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 | { | |
30507f58 | 105 | if (clnt->cl_dentry) { |
80df9d20 SK |
106 | if (clnt->cl_auth && clnt->cl_auth->au_ops->pipes_destroy) |
107 | clnt->cl_auth->au_ops->pipes_destroy(clnt->cl_auth); | |
30507f58 | 108 | rpc_remove_client_dir(clnt->cl_dentry); |
80df9d20 | 109 | } |
30507f58 | 110 | clnt->cl_dentry = NULL; |
0157d021 SK |
111 | } |
112 | ||
113 | static void rpc_clnt_remove_pipedir(struct rpc_clnt *clnt) | |
114 | { | |
2446ab60 | 115 | struct net *net = rpc_net_ns(clnt); |
0157d021 | 116 | struct super_block *pipefs_sb; |
0157d021 | 117 | |
2446ab60 | 118 | pipefs_sb = rpc_get_sb_net(net); |
0157d021 | 119 | if (pipefs_sb) { |
0157d021 | 120 | __rpc_clnt_remove_pipedir(clnt); |
2446ab60 | 121 | rpc_put_sb_net(net); |
0157d021 | 122 | } |
0157d021 SK |
123 | } |
124 | ||
125 | static struct dentry *rpc_setup_pipedir_sb(struct super_block *sb, | |
080b794c TM |
126 | struct rpc_clnt *clnt, |
127 | const char *dir_name) | |
1da177e4 | 128 | { |
f134585a | 129 | static uint32_t clntid; |
23ac6581 | 130 | char name[15]; |
26fe5750 | 131 | struct qstr q = { .name = name }; |
0157d021 | 132 | struct dentry *dir, *dentry; |
1da177e4 LT |
133 | int error; |
134 | ||
0157d021 | 135 | dir = rpc_d_lookup_sb(sb, dir_name); |
922eeac3 WAA |
136 | if (dir == NULL) { |
137 | pr_info("RPC: pipefs directory doesn't exist: %s\n", dir_name); | |
0157d021 | 138 | return dir; |
922eeac3 | 139 | } |
f134585a | 140 | for (;;) { |
23ac6581 TM |
141 | q.len = snprintf(name, sizeof(name), "clnt%x", (unsigned int)clntid++); |
142 | name[sizeof(name) - 1] = '\0'; | |
143 | q.hash = full_name_hash(q.name, q.len); | |
0157d021 SK |
144 | dentry = rpc_create_client_dir(dir, &q, clnt); |
145 | if (!IS_ERR(dentry)) | |
23ac6581 | 146 | break; |
0157d021 | 147 | error = PTR_ERR(dentry); |
f134585a | 148 | if (error != -EEXIST) { |
23ac6581 TM |
149 | printk(KERN_INFO "RPC: Couldn't create pipefs entry" |
150 | " %s/%s, error %d\n", | |
151 | dir_name, name, error); | |
0157d021 | 152 | break; |
f134585a | 153 | } |
1da177e4 | 154 | } |
0157d021 SK |
155 | dput(dir); |
156 | return dentry; | |
157 | } | |
158 | ||
159 | static int | |
080b794c | 160 | rpc_setup_pipedir(struct rpc_clnt *clnt, const char *dir_name) |
0157d021 | 161 | { |
2446ab60 | 162 | struct net *net = rpc_net_ns(clnt); |
0157d021 | 163 | struct super_block *pipefs_sb; |
30507f58 | 164 | struct dentry *dentry; |
0157d021 | 165 | |
30507f58 | 166 | clnt->cl_dentry = NULL; |
0157d021 SK |
167 | if (dir_name == NULL) |
168 | return 0; | |
2446ab60 | 169 | pipefs_sb = rpc_get_sb_net(net); |
70fe25b6 SK |
170 | if (!pipefs_sb) |
171 | return 0; | |
30507f58 | 172 | dentry = rpc_setup_pipedir_sb(pipefs_sb, clnt, dir_name); |
2446ab60 | 173 | rpc_put_sb_net(net); |
30507f58 SK |
174 | if (IS_ERR(dentry)) |
175 | return PTR_ERR(dentry); | |
176 | clnt->cl_dentry = dentry; | |
23ac6581 | 177 | return 0; |
1da177e4 LT |
178 | } |
179 | ||
ea8cfa06 SK |
180 | static inline int rpc_clnt_skip_event(struct rpc_clnt *clnt, unsigned long event) |
181 | { | |
182 | if (((event == RPC_PIPEFS_MOUNT) && clnt->cl_dentry) || | |
183 | ((event == RPC_PIPEFS_UMOUNT) && !clnt->cl_dentry)) | |
184 | return 1; | |
185 | return 0; | |
186 | } | |
187 | ||
188 | static int __rpc_clnt_handle_event(struct rpc_clnt *clnt, unsigned long event, | |
189 | struct super_block *sb) | |
80df9d20 SK |
190 | { |
191 | struct dentry *dentry; | |
192 | int err = 0; | |
193 | ||
194 | switch (event) { | |
195 | case RPC_PIPEFS_MOUNT: | |
80df9d20 SK |
196 | dentry = rpc_setup_pipedir_sb(sb, clnt, |
197 | clnt->cl_program->pipe_dir_name); | |
922eeac3 WAA |
198 | if (!dentry) |
199 | return -ENOENT; | |
80df9d20 SK |
200 | if (IS_ERR(dentry)) |
201 | return PTR_ERR(dentry); | |
30507f58 | 202 | clnt->cl_dentry = dentry; |
80df9d20 SK |
203 | if (clnt->cl_auth->au_ops->pipes_create) { |
204 | err = clnt->cl_auth->au_ops->pipes_create(clnt->cl_auth); | |
205 | if (err) | |
206 | __rpc_clnt_remove_pipedir(clnt); | |
207 | } | |
208 | break; | |
209 | case RPC_PIPEFS_UMOUNT: | |
210 | __rpc_clnt_remove_pipedir(clnt); | |
211 | break; | |
212 | default: | |
213 | printk(KERN_ERR "%s: unknown event: %ld\n", __func__, event); | |
214 | return -ENOTSUPP; | |
215 | } | |
216 | return err; | |
217 | } | |
218 | ||
ea8cfa06 SK |
219 | static int __rpc_pipefs_event(struct rpc_clnt *clnt, unsigned long event, |
220 | struct super_block *sb) | |
221 | { | |
222 | int error = 0; | |
223 | ||
224 | for (;; clnt = clnt->cl_parent) { | |
225 | if (!rpc_clnt_skip_event(clnt, event)) | |
226 | error = __rpc_clnt_handle_event(clnt, event, sb); | |
227 | if (error || clnt == clnt->cl_parent) | |
228 | break; | |
229 | } | |
230 | return error; | |
231 | } | |
232 | ||
da3b4622 SK |
233 | static struct rpc_clnt *rpc_get_client_for_event(struct net *net, int event) |
234 | { | |
235 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
236 | struct rpc_clnt *clnt; | |
237 | ||
238 | spin_lock(&sn->rpc_client_lock); | |
239 | list_for_each_entry(clnt, &sn->all_clients, cl_clients) { | |
7aab449e | 240 | if (clnt->cl_program->pipe_dir_name == NULL) |
cd6c5968 | 241 | continue; |
ea8cfa06 | 242 | if (rpc_clnt_skip_event(clnt, event)) |
da3b4622 | 243 | continue; |
a4dff1bc SK |
244 | if (atomic_inc_not_zero(&clnt->cl_count) == 0) |
245 | continue; | |
da3b4622 SK |
246 | spin_unlock(&sn->rpc_client_lock); |
247 | return clnt; | |
248 | } | |
249 | spin_unlock(&sn->rpc_client_lock); | |
250 | return NULL; | |
