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 | ||
54281548 TM |
73 | clnt->cl_vfsmnt = ERR_PTR(-ENOENT); |
74 | clnt->cl_dentry = ERR_PTR(-ENOENT); | |
1da177e4 LT |
75 | if (dir_name == NULL) |
76 | return 0; | |
54281548 TM |
77 | |
78 | clnt->cl_vfsmnt = rpc_get_mount(); | |
79 | if (IS_ERR(clnt->cl_vfsmnt)) | |
80 | return PTR_ERR(clnt->cl_vfsmnt); | |
81 | ||
f134585a TM |
82 | for (;;) { |
83 | snprintf(clnt->cl_pathname, sizeof(clnt->cl_pathname), | |
84 | "%s/clnt%x", dir_name, | |
85 | (unsigned int)clntid++); | |
86 | clnt->cl_pathname[sizeof(clnt->cl_pathname) - 1] = '\0'; | |
87 | clnt->cl_dentry = rpc_mkdir(clnt->cl_pathname, clnt); | |
88 | if (!IS_ERR(clnt->cl_dentry)) | |
89 | return 0; | |
1da177e4 | 90 | error = PTR_ERR(clnt->cl_dentry); |
f134585a TM |
91 | if (error != -EEXIST) { |
92 | printk(KERN_INFO "RPC: Couldn't create pipefs entry %s, error %d\n", | |
93 | clnt->cl_pathname, error); | |
54281548 | 94 | rpc_put_mount(); |
f134585a TM |
95 | return error; |
96 | } | |
1da177e4 LT |
97 | } |
98 | } | |
99 | ||
100 | /* | |
101 | * Create an RPC client | |
102 | * FIXME: This should also take a flags argument (as in task->tk_flags). | |
103 | * It's called (among others) from pmap_create_client, which may in | |
104 | * turn be called by an async task. In this case, rpciod should not be | |
105 | * made to sleep too long. | |
106 | */ | |
107 | struct rpc_clnt * | |
5ee0ed7d | 108 | rpc_new_client(struct rpc_xprt *xprt, char *servname, |
1da177e4 LT |
109 | struct rpc_program *program, u32 vers, |
110 | rpc_authflavor_t flavor) | |
111 | { | |
112 | struct rpc_version *version; | |
113 | struct rpc_clnt *clnt = NULL; | |
6a19275a | 114 | struct rpc_auth *auth; |
1da177e4 LT |
115 | int err; |
116 | int len; | |
117 | ||
118 | dprintk("RPC: creating %s client for %s (xprt %p)\n", | |
119 | program->name, servname, xprt); | |
120 | ||
121 | err = -EINVAL; | |
122 | if (!xprt) | |
712917d1 | 123 | goto out_no_xprt; |
1da177e4 LT |
124 | if (vers >= program->nrvers || !(version = program->version[vers])) |
125 | goto out_err; | |
126 | ||
127 | err = -ENOMEM; | |
8b3a7005 | 128 | clnt = kmalloc(sizeof(*clnt), GFP_KERNEL); |
1da177e4 LT |
129 | if (!clnt) |
130 | goto out_err; | |
131 | memset(clnt, 0, sizeof(*clnt)); | |
132 | atomic_set(&clnt->cl_users, 0); | |
133 | atomic_set(&clnt->cl_count, 1); | |
134 | clnt->cl_parent = clnt; | |
135 | ||
136 | clnt->cl_server = clnt->cl_inline_name; | |
137 | len = strlen(servname) + 1; | |
138 | if (len > sizeof(clnt->cl_inline_name)) { | |
139 | char *buf = kmalloc(len, GFP_KERNEL); | |
140 | if (buf != 0) | |
141 | clnt->cl_server = buf; | |
142 | else | |
143 | len = sizeof(clnt->cl_inline_name); | |
144 | } | |
145 | strlcpy(clnt->cl_server, servname, len); | |
146 | ||
147 | clnt->cl_xprt = xprt; | |
148 | clnt->cl_procinfo = version->procs; | |
149 | clnt->cl_maxproc = version->nrprocs; | |
150 | clnt->cl_protname = program->name; | |
151 | clnt->cl_pmap = &clnt->cl_pmap_default; | |
152 | clnt->cl_port = xprt->addr.sin_port; | |
153 | clnt->cl_prog = program->number; | |
154 | clnt->cl_vers = version->number; | |
155 | clnt->cl_prot = xprt->prot; | |
156 | clnt->cl_stats = program->stats; | |
11c556b3 | 157 | clnt->cl_metrics = rpc_alloc_iostats(clnt); |
1da177e4 LT |
158 | rpc_init_wait_queue(&clnt->cl_pmap_default.pm_bindwait, "bindwait"); |
159 | ||
160 | if (!clnt->cl_port) | |
161 | clnt->cl_autobind = 1; | |
162 | ||
163 | clnt->cl_rtt = &clnt->cl_rtt_default; | |
164 | rpc_init_rtt(&clnt->cl_rtt_default, xprt->timeout.to_initval); | |
165 | ||
166 | err = rpc_setup_pipedir(clnt, program->pipe_dir_name); | |
167 | if (err < 0) | |
168 | goto out_no_path; | |
169 | ||
6a19275a BF |
170 | auth = rpcauth_create(flavor, clnt); |
171 | if (IS_ERR(auth)) { | |
1da177e4 LT |
172 | printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n", |
173 | flavor); | |
6a19275a | 174 | err = PTR_ERR(auth); |
1da177e4 LT |
175 | goto out_no_auth; |
176 | } | |
177 | ||
178 | /* save the nodename */ | |
179 | clnt->cl_nodelen = strlen(system_utsname.nodename); | |
180 | if (clnt->cl_nodelen > UNX_MAXNODENAME) | |
181 | clnt->cl_nodelen = UNX_MAXNODENAME; | |
182 | memcpy(clnt->cl_nodename, system_utsname.nodename, clnt->cl_nodelen); | |
183 | return clnt; | |
184 | ||
185 | out_no_auth: | |
54281548 TM |
186 | if (!IS_ERR(clnt->cl_dentry)) { |
187 | rpc_rmdir(clnt->cl_pathname); | |
188 | dput(clnt->cl_dentry); | |
189 | rpc_put_mount(); | |
190 | } | |
1da177e4 LT |
191 | out_no_path: |
192 | if (clnt->cl_server != clnt->cl_inline_name) | |
193 | kfree(clnt->cl_server); | |
194 | kfree(clnt); | |
195 | out_err: | |
5b616f5d | 196 | xprt_destroy(xprt); |
712917d1 | 197 | out_no_xprt: |
1da177e4 LT |
198 | return ERR_PTR(err); |
199 | } | |
200 | ||
5ee0ed7d TM |
201 | /** |
202 | * Create an RPC client | |
203 | * @xprt - pointer to xprt struct | |
204 | * @servname - name of server | |
205 | * @info - rpc_program | |
206 | * @version - rpc_program version | |
207 | * @authflavor - rpc_auth flavour to use | |
208 | * | |
209 | * Creates an RPC client structure, then pings the server in order to | |
210 | * determine if it is up, and if it supports this program and version. | |
211 | * | |
212 | * This function should never be called by asynchronous tasks such as | |
213 | * the portmapper. | |
214 | */ | |
215 | struct rpc_clnt *rpc_create_client(struct rpc_xprt *xprt, char *servname, | |
