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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
51
52
53
54static DECLARE_WAIT_QUEUE_HEAD(destroy_wait);
55
56
57static void call_start(struct rpc_task *task);
58static void call_reserve(struct rpc_task *task);
59static void call_reserveresult(struct rpc_task *task);
60static void call_allocate(struct rpc_task *task);
61static void call_encode(struct rpc_task *task);
62static void call_decode(struct rpc_task *task);
63static void call_bind(struct rpc_task *task);
64static void call_bind_status(struct rpc_task *task);
65static void call_transmit(struct rpc_task *task);
66static void call_status(struct rpc_task *task);
67static void call_transmit_status(struct rpc_task *task);
68static void call_refresh(struct rpc_task *task);
69static void call_refreshresult(struct rpc_task *task);
70static void call_connect(struct rpc_task *task);
71static void call_connect_status(struct rpc_task *task);
72
73static int rpc_encode_header(struct rpc_task *task,
74 struct xdr_stream *xdr);
75static int rpc_decode_header(struct rpc_task *task,
76 struct xdr_stream *xdr);
77static int rpc_ping(struct rpc_clnt *clnt);
78static void rpc_check_timeout(struct rpc_task *task);
79
80static void rpc_register_client(struct rpc_clnt *clnt)
81{
82 struct net *net = rpc_net_ns(clnt);
83 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
84
85 spin_lock(&sn->rpc_client_lock);
86 list_add(&clnt->cl_clients, &sn->all_clients);
87 spin_unlock(&sn->rpc_client_lock);
88}
89
90static void rpc_unregister_client(struct rpc_clnt *clnt)
91{
92 struct net *net = rpc_net_ns(clnt);
93 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
94
95 spin_lock(&sn->rpc_client_lock);
96 list_del(&clnt->cl_clients);
97 spin_unlock(&sn->rpc_client_lock);
98}
99
100static void __rpc_clnt_remove_pipedir(struct rpc_clnt *clnt)
101{
102 rpc_remove_client_dir(clnt);
103}
104
105static void rpc_clnt_remove_pipedir(struct rpc_clnt *clnt)
106{
107 struct net *net = rpc_net_ns(clnt);
108 struct super_block *pipefs_sb;
109
110 pipefs_sb = rpc_get_sb_net(net);
111 if (pipefs_sb) {
112 __rpc_clnt_remove_pipedir(clnt);
113 rpc_put_sb_net(net);
114 }
115}
116
117static struct dentry *rpc_setup_pipedir_sb(struct super_block *sb,
118 struct rpc_clnt *clnt)
119{
120 static uint32_t clntid;
121 const char *dir_name = clnt->cl_program->pipe_dir_name;
122 char name[15];
123 struct dentry *dir, *dentry;
124
125 dir = rpc_d_lookup_sb(sb, dir_name);
126 if (dir == NULL) {
127 pr_info("RPC: pipefs directory doesn't exist: %s\n", dir_name);
128 return dir;
129 }
130 for (;;) {
131 snprintf(name, sizeof(name), "clnt%x", (unsigned int)clntid++);
132 name[sizeof(name) - 1] = '\0';
133 dentry = rpc_create_client_dir(dir, name, clnt);
134 if (!IS_ERR(dentry))
135 break;
136 if (dentry == ERR_PTR(-EEXIST))
137 continue;
138 printk(KERN_INFO "RPC: Couldn't create pipefs entry"
139 " %s/%s, error %ld\n",
140 dir_name, name, PTR_ERR(dentry));
141 break;
142 }
143 dput(dir);
144 return dentry;
145}
146
147static int
148rpc_setup_pipedir(struct super_block *pipefs_sb, struct rpc_clnt *clnt)
149{
150 struct dentry *dentry;
151
152 if (clnt->cl_program->pipe_dir_name != NULL) {
153 dentry = rpc_setup_pipedir_sb(pipefs_sb, clnt);
154 if (IS_ERR(dentry))
155 return PTR_ERR(dentry);
156 }
157 return 0;
158}
159
160static int rpc_clnt_skip_event(struct rpc_clnt *clnt, unsigned long event)
161{
162 if (clnt->cl_program->pipe_dir_name == NULL)
163 return 1;
164
165 switch (event) {
166 case RPC_PIPEFS_MOUNT:
167 if (clnt->cl_pipedir_objects.pdh_dentry != NULL)
168 return 1;
169 if (atomic_read(&clnt->cl_count) == 0)
170 return 1;
171 break;
172 case RPC_PIPEFS_UMOUNT:
173 if (clnt->cl_pipedir_objects.pdh_dentry == NULL)
174 return 1;
175 break;
176 }
177 return 0;
178}
179
180static int __rpc_clnt_handle_event(struct rpc_clnt *clnt, unsigned long event,
181 struct super_block *sb)
182{
183 struct dentry *dentry;
184
185 switch (event) {
186 case RPC_PIPEFS_MOUNT:
187 dentry = rpc_setup_pipedir_sb(sb, clnt);
188 if (!dentry)
189 return -ENOENT;
190 if (IS_ERR(dentry))
191 return PTR_ERR(dentry);
192 break;
193 case RPC_PIPEFS_UMOUNT:
194 __rpc_clnt_remove_pipedir(clnt);
195 break;
196 default:
197 printk(KERN_ERR "%s: unknown event: %ld\n", __func__, event);
198 return -ENOTSUPP;
199 }
200 return 0;
201}
202
203static int __rpc_pipefs_event(struct rpc_clnt *clnt, unsigned long event,
204 struct super_block *sb)
205{
206 int error = 0;
207
208 for (;; clnt = clnt->cl_parent) {
209 if (!rpc_clnt_skip_event(clnt, event))
210 error = __rpc_clnt_handle_event(clnt, event, sb);
211 if (error || clnt == clnt->cl_parent)
212 break;
213 }
214 return error;
215}
216
217static struct rpc_clnt *rpc_get_client_for_event(struct net *net, int event)
218{
219 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
220 struct rpc_clnt *clnt;
221
222 spin_lock(&sn->rpc_client_lock);
223 list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
224 if (rpc_clnt_skip_event(clnt, event))
225 continue;
226 spin_unlock(&sn->rpc_client_lock);
227 return clnt;
228 }
229 spin_unlock(&sn->rpc_client_lock);
230 return NULL;
231}
232
233static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
234 void *ptr)
235{
236 struct super_block *sb = ptr;
237 struct rpc_clnt *clnt;
238 int error = 0;
239
240 while ((clnt = rpc_get_client_for_event(sb->s_fs_info, event))) {
241 error = __rpc_pipefs_event(clnt, event, sb);
242 if (error)
243 break;
244 }
245 return error;
246}
247
248static struct notifier_block rpc_clients_block = {
249 .notifier_call = rpc_pipefs_event,
250 .priority = SUNRPC_PIPEFS_RPC_PRIO,
251};
252
253int rpc_clients_notifier_register(void)
254{
255 return rpc_pipefs_notifier_register(&rpc_clients_block);
256}
257
258void rpc_clients_notifier_unregister(void)
259{
260 return rpc_pipefs_notifier_unregister(&rpc_clients_block);
261}
262
263static struct rpc_xprt *rpc_clnt_set_transport(struct rpc_clnt *clnt,
264 struct rpc_xprt *xprt,
265 const struct rpc_timeout *timeout)
266{
267 struct rpc_xprt *old;
268
269 spin_lock(&clnt->cl_lock);
270 old = rcu_dereference_protected(clnt->cl_xprt,
271 lockdep_is_held(&clnt->cl_lock));
272
273 if (!xprt_bound(xprt))
274 clnt->cl_autobind = 1;
275
276 clnt->cl_timeout = timeout;
277 rcu_assign_pointer(clnt->cl_xprt, xprt);
278 spin_unlock(&clnt->cl_lock);
279
280 return old;
281}
282
283static void rpc_clnt_set_nodename(struct rpc_clnt *clnt, const char *nodename)
284{
285 clnt->cl_nodelen = strlcpy(clnt->cl_nodename,
286 nodename, sizeof(clnt->cl_nodename));
287}
288
289static int rpc_client_register(struct rpc_clnt *clnt,
290 rpc_authflavor_t pseudoflavor,
291 const char *client_name)
292{
293 struct rpc_auth_create_args auth_args = {
294 .pseudoflavor = pseudoflavor,
295 .target_name = client_name,
296 };
297 struct rpc_auth *auth;
298 struct net *net = rpc_net_ns(clnt);
299 struct super_block *pipefs_sb;
300 int err;
301
302 rpc_clnt_debugfs_register(clnt);
303
304 pipefs_sb = rpc_get_sb_net(net);
305 if (pipefs_sb) {
306 err = rpc_setup_pipedir(pipefs_sb, clnt);
307 if (err)
308 goto out;
309 }
310
311 rpc_register_client(clnt);
312 if (pipefs_sb)
313 rpc_put_sb_net(net);
314
315 auth = rpcauth_create(&auth_args, clnt);
316 if (IS_ERR(auth)) {
317 dprintk("RPC: Couldn't create auth handle (flavor %u)\n",
318 pseudoflavor);
319 err = PTR_ERR(auth);
320 goto err_auth;
321 }
322 return 0;
323err_auth:
324 pipefs_sb = rpc_get_sb_net(net);
325 rpc_unregister_client(clnt);
326 __rpc_clnt_remove_pipedir(clnt);
327out:
328 if (pipefs_sb)
329 rpc_put_sb_net(net);
330 rpc_clnt_debugfs_unregister(clnt);
331 return err;
332}
333
334static DEFINE_IDA(rpc_clids);
335
336void rpc_cleanup_clids(void)
337{
338 ida_destroy(&rpc_clids);
339}
340
341static int rpc_alloc_clid(struct rpc_clnt *clnt)
342{
343 int clid;
344
345 clid = ida_simple_get(&rpc_clids, 0, 0, GFP_KERNEL);
346 if (clid < 0)
347 return clid;
348 clnt->cl_clid = clid;
349 return 0;
350}
351
352static void rpc_free_clid(struct rpc_clnt *clnt)
353{
354 ida_simple_remove(&rpc_clids, clnt->cl_clid);
355}
356
357static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args,
358 struct rpc_xprt_switch *xps,
359 struct rpc_xprt *xprt,
360 struct rpc_clnt *parent)
361{
362 const struct rpc_program *program = args->program;
363 const struct rpc_version *version;
364 struct rpc_clnt *clnt = NULL;
365 const struct rpc_timeout *timeout;
366 const char *nodename = args->nodename;
367 int err;
368
369 err = rpciod_up();
370 if (err)
