Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
55aa4f58 | 2 | * linux/net/sunrpc/clnt.c |
1da177e4 LT |
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); | |
940e3318 | 58 | static void call_transmit_status(struct rpc_task *task); |
1da177e4 LT |
59 | static void call_refresh(struct rpc_task *task); |
60 | static void call_refreshresult(struct rpc_task *task); | |
61 | static void call_timeout(struct rpc_task *task); | |
62 | static void call_connect(struct rpc_task *task); | |
63 | static void call_connect_status(struct rpc_task *task); | |
64 | static u32 * call_header(struct rpc_task *task); | |
65 | static u32 * call_verify(struct rpc_task *task); | |
66 | ||
67 | ||
68 | static int | |
69 | rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name) | |
70 | { | |
f134585a | 71 | static uint32_t clntid; |
1da177e4 LT |
72 | int error; |
73 | ||
74 | if (dir_name == NULL) | |
75 | return 0; | |
f134585a TM |
76 | for (;;) { |
77 | snprintf(clnt->cl_pathname, sizeof(clnt->cl_pathname), | |
78 | "%s/clnt%x", dir_name, | |
79 | (unsigned int)clntid++); | |
80 | clnt->cl_pathname[sizeof(clnt->cl_pathname) - 1] = '\0'; | |
81 | clnt->cl_dentry = rpc_mkdir(clnt->cl_pathname, clnt); | |
82 | if (!IS_ERR(clnt->cl_dentry)) | |
83 | return 0; | |
1da177e4 | 84 | error = PTR_ERR(clnt->cl_dentry); |
f134585a TM |
85 | if (error != -EEXIST) { |
86 | printk(KERN_INFO "RPC: Couldn't create pipefs entry %s, error %d\n", | |
87 | clnt->cl_pathname, error); | |
88 | return error; | |
89 | } | |
1da177e4 LT |
90 | } |
91 | } | |
92 | ||
93 | /* | |
94 | * Create an RPC client | |
95 | * FIXME: This should also take a flags argument (as in task->tk_flags). | |
96 | * It's called (among others) from pmap_create_client, which may in | |
97 | * turn be called by an async task. In this case, rpciod should not be | |
98 | * made to sleep too long. | |
99 | */ | |
100 | struct rpc_clnt * | |
5ee0ed7d | 101 | rpc_new_client(struct rpc_xprt *xprt, char *servname, |
1da177e4 LT |
102 | struct rpc_program *program, u32 vers, |
103 | rpc_authflavor_t flavor) | |
104 | { | |
105 | struct rpc_version *version; | |
106 | struct rpc_clnt *clnt = NULL; | |
6a19275a | 107 | struct rpc_auth *auth; |
1da177e4 LT |
108 | int err; |
109 | int len; | |
110 | ||
111 | dprintk("RPC: creating %s client for %s (xprt %p)\n", | |
112 | program->name, servname, xprt); | |
113 | ||
114 | err = -EINVAL; | |
115 | if (!xprt) | |
116 | goto out_err; | |
117 | if (vers >= program->nrvers || !(version = program->version[vers])) | |
118 | goto out_err; | |
119 | ||
120 | err = -ENOMEM; | |
121 | clnt = (struct rpc_clnt *) kmalloc(sizeof(*clnt), GFP_KERNEL); | |
122 | if (!clnt) | |
123 | goto out_err; | |
124 | memset(clnt, 0, sizeof(*clnt)); | |
125 | atomic_set(&clnt->cl_users, 0); | |
126 | atomic_set(&clnt->cl_count, 1); | |
127 | clnt->cl_parent = clnt; | |
128 | ||
129 | clnt->cl_server = clnt->cl_inline_name; | |
130 | len = strlen(servname) + 1; | |
131 | if (len > sizeof(clnt->cl_inline_name)) { | |
132 | char *buf = kmalloc(len, GFP_KERNEL); | |
133 | if (buf != 0) | |
134 | clnt->cl_server = buf; | |
135 | else | |
136 | len = sizeof(clnt->cl_inline_name); | |
137 | } | |
138 | strlcpy(clnt->cl_server, servname, len); | |
139 | ||
140 | clnt->cl_xprt = xprt; | |
141 | clnt->cl_procinfo = version->procs; | |
142 | clnt->cl_maxproc = version->nrprocs; | |
143 | clnt->cl_protname = program->name; | |
144 | clnt->cl_pmap = &clnt->cl_pmap_default; | |
145 | clnt->cl_port = xprt->addr.sin_port; | |
146 | clnt->cl_prog = program->number; | |
147 | clnt->cl_vers = version->number; | |
148 | clnt->cl_prot = xprt->prot; | |
149 | clnt->cl_stats = program->stats; | |
150 | rpc_init_wait_queue(&clnt->cl_pmap_default.pm_bindwait, "bindwait"); | |
151 | ||
152 | if (!clnt->cl_port) | |
153 | clnt->cl_autobind = 1; | |
154 | ||
155 | clnt->cl_rtt = &clnt->cl_rtt_default; | |
156 | rpc_init_rtt(&clnt->cl_rtt_default, xprt->timeout.to_initval); | |
157 | ||
158 | err = rpc_setup_pipedir(clnt, program->pipe_dir_name); | |
159 | if (err < 0) | |
160 | goto out_no_path; | |
161 | ||
6a19275a BF |
162 | auth = rpcauth_create(flavor, clnt); |
163 | if (IS_ERR(auth)) { | |
1da177e4 LT |
164 | printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n", |
165 | flavor); | |
6a19275a | 166 | err = PTR_ERR(auth); |
1da177e4 LT |
167 | goto out_no_auth; |
168 | } | |
169 | ||
170 | /* save the nodename */ | |
171 | clnt->cl_nodelen = strlen(system_utsname.nodename); | |
172 | if (clnt->cl_nodelen > UNX_MAXNODENAME) | |
173 | clnt->cl_nodelen = UNX_MAXNODENAME; | |
174 | memcpy(clnt->cl_nodename, system_utsname.nodename, clnt->cl_nodelen); | |
175 | return clnt; | |
176 | ||
177 | out_no_auth: | |
f134585a | 178 | rpc_rmdir(clnt->cl_pathname); |
1da177e4 LT |
179 | out_no_path: |
180 | if (clnt->cl_server != clnt->cl_inline_name) | |
181 | kfree(clnt->cl_server); | |
182 | kfree(clnt); | |
183 | out_err: | |
5b616f5d | 184 | xprt_destroy(xprt); |
1da177e4 LT |
185 | return ERR_PTR(err); |
186 | } | |
187 | ||
5ee0ed7d TM |
188 | /** |
189 | * Create an RPC client | |
190 | * @xprt - pointer to xprt struct | |
191 | * @servname - name of server | |
192 | * @info - rpc_program | |
193 | * @version - rpc_program version | |
194 | * @authflavor - rpc_auth flavour to use | |
195 | * | |
