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> | |
1da177e4 | 36 | #include <linux/sunrpc/rpc_pipe_fs.h> |
11c556b3 | 37 | #include <linux/sunrpc/metrics.h> |
55ae1aab | 38 | #include <linux/sunrpc/bc_xprt.h> |
5753cba1 | 39 | #include <trace/events/sunrpc.h> |
1da177e4 | 40 | |
55ae1aab | 41 | #include "sunrpc.h" |
70abc49b | 42 | #include "netns.h" |
1da177e4 | 43 | |
1da177e4 LT |
44 | #ifdef RPC_DEBUG |
45 | # define RPCDBG_FACILITY RPCDBG_CALL | |
46 | #endif | |
47 | ||
46121cf7 CL |
48 | #define dprint_status(t) \ |
49 | dprintk("RPC: %5u %s (status %d)\n", t->tk_pid, \ | |
0dc47877 | 50 | __func__, t->tk_status) |
46121cf7 | 51 | |
188fef11 TM |
52 | /* |
53 | * All RPC clients are linked into this list | |
54 | */ | |
188fef11 | 55 | |
1da177e4 LT |
56 | static DECLARE_WAIT_QUEUE_HEAD(destroy_wait); |
57 | ||
58 | ||
59 | static void call_start(struct rpc_task *task); | |
60 | static void call_reserve(struct rpc_task *task); | |
61 | static void call_reserveresult(struct rpc_task *task); | |
62 | static void call_allocate(struct rpc_task *task); | |
1da177e4 LT |
63 | static void call_decode(struct rpc_task *task); |
64 | static void call_bind(struct rpc_task *task); | |
da351878 | 65 | static void call_bind_status(struct rpc_task *task); |
1da177e4 | 66 | static void call_transmit(struct rpc_task *task); |
9e00abc3 | 67 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
55ae1aab | 68 | static void call_bc_transmit(struct rpc_task *task); |
9e00abc3 | 69 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
1da177e4 | 70 | static void call_status(struct rpc_task *task); |
940e3318 | 71 | static void call_transmit_status(struct rpc_task *task); |
1da177e4 LT |
72 | static void call_refresh(struct rpc_task *task); |
73 | static void call_refreshresult(struct rpc_task *task); | |
74 | static void call_timeout(struct rpc_task *task); | |
75 | static void call_connect(struct rpc_task *task); | |
76 | static void call_connect_status(struct rpc_task *task); | |
1da177e4 | 77 | |
b0e1c57e CL |
78 | static __be32 *rpc_encode_header(struct rpc_task *task); |
79 | static __be32 *rpc_verify_header(struct rpc_task *task); | |
caabea8a | 80 | static int rpc_ping(struct rpc_clnt *clnt); |
64c91a1f | 81 | |
188fef11 TM |
82 | static void rpc_register_client(struct rpc_clnt *clnt) |
83 | { | |
2446ab60 TM |
84 | struct net *net = rpc_net_ns(clnt); |
85 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
70abc49b SK |
86 | |
87 | spin_lock(&sn->rpc_client_lock); | |
88 | list_add(&clnt->cl_clients, &sn->all_clients); | |
89 | spin_unlock(&sn->rpc_client_lock); | |
188fef11 TM |
90 | } |
91 | ||
92 | static void rpc_unregister_client(struct rpc_clnt *clnt) | |
93 | { | |
2446ab60 TM |
94 | struct net *net = rpc_net_ns(clnt); |
95 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
70abc49b SK |
96 | |
97 | spin_lock(&sn->rpc_client_lock); | |
188fef11 | 98 | list_del(&clnt->cl_clients); |
70abc49b | 99 | spin_unlock(&sn->rpc_client_lock); |
188fef11 | 100 | } |
1da177e4 | 101 | |
0157d021 SK |
102 | static void __rpc_clnt_remove_pipedir(struct rpc_clnt *clnt) |
103 | { | |
30507f58 | 104 | if (clnt->cl_dentry) { |
80df9d20 SK |
105 | if (clnt->cl_auth && clnt->cl_auth->au_ops->pipes_destroy) |
106 | clnt->cl_auth->au_ops->pipes_destroy(clnt->cl_auth); | |
30507f58 | 107 | rpc_remove_client_dir(clnt->cl_dentry); |
80df9d20 | 108 | } |
30507f58 | 109 | clnt->cl_dentry = NULL; |
0157d021 SK |
110 | } |
111 | ||
112 | static void rpc_clnt_remove_pipedir(struct rpc_clnt *clnt) | |
113 | { | |
2446ab60 | 114 | struct net *net = rpc_net_ns(clnt); |
0157d021 | 115 | struct super_block *pipefs_sb; |
0157d021 | 116 | |
2446ab60 | 117 | pipefs_sb = rpc_get_sb_net(net); |
0157d021 | 118 | if (pipefs_sb) { |
0157d021 | 119 | __rpc_clnt_remove_pipedir(clnt); |
2446ab60 | 120 | rpc_put_sb_net(net); |
0157d021 | 121 | } |
0157d021 SK |
122 | } |
123 | ||
124 | static struct dentry *rpc_setup_pipedir_sb(struct super_block *sb, | |
080b794c TM |
125 | struct rpc_clnt *clnt, |
126 | const char *dir_name) | |
1da177e4 | 127 | { |
f134585a | 128 | static uint32_t clntid; |
23ac6581 | 129 | char name[15]; |
26fe5750 | 130 | struct qstr q = { .name = name }; |
0157d021 | 131 | struct dentry *dir, *dentry; |
1da177e4 LT |
132 | int error; |
133 | ||
0157d021 SK |
134 | dir = rpc_d_lookup_sb(sb, dir_name); |
135 | if (dir == NULL) | |
136 | return dir; | |
f134585a | 137 | for (;;) { |
23ac6581 TM |
138 | q.len = snprintf(name, sizeof(name), "clnt%x", (unsigned int)clntid++); |
139 | name[sizeof(name) - 1] = '\0'; | |
140 | q.hash = full_name_hash(q.name, q.len); | |
0157d021 SK |
141 | dentry = rpc_create_client_dir(dir, &q, clnt); |
142 | if (!IS_ERR(dentry)) | |
23ac6581 | 143 | break; |
0157d021 | 144 | error = PTR_ERR(dentry); |
f134585a | 145 | if (error != -EEXIST) { |
23ac6581 TM |
146 | printk(KERN_INFO "RPC: Couldn't create pipefs entry" |
147 | " %s/%s, error %d\n", | |
148 | dir_name, name, error); | |
0157d021 | 149 | break; |
f134585a | 150 | } |
1da177e4 | 151 | } |
0157d021 SK |
152 | dput(dir); |
153 | return dentry; | |
154 | } | |
155 | ||
156 | static int | |
080b794c | 157 | rpc_setup_pipedir(struct rpc_clnt *clnt, const char *dir_name) |
0157d021 | 158 | { |
2446ab60 | 159 | struct net *net = rpc_net_ns(clnt); |
0157d021 | 160 | struct super_block *pipefs_sb; |
30507f58 | 161 | struct dentry *dentry; |
0157d021 | 162 | |
30507f58 | 163 | clnt->cl_dentry = NULL; |
0157d021 SK |
164 | if (dir_name == NULL) |
165 | return 0; | |
2446ab60 | 166 | pipefs_sb = rpc_get_sb_net(net); |
70fe25b6 SK |
167 | if (!pipefs_sb) |
168 | return 0; | |
30507f58 | 169 | dentry = rpc_setup_pipedir_sb(pipefs_sb, clnt, dir_name); |
2446ab60 | 170 | rpc_put_sb_net(net); |
30507f58 SK |
171 | if (IS_ERR(dentry)) |
172 | return PTR_ERR(dentry); | |
173 | clnt->cl_dentry = dentry; | |
23ac6581 | 174 | return 0; |
1da177e4 LT |
175 | } |
176 | ||
ea8cfa06 SK |
177 | static inline int rpc_clnt_skip_event(struct rpc_clnt *clnt, unsigned long event) |
178 | { | |
179 | if (((event == RPC_PIPEFS_MOUNT) && clnt->cl_dentry) || | |
180 | ((event == RPC_PIPEFS_UMOUNT) && !clnt->cl_dentry)) | |
181 | return 1; | |
182 | return 0; | |
183 | } | |
184 | ||
185 | static int __rpc_clnt_handle_event(struct rpc_clnt *clnt, unsigned long event, | |
186 | struct super_block *sb) | |
80df9d20 SK |
187 | { |
188 | struct dentry *dentry; | |
189 | int err = 0; | |
190 | ||
191 | switch (event) { | |
192 | case RPC_PIPEFS_MOUNT: | |
80df9d20 SK |
193 | dentry = rpc_setup_pipedir_sb(sb, clnt, |
194 | clnt->cl_program->pipe_dir_name); | |
195 | BUG_ON(dentry == NULL); | |
196 | if (IS_ERR(dentry)) | |
197 | return PTR_ERR(dentry); | |
30507f58 | 198 | clnt->cl_dentry = dentry; |
80df9d20 SK |
199 | if (clnt->cl_auth->au_ops->pipes_create) { |
200 | err = clnt->cl_auth->au_ops->pipes_create(clnt->cl_auth); | |
201 | if (err) | |
202 | __rpc_clnt_remove_pipedir(clnt); | |
203 | } | |
204 | break; | |
205 | case RPC_PIPEFS_UMOUNT: | |
206 | __rpc_clnt_remove_pipedir(clnt); | |
207 | break; | |
208 | default: | |
209 | printk(KERN_ERR "%s: unknown event: %ld\n", __func__, event); | |
210 | return -ENOTSUPP; | |
211 | } | |
212 | return err; | |
213 | } | |
214 | ||
ea8cfa06 SK |
215 | static int __rpc_pipefs_event(struct rpc_clnt *clnt, unsigned long event, |
216 | struct super_block *sb) | |
217 | { | |
218 | int error = 0; | |
219 | ||
220 | for (;; clnt = clnt->cl_parent) { | |
221 | if (!rpc_clnt_skip_event(clnt, event)) | |
222 | error = __rpc_clnt_handle_event(clnt, event, sb); | |
223 | if (error || clnt == clnt->cl_parent) | |
224 | break; | |
225 | } | |
226 | return error; | |
227 | } | |
228 | ||
da3b4622 SK |
229 | static struct rpc_clnt *rpc_get_client_for_event(struct net *net, int event) |
230 | { | |
231 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
232 | struct rpc_clnt *clnt; | |
233 | ||
234 | spin_lock(&sn->rpc_client_lock); | |
235 | list_for_each_entry(clnt, &sn->all_clients, cl_clients) { | |
7aab449e SK |
236 | if (clnt->cl_program->pipe_dir_name == NULL) |
237 | break; | |
ea8cfa06 | 238 | if (rpc_clnt_skip_event(clnt, event)) |
da3b4622 | 239 | continue; |
a4dff1bc SK |
240 | if (atomic_inc_not_zero(&clnt->cl_count) == 0) |
241 | continue; | |
da3b4622 SK |
242 | spin_unlock(&sn->rpc_client_lock); |
243 | return clnt; | |
244 | } | |
245 | spin_unlock(&sn->rpc_client_lock); | |
246 | return NULL; | |
247 | } | |
248 | ||
80df9d20 SK |
249 | static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event, |
250 | void *ptr) | |
251 | { | |
252 | struct super_block *sb = ptr; | |
253 | struct rpc_clnt *clnt; | |
254 | int error = 0; | |
80df9d20 | 255 | |
da3b4622 | 256 | while ((clnt = rpc_get_client_for_event(sb->s_fs_info, event))) { |
80df9d20 | 257 | error = __rpc_pipefs_event(clnt, event, sb); |
da3b4622 | 258 | rpc_release_client(clnt); |
80df9d20 SK |
259 | if (error) |
260 | break; | |
261 | } | |
80df9d20 SK |
262 | return error; |
263 | } | |
264 | ||
265 | static struct notifier_block rpc_clients_block = { | |
266 | .notifier_call = rpc_pipefs_event, | |
eee17325 | 267 | .priority = SUNRPC_PIPEFS_RPC_PRIO, |
80df9d20 SK |
268 | }; |
269 | ||
270 | int rpc_clients_notifier_register(void) | |
271 | { | |
272 | return rpc_pipefs_notifier_register(&rpc_clients_block); | |
273 | } | |
274 | ||
275 | void rpc_clients_notifier_unregister(void) | |
276 | { | |
277 | return rpc_pipefs_notifier_unregister(&rpc_clients_block); | |
278 | } | |
279 | ||
cbbb3449 TM |
280 | static void rpc_clnt_set_nodename(struct rpc_clnt *clnt, const char *nodename) |
281 | { | |
282 | clnt->cl_nodelen = strlen(nodename); | |
283 | if (clnt->cl_nodelen > UNX_MAXNODENAME) | |
284 | clnt->cl_nodelen = UNX_MAXNODENAME; | |
285 | memcpy(clnt->cl_nodename, nodename, clnt->cl_nodelen); | |
286 | } | |
287 | ||
698b6d08 | 288 | static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, struct rpc_xprt *xprt) |
1da177e4 | 289 | { |
a613fa16 TM |
290 | const struct rpc_program *program = args->program; |
291 | const struct rpc_version *version; | |
1da177e4 | 292 | struct rpc_clnt *clnt = NULL; |
6a19275a | 293 | struct rpc_auth *auth; |
1da177e4 | 294 | int err; |
