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 | 30 | #include <linux/utsname.h> |
11c556b3 | 31 | #include <linux/workqueue.h> |
1da177e4 LT |
32 | |
33 | #include <linux/sunrpc/clnt.h> | |
1da177e4 | 34 | #include <linux/sunrpc/rpc_pipe_fs.h> |
11c556b3 | 35 | #include <linux/sunrpc/metrics.h> |
1da177e4 LT |
36 | |
37 | ||
38 | #define RPC_SLACK_SPACE (1024) /* total overkill */ | |
39 | ||
40 | #ifdef RPC_DEBUG | |
41 | # define RPCDBG_FACILITY RPCDBG_CALL | |
42 | #endif | |
43 | ||
44 | static DECLARE_WAIT_QUEUE_HEAD(destroy_wait); | |
45 | ||
46 | ||
47 | static void call_start(struct rpc_task *task); | |
48 | static void call_reserve(struct rpc_task *task); | |
49 | static void call_reserveresult(struct rpc_task *task); | |
50 | static void call_allocate(struct rpc_task *task); | |
51 | static void call_encode(struct rpc_task *task); | |
52 | static void call_decode(struct rpc_task *task); | |
53 | static void call_bind(struct rpc_task *task); | |
da351878 | 54 | static void call_bind_status(struct rpc_task *task); |
1da177e4 LT |
55 | static void call_transmit(struct rpc_task *task); |
56 | static void call_status(struct rpc_task *task); | |
940e3318 | 57 | static void call_transmit_status(struct rpc_task *task); |
1da177e4 LT |
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 | { | |
f134585a | 70 | static uint32_t clntid; |
1da177e4 LT |
71 | int error; |
72 | ||
73 | if (dir_name == NULL) | |
74 | return 0; | |
f134585a TM |
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; | |
1da177e4 | 83 | error = PTR_ERR(clnt->cl_dentry); |
f134585a TM |
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 | } | |
1da177e4 LT |
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) | |
712917d1 | 115 | goto out_no_xprt; |
1da177e4 LT |
116 | if (vers >= program->nrvers || !(version = program->version[vers])) |
117 | goto out_err; | |
118 | ||
119 | err = -ENOMEM; | |
8b3a7005 | 120 | clnt = kmalloc(sizeof(*clnt), GFP_KERNEL); |
1da177e4 LT |
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; | |
11c556b3 | 149 | clnt->cl_metrics = rpc_alloc_iostats(clnt); |
1da177e4 LT |
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); |
712917d1 | 185 | out_no_xprt: |
1da177e4 LT |
186 | return ERR_PTR(err); |
187 | } | |
188 | ||
5ee0ed7d TM |
189 | /** |
190 | * Create an RPC client | |
191 | * @xprt - pointer to xprt struct | |
192 | * @servname - name of server | |
193 | * @info - rpc_program | |
194 | * @version - rpc_program version | |
195 | * @authflavor - rpc_auth flavour to use | |
196 | * | |
197 | * Creates an RPC client structure, then pings the server in order to | |
198 | * determine if it is up, and if it supports this program and version. | |
199 | * | |
200 | * This function should never be called by asynchronous tasks such as | |
201 | * the portmapper. | |
202 | */ | |
203 | struct rpc_clnt *rpc_create_client(struct rpc_xprt *xprt, char *servname, | |
204 | struct rpc_program *info, u32 version, rpc_authflavor_t authflavor) | |
205 | { | |
206 | struct rpc_clnt *clnt; | |
207 | int err; | |
208 | ||
209 | clnt = rpc_new_client(xprt, servname, info, version, authflavor); | |
210 | if (IS_ERR(clnt)) | |
211 | return clnt; | |
212 | err = rpc_ping(clnt, RPC_TASK_SOFT|RPC_TASK_NOINTR); | |
213 | if (err == 0) | |
214 | return clnt; | |
215 | rpc_shutdown_client(clnt); | |
216 | return ERR_PTR(err); | |
217 | } | |
218 | ||
1da177e4 LT |
219 | /* |
220 | * This function clones the RPC client structure. It allows us to share the | |
221 | * same transport while varying parameters such as the authentication | |
222 | * flavour. | |
223 | */ | |
224 | struct rpc_clnt * | |
225 | rpc_clone_client(struct rpc_clnt *clnt) | |
226 | { | |
227 | struct rpc_clnt *new; | |
228 | ||
8b3a7005 | 229 | new = kmalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
230 | if (!new) |
231 | goto out_no_clnt; | |
232 | memcpy(new, clnt, sizeof(*new)); | |
233 | atomic_set(&new->cl_count, 1); | |
234 | atomic_set(&new->cl_users, 0); | |
235 | new->cl_parent = clnt; | |
236 | atomic_inc(&clnt->cl_count); | |
237 | /* Duplicate portmapper */ | |
238 | rpc_init_wait_queue(&new->cl_pmap_default.pm_bindwait, "bindwait"); | |
239 | /* Turn off autobind on clones */ | |
240 | new->cl_autobind = 0; | |
241 | new->cl_oneshot = 0; | |
242 | new->cl_dead = 0; | |
12de3b35 | 243 | dget(new->cl_dentry); |
1da177e4 LT |
244 | rpc_init_rtt(&new->cl_rtt_default, clnt->cl_xprt->timeout.to_initval); |
245 | if (new->cl_auth) | |
246 | atomic_inc(&new->cl_auth->au_count); | |
007e251f | 247 | new->cl_pmap = &new->cl_pmap_default; |
11c556b3 | 248 | new->cl_metrics = rpc_alloc_iostats(clnt); |
007e251f | 249 | rpc_init_wait_queue(&new->cl_pmap_default.pm_bindwait, "bindwait"); |
1da177e4 LT |
250 | return new; |
251 | out_no_clnt: | |
252 | printk(KERN_INFO "RPC: out of memory in %s\n", __FUNCTION__); | |
253 | return ERR_PTR(-ENOMEM); | |
254 | } | |
255 | ||
256 | /* | |
257 | * Properly shut down an RPC client, terminating all outstanding | |
258 | * requests. Note that we must be certain that cl_oneshot and | |