196 | * Creates an RPC client structure, then pings the server in order to | |
197 | * determine if it is up, and if it supports this program and version. | |
198 | * | |
199 | * This function should never be called by asynchronous tasks such as | |
200 | * the portmapper. | |
201 | */ | |
202 | struct rpc_clnt *rpc_create_client(struct rpc_xprt *xprt, char *servname, | |
203 | struct rpc_program *info, u32 version, rpc_authflavor_t authflavor) | |
204 | { | |
205 | struct rpc_clnt *clnt; | |
206 | int err; | |
207 | ||
208 | clnt = rpc_new_client(xprt, servname, info, version, authflavor); | |
209 | if (IS_ERR(clnt)) | |
210 | return clnt; | |
211 | err = rpc_ping(clnt, RPC_TASK_SOFT|RPC_TASK_NOINTR); | |
212 | if (err == 0) | |
213 | return clnt; | |
214 | rpc_shutdown_client(clnt); | |
215 | return ERR_PTR(err); | |
216 | } | |
217 | ||
1da177e4 LT |
218 | /* |
219 | * This function clones the RPC client structure. It allows us to share the | |
220 | * same transport while varying parameters such as the authentication | |
221 | * flavour. | |
222 | */ | |
223 | struct rpc_clnt * | |
224 | rpc_clone_client(struct rpc_clnt *clnt) | |
225 | { | |
226 | struct rpc_clnt *new; | |
227 | ||
228 | new = (struct rpc_clnt *)kmalloc(sizeof(*new), GFP_KERNEL); | |
229 | if (!new) | |
230 | goto out_no_clnt; | |
231 | memcpy(new, clnt, sizeof(*new)); | |
232 | atomic_set(&new->cl_count, 1); | |
233 | atomic_set(&new->cl_users, 0); | |
234 | new->cl_parent = clnt; | |
235 | atomic_inc(&clnt->cl_count); | |
236 | /* Duplicate portmapper */ | |
237 | rpc_init_wait_queue(&new->cl_pmap_default.pm_bindwait, "bindwait"); | |
238 | /* Turn off autobind on clones */ | |
239 | new->cl_autobind = 0; | |
240 | new->cl_oneshot = 0; | |
241 | new->cl_dead = 0; | |
242 | rpc_init_rtt(&new->cl_rtt_default, clnt->cl_xprt->timeout.to_initval); | |
243 | if (new->cl_auth) | |
244 | atomic_inc(&new->cl_auth->au_count); | |
007e251f AG |
245 | new->cl_pmap = &new->cl_pmap_default; |
246 | rpc_init_wait_queue(&new->cl_pmap_default.pm_bindwait, "bindwait"); | |
1da177e4 LT |
247 | return new; |
248 | out_no_clnt: | |
249 | printk(KERN_INFO "RPC: out of memory in %s\n", __FUNCTION__); | |
250 | return ERR_PTR(-ENOMEM); | |
251 | } | |
252 | ||
253 | /* | |
254 | * Properly shut down an RPC client, terminating all outstanding | |
255 | * requests. Note that we must be certain that cl_oneshot and | |
256 | * cl_dead are cleared, or else the client would be destroyed | |
257 | * when the last task releases it. | |
258 | */ | |
259 | int | |
260 | rpc_shutdown_client(struct rpc_clnt *clnt) | |
261 | { | |
262 | dprintk("RPC: shutting down %s client for %s, tasks=%d\n", | |
263 | clnt->cl_protname, clnt->cl_server, | |
264 | atomic_read(&clnt->cl_users)); | |
265 | ||
266 | while (atomic_read(&clnt->cl_users) > 0) { | |
267 | /* Don't let rpc_release_client destroy us */ | |
268 | clnt->cl_oneshot = 0; | |
269 | clnt->cl_dead = 0; | |
270 | rpc_killall_tasks(clnt); | |
271 | sleep_on_timeout(&destroy_wait, 1*HZ); | |
272 | } | |
273 | ||
274 | if (atomic_read(&clnt->cl_users) < 0) { | |
275 | printk(KERN_ERR "RPC: rpc_shutdown_client clnt %p tasks=%d\n", | |
276 | clnt, atomic_read(&clnt->cl_users)); | |
277 | #ifdef RPC_DEBUG | |
278 | rpc_show_tasks(); | |
279 | #endif | |
280 | BUG(); | |
281 | } | |
282 | ||
283 | return rpc_destroy_client(clnt); | |
284 | } | |
285 | ||
286 | /* | |
287 | * Delete an RPC client | |
288 | */ | |
289 | int | |
290 | rpc_destroy_client(struct rpc_clnt *clnt) | |
291 | { | |
292 | if (!atomic_dec_and_test(&clnt->cl_count)) | |
293 | return 1; | |
294 | BUG_ON(atomic_read(&clnt->cl_users) != 0); | |
295 | ||
296 | dprintk("RPC: destroying %s client for %s\n", | |
297 | clnt->cl_protname, clnt->cl_server); | |
298 | if (clnt->cl_auth) { | |
299 | rpcauth_destroy(clnt->cl_auth); | |
300 | clnt->cl_auth = NULL; | |
301 | } | |
302 | if (clnt->cl_parent != clnt) { | |
303 | rpc_destroy_client(clnt->cl_parent); | |
304 | goto out_free; | |
305 | } | |
f134585a TM |
306 | if (clnt->cl_pathname[0]) |
307 | rpc_rmdir(clnt->cl_pathname); | |
1da177e4 LT |
308 | if (clnt->cl_xprt) { |
309 | xprt_destroy(clnt->cl_xprt); | |
310 | clnt->cl_xprt = NULL; | |
311 | } | |
312 | if (clnt->cl_server != clnt->cl_inline_name) | |
313 | kfree(clnt->cl_server); | |
314 | out_free: | |
315 | kfree(clnt); | |
316 | return 0; | |
317 | } | |
318 | ||
319 | /* | |
320 | * Release an RPC client | |
321 | */ | |
322 | void | |
323 | rpc_release_client(struct rpc_clnt *clnt) | |
324 | { | |
325 | dprintk("RPC: rpc_release_client(%p, %d)\n", | |
326 | clnt, atomic_read(&clnt->cl_users)); | |
327 | ||
328 | if (!atomic_dec_and_test(&clnt->cl_users)) | |
329 | return; | |
330 | wake_up(&destroy_wait); | |
331 | if (clnt->cl_oneshot || clnt->cl_dead) | |
332 | rpc_destroy_client(clnt); | |
333 | } | |
334 | ||
007e251f AG |
335 | /** |
336 | * rpc_bind_new_program - bind a new RPC program to an existing client | |
337 | * @old - old rpc_client | |
338 | * @program - rpc program to set | |
339 | * @vers - rpc program version | |
340 | * | |
341 | * Clones the rpc client and sets up a new RPC program. This is mainly | |
342 | * of use for enabling different RPC programs to share the same transport. | |
343 | * The Sun NFSv2/v3 ACL protocol can do this. | |
344 | */ | |
345 | struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old, | |