371 goto out_no_rpciod;
372
373 err = -EINVAL;
374 if (args->version >= program->nrvers)
375 goto out_err;
376 version = program->version[args->version];
377 if (version == NULL)
378 goto out_err;
379
380 err = -ENOMEM;
381 clnt = kzalloc(sizeof(*clnt), GFP_KERNEL);
382 if (!clnt)
383 goto out_err;
384 clnt->cl_parent = parent ? : clnt;
385
386 err = rpc_alloc_clid(clnt);
387 if (err)
388 goto out_no_clid;
389
390 clnt->cl_cred = get_cred(args->cred);
391 clnt->cl_procinfo = version->procs;
392 clnt->cl_maxproc = version->nrprocs;
393 clnt->cl_prog = args->prognumber ? : program->number;
394 clnt->cl_vers = version->number;
395 clnt->cl_stats = program->stats;
396 clnt->cl_metrics = rpc_alloc_iostats(clnt);
397 rpc_init_pipe_dir_head(&clnt->cl_pipedir_objects);
398 err = -ENOMEM;
399 if (clnt->cl_metrics == NULL)
400 goto out_no_stats;
401 clnt->cl_program = program;
402 INIT_LIST_HEAD(&clnt->cl_tasks);
403 spin_lock_init(&clnt->cl_lock);
404
405 timeout = xprt->timeout;
406 if (args->timeout != NULL) {
407 memcpy(&clnt->cl_timeout_default, args->timeout,
408 sizeof(clnt->cl_timeout_default));
409 timeout = &clnt->cl_timeout_default;
410 }
411
412 rpc_clnt_set_transport(clnt, xprt, timeout);
413 xprt_iter_init(&clnt->cl_xpi, xps);
414 xprt_switch_put(xps);
415
416 clnt->cl_rtt = &clnt->cl_rtt_default;
417 rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval);
418
419 atomic_set(&clnt->cl_count, 1);
420
421 if (nodename == NULL)
422 nodename = utsname()->nodename;
423
424 rpc_clnt_set_nodename(clnt, nodename);
425
426 err = rpc_client_register(clnt, args->authflavor, args->client_name);
427 if (err)
428 goto out_no_path;
429 if (parent)
430 atomic_inc(&parent->cl_count);
431
432 trace_rpc_clnt_new(clnt, xprt, program->name, args->servername);
433 return clnt;
434
435out_no_path:
436 rpc_free_iostats(clnt->cl_metrics);
437out_no_stats:
438 put_cred(clnt->cl_cred);
439 rpc_free_clid(clnt);
440out_no_clid:
441 kfree(clnt);
442out_err:
443 rpciod_down();
444out_no_rpciod:
445 xprt_switch_put(xps);
446 xprt_put(xprt);
447 trace_rpc_clnt_new_err(program->name, args->servername, err);
448 return ERR_PTR(err);
449}
450
451static struct rpc_clnt *rpc_create_xprt(struct rpc_create_args *args,
452 struct rpc_xprt *xprt)
453{
454 struct rpc_clnt *clnt = NULL;
455 struct rpc_xprt_switch *xps;
456
457 if (args->bc_xprt && args->bc_xprt->xpt_bc_xps) {
458 WARN_ON_ONCE(!(args->protocol & XPRT_TRANSPORT_BC));
459 xps = args->bc_xprt->xpt_bc_xps;
460 xprt_switch_get(xps);
461 } else {
462 xps = xprt_switch_alloc(xprt, GFP_KERNEL);
463 if (xps == NULL) {
464 xprt_put(xprt);
465 return ERR_PTR(-ENOMEM);
466 }
467 if (xprt->bc_xprt) {
468 xprt_switch_get(xps);
469 xprt->bc_xprt->xpt_bc_xps = xps;
470 }
471 }
472 clnt = rpc_new_client(args, xps, xprt, NULL);
473 if (IS_ERR(clnt))
474 return clnt;
475
476 if (!(args->flags & RPC_CLNT_CREATE_NOPING)) {
477 int err = rpc_ping(clnt);
478 if (err != 0) {
479 rpc_shutdown_client(clnt);
480 return ERR_PTR(err);
481 }
482 }
483
484 clnt->cl_softrtry = 1;
485 if (args->flags & (RPC_CLNT_CREATE_HARDRTRY|RPC_CLNT_CREATE_SOFTERR)) {
486 clnt->cl_softrtry = 0;
487 if (args->flags & RPC_CLNT_CREATE_SOFTERR)
488 clnt->cl_softerr = 1;
489 }
490
491 if (args->flags & RPC_CLNT_CREATE_AUTOBIND)
492 clnt->cl_autobind = 1;
493 if (args->flags & RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT)
494 clnt->cl_noretranstimeo = 1;
495 if (args->flags & RPC_CLNT_CREATE_DISCRTRY)
496 clnt->cl_discrtry = 1;
497 if (!(args->flags & RPC_CLNT_CREATE_QUIET))
498 clnt->cl_chatty = 1;
499
500 return clnt;
501}
502
503
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505
506
507
508
509
510
511
512
513struct rpc_clnt *rpc_create(struct rpc_create_args *args)
514{
515 struct rpc_xprt *xprt;
516 struct xprt_create xprtargs = {
517 .net = args->net,
518 .ident = args->protocol,
519 .srcaddr = args->saddress,
520 .dstaddr = args->address,
521 .addrlen = args->addrsize,
522 .servername = args->servername,
523 .bc_xprt = args->bc_xprt,
524 };
525 char servername[48];
526 struct rpc_clnt *clnt;
527 int i;
528
529 if (args->bc_xprt) {
530 WARN_ON_ONCE(!(args->protocol & XPRT_TRANSPORT_BC));
531 xprt = args->bc_xprt->xpt_bc_xprt;
532 if (xprt) {
533 xprt_get(xprt);
534 return rpc_create_xprt(args, xprt);
535 }
536 }
537
538 if (args->flags & RPC_CLNT_CREATE_INFINITE_SLOTS)
539 xprtargs.flags |= XPRT_CREATE_INFINITE_SLOTS;
540 if (args->flags & RPC_CLNT_CREATE_NO_IDLE_TIMEOUT)
541 xprtargs.flags |= XPRT_CREATE_NO_IDLE_TIMEOUT;
542
543
544
545
546 if (xprtargs.servername == NULL) {
547 struct sockaddr_un *sun =
548 (struct sockaddr_un *)args->address;
549 struct sockaddr_in *sin =
550 (struct sockaddr_in *)args->address;
551 struct sockaddr_in6 *sin6 =
552 (struct sockaddr_in6 *)args->address;
553
554 servername[0] = '\0';
555 switch (args->address->sa_family) {
556 case AF_LOCAL:
557 snprintf(servername, sizeof(servername), "%s",
558 sun->sun_path);
559 break;
560 case AF_INET:
561 snprintf(servername, sizeof(servername), "%pI4",
562 &sin->sin_addr.s_addr);
563 break;
564 case AF_INET6:
565 snprintf(servername, sizeof(servername), "%pI6",
566 &sin6->sin6_addr);
567 break;
568 default:
569
570
571 return ERR_PTR(-EINVAL);
572 }
573 xprtargs.servername = servername;
574 }
575
576 xprt = xprt_create_transport(&xprtargs);
577 if (IS_ERR(xprt))
578 return (struct rpc_clnt *)xprt;
579
580
581
582
583
584
585
586 xprt->resvport = 1;
587 if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT)
588 xprt->resvport = 0;
589 xprt->reuseport = 0;
590 if (args->flags & RPC_CLNT_CREATE_REUSEPORT)
591 xprt->reuseport = 1;
592
593 clnt = rpc_create_xprt(args, xprt);
594 if (IS_ERR(clnt) || args->nconnect <= 1)
595 return clnt;
596
597 for (i = 0; i < args->nconnect - 1; i++) {
598 if (rpc_clnt_add_xprt(clnt, &xprtargs, NULL, NULL) < 0)
599 break;
600 }
601 return clnt;
602}
603EXPORT_SYMBOL_GPL(rpc_create);
604
605
606
607
608
609
610static struct rpc_clnt *__rpc_clone_client(struct rpc_create_args *args,
611 struct rpc_clnt *clnt)
612{
613 struct rpc_xprt_switch *xps;
614 struct rpc_xprt *xprt;
615 struct rpc_clnt *new;
616 int err;
617
618 err = -ENOMEM;
619 rcu_read_lock();
620 xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
621 xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch));
622 rcu_read_unlock();
623 if (xprt == NULL || xps == NULL) {
624 xprt_put(xprt);
625 xprt_switch_put(xps);
626 goto out_err;
627 }
628 args->servername = xprt->servername;
629 args->nodename = clnt->cl_nodename;
630
631 new = rpc_new_client(args, xps, xprt, clnt);
632 if (IS_ERR(new))
633 return new;
634
635
636 new->cl_autobind = 0;
637 new->cl_softrtry = clnt->cl_softrtry;
638 new->cl_softerr = clnt->cl_softerr;
639 new->cl_noretranstimeo = clnt->cl_noretranstimeo;
640 new->cl_discrtry = clnt->cl_discrtry;
641 new->cl_chatty = clnt->cl_chatty;
642 new->cl_principal = clnt->cl_principal;
643 return new;
644
645out_err:
646 trace_rpc_clnt_clone_err(clnt, err);
647 return ERR_PTR(err);
648}
649
650
651
652
653
654
655
656
657struct rpc_clnt *rpc_clone_client(struct rpc_clnt *clnt)
658{
659 struct rpc_create_args args = {
660 .program = clnt->cl_program,
661 .prognumber = clnt->cl_prog,
662 .version = clnt->cl_vers,
663 .authflavor = clnt->cl_auth->au_flavor,
664 .cred = clnt->cl_cred,
665 };
666 return __rpc_clone_client(&args, clnt);
667}
668EXPORT_SYMBOL_GPL(rpc_clone_client);
669
670
671
672
673
674
675
676
677
678struct rpc_clnt *
679rpc_clone_client_set_auth(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
680{
681 struct rpc_create_args args = {
682 .program = clnt->cl_program,
683 .prognumber = clnt->cl_prog,
684 .version = clnt->cl_vers,
685 .authflavor = flavor,
686 .cred = clnt->cl_cred,
687 };
688 return __rpc_clone_client(&args, clnt);
689}
690EXPORT_SYMBOL_GPL(rpc_clone_client_set_auth);
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707int rpc_switch_client_transport(struct rpc_clnt *clnt,
708 struct xprt_create *args,
709 const struct rpc_timeout *timeout)
710{
711 const struct rpc_timeout *old_timeo;
712 rpc_authflavor_t pseudoflavor;
713 struct rpc_xprt_switch *xps, *oldxps;
714 struct rpc_xprt *xprt, *old;
715 struct rpc_clnt *parent;
716 int err;
717
718 xprt = xprt_create_transport(args);
719 if (IS_ERR(xprt))
720 return PTR_ERR(xprt);
721
722 xps = xprt_switch_alloc(xprt, GFP_KERNEL);
723 if (xps == NULL) {
724 xprt_put(xprt);
725 return -ENOMEM;
726 }
727
728 pseudoflavor = clnt->cl_auth->au_flavor;
729
730 old_timeo = clnt->cl_timeout;