259 | * cl_dead are cleared, or else the client would be destroyed | |
260 | * when the last task releases it. | |
261 | */ | |
262 | int | |
263 | rpc_shutdown_client(struct rpc_clnt *clnt) | |
264 | { | |
265 | dprintk("RPC: shutting down %s client for %s, tasks=%d\n", | |
266 | clnt->cl_protname, clnt->cl_server, | |
267 | atomic_read(&clnt->cl_users)); | |
268 | ||
269 | while (atomic_read(&clnt->cl_users) > 0) { | |
270 | /* Don't let rpc_release_client destroy us */ | |
271 | clnt->cl_oneshot = 0; | |
272 | clnt->cl_dead = 0; | |
273 | rpc_killall_tasks(clnt); | |
532347e2 | 274 | wait_event_timeout(destroy_wait, |
4f47707b | 275 | !atomic_read(&clnt->cl_users), 1*HZ); |
1da177e4 LT |
276 | } |
277 | ||
278 | if (atomic_read(&clnt->cl_users) < 0) { | |
279 | printk(KERN_ERR "RPC: rpc_shutdown_client clnt %p tasks=%d\n", | |
280 | clnt, atomic_read(&clnt->cl_users)); | |
281 | #ifdef RPC_DEBUG | |
282 | rpc_show_tasks(); | |
283 | #endif | |
284 | BUG(); | |
285 | } | |
286 | ||
287 | return rpc_destroy_client(clnt); | |
288 | } | |
289 | ||
290 | /* | |
291 | * Delete an RPC client | |
292 | */ | |
293 | int | |
294 | rpc_destroy_client(struct rpc_clnt *clnt) | |
295 | { | |
296 | if (!atomic_dec_and_test(&clnt->cl_count)) | |
297 | return 1; | |
298 | BUG_ON(atomic_read(&clnt->cl_users) != 0); | |
299 | ||
300 | dprintk("RPC: destroying %s client for %s\n", | |
301 | clnt->cl_protname, clnt->cl_server); | |
302 | if (clnt->cl_auth) { | |
303 | rpcauth_destroy(clnt->cl_auth); | |
304 | clnt->cl_auth = NULL; | |
305 | } | |
306 | if (clnt->cl_parent != clnt) { | |
307 | rpc_destroy_client(clnt->cl_parent); | |
308 | goto out_free; | |
309 | } | |
f134585a TM |
310 | if (clnt->cl_pathname[0]) |
311 | rpc_rmdir(clnt->cl_pathname); | |
1da177e4 LT |
312 | if (clnt->cl_xprt) { |
313 | xprt_destroy(clnt->cl_xprt); | |
314 | clnt->cl_xprt = NULL; | |
315 | } | |
316 | if (clnt->cl_server != clnt->cl_inline_name) | |
317 | kfree(clnt->cl_server); | |
318 | out_free: | |
11c556b3 CL |
319 | rpc_free_iostats(clnt->cl_metrics); |
320 | clnt->cl_metrics = NULL; | |
12de3b35 TM |
321 | if (clnt->cl_dentry) |
322 | dput(clnt->cl_dentry); | |
1da177e4 LT |
323 | kfree(clnt); |
324 | return 0; | |
325 | } | |
326 | ||
327 | /* | |
328 | * Release an RPC client | |
329 | */ | |
330 | void | |
331 | rpc_release_client(struct rpc_clnt *clnt) | |
332 | { | |
333 | dprintk("RPC: rpc_release_client(%p, %d)\n", | |
334 | clnt, atomic_read(&clnt->cl_users)); | |
335 | ||
336 | if (!atomic_dec_and_test(&clnt->cl_users)) | |
337 | return; | |
338 | wake_up(&destroy_wait); | |
339 | if (clnt->cl_oneshot || clnt->cl_dead) | |
340 | rpc_destroy_client(clnt); | |
341 | } | |
342 | ||
007e251f AG |
343 | /** |
344 | * rpc_bind_new_program - bind a new RPC program to an existing client | |
345 | * @old - old rpc_client | |
346 | * @program - rpc program to set | |
347 | * @vers - rpc program version | |
348 | * | |
349 | * Clones the rpc client and sets up a new RPC program. This is mainly | |
350 | * of use for enabling different RPC programs to share the same transport. | |
351 | * The Sun NFSv2/v3 ACL protocol can do this. | |
352 | */ | |
353 | struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old, | |
354 | struct rpc_program *program, | |
355 | int vers) | |
356 | { | |
357 | struct rpc_clnt *clnt; | |
358 | struct rpc_version *version; | |
359 | int err; | |
360 | ||
361 | BUG_ON(vers >= program->nrvers || !program->version[vers]); | |
362 | version = program->version[vers]; | |
363 | clnt = rpc_clone_client(old); | |
364 | if (IS_ERR(clnt)) | |
365 | goto out; | |
366 | clnt->cl_procinfo = version->procs; | |
367 | clnt->cl_maxproc = version->nrprocs; | |
368 | clnt->cl_protname = program->name; | |
369 | clnt->cl_prog = program->number; | |
370 | clnt->cl_vers = version->number; | |
371 | clnt->cl_stats = program->stats; | |
372 | err = rpc_ping(clnt, RPC_TASK_SOFT|RPC_TASK_NOINTR); | |
373 | if (err != 0) { | |
374 | rpc_shutdown_client(clnt); | |
375 | clnt = ERR_PTR(err); | |
376 | } | |
377 | out: | |
378 | return clnt; | |
379 | } | |
380 | ||
1da177e4 LT |
381 | /* |
382 | * Default callback for async RPC calls | |
383 | */ | |
384 | static void | |
963d8fe5 | 385 | rpc_default_callback(struct rpc_task *task, void *data) |
1da177e4 LT |
386 | { |
387 | } | |
388 | ||
963d8fe5 TM |
389 | static const struct rpc_call_ops rpc_default_ops = { |
390 | .rpc_call_done = rpc_default_callback, | |
391 | }; | |
392 | ||
1da177e4 | 393 | /* |
14b218a8 | 394 | * Export the signal mask handling for synchronous code that |
1da177e4 LT |
395 | * sleeps on RPC calls |
396 | */ | |
2bd61579 | 397 | #define RPC_INTR_SIGNALS (sigmask(SIGHUP) | sigmask(SIGINT) | sigmask(SIGQUIT) | sigmask(SIGTERM)) |
1da177e4 | 398 | |
14b218a8 TM |
399 | static void rpc_save_sigmask(sigset_t *oldset, int intr) |
400 | { | |
2bd61579 | 401 | unsigned long sigallow = sigmask(SIGKILL); |
14b218a8 TM |
402 | sigset_t sigmask; |
403 | ||
404 | /* Block all signals except those listed in sigallow */ | |
