk_msg.rpc_resp = msg->rpc_resp;
1099 if (msg->rpc_cred != NULL)
1100 task->tk_msg.rpc_cred = get_cred(msg->rpc_cred);
1101 }
1102}
1103
1104
1105
1106
1107static void
1108rpc_default_callback(struct rpc_task *task, void *data)
1109{
1110}
1111
1112static const struct rpc_call_ops rpc_default_ops = {
1113 .rpc_call_done = rpc_default_callback,
1114};
1115
1116
1117
1118
1119
1120struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data)
1121{
1122 struct rpc_task *task;
1123
1124 task = rpc_new_task(task_setup_data);
1125
1126 rpc_task_set_client(task, task_setup_data->rpc_client);
1127 rpc_task_set_rpc_message(task, task_setup_data->rpc_message);
1128
1129 if (task->tk_action == NULL)
1130 rpc_call_start(task);
1131
1132 atomic_inc(&task->tk_count);
1133 rpc_execute(task);
1134 return task;
1135}
1136EXPORT_SYMBOL_GPL(rpc_run_task);
1137
1138
1139
1140
1141
1142
1143
1144int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags)
1145{
1146 struct rpc_task *task;
1147 struct rpc_task_setup task_setup_data = {
1148 .rpc_client = clnt,
1149 .rpc_message = msg,
1150 .callback_ops = &rpc_default_ops,
1151 .flags = flags,
1152 };
1153 int status;
1154
1155 WARN_ON_ONCE(flags & RPC_TASK_ASYNC);
1156 if (flags & RPC_TASK_ASYNC) {
1157 rpc_release_calldata(task_setup_data.callback_ops,
1158 task_setup_data.callback_data);
1159 return -EINVAL;
1160 }
1161
1162 task = rpc_run_task(&task_setup_data);
1163 if (IS_ERR(task))
1164 return PTR_ERR(task);
1165 status = task->tk_status;
1166 rpc_put_task(task);
1167 return status;
1168}
1169EXPORT_SYMBOL_GPL(rpc_call_sync);
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179int
1180rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags,
1181 const struct rpc_call_ops *tk_ops, void *data)
1182{
1183 struct rpc_task *task;
1184 struct rpc_task_setup task_setup_data = {
1185 .rpc_client = clnt,
1186 .rpc_message = msg,
1187 .callback_ops = tk_ops,
1188 .callback_data = data,
1189 .flags = flags|RPC_TASK_ASYNC,
1190 };
1191
1192 task = rpc_run_task(&task_setup_data);
1193 if (IS_ERR(task))
1194 return PTR_ERR(task);
1195 rpc_put_task(task);
1196 return 0;
1197}
1198EXPORT_SYMBOL_GPL(rpc_call_async);
1199
1200#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1201static void call_bc_encode(struct rpc_task *task);
1202
1203
1204
1205
1206
1207
1208struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req)
1209{
1210 struct rpc_task *task;
1211 struct rpc_task_setup task_setup_data = {
1212 .callback_ops = &rpc_default_ops,
1213 .flags = RPC_TASK_SOFTCONN |
1214 RPC_TASK_NO_RETRANS_TIMEOUT,
1215 };
1216
1217 dprintk("RPC: rpc_run_bc_task req= %p\n", req);
1218
1219
1220
1221 task = rpc_new_task(&task_setup_data);
1222 xprt_init_bc_request(req, task);
1223
1224 task->tk_action = call_bc_encode;
1225 atomic_inc(&task->tk_count);
1226 WARN_ON_ONCE(atomic_read(&task->tk_count) != 2);
1227 rpc_execute(task);
1228
1229 dprintk("RPC: rpc_run_bc_task: task= %p\n", task);
1230 return task;
1231}
1232#endif
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243void rpc_prepare_reply_pages(struct rpc_rqst *req, struct page **pages,
1244 unsigned int base, unsigned int len,
1245 unsigned int hdrsize)
1246{
1247
1248
1249
1250 hdrsize += RPC_REPHDRSIZE + req->rq_cred->cr_auth->au_ralign - 1;
1251
1252 xdr_inline_pages(&req->rq_rcv_buf, hdrsize << 2, pages, base, len);
1253 trace_rpc_reply_pages(req);
1254}
1255EXPORT_SYMBOL_GPL(rpc_prepare_reply_pages);
1256
1257void
1258rpc_call_start(struct rpc_task *task)
1259{
1260 task->tk_action = call_start;
1261}
1262EXPORT_SYMBOL_GPL(rpc_call_start);
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize)
1273{
1274 size_t bytes;
1275 struct rpc_xprt *xprt;
1276
1277 rcu_read_lock();
1278 xprt = rcu_dereference(clnt->cl_xprt);
1279
1280 bytes = xprt->addrlen;
1281 if (bytes > bufsize)
1282 bytes = bufsize;
1283 memcpy(buf, &xprt->addr, bytes);
1284 rcu_read_unlock();
1285
1286 return bytes;
1287}
1288EXPORT_SYMBOL_GPL(rpc_peeraddr);
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299const char *rpc_peeraddr2str(struct rpc_clnt *clnt,
1300 enum rpc_display_format_t format)
1301{
1302 struct rpc_xprt *xprt;
1303
1304 xprt = rcu_dereference(clnt->cl_xprt);
1305
1306 if (xprt->address_strings[format] != NULL)
1307 return xprt->address_strings[format];
1308 else
1309 return "unprintable";
1310}
1311EXPORT_SYMBOL_GPL(rpc_peeraddr2str);
1312
1313static const struct sockaddr_in rpc_inaddr_loopback = {
1314 .sin_family = AF_INET,
1315 .sin_addr.s_addr = htonl(INADDR_ANY),
1316};
1317
1318static const struct sockaddr_in6 rpc_in6addr_loopback = {
1319 .sin6_family = AF_INET6,
1320 .sin6_addr = IN6ADDR_ANY_INIT,
1321};
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331static int rpc_sockname(struct net *net, struct sockaddr *sap, size_t salen,
1332 struct sockaddr *buf)
1333{
1334 struct socket *sock;
1335 int err;
1336
1337 err = __sock_create(net, sap->sa_family,
1338 SOCK_DGRAM, IPPROTO_UDP, &sock, 1);
1339 if (err < 0) {
1340 dprintk("RPC: can't create UDP socket (%d)\n", err);
1341 goto out;
1342 }
1343
1344 switch (sap->sa_family) {
1345 case AF_INET:
1346 err = kernel_bind(sock,
1347 (struct sockaddr *)&rpc_inaddr_loopback,
1348 sizeof(rpc_inaddr_loopback));
1349 break;
1350 case AF_INET6:
1351 err = kernel_bind(sock,
1352 (struct sockaddr *)&rpc_in6addr_loopback,
1353 sizeof(rpc_in6addr_loopback));
1354 break;
1355 default:
1356 err = -EAFNOSUPPORT;
1357 goto out;
1358 }
1359 if (err < 0) {
1360 dprintk("RPC: can't bind UDP socket (%d)\n", err);