346 | struct rpc_program *program, | |
347 | int vers) | |
348 | { | |
349 | struct rpc_clnt *clnt; | |
350 | struct rpc_version *version; | |
351 | int err; | |
352 | ||
353 | BUG_ON(vers >= program->nrvers || !program->version[vers]); | |
354 | version = program->version[vers]; | |
355 | clnt = rpc_clone_client(old); | |
356 | if (IS_ERR(clnt)) | |
357 | goto out; | |
358 | clnt->cl_procinfo = version->procs; | |
359 | clnt->cl_maxproc = version->nrprocs; | |
360 | clnt->cl_protname = program->name; | |
361 | clnt->cl_prog = program->number; | |
362 | clnt->cl_vers = version->number; | |
363 | clnt->cl_stats = program->stats; | |
364 | err = rpc_ping(clnt, RPC_TASK_SOFT|RPC_TASK_NOINTR); | |
365 | if (err != 0) { | |
366 | rpc_shutdown_client(clnt); | |
367 | clnt = ERR_PTR(err); | |
368 | } | |
369 | out: | |
370 | return clnt; | |
371 | } | |
372 | ||
1da177e4 LT |
373 | /* |
374 | * Default callback for async RPC calls | |
375 | */ | |
376 | static void | |
963d8fe5 | 377 | rpc_default_callback(struct rpc_task *task, void *data) |
1da177e4 LT |
378 | { |
379 | } | |
380 | ||
963d8fe5 TM |
381 | static const struct rpc_call_ops rpc_default_ops = { |
382 | .rpc_call_done = rpc_default_callback, | |
383 | }; | |
384 | ||
1da177e4 | 385 | /* |
14b218a8 | 386 | * Export the signal mask handling for synchronous code that |
1da177e4 LT |
387 | * sleeps on RPC calls |
388 | */ | |
2bd61579 | 389 | #define RPC_INTR_SIGNALS (sigmask(SIGHUP) | sigmask(SIGINT) | sigmask(SIGQUIT) | sigmask(SIGTERM)) |
1da177e4 | 390 | |
14b218a8 TM |
391 | static void rpc_save_sigmask(sigset_t *oldset, int intr) |
392 | { | |
2bd61579 | 393 | unsigned long sigallow = sigmask(SIGKILL); |
14b218a8 TM |
394 | sigset_t sigmask; |
395 | ||
396 | /* Block all signals except those listed in sigallow */ | |
397 | if (intr) | |
398 | sigallow |= RPC_INTR_SIGNALS; | |
399 | siginitsetinv(&sigmask, sigallow); | |
400 | sigprocmask(SIG_BLOCK, &sigmask, oldset); | |
401 | } | |
402 | ||
403 | static inline void rpc_task_sigmask(struct rpc_task *task, sigset_t *oldset) | |
404 | { | |
405 | rpc_save_sigmask(oldset, !RPC_TASK_UNINTERRUPTIBLE(task)); | |
406 | } | |
407 | ||
408 | static inline void rpc_restore_sigmask(sigset_t *oldset) | |
409 | { | |
410 | sigprocmask(SIG_SETMASK, oldset, NULL); | |
411 | } | |
412 | ||
1da177e4 LT |
413 | void rpc_clnt_sigmask(struct rpc_clnt *clnt, sigset_t *oldset) |
414 | { | |
14b218a8 | 415 | rpc_save_sigmask(oldset, clnt->cl_intr); |
1da177e4 LT |
416 | } |
417 | ||
418 | void rpc_clnt_sigunmask(struct rpc_clnt *clnt, sigset_t *oldset) | |
419 | { | |
14b218a8 | 420 | rpc_restore_sigmask(oldset); |
1da177e4 LT |
421 | } |
422 | ||
423 | /* | |
424 | * New rpc_call implementation | |
425 | */ | |
426 | int rpc_call_sync(struct rpc_clnt *clnt, struct rpc_message *msg, int flags) | |
427 | { | |
428 | struct rpc_task *task; | |
429 | sigset_t oldset; | |
430 | int status; | |
431 | ||
432 | /* If this client is slain all further I/O fails */ | |
433 | if (clnt->cl_dead) | |
434 | return -EIO; | |
435 | ||
436 | BUG_ON(flags & RPC_TASK_ASYNC); | |
437 | ||
1da177e4 | 438 | status = -ENOMEM; |
963d8fe5 | 439 | task = rpc_new_task(clnt, flags, &rpc_default_ops, NULL); |
1da177e4 LT |
440 | if (task == NULL) |
441 | goto out; | |
442 | ||
14b218a8 TM |
443 | /* Mask signals on RPC calls _and_ GSS_AUTH upcalls */ |
444 | rpc_task_sigmask(task, &oldset); | |
445 | ||
1da177e4 LT |
446 | rpc_call_setup(task, msg, 0); |
447 | ||
448 | /* Set up the call info struct and execute the task */ | |
e60859ac TM |
449 | status = task->tk_status; |
450 | if (status == 0) { | |
451 | atomic_inc(&task->tk_count); | |
1da177e4 | 452 | status = rpc_execute(task); |
e60859ac TM |
453 | if (status == 0) |
454 | status = task->tk_status; | |
1da177e4 | 455 | } |
14b218a8 | 456 | rpc_restore_sigmask(&oldset); |
e60859ac | 457 | rpc_release_task(task); |
1da177e4 | 458 | out: |
1da177e4 LT |
459 | return status; |
460 | } | |
461 | ||
462 | /* | |
463 | * New rpc_call implementation | |
464 | */ | |
465 | int | |
466 | rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, int flags, | |
963d8fe5 | 467 | const struct rpc_call_ops *tk_ops, void *data) |
1da177e4 LT |
468 | { |
469 | struct rpc_task *task; | |
470 | sigset_t oldset; | |
471 | int status; | |
472 | ||
473 | /* If this client is slain all further I/O fails */ | |
474 | if (clnt->cl_dead) | |
475 | return -EIO; | |
476 | ||
477 | flags |= RPC_TASK_ASYNC; | |
478 | ||
1da177e4 | 479 | /* Create/initialize a new RPC task */ |
1da177e4 | 480 | status = -ENOMEM; |
963d8fe5 | 481 | if (!(task = rpc_new_task(clnt, flags, tk_ops, data))) |
1da177e4 | 482 | goto out; |
1da177e4 | 483 | |
14b218a8 TM |
484 | /* Mask signals on GSS_AUTH upcalls */ |
485 | rpc_task_sigmask(task, &oldset); | |
486 | ||
1da177e4 LT |
487 | rpc_call_setup(task, msg, 0); |
488 | ||
489 | /* Set up the call info struct and execute the task */ | |
490 | status = task->tk_status; | |
491 | if (status == 0) | |
492 | rpc_execute(task); | |
493 | else | |
494 | rpc_release_task(task); | |
495 | ||
14b218a8 | 496 | rpc_restore_sigmask(&oldset); |
1da177e4 | 497 | out: |
1da177e4 LT |
498 | return status; |
499 | } | |
500 | ||
501 | ||
502 | void | |
503 | rpc_call_setup(struct rpc_task *task, struct rpc_message *msg, int flags) | |
504 | { | |
