Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/net/sunrpc/rpcclnt.c | |
3 | * | |
4 | * This file contains the high-level RPC interface. | |
5 | * It is modeled as a finite state machine to support both synchronous | |
6 | * and asynchronous requests. | |
7 | * | |
8 | * - RPC header generation and argument serialization. | |
9 | * - Credential refresh. | |
10 | * - TCP connect handling. | |
11 | * - Retry of operation when it is suspected the operation failed because | |
12 | * of uid squashing on the server, or when the credentials were stale | |
13 | * and need to be refreshed, or when a packet was damaged in transit. | |
14 | * This may be have to be moved to the VFS layer. | |
15 | * | |
16 | * NB: BSD uses a more intelligent approach to guessing when a request | |
17 | * or reply has been lost by keeping the RTO estimate for each procedure. | |
18 | * We currently make do with a constant timeout value. | |
19 | * | |
20 | * Copyright (C) 1992,1993 Rick Sladkey <jrs@world.std.com> | |
21 | * Copyright (C) 1995,1996 Olaf Kirch <okir@monad.swb.de> | |
22 | */ | |
23 | ||
24 | #include <asm/system.h> | |
25 | ||
26 | #include <linux/module.h> | |
27 | #include <linux/types.h> | |
28 | #include <linux/mm.h> | |
29 | #include <linux/slab.h> | |
1da177e4 LT |
30 | #include <linux/utsname.h> |
31 | ||
32 | #include <linux/sunrpc/clnt.h> | |
33 | #include <linux/workqueue.h> | |
34 | #include <linux/sunrpc/rpc_pipe_fs.h> | |
35 | ||
36 | #include <linux/nfs.h> | |
37 | ||
38 | ||
39 | #define RPC_SLACK_SPACE (1024) /* total overkill */ | |
40 | ||
41 | #ifdef RPC_DEBUG | |
42 | # define RPCDBG_FACILITY RPCDBG_CALL | |
43 | #endif | |
44 | ||
45 | static DECLARE_WAIT_QUEUE_HEAD(destroy_wait); | |
46 | ||
47 | ||
48 | static void call_start(struct rpc_task *task); | |
49 | static void call_reserve(struct rpc_task *task); | |
50 | static void call_reserveresult(struct rpc_task *task); | |
51 | static void call_allocate(struct rpc_task *task); | |
52 | static void call_encode(struct rpc_task *task); | |
53 | static void call_decode(struct rpc_task *task); | |
54 | static void call_bind(struct rpc_task *task); | |
da351878 | 55 | static void call_bind_status(struct rpc_task *task); |
1da177e4 LT |
56 | static void call_transmit(struct rpc_task *task); |
57 | static void call_status(struct rpc_task *task); | |
58 | static void call_refresh(struct rpc_task *task); | |
59 | static void call_refreshresult(struct rpc_task *task); | |
60 | static void call_timeout(struct rpc_task *task); | |
61 | static void call_connect(struct rpc_task *task); | |
62 | static void call_connect_status(struct rpc_task *task); | |
63 | static u32 * call_header(struct rpc_task *task); | |
64 | static u32 * call_verify(struct rpc_task *task); | |
65 | ||
66 | ||
67 | static int | |
68 | rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name) | |
69 | { | |
70 | static uint32_t clntid; | |
71 | int error; | |
72 | ||
73 | if (dir_name == NULL) | |
74 | return 0; | |
75 | for (;;) { | |
76 | snprintf(clnt->cl_pathname, sizeof(clnt->cl_pathname), | |
77 | "%s/clnt%x", dir_name, | |
78 | (unsigned int)clntid++); | |
79 | clnt->cl_pathname[sizeof(clnt->cl_pathname) - 1] = '\0'; | |
80 | clnt->cl_dentry = rpc_mkdir(clnt->cl_pathname, clnt); | |
81 | if (!IS_ERR(clnt->cl_dentry)) | |
82 | return 0; | |
83 | error = PTR_ERR(clnt->cl_dentry); | |
84 | if (error != -EEXIST) { | |
85 | printk(KERN_INFO "RPC: Couldn't create pipefs entry %s, error %d\n", | |
86 | clnt->cl_pathname, error); | |
87 | return error; | |
88 | } | |
89 | } | |
90 | } | |
91 | ||
92 | /* | |
93 | * Create an RPC client | |
94 | * FIXME: This should also take a flags argument (as in task->tk_flags). | |
95 | * It's called (among others) from pmap_create_client, which may in | |
96 | * turn be called by an async task. In this case, rpciod should not be | |
97 | * made to sleep too long. | |
98 | */ | |
99 | struct rpc_clnt * | |
5ee0ed7d | 100 | rpc_new_client(struct rpc_xprt *xprt, char *servname, |
1da177e4 LT |
101 | struct rpc_program *program, u32 vers, |
102 | rpc_authflavor_t flavor) | |
103 | { | |
104 | struct rpc_version *version; | |
105 | struct rpc_clnt *clnt = NULL; | |
6a19275a | 106 | struct rpc_auth *auth; |
1da177e4 LT |
107 | int err; |
108 | int len; | |
109 | ||
110 | dprintk("RPC: creating %s client for %s (xprt %p)\n", | |
111 | program->name, servname, xprt); | |
112 | ||
113 | err = -EINVAL; | |
114 | if (!xprt) | |
115 | goto out_err; | |
116 | if (vers >= program->nrvers || !(version = program->version[vers])) | |
117 | goto out_err; | |
118 | ||
119 | err = -ENOMEM; | |
120 | clnt = (struct rpc_clnt *) kmalloc(sizeof(*clnt), GFP_KERNEL); | |
121 | if (!clnt) | |
122 | goto out_err; | |
123 | memset(clnt, 0, sizeof(*clnt)); | |
124 | atomic_set(&clnt->cl_users, 0); | |
125 | atomic_set(&clnt->cl_count, 1); | |
126 | clnt->cl_parent = clnt; | |
127 | ||
128 | clnt->cl_server = clnt->cl_inline_name; | |
129 | len = strlen(servname) + 1; | |
130 | if (len > sizeof(clnt->cl_inline_name)) { | |
131 | char *buf = kmalloc(len, GFP_KERNEL); | |
132 | if (buf != 0) | |
133 | clnt->cl_server = buf; | |
134 | else | |
135 | len = sizeof(clnt->cl_inline_name); | |
136 | } | |
137 | strlcpy(clnt->cl_server, servname, len); | |
138 | ||
139 | clnt->cl_xprt = xprt; | |
