]>
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 | * | |
1da177e4 LT |
16 | * Copyright (C) 1992,1993 Rick Sladkey <jrs@world.std.com> |
17 | * Copyright (C) 1995,1996 Olaf Kirch <okir@monad.swb.de> | |
18 | */ | |
19 | ||
1da177e4 LT |
20 | |
21 | #include <linux/module.h> | |
22 | #include <linux/types.h> | |
cb3997b5 | 23 | #include <linux/kallsyms.h> |
1da177e4 | 24 | #include <linux/mm.h> |
23ac6581 TM |
25 | #include <linux/namei.h> |
26 | #include <linux/mount.h> | |
1da177e4 | 27 | #include <linux/slab.h> |
1da177e4 | 28 | #include <linux/utsname.h> |
11c556b3 | 29 | #include <linux/workqueue.h> |
176e21ee | 30 | #include <linux/in.h> |
510deb0d | 31 | #include <linux/in6.h> |
176e21ee | 32 | #include <linux/un.h> |
2446ab60 | 33 | #include <linux/rcupdate.h> |
1da177e4 LT |
34 | |
35 | #include <linux/sunrpc/clnt.h> | |
5976687a | 36 | #include <linux/sunrpc/addr.h> |
1da177e4 | 37 | #include <linux/sunrpc/rpc_pipe_fs.h> |
11c556b3 | 38 | #include <linux/sunrpc/metrics.h> |
55ae1aab | 39 | #include <linux/sunrpc/bc_xprt.h> |
5753cba1 | 40 | #include <trace/events/sunrpc.h> |
1da177e4 | 41 | |
55ae1aab | 42 | #include "sunrpc.h" |
70abc49b | 43 | #include "netns.h" |
1da177e4 | 44 | |
1da177e4 LT |
45 | #ifdef RPC_DEBUG |
46 | # define RPCDBG_FACILITY RPCDBG_CALL | |
47 | #endif | |
48 | ||
46121cf7 CL |
49 | #define dprint_status(t) \ |
50 | dprintk("RPC: %5u %s (status %d)\n", t->tk_pid, \ | |
0dc47877 | 51 | __func__, t->tk_status) |
46121cf7 | 52 | |
188fef11 TM |
53 | /* |
54 | * All RPC clients are linked into this list | |
55 | */ | |
188fef11 | 56 | |
1da177e4 LT |
57 | static DECLARE_WAIT_QUEUE_HEAD(destroy_wait); |
58 | ||
59 | ||
60 | static void call_start(struct rpc_task *task); | |
61 | static void call_reserve(struct rpc_task *task); | |
62 | static void call_reserveresult(struct rpc_task *task); | |
63 | static void call_allocate(struct rpc_task *task); | |
1da177e4 LT |
64 | static void call_decode(struct rpc_task *task); |
65 | static void call_bind(struct rpc_task *task); | |
da351878 | 66 | static void call_bind_status(struct rpc_task *task); |
1da177e4 | 67 | static void call_transmit(struct rpc_task *task); |
9e00abc3 | 68 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
55ae1aab | 69 | static void call_bc_transmit(struct rpc_task *task); |
9e00abc3 | 70 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
1da177e4 | 71 | static void call_status(struct rpc_task *task); |
940e3318 | 72 | static void call_transmit_status(struct rpc_task *task); |
1da177e4 LT |
73 | static void call_refresh(struct rpc_task *task); |
74 | static void call_refreshresult(struct rpc_task *task); | |
75 | static void call_timeout(struct rpc_task *task); | |
76 | static void call_connect(struct rpc_task *task); | |
77 | static void call_connect_status(struct rpc_task *task); | |
1da177e4 | 78 | |
b0e1c57e CL |
79 | static __be32 *rpc_encode_header(struct rpc_task *task); |
80 | static __be32 *rpc_verify_header(struct rpc_task *task); | |
caabea8a | 81 | static int rpc_ping(struct rpc_clnt *clnt); |
64c91a1f | 82 | |
188fef11 TM |
83 | static void rpc_register_client(struct rpc_clnt *clnt) |
84 | { | |
2446ab60 TM |
85 | struct net *net = rpc_net_ns(clnt); |
86 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
70abc49b SK |
87 | |
88 | spin_lock(&sn->rpc_client_lock); | |
89 | list_add(&clnt->cl_clients, &sn->all_clients); | |
90 | spin_unlock(&sn->rpc_client_lock); | |
188fef11 TM |
91 | } |
92 | ||
93 | static void rpc_unregister_client(struct rpc_clnt *clnt) | |
94 | { | |
2446ab60 TM |
95 | struct net *net = rpc_net_ns(clnt); |
96 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
70abc49b SK |
97 | |
98 | spin_lock(&sn->rpc_client_lock); | |
188fef11 | 99 | list_del(&clnt->cl_clients); |
70abc49b | 100 | spin_unlock(&sn->rpc_client_lock); |
188fef11 | 101 | } |
1da177e4 | 102 | |
0157d021 SK |
103 | static void __rpc_clnt_remove_pipedir(struct rpc_clnt *clnt) |
104 | { | |
c36dcfe1 | 105 | rpc_remove_client_dir(clnt); |
0157d021 SK |
106 | } |
107 | ||
108 | static void rpc_clnt_remove_pipedir(struct rpc_clnt *clnt) | |
109 | { | |
2446ab60 | 110 | struct net *net = rpc_net_ns(clnt); |
0157d021 | 111 | struct super_block *pipefs_sb; |
0157d021 | 112 | |
2446ab60 | 113 | pipefs_sb = rpc_get_sb_net(net); |
0157d021 | 114 | if (pipefs_sb) { |
0157d021 | 115 | __rpc_clnt_remove_pipedir(clnt); |
2446ab60 | 116 | rpc_put_sb_net(net); |
0157d021 | 117 | } |
0157d021 SK |
118 | } |
119 | ||
120 | static struct dentry *rpc_setup_pipedir_sb(struct super_block *sb, | |
41b6b4d0 | 121 | struct rpc_clnt *clnt) |
1da177e4 | 122 | { |
f134585a | 123 | static uint32_t clntid; |
41b6b4d0 | 124 | const char *dir_name = clnt->cl_program->pipe_dir_name; |
23ac6581 | 125 | char name[15]; |
0157d021 | 126 | struct dentry *dir, *dentry; |
1da177e4 | 127 | |
0157d021 | 128 | dir = rpc_d_lookup_sb(sb, dir_name); |
922eeac3 WAA |
129 | if (dir == NULL) { |
130 | pr_info("RPC: pipefs directory doesn't exist: %s\n", dir_name); | |
0157d021 | 131 | return dir; |
922eeac3 | 132 | } |
f134585a | 133 | for (;;) { |
a95e691f | 134 | snprintf(name, sizeof(name), "clnt%x", (unsigned int)clntid++); |
23ac6581 | 135 | name[sizeof(name) - 1] = '\0'; |
a95e691f | 136 | dentry = rpc_create_client_dir(dir, name, clnt); |
0157d021 | 137 | if (!IS_ERR(dentry)) |
23ac6581 | 138 | break; |
a95e691f AV |
139 | if (dentry == ERR_PTR(-EEXIST)) |
140 | continue; | |
141 | printk(KERN_INFO "RPC: Couldn't create pipefs entry" | |
142 | " %s/%s, error %ld\n", | |
143 | dir_name, name, PTR_ERR(dentry)); | |
144 | break; | |
1da177e4 | 145 | } |
0157d021 SK |
146 | dput(dir); |
147 | return dentry; | |
148 | } | |
149 | ||
150 | static int | |
41b6b4d0 | 151 | rpc_setup_pipedir(struct super_block *pipefs_sb, struct rpc_clnt *clnt) |
0157d021 | 152 | { |
30507f58 | 153 | struct dentry *dentry; |
0157d021 | 154 | |
c36dcfe1 TM |
155 | if (clnt->cl_program->pipe_dir_name != NULL) { |
156 | dentry = rpc_setup_pipedir_sb(pipefs_sb, clnt); | |
157 | if (IS_ERR(dentry)) | |
158 | return PTR_ERR(dentry); | |
159 | } | |
23ac6581 | 160 | return 0; |
1da177e4 LT |
161 | } |
162 | ||
41b6b4d0 | 163 | static int rpc_clnt_skip_event(struct rpc_clnt *clnt, unsigned long event) |
ea8cfa06 | 164 | { |
41b6b4d0 | 165 | if (clnt->cl_program->pipe_dir_name == NULL) |
4f6bb246 | 166 | return 1; |
41b6b4d0 | 167 | |
c36dcfe1 TM |
168 | switch (event) { |
169 | case RPC_PIPEFS_MOUNT: | |
170 | if (clnt->cl_pipedir_objects.pdh_dentry != NULL) | |
171 | return 1; | |
172 | if (atomic_read(&clnt->cl_count) == 0) | |
173 | return 1; | |
174 | break; | |
175 | case RPC_PIPEFS_UMOUNT: | |
176 | if (clnt->cl_pipedir_objects.pdh_dentry == NULL) | |
177 | return 1; | |
178 | break; | |
179 | } | |
ea8cfa06 SK |
180 | return 0; |
181 | } | |
182 | ||
183 | static int __rpc_clnt_handle_event(struct rpc_clnt *clnt, unsigned long event, | |
184 | struct super_block *sb) | |
80df9d20 SK |
185 | { |
186 | struct dentry *dentry; | |
187 | int err = 0; | |
188 | ||
189 | switch (event) { | |
190 | case RPC_PIPEFS_MOUNT: | |
41b6b4d0 | 191 | dentry = rpc_setup_pipedir_sb(sb, clnt); |
922eeac3 WAA |
192 | if (!dentry) |
193 | return -ENOENT; | |
80df9d20 SK |
194 | if (IS_ERR(dentry)) |
195 | return PTR_ERR(dentry); | |
80df9d20 SK |
196 | break; |
197 | case RPC_PIPEFS_UMOUNT: | |
198 | __rpc_clnt_remove_pipedir(clnt); | |
199 | break; | |
200 | default: | |
201 | printk(KERN_ERR "%s: unknown event: %ld\n", __func__, event); | |
202 | return -ENOTSUPP; | |
203 | } | |
204 | return err; | |
205 | } | |
206 | ||
ea8cfa06 SK |
207 | static int __rpc_pipefs_event(struct rpc_clnt *clnt, unsigned long event, |
208 | struct super_block *sb) | |
209 | { | |
210 | int error = 0; | |
211 | ||
212 | for (;; clnt = clnt->cl_parent) { | |
213 | if (!rpc_clnt_skip_event(clnt, event)) | |
214 | error = __rpc_clnt_handle_event(clnt, event, sb); | |
215 | if (error || clnt == clnt->cl_parent) | |
216 | break; | |
217 | } | |
218 | return error; | |
219 | } | |
220 | ||
da3b4622 SK |
221 | static struct rpc_clnt *rpc_get_client_for_event(struct net *net, int event) |
222 | { | |
223 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
224 | struct rpc_clnt *clnt; | |
225 | ||
226 | spin_lock(&sn->rpc_client_lock); | |
227 | list_for_each_entry(clnt, &sn->all_clients, cl_clients) { | |
ea8cfa06 | 228 | if (rpc_clnt_skip_event(clnt, event)) |
da3b4622 | 229 | continue; |
da3b4622 SK |
230 | spin_unlock(&sn->rpc_client_lock); |
231 | return clnt; | |
232 | } | |
233 | spin_unlock(&sn->rpc_client_lock); | |
234 | return NULL; | |
235 | } | |
236 | ||
80df9d20 SK |
237 | static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event, |
238 | void *ptr) | |
239 | { | |
240 | struct super_block *sb = ptr; | |
241 | struct rpc_clnt *clnt; | |
242 | int error = 0; | |
80df9d20 | 243 | |
da3b4622 | 244 | while ((clnt = rpc_get_client_for_event(sb->s_fs_info, event))) { |
80df9d20 SK |
245 | error = __rpc_pipefs_event(clnt, event, sb); |
246 | if (error) | |
247 | break; | |
248 | } | |
80df9d20 SK |
249 | return error; |
250 | } | |
251 | ||
252 | static struct notifier_block rpc_clients_block = { | |
253 | .notifier_call = rpc_pipefs_event, | |
eee17325 | 254 | .priority = SUNRPC_PIPEFS_RPC_PRIO, |
80df9d20 SK |
255 | }; |
256 | ||
257 | int rpc_clients_notifier_register(void) | |
258 | { | |
259 | return rpc_pipefs_notifier_register(&rpc_clients_block); | |
260 | } | |
261 | ||
262 | void rpc_clients_notifier_unregister(void) | |
263 | { | |
264 | return rpc_pipefs_notifier_unregister(&rpc_clients_block); | |
265 | } | |
266 | ||
cbbb3449 TM |
267 | static void rpc_clnt_set_nodename(struct rpc_clnt *clnt, const char *nodename) |
268 | { | |
269 | clnt->cl_nodelen = strlen(nodename); | |
270 | if (clnt->cl_nodelen > UNX_MAXNODENAME) | |
271 | clnt->cl_nodelen = UNX_MAXNODENAME; | |
272 | memcpy(clnt->cl_nodename, nodename, clnt->cl_nodelen); | |
273 | } | |
274 | ||
e73f4cc0 SK |
275 | static int rpc_client_register(const struct rpc_create_args *args, |
276 | struct rpc_clnt *clnt) | |
277 | { | |
c2190661 TM |
278 | struct rpc_auth_create_args auth_args = { |
279 | .pseudoflavor = args->authflavor, | |
280 | .target_name = args->client_name, | |
281 | }; | |
e73f4cc0 SK |
282 | struct rpc_auth *auth; |
283 | struct net *net = rpc_net_ns(clnt); | |
284 | struct super_block *pipefs_sb; | |
eeee2452 | 285 | int err; |
e73f4cc0 SK |
286 | |
287 | pipefs_sb = rpc_get_sb_net(net); | |
288 | if (pipefs_sb) { | |
41b6b4d0 | 289 | err = rpc_setup_pipedir(pipefs_sb, clnt); |
e73f4cc0 SK |
290 | if (err) |
291 | goto out; | |
292 | } | |
293 | ||
eeee2452 TM |
294 | rpc_register_client(clnt); |