251 | } | |
252 | ||
80df9d20 SK |
253 | static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event, |
254 | void *ptr) | |
255 | { | |
256 | struct super_block *sb = ptr; | |
257 | struct rpc_clnt *clnt; | |
258 | int error = 0; | |
80df9d20 | 259 | |
da3b4622 | 260 | while ((clnt = rpc_get_client_for_event(sb->s_fs_info, event))) { |
80df9d20 | 261 | error = __rpc_pipefs_event(clnt, event, sb); |
da3b4622 | 262 | rpc_release_client(clnt); |
80df9d20 SK |
263 | if (error) |
264 | break; | |
265 | } | |
80df9d20 SK |
266 | return error; |
267 | } | |
268 | ||
269 | static struct notifier_block rpc_clients_block = { | |
270 | .notifier_call = rpc_pipefs_event, | |
eee17325 | 271 | .priority = SUNRPC_PIPEFS_RPC_PRIO, |
80df9d20 SK |
272 | }; |
273 | ||
274 | int rpc_clients_notifier_register(void) | |
275 | { | |
276 | return rpc_pipefs_notifier_register(&rpc_clients_block); | |
277 | } | |
278 | ||
279 | void rpc_clients_notifier_unregister(void) | |
280 | { | |
281 | return rpc_pipefs_notifier_unregister(&rpc_clients_block); | |
282 | } | |
283 | ||
cbbb3449 TM |
284 | static void rpc_clnt_set_nodename(struct rpc_clnt *clnt, const char *nodename) |
285 | { | |
286 | clnt->cl_nodelen = strlen(nodename); | |
287 | if (clnt->cl_nodelen > UNX_MAXNODENAME) | |
288 | clnt->cl_nodelen = UNX_MAXNODENAME; | |
289 | memcpy(clnt->cl_nodename, nodename, clnt->cl_nodelen); | |
290 | } | |
291 | ||
698b6d08 | 292 | static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, struct rpc_xprt *xprt) |
1da177e4 | 293 | { |
a613fa16 TM |
294 | const struct rpc_program *program = args->program; |
295 | const struct rpc_version *version; | |
1da177e4 | 296 | struct rpc_clnt *clnt = NULL; |
6a19275a | 297 | struct rpc_auth *auth; |
1da177e4 | 298 | int err; |
06b8d255 CL |
299 | |
300 | /* sanity check the name before trying to print it */ | |
46121cf7 | 301 | dprintk("RPC: creating %s client for %s (xprt %p)\n", |
698b6d08 | 302 | program->name, args->servername, xprt); |
1da177e4 | 303 | |
4ada539e TM |
304 | err = rpciod_up(); |
305 | if (err) | |
306 | goto out_no_rpciod; | |
1da177e4 LT |
307 | err = -EINVAL; |
308 | if (!xprt) | |
712917d1 | 309 | goto out_no_xprt; |
698b6d08 TM |
310 | |
311 | if (args->version >= program->nrvers) | |
312 | goto out_err; | |
313 | version = program->version[args->version]; | |
314 | if (version == NULL) | |
1da177e4 LT |
315 | goto out_err; |
316 | ||
317 | err = -ENOMEM; | |
0da974f4 | 318 | clnt = kzalloc(sizeof(*clnt), GFP_KERNEL); |
1da177e4 LT |
319 | if (!clnt) |
320 | goto out_err; | |
1da177e4 LT |
321 | clnt->cl_parent = clnt; |
322 | ||
2446ab60 | 323 | rcu_assign_pointer(clnt->cl_xprt, xprt); |
1da177e4 LT |
324 | clnt->cl_procinfo = version->procs; |
325 | clnt->cl_maxproc = version->nrprocs; | |
326 | clnt->cl_protname = program->name; | |
d5b337b4 | 327 | clnt->cl_prog = args->prognumber ? : program->number; |
1da177e4 | 328 | clnt->cl_vers = version->number; |
1da177e4 | 329 | clnt->cl_stats = program->stats; |
11c556b3 | 330 | clnt->cl_metrics = rpc_alloc_iostats(clnt); |
23bf85ba TM |
331 | err = -ENOMEM; |
332 | if (clnt->cl_metrics == NULL) | |
333 | goto out_no_stats; | |
3e32a5d9 | 334 | clnt->cl_program = program; |
6529eba0 | 335 | INIT_LIST_HEAD(&clnt->cl_tasks); |
4bef61ff | 336 | spin_lock_init(&clnt->cl_lock); |
1da177e4 | 337 | |
2446ab60 | 338 | if (!xprt_bound(xprt)) |
1da177e4 LT |
339 | clnt->cl_autobind = 1; |
340 | ||
ba7392bb TM |
341 | clnt->cl_timeout = xprt->timeout; |
342 | if (args->timeout != NULL) { | |
343 | memcpy(&clnt->cl_timeout_default, args->timeout, | |
344 | sizeof(clnt->cl_timeout_default)); | |
345 | clnt->cl_timeout = &clnt->cl_timeout_default; | |
346 | } | |
347 | ||
1da177e4 | 348 | clnt->cl_rtt = &clnt->cl_rtt_default; |
ba7392bb | 349 | rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval); |
608207e8 OK |
350 | clnt->cl_principal = NULL; |
351 | if (args->client_name) { | |
352 | clnt->cl_principal = kstrdup(args->client_name, GFP_KERNEL); | |
353 | if (!clnt->cl_principal) | |
354 | goto out_no_principal; | |
355 | } | |
1da177e4 | 356 | |
006abe88 | 357 | atomic_set(&clnt->cl_count, 1); |
34f52e35 | 358 | |
1da177e4 LT |
359 | err = rpc_setup_pipedir(clnt, program->pipe_dir_name); |
360 | if (err < 0) | |
361 | goto out_no_path; | |
362 | ||
698b6d08 | 363 | auth = rpcauth_create(args->authflavor, clnt); |
6a19275a | 364 | if (IS_ERR(auth)) { |
1da177e4 | 365 | printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n", |
698b6d08 | 366 | args->authflavor); |
6a19275a | 367 | err = PTR_ERR(auth); |
1da177e4 LT |
368 | goto out_no_auth; |
369 | } | |
370 | ||
371 | /* save the nodename */ | |
cbbb3449 | 372 | rpc_clnt_set_nodename(clnt, utsname()->nodename); |
6529eba0 | 373 | rpc_register_client(clnt); |
1da177e4 LT |
374 | return clnt; |
375 | ||
376 | out_no_auth: | |
0157d021 | 377 | rpc_clnt_remove_pipedir(clnt); |
1da177e4 | 378 | out_no_path: |
608207e8 OK |
379 | kfree(clnt->cl_principal); |
380 | out_no_principal: | |
23bf85ba TM |
381 | rpc_free_iostats(clnt->cl_metrics); |
382 | out_no_stats: | |
1da177e4 LT |
383 | kfree(clnt); |
384 | out_err: | |
6b6ca86b | 385 | xprt_put(xprt); |
712917d1 | 386 | out_no_xprt: |
4ada539e TM |
387 | rpciod_down(); |
388 | out_no_rpciod: | |
1da177e4 LT |
389 | return ERR_PTR(err); |
390 | } | |
391 | ||
2c53040f | 392 | /** |
c2866763 CL |
393 | * rpc_create - create an RPC client and transport with one call |
394 | * @args: rpc_clnt create argument structure | |
395 | * | |