216 | struct rpc_program *info, u32 version, rpc_authflavor_t authflavor) | |
217 | { | |
218 | struct rpc_clnt *clnt; | |
219 | int err; | |
220 | ||
221 | clnt = rpc_new_client(xprt, servname, info, version, authflavor); | |
222 | if (IS_ERR(clnt)) | |
223 | return clnt; | |
224 | err = rpc_ping(clnt, RPC_TASK_SOFT|RPC_TASK_NOINTR); | |
225 | if (err == 0) | |
226 | return clnt; | |
227 | rpc_shutdown_client(clnt); | |
228 | return ERR_PTR(err); | |
229 | } | |
230 | ||
1da177e4 LT |
231 | /* |
232 | * This function clones the RPC client structure. It allows us to share the | |
233 | * same transport while varying parameters such as the authentication | |
234 | * flavour. | |
235 | */ | |
236 | struct rpc_clnt * | |
237 | rpc_clone_client(struct rpc_clnt *clnt) | |
238 | { | |
239 | struct rpc_clnt *new; | |
240 | ||
8b3a7005 | 241 | new = kmalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
242 | if (!new) |
243 | goto out_no_clnt; | |
244 | memcpy(new, clnt, sizeof(*new)); | |
245 | atomic_set(&new->cl_count, 1); | |
246 | atomic_set(&new->cl_users, 0); | |
247 | new->cl_parent = clnt; | |
248 | atomic_inc(&clnt->cl_count); | |
249 | /* Duplicate portmapper */ | |
250 | rpc_init_wait_queue(&new->cl_pmap_default.pm_bindwait, "bindwait"); | |
251 | /* Turn off autobind on clones */ | |
252 | new->cl_autobind = 0; | |
253 | new->cl_oneshot = 0; | |
254 | new->cl_dead = 0; | |
54281548 TM |
255 | if (!IS_ERR(new->cl_dentry)) { |
256 | dget(new->cl_dentry); | |
257 | rpc_get_mount(); | |
258 | } | |
1da177e4 LT |
259 | rpc_init_rtt(&new->cl_rtt_default, clnt->cl_xprt->timeout.to_initval); |
260 | if (new->cl_auth) | |
261 | atomic_inc(&new->cl_auth->au_count); | |
007e251f | 262 | new->cl_pmap = &new->cl_pmap_default; |
11c556b3 | 263 | new->cl_metrics = rpc_alloc_iostats(clnt); |
1da177e4 LT |
264 | return new; |
265 | out_no_clnt: | |
266 | printk(KERN_INFO "RPC: out of memory in %s\n", __FUNCTION__); | |
267 | return ERR_PTR(-ENOMEM); | |
268 | } | |
269 | ||
270 | /* | |
271 | * Properly shut down an RPC client, terminating all outstanding | |
272 | * requests. Note that we must be certain that cl_oneshot and | |
273 | * cl_dead are cleared, or else the client would be destroyed | |
274 | * when the last task releases it. | |
275 | */ | |
276 | int | |
277 | rpc_shutdown_client(struct rpc_clnt *clnt) | |
278 | { | |
279 | dprintk("RPC: shutting down %s client for %s, tasks=%d\n", | |
280 | clnt->cl_protname, clnt->cl_server, | |
281 | atomic_read(&clnt->cl_users)); | |
282 | ||
283 | while (atomic_read(&clnt->cl_users) > 0) { | |
284 | /* Don't let rpc_release_client destroy us */ | |
285 | clnt->cl_oneshot = 0; | |
286 | clnt->cl_dead = 0; | |
287 | rpc_killall_tasks(clnt); | |
532347e2 | 288 | wait_event_timeout(destroy_wait, |
4f47707b | 289 | !atomic_read(&clnt->cl_users), 1*HZ); |
1da177e4 LT |
290 | } |
291 | ||
292 | if (atomic_read(&clnt->cl_users) < 0) { | |
293 | printk(KERN_ERR "RPC: rpc_shutdown_client clnt %p tasks=%d\n", | |
294 | clnt, atomic_read(&clnt->cl_users)); | |
295 | #ifdef RPC_DEBUG | |
296 | rpc_show_tasks(); | |
297 | #endif | |
298 | BUG(); | |
299 | } | |
300 | ||
301 | return rpc_destroy_client(clnt); | |
302 | } | |
303 | ||
304 | /* | |
305 | * Delete an RPC client | |
306 | */ | |
307 | int | |
308 | rpc_destroy_client(struct rpc_clnt *clnt) | |
309 | { | |
310 | if (!atomic_dec_and_test(&clnt->cl_count)) | |
311 | return 1; | |
312 | BUG_ON(atomic_read(&clnt->cl_users) != 0); | |
313 | ||
314 | dprintk("RPC: destroying %s client for %s\n", | |
315 | clnt->cl_protname, clnt->cl_server); | |
316 | if (clnt->cl_auth) { | |
317 | rpcauth_destroy(clnt->cl_auth); | |
318 | clnt->cl_auth = NULL; | |
319 | } | |
320 | if (clnt->cl_parent != clnt) { | |
321 | rpc_destroy_client(clnt->cl_parent); | |
322 | goto out_free; | |
323 | } | |
f134585a TM |
324 | if (clnt->cl_pathname[0]) |
325 | rpc_rmdir(clnt->cl_pathname); | |
1da177e4 LT |
326 | if (clnt->cl_xprt) { |
327 | xprt_destroy(clnt->cl_xprt); | |
328 | clnt->cl_xprt = NULL; | |
329 | } | |
330 | if (clnt->cl_server != clnt->cl_inline_name) | |
331 | kfree(clnt->cl_server); | |
332 | out_free: | |
11c556b3 CL |
333 | rpc_free_iostats(clnt->cl_metrics); |
334 | clnt->cl_metrics = NULL; | |
54281548 | 335 | if (!IS_ERR(clnt->cl_dentry)) { |
12de3b35 | 336 | dput(clnt->cl_dentry); |
54281548 TM |
337 | rpc_put_mount(); |
338 | } | |
1da177e4 LT |
339 | kfree(clnt); |
340 | return 0; | |
341 | } | |
342 | ||
343 | /* | |
344 | * Release an RPC client | |
345 | */ | |
346 | void | |
347 | rpc_release_client(struct rpc_clnt *clnt) | |
348 | { | |
349 | dprintk("RPC: rpc_release_client(%p, %d)\n", | |
350 | clnt, atomic_read(&clnt->cl_users)); | |
351 | ||
352 | if (!atomic_dec_and_test(&clnt->cl_users)) | |
353 | return; | |
354 | wake_up(&destroy_wait); | |
355 | if (clnt->cl_oneshot || clnt->cl_dead) | |
356 | rpc_destroy_client(clnt); | |
357 | } | |
358 | ||
007e251f AG |
359 | /** |
360 | * rpc_bind_new_program - bind a new RPC program to an existing client | |
361 | * @old - old rpc_client | |
362 | * @program - rpc program to set | |
363 | * @vers - rpc program version | |
364 | * | |
365 | * Clones the rpc client and sets up a new RPC program. This is mainly | |
366 | * of use for enabling different RPC programs to share the same transport. | |
367 | * The Sun NFSv2/v3 ACL protocol can do this. | |
368 | */ | |
369 | struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old, | |