731 old = rpc_clnt_set_transport(clnt, xprt, timeout);
732 oldxps = xprt_iter_xchg_switch(&clnt->cl_xpi, xps);
733
734 rpc_unregister_client(clnt);
735 __rpc_clnt_remove_pipedir(clnt);
736 rpc_clnt_debugfs_unregister(clnt);
737
738
739
740
741
742
743 parent = clnt->cl_parent;
744 clnt->cl_parent = clnt;
745
746
747
748
749
750
751 err = rpc_client_register(clnt, pseudoflavor, NULL);
752 if (err)
753 goto out_revert;
754
755 synchronize_rcu();
756 if (parent != clnt)
757 rpc_release_client(parent);
758 xprt_switch_put(oldxps);
759 xprt_put(old);
760 trace_rpc_clnt_replace_xprt(clnt);
761 return 0;
762
763out_revert:
764 xps = xprt_iter_xchg_switch(&clnt->cl_xpi, oldxps);
765 rpc_clnt_set_transport(clnt, old, old_timeo);
766 clnt->cl_parent = parent;
767 rpc_client_register(clnt, pseudoflavor, NULL);
768 xprt_switch_put(xps);
769 xprt_put(xprt);
770 trace_rpc_clnt_replace_xprt_err(clnt);
771 return err;
772}
773EXPORT_SYMBOL_GPL(rpc_switch_client_transport);
774
775static
776int rpc_clnt_xprt_iter_init(struct rpc_clnt *clnt, struct rpc_xprt_iter *xpi)
777{
778 struct rpc_xprt_switch *xps;
779
780 rcu_read_lock();
781 xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch));
782 rcu_read_unlock();
783 if (xps == NULL)
784 return -EAGAIN;
785 xprt_iter_init_listall(xpi, xps);
786 xprt_switch_put(xps);
787 return 0;
788}
789
790
791
792
793
794
795
796
797
798
799
800
801int rpc_clnt_iterate_for_each_xprt(struct rpc_clnt *clnt,
802 int (*fn)(struct rpc_clnt *, struct rpc_xprt *, void *),
803 void *data)
804{
805 struct rpc_xprt_iter xpi;
806 int ret;
807
808 ret = rpc_clnt_xprt_iter_init(clnt, &xpi);
809 if (ret)
810 return ret;
811 for (;;) {
812 struct rpc_xprt *xprt = xprt_iter_get_next(&xpi);
813
814 if (!xprt)
815 break;
816 ret = fn(clnt, xprt, data);
817 xprt_put(xprt);
818 if (ret < 0)
819 break;
820 }
821 xprt_iter_destroy(&xpi);
822 return ret;
823}
824EXPORT_SYMBOL_GPL(rpc_clnt_iterate_for_each_xprt);
825
826
827
828
829
830void rpc_killall_tasks(struct rpc_clnt *clnt)
831{
832 struct rpc_task *rovr;
833
834
835 if (list_empty(&clnt->cl_tasks))
836 return;
837
838
839
840
841 trace_rpc_clnt_killall(clnt);
842 spin_lock(&clnt->cl_lock);
843 list_for_each_entry(rovr, &clnt->cl_tasks, tk_task)
844 rpc_signal_task(rovr);
845 spin_unlock(&clnt->cl_lock);
846}
847EXPORT_SYMBOL_GPL(rpc_killall_tasks);
848
849
850
851
852
853void rpc_shutdown_client(struct rpc_clnt *clnt)
854{
855 might_sleep();
856
857 trace_rpc_clnt_shutdown(clnt);
858
859 while (!list_empty(&clnt->cl_tasks)) {
860 rpc_killall_tasks(clnt);
861 wait_event_timeout(destroy_wait,
862 list_empty(&clnt->cl_tasks), 1*HZ);
863 }
864
865 rpc_release_client(clnt);
866}
867EXPORT_SYMBOL_GPL(rpc_shutdown_client);
868
869
870
871
872static void rpc_free_client_work(struct work_struct *work)
873{
874 struct rpc_clnt *clnt = container_of(work, struct rpc_clnt, cl_work);
875
876 trace_rpc_clnt_free(clnt);
877
878
879
880
881
882 rpc_clnt_debugfs_unregister(clnt);
883 rpc_free_clid(clnt);
884 rpc_clnt_remove_pipedir(clnt);
885 xprt_put(rcu_dereference_raw(clnt->cl_xprt));
886
887 kfree(clnt);
888 rpciod_down();
889}
890static struct rpc_clnt *
891rpc_free_client(struct rpc_clnt *clnt)
892{
893 struct rpc_clnt *parent = NULL;
894
895 trace_rpc_clnt_release(clnt);
896 if (clnt->cl_parent != clnt)
897 parent = clnt->cl_parent;
898 rpc_unregister_client(clnt);
899 rpc_free_iostats(clnt->cl_metrics);
900 clnt->cl_metrics = NULL;
901 xprt_iter_destroy(&clnt->cl_xpi);
902 put_cred(clnt->cl_cred);
903
904 INIT_WORK(&clnt->cl_work, rpc_free_client_work);
905 schedule_work(&clnt->cl_work);
906 return parent;
907}
908
909
910
911
912static struct rpc_clnt *
913rpc_free_auth(struct rpc_clnt *clnt)
914{
915 if (clnt->cl_auth == NULL)
916 return rpc_free_client(clnt);
917
918
919
920
921
922
923 atomic_inc(&clnt->cl_count);
924 rpcauth_release(clnt->cl_auth);
925 clnt->cl_auth = NULL;
926 if (atomic_dec_and_test(&clnt->cl_count))
927 return rpc_free_client(clnt);
928 return NULL;
929}
930
931
932
933
934void
935rpc_release_client(struct rpc_clnt *clnt)
936{
937 do {
938 if (list_empty(&clnt->cl_tasks))
939 wake_up(&destroy_wait);
940 if (!atomic_dec_and_test(&clnt->cl_count))
941 break;
942 clnt = rpc_free_auth(clnt);
943 } while (clnt != NULL);
944}
945EXPORT_SYMBOL_GPL(rpc_release_client);
946
947
948
949
950
951
952
953
954
955
956
957struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old,
958 const struct rpc_program *program,
959 u32 vers)
960{
961 struct rpc_create_args args = {
962 .program = program,
963 .prognumber = program->number,
964 .version = vers,
965 .authflavor = old->cl_auth->au_flavor,
966 .cred = old->cl_cred,
967 };
968 struct rpc_clnt *clnt;
969 int err;
970
971 clnt = __rpc_clone_client(&args, old);
972 if (IS_ERR(clnt))
973 goto out;
974 err = rpc_ping(clnt);
975 if (err != 0) {
976 rpc_shutdown_client(clnt);
977 clnt = ERR_PTR(err);
978 }
979out:
980 return clnt;
981}
982EXPORT_SYMBOL_GPL(rpc_bind_new_program);
983
984struct rpc_xprt *
985rpc_task_get_xprt(struct rpc_clnt *clnt, struct rpc_xprt *xprt)
986{
987 struct rpc_xprt_switch *xps;
988
989 if (!xprt)
990 return NULL;
991 rcu_read_lock();
992 xps = rcu_dereference(clnt->cl_xpi.xpi_xpswitch);
993 atomic_long_inc(&xps->xps_queuelen);
994 rcu_read_unlock();
995 atomic_long_inc(&xprt->queuelen);
996
997 return xprt;
998}
999
1000static void
1001rpc_task_release_xprt(struct rpc_clnt *clnt, struct rpc_xprt *xprt)
1002{
1003 struct rpc_xprt_switch *xps;
1004
1005 atomic_long_dec(&xprt->queuelen);
1006 rcu_read_lock();
1007 xps = rcu_dereference(clnt->cl_xpi.xpi_xpswitch);
1008 atomic_long_dec(&xps->xps_queuelen);
1009 rcu_read_unlock();
1010
1011 xprt_put(xprt);
1012}
1013
1014void rpc_task_release_transport(struct rpc_task *task)
1015{
1016 struct rpc_xprt *xprt = task->tk_xprt;
1017
1018 if (xprt) {
1019 task->tk_xprt = NULL;
1020 if (task->tk_client)
1021 rpc_task_release_xprt(task->tk_client, xprt);
1022 else
1023 xprt_put(xprt);
1024 }
1025}
1026EXPORT_SYMBOL_GPL(rpc_task_release_transport);
1027
1028void rpc_task_release_client(struct rpc_task *task)
1029{
1030 struct rpc_clnt *clnt = task->tk_client;
1031
1032 rpc_task_release_transport(task);
1033 if (clnt != NULL) {
1034
1035 spin_lock(&clnt->cl_lock);
1036 list_del(&task->tk_task);
1037 spin_unlock(&clnt->cl_lock);
1038 task->tk_client = NULL;
1039
1040 rpc_release_client(clnt);
1041 }
1042}
1043
1044static struct rpc_xprt *
1045rpc_task_get_first_xprt(struct rpc_clnt *clnt)
1046{
1047 struct rpc_xprt *xprt;
1048
1049 rcu_read_lock();
1050 xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
1051 rcu_read_unlock();
1052 return rpc_task_get_xprt(clnt, xprt);
1053}
1054
1055static struct rpc_xprt *
1056rpc_task_get_next_xprt(struct rpc_clnt *clnt)
1057{
1058 return rpc_task_get_xprt(clnt, xprt_iter_get_next(&clnt->cl_xpi));
1059}
1060
1061static
1062void rpc_task_set_transport(struct rpc_task *task, struct rpc_clnt *clnt)
1063{
1064 if (task->tk_xprt)
1065 return;
1066 if (task->tk_flags & RPC_TASK_NO_ROUND_ROBIN)
1067 task->tk_xprt = rpc_task_get_first_xprt(clnt);
1068 else
1069 task->tk_xprt = rpc_task_get_next_xprt(clnt);
1070}
1071
1072static
1073void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt)
1074{
1075
1076 if (clnt != NULL) {
1077 rpc_task_set_transport(task, clnt);
1078 task->tk_client = clnt;
1079 atomic_inc(&clnt->cl_count);
1080 if (clnt->cl_softrtry)
1081 task->tk_flags |= RPC_TASK_SOFT;
1082 if (clnt->cl_softerr)
1083 task->tk_flags |= RPC_TASK_TIMEOUT;
1084 if (clnt->cl_noretranstimeo)
1085 task->tk_flags |= RPC_TASK_NO_RETRANS_TIMEOUT;
1086 if (atomic_read(&clnt->cl_swapper))
1087 task->tk_flags |= RPC_TASK_SWAPPER;
1088
1089 spin_lock(&clnt->cl_lock);
1090 list_add_tail(&task->tk_task, &clnt->cl_tasks);
1091 spin_unlock(&clnt->cl_lock);
1092 }
1093}
1094
1095static void
1096rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg)
1097{
1098 if (msg != NULL) {
1099 task->tk_msg.rpc_proc = msg->rpc_proc;
1100 task->tk_msg.rpc_argp = msg->rpc_argp;
1101 task->tk_msg.rpc_resp = msg->rpc_resp;
1102 task->tk_msg.rpc_cred = msg->rpc_cred;
1103 if (!(task->tk_flags & RPC_TASK_CRED_NOREF))
1104 get_cred(task->tk_msg.rpc_cred);
1105 }
1106}
1107
1108
1109
1110
1111static void
1112rpc_default_callback(struct rpc_task *task, void *data)
1113{
1114}
1115
1116static const struct rpc_call_ops rpc_default_ops = {
1117 .rpc_call_done = rpc_default_callback,
1118};
1119
1120
1121
1122
1123
1124struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data)
1125{
1126 struct rpc_task *task;
1127