405 | if (intr) | |
406 | sigallow |= RPC_INTR_SIGNALS; | |
407 | siginitsetinv(&sigmask, sigallow); | |
408 | sigprocmask(SIG_BLOCK, &sigmask, oldset); | |
409 | } | |
410 | ||
411 | static inline void rpc_task_sigmask(struct rpc_task *task, sigset_t *oldset) | |
412 | { | |
413 | rpc_save_sigmask(oldset, !RPC_TASK_UNINTERRUPTIBLE(task)); | |
414 | } | |
415 | ||
416 | static inline void rpc_restore_sigmask(sigset_t *oldset) | |
417 | { | |
418 | sigprocmask(SIG_SETMASK, oldset, NULL); | |
419 | } | |
420 | ||
1da177e4 LT |
421 | void rpc_clnt_sigmask(struct rpc_clnt *clnt, sigset_t *oldset) |
422 | { | |
14b218a8 | 423 | rpc_save_sigmask(oldset, clnt->cl_intr); |
1da177e4 LT |
424 | } |
425 | ||
426 | void rpc_clnt_sigunmask(struct rpc_clnt *clnt, sigset_t *oldset) | |
427 | { | |
14b218a8 | 428 | rpc_restore_sigmask(oldset); |
1da177e4 LT |
429 | } |
430 | ||
431 | /* | |
432 | * New rpc_call implementation | |
433 | */ | |
434 | int rpc_call_sync(struct rpc_clnt *clnt, struct rpc_message *msg, int flags) | |
435 | { | |
436 | struct rpc_task *task; | |
437 | sigset_t oldset; | |
438 | int status; | |
439 | ||
440 | /* If this client is slain all further I/O fails */ | |
441 | if (clnt->cl_dead) | |
442 | return -EIO; | |
443 | ||
444 | BUG_ON(flags & RPC_TASK_ASYNC); | |
445 | ||
1da177e4 | 446 | status = -ENOMEM; |
963d8fe5 | 447 | task = rpc_new_task(clnt, flags, &rpc_default_ops, NULL); |
1da177e4 LT |
448 | if (task == NULL) |
449 | goto out; | |
450 | ||
14b218a8 TM |
451 | /* Mask signals on RPC calls _and_ GSS_AUTH upcalls */ |
452 | rpc_task_sigmask(task, &oldset); | |
453 | ||
1da177e4 LT |
454 | rpc_call_setup(task, msg, 0); |
455 | ||
456 | /* Set up the call info struct and execute the task */ | |
e60859ac TM |
457 | status = task->tk_status; |
458 | if (status == 0) { | |
459 | atomic_inc(&task->tk_count); | |
1da177e4 | 460 | status = rpc_execute(task); |
e60859ac TM |
461 | if (status == 0) |
462 | status = task->tk_status; | |
1da177e4 | 463 | } |
14b218a8 | 464 | rpc_restore_sigmask(&oldset); |
e60859ac | 465 | rpc_release_task(task); |
1da177e4 | 466 | out: |
1da177e4 LT |
467 | return status; |
468 | } | |
469 | ||
470 | /* | |
471 | * New rpc_call implementation | |
472 | */ | |
473 | int | |
474 | rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, int flags, | |
963d8fe5 | 475 | const struct rpc_call_ops *tk_ops, void *data) |
1da177e4 LT |
476 | { |
477 | struct rpc_task *task; | |
478 | sigset_t oldset; | |
479 | int status; | |
480 | ||
481 | /* If this client is slain all further I/O fails */ | |
482 | if (clnt->cl_dead) | |
483 | return -EIO; | |
484 | ||
485 | flags |= RPC_TASK_ASYNC; | |
486 | ||
1da177e4 | 487 | /* Create/initialize a new RPC task */ |
1da177e4 | 488 | status = -ENOMEM; |
963d8fe5 | 489 | if (!(task = rpc_new_task(clnt, flags, tk_ops, data))) |
1da177e4 | 490 | goto out; |
1da177e4 | 491 | |
14b218a8 TM |
492 | /* Mask signals on GSS_AUTH upcalls */ |
493 | rpc_task_sigmask(task, &oldset); | |
494 | ||
1da177e4 LT |
495 | rpc_call_setup(task, msg, 0); |
496 | ||
497 | /* Set up the call info struct and execute the task */ | |
498 | status = task->tk_status; | |
499 | if (status == 0) | |
500 | rpc_execute(task); | |
501 | else | |
502 | rpc_release_task(task); | |
503 | ||
14b218a8 | 504 | rpc_restore_sigmask(&oldset); |
1da177e4 | 505 | out: |
1da177e4 LT |
506 | return status; |
507 | } | |
508 | ||
509 | ||
510 | void | |
511 | rpc_call_setup(struct rpc_task *task, struct rpc_message *msg, int flags) | |
512 | { | |
513 | task->tk_msg = *msg; | |
514 | task->tk_flags |= flags; | |
515 | /* Bind the user cred */ | |
516 | if (task->tk_msg.rpc_cred != NULL) | |
517 | rpcauth_holdcred(task); | |
518 | else | |
519 | rpcauth_bindcred(task); | |
520 | ||
521 | if (task->tk_status == 0) | |
522 | task->tk_action = call_start; | |
523 | else | |
abbcf28f | 524 | task->tk_action = rpc_exit_task; |
1da177e4 LT |
525 | } |
526 | ||
527 | void | |
528 | rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize) | |
529 | { | |
530 | struct rpc_xprt *xprt = clnt->cl_xprt; | |
470056c2 CL |
531 | if (xprt->ops->set_buffer_size) |
532 | xprt->ops->set_buffer_size(xprt, sndsize, rcvsize); | |
1da177e4 LT |
533 | } |
534 | ||
535 | /* | |
536 | * Return size of largest payload RPC client can support, in bytes | |
537 | * | |
538 | * For stream transports, this is one RPC record fragment (see RFC | |
539 | * 1831), as we don't support multi-record requests yet. For datagram | |
540 | * transports, this is the size of an IP packet minus the IP, UDP, and | |
541 | * RPC header sizes. | |
542 | */ | |
543 | size_t rpc_max_payload(struct rpc_clnt *clnt) | |
544 | { | |
545 | return clnt->cl_xprt->max_payload; | |
546 | } | |
547 | EXPORT_SYMBOL(rpc_max_payload); | |
548 | ||
35f5a422 CL |
549 | /** |
550 | * rpc_force_rebind - force transport to check that remote port is unchanged | |
551 | * @clnt: client to rebind | |
552 | * | |
553 | */ | |
554 | void rpc_force_rebind(struct rpc_clnt *clnt) | |
555 | { | |
556 | if (clnt->cl_autobind) | |