370 | struct rpc_program *program, | |
371 | int vers) | |
372 | { | |
373 | struct rpc_clnt *clnt; | |
374 | struct rpc_version *version; | |
375 | int err; | |
376 | ||
377 | BUG_ON(vers >= program->nrvers || !program->version[vers]); | |
378 | version = program->version[vers]; | |
379 | clnt = rpc_clone_client(old); | |
380 | if (IS_ERR(clnt)) | |
381 | goto out; | |
382 | clnt->cl_procinfo = version->procs; | |
383 | clnt->cl_maxproc = version->nrprocs; | |
384 | clnt->cl_protname = program->name; | |
385 | clnt->cl_prog = program->number; | |
386 | clnt->cl_vers = version->number; | |
387 | clnt->cl_stats = program->stats; | |
388 | err = rpc_ping(clnt, RPC_TASK_SOFT|RPC_TASK_NOINTR); | |
389 | if (err != 0) { | |
390 | rpc_shutdown_client(clnt); | |
391 | clnt = ERR_PTR(err); | |
392 | } | |
393 | out: | |
394 | return clnt; | |
395 | } | |
396 | ||
1da177e4 LT |
397 | /* |
398 | * Default callback for async RPC calls | |
399 | */ | |
400 | static void | |
963d8fe5 | 401 | rpc_default_callback(struct rpc_task *task, void *data) |
1da177e4 LT |
402 | { |
403 | } | |
404 | ||
963d8fe5 TM |
405 | static const struct rpc_call_ops rpc_default_ops = { |
406 | .rpc_call_done = rpc_default_callback, | |
407 | }; | |
408 | ||
1da177e4 | 409 | /* |
14b218a8 | 410 | * Export the signal mask handling for synchronous code that |
1da177e4 LT |
411 | * sleeps on RPC calls |
412 | */ | |
2bd61579 | 413 | #define RPC_INTR_SIGNALS (sigmask(SIGHUP) | sigmask(SIGINT) | sigmask(SIGQUIT) | sigmask(SIGTERM)) |
1da177e4 | 414 | |
14b218a8 TM |
415 | static void rpc_save_sigmask(sigset_t *oldset, int intr) |
416 | { | |
2bd61579 | 417 | unsigned long sigallow = sigmask(SIGKILL); |
14b218a8 TM |
418 | sigset_t sigmask; |
419 | ||
420 | /* Block all signals except those listed in sigallow */ | |
421 | if (intr) | |
422 | sigallow |= RPC_INTR_SIGNALS; | |
423 | siginitsetinv(&sigmask, sigallow); | |
424 | sigprocmask(SIG_BLOCK, &sigmask, oldset); | |
425 | } | |
426 | ||
427 | static inline void rpc_task_sigmask(struct rpc_task *task, sigset_t *oldset) | |
428 | { | |
429 | rpc_save_sigmask(oldset, !RPC_TASK_UNINTERRUPTIBLE(task)); | |
430 | } | |
431 | ||
432 | static inline void rpc_restore_sigmask(sigset_t *oldset) | |
433 | { | |
434 | sigprocmask(SIG_SETMASK, oldset, NULL); | |
435 | } | |
436 | ||
1da177e4 LT |
437 | void rpc_clnt_sigmask(struct rpc_clnt *clnt, sigset_t *oldset) |
438 | { | |
14b218a8 | 439 | rpc_save_sigmask(oldset, clnt->cl_intr); |
1da177e4 LT |
440 | } |
441 | ||
442 | void rpc_clnt_sigunmask(struct rpc_clnt *clnt, sigset_t *oldset) | |
443 | { | |
14b218a8 | 444 | rpc_restore_sigmask(oldset); |
1da177e4 LT |
445 | } |
446 | ||
447 | /* | |
448 | * New rpc_call implementation | |
449 | */ | |
450 | int rpc_call_sync(struct rpc_clnt *clnt, struct rpc_message *msg, int flags) | |
451 | { | |
452 | struct rpc_task *task; | |
453 | sigset_t oldset; | |
454 | int status; | |
455 | ||
456 | /* If this client is slain all further I/O fails */ | |
457 | if (clnt->cl_dead) | |
458 | return -EIO; | |
459 | ||
460 | BUG_ON(flags & RPC_TASK_ASYNC); | |
461 | ||
1da177e4 | 462 | status = -ENOMEM; |
963d8fe5 | 463 | task = rpc_new_task(clnt, flags, &rpc_default_ops, NULL); |
1da177e4 LT |
464 | if (task == NULL) |
465 | goto out; | |
466 | ||
14b218a8 TM |
467 | /* Mask signals on RPC calls _and_ GSS_AUTH upcalls */ |
468 | rpc_task_sigmask(task, &oldset); | |
469 | ||
1da177e4 LT |
470 | rpc_call_setup(task, msg, 0); |
471 | ||
472 | /* Set up the call info struct and execute the task */ | |
e60859ac TM |
473 | status = task->tk_status; |
474 | if (status == 0) { | |
475 | atomic_inc(&task->tk_count); | |
1da177e4 | 476 | status = rpc_execute(task); |
e60859ac TM |
477 | if (status == 0) |
478 | status = task->tk_status; | |
1da177e4 | 479 | } |
14b218a8 | 480 | rpc_restore_sigmask(&oldset); |
e60859ac | 481 | rpc_release_task(task); |
1da177e4 | 482 | out: |
1da177e4 LT |
483 | return status; |
484 | } | |
485 | ||
486 | /* | |
487 | * New rpc_call implementation | |
488 | */ | |
489 | int | |
490 | rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, int flags, | |
963d8fe5 | 491 | const struct rpc_call_ops *tk_ops, void *data) |
1da177e4 LT |
492 | { |
493 | struct rpc_task *task; | |
494 | sigset_t oldset; | |
495 | int status; | |
496 | ||
497 | /* If this client is slain all further I/O fails */ | |
7a1218a2 | 498 | status = -EIO; |
1da177e4 | 499 | if (clnt->cl_dead) |
7a1218a2 | 500 | goto out_release; |
1da177e4 LT |
501 | |
502 | flags |= RPC_TASK_ASYNC; | |
503 | ||
1da177e4 | 504 | /* Create/initialize a new RPC task */ |
1da177e4 | 505 | status = -ENOMEM; |
963d8fe5 | 506 | if (!(task = rpc_new_task(clnt, flags, tk_ops, data))) |
7a1218a2 | 507 | goto out_release; |
1da177e4 | 508 | |
14b218a8 TM |
509 | /* Mask signals on GSS_AUTH upcalls */ |
510 | rpc_task_sigmask(task, &oldset); | |
511 | ||
1da177e4 LT |
512 | rpc_call_setup(task, msg, 0); |
513 | ||
514 | /* Set up the call info struct and execute the task */ | |
515 | status = task->tk_status; | |
516 | if (status == 0) | |
517 | rpc_execute(task); | |
518 | else | |
519 | rpc_release_task(task); | |
520 | ||
14b218a8 | 521 | rpc_restore_sigmask(&oldset); |
7a1218a2 TM |
522 | return status; |
523 | out_release: | |
524 | if (tk_ops->rpc_release != NULL) | |
525 | tk_ops->rpc_release(data); | |
1da177e4 LT |
526 | return status; |
527 | } | |
528 | ||