06b8d255 CL |
295 | |
296 | /* sanity check the name before trying to print it */ | |
46121cf7 | 297 | dprintk("RPC: creating %s client for %s (xprt %p)\n", |
698b6d08 | 298 | program->name, args->servername, xprt); |
1da177e4 | 299 | |
4ada539e TM |
300 | err = rpciod_up(); |
301 | if (err) | |
302 | goto out_no_rpciod; | |
1da177e4 LT |
303 | err = -EINVAL; |
304 | if (!xprt) | |
712917d1 | 305 | goto out_no_xprt; |
698b6d08 TM |
306 | |
307 | if (args->version >= program->nrvers) | |
308 | goto out_err; | |
309 | version = program->version[args->version]; | |
310 | if (version == NULL) | |
1da177e4 LT |
311 | goto out_err; |
312 | ||
313 | err = -ENOMEM; | |
0da974f4 | 314 | clnt = kzalloc(sizeof(*clnt), GFP_KERNEL); |
1da177e4 LT |
315 | if (!clnt) |
316 | goto out_err; | |
1da177e4 LT |
317 | clnt->cl_parent = clnt; |
318 | ||
2446ab60 | 319 | rcu_assign_pointer(clnt->cl_xprt, xprt); |
1da177e4 LT |
320 | clnt->cl_procinfo = version->procs; |
321 | clnt->cl_maxproc = version->nrprocs; | |
322 | clnt->cl_protname = program->name; | |
d5b337b4 | 323 | clnt->cl_prog = args->prognumber ? : program->number; |
1da177e4 | 324 | clnt->cl_vers = version->number; |
1da177e4 | 325 | clnt->cl_stats = program->stats; |
11c556b3 | 326 | clnt->cl_metrics = rpc_alloc_iostats(clnt); |
23bf85ba TM |
327 | err = -ENOMEM; |
328 | if (clnt->cl_metrics == NULL) | |
329 | goto out_no_stats; | |
3e32a5d9 | 330 | clnt->cl_program = program; |
6529eba0 | 331 | INIT_LIST_HEAD(&clnt->cl_tasks); |
4bef61ff | 332 | spin_lock_init(&clnt->cl_lock); |
1da177e4 | 333 | |
2446ab60 | 334 | if (!xprt_bound(xprt)) |
1da177e4 LT |
335 | clnt->cl_autobind = 1; |
336 | ||
ba7392bb TM |
337 | clnt->cl_timeout = xprt->timeout; |
338 | if (args->timeout != NULL) { | |
339 | memcpy(&clnt->cl_timeout_default, args->timeout, | |
340 | sizeof(clnt->cl_timeout_default)); | |
341 | clnt->cl_timeout = &clnt->cl_timeout_default; | |
342 | } | |
343 | ||
1da177e4 | 344 | clnt->cl_rtt = &clnt->cl_rtt_default; |
ba7392bb | 345 | rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval); |
608207e8 OK |
346 | clnt->cl_principal = NULL; |
347 | if (args->client_name) { | |
348 | clnt->cl_principal = kstrdup(args->client_name, GFP_KERNEL); | |
349 | if (!clnt->cl_principal) | |
350 | goto out_no_principal; | |
351 | } | |
1da177e4 | 352 | |
006abe88 | 353 | atomic_set(&clnt->cl_count, 1); |
34f52e35 | 354 | |
1da177e4 LT |
355 | err = rpc_setup_pipedir(clnt, program->pipe_dir_name); |
356 | if (err < 0) | |
357 | goto out_no_path; | |
358 | ||
698b6d08 | 359 | auth = rpcauth_create(args->authflavor, clnt); |
6a19275a | 360 | if (IS_ERR(auth)) { |
1da177e4 | 361 | printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n", |
698b6d08 | 362 | args->authflavor); |
6a19275a | 363 | err = PTR_ERR(auth); |
1da177e4 LT |
364 | goto out_no_auth; |
365 | } | |
366 | ||
367 | /* save the nodename */ | |
cbbb3449 | 368 | rpc_clnt_set_nodename(clnt, utsname()->nodename); |
6529eba0 | 369 | rpc_register_client(clnt); |
1da177e4 LT |
370 | return clnt; |
371 | ||
372 | out_no_auth: | |
0157d021 | 373 | rpc_clnt_remove_pipedir(clnt); |
1da177e4 | 374 | out_no_path: |
608207e8 OK |
375 | kfree(clnt->cl_principal); |
376 | out_no_principal: | |
23bf85ba TM |
377 | rpc_free_iostats(clnt->cl_metrics); |
378 | out_no_stats: | |
1da177e4 LT |
379 | kfree(clnt); |
380 | out_err: | |
6b6ca86b | 381 | xprt_put(xprt); |
712917d1 | 382 | out_no_xprt: |
4ada539e TM |
383 | rpciod_down(); |
384 | out_no_rpciod: | |
1da177e4 LT |
385 | return ERR_PTR(err); |
386 | } | |
387 | ||
2c53040f | 388 | /** |
c2866763 CL |
389 | * rpc_create - create an RPC client and transport with one call |
390 | * @args: rpc_clnt create argument structure | |
391 | * | |
392 | * Creates and initializes an RPC transport and an RPC client. | |
393 | * | |
394 | * It can ping the server in order to determine if it is up, and to see if | |
395 | * it supports this program and version. RPC_CLNT_CREATE_NOPING disables | |
396 | * this behavior so asynchronous tasks can also use rpc_create. | |
397 | */ | |
398 | struct rpc_clnt *rpc_create(struct rpc_create_args *args) | |
399 | { | |
400 | struct rpc_xprt *xprt; | |
401 | struct rpc_clnt *clnt; | |
3c341b0b | 402 | struct xprt_create xprtargs = { |
9a23e332 | 403 | .net = args->net, |
4fa016eb | 404 | .ident = args->protocol, |
d3bc9a1d | 405 | .srcaddr = args->saddress, |
96802a09 FM |
406 | .dstaddr = args->address, |
407 | .addrlen = args->addrsize, | |
4e0038b6 | 408 | .servername = args->servername, |
f300baba | 409 | .bc_xprt = args->bc_xprt, |
96802a09 | 410 | }; |
510deb0d | 411 | char servername[48]; |
c2866763 | 412 | |
43780b87 CL |
413 | /* |
414 | * If the caller chooses not to specify a hostname, whip | |
415 | * up a string representation of the passed-in address. | |
416 | */ | |
4e0038b6 | 417 | if (xprtargs.servername == NULL) { |
176e21ee CL |
418 | struct sockaddr_un *sun = |
419 | (struct sockaddr_un *)args->address; | |
da09eb93 CL |
420 | struct sockaddr_in *sin = |
421 | (struct sockaddr_in *)args->address; | |
422 | struct sockaddr_in6 *sin6 = | |
423 | (struct sockaddr_in6 *)args->address; | |
424 | ||
510deb0d CL |
425 | servername[0] = '\0'; |
426 | switch (args->address->sa_family) { | |
176e21ee CL |
427 | case AF_LOCAL: |
428 | snprintf(servername, sizeof(servername), "%s", | |
429 | sun->sun_path); | |
430 | break; | |
da09eb93 | 431 | case AF_INET: |
21454aaa HH |
432 | snprintf(servername, sizeof(servername), "%pI4", |
433 | &sin->sin_addr.s_addr); | |
510deb0d | 434 | break; |
da09eb93 | 435 | case AF_INET6: |
5b095d98 | 436 | snprintf(servername, sizeof(servername), "%pI6", |
da09eb93 | 437 | &sin6->sin6_addr); |
510deb0d | 438 | break; |
510deb0d CL |
439 | default: |
440 | /* caller wants default server name, but | |
441 | * address family isn't recognized. */ | |
442 | return ERR_PTR(-EINVAL); | |
443 | } | |
4e0038b6 | 444 | xprtargs.servername = servername; |
43780b87 CL |
445 | } |
446 | ||
510deb0d CL |
447 | xprt = xprt_create_transport(&xprtargs); |
448 | if (IS_ERR(xprt)) | |
449 | return (struct rpc_clnt *)xprt; | |
450 | ||
c2866763 CL |
451 | /* |
452 | * By default, kernel RPC client connects from a reserved port. | |
453 | * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters, | |
454 | * but it is always enabled for rpciod, which handles the connect | |
455 | * operation. | |
456 | */ | |
457 | xprt->resvport = 1; | |
458 | if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT) | |
459 | xprt->resvport = 0; | |
460 | ||
698b6d08 | 461 | clnt = rpc_new_client(args, xprt); |
c2866763 CL |
462 | if (IS_ERR(clnt)) |
463 | return clnt; | |
464 | ||
465 | if (!(args->flags & RPC_CLNT_CREATE_NOPING)) { | |
caabea8a | 466 | int err = rpc_ping(clnt); |
c2866763 CL |
467 | if (err != 0) { |
468 | rpc_shutdown_client(clnt); | |
469 | return ERR_PTR(err); | |
470 | } | |
471 | } | |
472 | ||
473 | clnt->cl_softrtry = 1; | |
474 | if (args->flags & RPC_CLNT_CREATE_HARDRTRY) | |
475 | clnt->cl_softrtry = 0; | |
476 | ||
c2866763 CL |
477 | if (args->flags & RPC_CLNT_CREATE_AUTOBIND) |
478 | clnt->cl_autobind = 1; | |
43d78ef2 CL |
479 | if (args->flags & RPC_CLNT_CREATE_DISCRTRY) |
480 | clnt->cl_discrtry = 1; | |
b6b6152c OK |
481 | if (!(args->flags & RPC_CLNT_CREATE_QUIET)) |
482 | clnt->cl_chatty = 1; | |
c2866763 CL |
483 | |
484 | return clnt; | |
485 | } | |
b86acd50 | 486 | EXPORT_SYMBOL_GPL(rpc_create); |
c2866763 | 487 | |
1da177e4 LT |
488 | /* |
489 | * This function clones the RPC client structure. It allows us to share the | |
490 | * same transport while varying parameters such as the authentication | |
491 | * flavour. | |
492 | */ | |
493 | struct rpc_clnt * | |
494 | rpc_clone_client(struct rpc_clnt *clnt) | |
495 | { | |
496 | struct rpc_clnt *new; | |
2446ab60 | 497 | struct rpc_xprt *xprt; |
3e32a5d9 | 498 | int err = -ENOMEM; |
1da177e4 | 499 | |
e69062b4 | 500 | new = kmemdup(clnt, sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
501 | if (!new) |
502 | goto out_no_clnt; | |
d431a555 TM |
503 | new->cl_parent = clnt; |
504 | /* Turn off autobind on clones */ | |
505 | new->cl_autobind = 0; | |
506 | INIT_LIST_HEAD(&new->cl_tasks); | |
507 | spin_lock_init(&new->cl_lock); | |
ba7392bb | 508 | rpc_init_rtt(&new->cl_rtt_default, clnt->cl_timeout->to_initval); |
23bf85ba TM |
509 | new->cl_metrics = rpc_alloc_iostats(clnt); |
510 | if (new->cl_metrics == NULL) | |
511 | goto out_no_stats; | |
608207e8 OK |
512 | if (clnt->cl_principal) { |
513 | new->cl_principal = kstrdup(clnt->cl_principal, GFP_KERNEL); | |
514 | if (new->cl_principal == NULL) | |
515 | goto out_no_principal; | |
516 | } | |
2446ab60 TM |
517 | rcu_read_lock(); |
518 | xprt = xprt_get(rcu_dereference(clnt->cl_xprt)); | |
519 | rcu_read_unlock(); | |
520 | if (xprt == NULL) | |
521 | goto out_no_transport; | |
522 | rcu_assign_pointer(new->cl_xprt, xprt); | |
006abe88 | 523 | atomic_set(&new->cl_count, 1); |
3e32a5d9 TM |
524 | err = rpc_setup_pipedir(new, clnt->cl_program->pipe_dir_name); |
525 | if (err != 0) | |
526 | goto out_no_path; | |
cbbb3449 | 527 | rpc_clnt_set_nodename(new, utsname()->nodename); |
1da177e4 LT |
528 | if (new->cl_auth) |
529 | atomic_inc(&new->cl_auth->au_count); | |
006abe88 | 530 | atomic_inc(&clnt->cl_count); |
6529eba0 | 531 | rpc_register_client(new); |
4ada539e | 532 | rpciod_up(); |
1da177e4 | 533 | return new; |
3e32a5d9 | 534 | out_no_path: |
2446ab60 TM |
535 | xprt_put(xprt); |
536 | out_no_transport: | |
608207e8 OK |
537 | kfree(new->cl_principal); |
538 | out_no_principal: | |
3e32a5d9 | 539 | rpc_free_iostats(new->cl_metrics); |
23bf85ba TM |
540 | out_no_stats: |
541 | kfree(new); | |
1da177e4 | 542 | out_no_clnt: |
0dc47877 | 543 | dprintk("RPC: %s: returned error %d\n", __func__, err); |
3e32a5d9 | 544 | return ERR_PTR(err); |
1da177e4 | 545 | } |
e8914c65 | 546 | EXPORT_SYMBOL_GPL(rpc_clone_client); |
1da177e4 | 547 | |
58f9612c TM |
548 | /* |
549 | * Kill all tasks for the given client. | |
550 | * XXX: kill their descendants as well? | |
551 | */ | |
552 | void rpc_killall_tasks(struct rpc_clnt *clnt) | |
553 | { | |
554 | struct rpc_task *rovr; | |
555 | ||
556 | ||