295 | if (pipefs_sb) | |
296 | rpc_put_sb_net(net); | |
297 | ||
c2190661 | 298 | auth = rpcauth_create(&auth_args, clnt); |
e73f4cc0 SK |
299 | if (IS_ERR(auth)) { |
300 | dprintk("RPC: Couldn't create auth handle (flavor %u)\n", | |
301 | args->authflavor); | |
302 | err = PTR_ERR(auth); | |
303 | goto err_auth; | |
304 | } | |
eeee2452 TM |
305 | return 0; |
306 | err_auth: | |
307 | pipefs_sb = rpc_get_sb_net(net); | |
1540c5d3 | 308 | rpc_unregister_client(clnt); |
eeee2452 | 309 | __rpc_clnt_remove_pipedir(clnt); |
e73f4cc0 SK |
310 | out: |
311 | if (pipefs_sb) | |
312 | rpc_put_sb_net(net); | |
313 | return err; | |
e73f4cc0 SK |
314 | } |
315 | ||
2f048db4 TM |
316 | static DEFINE_IDA(rpc_clids); |
317 | ||
318 | static int rpc_alloc_clid(struct rpc_clnt *clnt) | |
319 | { | |
320 | int clid; | |
321 | ||
322 | clid = ida_simple_get(&rpc_clids, 0, 0, GFP_KERNEL); | |
323 | if (clid < 0) | |
324 | return clid; | |
325 | clnt->cl_clid = clid; | |
326 | return 0; | |
327 | } | |
328 | ||
329 | static void rpc_free_clid(struct rpc_clnt *clnt) | |
330 | { | |
331 | ida_simple_remove(&rpc_clids, clnt->cl_clid); | |
332 | } | |
333 | ||
280ebcf9 TM |
334 | static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, |
335 | struct rpc_xprt *xprt, | |
336 | struct rpc_clnt *parent) | |
1da177e4 | 337 | { |
a613fa16 TM |
338 | const struct rpc_program *program = args->program; |
339 | const struct rpc_version *version; | |
1da177e4 LT |
340 | struct rpc_clnt *clnt = NULL; |
341 | int err; | |
06b8d255 CL |
342 | |
343 | /* sanity check the name before trying to print it */ | |
46121cf7 | 344 | dprintk("RPC: creating %s client for %s (xprt %p)\n", |
698b6d08 | 345 | program->name, args->servername, xprt); |
1da177e4 | 346 | |
4ada539e TM |
347 | err = rpciod_up(); |
348 | if (err) | |
349 | goto out_no_rpciod; | |
698b6d08 | 350 | |
f05c124a | 351 | err = -EINVAL; |
698b6d08 TM |
352 | if (args->version >= program->nrvers) |
353 | goto out_err; | |
354 | version = program->version[args->version]; | |
355 | if (version == NULL) | |
1da177e4 LT |
356 | goto out_err; |
357 | ||
358 | err = -ENOMEM; | |
0da974f4 | 359 | clnt = kzalloc(sizeof(*clnt), GFP_KERNEL); |
1da177e4 LT |
360 | if (!clnt) |
361 | goto out_err; | |
280ebcf9 | 362 | clnt->cl_parent = parent ? : clnt; |
1da177e4 | 363 | |
2f048db4 TM |
364 | err = rpc_alloc_clid(clnt); |
365 | if (err) | |
366 | goto out_no_clid; | |
1da177e4 | 367 | |
2446ab60 | 368 | rcu_assign_pointer(clnt->cl_xprt, xprt); |
1da177e4 LT |
369 | clnt->cl_procinfo = version->procs; |
370 | clnt->cl_maxproc = version->nrprocs; | |
d5b337b4 | 371 | clnt->cl_prog = args->prognumber ? : program->number; |
1da177e4 | 372 | clnt->cl_vers = version->number; |
1da177e4 | 373 | clnt->cl_stats = program->stats; |
11c556b3 | 374 | clnt->cl_metrics = rpc_alloc_iostats(clnt); |
6739ffb7 | 375 | rpc_init_pipe_dir_head(&clnt->cl_pipedir_objects); |
23bf85ba TM |
376 | err = -ENOMEM; |
377 | if (clnt->cl_metrics == NULL) | |
378 | goto out_no_stats; | |
3e32a5d9 | 379 | clnt->cl_program = program; |
6529eba0 | 380 | INIT_LIST_HEAD(&clnt->cl_tasks); |
4bef61ff | 381 | spin_lock_init(&clnt->cl_lock); |
1da177e4 | 382 | |
2446ab60 | 383 | if (!xprt_bound(xprt)) |
1da177e4 LT |
384 | clnt->cl_autobind = 1; |
385 | ||
ba7392bb TM |
386 | clnt->cl_timeout = xprt->timeout; |
387 | if (args->timeout != NULL) { | |
388 | memcpy(&clnt->cl_timeout_default, args->timeout, | |
389 | sizeof(clnt->cl_timeout_default)); | |
390 | clnt->cl_timeout = &clnt->cl_timeout_default; | |
391 | } | |
392 | ||
1da177e4 | 393 | clnt->cl_rtt = &clnt->cl_rtt_default; |
ba7392bb | 394 | rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval); |
1da177e4 | 395 | |
006abe88 | 396 | atomic_set(&clnt->cl_count, 1); |
34f52e35 | 397 | |
1da177e4 | 398 | /* save the nodename */ |
cbbb3449 | 399 | rpc_clnt_set_nodename(clnt, utsname()->nodename); |
e73f4cc0 SK |
400 | |
401 | err = rpc_client_register(args, clnt); | |
402 | if (err) | |
403 | goto out_no_path; | |
280ebcf9 TM |
404 | if (parent) |
405 | atomic_inc(&parent->cl_count); | |
1da177e4 LT |
406 | return clnt; |
407 | ||
1da177e4 | 408 | out_no_path: |
23bf85ba TM |
409 | rpc_free_iostats(clnt->cl_metrics); |
410 | out_no_stats: | |
2f048db4 TM |
411 | rpc_free_clid(clnt); |
412 | out_no_clid: | |
1da177e4 LT |
413 | kfree(clnt); |
414 | out_err: | |
4ada539e TM |
415 | rpciod_down(); |
416 | out_no_rpciod: | |
f05c124a | 417 | xprt_put(xprt); |
1da177e4 LT |
418 | return ERR_PTR(err); |
419 | } | |
420 | ||
2c53040f | 421 | /** |
c2866763 CL |
422 | * rpc_create - create an RPC client and transport with one call |
423 | * @args: rpc_clnt create argument structure | |
424 | * | |
425 | * Creates and initializes an RPC transport and an RPC client. | |
426 | * | |
427 | * It can ping the server in order to determine if it is up, and to see if | |
428 | * it supports this program and version. RPC_CLNT_CREATE_NOPING disables | |
429 | * this behavior so asynchronous tasks can also use rpc_create. | |
430 | */ | |
431 | struct rpc_clnt *rpc_create(struct rpc_create_args *args) | |
432 | { | |
433 | struct rpc_xprt *xprt; | |
434 | struct rpc_clnt *clnt; | |
3c341b0b | 435 | struct xprt_create xprtargs = { |
9a23e332 | 436 | .net = args->net, |
4fa016eb | 437 | .ident = args->protocol, |
d3bc9a1d | 438 | .srcaddr = args->saddress, |
96802a09 FM |
439 | .dstaddr = args->address, |
440 | .addrlen = args->addrsize, | |
4e0038b6 | 441 | .servername = args->servername, |
f300baba | 442 | .bc_xprt = args->bc_xprt, |
96802a09 | 443 | }; |
510deb0d | 444 | char servername[48]; |
c2866763 | 445 | |
b7993ceb TM |
446 | if (args->flags & RPC_CLNT_CREATE_INFINITE_SLOTS) |
447 | xprtargs.flags |= XPRT_CREATE_INFINITE_SLOTS; | |
33d90ac0 BF |
448 | if (args->flags & RPC_CLNT_CREATE_NO_IDLE_TIMEOUT) |
449 | xprtargs.flags |= XPRT_CREATE_NO_IDLE_TIMEOUT; | |
43780b87 CL |
450 | /* |
451 | * If the caller chooses not to specify a hostname, whip | |
452 | * up a string representation of the passed-in address. | |
453 | */ | |
4e0038b6 | 454 | if (xprtargs.servername == NULL) { |
176e21ee CL |
455 | struct sockaddr_un *sun = |
456 | (struct sockaddr_un *)args->address; | |
da09eb93 CL |
457 | struct sockaddr_in *sin = |
458 | (struct sockaddr_in *)args->address; | |
459 | struct sockaddr_in6 *sin6 = | |
460 | (struct sockaddr_in6 *)args->address; | |
461 | ||
510deb0d CL |
462 | servername[0] = '\0'; |
463 | switch (args->address->sa_family) { | |
176e21ee CL |
464 | case AF_LOCAL: |
465 | snprintf(servername, sizeof(servername), "%s", | |
466 | sun->sun_path); | |
467 | break; | |
da09eb93 | 468 | case AF_INET: |
21454aaa HH |
469 | snprintf(servername, sizeof(servername), "%pI4", |
470 | &sin->sin_addr.s_addr); | |
510deb0d | 471 | break; |
da09eb93 | 472 | case AF_INET6: |
5b095d98 | 473 | snprintf(servername, sizeof(servername), "%pI6", |
da09eb93 | 474 | &sin6->sin6_addr); |
510deb0d | 475 | break; |
510deb0d CL |
476 | default: |
477 | /* caller wants default server name, but | |
478 | * address family isn't recognized. */ | |
479 | return ERR_PTR(-EINVAL); | |
480 | } | |
4e0038b6 | 481 | xprtargs.servername = servername; |
43780b87 CL |
482 | } |
483 | ||
510deb0d CL |
484 | xprt = xprt_create_transport(&xprtargs); |
485 | if (IS_ERR(xprt)) | |
486 | return (struct rpc_clnt *)xprt; | |
487 | ||
c2866763 CL |
488 | /* |
489 | * By default, kernel RPC client connects from a reserved port. | |
490 | * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters, | |
491 | * but it is always enabled for rpciod, which handles the connect | |
492 | * operation. | |
493 | */ | |
494 | xprt->resvport = 1; | |
495 | if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT) | |
496 | xprt->resvport = 0; | |
497 | ||
280ebcf9 | 498 | clnt = rpc_new_client(args, xprt, NULL); |
c2866763 CL |
499 | if (IS_ERR(clnt)) |
500 | return clnt; | |
501 | ||
502 | if (!(args->flags & RPC_CLNT_CREATE_NOPING)) { | |
caabea8a | 503 | int err = rpc_ping(clnt); |
c2866763 CL |
504 | if (err != 0) { |
505 | rpc_shutdown_client(clnt); | |
506 | return ERR_PTR(err); | |
507 | } | |
508 | } | |
509 | ||
510 | clnt->cl_softrtry = 1; | |
511 | if (args->flags & RPC_CLNT_CREATE_HARDRTRY) | |
512 | clnt->cl_softrtry = 0; | |
513 | ||
c2866763 CL |
514 | if (args->flags & RPC_CLNT_CREATE_AUTOBIND) |
515 | clnt->cl_autobind = 1; | |
43d78ef2 CL |
516 | if (args->flags & RPC_CLNT_CREATE_DISCRTRY) |
517 | clnt->cl_discrtry = 1; | |
b6b6152c OK |
518 | if (!(args->flags & RPC_CLNT_CREATE_QUIET)) |
519 | clnt->cl_chatty = 1; | |
c2866763 CL |
520 | |
521 | return clnt; | |
522 | } | |
b86acd50 | 523 | EXPORT_SYMBOL_GPL(rpc_create); |
c2866763 | 524 | |
1da177e4 LT |
525 | /* |
526 | * This function clones the RPC client structure. It allows us to share the | |
527 | * same transport while varying parameters such as the authentication | |
528 | * flavour. | |
529 | */ | |
1b63a751 CL |
530 | static struct rpc_clnt *__rpc_clone_client(struct rpc_create_args *args, |
531 | struct rpc_clnt *clnt) | |
1da177e4 | 532 | { |
2446ab60 | 533 | struct rpc_xprt *xprt; |
1b63a751 CL |
534 | struct rpc_clnt *new; |
535 | int err; | |
1da177e4 | 536 | |
1b63a751 | 537 | err = -ENOMEM; |
2446ab60 TM |
538 | rcu_read_lock(); |
539 | xprt = xprt_get(rcu_dereference(clnt->cl_xprt)); | |
540 | rcu_read_unlock(); | |
541 | if (xprt == NULL) | |
1b63a751 CL |
542 | goto out_err; |
543 | args->servername = xprt->servername; | |
544 | ||
280ebcf9 | 545 | new = rpc_new_client(args, xprt, clnt); |
1b63a751 CL |
546 | if (IS_ERR(new)) { |
547 | err = PTR_ERR(new); | |
a58e0be6 | 548 | goto out_err; |
1b63a751 CL |
549 | } |
550 | ||
1b63a751 CL |
551 | /* Turn off autobind on clones */ |
552 | new->cl_autobind = 0; | |
553 | new->cl_softrtry = clnt->cl_softrtry; | |
554 | new->cl_discrtry = clnt->cl_discrtry; | |
555 | new->cl_chatty = clnt->cl_chatty; | |
1da177e4 | 556 | return new; |
1b63a751 | 557 | |
1b63a751 | 558 | out_err: |
0dc47877 | 559 | dprintk("RPC: %s: returned error %d\n", __func__, err); |
3e32a5d9 | 560 | return ERR_PTR(err); |
1da177e4 | 561 | } |
1b63a751 CL |
562 | |
563 | /** | |
564 | * rpc_clone_client - Clone an RPC client structure | |
565 | * | |
566 | * @clnt: RPC client whose parameters are copied | |
567 | * | |
568 | * Returns a fresh RPC client or an ERR_PTR. | |
569 | */ | |
570 | struct rpc_clnt *rpc_clone_client(struct rpc_clnt *clnt) | |
571 | { | |
572 | struct rpc_create_args args = { | |
573 | .program = clnt->cl_program, | |
574 | .prognumber = clnt->cl_prog, | |
575 | .version = clnt->cl_vers, | |
576 | .authflavor = clnt->cl_auth->au_flavor, | |
1b63a751 CL |
577 | }; |
578 | return __rpc_clone_client(&args, clnt); | |