505 | task->tk_msg = *msg; | |
506 | task->tk_flags |= flags; | |
507 | /* Bind the user cred */ | |
508 | if (task->tk_msg.rpc_cred != NULL) | |
509 | rpcauth_holdcred(task); | |
510 | else | |
511 | rpcauth_bindcred(task); | |
512 | ||
513 | if (task->tk_status == 0) | |
514 | task->tk_action = call_start; | |
515 | else | |
abbcf28f | 516 | task->tk_action = rpc_exit_task; |
1da177e4 LT |
517 | } |
518 | ||
519 | void | |
520 | rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize) | |
521 | { | |
522 | struct rpc_xprt *xprt = clnt->cl_xprt; | |
470056c2 CL |
523 | if (xprt->ops->set_buffer_size) |
524 | xprt->ops->set_buffer_size(xprt, sndsize, rcvsize); | |
1da177e4 LT |
525 | } |
526 | ||
527 | /* | |
528 | * Return size of largest payload RPC client can support, in bytes | |
529 | * | |
530 | * For stream transports, this is one RPC record fragment (see RFC | |
531 | * 1831), as we don't support multi-record requests yet. For datagram | |
532 | * transports, this is the size of an IP packet minus the IP, UDP, and | |
533 | * RPC header sizes. | |
534 | */ | |
535 | size_t rpc_max_payload(struct rpc_clnt *clnt) | |
536 | { | |
537 | return clnt->cl_xprt->max_payload; | |
538 | } | |
539 | EXPORT_SYMBOL(rpc_max_payload); | |
540 | ||
35f5a422 CL |
541 | /** |
542 | * rpc_force_rebind - force transport to check that remote port is unchanged | |
543 | * @clnt: client to rebind | |
544 | * | |
545 | */ | |
546 | void rpc_force_rebind(struct rpc_clnt *clnt) | |
547 | { | |
548 | if (clnt->cl_autobind) | |
549 | clnt->cl_port = 0; | |
550 | } | |
551 | EXPORT_SYMBOL(rpc_force_rebind); | |
552 | ||
1da177e4 LT |
553 | /* |
554 | * Restart an (async) RPC call. Usually called from within the | |
555 | * exit handler. | |
556 | */ | |
557 | void | |
558 | rpc_restart_call(struct rpc_task *task) | |
559 | { | |
560 | if (RPC_ASSASSINATED(task)) | |
561 | return; | |
562 | ||
563 | task->tk_action = call_start; | |
564 | } | |
565 | ||
566 | /* | |
567 | * 0. Initial state | |
568 | * | |
569 | * Other FSM states can be visited zero or more times, but | |
570 | * this state is visited exactly once for each RPC. | |
571 | */ | |
572 | static void | |
573 | call_start(struct rpc_task *task) | |
574 | { | |
575 | struct rpc_clnt *clnt = task->tk_client; | |
576 | ||
577 | dprintk("RPC: %4d call_start %s%d proc %d (%s)\n", task->tk_pid, | |
578 | clnt->cl_protname, clnt->cl_vers, task->tk_msg.rpc_proc->p_proc, | |
579 | (RPC_IS_ASYNC(task) ? "async" : "sync")); | |
580 | ||
581 | /* Increment call count */ | |
582 | task->tk_msg.rpc_proc->p_count++; | |
583 | clnt->cl_stats->rpccnt++; | |
584 | task->tk_action = call_reserve; | |
585 | } | |
586 | ||
587 | /* | |
588 | * 1. Reserve an RPC call slot | |
589 | */ | |
590 | static void | |
591 | call_reserve(struct rpc_task *task) | |
592 | { | |
593 | dprintk("RPC: %4d call_reserve\n", task->tk_pid); | |
594 | ||
595 | if (!rpcauth_uptodatecred(task)) { | |
596 | task->tk_action = call_refresh; | |
597 | return; | |
598 | } | |
599 | ||
600 | task->tk_status = 0; | |
601 | task->tk_action = call_reserveresult; | |
602 | xprt_reserve(task); | |
603 | } | |
604 | ||
605 | /* | |
606 | * 1b. Grok the result of xprt_reserve() | |
607 | */ | |
608 | static void | |
609 | call_reserveresult(struct rpc_task *task) | |
610 | { | |
611 | int status = task->tk_status; | |
612 | ||
613 | dprintk("RPC: %4d call_reserveresult (status %d)\n", | |
614 | task->tk_pid, task->tk_status); | |
615 | ||
616 | /* | |
617 | * After a call to xprt_reserve(), we must have either | |
618 | * a request slot or else an error status. | |
619 | */ | |
620 | task->tk_status = 0; | |
621 | if (status >= 0) { | |
622 | if (task->tk_rqstp) { | |
623 | task->tk_action = call_allocate; | |
624 | return; | |
625 | } | |
626 | ||
627 | printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n", | |
628 | __FUNCTION__, status); | |
629 | rpc_exit(task, -EIO); | |
630 | return; | |
631 | } | |
632 | ||
633 | /* | |
634 | * Even though there was an error, we may have acquired | |
635 | * a request slot somehow. Make sure not to leak it. | |
636 | */ | |
637 | if (task->tk_rqstp) { | |
638 | printk(KERN_ERR "%s: status=%d, request allocated anyway\n", | |
639 | __FUNCTION__, status); | |
640 | xprt_release(task); | |
641 | } | |
642 | ||
643 | switch (status) { | |
644 | case -EAGAIN: /* woken up; retry */ | |
645 | task->tk_action = call_reserve; | |
646 | return; | |
647 | case -EIO: /* probably a shutdown */ | |
648 | break; | |
649 | default: | |
650 | printk(KERN_ERR "%s: unrecognized error %d, exiting\n", | |
651 | __FUNCTION__, status); | |
652 | break; | |
653 | } | |
654 | rpc_exit(task, status); | |
655 | } | |
656 | ||
657 | /* | |
658 | * 2. Allocate the buffer. For details, see sched.c:rpc_malloc. | |
02107148 | 659 | * (Note: buffer memory is freed in xprt_release). |
1da177e4 LT |
660 | */ |
661 | static void | |
662 | call_allocate(struct rpc_task *task) | |
663 | { | |
02107148 CL |
664 | struct rpc_rqst *req = task->tk_rqstp; |
665 | struct rpc_xprt *xprt = task->tk_xprt; | |
1da177e4 LT |
666 | unsigned int bufsiz; |
667 | ||
668 | dprintk("RPC: %4d call_allocate (status %d)\n", | |
669 | task->tk_pid, task->tk_status); | |
670 | task->tk_action = call_bind; | |
02107148 | 671 | if (req->rq_buffer) |
1da177e4 LT |
672 | return; |