557 | clnt->cl_port = 0; | |
558 | } | |
559 | EXPORT_SYMBOL(rpc_force_rebind); | |
560 | ||
1da177e4 LT |
561 | /* |
562 | * Restart an (async) RPC call. Usually called from within the | |
563 | * exit handler. | |
564 | */ | |
565 | void | |
566 | rpc_restart_call(struct rpc_task *task) | |
567 | { | |
568 | if (RPC_ASSASSINATED(task)) | |
569 | return; | |
570 | ||
571 | task->tk_action = call_start; | |
572 | } | |
573 | ||
574 | /* | |
575 | * 0. Initial state | |
576 | * | |
577 | * Other FSM states can be visited zero or more times, but | |
578 | * this state is visited exactly once for each RPC. | |
579 | */ | |
580 | static void | |
581 | call_start(struct rpc_task *task) | |
582 | { | |
583 | struct rpc_clnt *clnt = task->tk_client; | |
584 | ||
585 | dprintk("RPC: %4d call_start %s%d proc %d (%s)\n", task->tk_pid, | |
586 | clnt->cl_protname, clnt->cl_vers, task->tk_msg.rpc_proc->p_proc, | |
587 | (RPC_IS_ASYNC(task) ? "async" : "sync")); | |
588 | ||
589 | /* Increment call count */ | |
590 | task->tk_msg.rpc_proc->p_count++; | |
591 | clnt->cl_stats->rpccnt++; | |
592 | task->tk_action = call_reserve; | |
593 | } | |
594 | ||
595 | /* | |
596 | * 1. Reserve an RPC call slot | |
597 | */ | |
598 | static void | |
599 | call_reserve(struct rpc_task *task) | |
600 | { | |
601 | dprintk("RPC: %4d call_reserve\n", task->tk_pid); | |
602 | ||
603 | if (!rpcauth_uptodatecred(task)) { | |
604 | task->tk_action = call_refresh; | |
605 | return; | |
606 | } | |
607 | ||
608 | task->tk_status = 0; | |
609 | task->tk_action = call_reserveresult; | |
610 | xprt_reserve(task); | |
611 | } | |
612 | ||
613 | /* | |
614 | * 1b. Grok the result of xprt_reserve() | |
615 | */ | |
616 | static void | |
617 | call_reserveresult(struct rpc_task *task) | |
618 | { | |
619 | int status = task->tk_status; | |
620 | ||
621 | dprintk("RPC: %4d call_reserveresult (status %d)\n", | |
622 | task->tk_pid, task->tk_status); | |
623 | ||
624 | /* | |
625 | * After a call to xprt_reserve(), we must have either | |
626 | * a request slot or else an error status. | |
627 | */ | |
628 | task->tk_status = 0; | |
629 | if (status >= 0) { | |
630 | if (task->tk_rqstp) { | |
631 | task->tk_action = call_allocate; | |
632 | return; | |
633 | } | |
634 | ||
635 | printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n", | |
636 | __FUNCTION__, status); | |
637 | rpc_exit(task, -EIO); | |
638 | return; | |
639 | } | |
640 | ||
641 | /* | |
642 | * Even though there was an error, we may have acquired | |
643 | * a request slot somehow. Make sure not to leak it. | |
644 | */ | |
645 | if (task->tk_rqstp) { | |
646 | printk(KERN_ERR "%s: status=%d, request allocated anyway\n", | |
647 | __FUNCTION__, status); | |
648 | xprt_release(task); | |
649 | } | |
650 | ||
651 | switch (status) { | |
652 | case -EAGAIN: /* woken up; retry */ | |
653 | task->tk_action = call_reserve; | |
654 | return; | |
655 | case -EIO: /* probably a shutdown */ | |
656 | break; | |
657 | default: | |
658 | printk(KERN_ERR "%s: unrecognized error %d, exiting\n", | |
659 | __FUNCTION__, status); | |
660 | break; | |
661 | } | |
662 | rpc_exit(task, status); | |
663 | } | |
664 | ||
665 | /* | |
666 | * 2. Allocate the buffer. For details, see sched.c:rpc_malloc. | |
02107148 | 667 | * (Note: buffer memory is freed in xprt_release). |
1da177e4 LT |
668 | */ |
669 | static void | |
670 | call_allocate(struct rpc_task *task) | |
671 | { | |
02107148 CL |
672 | struct rpc_rqst *req = task->tk_rqstp; |
673 | struct rpc_xprt *xprt = task->tk_xprt; | |
1da177e4 LT |
674 | unsigned int bufsiz; |
675 | ||
676 | dprintk("RPC: %4d call_allocate (status %d)\n", | |
677 | task->tk_pid, task->tk_status); | |
678 | task->tk_action = call_bind; | |
02107148 | 679 | if (req->rq_buffer) |
1da177e4 LT |
680 | return; |
681 | ||
682 | /* FIXME: compute buffer requirements more exactly using | |
683 | * auth->au_wslack */ | |
684 | bufsiz = task->tk_msg.rpc_proc->p_bufsiz + RPC_SLACK_SPACE; | |
685 | ||
02107148 | 686 | if (xprt->ops->buf_alloc(task, bufsiz << 1) != NULL) |
1da177e4 LT |
687 | return; |
688 | printk(KERN_INFO "RPC: buffer allocation failed for task %p\n", task); | |
689 | ||
14b218a8 | 690 | if (RPC_IS_ASYNC(task) || !signalled()) { |
1da177e4 LT |
691 | xprt_release(task); |
692 | task->tk_action = call_reserve; | |
693 | rpc_delay(task, HZ>>4); | |
694 | return; | |
695 | } | |
696 | ||
697 | rpc_exit(task, -ERESTARTSYS); | |
698 | } | |
699 | ||
940e3318 TM |
700 | static inline int |
701 | rpc_task_need_encode(struct rpc_task *task) | |
702 | { | |
703 | return task->tk_rqstp->rq_snd_buf.len == 0; | |
704 | } | |
705 | ||
706 | static inline void | |
707 | rpc_task_force_reencode(struct rpc_task *task) | |
708 | { | |
709 | task->tk_rqstp->rq_snd_buf.len = 0; | |
710 | } | |
711 | ||
1da177e4 LT |
712 | /* |
713 | * 3. Encode arguments of an RPC call | |
714 | */ | |
715 | static void | |
716 | call_encode(struct rpc_task *task) | |
717 | { | |
1da177e4 LT |
718 | struct rpc_rqst *req = task->tk_rqstp; |
719 | struct xdr_buf *sndbuf = &req->rq_snd_buf; | |