529 | ||
530 | void | |
531 | rpc_call_setup(struct rpc_task *task, struct rpc_message *msg, int flags) | |
532 | { | |
533 | task->tk_msg = *msg; | |
534 | task->tk_flags |= flags; | |
535 | /* Bind the user cred */ | |
536 | if (task->tk_msg.rpc_cred != NULL) | |
537 | rpcauth_holdcred(task); | |
538 | else | |
539 | rpcauth_bindcred(task); | |
540 | ||
541 | if (task->tk_status == 0) | |
542 | task->tk_action = call_start; | |
543 | else | |
abbcf28f | 544 | task->tk_action = rpc_exit_task; |
1da177e4 LT |
545 | } |
546 | ||
547 | void | |
548 | rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize) | |
549 | { | |
550 | struct rpc_xprt *xprt = clnt->cl_xprt; | |
470056c2 CL |
551 | if (xprt->ops->set_buffer_size) |
552 | xprt->ops->set_buffer_size(xprt, sndsize, rcvsize); | |
1da177e4 LT |
553 | } |
554 | ||
555 | /* | |
556 | * Return size of largest payload RPC client can support, in bytes | |
557 | * | |
558 | * For stream transports, this is one RPC record fragment (see RFC | |
559 | * 1831), as we don't support multi-record requests yet. For datagram | |
560 | * transports, this is the size of an IP packet minus the IP, UDP, and | |
561 | * RPC header sizes. | |
562 | */ | |
563 | size_t rpc_max_payload(struct rpc_clnt *clnt) | |
564 | { | |
565 | return clnt->cl_xprt->max_payload; | |
566 | } | |
567 | EXPORT_SYMBOL(rpc_max_payload); | |
568 | ||
35f5a422 CL |
569 | /** |
570 | * rpc_force_rebind - force transport to check that remote port is unchanged | |
571 | * @clnt: client to rebind | |
572 | * | |
573 | */ | |
574 | void rpc_force_rebind(struct rpc_clnt *clnt) | |
575 | { | |
576 | if (clnt->cl_autobind) | |
577 | clnt->cl_port = 0; | |
578 | } | |
579 | EXPORT_SYMBOL(rpc_force_rebind); | |
580 | ||
1da177e4 LT |
581 | /* |
582 | * Restart an (async) RPC call. Usually called from within the | |
583 | * exit handler. | |
584 | */ | |
585 | void | |
586 | rpc_restart_call(struct rpc_task *task) | |
587 | { | |
588 | if (RPC_ASSASSINATED(task)) | |
589 | return; | |
590 | ||
591 | task->tk_action = call_start; | |
592 | } | |
593 | ||
594 | /* | |
595 | * 0. Initial state | |
596 | * | |
597 | * Other FSM states can be visited zero or more times, but | |
598 | * this state is visited exactly once for each RPC. | |
599 | */ | |
600 | static void | |
601 | call_start(struct rpc_task *task) | |
602 | { | |
603 | struct rpc_clnt *clnt = task->tk_client; | |
604 | ||
605 | dprintk("RPC: %4d call_start %s%d proc %d (%s)\n", task->tk_pid, | |
606 | clnt->cl_protname, clnt->cl_vers, task->tk_msg.rpc_proc->p_proc, | |
607 | (RPC_IS_ASYNC(task) ? "async" : "sync")); | |
608 | ||
609 | /* Increment call count */ | |
610 | task->tk_msg.rpc_proc->p_count++; | |
611 | clnt->cl_stats->rpccnt++; | |
612 | task->tk_action = call_reserve; | |
613 | } | |
614 | ||
615 | /* | |
616 | * 1. Reserve an RPC call slot | |
617 | */ | |
618 | static void | |
619 | call_reserve(struct rpc_task *task) | |
620 | { | |
621 | dprintk("RPC: %4d call_reserve\n", task->tk_pid); | |
622 | ||
623 | if (!rpcauth_uptodatecred(task)) { | |
624 | task->tk_action = call_refresh; | |
625 | return; | |
626 | } | |
627 | ||
628 | task->tk_status = 0; | |
629 | task->tk_action = call_reserveresult; | |
630 | xprt_reserve(task); | |
631 | } | |
632 | ||
633 | /* | |
634 | * 1b. Grok the result of xprt_reserve() | |
635 | */ | |
636 | static void | |
637 | call_reserveresult(struct rpc_task *task) | |
638 | { | |
639 | int status = task->tk_status; | |
640 | ||
641 | dprintk("RPC: %4d call_reserveresult (status %d)\n", | |
642 | task->tk_pid, task->tk_status); | |
643 | ||
644 | /* | |
645 | * After a call to xprt_reserve(), we must have either | |
646 | * a request slot or else an error status. | |
647 | */ | |
648 | task->tk_status = 0; | |
649 | if (status >= 0) { | |
650 | if (task->tk_rqstp) { | |
651 | task->tk_action = call_allocate; | |
652 | return; | |
653 | } | |
654 | ||
655 | printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n", | |
656 | __FUNCTION__, status); | |
657 | rpc_exit(task, -EIO); | |
658 | return; | |
659 | } | |
660 | ||
661 | /* | |
662 | * Even though there was an error, we may have acquired | |
663 | * a request slot somehow. Make sure not to leak it. | |
664 | */ | |
665 | if (task->tk_rqstp) { | |
666 | printk(KERN_ERR "%s: status=%d, request allocated anyway\n", | |
667 | __FUNCTION__, status); | |
668 | xprt_release(task); | |
669 | } | |
670 | ||
671 | switch (status) { | |
672 | case -EAGAIN: /* woken up; retry */ | |
673 | task->tk_action = call_reserve; | |
674 | return; | |
675 | case -EIO: /* probably a shutdown */ | |
676 | break; | |
677 | default: | |
678 | printk(KERN_ERR "%s: unrecognized error %d, exiting\n", | |
679 | __FUNCTION__, status); | |
680 | break; | |
681 | } | |
682 | rpc_exit(task, status); | |
683 | } | |
684 | ||
685 | /* | |
686 | * 2. Allocate the buffer. For details, see sched.c:rpc_malloc. | |
02107148 | 687 | * (Note: buffer memory is freed in xprt_release). |
1da177e4 LT |
688 | */ |
689 | static void | |
690 | call_allocate(struct rpc_task *task) | |
691 | { | |
02107148 CL |
692 | struct rpc_rqst *req = task->tk_rqstp; |
693 | struct rpc_xprt *xprt = task->tk_xprt; | |
1da177e4 LT |
694 | unsigned int bufsiz; |
695 | ||
696 | dprintk("RPC: %4d call_allocate (status %d)\n", | |
697 | task->tk_pid, task->tk_status); | |
698 | task->tk_action = call_bind; | |
02107148 | 699 | if (req->rq_buffer) |