1361 goto out_release;
1362 }
1363
1364 err = kernel_connect(sock, sap, salen, 0);
1365 if (err < 0) {
1366 dprintk("RPC: can't connect UDP socket (%d)\n", err);
1367 goto out_release;
1368 }
1369
1370 err = kernel_getsockname(sock, buf);
1371 if (err < 0) {
1372 dprintk("RPC: getsockname failed (%d)\n", err);
1373 goto out_release;
1374 }
1375
1376 err = 0;
1377 if (buf->sa_family == AF_INET6) {
1378 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)buf;
1379 sin6->sin6_scope_id = 0;
1380 }
1381 dprintk("RPC: %s succeeded\n", __func__);
1382
1383out_release:
1384 sock_release(sock);
1385out:
1386 return err;
1387}
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397static int rpc_anyaddr(int family, struct sockaddr *buf, size_t buflen)
1398{
1399 switch (family) {
1400 case AF_INET:
1401 if (buflen < sizeof(rpc_inaddr_loopback))
1402 return -EINVAL;
1403 memcpy(buf, &rpc_inaddr_loopback,
1404 sizeof(rpc_inaddr_loopback));
1405 break;
1406 case AF_INET6:
1407 if (buflen < sizeof(rpc_in6addr_loopback))
1408 return -EINVAL;
1409 memcpy(buf, &rpc_in6addr_loopback,
1410 sizeof(rpc_in6addr_loopback));
1411 break;
1412 default:
1413 dprintk("RPC: %s: address family not supported\n",
1414 __func__);
1415 return -EAFNOSUPPORT;
1416 }
1417 dprintk("RPC: %s: succeeded\n", __func__);
1418 return 0;
1419}
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437int rpc_localaddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t buflen)
1438{
1439 struct sockaddr_storage address;
1440 struct sockaddr *sap = (struct sockaddr *)&address;
1441 struct rpc_xprt *xprt;
1442 struct net *net;
1443 size_t salen;
1444 int err;
1445
1446 rcu_read_lock();
1447 xprt = rcu_dereference(clnt->cl_xprt);
1448 salen = xprt->addrlen;
1449 memcpy(sap, &xprt->addr, salen);
1450 net = get_net(xprt->xprt_net);
1451 rcu_read_unlock();
1452
1453 rpc_set_port(sap, 0);
1454 err = rpc_sockname(net, sap, salen, buf);
1455 put_net(net);
1456 if (err != 0)
1457
1458 return rpc_anyaddr(sap->sa_family, buf, buflen);
1459 return 0;
1460}
1461EXPORT_SYMBOL_GPL(rpc_localaddr);
1462
1463void
1464rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize)
1465{
1466 struct rpc_xprt *xprt;
1467
1468 rcu_read_lock();
1469 xprt = rcu_dereference(clnt->cl_xprt);
1470 if (xprt->ops->set_buffer_size)
1471 xprt->ops->set_buffer_size(xprt, sndsize, rcvsize);
1472 rcu_read_unlock();
1473}
1474EXPORT_SYMBOL_GPL(rpc_setbufsize);
1475
1476
1477
1478
1479
1480
1481struct net *rpc_net_ns(struct rpc_clnt *clnt)
1482{
1483 struct net *ret;
1484
1485 rcu_read_lock();
1486 ret = rcu_dereference(clnt->cl_xprt)->xprt_net;
1487 rcu_read_unlock();
1488 return ret;
1489}
1490EXPORT_SYMBOL_GPL(rpc_net_ns);
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501size_t rpc_max_payload(struct rpc_clnt *clnt)
1502{
1503 size_t ret;
1504
1505 rcu_read_lock();
1506 ret = rcu_dereference(clnt->cl_xprt)->max_payload;
1507 rcu_read_unlock();
1508 return ret;
1509}
1510EXPORT_SYMBOL_GPL(rpc_max_payload);
1511
1512
1513
1514
1515
1516size_t rpc_max_bc_payload(struct rpc_clnt *clnt)
1517{
1518 struct rpc_xprt *xprt;
1519 size_t ret;
1520
1521 rcu_read_lock();
1522 xprt = rcu_dereference(clnt->cl_xprt);
1523 ret = xprt->ops->bc_maxpayload(xprt);
1524 rcu_read_unlock();
1525 return ret;
1526}
1527EXPORT_SYMBOL_GPL(rpc_max_bc_payload);
1528
1529unsigned int rpc_num_bc_slots(struct rpc_clnt *clnt)
1530{
1531 struct rpc_xprt *xprt;
1532 unsigned int ret;
1533
1534 rcu_read_lock();
1535 xprt = rcu_dereference(clnt->cl_xprt);
1536 ret = xprt->ops->bc_num_slots(xprt);
1537 rcu_read_unlock();
1538 return ret;
1539}
1540EXPORT_SYMBOL_GPL(rpc_num_bc_slots);
1541
1542
1543
1544
1545
1546
1547void rpc_force_rebind(struct rpc_clnt *clnt)
1548{
1549 if (clnt->cl_autobind) {
1550 rcu_read_lock();
1551 xprt_clear_bound(rcu_dereference(clnt->cl_xprt));
1552 rcu_read_unlock();
1553 }
1554}
1555EXPORT_SYMBOL_GPL(rpc_force_rebind);
1556
1557static int
1558__rpc_restart_call(struct rpc_task *task, void (*action)(struct rpc_task *))
1559{
1560 task->tk_status = 0;
1561 task->tk_rpc_status = 0;
1562 task->tk_action = action;
1563 return 1;
1564}
1565
1566
1567
1568
1569
1570int
1571rpc_restart_call(struct rpc_task *task)
1572{
1573 return __rpc_restart_call(task, call_start);
1574}
1575EXPORT_SYMBOL_GPL(rpc_restart_call);
1576
1577
1578
1579
1580
1581int
1582rpc_restart_call_prepare(struct rpc_task *task)
1583{
1584 if (task->tk_ops->rpc_call_prepare != NULL)
1585 return __rpc_restart_call(task, rpc_prepare_task);
1586 return rpc_restart_call(task);
1587}
1588EXPORT_SYMBOL_GPL(rpc_restart_call_prepare);
1589
1590const char
1591*rpc_proc_name(const struct rpc_task *task)
1592{
1593 const struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
1594
1595 if (proc) {
1596 if (proc->p_name)
1597 return proc->p_name;
1598 else
1599 return "NULL";
1600 } else
1601 return "no proc";
1602}
1603
1604static void
1605__rpc_call_rpcerror(struct rpc_task *task, int tk_status, int rpc_status)
1606{
1607 task->tk_rpc_status = rpc_status;
1608 rpc_exit(task, tk_status);
1609}
1610
1611static void
1612rpc_call_rpcerror(struct rpc_task *task, int status)
1613{
1614 __rpc_call_rpcerror(task, status, status);
1615}
1616
1617
1618
1619
1620
1621
1622
1623static void
1624call_start(struct rpc_task *task)
1625{
1626 struct rpc_clnt *clnt = task->tk_client;
1627 int idx = task->tk_msg.rpc_proc->p_statidx;
1628
1629 trace_rpc_request(task);
1630 dprintk("RPC: %5u call_start %s%d proc %s (%s)\n", task->tk_pid,
1631 clnt->cl_program->name, clnt->cl_vers,
1632 rpc_proc_name(task),