673 | ||
674 | /* FIXME: compute buffer requirements more exactly using | |
675 | * auth->au_wslack */ | |
676 | bufsiz = task->tk_msg.rpc_proc->p_bufsiz + RPC_SLACK_SPACE; | |
677 | ||
02107148 | 678 | if (xprt->ops->buf_alloc(task, bufsiz << 1) != NULL) |
1da177e4 LT |
679 | return; |
680 | printk(KERN_INFO "RPC: buffer allocation failed for task %p\n", task); | |
681 | ||
14b218a8 | 682 | if (RPC_IS_ASYNC(task) || !signalled()) { |
1da177e4 LT |
683 | xprt_release(task); |
684 | task->tk_action = call_reserve; | |
685 | rpc_delay(task, HZ>>4); | |
686 | return; | |
687 | } | |
688 | ||
689 | rpc_exit(task, -ERESTARTSYS); | |
690 | } | |
691 | ||
940e3318 TM |
692 | static inline int |
693 | rpc_task_need_encode(struct rpc_task *task) | |
694 | { | |
695 | return task->tk_rqstp->rq_snd_buf.len == 0; | |
696 | } | |
697 | ||
698 | static inline void | |
699 | rpc_task_force_reencode(struct rpc_task *task) | |
700 | { | |
701 | task->tk_rqstp->rq_snd_buf.len = 0; | |
702 | } | |
703 | ||
1da177e4 LT |
704 | /* |
705 | * 3. Encode arguments of an RPC call | |
706 | */ | |
707 | static void | |
708 | call_encode(struct rpc_task *task) | |
709 | { | |
1da177e4 LT |
710 | struct rpc_rqst *req = task->tk_rqstp; |
711 | struct xdr_buf *sndbuf = &req->rq_snd_buf; | |
712 | struct xdr_buf *rcvbuf = &req->rq_rcv_buf; | |
713 | unsigned int bufsiz; | |
714 | kxdrproc_t encode; | |
1da177e4 LT |
715 | u32 *p; |
716 | ||
717 | dprintk("RPC: %4d call_encode (status %d)\n", | |
718 | task->tk_pid, task->tk_status); | |
719 | ||
720 | /* Default buffer setup */ | |
02107148 CL |
721 | bufsiz = req->rq_bufsize >> 1; |
722 | sndbuf->head[0].iov_base = (void *)req->rq_buffer; | |
1da177e4 LT |
723 | sndbuf->head[0].iov_len = bufsiz; |
724 | sndbuf->tail[0].iov_len = 0; | |
725 | sndbuf->page_len = 0; | |
726 | sndbuf->len = 0; | |
727 | sndbuf->buflen = bufsiz; | |
02107148 | 728 | rcvbuf->head[0].iov_base = (void *)((char *)req->rq_buffer + bufsiz); |
1da177e4 LT |
729 | rcvbuf->head[0].iov_len = bufsiz; |
730 | rcvbuf->tail[0].iov_len = 0; | |
731 | rcvbuf->page_len = 0; | |
732 | rcvbuf->len = 0; | |
733 | rcvbuf->buflen = bufsiz; | |
734 | ||
735 | /* Encode header and provided arguments */ | |
736 | encode = task->tk_msg.rpc_proc->p_encode; | |
737 | if (!(p = call_header(task))) { | |
738 | printk(KERN_INFO "RPC: call_header failed, exit EIO\n"); | |
739 | rpc_exit(task, -EIO); | |
740 | return; | |
741 | } | |
f3680312 BF |
742 | if (encode == NULL) |
743 | return; | |
744 | ||
745 | task->tk_status = rpcauth_wrap_req(task, encode, req, p, | |
746 | task->tk_msg.rpc_argp); | |
747 | if (task->tk_status == -ENOMEM) { | |
748 | /* XXX: Is this sane? */ | |
749 | rpc_delay(task, 3*HZ); | |
750 | task->tk_status = -EAGAIN; | |
751 | } | |
1da177e4 LT |
752 | } |
753 | ||
754 | /* | |
755 | * 4. Get the server port number if not yet set | |
756 | */ | |
757 | static void | |
758 | call_bind(struct rpc_task *task) | |
759 | { | |
760 | struct rpc_clnt *clnt = task->tk_client; | |
1da177e4 | 761 | |
da351878 CL |
762 | dprintk("RPC: %4d call_bind (status %d)\n", |
763 | task->tk_pid, task->tk_status); | |
1da177e4 | 764 | |
da351878 | 765 | task->tk_action = call_connect; |
1da177e4 | 766 | if (!clnt->cl_port) { |
da351878 | 767 | task->tk_action = call_bind_status; |
03bf4b70 | 768 | task->tk_timeout = task->tk_xprt->bind_timeout; |
1da177e4 LT |
769 | rpc_getport(task, clnt); |
770 | } | |
771 | } | |
772 | ||
773 | /* | |
da351878 CL |
774 | * 4a. Sort out bind result |
775 | */ | |
776 | static void | |
777 | call_bind_status(struct rpc_task *task) | |
778 | { | |
779 | int status = -EACCES; | |
780 | ||
781 | if (task->tk_status >= 0) { | |
782 | dprintk("RPC: %4d call_bind_status (status %d)\n", | |
783 | task->tk_pid, task->tk_status); | |
784 | task->tk_status = 0; | |
785 | task->tk_action = call_connect; | |
786 | return; | |
787 | } | |
788 | ||
789 | switch (task->tk_status) { | |
790 | case -EACCES: | |
791 | dprintk("RPC: %4d remote rpcbind: RPC program/version unavailable\n", | |
792 | task->tk_pid); | |
ea635a51 CL |
793 | rpc_delay(task, 3*HZ); |
794 | goto retry_bind; | |
da351878 CL |
795 | case -ETIMEDOUT: |
796 | dprintk("RPC: %4d rpcbind request timed out\n", | |
797 | task->tk_pid); | |
798 | if (RPC_IS_SOFT(task)) { | |
799 | status = -EIO; | |
800 | break; | |
801 | } | |
802 | goto retry_bind; | |
803 | case -EPFNOSUPPORT: | |
804 | dprintk("RPC: %4d remote rpcbind service unavailable\n", | |
805 | task->tk_pid); | |
806 | break; | |
807 | case -EPROTONOSUPPORT: | |
808 | dprintk("RPC: %4d remote rpcbind version 2 unavailable\n", | |
809 | task->tk_pid); | |
810 | break; | |
811 | default: | |
812 | dprintk("RPC: %4d unrecognized rpcbind error (%d)\n", | |
813 | task->tk_pid, -task->tk_status); | |
814 | status = -EIO; | |
815 | break; | |
816 | } | |
817 | ||
818 | rpc_exit(task, status); | |
819 | return; | |
820 | ||
821 | retry_bind: | |
822 | task->tk_status = 0; | |
823 | task->tk_action = call_bind; | |
824 | return; | |
825 | } | |
826 | ||
827 | /* | |
828 | * 4b. Connect to the RPC server | |
1da177e4 LT |
829 | */ |
830 | static void | |
831 | call_connect(struct rpc_task *task) | |
832 | { | |
da351878 | 833 | struct rpc_xprt *xprt = task->tk_xprt; |
1da177e4 | 834 | |
da351878 CL |
835 | dprintk("RPC: %4d call_connect xprt %p %s connected\n", |