557 | if (list_empty(&clnt->cl_tasks)) | |
558 | return; | |
559 | dprintk("RPC: killing all tasks for client %p\n", clnt); | |
560 | /* | |
561 | * Spin lock all_tasks to prevent changes... | |
562 | */ | |
563 | spin_lock(&clnt->cl_lock); | |
564 | list_for_each_entry(rovr, &clnt->cl_tasks, tk_task) { | |
565 | if (!RPC_IS_ACTIVATED(rovr)) | |
566 | continue; | |
567 | if (!(rovr->tk_flags & RPC_TASK_KILLED)) { | |
568 | rovr->tk_flags |= RPC_TASK_KILLED; | |
569 | rpc_exit(rovr, -EIO); | |
8e26de23 SK |
570 | if (RPC_IS_QUEUED(rovr)) |
571 | rpc_wake_up_queued_task(rovr->tk_waitqueue, | |
572 | rovr); | |
58f9612c TM |
573 | } |
574 | } | |
575 | spin_unlock(&clnt->cl_lock); | |
576 | } | |
577 | EXPORT_SYMBOL_GPL(rpc_killall_tasks); | |
578 | ||
1da177e4 LT |
579 | /* |
580 | * Properly shut down an RPC client, terminating all outstanding | |
90c5755f | 581 | * requests. |
1da177e4 | 582 | */ |
4c402b40 | 583 | void rpc_shutdown_client(struct rpc_clnt *clnt) |
1da177e4 | 584 | { |
4e0038b6 TM |
585 | dprintk_rcu("RPC: shutting down %s client for %s\n", |
586 | clnt->cl_protname, | |
587 | rcu_dereference(clnt->cl_xprt)->servername); | |
1da177e4 | 588 | |
34f52e35 | 589 | while (!list_empty(&clnt->cl_tasks)) { |
1da177e4 | 590 | rpc_killall_tasks(clnt); |
532347e2 | 591 | wait_event_timeout(destroy_wait, |
34f52e35 | 592 | list_empty(&clnt->cl_tasks), 1*HZ); |
1da177e4 LT |
593 | } |
594 | ||
4c402b40 | 595 | rpc_release_client(clnt); |
1da177e4 | 596 | } |
e8914c65 | 597 | EXPORT_SYMBOL_GPL(rpc_shutdown_client); |
1da177e4 LT |
598 | |
599 | /* | |
34f52e35 | 600 | * Free an RPC client |
1da177e4 | 601 | */ |
34f52e35 | 602 | static void |
006abe88 | 603 | rpc_free_client(struct rpc_clnt *clnt) |
1da177e4 | 604 | { |
4e0038b6 TM |
605 | dprintk_rcu("RPC: destroying %s client for %s\n", |
606 | clnt->cl_protname, | |
607 | rcu_dereference(clnt->cl_xprt)->servername); | |
6eac7d3f | 608 | if (clnt->cl_parent != clnt) |
8ad7c892 | 609 | rpc_release_client(clnt->cl_parent); |
6529eba0 | 610 | rpc_unregister_client(clnt); |
f5131257 | 611 | rpc_clnt_remove_pipedir(clnt); |
11c556b3 | 612 | rpc_free_iostats(clnt->cl_metrics); |
608207e8 | 613 | kfree(clnt->cl_principal); |
11c556b3 | 614 | clnt->cl_metrics = NULL; |
2446ab60 | 615 | xprt_put(rcu_dereference_raw(clnt->cl_xprt)); |
4ada539e | 616 | rpciod_down(); |
1da177e4 | 617 | kfree(clnt); |
1da177e4 LT |
618 | } |
619 | ||
1dd17ec6 TM |
620 | /* |
621 | * Free an RPC client | |
622 | */ | |
623 | static void | |
006abe88 | 624 | rpc_free_auth(struct rpc_clnt *clnt) |
1dd17ec6 | 625 | { |
1dd17ec6 | 626 | if (clnt->cl_auth == NULL) { |
006abe88 | 627 | rpc_free_client(clnt); |
1dd17ec6 TM |
628 | return; |
629 | } | |
630 | ||
631 | /* | |
632 | * Note: RPCSEC_GSS may need to send NULL RPC calls in order to | |
633 | * release remaining GSS contexts. This mechanism ensures | |
634 | * that it can do so safely. | |
635 | */ | |
006abe88 | 636 | atomic_inc(&clnt->cl_count); |
1dd17ec6 TM |
637 | rpcauth_release(clnt->cl_auth); |
638 | clnt->cl_auth = NULL; | |
006abe88 TM |
639 | if (atomic_dec_and_test(&clnt->cl_count)) |
640 | rpc_free_client(clnt); | |
1dd17ec6 TM |
641 | } |
642 | ||
1da177e4 | 643 | /* |
34f52e35 | 644 | * Release reference to the RPC client |
1da177e4 LT |
645 | */ |
646 | void | |
647 | rpc_release_client(struct rpc_clnt *clnt) | |
648 | { | |
34f52e35 | 649 | dprintk("RPC: rpc_release_client(%p)\n", clnt); |
1da177e4 | 650 | |
34f52e35 TM |
651 | if (list_empty(&clnt->cl_tasks)) |
652 | wake_up(&destroy_wait); | |
006abe88 TM |
653 | if (atomic_dec_and_test(&clnt->cl_count)) |
654 | rpc_free_auth(clnt); | |
34f52e35 TM |
655 | } |
656 | ||
007e251f AG |
657 | /** |
658 | * rpc_bind_new_program - bind a new RPC program to an existing client | |
65b6e42c RD |
659 | * @old: old rpc_client |
660 | * @program: rpc program to set | |
661 | * @vers: rpc program version | |
007e251f AG |
662 | * |
663 | * Clones the rpc client and sets up a new RPC program. This is mainly | |
664 | * of use for enabling different RPC programs to share the same transport. | |
665 | * The Sun NFSv2/v3 ACL protocol can do this. | |
666 | */ | |
667 | struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old, | |
a613fa16 | 668 | const struct rpc_program *program, |
89eb21c3 | 669 | u32 vers) |
007e251f AG |
670 | { |
671 | struct rpc_clnt *clnt; | |
a613fa16 | 672 | const struct rpc_version *version; |
007e251f AG |
673 | int err; |
674 | ||
675 | BUG_ON(vers >= program->nrvers || !program->version[vers]); | |
676 | version = program->version[vers]; | |
677 | clnt = rpc_clone_client(old); | |
678 | if (IS_ERR(clnt)) | |
679 | goto out; | |
680 | clnt->cl_procinfo = version->procs; | |
681 | clnt->cl_maxproc = version->nrprocs; | |
682 | clnt->cl_protname = program->name; | |
683 | clnt->cl_prog = program->number; | |
684 | clnt->cl_vers = version->number; | |
685 | clnt->cl_stats = program->stats; | |
caabea8a | 686 | err = rpc_ping(clnt); |
007e251f AG |
687 | if (err != 0) { |
688 | rpc_shutdown_client(clnt); | |
689 | clnt = ERR_PTR(err); | |
690 | } | |
cca5172a | 691 | out: |
007e251f AG |
692 | return clnt; |
693 | } | |
e8914c65 | 694 | EXPORT_SYMBOL_GPL(rpc_bind_new_program); |
007e251f | 695 | |
58f9612c TM |
696 | void rpc_task_release_client(struct rpc_task *task) |
697 | { | |
698 | struct rpc_clnt *clnt = task->tk_client; | |
699 | ||
700 | if (clnt != NULL) { | |
701 | /* Remove from client task list */ | |
702 | spin_lock(&clnt->cl_lock); | |
703 | list_del(&task->tk_task); | |
704 | spin_unlock(&clnt->cl_lock); | |
705 | task->tk_client = NULL; | |
706 | ||
707 | rpc_release_client(clnt); | |
708 | } | |
709 | } | |
710 | ||
711 | static | |
712 | void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt) | |
713 | { | |
714 | if (clnt != NULL) { | |
715 | rpc_task_release_client(task); | |
716 | task->tk_client = clnt; | |
006abe88 | 717 | atomic_inc(&clnt->cl_count); |
58f9612c TM |
718 | if (clnt->cl_softrtry) |
719 | task->tk_flags |= RPC_TASK_SOFT; | |
a564b8f0 MG |
720 | if (sk_memalloc_socks()) { |
721 | struct rpc_xprt *xprt; | |
722 | ||
723 | rcu_read_lock(); | |
724 | xprt = rcu_dereference(clnt->cl_xprt); | |
725 | if (xprt->swapper) | |
726 | task->tk_flags |= RPC_TASK_SWAPPER; | |
727 | rcu_read_unlock(); | |
728 | } | |
58f9612c TM |
729 | /* Add to the client's list of all tasks */ |
730 | spin_lock(&clnt->cl_lock); | |
731 | list_add_tail(&task->tk_task, &clnt->cl_tasks); | |
732 | spin_unlock(&clnt->cl_lock); | |
733 | } | |
734 | } | |
735 | ||
cbdabc7f AA |
736 | void rpc_task_reset_client(struct rpc_task *task, struct rpc_clnt *clnt) |
737 | { | |
738 | rpc_task_release_client(task); | |
739 | rpc_task_set_client(task, clnt); | |
740 | } | |
741 | EXPORT_SYMBOL_GPL(rpc_task_reset_client); | |
742 | ||
743 | ||
58f9612c TM |
744 | static void |
745 | rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg) | |
746 | { | |
747 | if (msg != NULL) { | |
748 | task->tk_msg.rpc_proc = msg->rpc_proc; | |
749 | task->tk_msg.rpc_argp = msg->rpc_argp; | |
750 | task->tk_msg.rpc_resp = msg->rpc_resp; | |
a17c2153 TM |
751 | if (msg->rpc_cred != NULL) |
752 | task->tk_msg.rpc_cred = get_rpccred(msg->rpc_cred); | |
58f9612c TM |
753 | } |
754 | } | |
755 | ||
1da177e4 LT |
756 | /* |
757 | * Default callback for async RPC calls | |
758 | */ | |
759 | static void | |
963d8fe5 | 760 | rpc_default_callback(struct rpc_task *task, void *data) |
1da177e4 LT |
761 | { |
762 | } | |
763 | ||
963d8fe5 TM |
764 | static const struct rpc_call_ops rpc_default_ops = { |
765 | .rpc_call_done = rpc_default_callback, | |
766 | }; | |
767 | ||
c970aa85 TM |
768 | /** |
769 | * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it | |
770 | * @task_setup_data: pointer to task initialisation data | |
771 | */ | |
772 | struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data) | |
6e5b70e9 | 773 | { |
19445b99 | 774 | struct rpc_task *task; |
6e5b70e9 | 775 | |
84115e1c | 776 | task = rpc_new_task(task_setup_data); |
19445b99 | 777 | if (IS_ERR(task)) |
50859259 | 778 | goto out; |
6e5b70e9 | 779 | |
58f9612c TM |
780 | rpc_task_set_client(task, task_setup_data->rpc_client); |
781 | rpc_task_set_rpc_message(task, task_setup_data->rpc_message); | |
782 | ||
58f9612c TM |
783 | if (task->tk_action == NULL) |
784 | rpc_call_start(task); | |
785 | ||
6e5b70e9 TM |
786 | atomic_inc(&task->tk_count); |
787 | rpc_execute(task); | |
6e5b70e9 | 788 | out: |
19445b99 | 789 | return task; |
6e5b70e9 | 790 | } |
c970aa85 | 791 | EXPORT_SYMBOL_GPL(rpc_run_task); |
6e5b70e9 TM |
792 | |
793 | /** | |
794 | * rpc_call_sync - Perform a synchronous RPC call | |
795 | * @clnt: pointer to RPC client | |
796 | * @msg: RPC call parameters | |
797 | * @flags: RPC call flags | |
1da177e4 | 798 | */ |
cbc20059 | 799 | int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags) |
1da177e4 LT |
800 | { |
801 | struct rpc_task *task; | |
84115e1c TM |
802 | struct rpc_task_setup task_setup_data = { |
803 | .rpc_client = clnt, | |
804 | .rpc_message = msg, | |
805 | .callback_ops = &rpc_default_ops, | |
806 | .flags = flags, | |
807 | }; | |
6e5b70e9 | 808 | int status; |
1da177e4 | 809 | |
1da177e4 LT |
810 | BUG_ON(flags & RPC_TASK_ASYNC); |
811 | ||
c970aa85 | 812 | task = rpc_run_task(&task_setup_data); |
6e5b70e9 TM |
813 | if (IS_ERR(task)) |
814 | return PTR_ERR(task); | |
e60859ac | 815 | status = task->tk_status; |
bde8f00c | 816 | rpc_put_task(task); |
1da177e4 LT |
817 | return status; |
818 | } | |
e8914c65 | 819 | EXPORT_SYMBOL_GPL(rpc_call_sync); |
1da177e4 | 820 | |
6e5b70e9 TM |
821 | /** |
822 | * rpc_call_async - Perform an asynchronous RPC call | |
823 | * @clnt: pointer to RPC client | |
824 | * @msg: RPC call parameters | |
825 | * @flags: RPC call flags | |
65b6e42c | 826 | * @tk_ops: RPC call ops |
6e5b70e9 | 827 | * @data: user call data |
1da177e4 LT |
828 | */ |
829 | int | |
cbc20059 | 830 | rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags, |
963d8fe5 | 831 | const struct rpc_call_ops *tk_ops, void *data) |
1da177e4 LT |
832 | { |
833 | struct rpc_task *task; | |
84115e1c TM |
834 | struct rpc_task_setup task_setup_data = { |
835 | .rpc_client = clnt, | |