1633 (RPC_IS_ASYNC(task) ? "async" : "sync"));
1634
1635
1636 if (clnt->cl_program->version[clnt->cl_vers])
1637 clnt->cl_program->version[clnt->cl_vers]->counts[idx]++;
1638 clnt->cl_stats->rpccnt++;
1639 task->tk_action = call_reserve;
1640 rpc_task_set_transport(task, clnt);
1641}
1642
1643
1644
1645
1646static void
1647call_reserve(struct rpc_task *task)
1648{
1649 dprint_status(task);
1650
1651 task->tk_status = 0;
1652 task->tk_action = call_reserveresult;
1653 xprt_reserve(task);
1654}
1655
1656static void call_retry_reserve(struct rpc_task *task);
1657
1658
1659
1660
1661static void
1662call_reserveresult(struct rpc_task *task)
1663{
1664 int status = task->tk_status;
1665
1666 dprint_status(task);
1667
1668
1669
1670
1671
1672 task->tk_status = 0;
1673 if (status >= 0) {
1674 if (task->tk_rqstp) {
1675 task->tk_action = call_refresh;
1676 return;
1677 }
1678
1679 printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n",
1680 __func__, status);
1681 rpc_call_rpcerror(task, -EIO);
1682 return;
1683 }
1684
1685
1686
1687
1688
1689 if (task->tk_rqstp) {
1690 printk(KERN_ERR "%s: status=%d, request allocated anyway\n",
1691 __func__, status);
1692 xprt_release(task);
1693 }
1694
1695 switch (status) {
1696 case -ENOMEM:
1697 rpc_delay(task, HZ >> 2);
1698
1699 case -EAGAIN:
1700 task->tk_action = call_retry_reserve;
1701 return;
1702 case -EIO:
1703 break;
1704 default:
1705 printk(KERN_ERR "%s: unrecognized error %d, exiting\n",
1706 __func__, status);
1707 break;
1708 }
1709 rpc_call_rpcerror(task, status);
1710}
1711
1712
1713
1714
1715static void
1716call_retry_reserve(struct rpc_task *task)
1717{
1718 dprint_status(task);
1719
1720 task->tk_status = 0;
1721 task->tk_action = call_reserveresult;
1722 xprt_retry_reserve(task);
1723}
1724
1725
1726
1727
1728static void
1729call_refresh(struct rpc_task *task)
1730{
1731 dprint_status(task);
1732
1733 task->tk_action = call_refreshresult;
1734 task->tk_status = 0;
1735 task->tk_client->cl_stats->rpcauthrefresh++;
1736 rpcauth_refreshcred(task);
1737}
1738
1739
1740
1741
1742static void
1743call_refreshresult(struct rpc_task *task)
1744{
1745 int status = task->tk_status;
1746
1747 dprint_status(task);
1748
1749 task->tk_status = 0;
1750 task->tk_action = call_refresh;
1751 switch (status) {
1752 case 0:
1753 if (rpcauth_uptodatecred(task)) {
1754 task->tk_action = call_allocate;
1755 return;
1756 }
1757
1758
1759
1760
1761 case -ETIMEDOUT:
1762 rpc_delay(task, 3*HZ);
1763
1764 case -EAGAIN:
1765 status = -EACCES;
1766
1767 case -EKEYEXPIRED:
1768 if (!task->tk_cred_retry)
1769 break;
1770 task->tk_cred_retry--;
1771 dprintk("RPC: %5u %s: retry refresh creds\n",
1772 task->tk_pid, __func__);
1773 return;
1774 }
1775 dprintk("RPC: %5u %s: refresh creds failed with error %d\n",
1776 task->tk_pid, __func__, status);
1777 rpc_call_rpcerror(task, status);
1778}
1779
1780
1781
1782
1783
1784static void
1785call_allocate(struct rpc_task *task)
1786{
1787 const struct rpc_auth *auth = task->tk_rqstp->rq_cred->cr_auth;
1788 struct rpc_rqst *req = task->tk_rqstp;
1789 struct rpc_xprt *xprt = req->rq_xprt;
1790 const struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
1791 int status;
1792
1793 dprint_status(task);
1794
1795 task->tk_status = 0;
1796 task->tk_action = call_encode;
1797
1798 if (req->rq_buffer)
1799 return;
1800
1801 if (proc->p_proc != 0) {
1802 BUG_ON(proc->p_arglen == 0);
1803 if (proc->p_decode != NULL)
1804 BUG_ON(proc->p_replen == 0);
1805 }
1806
1807
1808
1809
1810
1811
1812 req->rq_callsize = RPC_CALLHDRSIZE + (auth->au_cslack << 1) +
1813 proc->p_arglen;
1814 req->rq_callsize <<= 2;
1815
1816
1817
1818
1819 req->rq_rcvsize = RPC_REPHDRSIZE + auth->au_rslack + \
1820 max_t(size_t, proc->p_replen, 2);
1821 req->rq_rcvsize <<= 2;
1822
1823 status = xprt->ops->buf_alloc(task);
1824 xprt_inject_disconnect(xprt);
1825 if (status == 0)
1826 return;
1827 if (status != -ENOMEM) {
1828 rpc_call_rpcerror(task, status);
1829 return;
1830 }
1831
1832 dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid);
1833
1834 if (RPC_IS_ASYNC(task) || !fatal_signal_pending(current)) {
1835 task->tk_action = call_allocate;
1836 rpc_delay(task, HZ>>4);
1837 return;
1838 }
1839
1840 rpc_exit(task, -ERESTARTSYS);
1841}
1842
1843static int
1844rpc_task_need_encode(struct rpc_task *task)
1845{
1846 return test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate) == 0 &&
1847 (!(task->tk_flags & RPC_TASK_SENT) ||
1848 !(task->tk_flags & RPC_TASK_NO_RETRANS_TIMEOUT) ||
1849 xprt_request_need_retransmit(task));
1850}
1851
1852static void
1853rpc_xdr_encode(struct rpc_task *task)
1854{
1855 struct rpc_rqst *req = task->tk_rqstp;
1856 struct xdr_stream xdr;
1857
1858 xdr_buf_init(&req->rq_snd_buf,
1859 req->rq_buffer,
1860 req->rq_callsize);
1861 xdr_buf_init(&req->rq_rcv_buf,
1862 req->rq_rbuffer,
1863 req->rq_rcvsize);
1864
1865 req->rq_snd_buf.head[0].iov_len = 0;
1866 xdr_init_encode(&xdr, &req->rq_snd_buf,
1867 req->rq_snd_buf.head[0].iov_base, req);
1868 xdr_free_bvec(&req->rq_snd_buf);
1869 if (rpc_encode_header(task, &xdr))
1870 return;
1871
1872 task->tk_status = rpcauth_wrap_req(task, &xdr);
1873}
1874
1875
1876
1877
1878static void
1879call_encode(struct rpc_task *task)
1880{
1881 if (!rpc_task_need_encode(task))
1882 goto out;
1883 dprint_status(task);
1884
1885 rpc_xdr_encode(task);
1886
1887 if (task->tk_status != 0) {
1888
1889 switch (task->tk_status) {
1890 case -EAGAIN:
1891 case -ENOMEM:
1892 rpc_delay(task, HZ >> 4);
1893 break;
1894 case -EKEYEXPIRED:
1895 if (!task->tk_cred_retry) {
1896 rpc_exit(task, task->tk_status);
1897 } else {
1898 task->tk_action = call_refresh;
1899 task->tk_cred_retry--;
1900 dprintk("RPC: %5u %s: retry refresh creds\n",
1901 task->tk_pid, __func__);
1902 }
1903 break;
1904 default:
1905 rpc_call_rpcerror(task, task->tk_status);
1906 }
1907 return;
1908 }
1909
1910
1911 if (rpc_reply_expected(task))
1912 xprt_request_enqueue_receive(task);
1913 xprt_request_enqueue_transmit(task);
1914out:
1915 task->tk_action = call_transmit;
1916
1917 if (!xprt_bound(task->tk_xprt))
1918 task->tk_action = call_bind;
1919 else if (!xprt_connected(task->tk_xprt))
1920 task->tk_action = call_connect;
1921}
1922
1923
1924
1925
1926
1927static bool
1928rpc_task_transmitted(struct rpc_task *task)
1929{
1930 return !test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate);
1931}
1932
1933static void
1934rpc_task_handle_transmitted(struct rpc_task *task)
1935{
1936 xprt_end_transmit(task);
1937 task->tk_action = call_transmit_status;
1938}
1939
1940
1941
1942
1943static void
1944call_bind(struct rpc_task *task)
1945{
1946 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
1947
1948 if (rpc_task_transmitted(task)) {
1949 rpc_task_handle_transmitted(task);
1950 return;
1951 }
1952
1953 if (xprt_bound(xprt)) {
1954 task->tk_action = call_connect;
1955 return;
1956 }
1957
1958 dprint_status(task);
1959
1960 task->tk_action = call_bind_status;
1961 if (!xprt_prepare_transmit(task))
1962 return;
1963
1964 xprt->ops->rpcbind(task);
1965}
1966
1967
1968
1969
1970static void
1971call_bind_status(struct rpc_task *task)
1972{
1973 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
1974 int status = -EIO;
1975
1976 if (rpc_task_transmitted(task)) {
1977 rpc_task_handle_transmitted(task);
1978 return;
1979 }
1980
1981 dprint_status(task);
1982 trace_rpc_bind_status(task);
1983 if (task->tk_status >= 0)
1984 goto out_next;
1985 if (xprt_bound(xprt)) {
1986 task->tk_status = 0;
1987 goto out_next;
1988 }
1989
1990 switch (task->tk_status) {
1991 case -ENOMEM:
1992 dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid);
1993 rpc_delay(task, HZ >> 2);
1994 goto retry_timeout;
1995 case -EACCES:
1996 dprintk("RPC: %5u remote rpcbind: RPC program/version "
1997 "unavailable\n", task->tk_pid);
1998
1999 if (task->tk_msg.rpc_proc->p_proc == 0) {
2000 status = -EOPNOTSUPP;
2001 break;
2002 }
2003 if (task->tk_rebind_retry == 0)
2004 break;
2005 task->tk_rebind_retry--;
2006 rpc_delay(task, 3*HZ);
2007 goto retry_timeout;
2008 case -ENOBUFS:
2009 rpc_delay(task, HZ >> 2);
2010 goto retry_timeout;
2011 case -EAGAIN:
2012 goto retry_timeout;
2013 case -ETIMEDOUT:
2014 dprintk("RPC: %5u rpcbind request timed out\n",
2015 task->tk_pid);
2016 goto retry_timeout;
2017 case -EPFNOSUPPORT:
2018
2019 dprintk("RPC: %5u unrecognized remote rpcbind service\n",
2020 task->tk_pid);
2021 break;
2022 case -EPROTONOSUPPORT:
2023 dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n",
2024 task->tk_pid);
2025 goto retry_timeout;
2026 case -ECONNREFUSED:
2027 case -ECONNRESET:
2028 case -ECONNABORTED:
2029 case -ENOTCONN:
2030 case -EHOSTDOWN:
2031 case -ENETDOWN:
2032 case -EHOSTUNREACH:
2033 case -ENETUNREACH:
2034 case -EPIPE:
2035 dprintk("RPC: %5u remote rpcbind unreachable: %d\n",
2036 task->tk_pid, task->tk_status);
2037 if (!RPC_IS_SOFTCONN(task)) {
2038 rpc_delay(task, 5*HZ);
2039 goto retry_timeout;
2040 }
2041 status = task->tk_status;
2042 break;
2043 default:
2044 dprintk("RPC: %5u unrecognized rpcbind error (%d)\n",
2045 task->tk_pid, -task->tk_status);
2046 }
2047
2048 rpc_call_rpcerror(task, status);
2049 return;
2050out_next:
2051 task->tk_action = call_connect;
2052 return;
2053retry_timeout:
2054 task->tk_status = 0;
2055 task->tk_action = call_bind;
2056 rpc_check_timeout(task);
2057}
2058
2059
2060
2061
2062static void
2063call_connect(struct rpc_task *task)
2064{
2065 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
2066
2067 if (rpc_task_transmitted(task)) {
2068 rpc_task_handle_transmitted(task);
2069 return;
2070 }
2071
2072 if (xprt_connected(xprt)) {
2073 task->tk_action = call_transmit;
2074 return;
2075 }
2076
2077 dprintk("RPC: %5u call_connect xprt %p %s connected\n",
2078 task->tk_pid, xprt,
2079 (xprt_connected(xprt) ? "is" : "is not"));
2080
2081 task->tk_action = call_connect_status;
2082 if (task->tk_status < 0)
2083 return;
2084 if (task->tk_flags & RPC_TASK_NOCONNECT) {
2085 rpc_call_rpcerror(task, -ENOTCONN);
2086 return;
2087 }
2088 if (!xprt_prepare_transmit(task))
2089 return;
2090 xprt_connect(task);
2091}
2092
2093
2094
2095
2096static void
2097call_connect_status(struct rpc_task *task)
2098{
2099 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
2100 struct rpc_clnt *clnt = task->tk_client;
2101 int status = task->tk_status;
2102
2103 if (rpc_task_transmitted(task)) {
2104 rpc_task_handle_transmitted(task);
2105 return;
2106 }
2107
2108 dprint_status(task);
2109 trace_rpc_connect_status(task);
2110
2111 if (task->tk_status == 0) {
2112 clnt->cl_stats->netreconn++;
2113 goto out_next;
2114 }
2115 if (xprt_connected(xprt)) {
2116 task->tk_status = 0;
2117 goto out_next;
2118 }
2119
2120 task->tk_status = 0;
2121 switch (status) {
2122 case -ECONNREFUSED:
2123
2124 if (RPC_IS_SOFTCONN(task))
2125 break;
2126 if (clnt->cl_autobind) {
2127 rpc_force_rebind(clnt);
2128 goto out_retry;
2129 }
2130
2131 case -ECONNRESET:
2132 case -ECONNABORTED:
2133 case -ENETDOWN:
2134 case -ENETUNREACH:
2135 case -EHOSTUNREACH:
2136 case -EPIPE:
2137 xprt_conditional_disconnect(task->tk_rqstp->rq_xprt,