1128 task = rpc_new_task(task_setup_data);
1129
1130 if (!RPC_IS_ASYNC(task))
1131 task->tk_flags |= RPC_TASK_CRED_NOREF;
1132
1133 rpc_task_set_client(task, task_setup_data->rpc_client);
1134 rpc_task_set_rpc_message(task, task_setup_data->rpc_message);
1135
1136 if (task->tk_action == NULL)
1137 rpc_call_start(task);
1138
1139 atomic_inc(&task->tk_count);
1140 rpc_execute(task);
1141 return task;
1142}
1143EXPORT_SYMBOL_GPL(rpc_run_task);
1144
1145
1146
1147
1148
1149
1150
1151int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags)
1152{
1153 struct rpc_task *task;
1154 struct rpc_task_setup task_setup_data = {
1155 .rpc_client = clnt,
1156 .rpc_message = msg,
1157 .callback_ops = &rpc_default_ops,
1158 .flags = flags,
1159 };
1160 int status;
1161
1162 WARN_ON_ONCE(flags & RPC_TASK_ASYNC);
1163 if (flags & RPC_TASK_ASYNC) {
1164 rpc_release_calldata(task_setup_data.callback_ops,
1165 task_setup_data.callback_data);
1166 return -EINVAL;
1167 }
1168
1169 task = rpc_run_task(&task_setup_data);
1170 if (IS_ERR(task))
1171 return PTR_ERR(task);
1172 status = task->tk_status;
1173 rpc_put_task(task);
1174 return status;
1175}
1176EXPORT_SYMBOL_GPL(rpc_call_sync);
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186int
1187rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags,
1188 const struct rpc_call_ops *tk_ops, void *data)
1189{
1190 struct rpc_task *task;
1191 struct rpc_task_setup task_setup_data = {
1192 .rpc_client = clnt,
1193 .rpc_message = msg,
1194 .callback_ops = tk_ops,
1195 .callback_data = data,
1196 .flags = flags|RPC_TASK_ASYNC,
1197 };
1198
1199 task = rpc_run_task(&task_setup_data);
1200 if (IS_ERR(task))
1201 return PTR_ERR(task);
1202 rpc_put_task(task);
1203 return 0;
1204}
1205EXPORT_SYMBOL_GPL(rpc_call_async);
1206
1207#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1208static void call_bc_encode(struct rpc_task *task);
1209
1210
1211
1212
1213
1214
1215struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req)
1216{
1217 struct rpc_task *task;
1218 struct rpc_task_setup task_setup_data = {
1219 .callback_ops = &rpc_default_ops,
1220 .flags = RPC_TASK_SOFTCONN |
1221 RPC_TASK_NO_RETRANS_TIMEOUT,
1222 };
1223
1224 dprintk("RPC: rpc_run_bc_task req= %p\n", req);
1225
1226
1227
1228 task = rpc_new_task(&task_setup_data);
1229 xprt_init_bc_request(req, task);
1230
1231 task->tk_action = call_bc_encode;
1232 atomic_inc(&task->tk_count);
1233 WARN_ON_ONCE(atomic_read(&task->tk_count) != 2);
1234 rpc_execute(task);
1235
1236 dprintk("RPC: rpc_run_bc_task: task= %p\n", task);
1237 return task;
1238}
1239#endif
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250void rpc_prepare_reply_pages(struct rpc_rqst *req, struct page **pages,
1251 unsigned int base, unsigned int len,
1252 unsigned int hdrsize)
1253{
1254
1255
1256
1257 hdrsize += RPC_REPHDRSIZE + req->rq_cred->cr_auth->au_ralign - 1;
1258
1259 xdr_inline_pages(&req->rq_rcv_buf, hdrsize << 2, pages, base, len);
1260 trace_rpc_xdr_reply_pages(req->rq_task, &req->rq_rcv_buf);
1261}
1262EXPORT_SYMBOL_GPL(rpc_prepare_reply_pages);
1263
1264void
1265rpc_call_start(struct rpc_task *task)
1266{
1267 task->tk_action = call_start;
1268}
1269EXPORT_SYMBOL_GPL(rpc_call_start);
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize)
1280{
1281 size_t bytes;
1282 struct rpc_xprt *xprt;
1283
1284 rcu_read_lock();
1285 xprt = rcu_dereference(clnt->cl_xprt);
1286
1287 bytes = xprt->addrlen;
1288 if (bytes > bufsize)
1289 bytes = bufsize;
1290 memcpy(buf, &xprt->addr, bytes);
1291 rcu_read_unlock();
1292
1293 return bytes;
1294}
1295EXPORT_SYMBOL_GPL(rpc_peeraddr);
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306const char *rpc_peeraddr2str(struct rpc_clnt *clnt,
1307 enum rpc_display_format_t format)
1308{
1309 struct rpc_xprt *xprt;
1310
1311 xprt = rcu_dereference(clnt->cl_xprt);
1312
1313 if (xprt->address_strings[format] != NULL)
1314 return xprt->address_strings[format];
1315 else
1316 return "unprintable";
1317}
1318EXPORT_SYMBOL_GPL(rpc_peeraddr2str);
1319
1320static const struct sockaddr_in rpc_inaddr_loopback = {
1321 .sin_family = AF_INET,
1322 .sin_addr.s_addr = htonl(INADDR_ANY),
1323};
1324
1325static const struct sockaddr_in6 rpc_in6addr_loopback = {
1326 .sin6_family = AF_INET6,
1327 .sin6_addr = IN6ADDR_ANY_INIT,
1328};
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338static int rpc_sockname(struct net *net, struct sockaddr *sap, size_t salen,
1339 struct sockaddr *buf)
1340{
1341 struct socket *sock;
1342 int err;
1343
1344 err = __sock_create(net, sap->sa_family,
1345 SOCK_DGRAM, IPPROTO_UDP, &sock, 1);
1346 if (err < 0) {
1347 dprintk("RPC: can't create UDP socket (%d)\n", err);
1348 goto out;
1349 }
1350
1351 switch (sap->sa_family) {
1352 case AF_INET:
1353 err = kernel_bind(sock,
1354 (struct sockaddr *)&rpc_inaddr_loopback,
1355 sizeof(rpc_inaddr_loopback));
1356 break;
1357 case AF_INET6:
1358 err = kernel_bind(sock,
1359 (struct sockaddr *)&rpc_in6addr_loopback,
1360 sizeof(rpc_in6addr_loopback));
1361 break;
1362 default:
1363 err = -EAFNOSUPPORT;
1364 goto out;
1365 }
1366 if (err < 0) {
1367 dprintk("RPC: can't bind UDP socket (%d)\n", err);
1368 goto out_release;
1369 }
1370
1371 err = kernel_connect(sock, sap, salen, 0);
1372 if (err < 0) {
1373 dprintk("RPC: can't connect UDP socket (%d)\n", err);
1374 goto out_release;
1375 }
1376
1377 err = kernel_getsockname(sock, buf);
1378 if (err < 0) {
1379 dprintk("RPC: getsockname failed (%d)\n", err);
1380 goto out_release;
1381 }
1382
1383 err = 0;
1384 if (buf->sa_family == AF_INET6) {
1385 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)buf;
1386 sin6->sin6_scope_id = 0;
1387 }
1388 dprintk("RPC: %s succeeded\n", __func__);
1389
1390out_release:
1391 sock_release(sock);
1392out:
1393 return err;
1394}
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404static int rpc_anyaddr(int family, struct sockaddr *buf, size_t buflen)
1405{
1406 switch (family) {
1407 case AF_INET:
1408 if (buflen < sizeof(rpc_inaddr_loopback))
1409 return -EINVAL;
1410 memcpy(buf, &rpc_inaddr_loopback,
1411 sizeof(rpc_inaddr_loopback));
1412 break;
1413 case AF_INET6:
1414 if (buflen < sizeof(rpc_in6addr_loopback))
1415 return -EINVAL;
1416 memcpy(buf, &rpc_in6addr_loopback,
1417 sizeof(rpc_in6addr_loopback));
1418 break;
1419 default:
1420 dprintk("RPC: %s: address family not supported\n",
1421 __func__);
1422 return -EAFNOSUPPORT;
1423 }
1424 dprintk("RPC: %s: succeeded\n", __func__);
1425 return 0;
1426}
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444int rpc_localaddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t buflen)
1445{
1446 struct sockaddr_storage address;
1447 struct sockaddr *sap = (struct sockaddr *)&address;
1448 struct rpc_xprt *xprt;
1449 struct net *net;
1450 size_t salen;
1451 int err;
1452
1453 rcu_read_lock();
1454 xprt = rcu_dereference(clnt->cl_xprt);
1455 salen = xprt->addrlen;
1456 memcpy(sap, &xprt->addr, salen);
1457 net = get_net(xprt->xprt_net);
1458 rcu_read_unlock();
1459
1460 rpc_set_port(sap, 0);
1461 err = rpc_sockname(net, sap, salen, buf);
1462 put_net(net);
1463 if (err != 0)
1464
1465 return rpc_anyaddr(sap->sa_family, buf, buflen);
1466 return 0;
1467}
1468EXPORT_SYMBOL_GPL(rpc_localaddr);
1469
1470void
1471rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize)
1472{
1473 struct rpc_xprt *xprt;
1474
1475 rcu_read_lock();
1476 xprt = rcu_dereference(clnt->cl_xprt);
1477 if (xprt->ops->set_buffer_size)
1478 xprt->ops->set_buffer_size(xprt, sndsize, rcvsize);
1479 rcu_read_unlock();
1480}
1481EXPORT_SYMBOL_GPL(rpc_setbufsize);
1482
1483
1484
1485
1486
1487
1488struct net *rpc_net_ns(struct rpc_clnt *clnt)
1489{
1490 struct net *ret;
1491
1492 rcu_read_lock();
1493 ret = rcu_dereference(clnt->cl_xprt)->xprt_net;
1494 rcu_read_unlock();
1495 return ret;
1496}
1497EXPORT_SYMBOL_GPL(rpc_net_ns);
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508size_t rpc_max_payload(struct rpc_clnt *clnt)
1509{
1510 size_t ret;
1511
1512 rcu_read_lock();
1513 ret = rcu_dereference(clnt->cl_xprt)->max_payload;
1514 rcu_read_unlock();
1515 return ret;
1516}
1517EXPORT_SYMBOL_GPL(rpc_max_payload);
1518
1519
1520
1521
1522
1523size_t rpc_max_bc_payload(struct rpc_clnt *clnt)
1524{
1525 struct rpc_xprt *xprt;
1526 size_t ret;
1527
1528 rcu_read_lock();
1529 xprt = rcu_dereference(clnt->cl_xprt);
1530 ret = xprt->ops->bc_maxpayload(xprt);
1531 rcu_read_unlock();
1532 return ret;
1533}
1534EXPORT_SYMBOL_GPL(rpc_max_bc_payload);
1535
1536unsigned int rpc_num_bc_slots(struct rpc_clnt *clnt)