140 | clnt->cl_procinfo = version->procs; | |
141 | clnt->cl_maxproc = version->nrprocs; | |
142 | clnt->cl_protname = program->name; | |
143 | clnt->cl_pmap = &clnt->cl_pmap_default; | |
144 | clnt->cl_port = xprt->addr.sin_port; | |
145 | clnt->cl_prog = program->number; | |
146 | clnt->cl_vers = version->number; | |
147 | clnt->cl_prot = xprt->prot; | |
148 | clnt->cl_stats = program->stats; | |
149 | rpc_init_wait_queue(&clnt->cl_pmap_default.pm_bindwait, "bindwait"); | |
150 | ||
151 | if (!clnt->cl_port) | |
152 | clnt->cl_autobind = 1; | |
153 | ||
154 | clnt->cl_rtt = &clnt->cl_rtt_default; | |
155 | rpc_init_rtt(&clnt->cl_rtt_default, xprt->timeout.to_initval); | |
156 | ||
157 | err = rpc_setup_pipedir(clnt, program->pipe_dir_name); | |
158 | if (err < 0) | |
159 | goto out_no_path; | |
160 | ||
6a19275a BF |
161 | auth = rpcauth_create(flavor, clnt); |
162 | if (IS_ERR(auth)) { | |
1da177e4 LT |
163 | printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n", |
164 | flavor); | |
6a19275a | 165 | err = PTR_ERR(auth); |
1da177e4 LT |
166 | goto out_no_auth; |
167 | } | |
168 | ||
169 | /* save the nodename */ | |
170 | clnt->cl_nodelen = strlen(system_utsname.nodename); | |
171 | if (clnt->cl_nodelen > UNX_MAXNODENAME) | |
172 | clnt->cl_nodelen = UNX_MAXNODENAME; | |
173 | memcpy(clnt->cl_nodename, system_utsname.nodename, clnt->cl_nodelen); | |
174 | return clnt; | |
175 | ||
176 | out_no_auth: | |
177 | rpc_rmdir(clnt->cl_pathname); | |
178 | out_no_path: | |
179 | if (clnt->cl_server != clnt->cl_inline_name) | |
180 | kfree(clnt->cl_server); | |
181 | kfree(clnt); | |
182 | out_err: | |
5b616f5d | 183 | xprt_destroy(xprt); |
1da177e4 LT |
184 | return ERR_PTR(err); |
185 | } | |
186 | ||
5ee0ed7d TM |
187 | /** |
188 | * Create an RPC client | |
189 | * @xprt - pointer to xprt struct | |
190 | * @servname - name of server | |
191 | * @info - rpc_program | |
192 | * @version - rpc_program version | |
193 | * @authflavor - rpc_auth flavour to use | |
194 | * | |
195 | * Creates an RPC client structure, then pings the server in order to | |
196 | * determine if it is up, and if it supports this program and version. | |
197 | * | |
198 | * This function should never be called by asynchronous tasks such as | |
199 | * the portmapper. | |
200 | */ | |
201 | struct rpc_clnt *rpc_create_client(struct rpc_xprt *xprt, char *servname, | |
202 | struct rpc_program *info, u32 version, rpc_authflavor_t authflavor) | |
203 | { | |
204 | struct rpc_clnt *clnt; | |
205 | int err; | |
206 | ||
207 | clnt = rpc_new_client(xprt, servname, info, version, authflavor); | |
208 | if (IS_ERR(clnt)) | |
209 | return clnt; | |
210 | err = rpc_ping(clnt, RPC_TASK_SOFT|RPC_TASK_NOINTR); | |
211 | if (err == 0) | |
212 | return clnt; | |
213 | rpc_shutdown_client(clnt); | |
214 | return ERR_PTR(err); | |
215 | } | |
216 | ||
1da177e4 LT |
217 | /* |
218 | * This function clones the RPC client structure. It allows us to share the | |
219 | * same transport while varying parameters such as the authentication | |
220 | * flavour. | |
221 | */ | |
222 | struct rpc_clnt * | |
223 | rpc_clone_client(struct rpc_clnt *clnt) | |
224 | { | |
225 | struct rpc_clnt *new; | |
226 | ||
227 | new = (struct rpc_clnt *)kmalloc(sizeof(*new), GFP_KERNEL); | |
228 | if (!new) | |
229 | goto out_no_clnt; | |
230 | memcpy(new, clnt, sizeof(*new)); | |
231 | atomic_set(&new->cl_count, 1); | |
232 | atomic_set(&new->cl_users, 0); | |
233 | new->cl_parent = clnt; | |
234 | atomic_inc(&clnt->cl_count); | |
235 | /* Duplicate portmapper */ | |
236 | rpc_init_wait_queue(&new->cl_pmap_default.pm_bindwait, "bindwait"); | |
237 | /* Turn off autobind on clones */ | |
238 | new->cl_autobind = 0; | |
239 | new->cl_oneshot = 0; | |
240 | new->cl_dead = 0; | |
241 | rpc_init_rtt(&new->cl_rtt_default, clnt->cl_xprt->timeout.to_initval); | |
242 | if (new->cl_auth) | |
243 | atomic_inc(&new->cl_auth->au_count); | |
007e251f AG |
244 | new->cl_pmap = &new->cl_pmap_default; |
245 | rpc_init_wait_queue(&new->cl_pmap_default.pm_bindwait, "bindwait"); | |
1da177e4 LT |
246 | return new; |
247 | out_no_clnt: | |
248 | printk(KERN_INFO "RPC: out of memory in %s\n", __FUNCTION__); | |
249 | return ERR_PTR(-ENOMEM); | |
250 | } | |
251 | ||
252 | /* | |
253 | * Properly shut down an RPC client, terminating all outstanding | |
254 | * requests. Note that we must be certain that cl_oneshot and | |
255 | * cl_dead are cleared, or else the client would be destroyed | |
256 | * when the last task releases it. | |
257 | */ | |
258 | int | |
259 | rpc_shutdown_client(struct rpc_clnt *clnt) | |
260 | { | |
261 | dprintk("RPC: shutting down %s client for %s, tasks=%d\n", | |
262 | clnt->cl_protname, clnt->cl_server, | |
263 | atomic_read(&clnt->cl_users)); | |
264 | ||
265 | while (atomic_read(&clnt->cl_users) > 0) { | |
266 | /* Don't let rpc_release_client destroy us */ | |
267 | clnt->cl_oneshot = 0; | |
268 | clnt->cl_dead = 0; | |
269 | rpc_killall_tasks(clnt); | |
270 | sleep_on_timeout(&destroy_wait, 1*HZ); | |
271 | } | |
272 | ||
273 | if (atomic_read(&clnt->cl_users) < 0) { | |
274 | printk(KERN_ERR "RPC: rpc_shutdown_client clnt %p tasks=%d\n", | |
275 | clnt, atomic_read(&clnt->cl_users)); | |
276 | #ifdef RPC_DEBUG | |
277 | rpc_show_tasks(); | |
278 | #endif | |