579 | } | |
e8914c65 | 580 | EXPORT_SYMBOL_GPL(rpc_clone_client); |
1da177e4 | 581 | |
ba9b584c CL |
582 | /** |
583 | * rpc_clone_client_set_auth - Clone an RPC client structure and set its auth | |
584 | * | |
585 | * @clnt: RPC client whose parameters are copied | |
7144bca6 | 586 | * @flavor: security flavor for new client |
ba9b584c CL |
587 | * |
588 | * Returns a fresh RPC client or an ERR_PTR. | |
589 | */ | |
590 | struct rpc_clnt * | |
591 | rpc_clone_client_set_auth(struct rpc_clnt *clnt, rpc_authflavor_t flavor) | |
592 | { | |
593 | struct rpc_create_args args = { | |
594 | .program = clnt->cl_program, | |
595 | .prognumber = clnt->cl_prog, | |
596 | .version = clnt->cl_vers, | |
597 | .authflavor = flavor, | |
ba9b584c CL |
598 | }; |
599 | return __rpc_clone_client(&args, clnt); | |
600 | } | |
601 | EXPORT_SYMBOL_GPL(rpc_clone_client_set_auth); | |
602 | ||
58f9612c TM |
603 | /* |
604 | * Kill all tasks for the given client. | |
605 | * XXX: kill their descendants as well? | |
606 | */ | |
607 | void rpc_killall_tasks(struct rpc_clnt *clnt) | |
608 | { | |
609 | struct rpc_task *rovr; | |
610 | ||
611 | ||
612 | if (list_empty(&clnt->cl_tasks)) | |
613 | return; | |
614 | dprintk("RPC: killing all tasks for client %p\n", clnt); | |
615 | /* | |
616 | * Spin lock all_tasks to prevent changes... | |
617 | */ | |
618 | spin_lock(&clnt->cl_lock); | |
619 | list_for_each_entry(rovr, &clnt->cl_tasks, tk_task) { | |
620 | if (!RPC_IS_ACTIVATED(rovr)) | |
621 | continue; | |
622 | if (!(rovr->tk_flags & RPC_TASK_KILLED)) { | |
623 | rovr->tk_flags |= RPC_TASK_KILLED; | |
624 | rpc_exit(rovr, -EIO); | |
8e26de23 SK |
625 | if (RPC_IS_QUEUED(rovr)) |
626 | rpc_wake_up_queued_task(rovr->tk_waitqueue, | |
627 | rovr); | |
58f9612c TM |
628 | } |
629 | } | |
630 | spin_unlock(&clnt->cl_lock); | |
631 | } | |
632 | EXPORT_SYMBOL_GPL(rpc_killall_tasks); | |
633 | ||
1da177e4 LT |
634 | /* |
635 | * Properly shut down an RPC client, terminating all outstanding | |
90c5755f | 636 | * requests. |
1da177e4 | 637 | */ |
4c402b40 | 638 | void rpc_shutdown_client(struct rpc_clnt *clnt) |
1da177e4 | 639 | { |
168e4b39 WAA |
640 | might_sleep(); |
641 | ||
4e0038b6 | 642 | dprintk_rcu("RPC: shutting down %s client for %s\n", |
55909f21 | 643 | clnt->cl_program->name, |
4e0038b6 | 644 | rcu_dereference(clnt->cl_xprt)->servername); |
1da177e4 | 645 | |
34f52e35 | 646 | while (!list_empty(&clnt->cl_tasks)) { |
1da177e4 | 647 | rpc_killall_tasks(clnt); |
532347e2 | 648 | wait_event_timeout(destroy_wait, |
34f52e35 | 649 | list_empty(&clnt->cl_tasks), 1*HZ); |
1da177e4 LT |
650 | } |
651 | ||
4c402b40 | 652 | rpc_release_client(clnt); |
1da177e4 | 653 | } |
e8914c65 | 654 | EXPORT_SYMBOL_GPL(rpc_shutdown_client); |
1da177e4 LT |
655 | |
656 | /* | |
34f52e35 | 657 | * Free an RPC client |
1da177e4 | 658 | */ |
34f52e35 | 659 | static void |
006abe88 | 660 | rpc_free_client(struct rpc_clnt *clnt) |
1da177e4 | 661 | { |
4e0038b6 | 662 | dprintk_rcu("RPC: destroying %s client for %s\n", |
55909f21 | 663 | clnt->cl_program->name, |
4e0038b6 | 664 | rcu_dereference(clnt->cl_xprt)->servername); |
6eac7d3f | 665 | if (clnt->cl_parent != clnt) |
8ad7c892 | 666 | rpc_release_client(clnt->cl_parent); |
f5131257 | 667 | rpc_clnt_remove_pipedir(clnt); |
adb6fa7f | 668 | rpc_unregister_client(clnt); |
11c556b3 CL |
669 | rpc_free_iostats(clnt->cl_metrics); |
670 | clnt->cl_metrics = NULL; | |
2446ab60 | 671 | xprt_put(rcu_dereference_raw(clnt->cl_xprt)); |
4ada539e | 672 | rpciod_down(); |
2f048db4 | 673 | rpc_free_clid(clnt); |
1da177e4 | 674 | kfree(clnt); |
1da177e4 LT |
675 | } |
676 | ||
1dd17ec6 TM |
677 | /* |
678 | * Free an RPC client | |
679 | */ | |
680 | static void | |
006abe88 | 681 | rpc_free_auth(struct rpc_clnt *clnt) |
1dd17ec6 | 682 | { |
1dd17ec6 | 683 | if (clnt->cl_auth == NULL) { |
006abe88 | 684 | rpc_free_client(clnt); |
1dd17ec6 TM |
685 | return; |
686 | } | |
687 | ||
688 | /* | |
689 | * Note: RPCSEC_GSS may need to send NULL RPC calls in order to | |
690 | * release remaining GSS contexts. This mechanism ensures | |
691 | * that it can do so safely. | |
692 | */ | |
006abe88 | 693 | atomic_inc(&clnt->cl_count); |
1dd17ec6 TM |
694 | rpcauth_release(clnt->cl_auth); |
695 | clnt->cl_auth = NULL; | |
006abe88 TM |
696 | if (atomic_dec_and_test(&clnt->cl_count)) |
697 | rpc_free_client(clnt); | |
1dd17ec6 TM |
698 | } |
699 | ||
1da177e4 | 700 | /* |
34f52e35 | 701 | * Release reference to the RPC client |
1da177e4 LT |
702 | */ |
703 | void | |
704 | rpc_release_client(struct rpc_clnt *clnt) | |
705 | { | |
34f52e35 | 706 | dprintk("RPC: rpc_release_client(%p)\n", clnt); |
1da177e4 | 707 | |
34f52e35 TM |
708 | if (list_empty(&clnt->cl_tasks)) |
709 | wake_up(&destroy_wait); | |
006abe88 TM |
710 | if (atomic_dec_and_test(&clnt->cl_count)) |
711 | rpc_free_auth(clnt); | |
34f52e35 | 712 | } |
1d658336 | 713 | EXPORT_SYMBOL_GPL(rpc_release_client); |
34f52e35 | 714 | |
007e251f AG |
715 | /** |
716 | * rpc_bind_new_program - bind a new RPC program to an existing client | |
65b6e42c RD |
717 | * @old: old rpc_client |
718 | * @program: rpc program to set | |
719 | * @vers: rpc program version | |
007e251f AG |
720 | * |
721 | * Clones the rpc client and sets up a new RPC program. This is mainly | |
722 | * of use for enabling different RPC programs to share the same transport. | |
723 | * The Sun NFSv2/v3 ACL protocol can do this. | |
724 | */ | |
725 | struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old, | |
a613fa16 | 726 | const struct rpc_program *program, |
89eb21c3 | 727 | u32 vers) |
007e251f | 728 | { |
f994c43d TM |
729 | struct rpc_create_args args = { |
730 | .program = program, | |
731 | .prognumber = program->number, | |
732 | .version = vers, | |
733 | .authflavor = old->cl_auth->au_flavor, | |
f994c43d | 734 | }; |
007e251f | 735 | struct rpc_clnt *clnt; |
007e251f AG |
736 | int err; |
737 | ||
f994c43d | 738 | clnt = __rpc_clone_client(&args, old); |
007e251f AG |
739 | if (IS_ERR(clnt)) |
740 | goto out; | |
caabea8a | 741 | err = rpc_ping(clnt); |
007e251f AG |
742 | if (err != 0) { |
743 | rpc_shutdown_client(clnt); | |
744 | clnt = ERR_PTR(err); | |
745 | } | |
cca5172a | 746 | out: |
007e251f AG |
747 | return clnt; |
748 | } | |
e8914c65 | 749 | EXPORT_SYMBOL_GPL(rpc_bind_new_program); |
007e251f | 750 | |
58f9612c TM |
751 | void rpc_task_release_client(struct rpc_task *task) |
752 | { | |
753 | struct rpc_clnt *clnt = task->tk_client; | |
754 | ||
755 | if (clnt != NULL) { | |
756 | /* Remove from client task list */ | |
757 | spin_lock(&clnt->cl_lock); | |
758 | list_del(&task->tk_task); | |
759 | spin_unlock(&clnt->cl_lock); | |
760 | task->tk_client = NULL; | |
761 | ||
762 | rpc_release_client(clnt); | |
763 | } | |
764 | } | |
765 | ||
766 | static | |
767 | void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt) | |
768 | { | |
769 | if (clnt != NULL) { | |
770 | rpc_task_release_client(task); | |
771 | task->tk_client = clnt; | |
006abe88 | 772 | atomic_inc(&clnt->cl_count); |
58f9612c TM |
773 | if (clnt->cl_softrtry) |
774 | task->tk_flags |= RPC_TASK_SOFT; | |
a564b8f0 MG |
775 | if (sk_memalloc_socks()) { |
776 | struct rpc_xprt *xprt; | |
777 | ||
778 | rcu_read_lock(); | |
779 | xprt = rcu_dereference(clnt->cl_xprt); | |
780 | if (xprt->swapper) | |
781 | task->tk_flags |= RPC_TASK_SWAPPER; | |
782 | rcu_read_unlock(); | |
783 | } | |
58f9612c TM |
784 | /* Add to the client's list of all tasks */ |
785 | spin_lock(&clnt->cl_lock); | |
786 | list_add_tail(&task->tk_task, &clnt->cl_tasks); | |
787 | spin_unlock(&clnt->cl_lock); | |
788 | } | |
789 | } | |
790 | ||
cbdabc7f AA |
791 | void rpc_task_reset_client(struct rpc_task *task, struct rpc_clnt *clnt) |
792 | { | |
793 | rpc_task_release_client(task); | |
794 | rpc_task_set_client(task, clnt); | |
795 | } | |
796 | EXPORT_SYMBOL_GPL(rpc_task_reset_client); | |
797 | ||
798 | ||
58f9612c TM |
799 | static void |
800 | rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg) | |
801 | { | |
802 | if (msg != NULL) { | |
803 | task->tk_msg.rpc_proc = msg->rpc_proc; | |
804 | task->tk_msg.rpc_argp = msg->rpc_argp; | |
805 | task->tk_msg.rpc_resp = msg->rpc_resp; | |
a17c2153 TM |
806 | if (msg->rpc_cred != NULL) |
807 | task->tk_msg.rpc_cred = get_rpccred(msg->rpc_cred); | |
58f9612c TM |
808 | } |
809 | } | |
810 | ||
1da177e4 LT |
811 | /* |
812 | * Default callback for async RPC calls | |
813 | */ | |
814 | static void | |
963d8fe5 | 815 | rpc_default_callback(struct rpc_task *task, void *data) |
1da177e4 LT |
816 | { |
817 | } | |
818 | ||
963d8fe5 TM |
819 | static const struct rpc_call_ops rpc_default_ops = { |
820 | .rpc_call_done = rpc_default_callback, | |
821 | }; | |
822 | ||
c970aa85 TM |
823 | /** |
824 | * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it | |
825 | * @task_setup_data: pointer to task initialisation data | |
826 | */ | |
827 | struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data) | |
6e5b70e9 | 828 | { |
19445b99 | 829 | struct rpc_task *task; |
6e5b70e9 | 830 | |
84115e1c | 831 | task = rpc_new_task(task_setup_data); |
19445b99 | 832 | if (IS_ERR(task)) |
50859259 | 833 | goto out; |
6e5b70e9 | 834 | |
58f9612c TM |
835 | rpc_task_set_client(task, task_setup_data->rpc_client); |
836 | rpc_task_set_rpc_message(task, task_setup_data->rpc_message); | |
837 | ||
58f9612c TM |
838 | if (task->tk_action == NULL) |
839 | rpc_call_start(task); | |
840 | ||
6e5b70e9 TM |
841 | atomic_inc(&task->tk_count); |
842 | rpc_execute(task); | |
6e5b70e9 | 843 | out: |
19445b99 | 844 | return task; |
6e5b70e9 | 845 | } |
c970aa85 | 846 | EXPORT_SYMBOL_GPL(rpc_run_task); |
6e5b70e9 TM |
847 | |
848 | /** | |
849 | * rpc_call_sync - Perform a synchronous RPC call | |
850 | * @clnt: pointer to RPC client | |
851 | * @msg: RPC call parameters | |
852 | * @flags: RPC call flags | |
1da177e4 | 853 | */ |
cbc20059 | 854 | int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags) |
1da177e4 LT |
855 | { |
856 | struct rpc_task *task; | |
84115e1c TM |
857 | struct rpc_task_setup task_setup_data = { |
858 | .rpc_client = clnt, | |
859 | .rpc_message = msg, | |
860 | .callback_ops = &rpc_default_ops, | |
861 | .flags = flags, | |
862 | }; | |
6e5b70e9 | 863 | int status; |
1da177e4 | 864 | |
50d2bdb1 WAA |
865 | WARN_ON_ONCE(flags & RPC_TASK_ASYNC); |
866 | if (flags & RPC_TASK_ASYNC) { | |
867 | rpc_release_calldata(task_setup_data.callback_ops, | |
868 | task_setup_data.callback_data); | |
869 | return -EINVAL; | |
870 | } | |
1da177e4 | 871 | |
c970aa85 | 872 | task = rpc_run_task(&task_setup_data); |
6e5b70e9 TM |
873 | if (IS_ERR(task)) |
874 | return PTR_ERR(task); | |