720 | struct xdr_buf *rcvbuf = &req->rq_rcv_buf; | |
721 | unsigned int bufsiz; | |
722 | kxdrproc_t encode; | |
1da177e4 LT |
723 | u32 *p; |
724 | ||
725 | dprintk("RPC: %4d call_encode (status %d)\n", | |
726 | task->tk_pid, task->tk_status); | |
727 | ||
728 | /* Default buffer setup */ | |
02107148 CL |
729 | bufsiz = req->rq_bufsize >> 1; |
730 | sndbuf->head[0].iov_base = (void *)req->rq_buffer; | |
1da177e4 LT |
731 | sndbuf->head[0].iov_len = bufsiz; |
732 | sndbuf->tail[0].iov_len = 0; | |
733 | sndbuf->page_len = 0; | |
734 | sndbuf->len = 0; | |
735 | sndbuf->buflen = bufsiz; | |
02107148 | 736 | rcvbuf->head[0].iov_base = (void *)((char *)req->rq_buffer + bufsiz); |
1da177e4 LT |
737 | rcvbuf->head[0].iov_len = bufsiz; |
738 | rcvbuf->tail[0].iov_len = 0; | |
739 | rcvbuf->page_len = 0; | |
740 | rcvbuf->len = 0; | |
741 | rcvbuf->buflen = bufsiz; | |
742 | ||
743 | /* Encode header and provided arguments */ | |
744 | encode = task->tk_msg.rpc_proc->p_encode; | |
745 | if (!(p = call_header(task))) { | |
746 | printk(KERN_INFO "RPC: call_header failed, exit EIO\n"); | |
747 | rpc_exit(task, -EIO); | |
748 | return; | |
749 | } | |
f3680312 BF |
750 | if (encode == NULL) |
751 | return; | |
752 | ||
753 | task->tk_status = rpcauth_wrap_req(task, encode, req, p, | |
754 | task->tk_msg.rpc_argp); | |
755 | if (task->tk_status == -ENOMEM) { | |
756 | /* XXX: Is this sane? */ | |
757 | rpc_delay(task, 3*HZ); | |
758 | task->tk_status = -EAGAIN; | |
759 | } | |
1da177e4 LT |
760 | } |
761 | ||
762 | /* | |
763 | * 4. Get the server port number if not yet set | |
764 | */ | |
765 | static void | |
766 | call_bind(struct rpc_task *task) | |
767 | { | |
768 | struct rpc_clnt *clnt = task->tk_client; | |
1da177e4 | 769 | |
da351878 CL |
770 | dprintk("RPC: %4d call_bind (status %d)\n", |
771 | task->tk_pid, task->tk_status); | |
1da177e4 | 772 | |
da351878 | 773 | task->tk_action = call_connect; |
1da177e4 | 774 | if (!clnt->cl_port) { |
da351878 | 775 | task->tk_action = call_bind_status; |
03bf4b70 | 776 | task->tk_timeout = task->tk_xprt->bind_timeout; |
1da177e4 LT |
777 | rpc_getport(task, clnt); |
778 | } | |
779 | } | |
780 | ||
781 | /* | |
da351878 CL |
782 | * 4a. Sort out bind result |
783 | */ | |
784 | static void | |
785 | call_bind_status(struct rpc_task *task) | |
786 | { | |
787 | int status = -EACCES; | |
788 | ||
789 | if (task->tk_status >= 0) { | |
790 | dprintk("RPC: %4d call_bind_status (status %d)\n", | |
791 | task->tk_pid, task->tk_status); | |
792 | task->tk_status = 0; | |
793 | task->tk_action = call_connect; | |
794 | return; | |
795 | } | |
796 | ||
797 | switch (task->tk_status) { | |
798 | case -EACCES: | |
799 | dprintk("RPC: %4d remote rpcbind: RPC program/version unavailable\n", | |
800 | task->tk_pid); | |
ea635a51 CL |
801 | rpc_delay(task, 3*HZ); |
802 | goto retry_bind; | |
da351878 CL |
803 | case -ETIMEDOUT: |
804 | dprintk("RPC: %4d rpcbind request timed out\n", | |
805 | task->tk_pid); | |
806 | if (RPC_IS_SOFT(task)) { | |
807 | status = -EIO; | |
808 | break; | |
809 | } | |
810 | goto retry_bind; | |
811 | case -EPFNOSUPPORT: | |
812 | dprintk("RPC: %4d remote rpcbind service unavailable\n", | |
813 | task->tk_pid); | |
814 | break; | |
815 | case -EPROTONOSUPPORT: | |
816 | dprintk("RPC: %4d remote rpcbind version 2 unavailable\n", | |
817 | task->tk_pid); | |
818 | break; | |
819 | default: | |
820 | dprintk("RPC: %4d unrecognized rpcbind error (%d)\n", | |
821 | task->tk_pid, -task->tk_status); | |
822 | status = -EIO; | |
823 | break; | |
824 | } | |
825 | ||
826 | rpc_exit(task, status); | |
827 | return; | |
828 | ||
829 | retry_bind: | |
830 | task->tk_status = 0; | |
831 | task->tk_action = call_bind; | |
832 | return; | |
833 | } | |
834 | ||
835 | /* | |
836 | * 4b. Connect to the RPC server | |
1da177e4 LT |
837 | */ |
838 | static void | |
839 | call_connect(struct rpc_task *task) | |
840 | { | |
da351878 | 841 | struct rpc_xprt *xprt = task->tk_xprt; |
1da177e4 | 842 | |
da351878 CL |
843 | dprintk("RPC: %4d call_connect xprt %p %s connected\n", |
844 | task->tk_pid, xprt, | |
845 | (xprt_connected(xprt) ? "is" : "is not")); | |
1da177e4 | 846 | |
da351878 CL |
847 | task->tk_action = call_transmit; |
848 | if (!xprt_connected(xprt)) { | |
849 | task->tk_action = call_connect_status; | |
850 | if (task->tk_status < 0) | |
851 | return; | |
852 | xprt_connect(task); | |
1da177e4 | 853 | } |
1da177e4 LT |
854 | } |
855 | ||
856 | /* | |
da351878 | 857 | * 4c. Sort out connect result |
1da177e4 LT |
858 | */ |
859 | static void | |
860 | call_connect_status(struct rpc_task *task) | |
861 | { | |
862 | struct rpc_clnt *clnt = task->tk_client; | |
863 | int status = task->tk_status; | |
864 | ||
da351878 CL |
865 | dprintk("RPC: %5u call_connect_status (status %d)\n", |
866 | task->tk_pid, task->tk_status); | |
867 | ||
1da177e4 LT |
868 | task->tk_status = 0; |
869 | if (status >= 0) { | |
870 | clnt->cl_stats->netreconn++; | |
871 | task->tk_action = call_transmit; | |
872 | return; | |
873 | } | |