279 | BUG(); | |
280 | } | |
281 | ||
282 | return rpc_destroy_client(clnt); | |
283 | } | |
284 | ||
285 | /* | |
286 | * Delete an RPC client | |
287 | */ | |
288 | int | |
289 | rpc_destroy_client(struct rpc_clnt *clnt) | |
290 | { | |
291 | if (!atomic_dec_and_test(&clnt->cl_count)) | |
292 | return 1; | |
293 | BUG_ON(atomic_read(&clnt->cl_users) != 0); | |
294 | ||
295 | dprintk("RPC: destroying %s client for %s\n", | |
296 | clnt->cl_protname, clnt->cl_server); | |
297 | if (clnt->cl_auth) { | |
298 | rpcauth_destroy(clnt->cl_auth); | |
299 | clnt->cl_auth = NULL; | |
300 | } | |
301 | if (clnt->cl_parent != clnt) { | |
302 | rpc_destroy_client(clnt->cl_parent); | |
303 | goto out_free; | |
304 | } | |
305 | if (clnt->cl_pathname[0]) | |
306 | rpc_rmdir(clnt->cl_pathname); | |
307 | if (clnt->cl_xprt) { | |
308 | xprt_destroy(clnt->cl_xprt); | |
309 | clnt->cl_xprt = NULL; | |
310 | } | |
311 | if (clnt->cl_server != clnt->cl_inline_name) | |
312 | kfree(clnt->cl_server); | |
313 | out_free: | |
314 | kfree(clnt); | |
315 | return 0; | |
316 | } | |
317 | ||
318 | /* | |
319 | * Release an RPC client | |
320 | */ | |
321 | void | |
322 | rpc_release_client(struct rpc_clnt *clnt) | |
323 | { | |
324 | dprintk("RPC: rpc_release_client(%p, %d)\n", | |
325 | clnt, atomic_read(&clnt->cl_users)); | |
326 | ||
327 | if (!atomic_dec_and_test(&clnt->cl_users)) | |
328 | return; | |
329 | wake_up(&destroy_wait); | |
330 | if (clnt->cl_oneshot || clnt->cl_dead) | |
331 | rpc_destroy_client(clnt); | |
332 | } | |
333 | ||
007e251f AG |
334 | /** |
335 | * rpc_bind_new_program - bind a new RPC program to an existing client | |
336 | * @old - old rpc_client | |
337 | * @program - rpc program to set | |
338 | * @vers - rpc program version | |
339 | * | |
340 | * Clones the rpc client and sets up a new RPC program. This is mainly | |
341 | * of use for enabling different RPC programs to share the same transport. | |
342 | * The Sun NFSv2/v3 ACL protocol can do this. | |
343 | */ | |
344 | struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old, | |
345 | struct rpc_program *program, | |
346 | int vers) | |
347 | { | |
348 | struct rpc_clnt *clnt; | |
349 | struct rpc_version *version; | |
350 | int err; | |
351 | ||
352 | BUG_ON(vers >= program->nrvers || !program->version[vers]); | |
353 | version = program->version[vers]; | |
354 | clnt = rpc_clone_client(old); | |
355 | if (IS_ERR(clnt)) | |
356 | goto out; | |
357 | clnt->cl_procinfo = version->procs; | |
358 | clnt->cl_maxproc = version->nrprocs; | |
359 | clnt->cl_protname = program->name; | |
360 | clnt->cl_prog = program->number; | |
361 | clnt->cl_vers = version->number; | |
362 | clnt->cl_stats = program->stats; | |
363 | err = rpc_ping(clnt, RPC_TASK_SOFT|RPC_TASK_NOINTR); | |
364 | if (err != 0) { | |
365 | rpc_shutdown_client(clnt); | |
366 | clnt = ERR_PTR(err); | |
367 | } | |
368 | out: | |
369 | return clnt; | |
370 | } | |
371 | ||
1da177e4 LT |
372 | /* |
373 | * Default callback for async RPC calls | |
374 | */ | |
375 | static void | |
376 | rpc_default_callback(struct rpc_task *task) | |
377 | { | |
378 | } | |
379 | ||
380 | /* | |
14b218a8 | 381 | * Export the signal mask handling for synchronous code that |
1da177e4 LT |
382 | * sleeps on RPC calls |
383 | */ | |
14b218a8 | 384 | #define RPC_INTR_SIGNALS (sigmask(SIGINT) | sigmask(SIGQUIT) | sigmask(SIGKILL)) |
1da177e4 | 385 | |
14b218a8 TM |
386 | static void rpc_save_sigmask(sigset_t *oldset, int intr) |
387 | { | |
388 | unsigned long sigallow = 0; | |
389 | sigset_t sigmask; | |
390 | ||
391 | /* Block all signals except those listed in sigallow */ | |
392 | if (intr) | |
393 | sigallow |= RPC_INTR_SIGNALS; | |
394 | siginitsetinv(&sigmask, sigallow); | |
395 | sigprocmask(SIG_BLOCK, &sigmask, oldset); | |
396 | } | |
397 | ||
398 | static inline void rpc_task_sigmask(struct rpc_task *task, sigset_t *oldset) | |
399 | { | |
400 | rpc_save_sigmask(oldset, !RPC_TASK_UNINTERRUPTIBLE(task)); | |
401 | } | |
402 | ||
403 | static inline void rpc_restore_sigmask(sigset_t *oldset) | |
404 | { | |
405 | sigprocmask(SIG_SETMASK, oldset, NULL); | |
406 | } | |
407 | ||
1da177e4 LT |
408 | void rpc_clnt_sigmask(struct rpc_clnt *clnt, sigset_t *oldset) |
409 | { | |
14b218a8 | 410 | rpc_save_sigmask(oldset, clnt->cl_intr); |
1da177e4 LT |
411 | } |
412 | ||
413 | void rpc_clnt_sigunmask(struct rpc_clnt *clnt, sigset_t *oldset) | |
414 | { | |
14b218a8 | 415 | rpc_restore_sigmask(oldset); |
1da177e4 LT |
416 | } |
417 | ||
418 | /* | |
419 | * New rpc_call implementation | |
420 | */ | |
421 | int rpc_call_sync(struct rpc_clnt *clnt, struct rpc_message *msg, int flags) | |
422 | { | |
423 | struct rpc_task *task; | |
424 | sigset_t oldset; | |
425 | int status; | |
426 | ||
427 | /* If this client is slain all further I/O fails */ | |
428 | if (clnt->cl_dead) | |
429 | return -EIO; | |
430 | ||
431 | BUG_ON(flags & RPC_TASK_ASYNC); | |
432 | ||
1da177e4 LT |
433 | status = -ENOMEM; |
434 | task = rpc_new_task(clnt, NULL, flags); | |
435 | if (task == NULL) | |
436 | goto out; | |
437 | ||
14b218a8 TM |
438 | /* Mask signals on RPC calls _and_ GSS_AUTH upcalls */ |
439 | rpc_task_sigmask(task, &oldset); | |
440 | ||
1da177e4 LT |
441 | rpc_call_setup(task, msg, 0); |
442 | ||