e60859ac | 875 | status = task->tk_status; |
bde8f00c | 876 | rpc_put_task(task); |
1da177e4 LT |
877 | return status; |
878 | } | |
e8914c65 | 879 | EXPORT_SYMBOL_GPL(rpc_call_sync); |
1da177e4 | 880 | |
6e5b70e9 TM |
881 | /** |
882 | * rpc_call_async - Perform an asynchronous RPC call | |
883 | * @clnt: pointer to RPC client | |
884 | * @msg: RPC call parameters | |
885 | * @flags: RPC call flags | |
65b6e42c | 886 | * @tk_ops: RPC call ops |
6e5b70e9 | 887 | * @data: user call data |
1da177e4 LT |
888 | */ |
889 | int | |
cbc20059 | 890 | rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags, |
963d8fe5 | 891 | const struct rpc_call_ops *tk_ops, void *data) |
1da177e4 LT |
892 | { |
893 | struct rpc_task *task; | |
84115e1c TM |
894 | struct rpc_task_setup task_setup_data = { |
895 | .rpc_client = clnt, | |
896 | .rpc_message = msg, | |
897 | .callback_ops = tk_ops, | |
898 | .callback_data = data, | |
899 | .flags = flags|RPC_TASK_ASYNC, | |
900 | }; | |
1da177e4 | 901 | |
c970aa85 | 902 | task = rpc_run_task(&task_setup_data); |
6e5b70e9 TM |
903 | if (IS_ERR(task)) |
904 | return PTR_ERR(task); | |
905 | rpc_put_task(task); | |
906 | return 0; | |
1da177e4 | 907 | } |
e8914c65 | 908 | EXPORT_SYMBOL_GPL(rpc_call_async); |
1da177e4 | 909 | |
9e00abc3 | 910 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
55ae1aab RL |
911 | /** |
912 | * rpc_run_bc_task - Allocate a new RPC task for backchannel use, then run | |
913 | * rpc_execute against it | |
7a73fdde JSR |
914 | * @req: RPC request |
915 | * @tk_ops: RPC call ops | |
55ae1aab RL |
916 | */ |
917 | struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req, | |
7a73fdde | 918 | const struct rpc_call_ops *tk_ops) |
55ae1aab RL |
919 | { |
920 | struct rpc_task *task; | |
921 | struct xdr_buf *xbufp = &req->rq_snd_buf; | |
922 | struct rpc_task_setup task_setup_data = { | |
923 | .callback_ops = tk_ops, | |
924 | }; | |
925 | ||
926 | dprintk("RPC: rpc_run_bc_task req= %p\n", req); | |
927 | /* | |
928 | * Create an rpc_task to send the data | |
929 | */ | |
930 | task = rpc_new_task(&task_setup_data); | |
19445b99 | 931 | if (IS_ERR(task)) { |
55ae1aab RL |
932 | xprt_free_bc_request(req); |
933 | goto out; | |
934 | } | |
935 | task->tk_rqstp = req; | |
936 | ||
937 | /* | |
938 | * Set up the xdr_buf length. | |
939 | * This also indicates that the buffer is XDR encoded already. | |
940 | */ | |
941 | xbufp->len = xbufp->head[0].iov_len + xbufp->page_len + | |
942 | xbufp->tail[0].iov_len; | |
943 | ||
944 | task->tk_action = call_bc_transmit; | |
945 | atomic_inc(&task->tk_count); | |
9a6478f6 | 946 | WARN_ON_ONCE(atomic_read(&task->tk_count) != 2); |
55ae1aab RL |
947 | rpc_execute(task); |
948 | ||
949 | out: | |
950 | dprintk("RPC: rpc_run_bc_task: task= %p\n", task); | |
951 | return task; | |
952 | } | |
9e00abc3 | 953 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
55ae1aab | 954 | |
77de2c59 TM |
955 | void |
956 | rpc_call_start(struct rpc_task *task) | |
957 | { | |
958 | task->tk_action = call_start; | |
959 | } | |
960 | EXPORT_SYMBOL_GPL(rpc_call_start); | |
961 | ||
ed39440a CL |
962 | /** |
963 | * rpc_peeraddr - extract remote peer address from clnt's xprt | |
964 | * @clnt: RPC client structure | |
965 | * @buf: target buffer | |
65b6e42c | 966 | * @bufsize: length of target buffer |
ed39440a CL |
967 | * |
968 | * Returns the number of bytes that are actually in the stored address. | |
969 | */ | |
970 | size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize) | |
971 | { | |
972 | size_t bytes; | |
2446ab60 TM |
973 | struct rpc_xprt *xprt; |
974 | ||
975 | rcu_read_lock(); | |
976 | xprt = rcu_dereference(clnt->cl_xprt); | |
ed39440a | 977 | |
2446ab60 | 978 | bytes = xprt->addrlen; |
ed39440a CL |
979 | if (bytes > bufsize) |
980 | bytes = bufsize; | |
2446ab60 TM |
981 | memcpy(buf, &xprt->addr, bytes); |
982 | rcu_read_unlock(); | |
983 | ||
984 | return bytes; | |
ed39440a | 985 | } |
b86acd50 | 986 | EXPORT_SYMBOL_GPL(rpc_peeraddr); |
ed39440a | 987 | |
f425eba4 CL |
988 | /** |
989 | * rpc_peeraddr2str - return remote peer address in printable format | |
990 | * @clnt: RPC client structure | |
991 | * @format: address format | |
992 | * | |
2446ab60 TM |
993 | * NB: the lifetime of the memory referenced by the returned pointer is |
994 | * the same as the rpc_xprt itself. As long as the caller uses this | |
995 | * pointer, it must hold the RCU read lock. | |
f425eba4 | 996 | */ |
b454ae90 CL |
997 | const char *rpc_peeraddr2str(struct rpc_clnt *clnt, |
998 | enum rpc_display_format_t format) | |
f425eba4 | 999 | { |
2446ab60 TM |
1000 | struct rpc_xprt *xprt; |
1001 | ||
1002 | xprt = rcu_dereference(clnt->cl_xprt); | |
7559c7a2 CL |
1003 | |
1004 | if (xprt->address_strings[format] != NULL) | |
1005 | return xprt->address_strings[format]; | |
1006 | else | |
1007 | return "unprintable"; | |
f425eba4 | 1008 | } |
b86acd50 | 1009 | EXPORT_SYMBOL_GPL(rpc_peeraddr2str); |
f425eba4 | 1010 | |
2e738fdc CL |
1011 | static const struct sockaddr_in rpc_inaddr_loopback = { |
1012 | .sin_family = AF_INET, | |
1013 | .sin_addr.s_addr = htonl(INADDR_ANY), | |
1014 | }; | |
1015 | ||
1016 | static const struct sockaddr_in6 rpc_in6addr_loopback = { | |
1017 | .sin6_family = AF_INET6, | |
1018 | .sin6_addr = IN6ADDR_ANY_INIT, | |
1019 | }; | |
1020 | ||
1021 | /* | |
1022 | * Try a getsockname() on a connected datagram socket. Using a | |
1023 | * connected datagram socket prevents leaving a socket in TIME_WAIT. | |
1024 | * This conserves the ephemeral port number space. | |
1025 | * | |
1026 | * Returns zero and fills in "buf" if successful; otherwise, a | |
1027 | * negative errno is returned. | |
1028 | */ | |
1029 | static int rpc_sockname(struct net *net, struct sockaddr *sap, size_t salen, | |
1030 | struct sockaddr *buf, int buflen) | |
1031 | { | |
1032 | struct socket *sock; | |
1033 | int err; | |
1034 | ||
1035 | err = __sock_create(net, sap->sa_family, | |
1036 | SOCK_DGRAM, IPPROTO_UDP, &sock, 1); | |
1037 | if (err < 0) { | |
1038 | dprintk("RPC: can't create UDP socket (%d)\n", err); | |
1039 | goto out; | |
1040 | } | |
1041 | ||
1042 | switch (sap->sa_family) { | |
1043 | case AF_INET: | |
1044 | err = kernel_bind(sock, | |
1045 | (struct sockaddr *)&rpc_inaddr_loopback, | |
1046 | sizeof(rpc_inaddr_loopback)); | |
1047 | break; | |
1048 | case AF_INET6: | |
1049 | err = kernel_bind(sock, | |
1050 | (struct sockaddr *)&rpc_in6addr_loopback, | |
1051 | sizeof(rpc_in6addr_loopback)); | |
1052 | break; | |
1053 | default: | |
1054 | err = -EAFNOSUPPORT; | |
1055 | goto out; | |
1056 | } | |
1057 | if (err < 0) { | |
1058 | dprintk("RPC: can't bind UDP socket (%d)\n", err); | |
1059 | goto out_release; | |
1060 | } | |
1061 | ||
1062 | err = kernel_connect(sock, sap, salen, 0); | |
1063 | if (err < 0) { | |
1064 | dprintk("RPC: can't connect UDP socket (%d)\n", err); | |
1065 | goto out_release; | |
1066 | } | |
1067 | ||
1068 | err = kernel_getsockname(sock, buf, &buflen); | |
1069 | if (err < 0) { | |
1070 | dprintk("RPC: getsockname failed (%d)\n", err); | |
1071 | goto out_release; | |
1072 | } | |
1073 | ||
1074 | err = 0; | |
1075 | if (buf->sa_family == AF_INET6) { | |
1076 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)buf; | |
1077 | sin6->sin6_scope_id = 0; | |
1078 | } | |
1079 | dprintk("RPC: %s succeeded\n", __func__); | |
1080 | ||
1081 | out_release: | |
1082 | sock_release(sock); | |
1083 | out: | |
1084 | return err; | |
1085 | } | |
1086 | ||
1087 | /* | |
1088 | * Scraping a connected socket failed, so we don't have a useable | |
1089 | * local address. Fallback: generate an address that will prevent | |
1090 | * the server from calling us back. | |
1091 | * | |
1092 | * Returns zero and fills in "buf" if successful; otherwise, a | |
1093 | * negative errno is returned. | |
1094 | */ | |
1095 | static int rpc_anyaddr(int family, struct sockaddr *buf, size_t buflen) | |
1096 | { | |
1097 | switch (family) { | |
1098 | case AF_INET: | |
1099 | if (buflen < sizeof(rpc_inaddr_loopback)) | |
1100 | return -EINVAL; | |
1101 | memcpy(buf, &rpc_inaddr_loopback, | |
1102 | sizeof(rpc_inaddr_loopback)); | |
1103 | break; | |
1104 | case AF_INET6: | |
1105 | if (buflen < sizeof(rpc_in6addr_loopback)) | |
1106 | return -EINVAL; | |
1107 | memcpy(buf, &rpc_in6addr_loopback, | |
1108 | sizeof(rpc_in6addr_loopback)); | |
1109 | default: | |
1110 | dprintk("RPC: %s: address family not supported\n", | |
1111 | __func__); | |
1112 | return -EAFNOSUPPORT; | |
1113 | } | |
1114 | dprintk("RPC: %s: succeeded\n", __func__); | |
1115 | return 0; | |
1116 | } | |
1117 | ||
1118 | /** | |
1119 | * rpc_localaddr - discover local endpoint address for an RPC client | |
1120 | * @clnt: RPC client structure | |
1121 | * @buf: target buffer | |
1122 | * @buflen: size of target buffer, in bytes | |
1123 | * | |
1124 | * Returns zero and fills in "buf" and "buflen" if successful; | |
1125 | * otherwise, a negative errno is returned. | |
1126 | * | |
1127 | * This works even if the underlying transport is not currently connected, | |
1128 | * or if the upper layer never previously provided a source address. | |
1129 | * | |
1130 | * The result of this function call is transient: multiple calls in | |
1131 | * succession may give different results, depending on how local | |
1132 | * networking configuration changes over time. | |
1133 | */ | |
1134 | int rpc_localaddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t buflen) | |
1135 | { | |
1136 | struct sockaddr_storage address; | |
1137 | struct sockaddr *sap = (struct sockaddr *)&address; | |
1138 | struct rpc_xprt *xprt; | |
1139 | struct net *net; | |
1140 | size_t salen; | |
1141 | int err; | |
1142 | ||
1143 | rcu_read_lock(); | |
1144 | xprt = rcu_dereference(clnt->cl_xprt); | |
1145 | salen = xprt->addrlen; | |
1146 | memcpy(sap, &xprt->addr, salen); | |
1147 | net = get_net(xprt->xprt_net); | |
1148 | rcu_read_unlock(); | |
1149 | ||
1150 | rpc_set_port(sap, 0); | |
1151 | err = rpc_sockname(net, sap, salen, buf, buflen); | |
1152 | put_net(net); | |
1153 | if (err != 0) | |
1154 | /* Couldn't discover local address, return ANYADDR */ | |
1155 | return rpc_anyaddr(sap->sa_family, buf, buflen); | |
1156 | return 0; | |
1157 | } | |
1158 | EXPORT_SYMBOL_GPL(rpc_localaddr); | |
1159 | ||
1da177e4 LT |
1160 | void |
1161 | rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize) | |
1162 | { | |
2446ab60 TM |
1163 | struct rpc_xprt *xprt; |
1164 | ||
1165 | rcu_read_lock(); | |
1166 | xprt = rcu_dereference(clnt->cl_xprt); | |
470056c2 CL |
1167 | if (xprt->ops->set_buffer_size) |
1168 | xprt->ops->set_buffer_size(xprt, sndsize, rcvsize); | |