2138 task->tk_rqstp->rq_connect_cookie);
2139 if (RPC_IS_SOFTCONN(task))
2140 break;
2141
2142 rpc_delay(task, 3*HZ);
2143
2144 case -EADDRINUSE:
2145 case -ENOTCONN:
2146 case -EAGAIN:
2147 case -ETIMEDOUT:
2148 goto out_retry;
2149 case -ENOBUFS:
2150 rpc_delay(task, HZ >> 2);
2151 goto out_retry;
2152 }
2153 rpc_call_rpcerror(task, status);
2154 return;
2155out_next:
2156 task->tk_action = call_transmit;
2157 return;
2158out_retry:
2159
2160 task->tk_action = call_bind;
2161 rpc_check_timeout(task);
2162}
2163
2164
2165
2166
2167static void
2168call_transmit(struct rpc_task *task)
2169{
2170 if (rpc_task_transmitted(task)) {
2171 rpc_task_handle_transmitted(task);
2172 return;
2173 }
2174
2175 dprint_status(task);
2176
2177 task->tk_action = call_transmit_status;
2178 if (!xprt_prepare_transmit(task))
2179 return;
2180 task->tk_status = 0;
2181 if (test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate)) {
2182 if (!xprt_connected(task->tk_xprt)) {
2183 task->tk_status = -ENOTCONN;
2184 return;
2185 }
2186 xprt_transmit(task);
2187 }
2188 xprt_end_transmit(task);
2189}
2190
2191
2192
2193
2194static void
2195call_transmit_status(struct rpc_task *task)
2196{
2197 task->tk_action = call_status;
2198
2199
2200
2201
2202
2203 if (rpc_task_transmitted(task)) {
2204 task->tk_status = 0;
2205 xprt_request_wait_receive(task);
2206 return;
2207 }
2208
2209 switch (task->tk_status) {
2210 default:
2211 dprint_status(task);
2212 break;
2213 case -EBADMSG:
2214 task->tk_status = 0;
2215 task->tk_action = call_encode;
2216 break;
2217
2218
2219
2220
2221
2222
2223 case -ENOBUFS:
2224 rpc_delay(task, HZ>>2);
2225
2226 case -EBADSLT:
2227 case -EAGAIN:
2228 task->tk_action = call_transmit;
2229 task->tk_status = 0;
2230 break;
2231 case -ECONNREFUSED:
2232 case -EHOSTDOWN:
2233 case -ENETDOWN:
2234 case -EHOSTUNREACH:
2235 case -ENETUNREACH:
2236 case -EPERM:
2237 if (RPC_IS_SOFTCONN(task)) {
2238 if (!task->tk_msg.rpc_proc->p_proc)
2239 trace_xprt_ping(task->tk_xprt,
2240 task->tk_status);
2241 rpc_call_rpcerror(task, task->tk_status);
2242 return;
2243 }
2244
2245 case -ECONNRESET:
2246 case -ECONNABORTED:
2247 case -EADDRINUSE:
2248 case -ENOTCONN:
2249 case -EPIPE:
2250 task->tk_action = call_bind;
2251 task->tk_status = 0;
2252 break;
2253 }
2254 rpc_check_timeout(task);
2255}
2256
2257#if defined(CONFIG_SUNRPC_BACKCHANNEL)
2258static void call_bc_transmit(struct rpc_task *task);
2259static void call_bc_transmit_status(struct rpc_task *task);
2260
2261static void
2262call_bc_encode(struct rpc_task *task)
2263{
2264 xprt_request_enqueue_transmit(task);
2265 task->tk_action = call_bc_transmit;
2266}
2267
2268
2269
2270
2271
2272static void
2273call_bc_transmit(struct rpc_task *task)
2274{
2275 task->tk_action = call_bc_transmit_status;
2276 if (test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate)) {
2277 if (!xprt_prepare_transmit(task))
2278 return;
2279 task->tk_status = 0;
2280 xprt_transmit(task);
2281 }
2282 xprt_end_transmit(task);
2283}
2284
2285static void
2286call_bc_transmit_status(struct rpc_task *task)
2287{
2288 struct rpc_rqst *req = task->tk_rqstp;
2289
2290 if (rpc_task_transmitted(task))
2291 task->tk_status = 0;
2292
2293 dprint_status(task);
2294
2295 switch (task->tk_status) {
2296 case 0:
2297
2298 case -ENETDOWN:
2299 case -EHOSTDOWN:
2300 case -EHOSTUNREACH:
2301 case -ENETUNREACH:
2302 case -ECONNRESET:
2303 case -ECONNREFUSED:
2304 case -EADDRINUSE:
2305 case -ENOTCONN:
2306 case -EPIPE:
2307 break;
2308 case -ENOBUFS:
2309 rpc_delay(task, HZ>>2);
2310
2311 case -EBADSLT:
2312 case -EAGAIN:
2313 task->tk_status = 0;
2314 task->tk_action = call_bc_transmit;
2315 return;
2316 case -ETIMEDOUT:
2317
2318
2319
2320
2321
2322
2323
2324 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
2325 "error: %d\n", task->tk_status);
2326 xprt_conditional_disconnect(req->rq_xprt,
2327 req->rq_connect_cookie);
2328 break;
2329 default:
2330
2331
2332
2333
2334 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
2335 "error: %d\n", task->tk_status);
2336 break;
2337 }
2338 task->tk_action = rpc_exit_task;
2339}
2340#endif
2341
2342
2343
2344
2345static void
2346call_status(struct rpc_task *task)
2347{
2348 struct rpc_clnt *clnt = task->tk_client;
2349 int status;
2350
2351 if (!task->tk_msg.rpc_proc->p_proc)
2352 trace_xprt_ping(task->tk_xprt, task->tk_status);
2353
2354 dprint_status(task);
2355
2356 status = task->tk_status;
2357 if (status >= 0) {
2358 task->tk_action = call_decode;
2359 return;
2360 }
2361
2362 trace_rpc_call_status(task);
2363 task->tk_status = 0;
2364 switch(status) {
2365 case -EHOSTDOWN:
2366 case -ENETDOWN:
2367 case -EHOSTUNREACH:
2368 case -ENETUNREACH:
2369 case -EPERM:
2370 if (RPC_IS_SOFTCONN(task))
2371 goto out_exit;
2372
2373
2374
2375
2376 rpc_delay(task, 3*HZ);
2377
2378 case -ETIMEDOUT:
2379 break;
2380 case -ECONNREFUSED:
2381 case -ECONNRESET:
2382 case -ECONNABORTED:
2383 case -ENOTCONN:
2384 rpc_force_rebind(clnt);
2385 break;
2386 case -EADDRINUSE:
2387 rpc_delay(task, 3*HZ);
2388
2389 case -EPIPE:
2390 case -EAGAIN:
2391 break;
2392 case -EIO:
2393
2394 goto out_exit;
2395 default:
2396 if (clnt->cl_chatty)
2397 printk("%s: RPC call returned error %d\n",
2398 clnt->cl_program->name, -status);
2399 goto out_exit;
2400 }
2401 task->tk_action = call_encode;
2402 rpc_check_timeout(task);
2403 return;
2404out_exit:
2405 rpc_call_rpcerror(task, status);
2406}
2407
2408static bool
2409rpc_check_connected(const struct rpc_rqst *req)
2410{
2411
2412 if (!req || !req->rq_xprt)