836 | .rpc_message = msg, | |
837 | .callback_ops = tk_ops, | |
838 | .callback_data = data, | |
839 | .flags = flags|RPC_TASK_ASYNC, | |
840 | }; | |
1da177e4 | 841 | |
c970aa85 | 842 | task = rpc_run_task(&task_setup_data); |
6e5b70e9 TM |
843 | if (IS_ERR(task)) |
844 | return PTR_ERR(task); | |
845 | rpc_put_task(task); | |
846 | return 0; | |
1da177e4 | 847 | } |
e8914c65 | 848 | EXPORT_SYMBOL_GPL(rpc_call_async); |
1da177e4 | 849 | |
9e00abc3 | 850 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
55ae1aab RL |
851 | /** |
852 | * rpc_run_bc_task - Allocate a new RPC task for backchannel use, then run | |
853 | * rpc_execute against it | |
7a73fdde JSR |
854 | * @req: RPC request |
855 | * @tk_ops: RPC call ops | |
55ae1aab RL |
856 | */ |
857 | struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req, | |
7a73fdde | 858 | const struct rpc_call_ops *tk_ops) |
55ae1aab RL |
859 | { |
860 | struct rpc_task *task; | |
861 | struct xdr_buf *xbufp = &req->rq_snd_buf; | |
862 | struct rpc_task_setup task_setup_data = { | |
863 | .callback_ops = tk_ops, | |
864 | }; | |
865 | ||
866 | dprintk("RPC: rpc_run_bc_task req= %p\n", req); | |
867 | /* | |
868 | * Create an rpc_task to send the data | |
869 | */ | |
870 | task = rpc_new_task(&task_setup_data); | |
19445b99 | 871 | if (IS_ERR(task)) { |
55ae1aab RL |
872 | xprt_free_bc_request(req); |
873 | goto out; | |
874 | } | |
875 | task->tk_rqstp = req; | |
876 | ||
877 | /* | |
878 | * Set up the xdr_buf length. | |
879 | * This also indicates that the buffer is XDR encoded already. | |
880 | */ | |
881 | xbufp->len = xbufp->head[0].iov_len + xbufp->page_len + | |
882 | xbufp->tail[0].iov_len; | |
883 | ||
884 | task->tk_action = call_bc_transmit; | |
885 | atomic_inc(&task->tk_count); | |
886 | BUG_ON(atomic_read(&task->tk_count) != 2); | |
887 | rpc_execute(task); | |
888 | ||
889 | out: | |
890 | dprintk("RPC: rpc_run_bc_task: task= %p\n", task); | |
891 | return task; | |
892 | } | |
9e00abc3 | 893 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
55ae1aab | 894 | |
77de2c59 TM |
895 | void |
896 | rpc_call_start(struct rpc_task *task) | |
897 | { | |
898 | task->tk_action = call_start; | |
899 | } | |
900 | EXPORT_SYMBOL_GPL(rpc_call_start); | |
901 | ||
ed39440a CL |
902 | /** |
903 | * rpc_peeraddr - extract remote peer address from clnt's xprt | |
904 | * @clnt: RPC client structure | |
905 | * @buf: target buffer | |
65b6e42c | 906 | * @bufsize: length of target buffer |
ed39440a CL |
907 | * |
908 | * Returns the number of bytes that are actually in the stored address. | |
909 | */ | |
910 | size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize) | |
911 | { | |
912 | size_t bytes; | |
2446ab60 TM |
913 | struct rpc_xprt *xprt; |
914 | ||
915 | rcu_read_lock(); | |
916 | xprt = rcu_dereference(clnt->cl_xprt); | |
ed39440a | 917 | |
2446ab60 | 918 | bytes = xprt->addrlen; |
ed39440a CL |
919 | if (bytes > bufsize) |
920 | bytes = bufsize; | |
2446ab60 TM |
921 | memcpy(buf, &xprt->addr, bytes); |
922 | rcu_read_unlock(); | |
923 | ||
924 | return bytes; | |
ed39440a | 925 | } |
b86acd50 | 926 | EXPORT_SYMBOL_GPL(rpc_peeraddr); |
ed39440a | 927 | |
f425eba4 CL |
928 | /** |
929 | * rpc_peeraddr2str - return remote peer address in printable format | |
930 | * @clnt: RPC client structure | |
931 | * @format: address format | |
932 | * | |
2446ab60 TM |
933 | * NB: the lifetime of the memory referenced by the returned pointer is |
934 | * the same as the rpc_xprt itself. As long as the caller uses this | |
935 | * pointer, it must hold the RCU read lock. | |
f425eba4 | 936 | */ |
b454ae90 CL |
937 | const char *rpc_peeraddr2str(struct rpc_clnt *clnt, |
938 | enum rpc_display_format_t format) | |
f425eba4 | 939 | { |
2446ab60 TM |
940 | struct rpc_xprt *xprt; |
941 | ||
942 | xprt = rcu_dereference(clnt->cl_xprt); | |
7559c7a2 CL |
943 | |
944 | if (xprt->address_strings[format] != NULL) | |
945 | return xprt->address_strings[format]; | |
946 | else | |
947 | return "unprintable"; | |
f425eba4 | 948 | } |
b86acd50 | 949 | EXPORT_SYMBOL_GPL(rpc_peeraddr2str); |
f425eba4 | 950 | |
2e738fdc CL |
951 | static const struct sockaddr_in rpc_inaddr_loopback = { |
952 | .sin_family = AF_INET, | |
953 | .sin_addr.s_addr = htonl(INADDR_ANY), | |
954 | }; | |
955 | ||
956 | static const struct sockaddr_in6 rpc_in6addr_loopback = { | |
957 | .sin6_family = AF_INET6, | |
958 | .sin6_addr = IN6ADDR_ANY_INIT, | |
959 | }; | |
960 | ||
961 | /* | |
962 | * Try a getsockname() on a connected datagram socket. Using a | |
963 | * connected datagram socket prevents leaving a socket in TIME_WAIT. | |
964 | * This conserves the ephemeral port number space. | |
965 | * | |
966 | * Returns zero and fills in "buf" if successful; otherwise, a | |
967 | * negative errno is returned. | |
968 | */ | |
969 | static int rpc_sockname(struct net *net, struct sockaddr *sap, size_t salen, | |
970 | struct sockaddr *buf, int buflen) | |
971 | { | |
972 | struct socket *sock; | |
973 | int err; | |
974 | ||
975 | err = __sock_create(net, sap->sa_family, | |
976 | SOCK_DGRAM, IPPROTO_UDP, &sock, 1); | |
977 | if (err < 0) { | |
978 | dprintk("RPC: can't create UDP socket (%d)\n", err); | |
979 | goto out; | |
980 | } | |
981 | ||
982 | switch (sap->sa_family) { | |
983 | case AF_INET: | |
984 | err = kernel_bind(sock, | |
985 | (struct sockaddr *)&rpc_inaddr_loopback, | |
986 | sizeof(rpc_inaddr_loopback)); | |
987 | break; | |
988 | case AF_INET6: | |
989 | err = kernel_bind(sock, | |
990 | (struct sockaddr *)&rpc_in6addr_loopback, | |
991 | sizeof(rpc_in6addr_loopback)); | |
992 | break; | |
993 | default: | |
994 | err = -EAFNOSUPPORT; | |
995 | goto out; | |
996 | } | |
997 | if (err < 0) { | |
998 | dprintk("RPC: can't bind UDP socket (%d)\n", err); | |
999 | goto out_release; | |
1000 | } | |
1001 | ||
1002 | err = kernel_connect(sock, sap, salen, 0); | |
1003 | if (err < 0) { | |
1004 | dprintk("RPC: can't connect UDP socket (%d)\n", err); | |
1005 | goto out_release; | |
1006 | } | |
1007 | ||
1008 | err = kernel_getsockname(sock, buf, &buflen); | |
1009 | if (err < 0) { | |
1010 | dprintk("RPC: getsockname failed (%d)\n", err); | |
1011 | goto out_release; | |
1012 | } | |
1013 | ||
1014 | err = 0; | |
1015 | if (buf->sa_family == AF_INET6) { | |
1016 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)buf; | |
1017 | sin6->sin6_scope_id = 0; | |
1018 | } | |
1019 | dprintk("RPC: %s succeeded\n", __func__); | |
1020 | ||
1021 | out_release: | |
1022 | sock_release(sock); | |
1023 | out: | |
1024 | return err; | |
1025 | } | |
1026 | ||
1027 | /* | |
1028 | * Scraping a connected socket failed, so we don't have a useable | |
1029 | * local address. Fallback: generate an address that will prevent | |
1030 | * the server from calling us back. | |
1031 | * | |
1032 | * Returns zero and fills in "buf" if successful; otherwise, a | |
1033 | * negative errno is returned. | |
1034 | */ | |
1035 | static int rpc_anyaddr(int family, struct sockaddr *buf, size_t buflen) | |
1036 | { | |
1037 | switch (family) { | |
1038 | case AF_INET: | |
1039 | if (buflen < sizeof(rpc_inaddr_loopback)) | |
1040 | return -EINVAL; | |
1041 | memcpy(buf, &rpc_inaddr_loopback, | |
1042 | sizeof(rpc_inaddr_loopback)); | |
1043 | break; | |
1044 | case AF_INET6: | |
1045 | if (buflen < sizeof(rpc_in6addr_loopback)) | |
1046 | return -EINVAL; | |
1047 | memcpy(buf, &rpc_in6addr_loopback, | |
1048 | sizeof(rpc_in6addr_loopback)); | |
1049 | default: | |
1050 | dprintk("RPC: %s: address family not supported\n", | |
1051 | __func__); | |
1052 | return -EAFNOSUPPORT; | |
1053 | } | |
1054 | dprintk("RPC: %s: succeeded\n", __func__); | |
1055 | return 0; | |
1056 | } | |
1057 | ||
1058 | /** | |
1059 | * rpc_localaddr - discover local endpoint address for an RPC client | |
1060 | * @clnt: RPC client structure | |
1061 | * @buf: target buffer | |
1062 | * @buflen: size of target buffer, in bytes | |
1063 | * | |
1064 | * Returns zero and fills in "buf" and "buflen" if successful; | |
1065 | * otherwise, a negative errno is returned. | |
1066 | * | |
1067 | * This works even if the underlying transport is not currently connected, | |
1068 | * or if the upper layer never previously provided a source address. | |
1069 | * | |
1070 | * The result of this function call is transient: multiple calls in | |
1071 | * succession may give different results, depending on how local | |
1072 | * networking configuration changes over time. | |
1073 | */ | |
1074 | int rpc_localaddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t buflen) | |
1075 | { | |
1076 | struct sockaddr_storage address; | |
1077 | struct sockaddr *sap = (struct sockaddr *)&address; | |
1078 | struct rpc_xprt *xprt; | |
1079 | struct net *net; | |
1080 | size_t salen; | |
1081 | int err; | |
1082 | ||
1083 | rcu_read_lock(); | |
1084 | xprt = rcu_dereference(clnt->cl_xprt); | |
1085 | salen = xprt->addrlen; | |
1086 | memcpy(sap, &xprt->addr, salen); | |
1087 | net = get_net(xprt->xprt_net); | |
1088 | rcu_read_unlock(); | |
1089 | ||
1090 | rpc_set_port(sap, 0); | |
1091 | err = rpc_sockname(net, sap, salen, buf, buflen); | |
1092 | put_net(net); | |
1093 | if (err != 0) | |
1094 | /* Couldn't discover local address, return ANYADDR */ | |
1095 | return rpc_anyaddr(sap->sa_family, buf, buflen); | |
1096 | return 0; | |
1097 | } | |
1098 | EXPORT_SYMBOL_GPL(rpc_localaddr); | |
1099 | ||
1da177e4 LT |
1100 | void |
1101 | rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize) | |
1102 | { | |
2446ab60 TM |
1103 | struct rpc_xprt *xprt; |
1104 | ||
1105 | rcu_read_lock(); | |
1106 | xprt = rcu_dereference(clnt->cl_xprt); | |
470056c2 CL |
1107 | if (xprt->ops->set_buffer_size) |
1108 | xprt->ops->set_buffer_size(xprt, sndsize, rcvsize); | |
2446ab60 | 1109 | rcu_read_unlock(); |
1da177e4 | 1110 | } |
e8914c65 | 1111 | EXPORT_SYMBOL_GPL(rpc_setbufsize); |
1da177e4 | 1112 | |
2446ab60 TM |
1113 | /** |
1114 | * rpc_protocol - Get transport protocol number for an RPC client | |
1115 | * @clnt: RPC client to query | |
1116 | * | |
1117 | */ | |
1118 | int rpc_protocol(struct rpc_clnt *clnt) | |
1119 | { | |
1120 | int protocol; | |
1121 | ||