443 | /* Set up the call info struct and execute the task */ | |
14b218a8 | 444 | if (task->tk_status == 0) { |
1da177e4 | 445 | status = rpc_execute(task); |
14b218a8 | 446 | } else { |
1da177e4 LT |
447 | status = task->tk_status; |
448 | rpc_release_task(task); | |
449 | } | |
450 | ||
14b218a8 | 451 | rpc_restore_sigmask(&oldset); |
1da177e4 | 452 | out: |
1da177e4 LT |
453 | return status; |
454 | } | |
455 | ||
456 | /* | |
457 | * New rpc_call implementation | |
458 | */ | |
459 | int | |
460 | rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, int flags, | |
461 | rpc_action callback, void *data) | |
462 | { | |
463 | struct rpc_task *task; | |
464 | sigset_t oldset; | |
465 | int status; | |
466 | ||
467 | /* If this client is slain all further I/O fails */ | |
468 | if (clnt->cl_dead) | |
469 | return -EIO; | |
470 | ||
471 | flags |= RPC_TASK_ASYNC; | |
472 | ||
1da177e4 LT |
473 | /* Create/initialize a new RPC task */ |
474 | if (!callback) | |
475 | callback = rpc_default_callback; | |
476 | status = -ENOMEM; | |
477 | if (!(task = rpc_new_task(clnt, callback, flags))) | |
478 | goto out; | |
479 | task->tk_calldata = data; | |
480 | ||
14b218a8 TM |
481 | /* Mask signals on GSS_AUTH upcalls */ |
482 | rpc_task_sigmask(task, &oldset); | |
483 | ||
1da177e4 LT |
484 | rpc_call_setup(task, msg, 0); |
485 | ||
486 | /* Set up the call info struct and execute the task */ | |
487 | status = task->tk_status; | |
488 | if (status == 0) | |
489 | rpc_execute(task); | |
490 | else | |
491 | rpc_release_task(task); | |
492 | ||
14b218a8 | 493 | rpc_restore_sigmask(&oldset); |
1da177e4 | 494 | out: |
1da177e4 LT |
495 | return status; |
496 | } | |
497 | ||
498 | ||
499 | void | |
500 | rpc_call_setup(struct rpc_task *task, struct rpc_message *msg, int flags) | |
501 | { | |
502 | task->tk_msg = *msg; | |
503 | task->tk_flags |= flags; | |
504 | /* Bind the user cred */ | |
505 | if (task->tk_msg.rpc_cred != NULL) | |
506 | rpcauth_holdcred(task); | |
507 | else | |
508 | rpcauth_bindcred(task); | |
509 | ||
510 | if (task->tk_status == 0) | |
511 | task->tk_action = call_start; | |
512 | else | |
513 | task->tk_action = NULL; | |
514 | } | |
515 | ||
516 | void | |
517 | rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize) | |
518 | { | |
519 | struct rpc_xprt *xprt = clnt->cl_xprt; | |
520 | ||
521 | xprt->sndsize = 0; | |
522 | if (sndsize) | |
523 | xprt->sndsize = sndsize + RPC_SLACK_SPACE; | |
524 | xprt->rcvsize = 0; | |
525 | if (rcvsize) | |
526 | xprt->rcvsize = rcvsize + RPC_SLACK_SPACE; | |
a246b010 | 527 | xprt->ops->set_buffer_size(xprt); |
1da177e4 LT |
528 | } |
529 | ||
530 | /* | |
531 | * Return size of largest payload RPC client can support, in bytes | |
532 | * | |
533 | * For stream transports, this is one RPC record fragment (see RFC | |
534 | * 1831), as we don't support multi-record requests yet. For datagram | |
535 | * transports, this is the size of an IP packet minus the IP, UDP, and | |
536 | * RPC header sizes. | |
537 | */ | |
538 | size_t rpc_max_payload(struct rpc_clnt *clnt) | |
539 | { | |
540 | return clnt->cl_xprt->max_payload; | |
541 | } | |
542 | EXPORT_SYMBOL(rpc_max_payload); | |
543 | ||
544 | /* | |
545 | * Restart an (async) RPC call. Usually called from within the | |
546 | * exit handler. | |
547 | */ | |
548 | void | |
549 | rpc_restart_call(struct rpc_task *task) | |
550 | { | |
551 | if (RPC_ASSASSINATED(task)) | |
552 | return; | |
553 | ||
554 | task->tk_action = call_start; | |
555 | } | |
556 | ||
557 | /* | |
558 | * 0. Initial state | |
559 | * | |
560 | * Other FSM states can be visited zero or more times, but | |
561 | * this state is visited exactly once for each RPC. | |
562 | */ | |
563 | static void | |
564 | call_start(struct rpc_task *task) | |
565 | { | |
566 | struct rpc_clnt *clnt = task->tk_client; | |
567 | ||
568 | dprintk("RPC: %4d call_start %s%d proc %d (%s)\n", task->tk_pid, | |
569 | clnt->cl_protname, clnt->cl_vers, task->tk_msg.rpc_proc->p_proc, | |
570 | (RPC_IS_ASYNC(task) ? "async" : "sync")); | |
571 | ||
572 | /* Increment call count */ | |
573 | task->tk_msg.rpc_proc->p_count++; | |
574 | clnt->cl_stats->rpccnt++; | |
575 | task->tk_action = call_reserve; | |
576 | } | |
577 | ||
578 | /* | |
579 | * 1. Reserve an RPC call slot | |
580 | */ | |
581 | static void | |
582 | call_reserve(struct rpc_task *task) | |
583 | { | |
584 | dprintk("RPC: %4d call_reserve\n", task->tk_pid); | |
585 | ||
586 | if (!rpcauth_uptodatecred(task)) { | |
587 | task->tk_action = call_refresh; | |
588 | return; | |
589 | } | |
590 | ||
591 | task->tk_status = 0; | |
592 | task->tk_action = call_reserveresult; | |
593 | xprt_reserve(task); | |
594 | } | |
595 | ||
596 | /* | |
597 | * 1b. Grok the result of xprt_reserve() | |
598 | */ | |
599 | static void | |
600 | call_reserveresult(struct rpc_task *task) | |
601 | { | |
602 | int status = task->tk_status; | |
603 | ||
604 | dprintk("RPC: %4d call_reserveresult (status %d)\n", | |
605 | task->tk_pid, task->tk_status); | |
606 | ||
607 | /* | |
608 | * After a call to xprt_reserve(), we must have either | |
609 | * a request slot or else an error status. | |
610 | */ | |
611 | task->tk_status = 0; | |
612 | if (status >= 0) { | |
613 | if (task->tk_rqstp) { | |
614 | task->tk_action = call_allocate; | |
615 | return; | |