2413 return true;
2414 return xprt_connected(req->rq_xprt);
2415}
2416
2417static void
2418rpc_check_timeout(struct rpc_task *task)
2419{
2420 struct rpc_clnt *clnt = task->tk_client;
2421
2422 if (xprt_adjust_timeout(task->tk_rqstp) == 0)
2423 return;
2424
2425 dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid);
2426 task->tk_timeouts++;
2427
2428 if (RPC_IS_SOFTCONN(task) && !rpc_check_connected(task->tk_rqstp)) {
2429 rpc_call_rpcerror(task, -ETIMEDOUT);
2430 return;
2431 }
2432
2433 if (RPC_IS_SOFT(task)) {
2434
2435
2436
2437
2438
2439 if ((task->tk_flags & RPC_TASK_NO_RETRANS_TIMEOUT) &&
2440 rpc_check_connected(task->tk_rqstp))
2441 return;
2442
2443 if (clnt->cl_chatty) {
2444 pr_notice_ratelimited(
2445 "%s: server %s not responding, timed out\n",
2446 clnt->cl_program->name,
2447 task->tk_xprt->servername);
2448 }
2449 if (task->tk_flags & RPC_TASK_TIMEOUT)
2450 rpc_call_rpcerror(task, -ETIMEDOUT);
2451 else
2452 __rpc_call_rpcerror(task, -EIO, -ETIMEDOUT);
2453 return;
2454 }
2455
2456 if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) {
2457 task->tk_flags |= RPC_CALL_MAJORSEEN;
2458 if (clnt->cl_chatty) {
2459 pr_notice_ratelimited(
2460 "%s: server %s not responding, still trying\n",
2461 clnt->cl_program->name,
2462 task->tk_xprt->servername);
2463 }
2464 }
2465 rpc_force_rebind(clnt);
2466
2467
2468
2469
2470 rpcauth_invalcred(task);
2471}
2472
2473
2474
2475
2476static void
2477call_decode(struct rpc_task *task)
2478{
2479 struct rpc_clnt *clnt = task->tk_client;
2480 struct rpc_rqst *req = task->tk_rqstp;
2481 struct xdr_stream xdr;
2482
2483 dprint_status(task);
2484
2485 if (!task->tk_msg.rpc_proc->p_decode) {
2486 task->tk_action = rpc_exit_task;
2487 return;
2488 }
2489
2490 if (task->tk_flags & RPC_CALL_MAJORSEEN) {
2491 if (clnt->cl_chatty) {
2492 pr_notice_ratelimited("%s: server %s OK\n",
2493 clnt->cl_program->name,
2494 task->tk_xprt->servername);
2495 }
2496 task->tk_flags &= ~RPC_CALL_MAJORSEEN;
2497 }
2498
2499
2500
2501
2502
2503 smp_rmb();
2504 req->rq_rcv_buf.len = req->rq_private_buf.len;
2505
2506
2507 WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf,
2508 sizeof(req->rq_rcv_buf)) != 0);
2509
2510 xdr_init_decode(&xdr, &req->rq_rcv_buf,
2511 req->rq_rcv_buf.head[0].iov_base, req);
2512 switch (rpc_decode_header(task, &xdr)) {
2513 case 0:
2514 task->tk_action = rpc_exit_task;
2515 task->tk_status = rpcauth_unwrap_resp(task, &xdr);
2516 dprintk("RPC: %5u %s result %d\n",
2517 task->tk_pid, __func__, task->tk_status);
2518 return;
2519 case -EAGAIN:
2520 task->tk_status = 0;
2521 xdr_free_bvec(&req->rq_rcv_buf);
2522 req->rq_reply_bytes_recvd = 0;
2523 req->rq_rcv_buf.len = 0;
2524 if (task->tk_client->cl_discrtry)
2525 xprt_conditional_disconnect(req->rq_xprt,
2526 req->rq_connect_cookie);
2527 task->tk_action = call_encode;
2528 rpc_check_timeout(task);
2529 break;
2530 case -EKEYREJECTED:
2531 task->tk_action = call_reserve;
2532 rpc_check_timeout(task);
2533 rpcauth_invalcred(task);
2534
2535 xprt_release(task);
2536 }
2537}
2538
2539static int
2540rpc_encode_header(struct rpc_task *task, struct xdr_stream *xdr)
2541{
2542 struct rpc_clnt *clnt = task->tk_client;
2543 struct rpc_rqst *req = task->tk_rqstp;
2544 __be32 *p;
2545 int error;
2546
2547 error = -EMSGSIZE;
2548 p = xdr_reserve_space(xdr, RPC_CALLHDRSIZE << 2);
2549 if (!p)
2550 goto out_fail;
2551 *p++ = req->rq_xid;
2552 *p++ = rpc_call;
2553 *p++ = cpu_to_be32(RPC_VERSION);
2554 *p++ = cpu_to_be32(clnt->cl_prog);
2555 *p++ = cpu_to_be32(clnt->cl_vers);
2556 *p = cpu_to_be32(task->tk_msg.rpc_proc->p_proc);
2557
2558 error = rpcauth_marshcred(task, xdr);
2559 if (error < 0)
2560 goto out_fail;
2561 return 0;
2562out_fail:
2563 trace_rpc_bad_callhdr(task);
2564 rpc_exit(task, error);
2565 return error;
2566}
2567
2568static noinline int
2569rpc_decode_header(struct rpc_task *task, struct xdr_stream *xdr)
2570{
2571 struct rpc_clnt *clnt = task->tk_client;
2572 int error;
2573 __be32 *p;
2574
2575
2576
2577
2578
2579
2580 if (task->tk_rqstp->rq_rcv_buf.len & 3)
2581 goto out_unparsable;
2582
2583 p = xdr_inline_decode(xdr, 3 * sizeof(*p));
2584 if (!p)
2585 goto out_unparsable;
2586 p++;
2587 if (*p++ != rpc_reply)
2588 goto out_unparsable;
2589 if (*p++ != rpc_msg_accepted)
2590 goto out_msg_denied;
2591
2592 error = rpcauth_checkverf(task, xdr);
2593 if (error)
2594 goto out_verifier;
2595
2596 p = xdr_inline_decode(xdr, sizeof(*p));
2597 if (!p)
2598 goto out_unparsable;
2599 switch (*p) {
2600 case rpc_success:
2601 return 0;
2602 case rpc_prog_unavail:
2603 trace_rpc__prog_unavail(task);
2604 error = -EPFNOSUPPORT;
2605 goto out_err;
2606 case rpc_prog_mismatch:
2607 trace_rpc__prog_mismatch(task);
2608 error = -EPROTONOSUPPORT;
2609 goto out_err;
2610 case rpc_proc_unavail:
2611 trace_rpc__proc_unavail(task);
2612 error = -EOPNOTSUPP;
2613 goto out_err;
2614 case rpc_garbage_args:
2615 case rpc_system_err:
2616 trace_rpc__garbage_args(task);
2617 error = -EIO;
2618 break;
2619 default:
2620 goto out_unparsable;
2621 }
2622
2623out_garbage:
2624 clnt->cl_stats->rpcgarbage++;
2625 if (task->tk_garb_retry) {
2626 task->tk_garb_retry--;
2627 task->tk_action = call_encode;
2628 return -EAGAIN;
2629 }
2630out_err:
2631 rpc_exit(task, error);
2632 return error;
2633
2634out_unparsable:
2635 trace_rpc__unparsable(task);
2636 error = -EIO;
2637 goto out_garbage;
2638
2639out_verifier:
2640 trace_rpc_bad_verifier(task);
2641 goto out_garbage;
2642
2643out_msg_denied:
2644 error = -EACCES;
2645 p = xdr_inline_decode(xdr, sizeof(*p));