1122 | rcu_read_lock(); | |
1123 | protocol = rcu_dereference(clnt->cl_xprt)->prot; | |
1124 | rcu_read_unlock(); | |
1125 | return protocol; | |
1126 | } | |
1127 | EXPORT_SYMBOL_GPL(rpc_protocol); | |
1128 | ||
1129 | /** | |
1130 | * rpc_net_ns - Get the network namespace for this RPC client | |
1131 | * @clnt: RPC client to query | |
1132 | * | |
1133 | */ | |
1134 | struct net *rpc_net_ns(struct rpc_clnt *clnt) | |
1135 | { | |
1136 | struct net *ret; | |
1137 | ||
1138 | rcu_read_lock(); | |
1139 | ret = rcu_dereference(clnt->cl_xprt)->xprt_net; | |
1140 | rcu_read_unlock(); | |
1141 | return ret; | |
1142 | } | |
1143 | EXPORT_SYMBOL_GPL(rpc_net_ns); | |
1144 | ||
1145 | /** | |
1146 | * rpc_max_payload - Get maximum payload size for a transport, in bytes | |
1147 | * @clnt: RPC client to query | |
1da177e4 LT |
1148 | * |
1149 | * For stream transports, this is one RPC record fragment (see RFC | |
1150 | * 1831), as we don't support multi-record requests yet. For datagram | |
1151 | * transports, this is the size of an IP packet minus the IP, UDP, and | |
1152 | * RPC header sizes. | |
1153 | */ | |
1154 | size_t rpc_max_payload(struct rpc_clnt *clnt) | |
1155 | { | |
2446ab60 TM |
1156 | size_t ret; |
1157 | ||
1158 | rcu_read_lock(); | |
1159 | ret = rcu_dereference(clnt->cl_xprt)->max_payload; | |
1160 | rcu_read_unlock(); | |
1161 | return ret; | |
1da177e4 | 1162 | } |
b86acd50 | 1163 | EXPORT_SYMBOL_GPL(rpc_max_payload); |
1da177e4 | 1164 | |
35f5a422 CL |
1165 | /** |
1166 | * rpc_force_rebind - force transport to check that remote port is unchanged | |
1167 | * @clnt: client to rebind | |
1168 | * | |
1169 | */ | |
1170 | void rpc_force_rebind(struct rpc_clnt *clnt) | |
1171 | { | |
2446ab60 TM |
1172 | if (clnt->cl_autobind) { |
1173 | rcu_read_lock(); | |
1174 | xprt_clear_bound(rcu_dereference(clnt->cl_xprt)); | |
1175 | rcu_read_unlock(); | |
1176 | } | |
35f5a422 | 1177 | } |
b86acd50 | 1178 | EXPORT_SYMBOL_GPL(rpc_force_rebind); |
35f5a422 | 1179 | |
aae2006e AA |
1180 | /* |
1181 | * Restart an (async) RPC call from the call_prepare state. | |
1182 | * Usually called from within the exit handler. | |
1183 | */ | |
f1f88fc7 | 1184 | int |
aae2006e AA |
1185 | rpc_restart_call_prepare(struct rpc_task *task) |
1186 | { | |
1187 | if (RPC_ASSASSINATED(task)) | |
f1f88fc7 | 1188 | return 0; |
d00c5d43 TM |
1189 | task->tk_action = call_start; |
1190 | if (task->tk_ops->rpc_call_prepare != NULL) | |
1191 | task->tk_action = rpc_prepare_task; | |
f1f88fc7 | 1192 | return 1; |
aae2006e AA |
1193 | } |
1194 | EXPORT_SYMBOL_GPL(rpc_restart_call_prepare); | |
1195 | ||
1da177e4 LT |
1196 | /* |
1197 | * Restart an (async) RPC call. Usually called from within the | |
1198 | * exit handler. | |
1199 | */ | |
f1f88fc7 | 1200 | int |
1da177e4 LT |
1201 | rpc_restart_call(struct rpc_task *task) |
1202 | { | |
1203 | if (RPC_ASSASSINATED(task)) | |
f1f88fc7 | 1204 | return 0; |
1da177e4 | 1205 | task->tk_action = call_start; |
f1f88fc7 | 1206 | return 1; |
1da177e4 | 1207 | } |
e8914c65 | 1208 | EXPORT_SYMBOL_GPL(rpc_restart_call); |
1da177e4 | 1209 | |
3748f1e4 CL |
1210 | #ifdef RPC_DEBUG |
1211 | static const char *rpc_proc_name(const struct rpc_task *task) | |
1212 | { | |
1213 | const struct rpc_procinfo *proc = task->tk_msg.rpc_proc; | |
1214 | ||
1215 | if (proc) { | |
1216 | if (proc->p_name) | |
1217 | return proc->p_name; | |
1218 | else | |
1219 | return "NULL"; | |
1220 | } else | |
1221 | return "no proc"; | |
1222 | } | |
1223 | #endif | |
1224 | ||
1da177e4 LT |
1225 | /* |
1226 | * 0. Initial state | |
1227 | * | |
1228 | * Other FSM states can be visited zero or more times, but | |
1229 | * this state is visited exactly once for each RPC. | |
1230 | */ | |
1231 | static void | |
1232 | call_start(struct rpc_task *task) | |
1233 | { | |
1234 | struct rpc_clnt *clnt = task->tk_client; | |
1235 | ||
3748f1e4 | 1236 | dprintk("RPC: %5u call_start %s%d proc %s (%s)\n", task->tk_pid, |
46121cf7 | 1237 | clnt->cl_protname, clnt->cl_vers, |
3748f1e4 | 1238 | rpc_proc_name(task), |
46121cf7 | 1239 | (RPC_IS_ASYNC(task) ? "async" : "sync")); |
1da177e4 LT |
1240 | |
1241 | /* Increment call count */ | |
1242 | task->tk_msg.rpc_proc->p_count++; | |
1243 | clnt->cl_stats->rpccnt++; | |
1244 | task->tk_action = call_reserve; | |
1245 | } | |
1246 | ||
1247 | /* | |
1248 | * 1. Reserve an RPC call slot | |
1249 | */ | |
1250 | static void | |
1251 | call_reserve(struct rpc_task *task) | |
1252 | { | |
46121cf7 | 1253 | dprint_status(task); |
1da177e4 | 1254 | |
1da177e4 LT |
1255 | task->tk_status = 0; |
1256 | task->tk_action = call_reserveresult; | |
1257 | xprt_reserve(task); | |
1258 | } | |
1259 | ||
1260 | /* | |
1261 | * 1b. Grok the result of xprt_reserve() | |
1262 | */ | |
1263 | static void | |
1264 | call_reserveresult(struct rpc_task *task) | |
1265 | { | |
1266 | int status = task->tk_status; | |
1267 | ||
46121cf7 | 1268 | dprint_status(task); |
1da177e4 LT |
1269 | |
1270 | /* | |
1271 | * After a call to xprt_reserve(), we must have either | |
1272 | * a request slot or else an error status. | |
1273 | */ | |
1274 | task->tk_status = 0; | |
1275 | if (status >= 0) { | |
1276 | if (task->tk_rqstp) { | |
f2d47d02 | 1277 | task->tk_action = call_refresh; |
1da177e4 LT |
1278 | return; |
1279 | } | |
1280 | ||
1281 | printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n", | |
0dc47877 | 1282 | __func__, status); |
1da177e4 LT |
1283 | rpc_exit(task, -EIO); |
1284 | return; | |
1285 | } | |
1286 | ||
1287 | /* | |
1288 | * Even though there was an error, we may have acquired | |
1289 | * a request slot somehow. Make sure not to leak it. | |
1290 | */ | |
1291 | if (task->tk_rqstp) { | |
1292 | printk(KERN_ERR "%s: status=%d, request allocated anyway\n", | |
0dc47877 | 1293 | __func__, status); |
1da177e4 LT |
1294 | xprt_release(task); |
1295 | } | |
1296 | ||
1297 | switch (status) { | |
1afeaf5c TM |
1298 | case -ENOMEM: |
1299 | rpc_delay(task, HZ >> 2); | |
1da177e4 LT |
1300 | case -EAGAIN: /* woken up; retry */ |
1301 | task->tk_action = call_reserve; | |
1302 | return; | |
1303 | case -EIO: /* probably a shutdown */ | |
1304 | break; | |
1305 | default: | |
1306 | printk(KERN_ERR "%s: unrecognized error %d, exiting\n", | |
0dc47877 | 1307 | __func__, status); |
1da177e4 LT |
1308 | break; |
1309 | } | |
1310 | rpc_exit(task, status); | |
1311 | } | |
1312 | ||
1313 | /* | |
55576244 BF |
1314 | * 2. Bind and/or refresh the credentials |
1315 | */ | |
1316 | static void | |
1317 | call_refresh(struct rpc_task *task) | |
1318 | { | |
1319 | dprint_status(task); | |
1320 | ||
1321 | task->tk_action = call_refreshresult; | |
1322 | task->tk_status = 0; | |
1323 | task->tk_client->cl_stats->rpcauthrefresh++; | |
1324 | rpcauth_refreshcred(task); | |
1325 | } | |
1326 | ||
1327 | /* | |
1328 | * 2a. Process the results of a credential refresh | |
1329 | */ | |
1330 | static void | |
1331 | call_refreshresult(struct rpc_task *task) | |
1332 | { | |
1333 | int status = task->tk_status; | |
1334 | ||
1335 | dprint_status(task); | |
1336 | ||
1337 | task->tk_status = 0; | |
5fc43978 | 1338 | task->tk_action = call_refresh; |
55576244 | 1339 | switch (status) { |
5fc43978 TM |
1340 | case 0: |
1341 | if (rpcauth_uptodatecred(task)) | |
1342 | task->tk_action = call_allocate; | |
55576244 BF |
1343 | return; |
1344 | case -ETIMEDOUT: | |
1345 | rpc_delay(task, 3*HZ); | |
5fc43978 TM |
1346 | case -EAGAIN: |
1347 | status = -EACCES; | |
1348 | if (!task->tk_cred_retry) | |
1349 | break; | |
1350 | task->tk_cred_retry--; | |
1351 | dprintk("RPC: %5u %s: retry refresh creds\n", | |
1352 | task->tk_pid, __func__); | |
1353 | return; | |
55576244 | 1354 | } |
5fc43978 TM |
1355 | dprintk("RPC: %5u %s: refresh creds failed with error %d\n", |
1356 | task->tk_pid, __func__, status); | |
1357 | rpc_exit(task, status); | |
55576244 BF |
1358 | } |
1359 | ||
1360 | /* | |
1361 | * 2b. Allocate the buffer. For details, see sched.c:rpc_malloc. | |
02107148 | 1362 | * (Note: buffer memory is freed in xprt_release). |
1da177e4 LT |
1363 | */ |
1364 | static void | |
1365 | call_allocate(struct rpc_task *task) | |
1366 | { | |
f2d47d02 | 1367 | unsigned int slack = task->tk_rqstp->rq_cred->cr_auth->au_cslack; |
02107148 CL |
1368 | struct rpc_rqst *req = task->tk_rqstp; |
1369 | struct rpc_xprt *xprt = task->tk_xprt; | |
2bea90d4 | 1370 | struct rpc_procinfo *proc = task->tk_msg.rpc_proc; |
1da177e4 | 1371 | |
46121cf7 CL |
1372 | dprint_status(task); |
1373 | ||
2bea90d4 | 1374 | task->tk_status = 0; |
f2d47d02 | 1375 | task->tk_action = call_bind; |
2bea90d4 | 1376 | |
02107148 | 1377 | if (req->rq_buffer) |
1da177e4 LT |
1378 | return; |
1379 | ||
2bea90d4 CL |
1380 | if (proc->p_proc != 0) { |
1381 | BUG_ON(proc->p_arglen == 0); | |
1382 | if (proc->p_decode != NULL) | |
1383 | BUG_ON(proc->p_replen == 0); | |
1384 | } | |
1da177e4 | 1385 | |
2bea90d4 CL |
1386 | /* |
1387 | * Calculate the size (in quads) of the RPC call | |
1388 | * and reply headers, and convert both values | |
1389 | * to byte sizes. | |
1390 | */ | |
1391 | req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen; | |
1392 | req->rq_callsize <<= 2; | |
1393 | req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen; | |
1394 | req->rq_rcvsize <<= 2; | |
1395 | ||
c5a4dd8b CL |
1396 | req->rq_buffer = xprt->ops->buf_alloc(task, |
1397 | req->rq_callsize + req->rq_rcvsize); | |
2bea90d4 | 1398 | if (req->rq_buffer != NULL) |
1da177e4 | 1399 | return; |
46121cf7 CL |
1400 | |
1401 | dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid); | |
1da177e4 | 1402 | |
5afa9133 | 1403 | if (RPC_IS_ASYNC(task) || !fatal_signal_pending(current)) { |
b6e9c713 | 1404 | task->tk_action = call_allocate; |
1da177e4 LT |
1405 | rpc_delay(task, HZ>>4); |
1406 | return; | |
1407 | } | |
1408 | ||
1409 | rpc_exit(task, -ERESTARTSYS); | |
1410 | } | |
1411 | ||
940e3318 TM |
1412 | static inline int |
1413 | rpc_task_need_encode(struct rpc_task *task) | |
1414 | { | |
1415 | return task->tk_rqstp->rq_snd_buf.len == 0; | |
1416 | } | |
1417 | ||
1418 | static inline void | |
1419 | rpc_task_force_reencode(struct rpc_task *task) | |
1420 | { | |