2446ab60 | 1169 | rcu_read_unlock(); |
1da177e4 | 1170 | } |
e8914c65 | 1171 | EXPORT_SYMBOL_GPL(rpc_setbufsize); |
1da177e4 | 1172 | |
2446ab60 TM |
1173 | /** |
1174 | * rpc_protocol - Get transport protocol number for an RPC client | |
1175 | * @clnt: RPC client to query | |
1176 | * | |
1177 | */ | |
1178 | int rpc_protocol(struct rpc_clnt *clnt) | |
1179 | { | |
1180 | int protocol; | |
1181 | ||
1182 | rcu_read_lock(); | |
1183 | protocol = rcu_dereference(clnt->cl_xprt)->prot; | |
1184 | rcu_read_unlock(); | |
1185 | return protocol; | |
1186 | } | |
1187 | EXPORT_SYMBOL_GPL(rpc_protocol); | |
1188 | ||
1189 | /** | |
1190 | * rpc_net_ns - Get the network namespace for this RPC client | |
1191 | * @clnt: RPC client to query | |
1192 | * | |
1193 | */ | |
1194 | struct net *rpc_net_ns(struct rpc_clnt *clnt) | |
1195 | { | |
1196 | struct net *ret; | |
1197 | ||
1198 | rcu_read_lock(); | |
1199 | ret = rcu_dereference(clnt->cl_xprt)->xprt_net; | |
1200 | rcu_read_unlock(); | |
1201 | return ret; | |
1202 | } | |
1203 | EXPORT_SYMBOL_GPL(rpc_net_ns); | |
1204 | ||
1205 | /** | |
1206 | * rpc_max_payload - Get maximum payload size for a transport, in bytes | |
1207 | * @clnt: RPC client to query | |
1da177e4 LT |
1208 | * |
1209 | * For stream transports, this is one RPC record fragment (see RFC | |
1210 | * 1831), as we don't support multi-record requests yet. For datagram | |
1211 | * transports, this is the size of an IP packet minus the IP, UDP, and | |
1212 | * RPC header sizes. | |
1213 | */ | |
1214 | size_t rpc_max_payload(struct rpc_clnt *clnt) | |
1215 | { | |
2446ab60 TM |
1216 | size_t ret; |
1217 | ||
1218 | rcu_read_lock(); | |
1219 | ret = rcu_dereference(clnt->cl_xprt)->max_payload; | |
1220 | rcu_read_unlock(); | |
1221 | return ret; | |
1da177e4 | 1222 | } |
b86acd50 | 1223 | EXPORT_SYMBOL_GPL(rpc_max_payload); |
1da177e4 | 1224 | |
edddbb1e | 1225 | /** |
512e4b29 | 1226 | * rpc_get_timeout - Get timeout for transport in units of HZ |
edddbb1e WAA |
1227 | * @clnt: RPC client to query |
1228 | */ | |
1229 | unsigned long rpc_get_timeout(struct rpc_clnt *clnt) | |
1230 | { | |
1231 | unsigned long ret; | |
1232 | ||
1233 | rcu_read_lock(); | |
1234 | ret = rcu_dereference(clnt->cl_xprt)->timeout->to_initval; | |
1235 | rcu_read_unlock(); | |
1236 | return ret; | |
1237 | } | |
1238 | EXPORT_SYMBOL_GPL(rpc_get_timeout); | |
1239 | ||
35f5a422 CL |
1240 | /** |
1241 | * rpc_force_rebind - force transport to check that remote port is unchanged | |
1242 | * @clnt: client to rebind | |
1243 | * | |
1244 | */ | |
1245 | void rpc_force_rebind(struct rpc_clnt *clnt) | |
1246 | { | |
2446ab60 TM |
1247 | if (clnt->cl_autobind) { |
1248 | rcu_read_lock(); | |
1249 | xprt_clear_bound(rcu_dereference(clnt->cl_xprt)); | |
1250 | rcu_read_unlock(); | |
1251 | } | |
35f5a422 | 1252 | } |
b86acd50 | 1253 | EXPORT_SYMBOL_GPL(rpc_force_rebind); |
35f5a422 | 1254 | |
aae2006e AA |
1255 | /* |
1256 | * Restart an (async) RPC call from the call_prepare state. | |
1257 | * Usually called from within the exit handler. | |
1258 | */ | |
f1f88fc7 | 1259 | int |
aae2006e AA |
1260 | rpc_restart_call_prepare(struct rpc_task *task) |
1261 | { | |
1262 | if (RPC_ASSASSINATED(task)) | |
f1f88fc7 | 1263 | return 0; |
d00c5d43 TM |
1264 | task->tk_action = call_start; |
1265 | if (task->tk_ops->rpc_call_prepare != NULL) | |
1266 | task->tk_action = rpc_prepare_task; | |
f1f88fc7 | 1267 | return 1; |
aae2006e AA |
1268 | } |
1269 | EXPORT_SYMBOL_GPL(rpc_restart_call_prepare); | |
1270 | ||
1da177e4 LT |
1271 | /* |
1272 | * Restart an (async) RPC call. Usually called from within the | |
1273 | * exit handler. | |
1274 | */ | |
f1f88fc7 | 1275 | int |
1da177e4 LT |
1276 | rpc_restart_call(struct rpc_task *task) |
1277 | { | |
1278 | if (RPC_ASSASSINATED(task)) | |
f1f88fc7 | 1279 | return 0; |
1da177e4 | 1280 | task->tk_action = call_start; |
f1f88fc7 | 1281 | return 1; |
1da177e4 | 1282 | } |
e8914c65 | 1283 | EXPORT_SYMBOL_GPL(rpc_restart_call); |
1da177e4 | 1284 | |
3748f1e4 CL |
1285 | #ifdef RPC_DEBUG |
1286 | static const char *rpc_proc_name(const struct rpc_task *task) | |
1287 | { | |
1288 | const struct rpc_procinfo *proc = task->tk_msg.rpc_proc; | |
1289 | ||
1290 | if (proc) { | |
1291 | if (proc->p_name) | |
1292 | return proc->p_name; | |
1293 | else | |
1294 | return "NULL"; | |
1295 | } else | |
1296 | return "no proc"; | |
1297 | } | |
1298 | #endif | |
1299 | ||
1da177e4 LT |
1300 | /* |
1301 | * 0. Initial state | |
1302 | * | |
1303 | * Other FSM states can be visited zero or more times, but | |
1304 | * this state is visited exactly once for each RPC. | |
1305 | */ | |
1306 | static void | |
1307 | call_start(struct rpc_task *task) | |
1308 | { | |
1309 | struct rpc_clnt *clnt = task->tk_client; | |
1310 | ||
3748f1e4 | 1311 | dprintk("RPC: %5u call_start %s%d proc %s (%s)\n", task->tk_pid, |
55909f21 | 1312 | clnt->cl_program->name, clnt->cl_vers, |
3748f1e4 | 1313 | rpc_proc_name(task), |
46121cf7 | 1314 | (RPC_IS_ASYNC(task) ? "async" : "sync")); |
1da177e4 LT |
1315 | |
1316 | /* Increment call count */ | |
1317 | task->tk_msg.rpc_proc->p_count++; | |
1318 | clnt->cl_stats->rpccnt++; | |
1319 | task->tk_action = call_reserve; | |
1320 | } | |
1321 | ||
1322 | /* | |
1323 | * 1. Reserve an RPC call slot | |
1324 | */ | |
1325 | static void | |
1326 | call_reserve(struct rpc_task *task) | |
1327 | { | |
46121cf7 | 1328 | dprint_status(task); |
1da177e4 | 1329 | |
1da177e4 LT |
1330 | task->tk_status = 0; |
1331 | task->tk_action = call_reserveresult; | |
1332 | xprt_reserve(task); | |
1333 | } | |
1334 | ||
ba60eb25 TM |
1335 | static void call_retry_reserve(struct rpc_task *task); |
1336 | ||
1da177e4 LT |
1337 | /* |
1338 | * 1b. Grok the result of xprt_reserve() | |
1339 | */ | |
1340 | static void | |
1341 | call_reserveresult(struct rpc_task *task) | |
1342 | { | |
1343 | int status = task->tk_status; | |
1344 | ||
46121cf7 | 1345 | dprint_status(task); |
1da177e4 LT |
1346 | |
1347 | /* | |
1348 | * After a call to xprt_reserve(), we must have either | |
1349 | * a request slot or else an error status. | |
1350 | */ | |
1351 | task->tk_status = 0; | |
1352 | if (status >= 0) { | |
1353 | if (task->tk_rqstp) { | |
f2d47d02 | 1354 | task->tk_action = call_refresh; |
1da177e4 LT |
1355 | return; |
1356 | } | |
1357 | ||
1358 | printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n", | |
0dc47877 | 1359 | __func__, status); |
1da177e4 LT |
1360 | rpc_exit(task, -EIO); |
1361 | return; | |
1362 | } | |
1363 | ||
1364 | /* | |
1365 | * Even though there was an error, we may have acquired | |
1366 | * a request slot somehow. Make sure not to leak it. | |
1367 | */ | |
1368 | if (task->tk_rqstp) { | |
1369 | printk(KERN_ERR "%s: status=%d, request allocated anyway\n", | |
0dc47877 | 1370 | __func__, status); |
1da177e4 LT |
1371 | xprt_release(task); |
1372 | } | |
1373 | ||
1374 | switch (status) { | |
1afeaf5c TM |
1375 | case -ENOMEM: |
1376 | rpc_delay(task, HZ >> 2); | |
1da177e4 | 1377 | case -EAGAIN: /* woken up; retry */ |
ba60eb25 | 1378 | task->tk_action = call_retry_reserve; |
1da177e4 LT |
1379 | return; |
1380 | case -EIO: /* probably a shutdown */ | |
1381 | break; | |
1382 | default: | |
1383 | printk(KERN_ERR "%s: unrecognized error %d, exiting\n", | |
0dc47877 | 1384 | __func__, status); |
1da177e4 LT |
1385 | break; |
1386 | } | |
1387 | rpc_exit(task, status); | |
1388 | } | |
1389 | ||
ba60eb25 TM |
1390 | /* |
1391 | * 1c. Retry reserving an RPC call slot | |
1392 | */ | |
1393 | static void | |
1394 | call_retry_reserve(struct rpc_task *task) | |
1395 | { | |
1396 | dprint_status(task); | |
1397 | ||
1398 | task->tk_status = 0; | |
1399 | task->tk_action = call_reserveresult; | |
1400 | xprt_retry_reserve(task); | |
1401 | } | |
1402 | ||
1da177e4 | 1403 | /* |
55576244 BF |
1404 | * 2. Bind and/or refresh the credentials |
1405 | */ | |
1406 | static void | |
1407 | call_refresh(struct rpc_task *task) | |
1408 | { | |
1409 | dprint_status(task); | |
1410 | ||
1411 | task->tk_action = call_refreshresult; | |
1412 | task->tk_status = 0; | |
1413 | task->tk_client->cl_stats->rpcauthrefresh++; | |
1414 | rpcauth_refreshcred(task); | |
1415 | } | |
1416 | ||
1417 | /* | |
1418 | * 2a. Process the results of a credential refresh | |
1419 | */ | |
1420 | static void | |
1421 | call_refreshresult(struct rpc_task *task) | |
1422 | { | |
1423 | int status = task->tk_status; | |
1424 | ||
1425 | dprint_status(task); | |
1426 | ||
1427 | task->tk_status = 0; | |
5fc43978 | 1428 | task->tk_action = call_refresh; |
55576244 | 1429 | switch (status) { |
5fc43978 TM |
1430 | case 0: |
1431 | if (rpcauth_uptodatecred(task)) | |
1432 | task->tk_action = call_allocate; | |
55576244 BF |
1433 | return; |
1434 | case -ETIMEDOUT: | |
1435 | rpc_delay(task, 3*HZ); | |
5fc43978 TM |
1436 | case -EAGAIN: |
1437 | status = -EACCES; | |
f1ff0c27 | 1438 | case -EKEYEXPIRED: |
5fc43978 TM |
1439 | if (!task->tk_cred_retry) |
1440 | break; | |
1441 | task->tk_cred_retry--; | |
1442 | dprintk("RPC: %5u %s: retry refresh creds\n", | |
1443 | task->tk_pid, __func__); | |
1444 | return; | |
55576244 | 1445 | } |
5fc43978 TM |
1446 | dprintk("RPC: %5u %s: refresh creds failed with error %d\n", |
1447 | task->tk_pid, __func__, status); | |
1448 | rpc_exit(task, status); | |
55576244 BF |
1449 | } |
1450 | ||
1451 | /* | |
1452 | * 2b. Allocate the buffer. For details, see sched.c:rpc_malloc. | |
02107148 | 1453 | * (Note: buffer memory is freed in xprt_release). |
1da177e4 LT |
1454 | */ |
1455 | static void | |
1456 | call_allocate(struct rpc_task *task) | |
1457 | { | |
f2d47d02 | 1458 | unsigned int slack = task->tk_rqstp->rq_cred->cr_auth->au_cslack; |
02107148 | 1459 | struct rpc_rqst *req = task->tk_rqstp; |
a4f0835c | 1460 | struct rpc_xprt *xprt = req->rq_xprt; |
2bea90d4 | 1461 | struct rpc_procinfo *proc = task->tk_msg.rpc_proc; |
1da177e4 | 1462 | |
46121cf7 CL |
1463 | dprint_status(task); |
1464 | ||
2bea90d4 | 1465 | task->tk_status = 0; |
f2d47d02 | 1466 | task->tk_action = call_bind; |
2bea90d4 | 1467 | |
02107148 | 1468 | if (req->rq_buffer) |
1da177e4 LT |
1469 | return; |
1470 | ||
2bea90d4 CL |
1471 | if (proc->p_proc != 0) { |
1472 | BUG_ON(proc->p_arglen == 0); | |
1473 | if (proc->p_decode != NULL) | |
1474 | BUG_ON(proc->p_replen == 0); | |
1475 | } | |
1da177e4 | 1476 | |
2bea90d4 CL |
1477 | /* |
1478 | * Calculate the size (in quads) of the RPC call | |
1479 | * and reply headers, and convert both values | |
1480 | * to byte sizes. | |
1481 | */ | |
1482 | req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen; | |
1483 | req->rq_callsize <<= 2; | |