1da177e4 LT |
700 | return; |
701 | ||
702 | /* FIXME: compute buffer requirements more exactly using | |
703 | * auth->au_wslack */ | |
704 | bufsiz = task->tk_msg.rpc_proc->p_bufsiz + RPC_SLACK_SPACE; | |
705 | ||
02107148 | 706 | if (xprt->ops->buf_alloc(task, bufsiz << 1) != NULL) |
1da177e4 LT |
707 | return; |
708 | printk(KERN_INFO "RPC: buffer allocation failed for task %p\n", task); | |
709 | ||
14b218a8 | 710 | if (RPC_IS_ASYNC(task) || !signalled()) { |
1da177e4 LT |
711 | xprt_release(task); |
712 | task->tk_action = call_reserve; | |
713 | rpc_delay(task, HZ>>4); | |
714 | return; | |
715 | } | |
716 | ||
717 | rpc_exit(task, -ERESTARTSYS); | |
718 | } | |
719 | ||
940e3318 TM |
720 | static inline int |
721 | rpc_task_need_encode(struct rpc_task *task) | |
722 | { | |
723 | return task->tk_rqstp->rq_snd_buf.len == 0; | |
724 | } | |
725 | ||
726 | static inline void | |
727 | rpc_task_force_reencode(struct rpc_task *task) | |
728 | { | |
729 | task->tk_rqstp->rq_snd_buf.len = 0; | |
730 | } | |
731 | ||
1da177e4 LT |
732 | /* |
733 | * 3. Encode arguments of an RPC call | |
734 | */ | |
735 | static void | |
736 | call_encode(struct rpc_task *task) | |
737 | { | |
1da177e4 LT |
738 | struct rpc_rqst *req = task->tk_rqstp; |
739 | struct xdr_buf *sndbuf = &req->rq_snd_buf; | |
740 | struct xdr_buf *rcvbuf = &req->rq_rcv_buf; | |
741 | unsigned int bufsiz; | |
742 | kxdrproc_t encode; | |
1da177e4 LT |
743 | u32 *p; |
744 | ||
745 | dprintk("RPC: %4d call_encode (status %d)\n", | |
746 | task->tk_pid, task->tk_status); | |
747 | ||
748 | /* Default buffer setup */ | |
02107148 CL |
749 | bufsiz = req->rq_bufsize >> 1; |
750 | sndbuf->head[0].iov_base = (void *)req->rq_buffer; | |
1da177e4 LT |
751 | sndbuf->head[0].iov_len = bufsiz; |
752 | sndbuf->tail[0].iov_len = 0; | |
753 | sndbuf->page_len = 0; | |
754 | sndbuf->len = 0; | |
755 | sndbuf->buflen = bufsiz; | |
02107148 | 756 | rcvbuf->head[0].iov_base = (void *)((char *)req->rq_buffer + bufsiz); |
1da177e4 LT |
757 | rcvbuf->head[0].iov_len = bufsiz; |
758 | rcvbuf->tail[0].iov_len = 0; | |
759 | rcvbuf->page_len = 0; | |
760 | rcvbuf->len = 0; | |
761 | rcvbuf->buflen = bufsiz; | |
762 | ||
763 | /* Encode header and provided arguments */ | |
764 | encode = task->tk_msg.rpc_proc->p_encode; | |
765 | if (!(p = call_header(task))) { | |
766 | printk(KERN_INFO "RPC: call_header failed, exit EIO\n"); | |
767 | rpc_exit(task, -EIO); | |
768 | return; | |
769 | } | |
f3680312 BF |
770 | if (encode == NULL) |
771 | return; | |
772 | ||
773 | task->tk_status = rpcauth_wrap_req(task, encode, req, p, | |
774 | task->tk_msg.rpc_argp); | |
775 | if (task->tk_status == -ENOMEM) { | |
776 | /* XXX: Is this sane? */ | |
777 | rpc_delay(task, 3*HZ); | |
778 | task->tk_status = -EAGAIN; | |
779 | } | |
1da177e4 LT |
780 | } |
781 | ||
782 | /* | |
783 | * 4. Get the server port number if not yet set | |
784 | */ | |
785 | static void | |
786 | call_bind(struct rpc_task *task) | |
787 | { | |
788 | struct rpc_clnt *clnt = task->tk_client; | |
1da177e4 | 789 | |
da351878 CL |
790 | dprintk("RPC: %4d call_bind (status %d)\n", |
791 | task->tk_pid, task->tk_status); | |
1da177e4 | 792 | |
da351878 | 793 | task->tk_action = call_connect; |
1da177e4 | 794 | if (!clnt->cl_port) { |
da351878 | 795 | task->tk_action = call_bind_status; |
03bf4b70 | 796 | task->tk_timeout = task->tk_xprt->bind_timeout; |
1da177e4 LT |
797 | rpc_getport(task, clnt); |
798 | } | |
799 | } | |
800 | ||
801 | /* | |
da351878 CL |
802 | * 4a. Sort out bind result |
803 | */ | |
804 | static void | |
805 | call_bind_status(struct rpc_task *task) | |
806 | { | |
807 | int status = -EACCES; | |
808 | ||
809 | if (task->tk_status >= 0) { | |
810 | dprintk("RPC: %4d call_bind_status (status %d)\n", | |
811 | task->tk_pid, task->tk_status); | |
812 | task->tk_status = 0; | |
813 | task->tk_action = call_connect; | |
814 | return; | |
815 | } | |
816 | ||
817 | switch (task->tk_status) { | |
818 | case -EACCES: | |
819 | dprintk("RPC: %4d remote rpcbind: RPC program/version unavailable\n", | |
820 | task->tk_pid); | |
ea635a51 CL |
821 | rpc_delay(task, 3*HZ); |
822 | goto retry_bind; | |
da351878 CL |
823 | case -ETIMEDOUT: |
824 | dprintk("RPC: %4d rpcbind request timed out\n", | |
825 | task->tk_pid); | |
826 | if (RPC_IS_SOFT(task)) { | |
827 | status = -EIO; | |
828 | break; | |
829 | } | |
830 | goto retry_bind; | |
831 | case -EPFNOSUPPORT: | |
832 | dprintk("RPC: %4d remote rpcbind service unavailable\n", | |
833 | task->tk_pid); | |
834 | break; | |
835 | case -EPROTONOSUPPORT: | |
836 | dprintk("RPC: %4d remote rpcbind version 2 unavailable\n", | |
837 | task->tk_pid); | |
838 | break; | |
839 | default: | |
840 | dprintk("RPC: %4d unrecognized rpcbind error (%d)\n", | |
841 | task->tk_pid, -task->tk_status); | |
842 | status = -EIO; | |
843 | break; | |
844 | } | |
845 | ||
846 | rpc_exit(task, status); | |
847 | return; | |
848 | ||
849 | retry_bind: | |
850 | task->tk_status = 0; | |
851 | task->tk_action = call_bind; | |
852 | return; | |
853 | } | |
854 | ||
855 | /* | |
856 | * 4b. Connect to the RPC server | |
1da177e4 LT |
857 | */ |
858 | static void | |
859 | call_connect(struct rpc_task *task) | |
860 | { | |
da351878 | 861 | struct rpc_xprt *xprt = task->tk_xprt; |
1da177e4 | 862 | |
da351878 CL |
863 | dprintk("RPC: %4d call_connect xprt %p %s connected\n", |
864 | task->tk_pid, xprt, | |
865 | (xprt_connected(xprt) ? "is" : "is not")); | |