1537{
1538 struct rpc_xprt *xprt;
1539 unsigned int ret;
1540
1541 rcu_read_lock();
1542 xprt = rcu_dereference(clnt->cl_xprt);
1543 ret = xprt->ops->bc_num_slots(xprt);
1544 rcu_read_unlock();
1545 return ret;
1546}
1547EXPORT_SYMBOL_GPL(rpc_num_bc_slots);
1548
1549
1550
1551
1552
1553
1554void rpc_force_rebind(struct rpc_clnt *clnt)
1555{
1556 if (clnt->cl_autobind) {
1557 rcu_read_lock();
1558 xprt_clear_bound(rcu_dereference(clnt->cl_xprt));
1559 rcu_read_unlock();
1560 }
1561}
1562EXPORT_SYMBOL_GPL(rpc_force_rebind);
1563
1564static int
1565__rpc_restart_call(struct rpc_task *task, void (*action)(struct rpc_task *))
1566{
1567 task->tk_status = 0;
1568 task->tk_rpc_status = 0;
1569 task->tk_action = action;
1570 return 1;
1571}
1572
1573
1574
1575
1576
1577int
1578rpc_restart_call(struct rpc_task *task)
1579{
1580 return __rpc_restart_call(task, call_start);
1581}
1582EXPORT_SYMBOL_GPL(rpc_restart_call);
1583
1584
1585
1586
1587
1588int
1589rpc_restart_call_prepare(struct rpc_task *task)
1590{
1591 if (task->tk_ops->rpc_call_prepare != NULL)
1592 return __rpc_restart_call(task, rpc_prepare_task);
1593 return rpc_restart_call(task);
1594}
1595EXPORT_SYMBOL_GPL(rpc_restart_call_prepare);
1596
1597const char
1598*rpc_proc_name(const struct rpc_task *task)
1599{
1600 const struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
1601
1602 if (proc) {
1603 if (proc->p_name)
1604 return proc->p_name;
1605 else
1606 return "NULL";
1607 } else
1608 return "no proc";
1609}
1610
1611static void
1612__rpc_call_rpcerror(struct rpc_task *task, int tk_status, int rpc_status)
1613{
1614 trace_rpc_call_rpcerror(task, tk_status, rpc_status);
1615 task->tk_rpc_status = rpc_status;
1616 rpc_exit(task, tk_status);
1617}
1618
1619static void
1620rpc_call_rpcerror(struct rpc_task *task, int status)
1621{
1622 __rpc_call_rpcerror(task, status, status);
1623}
1624
1625
1626
1627
1628
1629
1630
1631static void
1632call_start(struct rpc_task *task)
1633{
1634 struct rpc_clnt *clnt = task->tk_client;
1635 int idx = task->tk_msg.rpc_proc->p_statidx;
1636
1637 trace_rpc_request(task);
1638
1639
1640 if (clnt->cl_program->version[clnt->cl_vers])
1641 clnt->cl_program->version[clnt->cl_vers]->counts[idx]++;
1642 clnt->cl_stats->rpccnt++;
1643 task->tk_action = call_reserve;
1644 rpc_task_set_transport(task, clnt);
1645}
1646
1647
1648
1649
1650static void
1651call_reserve(struct rpc_task *task)
1652{
1653 task->tk_status = 0;
1654 task->tk_action = call_reserveresult;
1655 xprt_reserve(task);
1656}
1657
1658static void call_retry_reserve(struct rpc_task *task);
1659
1660
1661
1662
1663static void
1664call_reserveresult(struct rpc_task *task)
1665{
1666 int status = task->tk_status;
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 rpc_call_rpcerror(task, -EIO);
1680 return;
1681 }
1682
1683
1684
1685
1686
1687 if (task->tk_rqstp)
1688 xprt_release(task);
1689
1690 switch (status) {
1691 case -ENOMEM:
1692 rpc_delay(task, HZ >> 2);
1693 fallthrough;
1694 case -EAGAIN:
1695 task->tk_action = call_retry_reserve;
1696 return;
1697 default:
1698 rpc_call_rpcerror(task, status);
1699 }
1700}
1701
1702
1703
1704
1705static void
1706call_retry_reserve(struct rpc_task *task)
1707{
1708 task->tk_status = 0;
1709 task->tk_action = call_reserveresult;
1710 xprt_retry_reserve(task);
1711}
1712
1713
1714
1715
1716static void
1717call_refresh(struct rpc_task *task)
1718{
1719 task->tk_action = call_refreshresult;
1720 task->tk_status = 0;
1721 task->tk_client->cl_stats->rpcauthrefresh++;
1722 rpcauth_refreshcred(task);
1723}
1724
1725
1726
1727
1728static void
1729call_refreshresult(struct rpc_task *task)
1730{
1731 int status = task->tk_status;
1732
1733 task->tk_status = 0;
1734 task->tk_action = call_refresh;
1735 switch (status) {
1736 case 0:
1737 if (rpcauth_uptodatecred(task)) {
1738 task->tk_action = call_allocate;
1739 return;
1740 }
1741
1742
1743
1744 fallthrough;
1745 case -ETIMEDOUT:
1746 rpc_delay(task, 3*HZ);
1747 fallthrough;
1748 case -EAGAIN:
1749 status = -EACCES;
1750 fallthrough;
1751 case -EKEYEXPIRED:
1752 if (!task->tk_cred_retry)
1753 break;
1754 task->tk_cred_retry--;
1755 trace_rpc_retry_refresh_status(task);
1756 return;
1757 }
1758 trace_rpc_refresh_status(task);
1759 rpc_call_rpcerror(task, status);
1760}
1761
1762
1763
1764
1765
1766static void
1767call_allocate(struct rpc_task *task)
1768{
1769 const struct rpc_auth *auth = task->tk_rqstp->rq_cred->cr_auth;
1770 struct rpc_rqst *req = task->tk_rqstp;
1771 struct rpc_xprt *xprt = req->rq_xprt;
1772 const struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
1773 int status;
1774
1775 task->tk_status = 0;
1776 task->tk_action = call_encode;
1777
1778 if (req->rq_buffer)
1779 return;
1780
1781 if (proc->p_proc != 0) {
1782 BUG_ON(proc->p_arglen == 0);
1783 if (proc->p_decode != NULL)
1784 BUG_ON(proc->p_replen == 0);
1785 }
1786
1787
1788
1789
1790
1791
1792 req->rq_callsize = RPC_CALLHDRSIZE + (auth->au_cslack << 1) +
1793 proc->p_arglen;
1794 req->rq_callsize <<= 2;
1795
1796
1797
1798
1799 req->rq_rcvsize = RPC_REPHDRSIZE + auth->au_rslack + \
1800 max_t(size_t, proc->p_replen, 2);
1801 req->rq_rcvsize <<= 2;
1802
1803 status = xprt->ops->buf_alloc(task);
1804 trace_rpc_buf_alloc(task, status);
1805 xprt_inject_disconnect(xprt);
1806 if (status == 0)
1807 return;
1808 if (status != -ENOMEM) {
1809 rpc_call_rpcerror(task, status);
1810 return;
1811 }
1812
1813 if (RPC_IS_ASYNC(task) || !fatal_signal_pending(current)) {
1814 task->tk_action = call_allocate;
1815 rpc_delay(task, HZ>>4);
1816 return;
1817 }
1818
1819 rpc_call_rpcerror(task, -ERESTARTSYS);
1820}
1821
1822static int
1823rpc_task_need_encode(struct rpc_task *task)
1824{
1825 return test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate) == 0 &&
1826 (!(task->tk_flags & RPC_TASK_SENT) ||
1827 !(task->tk_flags & RPC_TASK_NO_RETRANS_TIMEOUT) ||
1828 xprt_request_need_retransmit(task));
1829}
1830
1831static void
1832rpc_xdr_encode(struct rpc_task *task)
1833{
1834 struct rpc_rqst *req = task->tk_rqstp;
1835 struct xdr_stream xdr;
1836
1837 xdr_buf_init(&req->rq_snd_buf,
1838 req->rq_buffer,
1839 req->rq_callsize);
1840 xdr_buf_init(&req->rq_rcv_buf,
1841 req->rq_rbuffer,
1842 req->rq_rcvsize);
1843
1844 req->rq_reply_bytes_recvd = 0;
1845 req->rq_snd_buf.head[0].iov_len = 0;
1846 xdr_init_encode(&xdr, &req->rq_snd_buf,
1847 req->rq_snd_buf.head[0].iov_base, req);
1848 xdr_free_bvec(&req->rq_snd_buf);
1849 if (rpc_encode_header(task, &xdr))
1850 return;
1851
1852 task->tk_status = rpcauth_wrap_req(task, &xdr);
1853}
1854
1855
1856
1857
1858static void
1859call_encode(struct rpc_task *task)
1860{
1861 if (!rpc_task_need_encode(task))
1862 goto out;
1863
1864
1865 xprt_request_dequeue_xprt(task);
1866
1867 rpc_xdr_encode(task);
1868
1869 if (task->tk_status != 0) {
1870
1871 switch (task->tk_status) {
1872 case -EAGAIN:
1873 case -ENOMEM:
1874 rpc_delay(task, HZ >> 4);
1875 break;
1876 case -EKEYEXPIRED:
1877 if (!task->tk_cred_retry) {
1878 rpc_exit(task, task->tk_status);
1879 } else {
1880 task->tk_action = call_refresh;
1881 task->tk_cred_retry--;
1882 trace_rpc_retry_refresh_status(task);
1883 }
1884 break;
1885 default:
1886 rpc_call_rpcerror(task, task->tk_status);
1887 }
1888 return;
1889 }
1890
1891
1892 if (rpc_reply_expected(task))
1893 xprt_request_enqueue_receive(task);
1894 xprt_request_enqueue_transmit(task);
1895out:
1896 task->tk_action = call_transmit;
1897
1898 if (!xprt_bound(task->tk_xprt))
1899 task->tk_action = call_bind;
1900 else if (!xprt_connected(task->tk_xprt))
1901 task->tk_action = call_connect;
1902}
1903
1904
1905
1906
1907
1908static bool
1909rpc_task_transmitted(struct rpc_task *task)
1910{
1911 return !test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate);
1912}
1913
1914static void
1915rpc_task_handle_transmitted(struct rpc_task *task)
1916{
1917 xprt_end_transmit(task);
1918 task->tk_action = call_transmit_status;
1919}
1920
1921
1922
1923
1924static void
1925call_bind(struct rpc_task *task)
1926{
1927 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
1928
1929 if (rpc_task_transmitted(task)) {
1930 rpc_task_handle_transmitted(task);
1931 return;
1932 }
1933
1934 if (xprt_bound(xprt)) {
1935 task->tk_action = call_connect;
1936 return;
1937 }
1938
1939 task->tk_action = call_bind_status;
1940 if (!xprt_prepare_transmit(task))
1941 return;
1942
1943 xprt->ops->rpcbind(task);
1944}
1945
1946
1947
1948
1949static void
1950call_bind_status(struct rpc_task *task)
1951{