396 | * Creates and initializes an RPC transport and an RPC client. | |
397 | * | |
398 | * It can ping the server in order to determine if it is up, and to see if | |
399 | * it supports this program and version. RPC_CLNT_CREATE_NOPING disables | |
400 | * this behavior so asynchronous tasks can also use rpc_create. | |
401 | */ | |
402 | struct rpc_clnt *rpc_create(struct rpc_create_args *args) | |
403 | { | |
404 | struct rpc_xprt *xprt; | |
405 | struct rpc_clnt *clnt; | |
3c341b0b | 406 | struct xprt_create xprtargs = { |
9a23e332 | 407 | .net = args->net, |
4fa016eb | 408 | .ident = args->protocol, |
d3bc9a1d | 409 | .srcaddr = args->saddress, |
96802a09 FM |
410 | .dstaddr = args->address, |
411 | .addrlen = args->addrsize, | |
4e0038b6 | 412 | .servername = args->servername, |
f300baba | 413 | .bc_xprt = args->bc_xprt, |
96802a09 | 414 | }; |
510deb0d | 415 | char servername[48]; |
c2866763 | 416 | |
43780b87 CL |
417 | /* |
418 | * If the caller chooses not to specify a hostname, whip | |
419 | * up a string representation of the passed-in address. | |
420 | */ | |
4e0038b6 | 421 | if (xprtargs.servername == NULL) { |
176e21ee CL |
422 | struct sockaddr_un *sun = |
423 | (struct sockaddr_un *)args->address; | |
da09eb93 CL |
424 | struct sockaddr_in *sin = |
425 | (struct sockaddr_in *)args->address; | |
426 | struct sockaddr_in6 *sin6 = | |
427 | (struct sockaddr_in6 *)args->address; | |
428 | ||
510deb0d CL |
429 | servername[0] = '\0'; |
430 | switch (args->address->sa_family) { | |
176e21ee CL |
431 | case AF_LOCAL: |
432 | snprintf(servername, sizeof(servername), "%s", | |
433 | sun->sun_path); | |
434 | break; | |
da09eb93 | 435 | case AF_INET: |
21454aaa HH |
436 | snprintf(servername, sizeof(servername), "%pI4", |
437 | &sin->sin_addr.s_addr); | |
510deb0d | 438 | break; |
da09eb93 | 439 | case AF_INET6: |
5b095d98 | 440 | snprintf(servername, sizeof(servername), "%pI6", |
da09eb93 | 441 | &sin6->sin6_addr); |
510deb0d | 442 | break; |
510deb0d CL |
443 | default: |
444 | /* caller wants default server name, but | |
445 | * address family isn't recognized. */ | |
446 | return ERR_PTR(-EINVAL); | |
447 | } | |
4e0038b6 | 448 | xprtargs.servername = servername; |
43780b87 CL |
449 | } |
450 | ||
510deb0d CL |
451 | xprt = xprt_create_transport(&xprtargs); |
452 | if (IS_ERR(xprt)) | |
453 | return (struct rpc_clnt *)xprt; | |
454 | ||
c2866763 CL |
455 | /* |
456 | * By default, kernel RPC client connects from a reserved port. | |
457 | * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters, | |
458 | * but it is always enabled for rpciod, which handles the connect | |
459 | * operation. | |
460 | */ | |
461 | xprt->resvport = 1; | |
462 | if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT) | |
463 | xprt->resvport = 0; | |
464 | ||
698b6d08 | 465 | clnt = rpc_new_client(args, xprt); |
c2866763 CL |
466 | if (IS_ERR(clnt)) |
467 | return clnt; | |
468 | ||
469 | if (!(args->flags & RPC_CLNT_CREATE_NOPING)) { | |
caabea8a | 470 | int err = rpc_ping(clnt); |
c2866763 CL |
471 | if (err != 0) { |
472 | rpc_shutdown_client(clnt); | |
473 | return ERR_PTR(err); | |
474 | } | |
475 | } | |
476 | ||
477 | clnt->cl_softrtry = 1; | |
478 | if (args->flags & RPC_CLNT_CREATE_HARDRTRY) | |
479 | clnt->cl_softrtry = 0; | |
480 | ||
c2866763 CL |
481 | if (args->flags & RPC_CLNT_CREATE_AUTOBIND) |
482 | clnt->cl_autobind = 1; | |
43d78ef2 CL |
483 | if (args->flags & RPC_CLNT_CREATE_DISCRTRY) |
484 | clnt->cl_discrtry = 1; | |
b6b6152c OK |
485 | if (!(args->flags & RPC_CLNT_CREATE_QUIET)) |
486 | clnt->cl_chatty = 1; | |
c2866763 CL |
487 | |
488 | return clnt; | |
489 | } | |
b86acd50 | 490 | EXPORT_SYMBOL_GPL(rpc_create); |
c2866763 | 491 | |
1da177e4 LT |
492 | /* |
493 | * This function clones the RPC client structure. It allows us to share the | |
494 | * same transport while varying parameters such as the authentication | |
495 | * flavour. | |
496 | */ | |
1b63a751 CL |
497 | static struct rpc_clnt *__rpc_clone_client(struct rpc_create_args *args, |
498 | struct rpc_clnt *clnt) | |
1da177e4 | 499 | { |
2446ab60 | 500 | struct rpc_xprt *xprt; |
1b63a751 CL |
501 | struct rpc_clnt *new; |
502 | int err; | |
1da177e4 | 503 | |
1b63a751 | 504 | err = -ENOMEM; |
2446ab60 TM |
505 | rcu_read_lock(); |
506 | xprt = xprt_get(rcu_dereference(clnt->cl_xprt)); | |
507 | rcu_read_unlock(); | |
508 | if (xprt == NULL) | |
1b63a751 CL |
509 | goto out_err; |
510 | args->servername = xprt->servername; | |
511 | ||
512 | new = rpc_new_client(args, xprt); | |
513 | if (IS_ERR(new)) { | |
514 | err = PTR_ERR(new); | |
515 | goto out_put; | |
516 | } | |
517 | ||
006abe88 | 518 | atomic_inc(&clnt->cl_count); |
1b63a751 CL |
519 | new->cl_parent = clnt; |
520 | ||
521 | /* Turn off autobind on clones */ | |
522 | new->cl_autobind = 0; | |
523 | new->cl_softrtry = clnt->cl_softrtry; | |
524 | new->cl_discrtry = clnt->cl_discrtry; | |
525 | new->cl_chatty = clnt->cl_chatty; | |
1da177e4 | 526 | return new; |
1b63a751 CL |
527 | |
528 | out_put: | |
2446ab60 | 529 | xprt_put(xprt); |
1b63a751 | 530 | out_err: |
0dc47877 | 531 | dprintk("RPC: %s: returned error %d\n", __func__, err); |
3e32a5d9 | 532 | return ERR_PTR(err); |
1da177e4 | 533 | } |
1b63a751 CL |
534 | |
535 | /** | |
536 | * rpc_clone_client - Clone an RPC client structure | |
537 | * | |
538 | * @clnt: RPC client whose parameters are copied | |
539 | * | |
540 | * Returns a fresh RPC client or an ERR_PTR. | |
541 | */ | |
542 | struct rpc_clnt *rpc_clone_client(struct rpc_clnt *clnt) | |