1da177e4 | 866 | |
da351878 CL |
867 | task->tk_action = call_transmit; |
868 | if (!xprt_connected(xprt)) { | |
869 | task->tk_action = call_connect_status; | |
870 | if (task->tk_status < 0) | |
871 | return; | |
872 | xprt_connect(task); | |
1da177e4 | 873 | } |
1da177e4 LT |
874 | } |
875 | ||
876 | /* | |
da351878 | 877 | * 4c. Sort out connect result |
1da177e4 LT |
878 | */ |
879 | static void | |
880 | call_connect_status(struct rpc_task *task) | |
881 | { | |
882 | struct rpc_clnt *clnt = task->tk_client; | |
883 | int status = task->tk_status; | |
884 | ||
da351878 CL |
885 | dprintk("RPC: %5u call_connect_status (status %d)\n", |
886 | task->tk_pid, task->tk_status); | |
887 | ||
1da177e4 LT |
888 | task->tk_status = 0; |
889 | if (status >= 0) { | |
890 | clnt->cl_stats->netreconn++; | |
891 | task->tk_action = call_transmit; | |
892 | return; | |
893 | } | |
894 | ||
da351878 | 895 | /* Something failed: remote service port may have changed */ |
35f5a422 | 896 | rpc_force_rebind(clnt); |
da351878 | 897 | |
1da177e4 LT |
898 | switch (status) { |
899 | case -ENOTCONN: | |
900 | case -ETIMEDOUT: | |
901 | case -EAGAIN: | |
da351878 | 902 | task->tk_action = call_bind; |
1da177e4 LT |
903 | break; |
904 | default: | |
905 | rpc_exit(task, -EIO); | |
da351878 | 906 | break; |
1da177e4 LT |
907 | } |
908 | } | |
909 | ||
910 | /* | |
911 | * 5. Transmit the RPC request, and wait for reply | |
912 | */ | |
913 | static void | |
914 | call_transmit(struct rpc_task *task) | |
915 | { | |
916 | dprintk("RPC: %4d call_transmit (status %d)\n", | |
917 | task->tk_pid, task->tk_status); | |
918 | ||
919 | task->tk_action = call_status; | |
920 | if (task->tk_status < 0) | |
921 | return; | |
922 | task->tk_status = xprt_prepare_transmit(task); | |
923 | if (task->tk_status != 0) | |
924 | return; | |
925 | /* Encode here so that rpcsec_gss can use correct sequence number. */ | |
940e3318 TM |
926 | if (rpc_task_need_encode(task)) { |
927 | task->tk_rqstp->rq_bytes_sent = 0; | |
1da177e4 | 928 | call_encode(task); |
5e5ce5be TM |
929 | /* Did the encode result in an error condition? */ |
930 | if (task->tk_status != 0) | |
931 | goto out_nosend; | |
932 | } | |
940e3318 | 933 | task->tk_action = call_transmit_status; |
1da177e4 LT |
934 | xprt_transmit(task); |
935 | if (task->tk_status < 0) | |
936 | return; | |
937 | if (!task->tk_msg.rpc_proc->p_decode) { | |
abbcf28f | 938 | task->tk_action = rpc_exit_task; |
1da177e4 LT |
939 | rpc_wake_up_task(task); |
940 | } | |
5e5ce5be TM |
941 | return; |
942 | out_nosend: | |
943 | /* release socket write lock before attempting to handle error */ | |
944 | xprt_abort_transmit(task); | |
940e3318 | 945 | rpc_task_force_reencode(task); |
1da177e4 LT |
946 | } |
947 | ||
948 | /* | |
949 | * 6. Sort out the RPC call status | |
950 | */ | |
951 | static void | |
952 | call_status(struct rpc_task *task) | |
953 | { | |
954 | struct rpc_clnt *clnt = task->tk_client; | |
955 | struct rpc_rqst *req = task->tk_rqstp; | |
956 | int status; | |
957 | ||
958 | if (req->rq_received > 0 && !req->rq_bytes_sent) | |
959 | task->tk_status = req->rq_received; | |
960 | ||
961 | dprintk("RPC: %4d call_status (status %d)\n", | |
962 | task->tk_pid, task->tk_status); | |
963 | ||
964 | status = task->tk_status; | |
965 | if (status >= 0) { | |
966 | task->tk_action = call_decode; | |
967 | return; | |
968 | } | |
969 | ||
970 | task->tk_status = 0; | |
971 | switch(status) { | |
972 | case -ETIMEDOUT: | |
973 | task->tk_action = call_timeout; | |
974 | break; | |
975 | case -ECONNREFUSED: | |
976 | case -ENOTCONN: | |
35f5a422 | 977 | rpc_force_rebind(clnt); |
1da177e4 LT |
978 | task->tk_action = call_bind; |
979 | break; | |
980 | case -EAGAIN: | |
981 | task->tk_action = call_transmit; | |
982 | break; | |
983 | case -EIO: | |
984 | /* shutdown or soft timeout */ | |
985 | rpc_exit(task, status); | |
986 | break; | |
987 | default: | |
f518e35a | 988 | printk("%s: RPC call returned error %d\n", |
1da177e4 LT |
989 | clnt->cl_protname, -status); |
990 | rpc_exit(task, status); | |
991 | break; | |
992 | } | |
993 | } | |
994 | ||
995 | /* | |
940e3318 TM |
996 | * 6a. Handle transmission errors. |
997 | */ | |
998 | static void | |
999 | call_transmit_status(struct rpc_task *task) | |
1000 | { | |
1001 | if (task->tk_status != -EAGAIN) | |
1002 | rpc_task_force_reencode(task); | |
1003 | call_status(task); | |
1004 | } | |
1005 | ||
1006 | /* | |
1007 | * 6b. Handle RPC timeout | |
1da177e4 LT |
1008 | * We do not release the request slot, so we keep using the |
1009 | * same XID for all retransmits. | |
1010 | */ | |
1011 | static void | |
1012 | call_timeout(struct rpc_task *task) | |
1013 | { | |
1014 | struct rpc_clnt *clnt = task->tk_client; | |
1015 | ||
1016 | if (xprt_adjust_timeout(task->tk_rqstp) == 0) { | |
1017 | dprintk("RPC: %4d call_timeout (minor)\n", task->tk_pid); | |
1018 | goto retry; | |
1019 | } | |
1020 | ||
1021 | dprintk("RPC: %4d call_timeout (major)\n", task->tk_pid); | |
ef759a2e CL |
1022 | task->tk_timeouts++; |
1023 | ||
1da177e4 | 1024 | if (RPC_IS_SOFT(task)) { |
f518e35a | 1025 | printk(KERN_NOTICE "%s: server %s not responding, timed out\n", |
1da177e4 LT |
1026 | clnt->cl_protname, clnt->cl_server); |
1027 | rpc_exit(task, -EIO); | |
1028 | return; | |
1029 | } | |
1030 | ||
f518e35a | 1031 | if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) { |
1da177e4 LT |