1484 | req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen; | |
1485 | req->rq_rcvsize <<= 2; | |
1486 | ||
c5a4dd8b CL |
1487 | req->rq_buffer = xprt->ops->buf_alloc(task, |
1488 | req->rq_callsize + req->rq_rcvsize); | |
2bea90d4 | 1489 | if (req->rq_buffer != NULL) |
1da177e4 | 1490 | return; |
46121cf7 CL |
1491 | |
1492 | dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid); | |
1da177e4 | 1493 | |
5afa9133 | 1494 | if (RPC_IS_ASYNC(task) || !fatal_signal_pending(current)) { |
b6e9c713 | 1495 | task->tk_action = call_allocate; |
1da177e4 LT |
1496 | rpc_delay(task, HZ>>4); |
1497 | return; | |
1498 | } | |
1499 | ||
1500 | rpc_exit(task, -ERESTARTSYS); | |
1501 | } | |
1502 | ||
940e3318 TM |
1503 | static inline int |
1504 | rpc_task_need_encode(struct rpc_task *task) | |
1505 | { | |
1506 | return task->tk_rqstp->rq_snd_buf.len == 0; | |
1507 | } | |
1508 | ||
1509 | static inline void | |
1510 | rpc_task_force_reencode(struct rpc_task *task) | |
1511 | { | |
1512 | task->tk_rqstp->rq_snd_buf.len = 0; | |
2574cc9f | 1513 | task->tk_rqstp->rq_bytes_sent = 0; |
940e3318 TM |
1514 | } |
1515 | ||
2bea90d4 CL |
1516 | static inline void |
1517 | rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len) | |
1518 | { | |
1519 | buf->head[0].iov_base = start; | |
1520 | buf->head[0].iov_len = len; | |
1521 | buf->tail[0].iov_len = 0; | |
1522 | buf->page_len = 0; | |
4f22ccc3 | 1523 | buf->flags = 0; |
2bea90d4 CL |
1524 | buf->len = 0; |
1525 | buf->buflen = len; | |
1526 | } | |
1527 | ||
1da177e4 LT |
1528 | /* |
1529 | * 3. Encode arguments of an RPC call | |
1530 | */ | |
1531 | static void | |
b0e1c57e | 1532 | rpc_xdr_encode(struct rpc_task *task) |
1da177e4 | 1533 | { |
1da177e4 | 1534 | struct rpc_rqst *req = task->tk_rqstp; |
9f06c719 | 1535 | kxdreproc_t encode; |
d8ed029d | 1536 | __be32 *p; |
1da177e4 | 1537 | |
46121cf7 | 1538 | dprint_status(task); |
1da177e4 | 1539 | |
2bea90d4 CL |
1540 | rpc_xdr_buf_init(&req->rq_snd_buf, |
1541 | req->rq_buffer, | |
1542 | req->rq_callsize); | |
1543 | rpc_xdr_buf_init(&req->rq_rcv_buf, | |
1544 | (char *)req->rq_buffer + req->rq_callsize, | |
1545 | req->rq_rcvsize); | |
1da177e4 | 1546 | |
b0e1c57e CL |
1547 | p = rpc_encode_header(task); |
1548 | if (p == NULL) { | |
1549 | printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n"); | |
1da177e4 LT |
1550 | rpc_exit(task, -EIO); |
1551 | return; | |
1552 | } | |
b0e1c57e CL |
1553 | |
1554 | encode = task->tk_msg.rpc_proc->p_encode; | |
f3680312 BF |
1555 | if (encode == NULL) |
1556 | return; | |
1557 | ||
1558 | task->tk_status = rpcauth_wrap_req(task, encode, req, p, | |
1559 | task->tk_msg.rpc_argp); | |
1da177e4 LT |
1560 | } |
1561 | ||
1562 | /* | |
1563 | * 4. Get the server port number if not yet set | |
1564 | */ | |
1565 | static void | |
1566 | call_bind(struct rpc_task *task) | |
1567 | { | |
ad2368d6 | 1568 | struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; |
1da177e4 | 1569 | |
46121cf7 | 1570 | dprint_status(task); |
1da177e4 | 1571 | |
da351878 | 1572 | task->tk_action = call_connect; |
ec739ef0 | 1573 | if (!xprt_bound(xprt)) { |
da351878 | 1574 | task->tk_action = call_bind_status; |
ec739ef0 | 1575 | task->tk_timeout = xprt->bind_timeout; |
bbf7c1dd | 1576 | xprt->ops->rpcbind(task); |
1da177e4 LT |
1577 | } |
1578 | } | |
1579 | ||
1580 | /* | |
da351878 CL |
1581 | * 4a. Sort out bind result |
1582 | */ | |
1583 | static void | |
1584 | call_bind_status(struct rpc_task *task) | |
1585 | { | |
906462af | 1586 | int status = -EIO; |
da351878 CL |
1587 | |
1588 | if (task->tk_status >= 0) { | |
46121cf7 | 1589 | dprint_status(task); |
da351878 CL |
1590 | task->tk_status = 0; |
1591 | task->tk_action = call_connect; | |
1592 | return; | |
1593 | } | |
1594 | ||
5753cba1 | 1595 | trace_rpc_bind_status(task); |
da351878 | 1596 | switch (task->tk_status) { |
381ba74a TM |
1597 | case -ENOMEM: |
1598 | dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid); | |
1599 | rpc_delay(task, HZ >> 2); | |
2429cbf6 | 1600 | goto retry_timeout; |
da351878 | 1601 | case -EACCES: |
46121cf7 CL |
1602 | dprintk("RPC: %5u remote rpcbind: RPC program/version " |
1603 | "unavailable\n", task->tk_pid); | |
b79dc8ce CL |
1604 | /* fail immediately if this is an RPC ping */ |
1605 | if (task->tk_msg.rpc_proc->p_proc == 0) { | |
1606 | status = -EOPNOTSUPP; | |
1607 | break; | |
1608 | } | |
0b760113 TM |
1609 | if (task->tk_rebind_retry == 0) |
1610 | break; | |
1611 | task->tk_rebind_retry--; | |
ea635a51 | 1612 | rpc_delay(task, 3*HZ); |
da45828e | 1613 | goto retry_timeout; |
da351878 | 1614 | case -ETIMEDOUT: |
46121cf7 | 1615 | dprintk("RPC: %5u rpcbind request timed out\n", |
da351878 | 1616 | task->tk_pid); |
da45828e | 1617 | goto retry_timeout; |
da351878 | 1618 | case -EPFNOSUPPORT: |
906462af | 1619 | /* server doesn't support any rpcbind version we know of */ |
012da158 | 1620 | dprintk("RPC: %5u unrecognized remote rpcbind service\n", |
da351878 CL |
1621 | task->tk_pid); |
1622 | break; | |
1623 | case -EPROTONOSUPPORT: | |
00a6e7bb | 1624 | dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n", |
da351878 | 1625 | task->tk_pid); |
00a6e7bb CL |
1626 | task->tk_status = 0; |
1627 | task->tk_action = call_bind; | |
1628 | return; | |
012da158 CL |
1629 | case -ECONNREFUSED: /* connection problems */ |
1630 | case -ECONNRESET: | |
1631 | case -ENOTCONN: | |
1632 | case -EHOSTDOWN: | |
1633 | case -EHOSTUNREACH: | |
1634 | case -ENETUNREACH: | |
1635 | case -EPIPE: | |
1636 | dprintk("RPC: %5u remote rpcbind unreachable: %d\n", | |
1637 | task->tk_pid, task->tk_status); | |
1638 | if (!RPC_IS_SOFTCONN(task)) { | |
1639 | rpc_delay(task, 5*HZ); | |
1640 | goto retry_timeout; | |
1641 | } | |
1642 | status = task->tk_status; | |
1643 | break; | |
da351878 | 1644 | default: |
46121cf7 | 1645 | dprintk("RPC: %5u unrecognized rpcbind error (%d)\n", |
da351878 | 1646 | task->tk_pid, -task->tk_status); |
da351878 CL |
1647 | } |
1648 | ||
1649 | rpc_exit(task, status); | |
1650 | return; | |
1651 | ||
da45828e TM |
1652 | retry_timeout: |
1653 | task->tk_action = call_timeout; | |
da351878 CL |
1654 | } |
1655 | ||
1656 | /* | |
1657 | * 4b. Connect to the RPC server | |
1da177e4 LT |
1658 | */ |
1659 | static void | |
1660 | call_connect(struct rpc_task *task) | |
1661 | { | |
ad2368d6 | 1662 | struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; |
1da177e4 | 1663 | |
46121cf7 | 1664 | dprintk("RPC: %5u call_connect xprt %p %s connected\n", |
da351878 CL |
1665 | task->tk_pid, xprt, |
1666 | (xprt_connected(xprt) ? "is" : "is not")); | |
1da177e4 | 1667 | |
da351878 CL |
1668 | task->tk_action = call_transmit; |
1669 | if (!xprt_connected(xprt)) { | |
1670 | task->tk_action = call_connect_status; | |
1671 | if (task->tk_status < 0) | |
1672 | return; | |
786615bc TM |
1673 | if (task->tk_flags & RPC_TASK_NOCONNECT) { |
1674 | rpc_exit(task, -ENOTCONN); | |
1675 | return; | |
1676 | } | |
da351878 | 1677 | xprt_connect(task); |
1da177e4 | 1678 | } |
1da177e4 LT |
1679 | } |
1680 | ||
1681 | /* | |
da351878 | 1682 | * 4c. Sort out connect result |
1da177e4 LT |
1683 | */ |
1684 | static void | |
1685 | call_connect_status(struct rpc_task *task) | |
1686 | { | |
1687 | struct rpc_clnt *clnt = task->tk_client; | |
1688 | int status = task->tk_status; | |
1689 | ||
46121cf7 | 1690 | dprint_status(task); |
da351878 | 1691 | |
5753cba1 | 1692 | trace_rpc_connect_status(task, status); |
1da177e4 | 1693 | switch (status) { |
da45828e TM |
1694 | /* if soft mounted, test if we've timed out */ |
1695 | case -ETIMEDOUT: | |
1696 | task->tk_action = call_timeout; | |
3ed5e2a2 TM |
1697 | return; |
1698 | case -ECONNREFUSED: | |
1699 | case -ECONNRESET: | |
1700 | case -ENETUNREACH: | |
1701 | if (RPC_IS_SOFTCONN(task)) | |
1702 | break; | |
1703 | /* retry with existing socket, after a delay */ | |
1704 | case 0: | |
1705 | case -EAGAIN: | |
1706 | task->tk_status = 0; | |
1707 | clnt->cl_stats->netreconn++; | |
1708 | task->tk_action = call_transmit; | |
1709 | return; | |
1da177e4 | 1710 | } |
3ed5e2a2 | 1711 | rpc_exit(task, status); |
1da177e4 LT |
1712 | } |
1713 | ||
1714 | /* | |
1715 | * 5. Transmit the RPC request, and wait for reply | |
1716 | */ | |
1717 | static void | |
1718 | call_transmit(struct rpc_task *task) | |
1719 | { | |
46121cf7 | 1720 | dprint_status(task); |
1da177e4 LT |
1721 | |
1722 | task->tk_action = call_status; | |
1723 | if (task->tk_status < 0) | |
1724 | return; | |
1725 | task->tk_status = xprt_prepare_transmit(task); | |
1726 | if (task->tk_status != 0) | |
1727 | return; | |
e0ab53de | 1728 | task->tk_action = call_transmit_status; |
1da177e4 | 1729 | /* Encode here so that rpcsec_gss can use correct sequence number. */ |
940e3318 | 1730 | if (rpc_task_need_encode(task)) { |
b0e1c57e | 1731 | rpc_xdr_encode(task); |
5e5ce5be | 1732 | /* Did the encode result in an error condition? */ |
8b39f2b4 TM |
1733 | if (task->tk_status != 0) { |
1734 | /* Was the error nonfatal? */ | |
1735 | if (task->tk_status == -EAGAIN) | |
1736 | rpc_delay(task, HZ >> 4); | |
1737 | else | |
1738 | rpc_exit(task, task->tk_status); | |
e0ab53de | 1739 | return; |
8b39f2b4 | 1740 | } |
5e5ce5be | 1741 | } |
1da177e4 LT |
1742 | xprt_transmit(task); |
1743 | if (task->tk_status < 0) | |
1744 | return; | |
e0ab53de TM |
1745 | /* |
1746 | * On success, ensure that we call xprt_end_transmit() before sleeping | |
1747 | * in order to allow access to the socket to other RPC requests. | |
1748 | */ | |
1749 | call_transmit_status(task); | |
55ae1aab | 1750 | if (rpc_reply_expected(task)) |
e0ab53de TM |
1751 | return; |
1752 | task->tk_action = rpc_exit_task; | |
a4f0835c | 1753 | rpc_wake_up_queued_task(&task->tk_rqstp->rq_xprt->pending, task); |
e0ab53de TM |
1754 | } |
1755 | ||
1756 | /* | |
1757 | * 5a. Handle cleanup after a transmission | |
1758 | */ | |
1759 | static void | |
1760 | call_transmit_status(struct rpc_task *task) | |
1761 | { | |
1762 | task->tk_action = call_status; | |
206a134b CL |
1763 | |
1764 | /* | |
1765 | * Common case: success. Force the compiler to put this | |
1766 | * test first. | |
1767 | */ | |
1768 | if (task->tk_status == 0) { | |
1769 | xprt_end_transmit(task); | |
1770 | rpc_task_force_reencode(task); | |
1771 | return; | |
1772 | } | |
1773 | ||
15f081ca TM |
1774 | switch (task->tk_status) { |
1775 | case -EAGAIN: | |
1776 | break; | |
1777 | default: | |
206a134b | 1778 | dprint_status(task); |
15f081ca | 1779 | xprt_end_transmit(task); |
09a21c41 CL |
1780 | rpc_task_force_reencode(task); |
1781 | break; | |
15f081ca TM |
1782 | /* |
1783 | * Special cases: if we've been waiting on the | |
1784 | * socket's write_space() callback, or if the | |