543 | { | |
544 | struct rpc_create_args args = { | |
545 | .program = clnt->cl_program, | |
546 | .prognumber = clnt->cl_prog, | |
547 | .version = clnt->cl_vers, | |
548 | .authflavor = clnt->cl_auth->au_flavor, | |
549 | .client_name = clnt->cl_principal, | |
550 | }; | |
551 | return __rpc_clone_client(&args, clnt); | |
552 | } | |
e8914c65 | 553 | EXPORT_SYMBOL_GPL(rpc_clone_client); |
1da177e4 | 554 | |
ba9b584c CL |
555 | /** |
556 | * rpc_clone_client_set_auth - Clone an RPC client structure and set its auth | |
557 | * | |
558 | * @clnt: RPC client whose parameters are copied | |
559 | * @auth: security flavor for new client | |
560 | * | |
561 | * Returns a fresh RPC client or an ERR_PTR. | |
562 | */ | |
563 | struct rpc_clnt * | |
564 | rpc_clone_client_set_auth(struct rpc_clnt *clnt, rpc_authflavor_t flavor) | |
565 | { | |
566 | struct rpc_create_args args = { | |
567 | .program = clnt->cl_program, | |
568 | .prognumber = clnt->cl_prog, | |
569 | .version = clnt->cl_vers, | |
570 | .authflavor = flavor, | |
571 | .client_name = clnt->cl_principal, | |
572 | }; | |
573 | return __rpc_clone_client(&args, clnt); | |
574 | } | |
575 | EXPORT_SYMBOL_GPL(rpc_clone_client_set_auth); | |
576 | ||
58f9612c TM |
577 | /* |
578 | * Kill all tasks for the given client. | |
579 | * XXX: kill their descendants as well? | |
580 | */ | |
581 | void rpc_killall_tasks(struct rpc_clnt *clnt) | |
582 | { | |
583 | struct rpc_task *rovr; | |
584 | ||
585 | ||
586 | if (list_empty(&clnt->cl_tasks)) | |
587 | return; | |
588 | dprintk("RPC: killing all tasks for client %p\n", clnt); | |
589 | /* | |
590 | * Spin lock all_tasks to prevent changes... | |
591 | */ | |
592 | spin_lock(&clnt->cl_lock); | |
593 | list_for_each_entry(rovr, &clnt->cl_tasks, tk_task) { | |
594 | if (!RPC_IS_ACTIVATED(rovr)) | |
595 | continue; | |
596 | if (!(rovr->tk_flags & RPC_TASK_KILLED)) { | |
597 | rovr->tk_flags |= RPC_TASK_KILLED; | |
598 | rpc_exit(rovr, -EIO); | |
8e26de23 SK |
599 | if (RPC_IS_QUEUED(rovr)) |
600 | rpc_wake_up_queued_task(rovr->tk_waitqueue, | |
601 | rovr); | |
58f9612c TM |
602 | } |
603 | } | |
604 | spin_unlock(&clnt->cl_lock); | |
605 | } | |
606 | EXPORT_SYMBOL_GPL(rpc_killall_tasks); | |
607 | ||
1da177e4 LT |
608 | /* |
609 | * Properly shut down an RPC client, terminating all outstanding | |
90c5755f | 610 | * requests. |
1da177e4 | 611 | */ |
4c402b40 | 612 | void rpc_shutdown_client(struct rpc_clnt *clnt) |
1da177e4 | 613 | { |
168e4b39 WAA |
614 | /* |
615 | * To avoid deadlock, never call rpc_shutdown_client from a | |
616 | * workqueue context! | |
617 | */ | |
618 | WARN_ON_ONCE(current->flags & PF_WQ_WORKER); | |
619 | might_sleep(); | |
620 | ||
4e0038b6 TM |
621 | dprintk_rcu("RPC: shutting down %s client for %s\n", |
622 | clnt->cl_protname, | |
623 | rcu_dereference(clnt->cl_xprt)->servername); | |
1da177e4 | 624 | |
34f52e35 | 625 | while (!list_empty(&clnt->cl_tasks)) { |
1da177e4 | 626 | rpc_killall_tasks(clnt); |
532347e2 | 627 | wait_event_timeout(destroy_wait, |
34f52e35 | 628 | list_empty(&clnt->cl_tasks), 1*HZ); |
1da177e4 LT |
629 | } |
630 | ||
4c402b40 | 631 | rpc_release_client(clnt); |
1da177e4 | 632 | } |
e8914c65 | 633 | EXPORT_SYMBOL_GPL(rpc_shutdown_client); |
1da177e4 LT |
634 | |
635 | /* | |
34f52e35 | 636 | * Free an RPC client |
1da177e4 | 637 | */ |
34f52e35 | 638 | static void |
006abe88 | 639 | rpc_free_client(struct rpc_clnt *clnt) |
1da177e4 | 640 | { |
4e0038b6 TM |
641 | dprintk_rcu("RPC: destroying %s client for %s\n", |
642 | clnt->cl_protname, | |
643 | rcu_dereference(clnt->cl_xprt)->servername); | |
6eac7d3f | 644 | if (clnt->cl_parent != clnt) |
8ad7c892 | 645 | rpc_release_client(clnt->cl_parent); |
6529eba0 | 646 | rpc_unregister_client(clnt); |
f5131257 | 647 | rpc_clnt_remove_pipedir(clnt); |
11c556b3 | 648 | rpc_free_iostats(clnt->cl_metrics); |
608207e8 | 649 | kfree(clnt->cl_principal); |
11c556b3 | 650 | clnt->cl_metrics = NULL; |
2446ab60 | 651 | xprt_put(rcu_dereference_raw(clnt->cl_xprt)); |
4ada539e | 652 | rpciod_down(); |
1da177e4 | 653 | kfree(clnt); |
1da177e4 LT |
654 | } |
655 | ||
1dd17ec6 TM |
656 | /* |
657 | * Free an RPC client | |
658 | */ | |
659 | static void | |
006abe88 | 660 | rpc_free_auth(struct rpc_clnt *clnt) |
1dd17ec6 | 661 | { |
1dd17ec6 | 662 | if (clnt->cl_auth == NULL) { |
006abe88 | 663 | rpc_free_client(clnt); |
1dd17ec6 TM |
664 | return; |
665 | } | |
666 | ||
667 | /* | |
668 | * Note: RPCSEC_GSS may need to send NULL RPC calls in order to | |
669 | * release remaining GSS contexts. This mechanism ensures | |
670 | * that it can do so safely. | |
671 | */ | |
006abe88 | 672 | atomic_inc(&clnt->cl_count); |
1dd17ec6 TM |
673 | rpcauth_release(clnt->cl_auth); |
674 | clnt->cl_auth = NULL; | |
006abe88 TM |
675 | if (atomic_dec_and_test(&clnt->cl_count)) |
676 | rpc_free_client(clnt); | |
1dd17ec6 TM |
677 | } |
678 | ||
1da177e4 | 679 | /* |
34f52e35 | 680 | * Release reference to the RPC client |
1da177e4 LT |
681 | */ |
682 | void | |
683 | rpc_release_client(struct rpc_clnt *clnt) | |
684 | { | |
34f52e35 | 685 | dprintk("RPC: rpc_release_client(%p)\n", clnt); |
1da177e4 | 686 | |
34f52e35 TM |
687 | if (list_empty(&clnt->cl_tasks)) |
688 | wake_up(&destroy_wait); | |
006abe88 TM |
689 | if (atomic_dec_and_test(&clnt->cl_count)) |
690 | rpc_free_auth(clnt); | |
34f52e35 TM |
691 | } |
692 | ||
007e251f AG |
693 | /** |
694 | * rpc_bind_new_program - bind a new RPC program to an existing client | |
65b6e42c RD |
695 | * @old: old rpc_client |