1952 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
1953 int status = -EIO;
1954
1955 if (rpc_task_transmitted(task)) {
1956 rpc_task_handle_transmitted(task);
1957 return;
1958 }
1959
1960 if (task->tk_status >= 0)
1961 goto out_next;
1962 if (xprt_bound(xprt)) {
1963 task->tk_status = 0;
1964 goto out_next;
1965 }
1966
1967 switch (task->tk_status) {
1968 case -ENOMEM:
1969 rpc_delay(task, HZ >> 2);
1970 goto retry_timeout;
1971 case -EACCES:
1972 trace_rpcb_prog_unavail_err(task);
1973
1974 if (task->tk_msg.rpc_proc->p_proc == 0) {
1975 status = -EOPNOTSUPP;
1976 break;
1977 }
1978 if (task->tk_rebind_retry == 0)
1979 break;
1980 task->tk_rebind_retry--;
1981 rpc_delay(task, 3*HZ);
1982 goto retry_timeout;
1983 case -ENOBUFS:
1984 rpc_delay(task, HZ >> 2);
1985 goto retry_timeout;
1986 case -EAGAIN:
1987 goto retry_timeout;
1988 case -ETIMEDOUT:
1989 trace_rpcb_timeout_err(task);
1990 goto retry_timeout;
1991 case -EPFNOSUPPORT:
1992
1993 trace_rpcb_bind_version_err(task);
1994 break;
1995 case -EPROTONOSUPPORT:
1996 trace_rpcb_bind_version_err(task);
1997 goto retry_timeout;
1998 case -ECONNREFUSED:
1999 case -ECONNRESET:
2000 case -ECONNABORTED:
2001 case -ENOTCONN:
2002 case -EHOSTDOWN:
2003 case -ENETDOWN:
2004 case -EHOSTUNREACH:
2005 case -ENETUNREACH:
2006 case -EPIPE:
2007 trace_rpcb_unreachable_err(task);
2008 if (!RPC_IS_SOFTCONN(task)) {
2009 rpc_delay(task, 5*HZ);
2010 goto retry_timeout;
2011 }
2012 status = task->tk_status;
2013 break;
2014 default:
2015 trace_rpcb_unrecognized_err(task);
2016 }
2017
2018 rpc_call_rpcerror(task, status);
2019 return;
2020out_next:
2021 task->tk_action = call_connect;
2022 return;
2023retry_timeout:
2024 task->tk_status = 0;
2025 task->tk_action = call_bind;
2026 rpc_check_timeout(task);
2027}
2028
2029
2030
2031
2032static void
2033call_connect(struct rpc_task *task)
2034{
2035 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
2036
2037 if (rpc_task_transmitted(task)) {
2038 rpc_task_handle_transmitted(task);
2039 return;
2040 }
2041
2042 if (xprt_connected(xprt)) {
2043 task->tk_action = call_transmit;
2044 return;
2045 }
2046
2047 task->tk_action = call_connect_status;
2048 if (task->tk_status < 0)
2049 return;
2050 if (task->tk_flags & RPC_TASK_NOCONNECT) {
2051 rpc_call_rpcerror(task, -ENOTCONN);
2052 return;
2053 }
2054 if (!xprt_prepare_transmit(task))
2055 return;
2056 xprt_connect(task);
2057}
2058
2059
2060
2061
2062static void
2063call_connect_status(struct rpc_task *task)
2064{
2065 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
2066 struct rpc_clnt *clnt = task->tk_client;
2067 int status = task->tk_status;
2068
2069 if (rpc_task_transmitted(task)) {
2070 rpc_task_handle_transmitted(task);
2071 return;
2072 }
2073
2074 trace_rpc_connect_status(task);
2075
2076 if (task->tk_status == 0) {
2077 clnt->cl_stats->netreconn++;
2078 goto out_next;
2079 }
2080 if (xprt_connected(xprt)) {
2081 task->tk_status = 0;
2082 goto out_next;
2083 }
2084
2085 task->tk_status = 0;
2086 switch (status) {
2087 case -ECONNREFUSED:
2088
2089 if (RPC_IS_SOFTCONN(task))
2090 break;
2091 if (clnt->cl_autobind) {
2092 rpc_force_rebind(clnt);
2093 goto out_retry;
2094 }
2095 fallthrough;
2096 case -ECONNRESET:
2097 case -ECONNABORTED:
2098 case -ENETDOWN:
2099 case -ENETUNREACH:
2100 case -EHOSTUNREACH:
2101 case -EPIPE:
2102 case -EPROTO:
2103 xprt_conditional_disconnect(task->tk_rqstp->rq_xprt,
2104 task->tk_rqstp->rq_connect_cookie);
2105 if (RPC_IS_SOFTCONN(task))
2106 break;
2107
2108 rpc_delay(task, 3*HZ);
2109 fallthrough;
2110 case -EADDRINUSE:
2111 case -ENOTCONN:
2112 case -EAGAIN:
2113 case -ETIMEDOUT:
2114 goto out_retry;
2115 case -ENOBUFS:
2116 rpc_delay(task, HZ >> 2);
2117 goto out_retry;
2118 }
2119 rpc_call_rpcerror(task, status);
2120 return;
2121out_next:
2122 task->tk_action = call_transmit;
2123 return;
2124out_retry:
2125
2126 task->tk_action = call_bind;
2127 rpc_check_timeout(task);
2128}
2129
2130
2131
2132
2133static void
2134call_transmit(struct rpc_task *task)
2135{
2136 if (rpc_task_transmitted(task)) {
2137 rpc_task_handle_transmitted(task);
2138 return;
2139 }
2140
2141 task->tk_action = call_transmit_status;
2142 if (!xprt_prepare_transmit(task))
2143 return;
2144 task->tk_status = 0;
2145 if (test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate)) {
2146 if (!xprt_connected(task->tk_xprt)) {
2147 task->tk_status = -ENOTCONN;
2148 return;
2149 }
2150 xprt_transmit(task);
2151 }
2152 xprt_end_transmit(task);
2153}
2154
2155
2156
2157
2158static void
2159call_transmit_status(struct rpc_task *task)
2160{
2161 task->tk_action = call_status;
2162
2163
2164
2165
2166
2167 if (rpc_task_transmitted(task)) {
2168 task->tk_status = 0;
2169 xprt_request_wait_receive(task);
2170 return;
2171 }
2172
2173 switch (task->tk_status) {
2174 default:
2175 break;
2176 case -EBADMSG:
2177 task->tk_status = 0;
2178 task->tk_action = call_encode;
2179 break;
2180
2181
2182
2183
2184
2185
2186 case -ENOBUFS:
2187 rpc_delay(task, HZ>>2);
2188 fallthrough;
2189 case -EBADSLT:
2190 case -EAGAIN:
2191 task->tk_action = call_transmit;
2192 task->tk_status = 0;
2193 break;
2194 case -ECONNREFUSED:
2195 case -EHOSTDOWN:
2196 case -ENETDOWN:
2197 case -EHOSTUNREACH:
2198 case -ENETUNREACH:
2199 case -EPERM:
2200 if (RPC_IS_SOFTCONN(task)) {
2201 if (!task->tk_msg.rpc_proc->p_proc)
2202 trace_xprt_ping(task->tk_xprt,
2203 task->tk_status);
2204 rpc_call_rpcerror(task, task->tk_status);
2205 return;
2206 }
2207 fallthrough;
2208 case -ECONNRESET:
2209 case -ECONNABORTED:
2210 case -EADDRINUSE:
2211 case -ENOTCONN:
2212 case -EPIPE:
2213 task->tk_action = call_bind;
2214 task->tk_status = 0;
2215 break;
2216 }
2217 rpc_check_timeout(task);
2218}
2219
2220#if defined(CONFIG_SUNRPC_BACKCHANNEL)
2221static void call_bc_transmit(struct rpc_task *task);
2222static void call_bc_transmit_status(struct rpc_task *task);
2223
2224static void
2225call_bc_encode(struct rpc_task *task)
2226{
2227 xprt_request_enqueue_transmit(task);
2228 task->tk_action = call_bc_transmit;
2229}
2230
2231
2232
2233
2234
2235static void
2236call_bc_transmit(struct rpc_task *task)
2237{
2238 task->tk_action = call_bc_transmit_status;
2239 if (test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate)) {
2240 if (!xprt_prepare_transmit(task))
2241 return;
2242 task->tk_status = 0;
2243 xprt_transmit(task);
2244 }
2245 xprt_end_transmit(task);
2246}
2247
2248static void
2249call_bc_transmit_status(struct rpc_task *task)
2250{
2251 struct rpc_rqst *req = task->tk_rqstp;
2252
2253 if (rpc_task_transmitted(task))
2254 task->tk_status = 0;
2255
2256 switch (task->tk_status) {
2257 case 0:
2258
2259 case -ENETDOWN:
2260 case -EHOSTDOWN:
2261 case -EHOSTUNREACH:
2262 case -ENETUNREACH:
2263 case -ECONNRESET:
2264 case -ECONNREFUSED:
2265 case -EADDRINUSE:
2266 case -ENOTCONN:
2267 case -EPIPE:
2268 break;
2269 case -ENOBUFS:
2270 rpc_delay(task, HZ>>2);
2271 fallthrough;
2272 case -EBADSLT:
2273 case -EAGAIN:
2274 task->tk_status = 0;
2275 task->tk_action = call_bc_transmit;
2276 return;
2277 case -ETIMEDOUT:
2278
2279
2280
2281
2282
2283
2284
2285 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
2286 "error: %d\n", task->tk_status);
2287 xprt_conditional_disconnect(req->rq_xprt,
2288 req->rq_connect_cookie);
2289 break;
2290 default:
2291
2292
2293
2294
2295 printk(KERN_NOTICE "RPC: Could not send backchannel reply "
2296 "error: %d\n", task->tk_status);
2297 break;
2298 }
2299 task->tk_action = rpc_exit_task;
2300}
2301#endif
2302
2303
2304
2305
2306static void
2307call_status(struct rpc_task *task)
2308{
2309 struct rpc_clnt *clnt = task->tk_client;
2310 int status;
2311
2312 if (!task->tk_msg.rpc_proc->p_proc)
2313 trace_xprt_ping(task->tk_xprt, task->tk_status);
2314
2315 status = task->tk_status;
2316 if (status >= 0) {
2317 task->tk_action = call_decode;
2318 return;
2319 }
2320
2321 trace_rpc_call_status(task);
2322 task->tk_status = 0;
2323 switch(status) {
2324 case -EHOSTDOWN:
2325 case -ENETDOWN:
2326 case -EHOSTUNREACH:
2327 case -ENETUNREACH:
2328 case -EPERM:
2329 if (RPC_IS_SOFTCONN(task))
2330 goto out_exit;
2331
2332
2333
2334
2335 rpc_delay(task, 3*HZ);
2336 fallthrough;
2337 case -ETIMEDOUT:
2338 break;
2339 case -ECONNREFUSED:
2340 case -ECONNRESET:
2341 case -ECONNABORTED:
2342 case -ENOTCONN:
2343 rpc_force_rebind(clnt);
2344 break;
2345 case -EADDRINUSE:
2346 rpc_delay(task, 3*HZ);
2347 fallthrough;
2348 case -EPIPE:
2349 case -EAGAIN:
2350 break;
2351 case -EIO:
2352
2353 goto out_exit;
2354 default:
2355 if (clnt->cl_chatty)