2646 if (!p)
2647 goto out_unparsable;
2648 switch (*p++) {
2649 case rpc_auth_error:
2650 break;
2651 case rpc_mismatch:
2652 trace_rpc__mismatch(task);
2653 error = -EPROTONOSUPPORT;
2654 goto out_err;
2655 default:
2656 goto out_unparsable;
2657 }
2658
2659 p = xdr_inline_decode(xdr, sizeof(*p));
2660 if (!p)
2661 goto out_unparsable;
2662 switch (*p++) {
2663 case rpc_autherr_rejectedcred:
2664 case rpc_autherr_rejectedverf:
2665 case rpcsec_gsserr_credproblem:
2666 case rpcsec_gsserr_ctxproblem:
2667 if (!task->tk_cred_retry)
2668 break;
2669 task->tk_cred_retry--;
2670 trace_rpc__stale_creds(task);
2671 return -EKEYREJECTED;
2672 case rpc_autherr_badcred:
2673 case rpc_autherr_badverf:
2674
2675 if (!task->tk_garb_retry)
2676 break;
2677 task->tk_garb_retry--;
2678 trace_rpc__bad_creds(task);
2679 task->tk_action = call_encode;
2680 return -EAGAIN;
2681 case rpc_autherr_tooweak:
2682 trace_rpc__auth_tooweak(task);
2683 pr_warn("RPC: server %s requires stronger authentication.\n",
2684 task->tk_xprt->servername);
2685 break;
2686 default:
2687 goto out_unparsable;
2688 }
2689 goto out_err;
2690}
2691
2692static void rpcproc_encode_null(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
2693 const void *obj)
2694{
2695}
2696
2697static int rpcproc_decode_null(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
2698 void *obj)
2699{
2700 return 0;
2701}
2702
2703static const struct rpc_procinfo rpcproc_null = {
2704 .p_encode = rpcproc_encode_null,
2705 .p_decode = rpcproc_decode_null,
2706};
2707
2708static int rpc_ping(struct rpc_clnt *clnt)
2709{
2710 struct rpc_message msg = {
2711 .rpc_proc = &rpcproc_null,
2712 };
2713 int err;
2714 err = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN |
2715 RPC_TASK_NULLCREDS);
2716 return err;
2717}
2718
2719static
2720struct rpc_task *rpc_call_null_helper(struct rpc_clnt *clnt,
2721 struct rpc_xprt *xprt, struct rpc_cred *cred, int flags,
2722 const struct rpc_call_ops *ops, void *data)
2723{
2724 struct rpc_message msg = {
2725 .rpc_proc = &rpcproc_null,
2726 };
2727 struct rpc_task_setup task_setup_data = {
2728 .rpc_client = clnt,
2729 .rpc_xprt = xprt,
2730 .rpc_message = &msg,
2731 .rpc_op_cred = cred,
2732 .callback_ops = (ops != NULL) ? ops : &rpc_default_ops,
2733 .callback_data = data,
2734 .flags = flags | RPC_TASK_NULLCREDS,
2735 };
2736
2737 return rpc_run_task(&task_setup_data);
2738}
2739
2740struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags)
2741{
2742 return rpc_call_null_helper(clnt, NULL, cred, flags, NULL, NULL);
2743}
2744EXPORT_SYMBOL_GPL(rpc_call_null);
2745
2746struct rpc_cb_add_xprt_calldata {
2747 struct rpc_xprt_switch *xps;
2748 struct rpc_xprt *xprt;
2749};
2750
2751static void rpc_cb_add_xprt_done(struct rpc_task *task, void *calldata)
2752{
2753 struct rpc_cb_add_xprt_calldata *data = calldata;
2754
2755 if (task->tk_status == 0)
2756 rpc_xprt_switch_add_xprt(data->xps, data->xprt);
2757}
2758
2759static void rpc_cb_add_xprt_release(void *calldata)
2760{
2761 struct rpc_cb_add_xprt_calldata *data = calldata;
2762
2763 xprt_put(data->xprt);
2764 xprt_switch_put(data->xps);
2765 kfree(data);
2766}
2767
2768static const struct rpc_call_ops rpc_cb_add_xprt_call_ops = {
2769 .rpc_call_done = rpc_cb_add_xprt_done,
2770 .rpc_release = rpc_cb_add_xprt_release,
2771};
2772
2773
2774
2775
2776
2777
2778
2779
2780int rpc_clnt_test_and_add_xprt(struct rpc_clnt *clnt,
2781 struct rpc_xprt_switch *xps, struct rpc_xprt *xprt,
2782 void *dummy)
2783{
2784 struct rpc_cb_add_xprt_calldata *data;
2785 struct rpc_task *task;
2786
2787 data = kmalloc(sizeof(*data), GFP_NOFS);
2788 if (!data)
2789 return -ENOMEM;
2790 data->xps = xprt_switch_get(xps);
2791 data->xprt = xprt_get(xprt);
2792 if (rpc_xprt_switch_has_addr(data->xps, (struct sockaddr *)&xprt->addr)) {
2793 rpc_cb_add_xprt_release(data);
2794 goto success;
2795 }
2796
2797 task = rpc_call_null_helper(clnt, xprt, NULL,
2798 RPC_TASK_SOFT|RPC_TASK_SOFTCONN|RPC_TASK_ASYNC|RPC_TASK_NULLCREDS,
2799 &rpc_cb_add_xprt_call_ops, data);
2800 if (IS_ERR(task))
2801 return PTR_ERR(task);
2802 rpc_put_task(task);
2803success:
2804 return 1;
2805}
2806EXPORT_SYMBOL_GPL(rpc_clnt_test_and_add_xprt);
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826int rpc_clnt_setup_test_and_add_xprt(struct rpc_clnt *clnt,
2827 struct rpc_xprt_switch *xps,
2828 struct rpc_xprt *xprt,
2829 void *data)
2830{
2831 struct rpc_task *task;
2832 struct rpc_add_xprt_test *xtest = (struct rpc_add_xprt_test *)data;
2833 int status = -EADDRINUSE;
2834
2835 xprt = xprt_get(xprt);
2836 xprt_switch_get(xps);
2837
2838 if (rpc_xprt_switch_has_addr(xps, (struct sockaddr *)&xprt->addr))
2839 goto out_err;
2840
2841
2842 task = rpc_call_null_helper(clnt, xprt, NULL,
2843 RPC_TASK_SOFT | RPC_TASK_SOFTCONN | RPC_TASK_NULLCREDS,
2844 NULL, NULL);
2845 if (IS_ERR(task)) {
2846 status = PTR_ERR(task);
2847 goto out_err;
2848 }
2849 status = task->tk_status;
2850 rpc_put_task(task);
2851
2852 if (status < 0)
2853 goto out_err;
2854
2855
2856 xtest->add_xprt_test(clnt, xprt, xtest->data);
2857
2858 xprt_put(xprt);
2859 xprt_switch_put(xps);
2860
2861
2862 return 1;
2863out_err:
2864 xprt_put(xprt);
2865 xprt_switch_put(xps);
2866 pr_info("RPC: rpc_clnt_test_xprt failed: %d addr %s not added\n",
2867 status, xprt->address_strings[RPC_DISPLAY_ADDR]);
2868 return status;
2869}
2870EXPORT_SYMBOL_GPL(rpc_clnt_setup_test_and_add_xprt);
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885int rpc_clnt_add_xprt(struct rpc_clnt *clnt,