696 | * @program: rpc program to set | |
697 | * @vers: rpc program version | |
007e251f AG |
698 | * |
699 | * Clones the rpc client and sets up a new RPC program. This is mainly | |
700 | * of use for enabling different RPC programs to share the same transport. | |
701 | * The Sun NFSv2/v3 ACL protocol can do this. | |
702 | */ | |
703 | struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old, | |
a613fa16 | 704 | const struct rpc_program *program, |
89eb21c3 | 705 | u32 vers) |
007e251f | 706 | { |
f994c43d TM |
707 | struct rpc_create_args args = { |
708 | .program = program, | |
709 | .prognumber = program->number, | |
710 | .version = vers, | |
711 | .authflavor = old->cl_auth->au_flavor, | |
712 | .client_name = old->cl_principal, | |
713 | }; | |
007e251f | 714 | struct rpc_clnt *clnt; |
007e251f AG |
715 | int err; |
716 | ||
f994c43d | 717 | clnt = __rpc_clone_client(&args, old); |
007e251f AG |
718 | if (IS_ERR(clnt)) |
719 | goto out; | |
caabea8a | 720 | err = rpc_ping(clnt); |
007e251f AG |
721 | if (err != 0) { |
722 | rpc_shutdown_client(clnt); | |
723 | clnt = ERR_PTR(err); | |
724 | } | |
cca5172a | 725 | out: |
007e251f AG |
726 | return clnt; |
727 | } | |
e8914c65 | 728 | EXPORT_SYMBOL_GPL(rpc_bind_new_program); |
007e251f | 729 | |
58f9612c TM |
730 | void rpc_task_release_client(struct rpc_task *task) |
731 | { | |
732 | struct rpc_clnt *clnt = task->tk_client; | |
733 | ||
734 | if (clnt != NULL) { | |
735 | /* Remove from client task list */ | |
736 | spin_lock(&clnt->cl_lock); | |
737 | list_del(&task->tk_task); | |
738 | spin_unlock(&clnt->cl_lock); | |
739 | task->tk_client = NULL; | |
740 | ||
741 | rpc_release_client(clnt); | |
742 | } | |
743 | } | |
744 | ||
745 | static | |
746 | void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt) | |
747 | { | |
748 | if (clnt != NULL) { | |
749 | rpc_task_release_client(task); | |
750 | task->tk_client = clnt; | |
006abe88 | 751 | atomic_inc(&clnt->cl_count); |
58f9612c TM |
752 | if (clnt->cl_softrtry) |
753 | task->tk_flags |= RPC_TASK_SOFT; | |
a564b8f0 MG |
754 | if (sk_memalloc_socks()) { |
755 | struct rpc_xprt *xprt; | |
756 | ||
757 | rcu_read_lock(); | |
758 | xprt = rcu_dereference(clnt->cl_xprt); | |
759 | if (xprt->swapper) | |
760 | task->tk_flags |= RPC_TASK_SWAPPER; | |
761 | rcu_read_unlock(); | |
762 | } | |
58f9612c TM |
763 | /* Add to the client's list of all tasks */ |
764 | spin_lock(&clnt->cl_lock); | |
765 | list_add_tail(&task->tk_task, &clnt->cl_tasks); | |
766 | spin_unlock(&clnt->cl_lock); | |
767 | } | |
768 | } | |
769 | ||
cbdabc7f AA |
770 | void rpc_task_reset_client(struct rpc_task *task, struct rpc_clnt *clnt) |
771 | { | |
772 | rpc_task_release_client(task); | |
773 | rpc_task_set_client(task, clnt); | |
774 | } | |
775 | EXPORT_SYMBOL_GPL(rpc_task_reset_client); | |
776 | ||
777 | ||
58f9612c TM |
778 | static void |
779 | rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg) | |
780 | { | |
781 | if (msg != NULL) { | |
782 | task->tk_msg.rpc_proc = msg->rpc_proc; | |
783 | task->tk_msg.rpc_argp = msg->rpc_argp; | |
784 | task->tk_msg.rpc_resp = msg->rpc_resp; | |
a17c2153 TM |
785 | if (msg->rpc_cred != NULL) |
786 | task->tk_msg.rpc_cred = get_rpccred(msg->rpc_cred); | |
58f9612c TM |
787 | } |
788 | } | |
789 | ||
1da177e4 LT |
790 | /* |
791 | * Default callback for async RPC calls | |
792 | */ | |
793 | static void | |
963d8fe5 | 794 | rpc_default_callback(struct rpc_task *task, void *data) |
1da177e4 LT |
795 | { |
796 | } | |
797 | ||
963d8fe5 TM |
798 | static const struct rpc_call_ops rpc_default_ops = { |
799 | .rpc_call_done = rpc_default_callback, | |
800 | }; | |
801 | ||
c970aa85 TM |
802 | /** |
803 | * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it | |
804 | * @task_setup_data: pointer to task initialisation data | |
805 | */ | |
806 | struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data) | |
6e5b70e9 | 807 | { |
19445b99 | 808 | struct rpc_task *task; |
6e5b70e9 | 809 | |
84115e1c | 810 | task = rpc_new_task(task_setup_data); |
19445b99 | 811 | if (IS_ERR(task)) |
50859259 | 812 | goto out; |
6e5b70e9 | 813 | |
58f9612c TM |
814 | rpc_task_set_client(task, task_setup_data->rpc_client); |
815 | rpc_task_set_rpc_message(task, task_setup_data->rpc_message); | |
816 | ||
58f9612c TM |
817 | if (task->tk_action == NULL) |
818 | rpc_call_start(task); | |
819 | ||
6e5b70e9 TM |
820 | atomic_inc(&task->tk_count); |
821 | rpc_execute(task); | |
6e5b70e9 | 822 | out: |
19445b99 | 823 | return task; |
6e5b70e9 | 824 | } |
c970aa85 | 825 | EXPORT_SYMBOL_GPL(rpc_run_task); |
6e5b70e9 TM |
826 | |
827 | /** | |
828 | * rpc_call_sync - Perform a synchronous RPC call | |
829 | * @clnt: pointer to RPC client | |
830 | * @msg: RPC call parameters | |
831 | * @flags: RPC call flags | |
1da177e4 | 832 | */ |
cbc20059 | 833 | int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags) |
1da177e4 LT |
834 | { |
835 | struct rpc_task *task; | |
84115e1c TM |
836 | struct rpc_task_setup task_setup_data = { |
837 | .rpc_client = clnt, | |
838 | .rpc_message = msg, | |
839 | .callback_ops = &rpc_default_ops, | |
840 | .flags = flags, | |
841 | }; | |
6e5b70e9 | 842 | int status; |
1da177e4 | 843 | |
50d2bdb1 WAA |
844 | WARN_ON_ONCE(flags & RPC_TASK_ASYNC); |
845 | if (flags & RPC_TASK_ASYNC) { | |
846 | rpc_release_calldata(task_setup_data.callback_ops, | |
847 | task_setup_data.callback_data); | |
848 | return -EINVAL; | |
849 | } | |
1da177e4 | 850 | |
c970aa85 | 851 | task = rpc_run_task(&task_setup_data); |