874 | ||
da351878 | 875 | /* Something failed: remote service port may have changed */ |
35f5a422 | 876 | rpc_force_rebind(clnt); |
da351878 | 877 | |
1da177e4 LT |
878 | switch (status) { |
879 | case -ENOTCONN: | |
880 | case -ETIMEDOUT: | |
881 | case -EAGAIN: | |
da351878 | 882 | task->tk_action = call_bind; |
1da177e4 LT |
883 | break; |
884 | default: | |
885 | rpc_exit(task, -EIO); | |
da351878 | 886 | break; |
1da177e4 LT |
887 | } |
888 | } | |
889 | ||
890 | /* | |
891 | * 5. Transmit the RPC request, and wait for reply | |
892 | */ | |
893 | static void | |
894 | call_transmit(struct rpc_task *task) | |
895 | { | |
896 | dprintk("RPC: %4d call_transmit (status %d)\n", | |
897 | task->tk_pid, task->tk_status); | |
898 | ||
899 | task->tk_action = call_status; | |
900 | if (task->tk_status < 0) | |
901 | return; | |
902 | task->tk_status = xprt_prepare_transmit(task); | |
903 | if (task->tk_status != 0) | |
904 | return; | |
905 | /* Encode here so that rpcsec_gss can use correct sequence number. */ | |
940e3318 TM |
906 | if (rpc_task_need_encode(task)) { |
907 | task->tk_rqstp->rq_bytes_sent = 0; | |
1da177e4 | 908 | call_encode(task); |
5e5ce5be TM |
909 | /* Did the encode result in an error condition? */ |
910 | if (task->tk_status != 0) | |
911 | goto out_nosend; | |
912 | } | |
940e3318 | 913 | task->tk_action = call_transmit_status; |
1da177e4 LT |
914 | xprt_transmit(task); |
915 | if (task->tk_status < 0) | |
916 | return; | |
917 | if (!task->tk_msg.rpc_proc->p_decode) { | |
abbcf28f | 918 | task->tk_action = rpc_exit_task; |
1da177e4 LT |
919 | rpc_wake_up_task(task); |
920 | } | |
5e5ce5be TM |
921 | return; |
922 | out_nosend: | |
923 | /* release socket write lock before attempting to handle error */ | |
924 | xprt_abort_transmit(task); | |
940e3318 | 925 | rpc_task_force_reencode(task); |
1da177e4 LT |
926 | } |
927 | ||
928 | /* | |
929 | * 6. Sort out the RPC call status | |
930 | */ | |
931 | static void | |
932 | call_status(struct rpc_task *task) | |
933 | { | |
934 | struct rpc_clnt *clnt = task->tk_client; | |
935 | struct rpc_rqst *req = task->tk_rqstp; | |
936 | int status; | |
937 | ||
938 | if (req->rq_received > 0 && !req->rq_bytes_sent) | |
939 | task->tk_status = req->rq_received; | |
940 | ||
941 | dprintk("RPC: %4d call_status (status %d)\n", | |
942 | task->tk_pid, task->tk_status); | |
943 | ||
944 | status = task->tk_status; | |
945 | if (status >= 0) { | |
946 | task->tk_action = call_decode; | |
947 | return; | |
948 | } | |
949 | ||
950 | task->tk_status = 0; | |
951 | switch(status) { | |
952 | case -ETIMEDOUT: | |
953 | task->tk_action = call_timeout; | |
954 | break; | |
955 | case -ECONNREFUSED: | |
956 | case -ENOTCONN: | |
35f5a422 | 957 | rpc_force_rebind(clnt); |
1da177e4 LT |
958 | task->tk_action = call_bind; |
959 | break; | |
960 | case -EAGAIN: | |
961 | task->tk_action = call_transmit; | |
962 | break; | |
963 | case -EIO: | |
964 | /* shutdown or soft timeout */ | |
965 | rpc_exit(task, status); | |
966 | break; | |
967 | default: | |
f518e35a | 968 | printk("%s: RPC call returned error %d\n", |
1da177e4 LT |
969 | clnt->cl_protname, -status); |
970 | rpc_exit(task, status); | |
971 | break; | |
972 | } | |
973 | } | |
974 | ||
975 | /* | |
940e3318 TM |
976 | * 6a. Handle transmission errors. |
977 | */ | |
978 | static void | |
979 | call_transmit_status(struct rpc_task *task) | |
980 | { | |
981 | if (task->tk_status != -EAGAIN) | |
982 | rpc_task_force_reencode(task); | |
983 | call_status(task); | |
984 | } | |
985 | ||
986 | /* | |
987 | * 6b. Handle RPC timeout | |
1da177e4 LT |
988 | * We do not release the request slot, so we keep using the |
989 | * same XID for all retransmits. | |
990 | */ | |
991 | static void | |
992 | call_timeout(struct rpc_task *task) | |
993 | { | |
994 | struct rpc_clnt *clnt = task->tk_client; | |
995 | ||
996 | if (xprt_adjust_timeout(task->tk_rqstp) == 0) { | |
997 | dprintk("RPC: %4d call_timeout (minor)\n", task->tk_pid); | |
998 | goto retry; | |
999 | } | |
1000 | ||
1001 | dprintk("RPC: %4d call_timeout (major)\n", task->tk_pid); | |
ef759a2e CL |
1002 | task->tk_timeouts++; |
1003 | ||
1da177e4 | 1004 | if (RPC_IS_SOFT(task)) { |
f518e35a | 1005 | printk(KERN_NOTICE "%s: server %s not responding, timed out\n", |
1da177e4 LT |
1006 | clnt->cl_protname, clnt->cl_server); |
1007 | rpc_exit(task, -EIO); | |
1008 | return; | |
1009 | } | |
1010 | ||
f518e35a | 1011 | if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) { |
1da177e4 LT |
1012 | task->tk_flags |= RPC_CALL_MAJORSEEN; |
1013 | printk(KERN_NOTICE "%s: server %s not responding, still trying\n", | |
1014 | clnt->cl_protname, clnt->cl_server); | |
1015 | } | |
35f5a422 | 1016 | rpc_force_rebind(clnt); |
1da177e4 LT |
1017 | |
1018 | retry: | |
1019 | clnt->cl_stats->rpcretrans++; | |
1020 | task->tk_action = call_bind; | |
1021 | task->tk_status = 0; | |
1022 | } | |
1023 | ||
1024 | /* | |
1025 | * 7. Decode the RPC reply | |
1026 | */ | |
1027 | static void | |
1028 | call_decode(struct rpc_task *task) | |
1029 | { | |