1421 | task->tk_rqstp->rq_snd_buf.len = 0; | |
2574cc9f | 1422 | task->tk_rqstp->rq_bytes_sent = 0; |
940e3318 TM |
1423 | } |
1424 | ||
2bea90d4 CL |
1425 | static inline void |
1426 | rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len) | |
1427 | { | |
1428 | buf->head[0].iov_base = start; | |
1429 | buf->head[0].iov_len = len; | |
1430 | buf->tail[0].iov_len = 0; | |
1431 | buf->page_len = 0; | |
4f22ccc3 | 1432 | buf->flags = 0; |
2bea90d4 CL |
1433 | buf->len = 0; |
1434 | buf->buflen = len; | |
1435 | } | |
1436 | ||
1da177e4 LT |
1437 | /* |
1438 | * 3. Encode arguments of an RPC call | |
1439 | */ | |
1440 | static void | |
b0e1c57e | 1441 | rpc_xdr_encode(struct rpc_task *task) |
1da177e4 | 1442 | { |
1da177e4 | 1443 | struct rpc_rqst *req = task->tk_rqstp; |
9f06c719 | 1444 | kxdreproc_t encode; |
d8ed029d | 1445 | __be32 *p; |
1da177e4 | 1446 | |
46121cf7 | 1447 | dprint_status(task); |
1da177e4 | 1448 | |
2bea90d4 CL |
1449 | rpc_xdr_buf_init(&req->rq_snd_buf, |
1450 | req->rq_buffer, | |
1451 | req->rq_callsize); | |
1452 | rpc_xdr_buf_init(&req->rq_rcv_buf, | |
1453 | (char *)req->rq_buffer + req->rq_callsize, | |
1454 | req->rq_rcvsize); | |
1da177e4 | 1455 | |
b0e1c57e CL |
1456 | p = rpc_encode_header(task); |
1457 | if (p == NULL) { | |
1458 | printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n"); | |
1da177e4 LT |
1459 | rpc_exit(task, -EIO); |
1460 | return; | |
1461 | } | |
b0e1c57e CL |
1462 | |
1463 | encode = task->tk_msg.rpc_proc->p_encode; | |
f3680312 BF |
1464 | if (encode == NULL) |
1465 | return; | |
1466 | ||
1467 | task->tk_status = rpcauth_wrap_req(task, encode, req, p, | |
1468 | task->tk_msg.rpc_argp); | |
1da177e4 LT |
1469 | } |
1470 | ||
1471 | /* | |
1472 | * 4. Get the server port number if not yet set | |
1473 | */ | |
1474 | static void | |
1475 | call_bind(struct rpc_task *task) | |
1476 | { | |
ec739ef0 | 1477 | struct rpc_xprt *xprt = task->tk_xprt; |
1da177e4 | 1478 | |
46121cf7 | 1479 | dprint_status(task); |
1da177e4 | 1480 | |
da351878 | 1481 | task->tk_action = call_connect; |
ec739ef0 | 1482 | if (!xprt_bound(xprt)) { |
da351878 | 1483 | task->tk_action = call_bind_status; |
ec739ef0 | 1484 | task->tk_timeout = xprt->bind_timeout; |
bbf7c1dd | 1485 | xprt->ops->rpcbind(task); |
1da177e4 LT |
1486 | } |
1487 | } | |
1488 | ||
1489 | /* | |
da351878 CL |
1490 | * 4a. Sort out bind result |
1491 | */ | |
1492 | static void | |
1493 | call_bind_status(struct rpc_task *task) | |
1494 | { | |
906462af | 1495 | int status = -EIO; |
da351878 CL |
1496 | |
1497 | if (task->tk_status >= 0) { | |
46121cf7 | 1498 | dprint_status(task); |
da351878 CL |
1499 | task->tk_status = 0; |
1500 | task->tk_action = call_connect; | |
1501 | return; | |
1502 | } | |
1503 | ||
5753cba1 | 1504 | trace_rpc_bind_status(task); |
da351878 | 1505 | switch (task->tk_status) { |
381ba74a TM |
1506 | case -ENOMEM: |
1507 | dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid); | |
1508 | rpc_delay(task, HZ >> 2); | |
2429cbf6 | 1509 | goto retry_timeout; |
da351878 | 1510 | case -EACCES: |
46121cf7 CL |
1511 | dprintk("RPC: %5u remote rpcbind: RPC program/version " |
1512 | "unavailable\n", task->tk_pid); | |
b79dc8ce CL |
1513 | /* fail immediately if this is an RPC ping */ |
1514 | if (task->tk_msg.rpc_proc->p_proc == 0) { | |
1515 | status = -EOPNOTSUPP; | |
1516 | break; | |
1517 | } | |
0b760113 TM |
1518 | if (task->tk_rebind_retry == 0) |
1519 | break; | |
1520 | task->tk_rebind_retry--; | |
ea635a51 | 1521 | rpc_delay(task, 3*HZ); |
da45828e | 1522 | goto retry_timeout; |
da351878 | 1523 | case -ETIMEDOUT: |
46121cf7 | 1524 | dprintk("RPC: %5u rpcbind request timed out\n", |
da351878 | 1525 | task->tk_pid); |
da45828e | 1526 | goto retry_timeout; |
da351878 | 1527 | case -EPFNOSUPPORT: |
906462af | 1528 | /* server doesn't support any rpcbind version we know of */ |
012da158 | 1529 | dprintk("RPC: %5u unrecognized remote rpcbind service\n", |
da351878 CL |
1530 | task->tk_pid); |
1531 | break; | |
1532 | case -EPROTONOSUPPORT: | |
00a6e7bb | 1533 | dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n", |
da351878 | 1534 | task->tk_pid); |
00a6e7bb CL |
1535 | task->tk_status = 0; |
1536 | task->tk_action = call_bind; | |
1537 | return; | |
012da158 CL |
1538 | case -ECONNREFUSED: /* connection problems */ |
1539 | case -ECONNRESET: | |
1540 | case -ENOTCONN: | |
1541 | case -EHOSTDOWN: | |
1542 | case -EHOSTUNREACH: | |
1543 | case -ENETUNREACH: | |
1544 | case -EPIPE: | |
1545 | dprintk("RPC: %5u remote rpcbind unreachable: %d\n", | |
1546 | task->tk_pid, task->tk_status); | |
1547 | if (!RPC_IS_SOFTCONN(task)) { | |
1548 | rpc_delay(task, 5*HZ); | |
1549 | goto retry_timeout; | |
1550 | } | |
1551 | status = task->tk_status; | |
1552 | break; | |
da351878 | 1553 | default: |
46121cf7 | 1554 | dprintk("RPC: %5u unrecognized rpcbind error (%d)\n", |
da351878 | 1555 | task->tk_pid, -task->tk_status); |
da351878 CL |
1556 | } |
1557 | ||
1558 | rpc_exit(task, status); | |
1559 | return; | |
1560 | ||
da45828e TM |
1561 | retry_timeout: |
1562 | task->tk_action = call_timeout; | |
da351878 CL |
1563 | } |
1564 | ||
1565 | /* | |
1566 | * 4b. Connect to the RPC server | |
1da177e4 LT |
1567 | */ |
1568 | static void | |
1569 | call_connect(struct rpc_task *task) | |
1570 | { | |
da351878 | 1571 | struct rpc_xprt *xprt = task->tk_xprt; |
1da177e4 | 1572 | |
46121cf7 | 1573 | dprintk("RPC: %5u call_connect xprt %p %s connected\n", |
da351878 CL |
1574 | task->tk_pid, xprt, |
1575 | (xprt_connected(xprt) ? "is" : "is not")); | |
1da177e4 | 1576 | |
da351878 CL |
1577 | task->tk_action = call_transmit; |
1578 | if (!xprt_connected(xprt)) { | |
1579 | task->tk_action = call_connect_status; | |
1580 | if (task->tk_status < 0) | |
1581 | return; | |
1582 | xprt_connect(task); | |
1da177e4 | 1583 | } |
1da177e4 LT |
1584 | } |
1585 | ||
1586 | /* | |
da351878 | 1587 | * 4c. Sort out connect result |
1da177e4 LT |
1588 | */ |
1589 | static void | |
1590 | call_connect_status(struct rpc_task *task) | |
1591 | { | |
1592 | struct rpc_clnt *clnt = task->tk_client; | |
1593 | int status = task->tk_status; | |
1594 | ||
46121cf7 | 1595 | dprint_status(task); |
da351878 | 1596 | |
1da177e4 | 1597 | task->tk_status = 0; |
2a491991 | 1598 | if (status >= 0 || status == -EAGAIN) { |
1da177e4 LT |
1599 | clnt->cl_stats->netreconn++; |
1600 | task->tk_action = call_transmit; | |
1601 | return; | |
1602 | } | |
1603 | ||
5753cba1 | 1604 | trace_rpc_connect_status(task, status); |
1da177e4 | 1605 | switch (status) { |
da45828e TM |
1606 | /* if soft mounted, test if we've timed out */ |
1607 | case -ETIMEDOUT: | |
1608 | task->tk_action = call_timeout; | |
2a491991 TM |
1609 | break; |
1610 | default: | |
1611 | rpc_exit(task, -EIO); | |
1da177e4 LT |
1612 | } |
1613 | } | |
1614 | ||
1615 | /* | |
1616 | * 5. Transmit the RPC request, and wait for reply | |
1617 | */ | |
1618 | static void | |
1619 | call_transmit(struct rpc_task *task) | |
1620 | { | |
46121cf7 | 1621 | dprint_status(task); |
1da177e4 LT |
1622 | |
1623 | task->tk_action = call_status; | |
1624 | if (task->tk_status < 0) | |
1625 | return; | |
1626 | task->tk_status = xprt_prepare_transmit(task); | |
1627 | if (task->tk_status != 0) | |
1628 | return; | |
e0ab53de | 1629 | task->tk_action = call_transmit_status; |
1da177e4 | 1630 | /* Encode here so that rpcsec_gss can use correct sequence number. */ |
940e3318 | 1631 | if (rpc_task_need_encode(task)) { |
e0ab53de | 1632 | BUG_ON(task->tk_rqstp->rq_bytes_sent != 0); |
b0e1c57e | 1633 | rpc_xdr_encode(task); |
5e5ce5be | 1634 | /* Did the encode result in an error condition? */ |
8b39f2b4 TM |
1635 | if (task->tk_status != 0) { |
1636 | /* Was the error nonfatal? */ | |
1637 | if (task->tk_status == -EAGAIN) | |
1638 | rpc_delay(task, HZ >> 4); | |
1639 | else | |
1640 | rpc_exit(task, task->tk_status); | |
e0ab53de | 1641 | return; |
8b39f2b4 | 1642 | } |
5e5ce5be | 1643 | } |
1da177e4 LT |
1644 | xprt_transmit(task); |
1645 | if (task->tk_status < 0) | |
1646 | return; | |
e0ab53de TM |
1647 | /* |
1648 | * On success, ensure that we call xprt_end_transmit() before sleeping | |
1649 | * in order to allow access to the socket to other RPC requests. | |
1650 | */ | |
1651 | call_transmit_status(task); | |
55ae1aab | 1652 | if (rpc_reply_expected(task)) |
e0ab53de TM |
1653 | return; |
1654 | task->tk_action = rpc_exit_task; | |
fda13939 | 1655 | rpc_wake_up_queued_task(&task->tk_xprt->pending, task); |
e0ab53de TM |
1656 | } |
1657 | ||
1658 | /* | |
1659 | * 5a. Handle cleanup after a transmission | |
1660 | */ | |
1661 | static void | |
1662 | call_transmit_status(struct rpc_task *task) | |
1663 | { | |
1664 | task->tk_action = call_status; | |
206a134b CL |
1665 | |
1666 | /* | |
1667 | * Common case: success. Force the compiler to put this | |
1668 | * test first. | |
1669 | */ | |
1670 | if (task->tk_status == 0) { | |
1671 | xprt_end_transmit(task); | |
1672 | rpc_task_force_reencode(task); | |
1673 | return; | |
1674 | } | |
1675 | ||
15f081ca TM |
1676 | switch (task->tk_status) { |
1677 | case -EAGAIN: | |
1678 | break; | |
1679 | default: | |
206a134b | 1680 | dprint_status(task); |
15f081ca | 1681 | xprt_end_transmit(task); |
09a21c41 CL |
1682 | rpc_task_force_reencode(task); |
1683 | break; | |
15f081ca TM |
1684 | /* |
1685 | * Special cases: if we've been waiting on the | |
1686 | * socket's write_space() callback, or if the | |
1687 | * socket just returned a connection error, | |
1688 | * then hold onto the transport lock. | |
1689 | */ | |
1690 | case -ECONNREFUSED: | |
15f081ca TM |
1691 | case -EHOSTDOWN: |
1692 | case -EHOSTUNREACH: | |
1693 | case -ENETUNREACH: | |
09a21c41 CL |
1694 | if (RPC_IS_SOFTCONN(task)) { |
1695 | xprt_end_transmit(task); | |
1696 | rpc_exit(task, task->tk_status); | |
1697 | break; | |
1698 | } | |
1699 | case -ECONNRESET: | |
1700 | case -ENOTCONN: | |
c8485e4d | 1701 | case -EPIPE: |
15f081ca TM |
1702 | rpc_task_force_reencode(task); |
1703 | } | |
1da177e4 LT |
1704 | } |
1705 | ||
9e00abc3 | 1706 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
55ae1aab RL |
1707 | /* |
1708 | * 5b. Send the backchannel RPC reply. On error, drop the reply. In | |