2356 printk("%s: RPC call returned error %d\n",
2357 clnt->cl_program->name, -status);
2358 goto out_exit;
2359 }
2360 task->tk_action = call_encode;
2361 if (status != -ECONNRESET && status != -ECONNABORTED)
2362 rpc_check_timeout(task);
2363 return;
2364out_exit:
2365 rpc_call_rpcerror(task, status);
2366}
2367
2368static bool
2369rpc_check_connected(const struct rpc_rqst *req)
2370{
2371
2372 if (!req || !req->rq_xprt)
2373 return true;
2374 return xprt_connected(req->rq_xprt);
2375}
2376
2377static void
2378rpc_check_timeout(struct rpc_task *task)
2379{
2380 struct rpc_clnt *clnt = task->tk_client;
2381
2382 if (RPC_SIGNALLED(task)) {
2383 rpc_call_rpcerror(task, -ERESTARTSYS);
2384 return;
2385 }
2386
2387 if (xprt_adjust_timeout(task->tk_rqstp) == 0)
2388 return;
2389
2390 trace_rpc_timeout_status(task);
2391 task->tk_timeouts++;
2392
2393 if (RPC_IS_SOFTCONN(task) && !rpc_check_connected(task->tk_rqstp)) {
2394 rpc_call_rpcerror(task, -ETIMEDOUT);
2395 return;
2396 }
2397
2398 if (RPC_IS_SOFT(task)) {
2399
2400
2401
2402
2403
2404 if ((task->tk_flags & RPC_TASK_NO_RETRANS_TIMEOUT) &&
2405 rpc_check_connected(task->tk_rqstp))
2406 return;
2407
2408 if (clnt->cl_chatty) {
2409 pr_notice_ratelimited(
2410 "%s: server %s not responding, timed out\n",
2411 clnt->cl_program->name,
2412 task->tk_xprt->servername);
2413 }
2414 if (task->tk_flags & RPC_TASK_TIMEOUT)
2415 rpc_call_rpcerror(task, -ETIMEDOUT);
2416 else
2417 __rpc_call_rpcerror(task, -EIO, -ETIMEDOUT);
2418 return;
2419 }
2420
2421 if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) {
2422 task->tk_flags |= RPC_CALL_MAJORSEEN;
2423 if (clnt->cl_chatty) {
2424 pr_notice_ratelimited(
2425 "%s: server %s not responding, still trying\n",
2426 clnt->cl_program->name,
2427 task->tk_xprt->servername);
2428 }
2429 }
2430 rpc_force_rebind(clnt);
2431
2432
2433
2434
2435 rpcauth_invalcred(task);
2436}
2437
2438
2439
2440
2441static void
2442call_decode(struct rpc_task *task)
2443{
2444 struct rpc_clnt *clnt = task->tk_client;
2445 struct rpc_rqst *req = task->tk_rqstp;
2446 struct xdr_stream xdr;
2447 int err;
2448
2449 if (!task->tk_msg.rpc_proc->p_decode) {
2450 task->tk_action = rpc_exit_task;
2451 return;
2452 }
2453
2454 if (task->tk_flags & RPC_CALL_MAJORSEEN) {
2455 if (clnt->cl_chatty) {
2456 pr_notice_ratelimited("%s: server %s OK\n",
2457 clnt->cl_program->name,
2458 task->tk_xprt->servername);
2459 }
2460 task->tk_flags &= ~RPC_CALL_MAJORSEEN;
2461 }
2462
2463
2464
2465
2466
2467 smp_rmb();
2468
2469
2470
2471
2472
2473 err = -EAGAIN;
2474 if (!req->rq_reply_bytes_recvd)
2475 goto out;
2476
2477 req->rq_rcv_buf.len = req->rq_private_buf.len;
2478 trace_rpc_xdr_recvfrom(task, &req->rq_rcv_buf);
2479
2480
2481 WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf,
2482 sizeof(req->rq_rcv_buf)) != 0);
2483
2484 xdr_init_decode(&xdr, &req->rq_rcv_buf,
2485 req->rq_rcv_buf.head[0].iov_base, req);
2486 err = rpc_decode_header(task, &xdr);
2487out:
2488 switch (err) {
2489 case 0:
2490 task->tk_action = rpc_exit_task;
2491 task->tk_status = rpcauth_unwrap_resp(task, &xdr);
2492 return;
2493 case -EAGAIN:
2494 task->tk_status = 0;
2495 if (task->tk_client->cl_discrtry)
2496 xprt_conditional_disconnect(req->rq_xprt,
2497 req->rq_connect_cookie);
2498 task->tk_action = call_encode;
2499 rpc_check_timeout(task);
2500 break;
2501 case -EKEYREJECTED:
2502 task->tk_action = call_reserve;
2503 rpc_check_timeout(task);
2504 rpcauth_invalcred(task);
2505
2506 xprt_release(task);
2507 }
2508}
2509
2510static int
2511rpc_encode_header(struct rpc_task *task, struct xdr_stream *xdr)
2512{
2513 struct rpc_clnt *clnt = task->tk_client;
2514 struct rpc_rqst *req = task->tk_rqstp;
2515 __be32 *p;
2516 int error;
2517
2518 error = -EMSGSIZE;
2519 p = xdr_reserve_space(xdr, RPC_CALLHDRSIZE << 2);
2520 if (!p)
2521 goto out_fail;
2522 *p++ = req->rq_xid;
2523 *p++ = rpc_call;
2524 *p++ = cpu_to_be32(RPC_VERSION);
2525 *p++ = cpu_to_be32(clnt->cl_prog);
2526 *p++ = cpu_to_be32(clnt->cl_vers);
2527 *p = cpu_to_be32(task->tk_msg.rpc_proc->p_proc);
2528
2529 error = rpcauth_marshcred(task, xdr);
2530 if (error < 0)
2531 goto out_fail;
2532 return 0;
2533out_fail:
2534 trace_rpc_bad_callhdr(task);
2535 rpc_call_rpcerror(task, error);
2536 return error;
2537}
2538
2539static noinline int
2540rpc_decode_header(struct rpc_task *task, struct xdr_stream *xdr)
2541{
2542 struct rpc_clnt *clnt = task->tk_client;
2543 int error;
2544 __be32 *p;
2545
2546
2547
2548
2549
2550
2551 if (task->tk_rqstp->rq_rcv_buf.len & 3)
2552 goto out_unparsable;
2553
2554 p = xdr_inline_decode(xdr, 3 * sizeof(*p));
2555 if (!p)
2556 goto out_unparsable;
2557 p++;
2558 if (*p++ != rpc_reply)
2559 goto out_unparsable;
2560 if (*p++ != rpc_msg_accepted)
2561 goto out_msg_denied;
2562
2563 error = rpcauth_checkverf(task, xdr);
2564 if (error)
2565 goto out_verifier;
2566
2567 p = xdr_inline_decode(xdr, sizeof(*p));
2568 if (!p)
2569 goto out_unparsable;
2570 switch (*p) {
2571 case rpc_success:
2572 return 0;
2573 case rpc_prog_unavail:
2574 trace_rpc__prog_unavail(task);
2575 error = -EPFNOSUPPORT;
2576 goto out_err;
2577 case rpc_prog_mismatch:
2578 trace_rpc__prog_mismatch(task);
2579 error = -EPROTONOSUPPORT;
2580 goto out_err;
2581 case rpc_proc_unavail:
2582 trace_rpc__proc_unavail(task);
2583 error = -EOPNOTSUPP;
2584 goto out_err;
2585 case rpc_garbage_args:
2586 case rpc_system_err:
2587 trace_rpc__garbage_args(task);
2588 error = -EIO;
2589 break;
2590 default:
2591 goto out_unparsable;
2592 }
2593
2594out_garbage:
2595 clnt->cl_stats->rpcgarbage++;
2596 if (task->tk_garb_retry) {
2597 task->tk_garb_retry--;
2598 task->tk_action = call_encode;
2599 return -EAGAIN;
2600 }
2601out_err:
2602 rpc_call_rpcerror(task, error);
2603 return error;
2604
2605out_unparsable:
2606 trace_rpc__unparsable(task);
2607 error = -EIO;
2608 goto out_garbage;
2609
2610out_verifier:
2611 trace_rpc_bad_verifier(task);
2612 goto out_garbage;
2613
2614out_msg_denied:
2615 error = -EACCES;
2616 p = xdr_inline_decode(xdr, sizeof(*p));
2617 if (!p)
2618 goto out_unparsable;
2619 switch (*p++) {
2620 case rpc_auth_error:
2621 break;
2622 case rpc_mismatch:
2623 trace_rpc__mismatch(task);
2624 error = -EPROTONOSUPPORT;
2625 goto out_err;
2626 default:
2627 goto out_unparsable;
2628 }
2629
2630 p = xdr_inline_decode(xdr, sizeof(*p));
2631 if (!p)
2632 goto out_unparsable;
2633 switch (*p++) {
2634 case rpc_autherr_rejectedcred:
2635 case rpc_autherr_rejectedverf:
2636 case rpcsec_gsserr_credproblem:
2637 case rpcsec_gsserr_ctxproblem:
2638 if (!task->tk_cred_retry)
2639 break;
2640 task->tk_cred_retry--;
2641 trace_rpc__stale_creds(task);
2642 return -EKEYREJECTED;
2643 case rpc_autherr_badcred:
2644 case rpc_autherr_badverf:
2645
2646 if (!task->tk_garb_retry)
2647 break;
2648 task->tk_garb_retry--;
2649 trace_rpc__bad_creds(task);
2650 task->tk_action = call_encode;
2651 return -EAGAIN;
2652 case rpc_autherr_tooweak:
2653 trace_rpc__auth_tooweak(task);
2654 pr_warn("RPC: server %s requires stronger authentication.\n",
2655 task->tk_xprt->servername);
2656 break;
2657 default:
2658 goto out_unparsable;
2659 }
2660 goto out_err;
2661}
2662
2663static void rpcproc_encode_null(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
2664 const void *obj)
2665{
2666}
2667
2668static int rpcproc_decode_null(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
2669 void *obj)
2670{
2671 return 0;
2672}
2673
2674static const struct rpc_procinfo rpcproc_null = {
2675 .p_encode = rpcproc_encode_null,
2676 .p_decode = rpcproc_decode_null,
2677};
2678
2679static int rpc_ping(struct rpc_clnt *clnt)
2680{
2681 struct rpc_message msg = {
2682 .rpc_proc = &rpcproc_null,
2683 };
2684 int err;
2685 err = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN |
2686 RPC_TASK_NULLCREDS);
2687 return err;
2688}
2689
2690static
2691struct rpc_task *rpc_call_null_helper(struct rpc_clnt *clnt,
2692 struct rpc_xprt *xprt, struct rpc_cred *cred, int flags,
2693 const struct rpc_call_ops *ops, void *data)
2694{
2695 struct rpc_message msg = {
2696 .rpc_proc = &rpcproc_null,
2697 };
2698 struct rpc_task_setup task_setup_data = {
2699 .rpc_client = clnt,
2700 .rpc_xprt = xprt,
2701 .rpc_message = &msg,
2702 .rpc_op_cred = cred,
2703 .callback_ops = (ops != NULL) ? ops : &rpc_default_ops,
2704 .callback_data = data,
2705 .flags = flags | RPC_TASK_SOFT | RPC_TASK_SOFTCONN |
2706 RPC_TASK_NULLCREDS,
2707 };
2708
2709 return rpc_run_task(&task_setup_data);
2710}
2711
2712struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags)