1032 | task->tk_flags |= RPC_CALL_MAJORSEEN; |
1033 | printk(KERN_NOTICE "%s: server %s not responding, still trying\n", | |
1034 | clnt->cl_protname, clnt->cl_server); | |
1035 | } | |
35f5a422 | 1036 | rpc_force_rebind(clnt); |
1da177e4 LT |
1037 | |
1038 | retry: | |
1039 | clnt->cl_stats->rpcretrans++; | |
1040 | task->tk_action = call_bind; | |
1041 | task->tk_status = 0; | |
1042 | } | |
1043 | ||
1044 | /* | |
1045 | * 7. Decode the RPC reply | |
1046 | */ | |
1047 | static void | |
1048 | call_decode(struct rpc_task *task) | |
1049 | { | |
1050 | struct rpc_clnt *clnt = task->tk_client; | |
1051 | struct rpc_rqst *req = task->tk_rqstp; | |
1052 | kxdrproc_t decode = task->tk_msg.rpc_proc->p_decode; | |
1053 | u32 *p; | |
1054 | ||
1055 | dprintk("RPC: %4d call_decode (status %d)\n", | |
1056 | task->tk_pid, task->tk_status); | |
1057 | ||
f518e35a | 1058 | if (task->tk_flags & RPC_CALL_MAJORSEEN) { |
1da177e4 LT |
1059 | printk(KERN_NOTICE "%s: server %s OK\n", |
1060 | clnt->cl_protname, clnt->cl_server); | |
1061 | task->tk_flags &= ~RPC_CALL_MAJORSEEN; | |
1062 | } | |
1063 | ||
1064 | if (task->tk_status < 12) { | |
1065 | if (!RPC_IS_SOFT(task)) { | |
1066 | task->tk_action = call_bind; | |
1067 | clnt->cl_stats->rpcretrans++; | |
1068 | goto out_retry; | |
1069 | } | |
1070 | printk(KERN_WARNING "%s: too small RPC reply size (%d bytes)\n", | |
1071 | clnt->cl_protname, task->tk_status); | |
1072 | rpc_exit(task, -EIO); | |
1073 | return; | |
1074 | } | |
1075 | ||
43ac3f29 TM |
1076 | /* |
1077 | * Ensure that we see all writes made by xprt_complete_rqst() | |
1078 | * before it changed req->rq_received. | |
1079 | */ | |
1080 | smp_rmb(); | |
1da177e4 LT |
1081 | req->rq_rcv_buf.len = req->rq_private_buf.len; |
1082 | ||
1083 | /* Check that the softirq receive buffer is valid */ | |
1084 | WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf, | |
1085 | sizeof(req->rq_rcv_buf)) != 0); | |
1086 | ||
1087 | /* Verify the RPC header */ | |
abbcf28f TM |
1088 | p = call_verify(task); |
1089 | if (IS_ERR(p)) { | |
1090 | if (p == ERR_PTR(-EAGAIN)) | |
1091 | goto out_retry; | |
1092 | return; | |
1da177e4 LT |
1093 | } |
1094 | ||
abbcf28f | 1095 | task->tk_action = rpc_exit_task; |
1da177e4 LT |
1096 | |
1097 | if (decode) | |
1098 | task->tk_status = rpcauth_unwrap_resp(task, decode, req, p, | |
1099 | task->tk_msg.rpc_resp); | |
1100 | dprintk("RPC: %4d call_decode result %d\n", task->tk_pid, | |
1101 | task->tk_status); | |
1102 | return; | |
1103 | out_retry: | |
1104 | req->rq_received = req->rq_private_buf.len = 0; | |
1105 | task->tk_status = 0; | |
1106 | } | |
1107 | ||
1108 | /* | |
1109 | * 8. Refresh the credentials if rejected by the server | |
1110 | */ | |
1111 | static void | |
1112 | call_refresh(struct rpc_task *task) | |
1113 | { | |
1114 | dprintk("RPC: %4d call_refresh\n", task->tk_pid); | |
1115 | ||
1116 | xprt_release(task); /* Must do to obtain new XID */ | |
1117 | task->tk_action = call_refreshresult; | |
1118 | task->tk_status = 0; | |
1119 | task->tk_client->cl_stats->rpcauthrefresh++; | |
1120 | rpcauth_refreshcred(task); | |
1121 | } | |
1122 | ||
1123 | /* | |
1124 | * 8a. Process the results of a credential refresh | |
1125 | */ | |
1126 | static void | |
1127 | call_refreshresult(struct rpc_task *task) | |
1128 | { | |
1129 | int status = task->tk_status; | |
1130 | dprintk("RPC: %4d call_refreshresult (status %d)\n", | |
1131 | task->tk_pid, task->tk_status); | |
1132 | ||
1133 | task->tk_status = 0; | |
1134 | task->tk_action = call_reserve; | |
1135 | if (status >= 0 && rpcauth_uptodatecred(task)) | |
1136 | return; | |
1137 | if (status == -EACCES) { | |
1138 | rpc_exit(task, -EACCES); | |
1139 | return; | |
1140 | } | |
1141 | task->tk_action = call_refresh; | |
1142 | if (status != -ETIMEDOUT) | |
1143 | rpc_delay(task, 3*HZ); | |
1144 | return; | |
1145 | } | |
1146 | ||
1147 | /* | |
1148 | * Call header serialization | |
1149 | */ | |
1150 | static u32 * | |
1151 | call_header(struct rpc_task *task) | |
1152 | { | |
1153 | struct rpc_clnt *clnt = task->tk_client; | |
1da177e4 LT |
1154 | struct rpc_rqst *req = task->tk_rqstp; |
1155 | u32 *p = req->rq_svec[0].iov_base; | |
1156 | ||
1157 | /* FIXME: check buffer size? */ | |
808012fb CL |
1158 | |
1159 | p = xprt_skip_transport_header(task->tk_xprt, p); | |
1da177e4 LT |
1160 | *p++ = req->rq_xid; /* XID */ |
1161 | *p++ = htonl(RPC_CALL); /* CALL */ | |
1162 | *p++ = htonl(RPC_VERSION); /* RPC version */ | |
1163 | *p++ = htonl(clnt->cl_prog); /* program number */ | |
1164 | *p++ = htonl(clnt->cl_vers); /* program version */ | |
1165 | *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */ | |
334ccfd5 TM |
1166 | p = rpcauth_marshcred(task, p); |
1167 | req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p); | |
1168 | return p; | |
1da177e4 LT |
1169 | } |
1170 | ||
1171 | /* | |
1172 | * Reply header verification | |
1173 | */ | |
1174 | static u32 * | |
1175 | call_verify(struct rpc_task *task) | |
1176 | { | |
1177 | struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0]; | |
1178 | int len = task->tk_rqstp->rq_rcv_buf.len >> 2; | |
1179 | u32 *p = iov->iov_base, n; | |
1180 | int error = -EACCES; | |
1181 | ||
1182 | if ((len -= 3) < 0) | |
1183 | goto out_overflow; | |
1184 | p += 1; /* skip XID */ | |
1185 | ||
1186 | if ((n = ntohl(*p++)) != RPC_REPLY) { | |
1187 | printk(KERN_WARNING "call_verify: not an RPC reply: %x\n", n); | |