1709 | * addition, disconnect on connectivity errors. | |
1710 | */ | |
1711 | static void | |
1712 | call_bc_transmit(struct rpc_task *task) | |
1713 | { | |
1714 | struct rpc_rqst *req = task->tk_rqstp; | |
1715 | ||
1716 | BUG_ON(task->tk_status != 0); | |
1717 | task->tk_status = xprt_prepare_transmit(task); | |
1718 | if (task->tk_status == -EAGAIN) { | |
1719 | /* | |
1720 | * Could not reserve the transport. Try again after the | |
1721 | * transport is released. | |
1722 | */ | |
1723 | task->tk_status = 0; | |
1724 | task->tk_action = call_bc_transmit; | |
1725 | return; | |
1726 | } | |
1727 | ||
1728 | task->tk_action = rpc_exit_task; | |
1729 | if (task->tk_status < 0) { | |
1730 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " | |
1731 | "error: %d\n", task->tk_status); | |
1732 | return; | |
1733 | } | |
1734 | ||
1735 | xprt_transmit(task); | |
1736 | xprt_end_transmit(task); | |
1737 | dprint_status(task); | |
1738 | switch (task->tk_status) { | |
1739 | case 0: | |
1740 | /* Success */ | |
1741 | break; | |
1742 | case -EHOSTDOWN: | |
1743 | case -EHOSTUNREACH: | |
1744 | case -ENETUNREACH: | |
1745 | case -ETIMEDOUT: | |
1746 | /* | |
1747 | * Problem reaching the server. Disconnect and let the | |
1748 | * forechannel reestablish the connection. The server will | |
1749 | * have to retransmit the backchannel request and we'll | |
1750 | * reprocess it. Since these ops are idempotent, there's no | |
1751 | * need to cache our reply at this time. | |
1752 | */ | |
1753 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " | |
1754 | "error: %d\n", task->tk_status); | |
1755 | xprt_conditional_disconnect(task->tk_xprt, | |
1756 | req->rq_connect_cookie); | |
1757 | break; | |
1758 | default: | |
1759 | /* | |
1760 | * We were unable to reply and will have to drop the | |
1761 | * request. The server should reconnect and retransmit. | |
1762 | */ | |
1763 | BUG_ON(task->tk_status == -EAGAIN); | |
1764 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " | |
1765 | "error: %d\n", task->tk_status); | |
1766 | break; | |
1767 | } | |
1768 | rpc_wake_up_queued_task(&req->rq_xprt->pending, task); | |
1769 | } | |
9e00abc3 | 1770 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
55ae1aab | 1771 | |
1da177e4 LT |
1772 | /* |
1773 | * 6. Sort out the RPC call status | |
1774 | */ | |
1775 | static void | |
1776 | call_status(struct rpc_task *task) | |
1777 | { | |
1778 | struct rpc_clnt *clnt = task->tk_client; | |
1779 | struct rpc_rqst *req = task->tk_rqstp; | |
1780 | int status; | |
1781 | ||
dd2b63d0 RL |
1782 | if (req->rq_reply_bytes_recvd > 0 && !req->rq_bytes_sent) |
1783 | task->tk_status = req->rq_reply_bytes_recvd; | |
1da177e4 | 1784 | |
46121cf7 | 1785 | dprint_status(task); |
1da177e4 LT |
1786 | |
1787 | status = task->tk_status; | |
1788 | if (status >= 0) { | |
1789 | task->tk_action = call_decode; | |
1790 | return; | |
1791 | } | |
1792 | ||
5753cba1 | 1793 | trace_rpc_call_status(task); |
1da177e4 LT |
1794 | task->tk_status = 0; |
1795 | switch(status) { | |
76303992 TM |
1796 | case -EHOSTDOWN: |
1797 | case -EHOSTUNREACH: | |
1798 | case -ENETUNREACH: | |
1799 | /* | |
1800 | * Delay any retries for 3 seconds, then handle as if it | |
1801 | * were a timeout. | |
1802 | */ | |
1803 | rpc_delay(task, 3*HZ); | |
1da177e4 LT |
1804 | case -ETIMEDOUT: |
1805 | task->tk_action = call_timeout; | |
241c39b9 | 1806 | if (task->tk_client->cl_discrtry) |
7c1d71cf TM |
1807 | xprt_conditional_disconnect(task->tk_xprt, |
1808 | req->rq_connect_cookie); | |
1da177e4 | 1809 | break; |
c8485e4d | 1810 | case -ECONNRESET: |
1da177e4 | 1811 | case -ECONNREFUSED: |
35f5a422 | 1812 | rpc_force_rebind(clnt); |
c8485e4d TM |
1813 | rpc_delay(task, 3*HZ); |
1814 | case -EPIPE: | |
1815 | case -ENOTCONN: | |
1da177e4 LT |
1816 | task->tk_action = call_bind; |
1817 | break; | |
1818 | case -EAGAIN: | |
1819 | task->tk_action = call_transmit; | |
1820 | break; | |
1821 | case -EIO: | |
1822 | /* shutdown or soft timeout */ | |
1823 | rpc_exit(task, status); | |
1824 | break; | |
1825 | default: | |
b6b6152c OK |
1826 | if (clnt->cl_chatty) |
1827 | printk("%s: RPC call returned error %d\n", | |
1da177e4 LT |
1828 | clnt->cl_protname, -status); |
1829 | rpc_exit(task, status); | |
1da177e4 LT |
1830 | } |
1831 | } | |
1832 | ||
1833 | /* | |
e0ab53de | 1834 | * 6a. Handle RPC timeout |
1da177e4 LT |
1835 | * We do not release the request slot, so we keep using the |
1836 | * same XID for all retransmits. | |
1837 | */ | |
1838 | static void | |
1839 | call_timeout(struct rpc_task *task) | |
1840 | { | |
1841 | struct rpc_clnt *clnt = task->tk_client; | |
1842 | ||
1843 | if (xprt_adjust_timeout(task->tk_rqstp) == 0) { | |
46121cf7 | 1844 | dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid); |
1da177e4 LT |
1845 | goto retry; |
1846 | } | |
1847 | ||
46121cf7 | 1848 | dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid); |
ef759a2e CL |
1849 | task->tk_timeouts++; |
1850 | ||
3a28becc CL |
1851 | if (RPC_IS_SOFTCONN(task)) { |
1852 | rpc_exit(task, -ETIMEDOUT); | |
1853 | return; | |
1854 | } | |
1da177e4 | 1855 | if (RPC_IS_SOFT(task)) { |
cac5d07e | 1856 | if (clnt->cl_chatty) { |
4e0038b6 | 1857 | rcu_read_lock(); |
b6b6152c | 1858 | printk(KERN_NOTICE "%s: server %s not responding, timed out\n", |
4e0038b6 TM |
1859 | clnt->cl_protname, |
1860 | rcu_dereference(clnt->cl_xprt)->servername); | |
1861 | rcu_read_unlock(); | |
cac5d07e | 1862 | } |
7494d00c TM |
1863 | if (task->tk_flags & RPC_TASK_TIMEOUT) |
1864 | rpc_exit(task, -ETIMEDOUT); | |
1865 | else | |
1866 | rpc_exit(task, -EIO); | |
1da177e4 LT |
1867 | return; |
1868 | } | |
1869 | ||
f518e35a | 1870 | if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) { |
1da177e4 | 1871 | task->tk_flags |= RPC_CALL_MAJORSEEN; |
4e0038b6 TM |
1872 | if (clnt->cl_chatty) { |
1873 | rcu_read_lock(); | |
b6b6152c | 1874 | printk(KERN_NOTICE "%s: server %s not responding, still trying\n", |
4e0038b6 TM |
1875 | clnt->cl_protname, |
1876 | rcu_dereference(clnt->cl_xprt)->servername); | |
1877 | rcu_read_unlock(); | |
1878 | } | |
1da177e4 | 1879 | } |
35f5a422 | 1880 | rpc_force_rebind(clnt); |
b48633bd TM |
1881 | /* |
1882 | * Did our request time out due to an RPCSEC_GSS out-of-sequence | |
1883 | * event? RFC2203 requires the server to drop all such requests. | |
1884 | */ | |
1885 | rpcauth_invalcred(task); | |
1da177e4 LT |
1886 | |
1887 | retry: | |
1888 | clnt->cl_stats->rpcretrans++; | |
1889 | task->tk_action = call_bind; | |
1890 | task->tk_status = 0; | |
1891 | } | |
1892 | ||
1893 | /* | |
1894 | * 7. Decode the RPC reply | |
1895 | */ | |
1896 | static void | |
1897 | call_decode(struct rpc_task *task) | |
1898 | { | |
1899 | struct rpc_clnt *clnt = task->tk_client; | |
1900 | struct rpc_rqst *req = task->tk_rqstp; | |
bf269551 | 1901 | kxdrdproc_t decode = task->tk_msg.rpc_proc->p_decode; |
d8ed029d | 1902 | __be32 *p; |
1da177e4 | 1903 | |
726fd6ad | 1904 | dprint_status(task); |
1da177e4 | 1905 | |
f518e35a | 1906 | if (task->tk_flags & RPC_CALL_MAJORSEEN) { |
4e0038b6 TM |
1907 | if (clnt->cl_chatty) { |
1908 | rcu_read_lock(); | |
b6b6152c | 1909 | printk(KERN_NOTICE "%s: server %s OK\n", |
4e0038b6 TM |
1910 | clnt->cl_protname, |
1911 | rcu_dereference(clnt->cl_xprt)->servername); | |
1912 | rcu_read_unlock(); | |
1913 | } | |
1da177e4 LT |
1914 | task->tk_flags &= ~RPC_CALL_MAJORSEEN; |
1915 | } | |
1916 | ||
43ac3f29 TM |
1917 | /* |
1918 | * Ensure that we see all writes made by xprt_complete_rqst() | |
dd2b63d0 | 1919 | * before it changed req->rq_reply_bytes_recvd. |
43ac3f29 TM |
1920 | */ |
1921 | smp_rmb(); | |
1da177e4 LT |
1922 | req->rq_rcv_buf.len = req->rq_private_buf.len; |
1923 | ||
1924 | /* Check that the softirq receive buffer is valid */ | |
1925 | WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf, | |
1926 | sizeof(req->rq_rcv_buf)) != 0); | |
1927 | ||
1e799b67 TM |
1928 | if (req->rq_rcv_buf.len < 12) { |
1929 | if (!RPC_IS_SOFT(task)) { | |
1930 | task->tk_action = call_bind; | |
1931 | clnt->cl_stats->rpcretrans++; | |
1932 | goto out_retry; | |
1933 | } | |
1934 | dprintk("RPC: %s: too small RPC reply size (%d bytes)\n", | |
1935 | clnt->cl_protname, task->tk_status); | |
1936 | task->tk_action = call_timeout; | |
1937 | goto out_retry; | |
1938 | } | |
1939 | ||
b0e1c57e | 1940 | p = rpc_verify_header(task); |
abbcf28f TM |
1941 | if (IS_ERR(p)) { |
1942 | if (p == ERR_PTR(-EAGAIN)) | |
1943 | goto out_retry; | |
1944 | return; | |
1da177e4 LT |
1945 | } |
1946 | ||
abbcf28f | 1947 | task->tk_action = rpc_exit_task; |
1da177e4 | 1948 | |
6d5fcb5a | 1949 | if (decode) { |
1da177e4 LT |
1950 | task->tk_status = rpcauth_unwrap_resp(task, decode, req, p, |
1951 | task->tk_msg.rpc_resp); | |
6d5fcb5a | 1952 | } |
46121cf7 CL |
1953 | dprintk("RPC: %5u call_decode result %d\n", task->tk_pid, |
1954 | task->tk_status); | |
1da177e4 LT |
1955 | return; |
1956 | out_retry: | |
1da177e4 | 1957 | task->tk_status = 0; |
b0e1c57e | 1958 | /* Note: rpc_verify_header() may have freed the RPC slot */ |
24b74bf0 | 1959 | if (task->tk_rqstp == req) { |
dd2b63d0 | 1960 | req->rq_reply_bytes_recvd = req->rq_rcv_buf.len = 0; |
24b74bf0 | 1961 | if (task->tk_client->cl_discrtry) |
7c1d71cf TM |
1962 | xprt_conditional_disconnect(task->tk_xprt, |
1963 | req->rq_connect_cookie); | |
24b74bf0 | 1964 | } |
1da177e4 LT |
1965 | } |
1966 | ||
d8ed029d | 1967 | static __be32 * |
b0e1c57e | 1968 | rpc_encode_header(struct rpc_task *task) |
1da177e4 LT |
1969 | { |
1970 | struct rpc_clnt *clnt = task->tk_client; | |
1da177e4 | 1971 | struct rpc_rqst *req = task->tk_rqstp; |
d8ed029d | 1972 | __be32 *p = req->rq_svec[0].iov_base; |
1da177e4 LT |
1973 | |
1974 | /* FIXME: check buffer size? */ | |
808012fb CL |
1975 | |
1976 | p = xprt_skip_transport_header(task->tk_xprt, p); | |
1da177e4 LT |
1977 | *p++ = req->rq_xid; /* XID */ |
1978 | *p++ = htonl(RPC_CALL); /* CALL */ | |
1979 | *p++ = htonl(RPC_VERSION); /* RPC version */ | |
1980 | *p++ = htonl(clnt->cl_prog); /* program number */ | |
1981 | *p++ = htonl(clnt->cl_vers); /* program version */ | |
1982 | *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */ | |
334ccfd5 TM |
1983 | p = rpcauth_marshcred(task, p); |
1984 | req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p); | |
1985 | return p; | |
1da177e4 LT |
1986 | } |
1987 | ||
d8ed029d | 1988 | static __be32 * |
b0e1c57e | 1989 | rpc_verify_header(struct rpc_task *task) |
1da177e4 | 1990 | { |
4e0038b6 | 1991 | struct rpc_clnt *clnt = task->tk_client; |
1da177e4 LT |
1992 | struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0]; |
1993 | int len = task->tk_rqstp->rq_rcv_buf.len >> 2; | |
d8ed029d AD |
1994 | __be32 *p = iov->iov_base; |
1995 | u32 n; | |
1da177e4 LT |
1996 | int error = -EACCES; |
1997 | ||
e8896495 DH |
1998 | if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) { |
1999 | /* RFC-1014 says that the representation of XDR data must be a | |
2000 | * multiple of four bytes | |
2001 | * - if it isn't pointer subtraction in the NFS client may give | |
2002 | * undefined results | |
2003 | */ | |
8a702bbb | 2004 | dprintk("RPC: %5u %s: XDR representation not a multiple of" |
0dc47877 | 2005 | " 4 bytes: 0x%x\n", task->tk_pid, __func__, |
8a702bbb | 2006 | task->tk_rqstp->rq_rcv_buf.len); |
e8896495 DH |
2007 | goto out_eio; |
2008 | } | |
1da177e4 LT |
2009 | if ((len -= 3) < 0) |
2010 | goto out_overflow; | |
1da177e4 | 2011 | |
f4a2e418 | 2012 | p += 1; /* skip XID */ |
1da177e4 | 2013 | if ((n = ntohl(*p++)) != RPC_REPLY) { |
8a702bbb | 2014 | dprintk("RPC: %5u %s: not an RPC reply: %x\n", |
f4a2e418 | 2015 | task->tk_pid, __func__, n); |
abbcf28f | 2016 | goto out_garbage; |
1da177e4 | 2017 | } |
f4a2e418 | 2018 | |
1da177e4 LT |
2019 | if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) { |
2020 | if (--len < 0) | |
2021 | goto out_overflow; | |
2022 | switch ((n = ntohl(*p++))) { | |
89f0e4fe JP |
2023 | case RPC_AUTH_ERROR: |
2024 | break; | |
2025 | case RPC_MISMATCH: | |
2026 | dprintk("RPC: %5u %s: RPC call version mismatch!\n", | |
2027 | task->tk_pid, __func__); | |
2028 | error = -EPROTONOSUPPORT; | |
2029 | goto out_err; | |
2030 | default: | |
2031 | dprintk("RPC: %5u %s: RPC call rejected, " | |
2032 | "unknown error: %x\n", | |
2033 | task->tk_pid, __func__, n); | |
2034 | goto out_eio; | |
1da177e4 LT |
2035 | } |
2036 | if (--len < 0) | |
2037 | goto out_overflow; | |
2038 | switch ((n = ntohl(*p++))) { | |
2039 | case RPC_AUTH_REJECTEDCRED: | |
2040 | case RPC_AUTH_REJECTEDVERF: | |
2041 | case RPCSEC_GSS_CREDPROBLEM: | |
2042 | case RPCSEC_GSS_CTXPROBLEM: | |
2043 | if (!task->tk_cred_retry) | |
2044 | break; | |
2045 | task->tk_cred_retry--; | |
46121cf7 | 2046 | dprintk("RPC: %5u %s: retry stale creds\n", |
0dc47877 | 2047 | task->tk_pid, __func__); |
1da177e4 | 2048 | rpcauth_invalcred(task); |
220bcc2a TM |
2049 | /* Ensure we obtain a new XID! */ |
2050 | xprt_release(task); | |
118df3d1 | 2051 | task->tk_action = call_reserve; |
abbcf28f | 2052 | goto out_retry; |
1da177e4 LT |
2053 | case RPC_AUTH_BADCRED: |
2054 | case RPC_AUTH_BADVERF: | |
2055 | /* possibly garbled cred/verf? */ | |
2056 | if (!task->tk_garb_retry) | |
2057 | break; | |
2058 | task->tk_garb_retry--; | |
46121cf7 | 2059 | dprintk("RPC: %5u %s: retry garbled creds\n", |
0dc47877 | 2060 | task->tk_pid, __func__); |
1da177e4 | 2061 | task->tk_action = call_bind; |
abbcf28f | 2062 | goto out_retry; |
1da177e4 | 2063 | case RPC_AUTH_TOOWEAK: |
4e0038b6 | 2064 | rcu_read_lock(); |
b0e1c57e | 2065 | printk(KERN_NOTICE "RPC: server %s requires stronger " |
4e0038b6 TM |
2066 | "authentication.\n", |
2067 | rcu_dereference(clnt->cl_xprt)->servername); | |
2068 | rcu_read_unlock(); | |
1da177e4 LT |
2069 | break; |
2070 | default: | |
8a702bbb | 2071 | dprintk("RPC: %5u %s: unknown auth error: %x\n", |
0dc47877 | 2072 | task->tk_pid, __func__, n); |
1da177e4 LT |
2073 | error = -EIO; |
2074 | } | |
46121cf7 | 2075 | dprintk("RPC: %5u %s: call rejected %d\n", |
0dc47877 | 2076 | task->tk_pid, __func__, n); |
1da177e4 LT |
2077 | goto out_err; |
2078 | } | |
2079 | if (!(p = rpcauth_checkverf(task, p))) { | |
8a702bbb | 2080 | dprintk("RPC: %5u %s: auth check failed\n", |
0dc47877 | 2081 | task->tk_pid, __func__); |
abbcf28f | 2082 | goto out_garbage; /* bad verifier, retry */ |
1da177e4 | 2083 | } |
d8ed029d | 2084 | len = p - (__be32 *)iov->iov_base - 1; |
1da177e4 LT |
2085 | if (len < 0) |
2086 | goto out_overflow; | |
2087 | switch ((n = ntohl(*p++))) { | |
2088 | case RPC_SUCCESS: | |
2089 | return p; | |
2090 | case RPC_PROG_UNAVAIL: | |
4e0038b6 TM |
2091 | dprintk_rcu("RPC: %5u %s: program %u is unsupported " |
2092 | "by server %s\n", task->tk_pid, __func__, | |
2093 | (unsigned int)clnt->cl_prog, | |
2094 | rcu_dereference(clnt->cl_xprt)->servername); | |
cdf47706 AG |
2095 | error = -EPFNOSUPPORT; |
2096 | goto out_err; | |
1da177e4 | 2097 | case RPC_PROG_MISMATCH: |
4e0038b6 TM |
2098 | dprintk_rcu("RPC: %5u %s: program %u, version %u unsupported " |
2099 | "by server %s\n", task->tk_pid, __func__, | |
2100 | (unsigned int)clnt->cl_prog, | |
2101 | (unsigned int)clnt->cl_vers, | |
2102 | rcu_dereference(clnt->cl_xprt)->servername); | |
cdf47706 AG |
2103 | error = -EPROTONOSUPPORT; |
2104 | goto out_err; | |
1da177e4 | 2105 | case RPC_PROC_UNAVAIL: |
4e0038b6 | 2106 | dprintk_rcu("RPC: %5u %s: proc %s unsupported by program %u, " |
46121cf7 | 2107 | "version %u on server %s\n", |
0dc47877 | 2108 | task->tk_pid, __func__, |
3748f1e4 | 2109 | rpc_proc_name(task), |
4e0038b6 TM |
2110 | clnt->cl_prog, clnt->cl_vers, |
2111 | rcu_dereference(clnt->cl_xprt)->servername); | |
cdf47706 AG |
2112 | error = -EOPNOTSUPP; |
2113 | goto out_err; | |
1da177e4 | 2114 | case RPC_GARBAGE_ARGS: |
46121cf7 | 2115 | dprintk("RPC: %5u %s: server saw garbage\n", |
0dc47877 | 2116 | task->tk_pid, __func__); |
1da177e4 LT |
2117 | break; /* retry */ |
2118 | default: | |
8a702bbb | 2119 | dprintk("RPC: %5u %s: server accept status: %x\n", |
0dc47877 | 2120 | task->tk_pid, __func__, n); |
1da177e4 LT |
2121 | /* Also retry */ |
2122 | } | |
2123 | ||
abbcf28f | 2124 | out_garbage: |
4e0038b6 | 2125 | clnt->cl_stats->rpcgarbage++; |
1da177e4 LT |
2126 | if (task->tk_garb_retry) { |
2127 | task->tk_garb_retry--; | |
46121cf7 | 2128 | dprintk("RPC: %5u %s: retrying\n", |
0dc47877 | 2129 | task->tk_pid, __func__); |
1da177e4 | 2130 | task->tk_action = call_bind; |
abbcf28f TM |
2131 | out_retry: |
2132 | return ERR_PTR(-EAGAIN); | |
1da177e4 | 2133 | } |
1da177e4 LT |
2134 | out_eio: |
2135 | error = -EIO; | |
2136 | out_err: | |
2137 | rpc_exit(task, error); | |
8a702bbb | 2138 | dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid, |
0dc47877 | 2139 | __func__, error); |
abbcf28f | 2140 | return ERR_PTR(error); |
1da177e4 | 2141 | out_overflow: |
8a702bbb | 2142 | dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid, |
0dc47877 | 2143 | __func__); |
abbcf28f | 2144 | goto out_garbage; |
1da177e4 | 2145 | } |
5ee0ed7d | 2146 | |
9f06c719 | 2147 | static void rpcproc_encode_null(void *rqstp, struct xdr_stream *xdr, void *obj) |
5ee0ed7d | 2148 | { |
5ee0ed7d TM |
2149 | } |
2150 | ||
bf269551 | 2151 | static int rpcproc_decode_null(void *rqstp, struct xdr_stream *xdr, void *obj) |
5ee0ed7d TM |
2152 | { |
2153 | return 0; | |
2154 | } | |
2155 | ||
2156 | static struct rpc_procinfo rpcproc_null = { | |
2157 | .p_encode = rpcproc_encode_null, | |
2158 | .p_decode = rpcproc_decode_null, | |
2159 | }; | |
2160 | ||
caabea8a | 2161 | static int rpc_ping(struct rpc_clnt *clnt) |
5ee0ed7d TM |
2162 | { |
2163 | struct rpc_message msg = { | |
2164 | .rpc_proc = &rpcproc_null, | |
2165 | }; | |
2166 | int err; | |
2167 | msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0); | |
caabea8a | 2168 | err = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN); |
5ee0ed7d TM |
2169 | put_rpccred(msg.rpc_cred); |
2170 | return err; | |
2171 | } | |
188fef11 | 2172 | |
5e1550d6 TM |
2173 | struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags) |
2174 | { | |
2175 | struct rpc_message msg = { | |
2176 | .rpc_proc = &rpcproc_null, | |
2177 | .rpc_cred = cred, | |
2178 | }; | |
84115e1c TM |
2179 | struct rpc_task_setup task_setup_data = { |
2180 | .rpc_client = clnt, | |
2181 | .rpc_message = &msg, | |
2182 | .callback_ops = &rpc_default_ops, | |
2183 | .flags = flags, | |
2184 | }; | |
c970aa85 | 2185 | return rpc_run_task(&task_setup_data); |
5e1550d6 | 2186 | } |
e8914c65 | 2187 | EXPORT_SYMBOL_GPL(rpc_call_null); |
5e1550d6 | 2188 | |
188fef11 | 2189 | #ifdef RPC_DEBUG |
68a23ee9 CL |
2190 | static void rpc_show_header(void) |
2191 | { | |
cb3997b5 CL |
2192 | printk(KERN_INFO "-pid- flgs status -client- --rqstp- " |
2193 | "-timeout ---ops--\n"); | |
68a23ee9 CL |
2194 | } |
2195 | ||
38e886e0 CL |
2196 | static void rpc_show_task(const struct rpc_clnt *clnt, |
2197 | const struct rpc_task *task) | |
2198 | { | |
2199 | const char *rpc_waitq = "none"; | |
38e886e0 CL |
2200 | |
2201 | if (RPC_IS_QUEUED(task)) | |
2202 | rpc_waitq = rpc_qname(task->tk_waitqueue); | |
2203 | ||
b3bcedad | 2204 | printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%ps q:%s\n", |
cb3997b5 CL |
2205 | task->tk_pid, task->tk_flags, task->tk_status, |
2206 | clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops, | |
2207 | clnt->cl_protname, clnt->cl_vers, rpc_proc_name(task), | |
b3bcedad | 2208 | task->tk_action, rpc_waitq); |
38e886e0 CL |
2209 | } |
2210 | ||
70abc49b | 2211 | void rpc_show_tasks(struct net *net) |
188fef11 TM |
2212 | { |
2213 | struct rpc_clnt *clnt; | |
38e886e0 | 2214 | struct rpc_task *task; |
68a23ee9 | 2215 | int header = 0; |
70abc49b | 2216 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
188fef11 | 2217 | |
70abc49b SK |
2218 | spin_lock(&sn->rpc_client_lock); |
2219 | list_for_each_entry(clnt, &sn->all_clients, cl_clients) { | |
188fef11 | 2220 | spin_lock(&clnt->cl_lock); |
38e886e0 | 2221 | list_for_each_entry(task, &clnt->cl_tasks, tk_task) { |
68a23ee9 CL |
2222 | if (!header) { |
2223 | rpc_show_header(); | |
2224 | header++; | |
2225 | } | |
38e886e0 | 2226 | rpc_show_task(clnt, task); |
188fef11 TM |
2227 | } |
2228 | spin_unlock(&clnt->cl_lock); | |
2229 | } | |
70abc49b | 2230 | spin_unlock(&sn->rpc_client_lock); |
188fef11 TM |
2231 | } |
2232 | #endif |