6e5b70e9 TM |
852 | if (IS_ERR(task)) |
853 | return PTR_ERR(task); | |
e60859ac | 854 | status = task->tk_status; |
bde8f00c | 855 | rpc_put_task(task); |
1da177e4 LT |
856 | return status; |
857 | } | |
e8914c65 | 858 | EXPORT_SYMBOL_GPL(rpc_call_sync); |
1da177e4 | 859 | |
6e5b70e9 TM |
860 | /** |
861 | * rpc_call_async - Perform an asynchronous RPC call | |
862 | * @clnt: pointer to RPC client | |
863 | * @msg: RPC call parameters | |
864 | * @flags: RPC call flags | |
65b6e42c | 865 | * @tk_ops: RPC call ops |
6e5b70e9 | 866 | * @data: user call data |
1da177e4 LT |
867 | */ |
868 | int | |
cbc20059 | 869 | rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags, |
963d8fe5 | 870 | const struct rpc_call_ops *tk_ops, void *data) |
1da177e4 LT |
871 | { |
872 | struct rpc_task *task; | |
84115e1c TM |
873 | struct rpc_task_setup task_setup_data = { |
874 | .rpc_client = clnt, | |
875 | .rpc_message = msg, | |
876 | .callback_ops = tk_ops, | |
877 | .callback_data = data, | |
878 | .flags = flags|RPC_TASK_ASYNC, | |
879 | }; | |
1da177e4 | 880 | |
c970aa85 | 881 | task = rpc_run_task(&task_setup_data); |
6e5b70e9 TM |
882 | if (IS_ERR(task)) |
883 | return PTR_ERR(task); | |
884 | rpc_put_task(task); | |
885 | return 0; | |
1da177e4 | 886 | } |
e8914c65 | 887 | EXPORT_SYMBOL_GPL(rpc_call_async); |
1da177e4 | 888 | |
9e00abc3 | 889 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
55ae1aab RL |
890 | /** |
891 | * rpc_run_bc_task - Allocate a new RPC task for backchannel use, then run | |
892 | * rpc_execute against it | |
7a73fdde JSR |
893 | * @req: RPC request |
894 | * @tk_ops: RPC call ops | |
55ae1aab RL |
895 | */ |
896 | struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req, | |
7a73fdde | 897 | const struct rpc_call_ops *tk_ops) |
55ae1aab RL |
898 | { |
899 | struct rpc_task *task; | |
900 | struct xdr_buf *xbufp = &req->rq_snd_buf; | |
901 | struct rpc_task_setup task_setup_data = { | |
902 | .callback_ops = tk_ops, | |
903 | }; | |
904 | ||
905 | dprintk("RPC: rpc_run_bc_task req= %p\n", req); | |
906 | /* | |
907 | * Create an rpc_task to send the data | |
908 | */ | |
909 | task = rpc_new_task(&task_setup_data); | |
19445b99 | 910 | if (IS_ERR(task)) { |
55ae1aab RL |
911 | xprt_free_bc_request(req); |
912 | goto out; | |
913 | } | |
914 | task->tk_rqstp = req; | |
915 | ||
916 | /* | |
917 | * Set up the xdr_buf length. | |
918 | * This also indicates that the buffer is XDR encoded already. | |
919 | */ | |
920 | xbufp->len = xbufp->head[0].iov_len + xbufp->page_len + | |
921 | xbufp->tail[0].iov_len; | |
922 | ||
923 | task->tk_action = call_bc_transmit; | |
924 | atomic_inc(&task->tk_count); | |
9a6478f6 | 925 | WARN_ON_ONCE(atomic_read(&task->tk_count) != 2); |
55ae1aab RL |
926 | rpc_execute(task); |
927 | ||
928 | out: | |
929 | dprintk("RPC: rpc_run_bc_task: task= %p\n", task); | |
930 | return task; | |
931 | } | |
9e00abc3 | 932 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
55ae1aab | 933 | |
77de2c59 TM |
934 | void |
935 | rpc_call_start(struct rpc_task *task) | |
936 | { | |
937 | task->tk_action = call_start; | |
938 | } | |
939 | EXPORT_SYMBOL_GPL(rpc_call_start); | |
940 | ||
ed39440a CL |
941 | /** |
942 | * rpc_peeraddr - extract remote peer address from clnt's xprt | |
943 | * @clnt: RPC client structure | |
944 | * @buf: target buffer | |
65b6e42c | 945 | * @bufsize: length of target buffer |
ed39440a CL |
946 | * |
947 | * Returns the number of bytes that are actually in the stored address. | |
948 | */ | |
949 | size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize) | |
950 | { | |
951 | size_t bytes; | |
2446ab60 TM |
952 | struct rpc_xprt *xprt; |
953 | ||
954 | rcu_read_lock(); | |
955 | xprt = rcu_dereference(clnt->cl_xprt); | |
ed39440a | 956 | |
2446ab60 | 957 | bytes = xprt->addrlen; |
ed39440a CL |
958 | if (bytes > bufsize) |
959 | bytes = bufsize; | |
2446ab60 TM |
960 | memcpy(buf, &xprt->addr, bytes); |
961 | rcu_read_unlock(); | |
962 | ||
963 | return bytes; | |
ed39440a | 964 | } |
b86acd50 | 965 | EXPORT_SYMBOL_GPL(rpc_peeraddr); |
ed39440a | 966 | |
f425eba4 CL |
967 | /** |
968 | * rpc_peeraddr2str - return remote peer address in printable format | |
969 | * @clnt: RPC client structure | |
970 | * @format: address format | |
971 | * | |
2446ab60 TM |
972 | * NB: the lifetime of the memory referenced by the returned pointer is |
973 | * the same as the rpc_xprt itself. As long as the caller uses this | |
974 | * pointer, it must hold the RCU read lock. | |
f425eba4 | 975 | */ |
b454ae90 CL |
976 | const char *rpc_peeraddr2str(struct rpc_clnt *clnt, |
977 | enum rpc_display_format_t format) | |
f425eba4 | 978 | { |
2446ab60 TM |
979 | struct rpc_xprt *xprt; |
980 | ||
981 | xprt = rcu_dereference(clnt->cl_xprt); | |
7559c7a2 CL |
982 | |
983 | if (xprt->address_strings[format] != NULL) | |
984 | return xprt->address_strings[format]; | |
985 | else | |
986 | return "unprintable"; | |
f425eba4 | 987 | } |
b86acd50 | 988 | EXPORT_SYMBOL_GPL(rpc_peeraddr2str); |
f425eba4 | 989 | |
2e738fdc CL |
990 | static const struct sockaddr_in rpc_inaddr_loopback = { |
991 | .sin_family = AF_INET, | |
992 | .sin_addr.s_addr = htonl(INADDR_ANY), | |
993 | }; | |
994 | ||
995 | static const struct sockaddr_in6 rpc_in6addr_loopback = { | |
996 | .sin6_family = AF_INET6, | |
997 | .sin6_addr = IN6ADDR_ANY_INIT, | |
998 | }; | |
999 | ||
1000 | /* | |
1001 | * Try a getsockname() on a connected datagram socket. Using a | |