616 | } | |
617 | ||
618 | printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n", | |
619 | __FUNCTION__, status); | |
620 | rpc_exit(task, -EIO); | |
621 | return; | |
622 | } | |
623 | ||
624 | /* | |
625 | * Even though there was an error, we may have acquired | |
626 | * a request slot somehow. Make sure not to leak it. | |
627 | */ | |
628 | if (task->tk_rqstp) { | |
629 | printk(KERN_ERR "%s: status=%d, request allocated anyway\n", | |
630 | __FUNCTION__, status); | |
631 | xprt_release(task); | |
632 | } | |
633 | ||
634 | switch (status) { | |
635 | case -EAGAIN: /* woken up; retry */ | |
636 | task->tk_action = call_reserve; | |
637 | return; | |
638 | case -EIO: /* probably a shutdown */ | |
639 | break; | |
640 | default: | |
641 | printk(KERN_ERR "%s: unrecognized error %d, exiting\n", | |
642 | __FUNCTION__, status); | |
643 | break; | |
644 | } | |
645 | rpc_exit(task, status); | |
646 | } | |
647 | ||
648 | /* | |
649 | * 2. Allocate the buffer. For details, see sched.c:rpc_malloc. | |
650 | * (Note: buffer memory is freed in rpc_task_release). | |
651 | */ | |
652 | static void | |
653 | call_allocate(struct rpc_task *task) | |
654 | { | |
655 | unsigned int bufsiz; | |
656 | ||
657 | dprintk("RPC: %4d call_allocate (status %d)\n", | |
658 | task->tk_pid, task->tk_status); | |
659 | task->tk_action = call_bind; | |
660 | if (task->tk_buffer) | |
661 | return; | |
662 | ||
663 | /* FIXME: compute buffer requirements more exactly using | |
664 | * auth->au_wslack */ | |
665 | bufsiz = task->tk_msg.rpc_proc->p_bufsiz + RPC_SLACK_SPACE; | |
666 | ||
667 | if (rpc_malloc(task, bufsiz << 1) != NULL) | |
668 | return; | |
669 | printk(KERN_INFO "RPC: buffer allocation failed for task %p\n", task); | |
670 | ||
14b218a8 | 671 | if (RPC_IS_ASYNC(task) || !signalled()) { |
1da177e4 LT |
672 | xprt_release(task); |
673 | task->tk_action = call_reserve; | |
674 | rpc_delay(task, HZ>>4); | |
675 | return; | |
676 | } | |
677 | ||
678 | rpc_exit(task, -ERESTARTSYS); | |
679 | } | |
680 | ||
681 | /* | |
682 | * 3. Encode arguments of an RPC call | |
683 | */ | |
684 | static void | |
685 | call_encode(struct rpc_task *task) | |
686 | { | |
687 | struct rpc_clnt *clnt = task->tk_client; | |
688 | struct rpc_rqst *req = task->tk_rqstp; | |
689 | struct xdr_buf *sndbuf = &req->rq_snd_buf; | |
690 | struct xdr_buf *rcvbuf = &req->rq_rcv_buf; | |
691 | unsigned int bufsiz; | |
692 | kxdrproc_t encode; | |
693 | int status; | |
694 | u32 *p; | |
695 | ||
696 | dprintk("RPC: %4d call_encode (status %d)\n", | |
697 | task->tk_pid, task->tk_status); | |
698 | ||
699 | /* Default buffer setup */ | |
700 | bufsiz = task->tk_bufsize >> 1; | |
701 | sndbuf->head[0].iov_base = (void *)task->tk_buffer; | |
702 | sndbuf->head[0].iov_len = bufsiz; | |
703 | sndbuf->tail[0].iov_len = 0; | |
704 | sndbuf->page_len = 0; | |
705 | sndbuf->len = 0; | |
706 | sndbuf->buflen = bufsiz; | |
707 | rcvbuf->head[0].iov_base = (void *)((char *)task->tk_buffer + bufsiz); | |
708 | rcvbuf->head[0].iov_len = bufsiz; | |
709 | rcvbuf->tail[0].iov_len = 0; | |
710 | rcvbuf->page_len = 0; | |
711 | rcvbuf->len = 0; | |
712 | rcvbuf->buflen = bufsiz; | |
713 | ||
714 | /* Encode header and provided arguments */ | |
715 | encode = task->tk_msg.rpc_proc->p_encode; | |
716 | if (!(p = call_header(task))) { | |
717 | printk(KERN_INFO "RPC: call_header failed, exit EIO\n"); | |
718 | rpc_exit(task, -EIO); | |
719 | return; | |
720 | } | |
721 | if (encode && (status = rpcauth_wrap_req(task, encode, req, p, | |
722 | task->tk_msg.rpc_argp)) < 0) { | |
723 | printk(KERN_WARNING "%s: can't encode arguments: %d\n", | |
724 | clnt->cl_protname, -status); | |
725 | rpc_exit(task, status); | |
726 | } | |
727 | } | |
728 | ||
729 | /* | |
730 | * 4. Get the server port number if not yet set | |
731 | */ | |
732 | static void | |
733 | call_bind(struct rpc_task *task) | |
734 | { | |
735 | struct rpc_clnt *clnt = task->tk_client; | |
1da177e4 | 736 | |
da351878 CL |
737 | dprintk("RPC: %4d call_bind (status %d)\n", |
738 | task->tk_pid, task->tk_status); | |
1da177e4 | 739 | |
da351878 | 740 | task->tk_action = call_connect; |
1da177e4 | 741 | if (!clnt->cl_port) { |
da351878 | 742 | task->tk_action = call_bind_status; |
1da177e4 LT |
743 | task->tk_timeout = RPC_CONNECT_TIMEOUT; |
744 | rpc_getport(task, clnt); | |
745 | } | |
746 | } | |
747 | ||
748 | /* | |
da351878 CL |
749 | * 4a. Sort out bind result |
750 | */ | |
751 | static void | |
752 | call_bind_status(struct rpc_task *task) | |
753 | { | |
754 | int status = -EACCES; | |
755 | ||
756 | if (task->tk_status >= 0) { | |
757 | dprintk("RPC: %4d call_bind_status (status %d)\n", | |
758 | task->tk_pid, task->tk_status); | |
759 | task->tk_status = 0; | |
760 | task->tk_action = call_connect; | |
761 | return; | |
762 | } | |
763 | ||
764 | switch (task->tk_status) { | |
765 | case -EACCES: | |
766 | dprintk("RPC: %4d remote rpcbind: RPC program/version unavailable\n", | |
767 | task->tk_pid); | |
768 | break; | |
769 | case -ETIMEDOUT: | |
770 | dprintk("RPC: %4d rpcbind request timed out\n", | |
771 | task->tk_pid); | |
772 | if (RPC_IS_SOFT(task)) { | |
773 | status = -EIO; | |
774 | break; | |
775 | } | |
776 | goto retry_bind; | |
777 | case -EPFNOSUPPORT: | |