abbcf28f | 1188 | goto out_garbage; |
1da177e4 LT |
1189 | } |
1190 | if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) { | |
1191 | if (--len < 0) | |
1192 | goto out_overflow; | |
1193 | switch ((n = ntohl(*p++))) { | |
1194 | case RPC_AUTH_ERROR: | |
1195 | break; | |
1196 | case RPC_MISMATCH: | |
cdf47706 AG |
1197 | dprintk("%s: RPC call version mismatch!\n", __FUNCTION__); |
1198 | error = -EPROTONOSUPPORT; | |
1199 | goto out_err; | |
1da177e4 | 1200 | default: |
cdf47706 | 1201 | dprintk("%s: RPC call rejected, unknown error: %x\n", __FUNCTION__, n); |
1da177e4 LT |
1202 | goto out_eio; |
1203 | } | |
1204 | if (--len < 0) | |
1205 | goto out_overflow; | |
1206 | switch ((n = ntohl(*p++))) { | |
1207 | case RPC_AUTH_REJECTEDCRED: | |
1208 | case RPC_AUTH_REJECTEDVERF: | |
1209 | case RPCSEC_GSS_CREDPROBLEM: | |
1210 | case RPCSEC_GSS_CTXPROBLEM: | |
1211 | if (!task->tk_cred_retry) | |
1212 | break; | |
1213 | task->tk_cred_retry--; | |
1214 | dprintk("RPC: %4d call_verify: retry stale creds\n", | |
1215 | task->tk_pid); | |
1216 | rpcauth_invalcred(task); | |
1217 | task->tk_action = call_refresh; | |
abbcf28f | 1218 | goto out_retry; |
1da177e4 LT |
1219 | case RPC_AUTH_BADCRED: |
1220 | case RPC_AUTH_BADVERF: | |
1221 | /* possibly garbled cred/verf? */ | |
1222 | if (!task->tk_garb_retry) | |
1223 | break; | |
1224 | task->tk_garb_retry--; | |
1225 | dprintk("RPC: %4d call_verify: retry garbled creds\n", | |
1226 | task->tk_pid); | |
1227 | task->tk_action = call_bind; | |
abbcf28f | 1228 | goto out_retry; |
1da177e4 | 1229 | case RPC_AUTH_TOOWEAK: |
1356b8c2 LS |
1230 | printk(KERN_NOTICE "call_verify: server %s requires stronger " |
1231 | "authentication.\n", task->tk_client->cl_server); | |
1da177e4 LT |
1232 | break; |
1233 | default: | |
1234 | printk(KERN_WARNING "call_verify: unknown auth error: %x\n", n); | |
1235 | error = -EIO; | |
1236 | } | |
1237 | dprintk("RPC: %4d call_verify: call rejected %d\n", | |
1238 | task->tk_pid, n); | |
1239 | goto out_err; | |
1240 | } | |
1241 | if (!(p = rpcauth_checkverf(task, p))) { | |
1242 | printk(KERN_WARNING "call_verify: auth check failed\n"); | |
abbcf28f | 1243 | goto out_garbage; /* bad verifier, retry */ |
1da177e4 LT |
1244 | } |
1245 | len = p - (u32 *)iov->iov_base - 1; | |
1246 | if (len < 0) | |
1247 | goto out_overflow; | |
1248 | switch ((n = ntohl(*p++))) { | |
1249 | case RPC_SUCCESS: | |
1250 | return p; | |
1251 | case RPC_PROG_UNAVAIL: | |
cdf47706 | 1252 | dprintk("RPC: call_verify: program %u is unsupported by server %s\n", |
1da177e4 LT |
1253 | (unsigned int)task->tk_client->cl_prog, |
1254 | task->tk_client->cl_server); | |
cdf47706 AG |
1255 | error = -EPFNOSUPPORT; |
1256 | goto out_err; | |
1da177e4 | 1257 | case RPC_PROG_MISMATCH: |
cdf47706 | 1258 | dprintk("RPC: call_verify: program %u, version %u unsupported by server %s\n", |
1da177e4 LT |
1259 | (unsigned int)task->tk_client->cl_prog, |
1260 | (unsigned int)task->tk_client->cl_vers, | |
1261 | task->tk_client->cl_server); | |
cdf47706 AG |
1262 | error = -EPROTONOSUPPORT; |
1263 | goto out_err; | |
1da177e4 | 1264 | case RPC_PROC_UNAVAIL: |
cdf47706 | 1265 | dprintk("RPC: call_verify: proc %p unsupported by program %u, version %u on server %s\n", |
1da177e4 LT |
1266 | task->tk_msg.rpc_proc, |
1267 | task->tk_client->cl_prog, | |
1268 | task->tk_client->cl_vers, | |
1269 | task->tk_client->cl_server); | |
cdf47706 AG |
1270 | error = -EOPNOTSUPP; |
1271 | goto out_err; | |
1da177e4 LT |
1272 | case RPC_GARBAGE_ARGS: |
1273 | dprintk("RPC: %4d %s: server saw garbage\n", task->tk_pid, __FUNCTION__); | |
1274 | break; /* retry */ | |
1275 | default: | |
1276 | printk(KERN_WARNING "call_verify: server accept status: %x\n", n); | |
1277 | /* Also retry */ | |
1278 | } | |
1279 | ||
abbcf28f | 1280 | out_garbage: |
1da177e4 LT |
1281 | task->tk_client->cl_stats->rpcgarbage++; |
1282 | if (task->tk_garb_retry) { | |
1283 | task->tk_garb_retry--; | |
cdf47706 | 1284 | dprintk("RPC %s: retrying %4d\n", __FUNCTION__, task->tk_pid); |
1da177e4 | 1285 | task->tk_action = call_bind; |
abbcf28f TM |
1286 | out_retry: |
1287 | return ERR_PTR(-EAGAIN); | |
1da177e4 LT |
1288 | } |
1289 | printk(KERN_WARNING "RPC %s: retry failed, exit EIO\n", __FUNCTION__); | |
1290 | out_eio: | |
1291 | error = -EIO; | |
1292 | out_err: | |
1293 | rpc_exit(task, error); | |
abbcf28f | 1294 | return ERR_PTR(error); |
1da177e4 LT |
1295 | out_overflow: |
1296 | printk(KERN_WARNING "RPC %s: server reply was truncated.\n", __FUNCTION__); | |
abbcf28f | 1297 | goto out_garbage; |
1da177e4 | 1298 | } |
5ee0ed7d TM |
1299 | |
1300 | static int rpcproc_encode_null(void *rqstp, u32 *data, void *obj) | |
1301 | { | |
1302 | return 0; | |
1303 | } | |
1304 | ||
1305 | static int rpcproc_decode_null(void *rqstp, u32 *data, void *obj) | |
1306 | { | |
1307 | return 0; | |
1308 | } | |
1309 | ||
1310 | static struct rpc_procinfo rpcproc_null = { | |
1311 | .p_encode = rpcproc_encode_null, | |
1312 | .p_decode = rpcproc_decode_null, | |
1313 | }; | |
1314 | ||
1315 | int rpc_ping(struct rpc_clnt *clnt, int flags) | |
1316 | { | |
1317 | struct rpc_message msg = { | |
1318 | .rpc_proc = &rpcproc_null, | |
1319 | }; | |
1320 | int err; | |
1321 | msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0); | |
1322 | err = rpc_call_sync(clnt, &msg, flags); | |
1323 | put_rpccred(msg.rpc_cred); | |
1324 | return err; | |
1325 | } |