2713{
2714 return rpc_call_null_helper(clnt, NULL, cred, flags, NULL, NULL);
2715}
2716EXPORT_SYMBOL_GPL(rpc_call_null);
2717
2718struct rpc_cb_add_xprt_calldata {
2719 struct rpc_xprt_switch *xps;
2720 struct rpc_xprt *xprt;
2721};
2722
2723static void rpc_cb_add_xprt_done(struct rpc_task *task, void *calldata)
2724{
2725 struct rpc_cb_add_xprt_calldata *data = calldata;
2726
2727 if (task->tk_status == 0)
2728 rpc_xprt_switch_add_xprt(data->xps, data->xprt);
2729}
2730
2731static void rpc_cb_add_xprt_release(void *calldata)
2732{
2733 struct rpc_cb_add_xprt_calldata *data = calldata;
2734
2735 xprt_put(data->xprt);
2736 xprt_switch_put(data->xps);
2737 kfree(data);
2738}
2739
2740static const struct rpc_call_ops rpc_cb_add_xprt_call_ops = {
2741 .rpc_call_done = rpc_cb_add_xprt_done,
2742 .rpc_release = rpc_cb_add_xprt_release,
2743};
2744
2745
2746
2747
2748
2749
2750
2751
2752int rpc_clnt_test_and_add_xprt(struct rpc_clnt *clnt,
2753 struct rpc_xprt_switch *xps, struct rpc_xprt *xprt,
2754 void *dummy)
2755{
2756 struct rpc_cb_add_xprt_calldata *data;
2757 struct rpc_task *task;
2758
2759 data = kmalloc(sizeof(*data), GFP_NOFS);
2760 if (!data)
2761 return -ENOMEM;
2762 data->xps = xprt_switch_get(xps);
2763 data->xprt = xprt_get(xprt);
2764 if (rpc_xprt_switch_has_addr(data->xps, (struct sockaddr *)&xprt->addr)) {
2765 rpc_cb_add_xprt_release(data);
2766 goto success;
2767 }
2768
2769 task = rpc_call_null_helper(clnt, xprt, NULL, RPC_TASK_ASYNC,
2770 &rpc_cb_add_xprt_call_ops, data);
2771
2772 rpc_put_task(task);
2773success:
2774 return 1;
2775}
2776EXPORT_SYMBOL_GPL(rpc_clnt_test_and_add_xprt);
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796int rpc_clnt_setup_test_and_add_xprt(struct rpc_clnt *clnt,
2797 struct rpc_xprt_switch *xps,
2798 struct rpc_xprt *xprt,
2799 void *data)
2800{
2801 struct rpc_task *task;
2802 struct rpc_add_xprt_test *xtest = (struct rpc_add_xprt_test *)data;
2803 int status = -EADDRINUSE;
2804
2805 xprt = xprt_get(xprt);
2806 xprt_switch_get(xps);
2807
2808 if (rpc_xprt_switch_has_addr(xps, (struct sockaddr *)&xprt->addr))
2809 goto out_err;
2810
2811
2812 task = rpc_call_null_helper(clnt, xprt, NULL, 0, NULL, NULL);
2813 if (IS_ERR(task)) {
2814 status = PTR_ERR(task);
2815 goto out_err;
2816 }
2817 status = task->tk_status;
2818 rpc_put_task(task);
2819
2820 if (status < 0)
2821 goto out_err;
2822
2823
2824 xtest->add_xprt_test(clnt, xprt, xtest->data);
2825
2826 xprt_put(xprt);
2827 xprt_switch_put(xps);
2828
2829
2830 return 1;
2831out_err:
2832 xprt_put(xprt);
2833 xprt_switch_put(xps);
2834 pr_info("RPC: rpc_clnt_test_xprt failed: %d addr %s not added\n",
2835 status, xprt->address_strings[RPC_DISPLAY_ADDR]);
2836 return status;
2837}
2838EXPORT_SYMBOL_GPL(rpc_clnt_setup_test_and_add_xprt);
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853int rpc_clnt_add_xprt(struct rpc_clnt *clnt,
2854 struct xprt_create *xprtargs,
2855 int (*setup)(struct rpc_clnt *,
2856 struct rpc_xprt_switch *,
2857 struct rpc_xprt *,
2858 void *),
2859 void *data)
2860{
2861 struct rpc_xprt_switch *xps;
2862 struct rpc_xprt *xprt;
2863 unsigned long connect_timeout;
2864 unsigned long reconnect_timeout;
2865 unsigned char resvport, reuseport;
2866 int ret = 0;
2867
2868 rcu_read_lock();
2869 xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch));
2870 xprt = xprt_iter_xprt(&clnt->cl_xpi);
2871 if (xps == NULL || xprt == NULL) {
2872 rcu_read_unlock();
2873 xprt_switch_put(xps);
2874 return -EAGAIN;
2875 }
2876 resvport = xprt->resvport;
2877 reuseport = xprt->reuseport;
2878 connect_timeout = xprt->connect_timeout;
2879 reconnect_timeout = xprt->max_reconnect_timeout;
2880 rcu_read_unlock();
2881
2882 xprt = xprt_create_transport(xprtargs);
2883 if (IS_ERR(xprt)) {
2884 ret = PTR_ERR(xprt);
2885 goto out_put_switch;
2886 }
2887 xprt->resvport = resvport;
2888 xprt->reuseport = reuseport;
2889 if (xprt->ops->set_connect_timeout != NULL)
2890 xprt->ops->set_connect_timeout(xprt,
2891 connect_timeout,
2892 reconnect_timeout);
2893
2894 rpc_xprt_switch_set_roundrobin(xps);
2895 if (setup) {
2896 ret = setup(clnt, xps, xprt, data);
2897 if (ret != 0)
2898 goto out_put_xprt;
2899 }
2900 rpc_xprt_switch_add_xprt(xps, xprt);
2901out_put_xprt:
2902 xprt_put(xprt);
2903out_put_switch:
2904 xprt_switch_put(xps);
2905 return ret;
2906}
2907EXPORT_SYMBOL_GPL(rpc_clnt_add_xprt);
2908
2909struct connect_timeout_data {
2910 unsigned long connect_timeout;
2911 unsigned long reconnect_timeout;
2912};
2913
2914static int
2915rpc_xprt_set_connect_timeout(struct rpc_clnt *clnt,
2916 struct rpc_xprt *xprt,
2917 void *data)
2918{
2919 struct connect_timeout_data *timeo = data;
2920
2921 if (xprt->ops->set_connect_timeout)
2922 xprt->ops->set_connect_timeout(xprt,
2923 timeo->connect_timeout,
2924 timeo->reconnect_timeout);
2925 return 0;
2926}
2927
2928void
2929rpc_set_connect_timeout(struct rpc_clnt *clnt,
2930 unsigned long connect_timeout,
2931 unsigned long reconnect_timeout)
2932{
2933 struct connect_timeout_data timeout = {
2934 .connect_timeout = connect_timeout,
2935 .reconnect_timeout = reconnect_timeout,
2936 };
2937 rpc_clnt_iterate_for_each_xprt(clnt,
2938 rpc_xprt_set_connect_timeout,
2939 &timeout);
2940}
2941EXPORT_SYMBOL_GPL(rpc_set_connect_timeout);
2942
2943void rpc_clnt_xprt_switch_put(struct rpc_clnt *clnt)
2944{
2945 rcu_read_lock();
2946 xprt_switch_put(rcu_dereference(clnt->cl_xpi.xpi_xpswitch));
2947 rcu_read_unlock();
2948}
2949EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_put);
2950
2951void rpc_clnt_xprt_switch_add_xprt(struct rpc_clnt *clnt, struct rpc_xprt *xprt)
2952{
2953 rcu_read_lock();
2954 rpc_xprt_switch_add_xprt(rcu_dereference(clnt->cl_xpi.xpi_xpswitch),
2955 xprt);
2956 rcu_read_unlock();
2957}
2958EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_add_xprt);
2959
2960bool rpc_clnt_xprt_switch_has_addr(struct rpc_clnt *clnt,
2961 const struct sockaddr *sap)
2962{
2963 struct rpc_xprt_switch *xps;
2964 bool ret;
2965
2966 rcu_read_lock();
2967 xps = rcu_dereference(clnt->cl_xpi.xpi_xpswitch);
2968 ret = rpc_xprt_switch_has_addr(xps, sap);
2969 rcu_read_unlock();
2970 return ret;
2971}
2972EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_has_addr);
2973
2974#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
2975static void rpc_show_header(void)
2976{
2977 printk(KERN_INFO "-pid- flgs status -client- --rqstp- "
2978 "-timeout ---ops--\n");
2979}
2980
2981static void rpc_show_task(const struct rpc_clnt *clnt,
2982 const struct rpc_task *task)
2983{
2984 const char *rpc_waitq = "none";
2985
2986 if (RPC_IS_QUEUED(task))
2987 rpc_waitq = rpc_qname(task->tk_waitqueue);
2988
2989 printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%ps q:%s\n",
2990 task->tk_pid, task->tk_flags, task->tk_status,
2991 clnt, task->tk_rqstp, rpc_task_timeout(task), task->tk_ops,
2992 clnt->cl_program->name, clnt->cl_vers, rpc_proc_name(task),
2993 task->tk_action, rpc_waitq);
2994}
2995
2996void rpc_show_tasks(struct net *net)
2997{
2998 struct rpc_clnt *clnt;
2999 struct rpc_task *task;
3000 int header = 0;
3001 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
3002
3003 spin_lock(&sn->rpc_client_lock);
3004 list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
3005 spin_lock(&clnt->cl_lock);
3006 list_for_each_entry(task, &clnt->cl_tasks, tk_task) {
3007 if (!header) {
3008 rpc_show_header();
3009 header++;
3010 }
3011 rpc_show_task(clnt, task);
3012 }
3013 spin_unlock(&clnt->cl_lock);
3014 }
3015 spin_unlock(&sn->rpc_client_lock);
3016}
3017#endif
3018
3019#if IS_ENABLED(CONFIG_SUNRPC_SWAP)
3020static int
3021rpc_clnt_swap_activate_callback(struct rpc_clnt *clnt,
3022 struct rpc_xprt *xprt,
3023 void *dummy)
3024{
3025 return xprt_enable_swap(xprt);
3026}
3027
3028int
3029rpc_clnt_swap_activate(struct rpc_clnt *clnt)
3030{
3031 if (atomic_inc_return(&clnt->cl_swapper) == 1)
3032 return rpc_clnt_iterate_for_each_xprt(clnt,
3033 rpc_clnt_swap_activate_callback, NULL);
3034 return 0;
3035}
3036EXPORT_SYMBOL_GPL(rpc_clnt_swap_activate);
3037
3038static int
3039rpc_clnt_swap_deactivate_callback(struct rpc_clnt *clnt,
3040 struct rpc_xprt *xprt,
3041 void *dummy)
3042{
3043 xprt_disable_swap(xprt);
3044 return 0;
3045}
3046
3047void
3048rpc_clnt_swap_deactivate(struct rpc_clnt *clnt)
3049{
3050 if (atomic_dec_if_positive(&clnt->cl_swapper) == 0)
3051 rpc_clnt_iterate_for_each_xprt(clnt,
3052 rpc_clnt_swap_deactivate_callback, NULL);
3053}
3054EXPORT_SYMBOL_GPL(rpc_clnt_swap_deactivate);
3055#endif
3056