778 | dprintk("RPC: %4d remote rpcbind service unavailable\n", | |
779 | task->tk_pid); | |
780 | break; | |
781 | case -EPROTONOSUPPORT: | |
782 | dprintk("RPC: %4d remote rpcbind version 2 unavailable\n", | |
783 | task->tk_pid); | |
784 | break; | |
785 | default: | |
786 | dprintk("RPC: %4d unrecognized rpcbind error (%d)\n", | |
787 | task->tk_pid, -task->tk_status); | |
788 | status = -EIO; | |
789 | break; | |
790 | } | |
791 | ||
792 | rpc_exit(task, status); | |
793 | return; | |
794 | ||
795 | retry_bind: | |
796 | task->tk_status = 0; | |
797 | task->tk_action = call_bind; | |
798 | return; | |
799 | } | |
800 | ||
801 | /* | |
802 | * 4b. Connect to the RPC server | |
1da177e4 LT |
803 | */ |
804 | static void | |
805 | call_connect(struct rpc_task *task) | |
806 | { | |
da351878 | 807 | struct rpc_xprt *xprt = task->tk_xprt; |
1da177e4 | 808 | |
da351878 CL |
809 | dprintk("RPC: %4d call_connect xprt %p %s connected\n", |
810 | task->tk_pid, xprt, | |
811 | (xprt_connected(xprt) ? "is" : "is not")); | |
1da177e4 | 812 | |
da351878 CL |
813 | task->tk_action = call_transmit; |
814 | if (!xprt_connected(xprt)) { | |
815 | task->tk_action = call_connect_status; | |
816 | if (task->tk_status < 0) | |
817 | return; | |
818 | xprt_connect(task); | |
1da177e4 | 819 | } |
1da177e4 LT |
820 | } |
821 | ||
822 | /* | |
da351878 | 823 | * 4c. Sort out connect result |
1da177e4 LT |
824 | */ |
825 | static void | |
826 | call_connect_status(struct rpc_task *task) | |
827 | { | |
828 | struct rpc_clnt *clnt = task->tk_client; | |
829 | int status = task->tk_status; | |
830 | ||
da351878 CL |
831 | dprintk("RPC: %5u call_connect_status (status %d)\n", |
832 | task->tk_pid, task->tk_status); | |
833 | ||
1da177e4 LT |
834 | task->tk_status = 0; |
835 | if (status >= 0) { | |
836 | clnt->cl_stats->netreconn++; | |
837 | task->tk_action = call_transmit; | |
838 | return; | |
839 | } | |
840 | ||
da351878 | 841 | /* Something failed: remote service port may have changed */ |
1da177e4 LT |
842 | if (clnt->cl_autobind) |
843 | clnt->cl_port = 0; | |
da351878 | 844 | |
1da177e4 LT |
845 | switch (status) { |
846 | case -ENOTCONN: | |
847 | case -ETIMEDOUT: | |
848 | case -EAGAIN: | |
da351878 | 849 | task->tk_action = call_bind; |
1da177e4 LT |
850 | break; |
851 | default: | |
852 | rpc_exit(task, -EIO); | |
da351878 | 853 | break; |
1da177e4 LT |
854 | } |
855 | } | |
856 | ||
857 | /* | |
858 | * 5. Transmit the RPC request, and wait for reply | |
859 | */ | |
860 | static void | |
861 | call_transmit(struct rpc_task *task) | |
862 | { | |
863 | dprintk("RPC: %4d call_transmit (status %d)\n", | |
864 | task->tk_pid, task->tk_status); | |
865 | ||
866 | task->tk_action = call_status; | |
867 | if (task->tk_status < 0) | |
868 | return; | |
869 | task->tk_status = xprt_prepare_transmit(task); | |
870 | if (task->tk_status != 0) | |
871 | return; | |
872 | /* Encode here so that rpcsec_gss can use correct sequence number. */ | |
873 | if (!task->tk_rqstp->rq_bytes_sent) | |
874 | call_encode(task); | |
875 | if (task->tk_status < 0) | |
876 | return; | |
877 | xprt_transmit(task); | |
878 | if (task->tk_status < 0) | |
879 | return; | |
880 | if (!task->tk_msg.rpc_proc->p_decode) { | |
881 | task->tk_action = NULL; | |
882 | rpc_wake_up_task(task); | |
883 | } | |
884 | } | |
885 | ||
886 | /* | |
887 | * 6. Sort out the RPC call status | |
888 | */ | |
889 | static void | |
890 | call_status(struct rpc_task *task) | |
891 | { | |
892 | struct rpc_clnt *clnt = task->tk_client; | |
893 | struct rpc_rqst *req = task->tk_rqstp; | |
894 | int status; | |
895 | ||
896 | if (req->rq_received > 0 && !req->rq_bytes_sent) | |
897 | task->tk_status = req->rq_received; | |
898 | ||
899 | dprintk("RPC: %4d call_status (status %d)\n", | |
900 | task->tk_pid, task->tk_status); | |
901 | ||
902 | status = task->tk_status; | |
903 | if (status >= 0) { | |
904 | task->tk_action = call_decode; | |
905 | return; | |
906 | } | |
907 | ||
908 | task->tk_status = 0; | |
909 | switch(status) { | |
910 | case -ETIMEDOUT: | |
911 | task->tk_action = call_timeout; | |
912 | break; | |
913 | case -ECONNREFUSED: | |
914 | case -ENOTCONN: | |
915 | req->rq_bytes_sent = 0; | |
916 | if (clnt->cl_autobind) | |
917 | clnt->cl_port = 0; | |
918 | task->tk_action = call_bind; | |
919 | break; | |
920 | case -EAGAIN: | |
921 | task->tk_action = call_transmit; | |
922 | break; | |
923 | case -EIO: | |
924 | /* shutdown or soft timeout */ | |
925 | rpc_exit(task, status); | |
926 | break; | |
927 | default: | |
928 | if (clnt->cl_chatty) | |
929 | printk("%s: RPC call returned error %d\n", | |
930 | clnt->cl_protname, -status); | |
931 | rpc_exit(task, status); | |
932 | break; | |
933 | } | |
934 | } | |
935 | ||
936 | /* | |
937 | * 6a. Handle RPC timeout | |
938 | * We do not release the request slot, so we keep using the | |
939 | * same XID for all retransmits. | |
940 | */ | |
941 | static void | |
942 | call_timeout(struct rpc_task *task) | |
943 | { | |
944 | struct rpc_clnt *clnt = task->tk_client; | |
945 | ||
946 | if (xprt_adjust_timeout(task->tk_rqstp) == 0) { | |
947 | dprintk("RPC: %4d call_timeout (minor)\n", task->tk_pid); | |
948 | goto retry; | |
949 | } | |
950 | ||
951 | dprintk("RPC: %4d call_timeout (major)\n", task->tk_pid); | |
952 | if (RPC_IS_SOFT(task)) { | |