836 | task->tk_pid, xprt, | |
837 | (xprt_connected(xprt) ? "is" : "is not")); | |
1da177e4 | 838 | |
da351878 CL |
839 | task->tk_action = call_transmit; |
840 | if (!xprt_connected(xprt)) { | |
841 | task->tk_action = call_connect_status; | |
842 | if (task->tk_status < 0) | |
843 | return; | |
844 | xprt_connect(task); | |
1da177e4 | 845 | } |
1da177e4 LT |
846 | } |
847 | ||
848 | /* | |
da351878 | 849 | * 4c. Sort out connect result |
1da177e4 LT |
850 | */ |
851 | static void | |
852 | call_connect_status(struct rpc_task *task) | |
853 | { | |
854 | struct rpc_clnt *clnt = task->tk_client; | |
855 | int status = task->tk_status; | |
856 | ||
da351878 CL |
857 | dprintk("RPC: %5u call_connect_status (status %d)\n", |
858 | task->tk_pid, task->tk_status); | |
859 | ||
1da177e4 LT |
860 | task->tk_status = 0; |
861 | if (status >= 0) { | |
862 | clnt->cl_stats->netreconn++; | |
863 | task->tk_action = call_transmit; | |
864 | return; | |
865 | } | |
866 | ||
da351878 | 867 | /* Something failed: remote service port may have changed */ |
35f5a422 | 868 | rpc_force_rebind(clnt); |
da351878 | 869 | |
1da177e4 LT |
870 | switch (status) { |
871 | case -ENOTCONN: | |
872 | case -ETIMEDOUT: | |
873 | case -EAGAIN: | |
da351878 | 874 | task->tk_action = call_bind; |
1da177e4 LT |
875 | break; |
876 | default: | |
877 | rpc_exit(task, -EIO); | |
da351878 | 878 | break; |
1da177e4 LT |
879 | } |
880 | } | |
881 | ||
882 | /* | |
883 | * 5. Transmit the RPC request, and wait for reply | |
884 | */ | |
885 | static void | |
886 | call_transmit(struct rpc_task *task) | |
887 | { | |
888 | dprintk("RPC: %4d call_transmit (status %d)\n", | |
889 | task->tk_pid, task->tk_status); | |
890 | ||
891 | task->tk_action = call_status; | |
892 | if (task->tk_status < 0) | |
893 | return; | |
894 | task->tk_status = xprt_prepare_transmit(task); | |
895 | if (task->tk_status != 0) | |
896 | return; | |
897 | /* Encode here so that rpcsec_gss can use correct sequence number. */ | |
940e3318 TM |
898 | if (rpc_task_need_encode(task)) { |
899 | task->tk_rqstp->rq_bytes_sent = 0; | |
1da177e4 | 900 | call_encode(task); |
5e5ce5be TM |
901 | /* Did the encode result in an error condition? */ |
902 | if (task->tk_status != 0) | |
903 | goto out_nosend; | |
904 | } | |
940e3318 | 905 | task->tk_action = call_transmit_status; |
1da177e4 LT |
906 | xprt_transmit(task); |
907 | if (task->tk_status < 0) | |
908 | return; | |
909 | if (!task->tk_msg.rpc_proc->p_decode) { | |
abbcf28f | 910 | task->tk_action = rpc_exit_task; |
1da177e4 LT |
911 | rpc_wake_up_task(task); |
912 | } | |
5e5ce5be TM |
913 | return; |
914 | out_nosend: | |
915 | /* release socket write lock before attempting to handle error */ | |
916 | xprt_abort_transmit(task); | |
940e3318 | 917 | rpc_task_force_reencode(task); |
1da177e4 LT |
918 | } |
919 | ||
920 | /* | |
921 | * 6. Sort out the RPC call status | |
922 | */ | |
923 | static void | |
924 | call_status(struct rpc_task *task) | |
925 | { | |
926 | struct rpc_clnt *clnt = task->tk_client; | |
927 | struct rpc_rqst *req = task->tk_rqstp; | |
928 | int status; | |
929 | ||
930 | if (req->rq_received > 0 && !req->rq_bytes_sent) | |
931 | task->tk_status = req->rq_received; | |
932 | ||
933 | dprintk("RPC: %4d call_status (status %d)\n", | |
934 | task->tk_pid, task->tk_status); | |
935 | ||
936 | status = task->tk_status; | |
937 | if (status >= 0) { | |
938 | task->tk_action = call_decode; | |
939 | return; | |
940 | } | |
941 | ||
942 | task->tk_status = 0; | |
943 | switch(status) { | |
944 | case -ETIMEDOUT: | |
945 | task->tk_action = call_timeout; | |
946 | break; | |
947 | case -ECONNREFUSED: | |
948 | case -ENOTCONN: | |
35f5a422 | 949 | rpc_force_rebind(clnt); |
1da177e4 LT |
950 | task->tk_action = call_bind; |
951 | break; | |
952 | case -EAGAIN: | |
953 | task->tk_action = call_transmit; | |
954 | break; | |
955 | case -EIO: | |
956 | /* shutdown or soft timeout */ | |
957 | rpc_exit(task, status); | |
958 | break; | |
959 | default: | |
f518e35a | 960 | printk("%s: RPC call returned error %d\n", |
1da177e4 LT |
961 | clnt->cl_protname, -status); |
962 | rpc_exit(task, status); | |
963 | break; | |
964 | } | |
965 | } | |
966 | ||
967 | /* | |
940e3318 TM |
968 | * 6a. Handle transmission errors. |
969 | */ | |
970 | static void | |
971 | call_transmit_status(struct rpc_task *task) | |
972 | { | |
973 | if (task->tk_status != -EAGAIN) | |
974 | rpc_task_force_reencode(task); | |
975 | call_status(task); | |
976 | } | |
977 | ||
978 | /* | |
979 | * 6b. Handle RPC timeout | |
1da177e4 LT |
980 | * We do not release the request slot, so we keep using the |
981 | * same XID for all retransmits. | |
982 | */ | |
983 | static void | |
984 | call_timeout(struct rpc_task *task) | |
985 | { | |
986 | struct rpc_clnt *clnt = task->tk_client; | |
987 | ||
988 | if (xprt_adjust_timeout(task->tk_rqstp) == 0) { | |
989 | dprintk("RPC: %4d call_timeout (minor)\n", task->tk_pid); | |
990 | goto retry; | |
991 | } | |
992 | ||
993 | dprintk("RPC: %4d call_timeout (major)\n", task->tk_pid); | |
994 | if (RPC_IS_SOFT(task)) { | |
f518e35a | 995 | printk(KERN_NOTICE "%s: server %s not responding, timed out\n", |
1da177e4 LT |
996 | clnt->cl_protname, clnt->cl_server); |
997 | rpc_exit(task, -EIO); | |
998 | return; | |
999 | } | |
1000 | ||