2886 struct xprt_create *xprtargs,
2887 int (*setup)(struct rpc_clnt *,
2888 struct rpc_xprt_switch *,
2889 struct rpc_xprt *,
2890 void *),
2891 void *data)
2892{
2893 struct rpc_xprt_switch *xps;
2894 struct rpc_xprt *xprt;
2895 unsigned long connect_timeout;
2896 unsigned long reconnect_timeout;
2897 unsigned char resvport;
2898 int ret = 0;
2899
2900 rcu_read_lock();
2901 xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch));
2902 xprt = xprt_iter_xprt(&clnt->cl_xpi);
2903 if (xps == NULL || xprt == NULL) {
2904 rcu_read_unlock();
2905 xprt_switch_put(xps);
2906 return -EAGAIN;
2907 }
2908 resvport = xprt->resvport;
2909 connect_timeout = xprt->connect_timeout;
2910 reconnect_timeout = xprt->max_reconnect_timeout;
2911 rcu_read_unlock();
2912
2913 xprt = xprt_create_transport(xprtargs);
2914 if (IS_ERR(xprt)) {
2915 ret = PTR_ERR(xprt);
2916 goto out_put_switch;
2917 }
2918 xprt->resvport = resvport;
2919 if (xprt->ops->set_connect_timeout != NULL)
2920 xprt->ops->set_connect_timeout(xprt,
2921 connect_timeout,
2922 reconnect_timeout);
2923
2924 rpc_xprt_switch_set_roundrobin(xps);
2925 if (setup) {
2926 ret = setup(clnt, xps, xprt, data);
2927 if (ret != 0)
2928 goto out_put_xprt;
2929 }
2930 rpc_xprt_switch_add_xprt(xps, xprt);
2931out_put_xprt:
2932 xprt_put(xprt);
2933out_put_switch:
2934 xprt_switch_put(xps);
2935 return ret;
2936}
2937EXPORT_SYMBOL_GPL(rpc_clnt_add_xprt);
2938
2939struct connect_timeout_data {
2940 unsigned long connect_timeout;
2941 unsigned long reconnect_timeout;
2942};
2943
2944static int
2945rpc_xprt_set_connect_timeout(struct rpc_clnt *clnt,
2946 struct rpc_xprt *xprt,
2947 void *data)
2948{
2949 struct connect_timeout_data *timeo = data;
2950
2951 if (xprt->ops->set_connect_timeout)
2952 xprt->ops->set_connect_timeout(xprt,
2953 timeo->connect_timeout,
2954 timeo->reconnect_timeout);
2955 return 0;
2956}
2957
2958void
2959rpc_set_connect_timeout(struct rpc_clnt *clnt,
2960 unsigned long connect_timeout,
2961 unsigned long reconnect_timeout)
2962{
2963 struct connect_timeout_data timeout = {
2964 .connect_timeout = connect_timeout,
2965 .reconnect_timeout = reconnect_timeout,
2966 };
2967 rpc_clnt_iterate_for_each_xprt(clnt,
2968 rpc_xprt_set_connect_timeout,
2969 &timeout);
2970}
2971EXPORT_SYMBOL_GPL(rpc_set_connect_timeout);
2972
2973void rpc_clnt_xprt_switch_put(struct rpc_clnt *clnt)
2974{
2975 rcu_read_lock();
2976 xprt_switch_put(rcu_dereference(clnt->cl_xpi.xpi_xpswitch));
2977 rcu_read_unlock();
2978}
2979EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_put);
2980
2981void rpc_clnt_xprt_switch_add_xprt(struct rpc_clnt *clnt, struct rpc_xprt *xprt)
2982{
2983 rcu_read_lock();
2984 rpc_xprt_switch_add_xprt(rcu_dereference(clnt->cl_xpi.xpi_xpswitch),
2985 xprt);
2986 rcu_read_unlock();
2987}
2988EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_add_xprt);
2989
2990bool rpc_clnt_xprt_switch_has_addr(struct rpc_clnt *clnt,
2991 const struct sockaddr *sap)
2992{
2993 struct rpc_xprt_switch *xps;
2994 bool ret;
2995
2996 rcu_read_lock();
2997 xps = rcu_dereference(clnt->cl_xpi.xpi_xpswitch);
2998 ret = rpc_xprt_switch_has_addr(xps, sap);
2999 rcu_read_unlock();
3000 return ret;
3001}
3002EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_has_addr);
3003
3004#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
3005static void rpc_show_header(void)
3006{
3007 printk(KERN_INFO "-pid- flgs status -client- --rqstp- "
3008 "-timeout ---ops--\n");
3009}
3010
3011static void rpc_show_task(const struct rpc_clnt *clnt,
3012 const struct rpc_task *task)
3013{
3014 const char *rpc_waitq = "none";
3015
3016 if (RPC_IS_QUEUED(task))
3017 rpc_waitq = rpc_qname(task->tk_waitqueue);
3018
3019 printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%ps q:%s\n",
3020 task->tk_pid, task->tk_flags, task->tk_status,
3021 clnt, task->tk_rqstp, rpc_task_timeout(task), task->tk_ops,
3022 clnt->cl_program->name, clnt->cl_vers, rpc_proc_name(task),
3023 task->tk_action, rpc_waitq);
3024}
3025
3026void rpc_show_tasks(struct net *net)
3027{
3028 struct rpc_clnt *clnt;
3029 struct rpc_task *task;
3030 int header = 0;
3031 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
3032
3033 spin_lock(&sn->rpc_client_lock);
3034 list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
3035 spin_lock(&clnt->cl_lock);
3036 list_for_each_entry(task, &clnt->cl_tasks, tk_task) {
3037 if (!header) {
3038 rpc_show_header();
3039 header++;
3040 }
3041 rpc_show_task(clnt, task);
3042 }
3043 spin_unlock(&clnt->cl_lock);
3044 }
3045 spin_unlock(&sn->rpc_client_lock);
3046}
3047#endif
3048
3049#if IS_ENABLED(CONFIG_SUNRPC_SWAP)
3050static int
3051rpc_clnt_swap_activate_callback(struct rpc_clnt *clnt,
3052 struct rpc_xprt *xprt,
3053 void *dummy)
3054{
3055 return xprt_enable_swap(xprt);
3056}
3057
3058int
3059rpc_clnt_swap_activate(struct rpc_clnt *clnt)
3060{
3061 if (atomic_inc_return(&clnt->cl_swapper) == 1)
3062 return rpc_clnt_iterate_for_each_xprt(clnt,
3063 rpc_clnt_swap_activate_callback, NULL);
3064 return 0;
3065}
3066EXPORT_SYMBOL_GPL(rpc_clnt_swap_activate);
3067
3068static int
3069rpc_clnt_swap_deactivate_callback(struct rpc_clnt *clnt,
3070 struct rpc_xprt *xprt,
3071 void *dummy)
3072{
3073 xprt_disable_swap(xprt);
3074 return 0;
3075}
3076
3077void
3078rpc_clnt_swap_deactivate(struct rpc_clnt *clnt)
3079{
3080 if (atomic_dec_if_positive(&clnt->cl_swapper) == 0)
3081 rpc_clnt_iterate_for_each_xprt(clnt,
3082 rpc_clnt_swap_deactivate_callback, NULL);
3083}
3084EXPORT_SYMBOL_GPL(rpc_clnt_swap_deactivate);
3085#endif
3086