1002 | * connected datagram socket prevents leaving a socket in TIME_WAIT. | |
1003 | * This conserves the ephemeral port number space. | |
1004 | * | |
1005 | * Returns zero and fills in "buf" if successful; otherwise, a | |
1006 | * negative errno is returned. | |
1007 | */ | |
1008 | static int rpc_sockname(struct net *net, struct sockaddr *sap, size_t salen, | |
1009 | struct sockaddr *buf, int buflen) | |
1010 | { | |
1011 | struct socket *sock; | |
1012 | int err; | |
1013 | ||
1014 | err = __sock_create(net, sap->sa_family, | |
1015 | SOCK_DGRAM, IPPROTO_UDP, &sock, 1); | |
1016 | if (err < 0) { | |
1017 | dprintk("RPC: can't create UDP socket (%d)\n", err); | |
1018 | goto out; | |
1019 | } | |
1020 | ||
1021 | switch (sap->sa_family) { | |
1022 | case AF_INET: | |
1023 | err = kernel_bind(sock, | |
1024 | (struct sockaddr *)&rpc_inaddr_loopback, | |
1025 | sizeof(rpc_inaddr_loopback)); | |
1026 | break; | |
1027 | case AF_INET6: | |
1028 | err = kernel_bind(sock, | |
1029 | (struct sockaddr *)&rpc_in6addr_loopback, | |
1030 | sizeof(rpc_in6addr_loopback)); | |
1031 | break; | |
1032 | default: | |
1033 | err = -EAFNOSUPPORT; | |
1034 | goto out; | |
1035 | } | |
1036 | if (err < 0) { | |
1037 | dprintk("RPC: can't bind UDP socket (%d)\n", err); | |
1038 | goto out_release; | |
1039 | } | |
1040 | ||
1041 | err = kernel_connect(sock, sap, salen, 0); | |
1042 | if (err < 0) { | |
1043 | dprintk("RPC: can't connect UDP socket (%d)\n", err); | |
1044 | goto out_release; | |
1045 | } | |
1046 | ||
1047 | err = kernel_getsockname(sock, buf, &buflen); | |
1048 | if (err < 0) { | |
1049 | dprintk("RPC: getsockname failed (%d)\n", err); | |
1050 | goto out_release; | |
1051 | } | |
1052 | ||
1053 | err = 0; | |
1054 | if (buf->sa_family == AF_INET6) { | |
1055 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)buf; | |
1056 | sin6->sin6_scope_id = 0; | |
1057 | } | |
1058 | dprintk("RPC: %s succeeded\n", __func__); | |
1059 | ||
1060 | out_release: | |
1061 | sock_release(sock); | |
1062 | out: | |
1063 | return err; | |
1064 | } | |
1065 | ||
1066 | /* | |
1067 | * Scraping a connected socket failed, so we don't have a useable | |
1068 | * local address. Fallback: generate an address that will prevent | |
1069 | * the server from calling us back. | |
1070 | * | |
1071 | * Returns zero and fills in "buf" if successful; otherwise, a | |
1072 | * negative errno is returned. | |
1073 | */ | |
1074 | static int rpc_anyaddr(int family, struct sockaddr *buf, size_t buflen) | |
1075 | { | |
1076 | switch (family) { | |
1077 | case AF_INET: | |
1078 | if (buflen < sizeof(rpc_inaddr_loopback)) | |
1079 | return -EINVAL; | |
1080 | memcpy(buf, &rpc_inaddr_loopback, | |
1081 | sizeof(rpc_inaddr_loopback)); | |
1082 | break; | |
1083 | case AF_INET6: | |
1084 | if (buflen < sizeof(rpc_in6addr_loopback)) | |
1085 | return -EINVAL; | |
1086 | memcpy(buf, &rpc_in6addr_loopback, | |
1087 | sizeof(rpc_in6addr_loopback)); | |
1088 | default: | |
1089 | dprintk("RPC: %s: address family not supported\n", | |
1090 | __func__); | |
1091 | return -EAFNOSUPPORT; | |
1092 | } | |
1093 | dprintk("RPC: %s: succeeded\n", __func__); | |
1094 | return 0; | |
1095 | } | |
1096 | ||
1097 | /** | |
1098 | * rpc_localaddr - discover local endpoint address for an RPC client | |
1099 | * @clnt: RPC client structure | |
1100 | * @buf: target buffer | |
1101 | * @buflen: size of target buffer, in bytes | |
1102 | * | |
1103 | * Returns zero and fills in "buf" and "buflen" if successful; | |
1104 | * otherwise, a negative errno is returned. | |
1105 | * | |
1106 | * This works even if the underlying transport is not currently connected, | |
1107 | * or if the upper layer never previously provided a source address. | |
1108 | * | |
1109 | * The result of this function call is transient: multiple calls in | |
1110 | * succession may give different results, depending on how local | |
1111 | * networking configuration changes over time. | |
1112 | */ | |
1113 | int rpc_localaddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t buflen) | |
1114 | { | |
1115 | struct sockaddr_storage address; | |
1116 | struct sockaddr *sap = (struct sockaddr *)&address; | |
1117 | struct rpc_xprt *xprt; | |
1118 | struct net *net; | |
1119 | size_t salen; | |
1120 | int err; | |
1121 | ||
1122 | rcu_read_lock(); | |
1123 | xprt = rcu_dereference(clnt->cl_xprt); | |
1124 | salen = xprt->addrlen; | |
1125 | memcpy(sap, &xprt->addr, salen); | |
1126 | net = get_net(xprt->xprt_net); | |
1127 | rcu_read_unlock(); | |
1128 | ||
1129 | rpc_set_port(sap, 0); | |
1130 | err = rpc_sockname(net, sap, salen, buf, buflen); | |
1131 | put_net(net); | |
1132 | if (err != 0) | |
1133 | /* Couldn't discover local address, return ANYADDR */ | |
1134 | return rpc_anyaddr(sap->sa_family, buf, buflen); | |
1135 | return 0; | |
1136 | } | |
1137 | EXPORT_SYMBOL_GPL(rpc_localaddr); | |
1138 | ||
1da177e4 LT |
1139 | void |
1140 | rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize) | |
1141 | { | |
2446ab60 TM |
1142 | struct rpc_xprt *xprt; |
1143 | ||
1144 | rcu_read_lock(); | |
1145 | xprt = rcu_dereference(clnt->cl_xprt); | |
470056c2 CL |
1146 | if (xprt->ops->set_buffer_size) |
1147 | xprt->ops->set_buffer_size(xprt, sndsize, rcvsize); | |
2446ab60 | 1148 | rcu_read_unlock(); |
1da177e4 | 1149 | } |
e8914c65 | 1150 | EXPORT_SYMBOL_GPL(rpc_setbufsize); |
1da177e4 | 1151 | |
2446ab60 TM |
1152 | /** |
1153 | * rpc_protocol - Get transport protocol number for an RPC client | |
1154 | * @clnt: RPC client to query | |