1030 | struct rpc_clnt *clnt = task->tk_client; | |
1031 | struct rpc_rqst *req = task->tk_rqstp; | |
1032 | kxdrproc_t decode = task->tk_msg.rpc_proc->p_decode; | |
1033 | u32 *p; | |
1034 | ||
1035 | dprintk("RPC: %4d call_decode (status %d)\n", | |
1036 | task->tk_pid, task->tk_status); | |
1037 | ||
f518e35a | 1038 | if (task->tk_flags & RPC_CALL_MAJORSEEN) { |
1da177e4 LT |
1039 | printk(KERN_NOTICE "%s: server %s OK\n", |
1040 | clnt->cl_protname, clnt->cl_server); | |
1041 | task->tk_flags &= ~RPC_CALL_MAJORSEEN; | |
1042 | } | |
1043 | ||
1044 | if (task->tk_status < 12) { | |
1045 | if (!RPC_IS_SOFT(task)) { | |
1046 | task->tk_action = call_bind; | |
1047 | clnt->cl_stats->rpcretrans++; | |
1048 | goto out_retry; | |
1049 | } | |
1050 | printk(KERN_WARNING "%s: too small RPC reply size (%d bytes)\n", | |
1051 | clnt->cl_protname, task->tk_status); | |
1052 | rpc_exit(task, -EIO); | |
1053 | return; | |
1054 | } | |
1055 | ||
1056 | req->rq_rcv_buf.len = req->rq_private_buf.len; | |
1057 | ||
1058 | /* Check that the softirq receive buffer is valid */ | |
1059 | WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf, | |
1060 | sizeof(req->rq_rcv_buf)) != 0); | |
1061 | ||
1062 | /* Verify the RPC header */ | |
abbcf28f TM |
1063 | p = call_verify(task); |
1064 | if (IS_ERR(p)) { | |
1065 | if (p == ERR_PTR(-EAGAIN)) | |
1066 | goto out_retry; | |
1067 | return; | |
1da177e4 LT |
1068 | } |
1069 | ||
abbcf28f | 1070 | task->tk_action = rpc_exit_task; |
1da177e4 LT |
1071 | |
1072 | if (decode) | |
1073 | task->tk_status = rpcauth_unwrap_resp(task, decode, req, p, | |
1074 | task->tk_msg.rpc_resp); | |
1075 | dprintk("RPC: %4d call_decode result %d\n", task->tk_pid, | |
1076 | task->tk_status); | |
1077 | return; | |
1078 | out_retry: | |
1079 | req->rq_received = req->rq_private_buf.len = 0; | |
1080 | task->tk_status = 0; | |
1081 | } | |
1082 | ||
1083 | /* | |
1084 | * 8. Refresh the credentials if rejected by the server | |
1085 | */ | |
1086 | static void | |
1087 | call_refresh(struct rpc_task *task) | |
1088 | { | |
1089 | dprintk("RPC: %4d call_refresh\n", task->tk_pid); | |
1090 | ||
1091 | xprt_release(task); /* Must do to obtain new XID */ | |
1092 | task->tk_action = call_refreshresult; | |
1093 | task->tk_status = 0; | |
1094 | task->tk_client->cl_stats->rpcauthrefresh++; | |
1095 | rpcauth_refreshcred(task); | |
1096 | } | |
1097 | ||
1098 | /* | |
1099 | * 8a. Process the results of a credential refresh | |
1100 | */ | |
1101 | static void | |
1102 | call_refreshresult(struct rpc_task *task) | |
1103 | { | |
1104 | int status = task->tk_status; | |
1105 | dprintk("RPC: %4d call_refreshresult (status %d)\n", | |
1106 | task->tk_pid, task->tk_status); | |
1107 | ||
1108 | task->tk_status = 0; | |
1109 | task->tk_action = call_reserve; | |
1110 | if (status >= 0 && rpcauth_uptodatecred(task)) | |
1111 | return; | |
1112 | if (status == -EACCES) { | |
1113 | rpc_exit(task, -EACCES); | |
1114 | return; | |
1115 | } | |
1116 | task->tk_action = call_refresh; | |
1117 | if (status != -ETIMEDOUT) | |
1118 | rpc_delay(task, 3*HZ); | |
1119 | return; | |
1120 | } | |
1121 | ||
1122 | /* | |
1123 | * Call header serialization | |
1124 | */ | |
1125 | static u32 * | |
1126 | call_header(struct rpc_task *task) | |
1127 | { | |
1128 | struct rpc_clnt *clnt = task->tk_client; | |
1da177e4 LT |
1129 | struct rpc_rqst *req = task->tk_rqstp; |
1130 | u32 *p = req->rq_svec[0].iov_base; | |
1131 | ||
1132 | /* FIXME: check buffer size? */ | |
808012fb CL |
1133 | |
1134 | p = xprt_skip_transport_header(task->tk_xprt, p); | |
1da177e4 LT |
1135 | *p++ = req->rq_xid; /* XID */ |
1136 | *p++ = htonl(RPC_CALL); /* CALL */ | |
1137 | *p++ = htonl(RPC_VERSION); /* RPC version */ | |
1138 | *p++ = htonl(clnt->cl_prog); /* program number */ | |
1139 | *p++ = htonl(clnt->cl_vers); /* program version */ | |
1140 | *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */ | |
334ccfd5 TM |
1141 | p = rpcauth_marshcred(task, p); |
1142 | req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p); | |
1143 | return p; | |
1da177e4 LT |
1144 | } |
1145 | ||
1146 | /* | |
1147 | * Reply header verification | |
1148 | */ | |
1149 | static u32 * | |
1150 | call_verify(struct rpc_task *task) | |
1151 | { | |
1152 | struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0]; | |
1153 | int len = task->tk_rqstp->rq_rcv_buf.len >> 2; | |
1154 | u32 *p = iov->iov_base, n; | |
1155 | int error = -EACCES; | |
1156 | ||
1157 | if ((len -= 3) < 0) | |
1158 | goto out_overflow; | |
1159 | p += 1; /* skip XID */ | |
1160 | ||
1161 | if ((n = ntohl(*p++)) != RPC_REPLY) { | |
1162 | printk(KERN_WARNING "call_verify: not an RPC reply: %x\n", n); | |
abbcf28f | 1163 | goto out_garbage; |
1da177e4 LT |
1164 | } |
1165 | if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) { | |
1166 | if (--len < 0) | |
1167 | goto out_overflow; | |
1168 | switch ((n = ntohl(*p++))) { | |
1169 | case RPC_AUTH_ERROR: | |
1170 | break; | |
1171 | case RPC_MISMATCH: | |
cdf47706 AG |
1172 | dprintk("%s: RPC call version mismatch!\n", __FUNCTION__); |