f518e35a | 1001 | if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) { |
1da177e4 LT |
1002 | task->tk_flags |= RPC_CALL_MAJORSEEN; |
1003 | printk(KERN_NOTICE "%s: server %s not responding, still trying\n", | |
1004 | clnt->cl_protname, clnt->cl_server); | |
1005 | } | |
35f5a422 | 1006 | rpc_force_rebind(clnt); |
1da177e4 LT |
1007 | |
1008 | retry: | |
1009 | clnt->cl_stats->rpcretrans++; | |
1010 | task->tk_action = call_bind; | |
1011 | task->tk_status = 0; | |
1012 | } | |
1013 | ||
1014 | /* | |
1015 | * 7. Decode the RPC reply | |
1016 | */ | |
1017 | static void | |
1018 | call_decode(struct rpc_task *task) | |
1019 | { | |
1020 | struct rpc_clnt *clnt = task->tk_client; | |
1021 | struct rpc_rqst *req = task->tk_rqstp; | |
1022 | kxdrproc_t decode = task->tk_msg.rpc_proc->p_decode; | |
1023 | u32 *p; | |
1024 | ||
1025 | dprintk("RPC: %4d call_decode (status %d)\n", | |
1026 | task->tk_pid, task->tk_status); | |
1027 | ||
f518e35a | 1028 | if (task->tk_flags & RPC_CALL_MAJORSEEN) { |
1da177e4 LT |
1029 | printk(KERN_NOTICE "%s: server %s OK\n", |
1030 | clnt->cl_protname, clnt->cl_server); | |
1031 | task->tk_flags &= ~RPC_CALL_MAJORSEEN; | |
1032 | } | |
1033 | ||
1034 | if (task->tk_status < 12) { | |
1035 | if (!RPC_IS_SOFT(task)) { | |
1036 | task->tk_action = call_bind; | |
1037 | clnt->cl_stats->rpcretrans++; | |
1038 | goto out_retry; | |
1039 | } | |
1040 | printk(KERN_WARNING "%s: too small RPC reply size (%d bytes)\n", | |
1041 | clnt->cl_protname, task->tk_status); | |
1042 | rpc_exit(task, -EIO); | |
1043 | return; | |
1044 | } | |
1045 | ||
1046 | req->rq_rcv_buf.len = req->rq_private_buf.len; | |
1047 | ||
1048 | /* Check that the softirq receive buffer is valid */ | |
1049 | WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf, | |
1050 | sizeof(req->rq_rcv_buf)) != 0); | |
1051 | ||
1052 | /* Verify the RPC header */ | |
abbcf28f TM |
1053 | p = call_verify(task); |
1054 | if (IS_ERR(p)) { | |
1055 | if (p == ERR_PTR(-EAGAIN)) | |
1056 | goto out_retry; | |
1057 | return; | |
1da177e4 LT |
1058 | } |
1059 | ||
abbcf28f | 1060 | task->tk_action = rpc_exit_task; |
1da177e4 LT |
1061 | |
1062 | if (decode) | |
1063 | task->tk_status = rpcauth_unwrap_resp(task, decode, req, p, | |
1064 | task->tk_msg.rpc_resp); | |
1065 | dprintk("RPC: %4d call_decode result %d\n", task->tk_pid, | |
1066 | task->tk_status); | |
1067 | return; | |
1068 | out_retry: | |
1069 | req->rq_received = req->rq_private_buf.len = 0; | |
1070 | task->tk_status = 0; | |
1071 | } | |
1072 | ||
1073 | /* | |
1074 | * 8. Refresh the credentials if rejected by the server | |
1075 | */ | |
1076 | static void | |
1077 | call_refresh(struct rpc_task *task) | |
1078 | { | |
1079 | dprintk("RPC: %4d call_refresh\n", task->tk_pid); | |
1080 | ||
1081 | xprt_release(task); /* Must do to obtain new XID */ | |
1082 | task->tk_action = call_refreshresult; | |
1083 | task->tk_status = 0; | |
1084 | task->tk_client->cl_stats->rpcauthrefresh++; | |
1085 | rpcauth_refreshcred(task); | |
1086 | } | |
1087 | ||
1088 | /* | |
1089 | * 8a. Process the results of a credential refresh | |
1090 | */ | |
1091 | static void | |
1092 | call_refreshresult(struct rpc_task *task) | |
1093 | { | |
1094 | int status = task->tk_status; | |
1095 | dprintk("RPC: %4d call_refreshresult (status %d)\n", | |
1096 | task->tk_pid, task->tk_status); | |
1097 | ||
1098 | task->tk_status = 0; | |
1099 | task->tk_action = call_reserve; | |
1100 | if (status >= 0 && rpcauth_uptodatecred(task)) | |
1101 | return; | |
1102 | if (status == -EACCES) { | |
1103 | rpc_exit(task, -EACCES); | |
1104 | return; | |
1105 | } | |
1106 | task->tk_action = call_refresh; | |
1107 | if (status != -ETIMEDOUT) | |
1108 | rpc_delay(task, 3*HZ); | |
1109 | return; | |
1110 | } | |
1111 | ||
1112 | /* | |
1113 | * Call header serialization | |
1114 | */ | |
1115 | static u32 * | |
1116 | call_header(struct rpc_task *task) | |
1117 | { | |
1118 | struct rpc_clnt *clnt = task->tk_client; | |
1da177e4 LT |
1119 | struct rpc_rqst *req = task->tk_rqstp; |
1120 | u32 *p = req->rq_svec[0].iov_base; | |
1121 | ||
1122 | /* FIXME: check buffer size? */ | |
808012fb CL |
1123 | |
1124 | p = xprt_skip_transport_header(task->tk_xprt, p); | |
1da177e4 LT |
1125 | *p++ = req->rq_xid; /* XID */ |
1126 | *p++ = htonl(RPC_CALL); /* CALL */ | |
1127 | *p++ = htonl(RPC_VERSION); /* RPC version */ | |
1128 | *p++ = htonl(clnt->cl_prog); /* program number */ | |
1129 | *p++ = htonl(clnt->cl_vers); /* program version */ | |
1130 | *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */ | |
334ccfd5 TM |
1131 | p = rpcauth_marshcred(task, p); |
1132 | req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p); | |
1133 | return p; | |
1da177e4 LT |
1134 | } |
1135 | ||
1136 | /* | |
1137 | * Reply header verification | |
1138 | */ | |
1139 | static u32 * | |
1140 | call_verify(struct rpc_task *task) | |
1141 | { | |
1142 | struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0]; | |
1143 | int len = task->tk_rqstp->rq_rcv_buf.len >> 2; | |
1144 | u32 *p = iov->iov_base, n; | |
1145 | int error = -EACCES; | |
1146 | ||
1147 | if ((len -= 3) < 0) | |
1148 | goto out_overflow; | |
1149 | p += 1; /* skip XID */ | |
1150 | ||
1151 | if ((n = ntohl(*p++)) != RPC_REPLY) { | |
1152 | printk(KERN_WARNING "call_verify: not an RPC reply: %x\n", n); | |
abbcf28f | 1153 | goto out_garbage; |