1785 | * socket just returned a connection error, | |
1786 | * then hold onto the transport lock. | |
1787 | */ | |
1788 | case -ECONNREFUSED: | |
15f081ca TM |
1789 | case -EHOSTDOWN: |
1790 | case -EHOSTUNREACH: | |
1791 | case -ENETUNREACH: | |
09a21c41 CL |
1792 | if (RPC_IS_SOFTCONN(task)) { |
1793 | xprt_end_transmit(task); | |
1794 | rpc_exit(task, task->tk_status); | |
1795 | break; | |
1796 | } | |
1797 | case -ECONNRESET: | |
1798 | case -ENOTCONN: | |
c8485e4d | 1799 | case -EPIPE: |
15f081ca TM |
1800 | rpc_task_force_reencode(task); |
1801 | } | |
1da177e4 LT |
1802 | } |
1803 | ||
9e00abc3 | 1804 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
55ae1aab RL |
1805 | /* |
1806 | * 5b. Send the backchannel RPC reply. On error, drop the reply. In | |
1807 | * addition, disconnect on connectivity errors. | |
1808 | */ | |
1809 | static void | |
1810 | call_bc_transmit(struct rpc_task *task) | |
1811 | { | |
1812 | struct rpc_rqst *req = task->tk_rqstp; | |
1813 | ||
55ae1aab RL |
1814 | task->tk_status = xprt_prepare_transmit(task); |
1815 | if (task->tk_status == -EAGAIN) { | |
1816 | /* | |
1817 | * Could not reserve the transport. Try again after the | |
1818 | * transport is released. | |
1819 | */ | |
1820 | task->tk_status = 0; | |
1821 | task->tk_action = call_bc_transmit; | |
1822 | return; | |
1823 | } | |
1824 | ||
1825 | task->tk_action = rpc_exit_task; | |
1826 | if (task->tk_status < 0) { | |
1827 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " | |
1828 | "error: %d\n", task->tk_status); | |
1829 | return; | |
1830 | } | |
1831 | ||
1832 | xprt_transmit(task); | |
1833 | xprt_end_transmit(task); | |
1834 | dprint_status(task); | |
1835 | switch (task->tk_status) { | |
1836 | case 0: | |
1837 | /* Success */ | |
1838 | break; | |
1839 | case -EHOSTDOWN: | |
1840 | case -EHOSTUNREACH: | |
1841 | case -ENETUNREACH: | |
1842 | case -ETIMEDOUT: | |
1843 | /* | |
1844 | * Problem reaching the server. Disconnect and let the | |
1845 | * forechannel reestablish the connection. The server will | |
1846 | * have to retransmit the backchannel request and we'll | |
1847 | * reprocess it. Since these ops are idempotent, there's no | |
1848 | * need to cache our reply at this time. | |
1849 | */ | |
1850 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " | |
1851 | "error: %d\n", task->tk_status); | |
a4f0835c | 1852 | xprt_conditional_disconnect(req->rq_xprt, |
55ae1aab RL |
1853 | req->rq_connect_cookie); |
1854 | break; | |
1855 | default: | |
1856 | /* | |
1857 | * We were unable to reply and will have to drop the | |
1858 | * request. The server should reconnect and retransmit. | |
1859 | */ | |
1facf4c4 | 1860 | WARN_ON_ONCE(task->tk_status == -EAGAIN); |
55ae1aab RL |
1861 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " |
1862 | "error: %d\n", task->tk_status); | |
1863 | break; | |
1864 | } | |
1865 | rpc_wake_up_queued_task(&req->rq_xprt->pending, task); | |
1866 | } | |
9e00abc3 | 1867 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
55ae1aab | 1868 | |
1da177e4 LT |
1869 | /* |
1870 | * 6. Sort out the RPC call status | |
1871 | */ | |
1872 | static void | |
1873 | call_status(struct rpc_task *task) | |
1874 | { | |
1875 | struct rpc_clnt *clnt = task->tk_client; | |
1876 | struct rpc_rqst *req = task->tk_rqstp; | |
1877 | int status; | |
1878 | ||
dd2b63d0 RL |
1879 | if (req->rq_reply_bytes_recvd > 0 && !req->rq_bytes_sent) |
1880 | task->tk_status = req->rq_reply_bytes_recvd; | |
1da177e4 | 1881 | |
46121cf7 | 1882 | dprint_status(task); |
1da177e4 LT |
1883 | |
1884 | status = task->tk_status; | |
1885 | if (status >= 0) { | |
1886 | task->tk_action = call_decode; | |
1887 | return; | |
1888 | } | |
1889 | ||
5753cba1 | 1890 | trace_rpc_call_status(task); |
1da177e4 LT |
1891 | task->tk_status = 0; |
1892 | switch(status) { | |
76303992 TM |
1893 | case -EHOSTDOWN: |
1894 | case -EHOSTUNREACH: | |
1895 | case -ENETUNREACH: | |
1896 | /* | |
1897 | * Delay any retries for 3 seconds, then handle as if it | |
1898 | * were a timeout. | |
1899 | */ | |
1900 | rpc_delay(task, 3*HZ); | |
1da177e4 LT |
1901 | case -ETIMEDOUT: |
1902 | task->tk_action = call_timeout; | |
241c39b9 | 1903 | if (task->tk_client->cl_discrtry) |
a4f0835c | 1904 | xprt_conditional_disconnect(req->rq_xprt, |
7c1d71cf | 1905 | req->rq_connect_cookie); |
1da177e4 | 1906 | break; |
c8485e4d | 1907 | case -ECONNRESET: |
1da177e4 | 1908 | case -ECONNREFUSED: |
35f5a422 | 1909 | rpc_force_rebind(clnt); |
c8485e4d TM |
1910 | rpc_delay(task, 3*HZ); |
1911 | case -EPIPE: | |
1912 | case -ENOTCONN: | |
1da177e4 LT |
1913 | task->tk_action = call_bind; |
1914 | break; | |
1915 | case -EAGAIN: | |
1916 | task->tk_action = call_transmit; | |
1917 | break; | |
1918 | case -EIO: | |
1919 | /* shutdown or soft timeout */ | |
1920 | rpc_exit(task, status); | |
1921 | break; | |
1922 | default: | |
b6b6152c OK |
1923 | if (clnt->cl_chatty) |
1924 | printk("%s: RPC call returned error %d\n", | |
55909f21 | 1925 | clnt->cl_program->name, -status); |
1da177e4 | 1926 | rpc_exit(task, status); |
1da177e4 LT |
1927 | } |
1928 | } | |
1929 | ||
1930 | /* | |
e0ab53de | 1931 | * 6a. Handle RPC timeout |
1da177e4 LT |
1932 | * We do not release the request slot, so we keep using the |
1933 | * same XID for all retransmits. | |
1934 | */ | |
1935 | static void | |
1936 | call_timeout(struct rpc_task *task) | |
1937 | { | |
1938 | struct rpc_clnt *clnt = task->tk_client; | |
1939 | ||
1940 | if (xprt_adjust_timeout(task->tk_rqstp) == 0) { | |
46121cf7 | 1941 | dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid); |
1da177e4 LT |
1942 | goto retry; |
1943 | } | |
1944 | ||
46121cf7 | 1945 | dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid); |
ef759a2e CL |
1946 | task->tk_timeouts++; |
1947 | ||
3a28becc CL |
1948 | if (RPC_IS_SOFTCONN(task)) { |
1949 | rpc_exit(task, -ETIMEDOUT); | |
1950 | return; | |
1951 | } | |
1da177e4 | 1952 | if (RPC_IS_SOFT(task)) { |
cac5d07e | 1953 | if (clnt->cl_chatty) { |
4e0038b6 | 1954 | rcu_read_lock(); |
b6b6152c | 1955 | printk(KERN_NOTICE "%s: server %s not responding, timed out\n", |
55909f21 | 1956 | clnt->cl_program->name, |
4e0038b6 TM |
1957 | rcu_dereference(clnt->cl_xprt)->servername); |
1958 | rcu_read_unlock(); | |
cac5d07e | 1959 | } |
7494d00c TM |
1960 | if (task->tk_flags & RPC_TASK_TIMEOUT) |
1961 | rpc_exit(task, -ETIMEDOUT); | |
1962 | else | |
1963 | rpc_exit(task, -EIO); | |
1da177e4 LT |
1964 | return; |
1965 | } | |
1966 | ||
f518e35a | 1967 | if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) { |
1da177e4 | 1968 | task->tk_flags |= RPC_CALL_MAJORSEEN; |
4e0038b6 TM |
1969 | if (clnt->cl_chatty) { |
1970 | rcu_read_lock(); | |
b6b6152c | 1971 | printk(KERN_NOTICE "%s: server %s not responding, still trying\n", |
55909f21 | 1972 | clnt->cl_program->name, |
4e0038b6 TM |
1973 | rcu_dereference(clnt->cl_xprt)->servername); |
1974 | rcu_read_unlock(); | |
1975 | } | |
1da177e4 | 1976 | } |
35f5a422 | 1977 | rpc_force_rebind(clnt); |
b48633bd TM |
1978 | /* |
1979 | * Did our request time out due to an RPCSEC_GSS out-of-sequence | |
1980 | * event? RFC2203 requires the server to drop all such requests. | |
1981 | */ | |
1982 | rpcauth_invalcred(task); | |
1da177e4 LT |
1983 | |
1984 | retry: | |
1985 | clnt->cl_stats->rpcretrans++; | |
1986 | task->tk_action = call_bind; | |
1987 | task->tk_status = 0; | |
1988 | } | |
1989 | ||
1990 | /* | |
1991 | * 7. Decode the RPC reply | |
1992 | */ | |
1993 | static void | |
1994 | call_decode(struct rpc_task *task) | |
1995 | { | |
1996 | struct rpc_clnt *clnt = task->tk_client; | |
1997 | struct rpc_rqst *req = task->tk_rqstp; | |
bf269551 | 1998 | kxdrdproc_t decode = task->tk_msg.rpc_proc->p_decode; |
d8ed029d | 1999 | __be32 *p; |
1da177e4 | 2000 | |
726fd6ad | 2001 | dprint_status(task); |
1da177e4 | 2002 | |
f518e35a | 2003 | if (task->tk_flags & RPC_CALL_MAJORSEEN) { |
4e0038b6 TM |
2004 | if (clnt->cl_chatty) { |
2005 | rcu_read_lock(); | |
b6b6152c | 2006 | printk(KERN_NOTICE "%s: server %s OK\n", |
55909f21 | 2007 | clnt->cl_program->name, |
4e0038b6 TM |
2008 | rcu_dereference(clnt->cl_xprt)->servername); |
2009 | rcu_read_unlock(); | |
2010 | } | |
1da177e4 LT |
2011 | task->tk_flags &= ~RPC_CALL_MAJORSEEN; |
2012 | } | |
2013 | ||
43ac3f29 TM |
2014 | /* |
2015 | * Ensure that we see all writes made by xprt_complete_rqst() | |
dd2b63d0 | 2016 | * before it changed req->rq_reply_bytes_recvd. |
43ac3f29 TM |
2017 | */ |
2018 | smp_rmb(); | |
1da177e4 LT |
2019 | req->rq_rcv_buf.len = req->rq_private_buf.len; |
2020 | ||
2021 | /* Check that the softirq receive buffer is valid */ | |
2022 | WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf, | |
2023 | sizeof(req->rq_rcv_buf)) != 0); | |
2024 | ||
1e799b67 TM |
2025 | if (req->rq_rcv_buf.len < 12) { |
2026 | if (!RPC_IS_SOFT(task)) { | |
2027 | task->tk_action = call_bind; | |
2028 | clnt->cl_stats->rpcretrans++; | |
2029 | goto out_retry; | |
2030 | } | |
2031 | dprintk("RPC: %s: too small RPC reply size (%d bytes)\n", | |
55909f21 | 2032 | clnt->cl_program->name, task->tk_status); |
1e799b67 TM |
2033 | task->tk_action = call_timeout; |
2034 | goto out_retry; | |
2035 | } | |
2036 | ||
b0e1c57e | 2037 | p = rpc_verify_header(task); |
abbcf28f TM |
2038 | if (IS_ERR(p)) { |
2039 | if (p == ERR_PTR(-EAGAIN)) | |
2040 | goto out_retry; | |
2041 | return; | |
1da177e4 LT |
2042 | } |
2043 | ||
abbcf28f | 2044 | task->tk_action = rpc_exit_task; |
1da177e4 | 2045 | |
6d5fcb5a | 2046 | if (decode) { |
1da177e4 LT |
2047 | task->tk_status = rpcauth_unwrap_resp(task, decode, req, p, |
2048 | task->tk_msg.rpc_resp); | |
6d5fcb5a | 2049 | } |
46121cf7 CL |
2050 | dprintk("RPC: %5u call_decode result %d\n", task->tk_pid, |
2051 | task->tk_status); | |
1da177e4 LT |
2052 | return; |
2053 | out_retry: | |
1da177e4 | 2054 | task->tk_status = 0; |
b0e1c57e | 2055 | /* Note: rpc_verify_header() may have freed the RPC slot */ |
24b74bf0 | 2056 | if (task->tk_rqstp == req) { |
dd2b63d0 | 2057 | req->rq_reply_bytes_recvd = req->rq_rcv_buf.len = 0; |
24b74bf0 | 2058 | if (task->tk_client->cl_discrtry) |
a4f0835c | 2059 | xprt_conditional_disconnect(req->rq_xprt, |
7c1d71cf | 2060 | req->rq_connect_cookie); |
24b74bf0 | 2061 | } |
1da177e4 LT |
2062 | } |
2063 | ||
d8ed029d | 2064 | static __be32 * |
b0e1c57e | 2065 | rpc_encode_header(struct rpc_task *task) |
1da177e4 LT |
2066 | { |
2067 | struct rpc_clnt *clnt = task->tk_client; | |
1da177e4 | 2068 | struct rpc_rqst *req = task->tk_rqstp; |
d8ed029d | 2069 | __be32 *p = req->rq_svec[0].iov_base; |
1da177e4 LT |
2070 | |
2071 | /* FIXME: check buffer size? */ | |
808012fb | 2072 | |