953 | if (clnt->cl_chatty) | |
954 | printk(KERN_NOTICE "%s: server %s not responding, timed out\n", | |
955 | clnt->cl_protname, clnt->cl_server); | |
956 | rpc_exit(task, -EIO); | |
957 | return; | |
958 | } | |
959 | ||
960 | if (clnt->cl_chatty && !(task->tk_flags & RPC_CALL_MAJORSEEN)) { | |
961 | task->tk_flags |= RPC_CALL_MAJORSEEN; | |
962 | printk(KERN_NOTICE "%s: server %s not responding, still trying\n", | |
963 | clnt->cl_protname, clnt->cl_server); | |
964 | } | |
965 | if (clnt->cl_autobind) | |
966 | clnt->cl_port = 0; | |
967 | ||
968 | retry: | |
969 | clnt->cl_stats->rpcretrans++; | |
970 | task->tk_action = call_bind; | |
971 | task->tk_status = 0; | |
972 | } | |
973 | ||
974 | /* | |
975 | * 7. Decode the RPC reply | |
976 | */ | |
977 | static void | |
978 | call_decode(struct rpc_task *task) | |
979 | { | |
980 | struct rpc_clnt *clnt = task->tk_client; | |
981 | struct rpc_rqst *req = task->tk_rqstp; | |
982 | kxdrproc_t decode = task->tk_msg.rpc_proc->p_decode; | |
983 | u32 *p; | |
984 | ||
985 | dprintk("RPC: %4d call_decode (status %d)\n", | |
986 | task->tk_pid, task->tk_status); | |
987 | ||
988 | if (clnt->cl_chatty && (task->tk_flags & RPC_CALL_MAJORSEEN)) { | |
989 | printk(KERN_NOTICE "%s: server %s OK\n", | |
990 | clnt->cl_protname, clnt->cl_server); | |
991 | task->tk_flags &= ~RPC_CALL_MAJORSEEN; | |
992 | } | |
993 | ||
994 | if (task->tk_status < 12) { | |
995 | if (!RPC_IS_SOFT(task)) { | |
996 | task->tk_action = call_bind; | |
997 | clnt->cl_stats->rpcretrans++; | |
998 | goto out_retry; | |
999 | } | |
1000 | printk(KERN_WARNING "%s: too small RPC reply size (%d bytes)\n", | |
1001 | clnt->cl_protname, task->tk_status); | |
1002 | rpc_exit(task, -EIO); | |
1003 | return; | |
1004 | } | |
1005 | ||
1006 | req->rq_rcv_buf.len = req->rq_private_buf.len; | |
1007 | ||
1008 | /* Check that the softirq receive buffer is valid */ | |
1009 | WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf, | |
1010 | sizeof(req->rq_rcv_buf)) != 0); | |
1011 | ||
1012 | /* Verify the RPC header */ | |
1013 | if (!(p = call_verify(task))) { | |
1014 | if (task->tk_action == NULL) | |
1015 | return; | |
1016 | goto out_retry; | |
1017 | } | |
1018 | ||
1019 | task->tk_action = NULL; | |
1020 | ||
1021 | if (decode) | |
1022 | task->tk_status = rpcauth_unwrap_resp(task, decode, req, p, | |
1023 | task->tk_msg.rpc_resp); | |
1024 | dprintk("RPC: %4d call_decode result %d\n", task->tk_pid, | |
1025 | task->tk_status); | |
1026 | return; | |
1027 | out_retry: | |
1028 | req->rq_received = req->rq_private_buf.len = 0; | |
1029 | task->tk_status = 0; | |
1030 | } | |
1031 | ||
1032 | /* | |
1033 | * 8. Refresh the credentials if rejected by the server | |
1034 | */ | |
1035 | static void | |
1036 | call_refresh(struct rpc_task *task) | |
1037 | { | |
1038 | dprintk("RPC: %4d call_refresh\n", task->tk_pid); | |
1039 | ||
1040 | xprt_release(task); /* Must do to obtain new XID */ | |
1041 | task->tk_action = call_refreshresult; | |
1042 | task->tk_status = 0; | |
1043 | task->tk_client->cl_stats->rpcauthrefresh++; | |
1044 | rpcauth_refreshcred(task); | |
1045 | } | |
1046 | ||
1047 | /* | |
1048 | * 8a. Process the results of a credential refresh | |
1049 | */ | |
1050 | static void | |
1051 | call_refreshresult(struct rpc_task *task) | |
1052 | { | |
1053 | int status = task->tk_status; | |
1054 | dprintk("RPC: %4d call_refreshresult (status %d)\n", | |
1055 | task->tk_pid, task->tk_status); | |
1056 | ||
1057 | task->tk_status = 0; | |
1058 | task->tk_action = call_reserve; | |
1059 | if (status >= 0 && rpcauth_uptodatecred(task)) | |
1060 | return; | |
1061 | if (status == -EACCES) { | |
1062 | rpc_exit(task, -EACCES); | |
1063 | return; | |
1064 | } | |
1065 | task->tk_action = call_refresh; | |
1066 | if (status != -ETIMEDOUT) | |
1067 | rpc_delay(task, 3*HZ); | |
1068 | return; | |
1069 | } | |
1070 | ||
1071 | /* | |
1072 | * Call header serialization | |
1073 | */ | |
1074 | static u32 * | |
1075 | call_header(struct rpc_task *task) | |
1076 | { | |
1077 | struct rpc_clnt *clnt = task->tk_client; | |
1078 | struct rpc_xprt *xprt = clnt->cl_xprt; | |
1079 | struct rpc_rqst *req = task->tk_rqstp; | |
1080 | u32 *p = req->rq_svec[0].iov_base; | |
1081 | ||
1082 | /* FIXME: check buffer size? */ | |
1083 | if (xprt->stream) | |
1084 | *p++ = 0; /* fill in later */ | |
1085 | *p++ = req->rq_xid; /* XID */ | |
1086 | *p++ = htonl(RPC_CALL); /* CALL */ | |
1087 | *p++ = htonl(RPC_VERSION); /* RPC version */ | |
1088 | *p++ = htonl(clnt->cl_prog); /* program number */ | |
1089 | *p++ = htonl(clnt->cl_vers); /* program version */ | |
1090 | *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */ | |
334ccfd5 TM |
1091 | p = rpcauth_marshcred(task, p); |
1092 | req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p); | |
1093 | return p; | |
1da177e4 LT |
1094 | } |
1095 | ||
1096 | /* | |
1097 | * Reply header verification | |
1098 | */ | |
1099 | static u32 * | |
1100 | call_verify(struct rpc_task *task) | |
1101 | { | |
1102 | struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0]; | |
1103 | int len = task->tk_rqstp->rq_rcv_buf.len >> 2; | |
1104 | u32 *p = iov->iov_base, n; | |
1105 | int error = -EACCES; | |
1106 | ||
1107 | if ((len -= 3) < 0) | |
1108 | goto out_overflow; | |