1da177e4 LT |
1154 | } |
1155 | if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) { | |
1156 | if (--len < 0) | |
1157 | goto out_overflow; | |
1158 | switch ((n = ntohl(*p++))) { | |
1159 | case RPC_AUTH_ERROR: | |
1160 | break; | |
1161 | case RPC_MISMATCH: | |
cdf47706 AG |
1162 | dprintk("%s: RPC call version mismatch!\n", __FUNCTION__); |
1163 | error = -EPROTONOSUPPORT; | |
1164 | goto out_err; | |
1da177e4 | 1165 | default: |
cdf47706 | 1166 | dprintk("%s: RPC call rejected, unknown error: %x\n", __FUNCTION__, n); |
1da177e4 LT |
1167 | goto out_eio; |
1168 | } | |
1169 | if (--len < 0) | |
1170 | goto out_overflow; | |
1171 | switch ((n = ntohl(*p++))) { | |
1172 | case RPC_AUTH_REJECTEDCRED: | |
1173 | case RPC_AUTH_REJECTEDVERF: | |
1174 | case RPCSEC_GSS_CREDPROBLEM: | |
1175 | case RPCSEC_GSS_CTXPROBLEM: | |
1176 | if (!task->tk_cred_retry) | |
1177 | break; | |
1178 | task->tk_cred_retry--; | |
1179 | dprintk("RPC: %4d call_verify: retry stale creds\n", | |
1180 | task->tk_pid); | |
1181 | rpcauth_invalcred(task); | |
1182 | task->tk_action = call_refresh; | |
abbcf28f | 1183 | goto out_retry; |
1da177e4 LT |
1184 | case RPC_AUTH_BADCRED: |
1185 | case RPC_AUTH_BADVERF: | |
1186 | /* possibly garbled cred/verf? */ | |
1187 | if (!task->tk_garb_retry) | |
1188 | break; | |
1189 | task->tk_garb_retry--; | |
1190 | dprintk("RPC: %4d call_verify: retry garbled creds\n", | |
1191 | task->tk_pid); | |
1192 | task->tk_action = call_bind; | |
abbcf28f | 1193 | goto out_retry; |
1da177e4 LT |
1194 | case RPC_AUTH_TOOWEAK: |
1195 | printk(KERN_NOTICE "call_verify: server requires stronger " | |
1196 | "authentication.\n"); | |
1197 | break; | |
1198 | default: | |
1199 | printk(KERN_WARNING "call_verify: unknown auth error: %x\n", n); | |
1200 | error = -EIO; | |
1201 | } | |
1202 | dprintk("RPC: %4d call_verify: call rejected %d\n", | |
1203 | task->tk_pid, n); | |
1204 | goto out_err; | |
1205 | } | |
1206 | if (!(p = rpcauth_checkverf(task, p))) { | |
1207 | printk(KERN_WARNING "call_verify: auth check failed\n"); | |
abbcf28f | 1208 | goto out_garbage; /* bad verifier, retry */ |
1da177e4 LT |
1209 | } |
1210 | len = p - (u32 *)iov->iov_base - 1; | |
1211 | if (len < 0) | |
1212 | goto out_overflow; | |
1213 | switch ((n = ntohl(*p++))) { | |
1214 | case RPC_SUCCESS: | |
1215 | return p; | |
1216 | case RPC_PROG_UNAVAIL: | |
cdf47706 | 1217 | dprintk("RPC: call_verify: program %u is unsupported by server %s\n", |
1da177e4 LT |
1218 | (unsigned int)task->tk_client->cl_prog, |
1219 | task->tk_client->cl_server); | |
cdf47706 AG |
1220 | error = -EPFNOSUPPORT; |
1221 | goto out_err; | |
1da177e4 | 1222 | case RPC_PROG_MISMATCH: |
cdf47706 | 1223 | dprintk("RPC: call_verify: program %u, version %u unsupported by server %s\n", |
1da177e4 LT |
1224 | (unsigned int)task->tk_client->cl_prog, |
1225 | (unsigned int)task->tk_client->cl_vers, | |
1226 | task->tk_client->cl_server); | |
cdf47706 AG |
1227 | error = -EPROTONOSUPPORT; |
1228 | goto out_err; | |
1da177e4 | 1229 | case RPC_PROC_UNAVAIL: |
cdf47706 | 1230 | dprintk("RPC: call_verify: proc %p unsupported by program %u, version %u on server %s\n", |
1da177e4 LT |
1231 | task->tk_msg.rpc_proc, |
1232 | task->tk_client->cl_prog, | |
1233 | task->tk_client->cl_vers, | |
1234 | task->tk_client->cl_server); | |
cdf47706 AG |
1235 | error = -EOPNOTSUPP; |
1236 | goto out_err; | |
1da177e4 LT |
1237 | case RPC_GARBAGE_ARGS: |
1238 | dprintk("RPC: %4d %s: server saw garbage\n", task->tk_pid, __FUNCTION__); | |
1239 | break; /* retry */ | |
1240 | default: | |
1241 | printk(KERN_WARNING "call_verify: server accept status: %x\n", n); | |
1242 | /* Also retry */ | |
1243 | } | |
1244 | ||
abbcf28f | 1245 | out_garbage: |
1da177e4 LT |
1246 | task->tk_client->cl_stats->rpcgarbage++; |
1247 | if (task->tk_garb_retry) { | |
1248 | task->tk_garb_retry--; | |
cdf47706 | 1249 | dprintk("RPC %s: retrying %4d\n", __FUNCTION__, task->tk_pid); |
1da177e4 | 1250 | task->tk_action = call_bind; |
abbcf28f TM |
1251 | out_retry: |
1252 | return ERR_PTR(-EAGAIN); | |
1da177e4 LT |
1253 | } |
1254 | printk(KERN_WARNING "RPC %s: retry failed, exit EIO\n", __FUNCTION__); | |
1255 | out_eio: | |
1256 | error = -EIO; | |
1257 | out_err: | |
1258 | rpc_exit(task, error); | |
abbcf28f | 1259 | return ERR_PTR(error); |
1da177e4 LT |
1260 | out_overflow: |
1261 | printk(KERN_WARNING "RPC %s: server reply was truncated.\n", __FUNCTION__); | |
abbcf28f | 1262 | goto out_garbage; |
1da177e4 | 1263 | } |
5ee0ed7d TM |
1264 | |
1265 | static int rpcproc_encode_null(void *rqstp, u32 *data, void *obj) | |
1266 | { | |
1267 | return 0; | |
1268 | } | |
1269 | ||
1270 | static int rpcproc_decode_null(void *rqstp, u32 *data, void *obj) | |
1271 | { | |
1272 | return 0; | |
1273 | } | |
1274 | ||
1275 | static struct rpc_procinfo rpcproc_null = { | |
1276 | .p_encode = rpcproc_encode_null, | |
1277 | .p_decode = rpcproc_decode_null, | |
1278 | }; | |
1279 | ||
1280 | int rpc_ping(struct rpc_clnt *clnt, int flags) | |
1281 | { | |
1282 | struct rpc_message msg = { | |
1283 | .rpc_proc = &rpcproc_null, | |
1284 | }; | |
1285 | int err; | |
1286 | msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0); | |
1287 | err = rpc_call_sync(clnt, &msg, flags); | |
1288 | put_rpccred(msg.rpc_cred); | |
1289 | return err; | |
1290 | } |