a4f0835c | 2073 | p = xprt_skip_transport_header(req->rq_xprt, p); |
1da177e4 LT |
2074 | *p++ = req->rq_xid; /* XID */ |
2075 | *p++ = htonl(RPC_CALL); /* CALL */ | |
2076 | *p++ = htonl(RPC_VERSION); /* RPC version */ | |
2077 | *p++ = htonl(clnt->cl_prog); /* program number */ | |
2078 | *p++ = htonl(clnt->cl_vers); /* program version */ | |
2079 | *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */ | |
334ccfd5 TM |
2080 | p = rpcauth_marshcred(task, p); |
2081 | req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p); | |
2082 | return p; | |
1da177e4 LT |
2083 | } |
2084 | ||
d8ed029d | 2085 | static __be32 * |
b0e1c57e | 2086 | rpc_verify_header(struct rpc_task *task) |
1da177e4 | 2087 | { |
4e0038b6 | 2088 | struct rpc_clnt *clnt = task->tk_client; |
1da177e4 LT |
2089 | struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0]; |
2090 | int len = task->tk_rqstp->rq_rcv_buf.len >> 2; | |
d8ed029d AD |
2091 | __be32 *p = iov->iov_base; |
2092 | u32 n; | |
1da177e4 LT |
2093 | int error = -EACCES; |
2094 | ||
e8896495 DH |
2095 | if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) { |
2096 | /* RFC-1014 says that the representation of XDR data must be a | |
2097 | * multiple of four bytes | |
2098 | * - if it isn't pointer subtraction in the NFS client may give | |
2099 | * undefined results | |
2100 | */ | |
8a702bbb | 2101 | dprintk("RPC: %5u %s: XDR representation not a multiple of" |
0dc47877 | 2102 | " 4 bytes: 0x%x\n", task->tk_pid, __func__, |
8a702bbb | 2103 | task->tk_rqstp->rq_rcv_buf.len); |
35fa5f7b AA |
2104 | error = -EIO; |
2105 | goto out_err; | |
e8896495 | 2106 | } |
1da177e4 LT |
2107 | if ((len -= 3) < 0) |
2108 | goto out_overflow; | |
1da177e4 | 2109 | |
f4a2e418 | 2110 | p += 1; /* skip XID */ |
1da177e4 | 2111 | if ((n = ntohl(*p++)) != RPC_REPLY) { |
8a702bbb | 2112 | dprintk("RPC: %5u %s: not an RPC reply: %x\n", |
f4a2e418 | 2113 | task->tk_pid, __func__, n); |
35fa5f7b | 2114 | error = -EIO; |
abbcf28f | 2115 | goto out_garbage; |
1da177e4 | 2116 | } |
f4a2e418 | 2117 | |
1da177e4 LT |
2118 | if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) { |
2119 | if (--len < 0) | |
2120 | goto out_overflow; | |
2121 | switch ((n = ntohl(*p++))) { | |
89f0e4fe JP |
2122 | case RPC_AUTH_ERROR: |
2123 | break; | |
2124 | case RPC_MISMATCH: | |
2125 | dprintk("RPC: %5u %s: RPC call version mismatch!\n", | |
2126 | task->tk_pid, __func__); | |
2127 | error = -EPROTONOSUPPORT; | |
2128 | goto out_err; | |
2129 | default: | |
2130 | dprintk("RPC: %5u %s: RPC call rejected, " | |
2131 | "unknown error: %x\n", | |
2132 | task->tk_pid, __func__, n); | |
35fa5f7b AA |
2133 | error = -EIO; |
2134 | goto out_err; | |
1da177e4 LT |
2135 | } |
2136 | if (--len < 0) | |
2137 | goto out_overflow; | |
2138 | switch ((n = ntohl(*p++))) { | |
2139 | case RPC_AUTH_REJECTEDCRED: | |
2140 | case RPC_AUTH_REJECTEDVERF: | |
2141 | case RPCSEC_GSS_CREDPROBLEM: | |
2142 | case RPCSEC_GSS_CTXPROBLEM: | |
2143 | if (!task->tk_cred_retry) | |
2144 | break; | |
2145 | task->tk_cred_retry--; | |
46121cf7 | 2146 | dprintk("RPC: %5u %s: retry stale creds\n", |
0dc47877 | 2147 | task->tk_pid, __func__); |
1da177e4 | 2148 | rpcauth_invalcred(task); |
220bcc2a TM |
2149 | /* Ensure we obtain a new XID! */ |
2150 | xprt_release(task); | |
118df3d1 | 2151 | task->tk_action = call_reserve; |
abbcf28f | 2152 | goto out_retry; |
1da177e4 LT |
2153 | case RPC_AUTH_BADCRED: |
2154 | case RPC_AUTH_BADVERF: | |
2155 | /* possibly garbled cred/verf? */ | |
2156 | if (!task->tk_garb_retry) | |
2157 | break; | |
2158 | task->tk_garb_retry--; | |
46121cf7 | 2159 | dprintk("RPC: %5u %s: retry garbled creds\n", |
0dc47877 | 2160 | task->tk_pid, __func__); |
1da177e4 | 2161 | task->tk_action = call_bind; |
abbcf28f | 2162 | goto out_retry; |
1da177e4 | 2163 | case RPC_AUTH_TOOWEAK: |
4e0038b6 | 2164 | rcu_read_lock(); |
b0e1c57e | 2165 | printk(KERN_NOTICE "RPC: server %s requires stronger " |
4e0038b6 TM |
2166 | "authentication.\n", |
2167 | rcu_dereference(clnt->cl_xprt)->servername); | |
2168 | rcu_read_unlock(); | |
1da177e4 LT |
2169 | break; |
2170 | default: | |
8a702bbb | 2171 | dprintk("RPC: %5u %s: unknown auth error: %x\n", |
0dc47877 | 2172 | task->tk_pid, __func__, n); |
1da177e4 LT |
2173 | error = -EIO; |
2174 | } | |
46121cf7 | 2175 | dprintk("RPC: %5u %s: call rejected %d\n", |
0dc47877 | 2176 | task->tk_pid, __func__, n); |
1da177e4 LT |
2177 | goto out_err; |
2178 | } | |
35fa5f7b AA |
2179 | p = rpcauth_checkverf(task, p); |
2180 | if (IS_ERR(p)) { | |
2181 | error = PTR_ERR(p); | |
2182 | dprintk("RPC: %5u %s: auth check failed with %d\n", | |
2183 | task->tk_pid, __func__, error); | |
abbcf28f | 2184 | goto out_garbage; /* bad verifier, retry */ |
1da177e4 | 2185 | } |
d8ed029d | 2186 | len = p - (__be32 *)iov->iov_base - 1; |
1da177e4 LT |
2187 | if (len < 0) |
2188 | goto out_overflow; | |
2189 | switch ((n = ntohl(*p++))) { | |
2190 | case RPC_SUCCESS: | |
2191 | return p; | |
2192 | case RPC_PROG_UNAVAIL: | |
4e0038b6 TM |
2193 | dprintk_rcu("RPC: %5u %s: program %u is unsupported " |
2194 | "by server %s\n", task->tk_pid, __func__, | |
2195 | (unsigned int)clnt->cl_prog, | |
2196 | rcu_dereference(clnt->cl_xprt)->servername); | |
cdf47706 AG |
2197 | error = -EPFNOSUPPORT; |
2198 | goto out_err; | |
1da177e4 | 2199 | case RPC_PROG_MISMATCH: |
4e0038b6 TM |
2200 | dprintk_rcu("RPC: %5u %s: program %u, version %u unsupported " |
2201 | "by server %s\n", task->tk_pid, __func__, | |
2202 | (unsigned int)clnt->cl_prog, | |
2203 | (unsigned int)clnt->cl_vers, | |
2204 | rcu_dereference(clnt->cl_xprt)->servername); | |
cdf47706 AG |
2205 | error = -EPROTONOSUPPORT; |
2206 | goto out_err; | |
1da177e4 | 2207 | case RPC_PROC_UNAVAIL: |
4e0038b6 | 2208 | dprintk_rcu("RPC: %5u %s: proc %s unsupported by program %u, " |
46121cf7 | 2209 | "version %u on server %s\n", |
0dc47877 | 2210 | task->tk_pid, __func__, |
3748f1e4 | 2211 | rpc_proc_name(task), |
4e0038b6 TM |
2212 | clnt->cl_prog, clnt->cl_vers, |
2213 | rcu_dereference(clnt->cl_xprt)->servername); | |
cdf47706 AG |
2214 | error = -EOPNOTSUPP; |
2215 | goto out_err; | |
1da177e4 | 2216 | case RPC_GARBAGE_ARGS: |
46121cf7 | 2217 | dprintk("RPC: %5u %s: server saw garbage\n", |
0dc47877 | 2218 | task->tk_pid, __func__); |
1da177e4 LT |
2219 | break; /* retry */ |
2220 | default: | |
8a702bbb | 2221 | dprintk("RPC: %5u %s: server accept status: %x\n", |
0dc47877 | 2222 | task->tk_pid, __func__, n); |
1da177e4 LT |
2223 | /* Also retry */ |
2224 | } | |
2225 | ||
abbcf28f | 2226 | out_garbage: |
4e0038b6 | 2227 | clnt->cl_stats->rpcgarbage++; |
1da177e4 LT |
2228 | if (task->tk_garb_retry) { |
2229 | task->tk_garb_retry--; | |
46121cf7 | 2230 | dprintk("RPC: %5u %s: retrying\n", |
0dc47877 | 2231 | task->tk_pid, __func__); |
1da177e4 | 2232 | task->tk_action = call_bind; |
abbcf28f TM |
2233 | out_retry: |
2234 | return ERR_PTR(-EAGAIN); | |
1da177e4 | 2235 | } |
1da177e4 LT |
2236 | out_err: |
2237 | rpc_exit(task, error); | |
8a702bbb | 2238 | dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid, |
0dc47877 | 2239 | __func__, error); |
abbcf28f | 2240 | return ERR_PTR(error); |
1da177e4 | 2241 | out_overflow: |
8a702bbb | 2242 | dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid, |
0dc47877 | 2243 | __func__); |
abbcf28f | 2244 | goto out_garbage; |
1da177e4 | 2245 | } |
5ee0ed7d | 2246 | |
9f06c719 | 2247 | static void rpcproc_encode_null(void *rqstp, struct xdr_stream *xdr, void *obj) |
5ee0ed7d | 2248 | { |
5ee0ed7d TM |
2249 | } |
2250 | ||
bf269551 | 2251 | static int rpcproc_decode_null(void *rqstp, struct xdr_stream *xdr, void *obj) |
5ee0ed7d TM |
2252 | { |
2253 | return 0; | |
2254 | } | |
2255 | ||
2256 | static struct rpc_procinfo rpcproc_null = { | |
2257 | .p_encode = rpcproc_encode_null, | |
2258 | .p_decode = rpcproc_decode_null, | |
2259 | }; | |
2260 | ||
caabea8a | 2261 | static int rpc_ping(struct rpc_clnt *clnt) |
5ee0ed7d TM |
2262 | { |
2263 | struct rpc_message msg = { | |
2264 | .rpc_proc = &rpcproc_null, | |
2265 | }; | |
2266 | int err; | |
2267 | msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0); | |
caabea8a | 2268 | err = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN); |
5ee0ed7d TM |
2269 | put_rpccred(msg.rpc_cred); |
2270 | return err; | |
2271 | } | |
188fef11 | 2272 | |
5e1550d6 TM |
2273 | struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags) |
2274 | { | |
2275 | struct rpc_message msg = { | |
2276 | .rpc_proc = &rpcproc_null, | |
2277 | .rpc_cred = cred, | |
2278 | }; | |
84115e1c TM |
2279 | struct rpc_task_setup task_setup_data = { |
2280 | .rpc_client = clnt, | |
2281 | .rpc_message = &msg, | |
2282 | .callback_ops = &rpc_default_ops, | |
2283 | .flags = flags, | |
2284 | }; | |
c970aa85 | 2285 | return rpc_run_task(&task_setup_data); |
5e1550d6 | 2286 | } |
e8914c65 | 2287 | EXPORT_SYMBOL_GPL(rpc_call_null); |
5e1550d6 | 2288 | |
188fef11 | 2289 | #ifdef RPC_DEBUG |
68a23ee9 CL |
2290 | static void rpc_show_header(void) |
2291 | { | |
cb3997b5 CL |
2292 | printk(KERN_INFO "-pid- flgs status -client- --rqstp- " |
2293 | "-timeout ---ops--\n"); | |
68a23ee9 CL |
2294 | } |
2295 | ||
38e886e0 CL |
2296 | static void rpc_show_task(const struct rpc_clnt *clnt, |
2297 | const struct rpc_task *task) | |
2298 | { | |
2299 | const char *rpc_waitq = "none"; | |
38e886e0 CL |
2300 | |
2301 | if (RPC_IS_QUEUED(task)) | |
2302 | rpc_waitq = rpc_qname(task->tk_waitqueue); | |
2303 | ||
b3bcedad | 2304 | printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%ps q:%s\n", |
cb3997b5 CL |
2305 | task->tk_pid, task->tk_flags, task->tk_status, |
2306 | clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops, | |
55909f21 | 2307 | clnt->cl_program->name, clnt->cl_vers, rpc_proc_name(task), |
b3bcedad | 2308 | task->tk_action, rpc_waitq); |
38e886e0 CL |
2309 | } |
2310 | ||
70abc49b | 2311 | void rpc_show_tasks(struct net *net) |
188fef11 TM |
2312 | { |
2313 | struct rpc_clnt *clnt; | |
38e886e0 | 2314 | struct rpc_task *task; |
68a23ee9 | 2315 | int header = 0; |
70abc49b | 2316 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
188fef11 | 2317 | |
70abc49b SK |
2318 | spin_lock(&sn->rpc_client_lock); |
2319 | list_for_each_entry(clnt, &sn->all_clients, cl_clients) { | |
188fef11 | 2320 | spin_lock(&clnt->cl_lock); |
38e886e0 | 2321 | list_for_each_entry(task, &clnt->cl_tasks, tk_task) { |
68a23ee9 CL |
2322 | if (!header) { |
2323 | rpc_show_header(); | |
2324 | header++; | |
2325 | } | |
38e886e0 | 2326 | rpc_show_task(clnt, task); |
188fef11 TM |
2327 | } |
2328 | spin_unlock(&clnt->cl_lock); | |
2329 | } | |
70abc49b | 2330 | spin_unlock(&sn->rpc_client_lock); |
188fef11 TM |
2331 | } |
2332 | #endif |