1109 | p += 1; /* skip XID */ | |
1110 | ||
1111 | if ((n = ntohl(*p++)) != RPC_REPLY) { | |
1112 | printk(KERN_WARNING "call_verify: not an RPC reply: %x\n", n); | |
1113 | goto out_retry; | |
1114 | } | |
1115 | if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) { | |
1116 | if (--len < 0) | |
1117 | goto out_overflow; | |
1118 | switch ((n = ntohl(*p++))) { | |
1119 | case RPC_AUTH_ERROR: | |
1120 | break; | |
1121 | case RPC_MISMATCH: | |
cdf47706 AG |
1122 | dprintk("%s: RPC call version mismatch!\n", __FUNCTION__); |
1123 | error = -EPROTONOSUPPORT; | |
1124 | goto out_err; | |
1da177e4 | 1125 | default: |
cdf47706 | 1126 | dprintk("%s: RPC call rejected, unknown error: %x\n", __FUNCTION__, n); |
1da177e4 LT |
1127 | goto out_eio; |
1128 | } | |
1129 | if (--len < 0) | |
1130 | goto out_overflow; | |
1131 | switch ((n = ntohl(*p++))) { | |
1132 | case RPC_AUTH_REJECTEDCRED: | |
1133 | case RPC_AUTH_REJECTEDVERF: | |
1134 | case RPCSEC_GSS_CREDPROBLEM: | |
1135 | case RPCSEC_GSS_CTXPROBLEM: | |
1136 | if (!task->tk_cred_retry) | |
1137 | break; | |
1138 | task->tk_cred_retry--; | |
1139 | dprintk("RPC: %4d call_verify: retry stale creds\n", | |
1140 | task->tk_pid); | |
1141 | rpcauth_invalcred(task); | |
1142 | task->tk_action = call_refresh; | |
1143 | return NULL; | |
1144 | case RPC_AUTH_BADCRED: | |
1145 | case RPC_AUTH_BADVERF: | |
1146 | /* possibly garbled cred/verf? */ | |
1147 | if (!task->tk_garb_retry) | |
1148 | break; | |
1149 | task->tk_garb_retry--; | |
1150 | dprintk("RPC: %4d call_verify: retry garbled creds\n", | |
1151 | task->tk_pid); | |
1152 | task->tk_action = call_bind; | |
1153 | return NULL; | |
1154 | case RPC_AUTH_TOOWEAK: | |
1155 | printk(KERN_NOTICE "call_verify: server requires stronger " | |
1156 | "authentication.\n"); | |
1157 | break; | |
1158 | default: | |
1159 | printk(KERN_WARNING "call_verify: unknown auth error: %x\n", n); | |
1160 | error = -EIO; | |
1161 | } | |
1162 | dprintk("RPC: %4d call_verify: call rejected %d\n", | |
1163 | task->tk_pid, n); | |
1164 | goto out_err; | |
1165 | } | |
1166 | if (!(p = rpcauth_checkverf(task, p))) { | |
1167 | printk(KERN_WARNING "call_verify: auth check failed\n"); | |
1168 | goto out_retry; /* bad verifier, retry */ | |
1169 | } | |
1170 | len = p - (u32 *)iov->iov_base - 1; | |
1171 | if (len < 0) | |
1172 | goto out_overflow; | |
1173 | switch ((n = ntohl(*p++))) { | |
1174 | case RPC_SUCCESS: | |
1175 | return p; | |
1176 | case RPC_PROG_UNAVAIL: | |
cdf47706 | 1177 | dprintk("RPC: call_verify: program %u is unsupported by server %s\n", |
1da177e4 LT |
1178 | (unsigned int)task->tk_client->cl_prog, |
1179 | task->tk_client->cl_server); | |
cdf47706 AG |
1180 | error = -EPFNOSUPPORT; |
1181 | goto out_err; | |
1da177e4 | 1182 | case RPC_PROG_MISMATCH: |
cdf47706 | 1183 | dprintk("RPC: call_verify: program %u, version %u unsupported by server %s\n", |
1da177e4 LT |
1184 | (unsigned int)task->tk_client->cl_prog, |
1185 | (unsigned int)task->tk_client->cl_vers, | |
1186 | task->tk_client->cl_server); | |
cdf47706 AG |
1187 | error = -EPROTONOSUPPORT; |
1188 | goto out_err; | |
1da177e4 | 1189 | case RPC_PROC_UNAVAIL: |
cdf47706 | 1190 | dprintk("RPC: call_verify: proc %p unsupported by program %u, version %u on server %s\n", |
1da177e4 LT |
1191 | task->tk_msg.rpc_proc, |
1192 | task->tk_client->cl_prog, | |
1193 | task->tk_client->cl_vers, | |
1194 | task->tk_client->cl_server); | |
cdf47706 AG |
1195 | error = -EOPNOTSUPP; |
1196 | goto out_err; | |
1da177e4 LT |
1197 | case RPC_GARBAGE_ARGS: |
1198 | dprintk("RPC: %4d %s: server saw garbage\n", task->tk_pid, __FUNCTION__); | |
1199 | break; /* retry */ | |
1200 | default: | |
1201 | printk(KERN_WARNING "call_verify: server accept status: %x\n", n); | |
1202 | /* Also retry */ | |
1203 | } | |
1204 | ||
1205 | out_retry: | |
1206 | task->tk_client->cl_stats->rpcgarbage++; | |
1207 | if (task->tk_garb_retry) { | |
1208 | task->tk_garb_retry--; | |
cdf47706 | 1209 | dprintk("RPC %s: retrying %4d\n", __FUNCTION__, task->tk_pid); |
1da177e4 LT |
1210 | task->tk_action = call_bind; |
1211 | return NULL; | |
1212 | } | |
1213 | printk(KERN_WARNING "RPC %s: retry failed, exit EIO\n", __FUNCTION__); | |
1214 | out_eio: | |
1215 | error = -EIO; | |
1216 | out_err: | |
1217 | rpc_exit(task, error); | |
1218 | return NULL; | |
1219 | out_overflow: | |
1220 | printk(KERN_WARNING "RPC %s: server reply was truncated.\n", __FUNCTION__); | |
1221 | goto out_retry; | |
1222 | } | |
5ee0ed7d TM |
1223 | |
1224 | static int rpcproc_encode_null(void *rqstp, u32 *data, void *obj) | |
1225 | { | |
1226 | return 0; | |
1227 | } | |
1228 | ||
1229 | static int rpcproc_decode_null(void *rqstp, u32 *data, void *obj) | |
1230 | { | |
1231 | return 0; | |
1232 | } | |
1233 | ||
1234 | static struct rpc_procinfo rpcproc_null = { | |
1235 | .p_encode = rpcproc_encode_null, | |
1236 | .p_decode = rpcproc_decode_null, | |
1237 | }; | |
1238 | ||
1239 | int rpc_ping(struct rpc_clnt *clnt, int flags) | |
1240 | { | |
1241 | struct rpc_message msg = { | |
1242 | .rpc_proc = &rpcproc_null, | |
1243 | }; | |
1244 | int err; | |
1245 | msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0); | |
1246 | err = rpc_call_sync(clnt, &msg, flags); | |
1247 | put_rpccred(msg.rpc_cred); | |
1248 | return err; | |
1249 | } |