1173 | error = -EPROTONOSUPPORT; | |
1174 | goto out_err; | |
1da177e4 | 1175 | default: |
cdf47706 | 1176 | dprintk("%s: RPC call rejected, unknown error: %x\n", __FUNCTION__, n); |
1da177e4 LT |
1177 | goto out_eio; |
1178 | } | |
1179 | if (--len < 0) | |
1180 | goto out_overflow; | |
1181 | switch ((n = ntohl(*p++))) { | |
1182 | case RPC_AUTH_REJECTEDCRED: | |
1183 | case RPC_AUTH_REJECTEDVERF: | |
1184 | case RPCSEC_GSS_CREDPROBLEM: | |
1185 | case RPCSEC_GSS_CTXPROBLEM: | |
1186 | if (!task->tk_cred_retry) | |
1187 | break; | |
1188 | task->tk_cred_retry--; | |
1189 | dprintk("RPC: %4d call_verify: retry stale creds\n", | |
1190 | task->tk_pid); | |
1191 | rpcauth_invalcred(task); | |
1192 | task->tk_action = call_refresh; | |
abbcf28f | 1193 | goto out_retry; |
1da177e4 LT |
1194 | case RPC_AUTH_BADCRED: |
1195 | case RPC_AUTH_BADVERF: | |
1196 | /* possibly garbled cred/verf? */ | |
1197 | if (!task->tk_garb_retry) | |
1198 | break; | |
1199 | task->tk_garb_retry--; | |
1200 | dprintk("RPC: %4d call_verify: retry garbled creds\n", | |
1201 | task->tk_pid); | |
1202 | task->tk_action = call_bind; | |
abbcf28f | 1203 | goto out_retry; |
1da177e4 | 1204 | case RPC_AUTH_TOOWEAK: |
1356b8c2 LS |
1205 | printk(KERN_NOTICE "call_verify: server %s requires stronger " |
1206 | "authentication.\n", task->tk_client->cl_server); | |
1da177e4 LT |
1207 | break; |
1208 | default: | |
1209 | printk(KERN_WARNING "call_verify: unknown auth error: %x\n", n); | |
1210 | error = -EIO; | |
1211 | } | |
1212 | dprintk("RPC: %4d call_verify: call rejected %d\n", | |
1213 | task->tk_pid, n); | |
1214 | goto out_err; | |
1215 | } | |
1216 | if (!(p = rpcauth_checkverf(task, p))) { | |
1217 | printk(KERN_WARNING "call_verify: auth check failed\n"); | |
abbcf28f | 1218 | goto out_garbage; /* bad verifier, retry */ |
1da177e4 LT |
1219 | } |
1220 | len = p - (u32 *)iov->iov_base - 1; | |
1221 | if (len < 0) | |
1222 | goto out_overflow; | |
1223 | switch ((n = ntohl(*p++))) { | |
1224 | case RPC_SUCCESS: | |
1225 | return p; | |
1226 | case RPC_PROG_UNAVAIL: | |
cdf47706 | 1227 | dprintk("RPC: call_verify: program %u is unsupported by server %s\n", |
1da177e4 LT |
1228 | (unsigned int)task->tk_client->cl_prog, |
1229 | task->tk_client->cl_server); | |
cdf47706 AG |
1230 | error = -EPFNOSUPPORT; |
1231 | goto out_err; | |
1da177e4 | 1232 | case RPC_PROG_MISMATCH: |
cdf47706 | 1233 | dprintk("RPC: call_verify: program %u, version %u unsupported by server %s\n", |
1da177e4 LT |
1234 | (unsigned int)task->tk_client->cl_prog, |
1235 | (unsigned int)task->tk_client->cl_vers, | |
1236 | task->tk_client->cl_server); | |
cdf47706 AG |
1237 | error = -EPROTONOSUPPORT; |
1238 | goto out_err; | |
1da177e4 | 1239 | case RPC_PROC_UNAVAIL: |
cdf47706 | 1240 | dprintk("RPC: call_verify: proc %p unsupported by program %u, version %u on server %s\n", |
1da177e4 LT |
1241 | task->tk_msg.rpc_proc, |
1242 | task->tk_client->cl_prog, | |
1243 | task->tk_client->cl_vers, | |
1244 | task->tk_client->cl_server); | |
cdf47706 AG |
1245 | error = -EOPNOTSUPP; |
1246 | goto out_err; | |
1da177e4 LT |
1247 | case RPC_GARBAGE_ARGS: |
1248 | dprintk("RPC: %4d %s: server saw garbage\n", task->tk_pid, __FUNCTION__); | |
1249 | break; /* retry */ | |
1250 | default: | |
1251 | printk(KERN_WARNING "call_verify: server accept status: %x\n", n); | |
1252 | /* Also retry */ | |
1253 | } | |
1254 | ||
abbcf28f | 1255 | out_garbage: |
1da177e4 LT |
1256 | task->tk_client->cl_stats->rpcgarbage++; |
1257 | if (task->tk_garb_retry) { | |
1258 | task->tk_garb_retry--; | |
cdf47706 | 1259 | dprintk("RPC %s: retrying %4d\n", __FUNCTION__, task->tk_pid); |
1da177e4 | 1260 | task->tk_action = call_bind; |
abbcf28f TM |
1261 | out_retry: |
1262 | return ERR_PTR(-EAGAIN); | |
1da177e4 LT |
1263 | } |
1264 | printk(KERN_WARNING "RPC %s: retry failed, exit EIO\n", __FUNCTION__); | |
1265 | out_eio: | |
1266 | error = -EIO; | |
1267 | out_err: | |
1268 | rpc_exit(task, error); | |
abbcf28f | 1269 | return ERR_PTR(error); |
1da177e4 LT |
1270 | out_overflow: |
1271 | printk(KERN_WARNING "RPC %s: server reply was truncated.\n", __FUNCTION__); | |
abbcf28f | 1272 | goto out_garbage; |
1da177e4 | 1273 | } |
5ee0ed7d TM |
1274 | |
1275 | static int rpcproc_encode_null(void *rqstp, u32 *data, void *obj) | |
1276 | { | |
1277 | return 0; | |
1278 | } | |
1279 | ||
1280 | static int rpcproc_decode_null(void *rqstp, u32 *data, void *obj) | |
1281 | { | |
1282 | return 0; | |
1283 | } | |
1284 | ||
1285 | static struct rpc_procinfo rpcproc_null = { | |
1286 | .p_encode = rpcproc_encode_null, | |
1287 | .p_decode = rpcproc_decode_null, | |
1288 | }; | |
1289 | ||
1290 | int rpc_ping(struct rpc_clnt *clnt, int flags) | |
1291 | { | |
1292 | struct rpc_message msg = { | |
1293 | .rpc_proc = &rpcproc_null, | |
1294 | }; | |
1295 | int err; | |
1296 | msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0); | |
1297 | err = rpc_call_sync(clnt, &msg, flags); | |
1298 | put_rpccred(msg.rpc_cred); | |
1299 | return err; | |
1300 | } |