1155 | * | |
1156 | */ | |
1157 | int rpc_protocol(struct rpc_clnt *clnt) | |
1158 | { | |
1159 | int protocol; | |
1160 | ||
1161 | rcu_read_lock(); | |
1162 | protocol = rcu_dereference(clnt->cl_xprt)->prot; | |
1163 | rcu_read_unlock(); | |
1164 | return protocol; | |
1165 | } | |
1166 | EXPORT_SYMBOL_GPL(rpc_protocol); | |
1167 | ||
1168 | /** | |
1169 | * rpc_net_ns - Get the network namespace for this RPC client | |
1170 | * @clnt: RPC client to query | |
1171 | * | |
1172 | */ | |
1173 | struct net *rpc_net_ns(struct rpc_clnt *clnt) | |
1174 | { | |
1175 | struct net *ret; | |
1176 | ||
1177 | rcu_read_lock(); | |
1178 | ret = rcu_dereference(clnt->cl_xprt)->xprt_net; | |
1179 | rcu_read_unlock(); | |
1180 | return ret; | |
1181 | } | |
1182 | EXPORT_SYMBOL_GPL(rpc_net_ns); | |
1183 | ||
1184 | /** | |
1185 | * rpc_max_payload - Get maximum payload size for a transport, in bytes | |
1186 | * @clnt: RPC client to query | |
1da177e4 LT |
1187 | * |
1188 | * For stream transports, this is one RPC record fragment (see RFC | |
1189 | * 1831), as we don't support multi-record requests yet. For datagram | |
1190 | * transports, this is the size of an IP packet minus the IP, UDP, and | |
1191 | * RPC header sizes. | |
1192 | */ | |
1193 | size_t rpc_max_payload(struct rpc_clnt *clnt) | |
1194 | { | |
2446ab60 TM |
1195 | size_t ret; |
1196 | ||
1197 | rcu_read_lock(); | |
1198 | ret = rcu_dereference(clnt->cl_xprt)->max_payload; | |
1199 | rcu_read_unlock(); | |
1200 | return ret; | |
1da177e4 | 1201 | } |
b86acd50 | 1202 | EXPORT_SYMBOL_GPL(rpc_max_payload); |
1da177e4 | 1203 | |
35f5a422 CL |
1204 | /** |
1205 | * rpc_force_rebind - force transport to check that remote port is unchanged | |
1206 | * @clnt: client to rebind | |
1207 | * | |
1208 | */ | |
1209 | void rpc_force_rebind(struct rpc_clnt *clnt) | |
1210 | { | |
2446ab60 TM |
1211 | if (clnt->cl_autobind) { |
1212 | rcu_read_lock(); | |
1213 | xprt_clear_bound(rcu_dereference(clnt->cl_xprt)); | |
1214 | rcu_read_unlock(); | |
1215 | } | |
35f5a422 | 1216 | } |
b86acd50 | 1217 | EXPORT_SYMBOL_GPL(rpc_force_rebind); |
35f5a422 | 1218 | |
aae2006e AA |
1219 | /* |
1220 | * Restart an (async) RPC call from the call_prepare state. | |
1221 | * Usually called from within the exit handler. | |
1222 | */ | |
f1f88fc7 | 1223 | int |
aae2006e AA |
1224 | rpc_restart_call_prepare(struct rpc_task *task) |
1225 | { | |
1226 | if (RPC_ASSASSINATED(task)) | |
f1f88fc7 | 1227 | return 0; |
d00c5d43 TM |
1228 | task->tk_action = call_start; |
1229 | if (task->tk_ops->rpc_call_prepare != NULL) | |
1230 | task->tk_action = rpc_prepare_task; | |
f1f88fc7 | 1231 | return 1; |
aae2006e AA |
1232 | } |
1233 | EXPORT_SYMBOL_GPL(rpc_restart_call_prepare); | |
1234 | ||
1da177e4 LT |
1235 | /* |
1236 | * Restart an (async) RPC call. Usually called from within the | |
1237 | * exit handler. | |
1238 | */ | |
f1f88fc7 | 1239 | int |
1da177e4 LT |
1240 | rpc_restart_call(struct rpc_task *task) |
1241 | { | |
1242 | if (RPC_ASSASSINATED(task)) | |
f1f88fc7 | 1243 | return 0; |
1da177e4 | 1244 | task->tk_action = call_start; |
f1f88fc7 | 1245 | return 1; |
1da177e4 | 1246 | } |
e8914c65 | 1247 | EXPORT_SYMBOL_GPL(rpc_restart_call); |
1da177e4 | 1248 | |
3748f1e4 CL |
1249 | #ifdef RPC_DEBUG |
1250 | static const char *rpc_proc_name(const struct rpc_task *task) | |
1251 | { | |
1252 | const struct rpc_procinfo *proc = task->tk_msg.rpc_proc; | |
1253 | ||
1254 | if (proc) { | |
1255 | if (proc->p_name) | |
1256 | return proc->p_name; | |
1257 | else | |
1258 | return "NULL"; | |
1259 | } else | |
1260 | return "no proc"; | |
1261 | } | |
1262 | #endif | |
1263 | ||
1da177e4 LT |
1264 | /* |
1265 | * 0. Initial state | |
1266 | * | |
1267 | * Other FSM states can be visited zero or more times, but | |
1268 | * this state is visited exactly once for each RPC. | |
1269 | */ | |
1270 | static void | |
1271 | call_start(struct rpc_task *task) | |
1272 | { | |
1273 | struct rpc_clnt *clnt = task->tk_client; | |
1274 | ||
3748f1e4 | 1275 | dprintk("RPC: %5u call_start %s%d proc %s (%s)\n", task->tk_pid, |
46121cf7 | 1276 | clnt->cl_protname, clnt->cl_vers, |
3748f1e4 | 1277 | rpc_proc_name(task), |
46121cf7 | 1278 | (RPC_IS_ASYNC(task) ? "async" : "sync")); |
1da177e4 LT |
1279 | |
1280 | /* Increment call count */ | |
1281 | task->tk_msg.rpc_proc->p_count++; | |
1282 | clnt->cl_stats->rpccnt++; | |
1283 | task->tk_action = call_reserve; | |
1284 | } | |
1285 | ||
1286 | /* | |
1287 | * 1. Reserve an RPC call slot | |
1288 | */ | |
1289 | static void | |
1290 | call_reserve(struct rpc_task *task) | |
1291 | { | |
46121cf7 | 1292 | dprint_status(task); |
1da177e4 | 1293 | |
1da177e4 LT |
1294 | task->tk_status = 0; |
1295 | task->tk_action = call_reserveresult; | |
1296 | xprt_reserve(task); | |
1297 | } | |
1298 | ||
1299 | /* | |
1300 | * 1b. Grok the result of xprt_reserve() | |
1301 | */ | |
1302 | static void | |
1303 | call_reserveresult(struct rpc_task *task) | |
1304 | { | |
1305 | int status = task->tk_status; | |
1306 | ||
46121cf7 | 1307 | dprint_status(task); |
1da177e4 LT |
1308 | |
1309 | /* | |
1310 | * After a call to xprt_reserve(), we must have either | |
1311 | * a request slot or else an error status. | |
1312 | */ | |
1313 | task->tk_status = 0; | |
1314 | if (status >= 0) { | |
1315 | if (task->tk_rqstp) { | |
f2d47d02 | 1316 | task->tk_action = call_refresh; |
1da177e4 LT |
1317 | return; |
1318 | } | |
1319 | ||
1320 | printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n", | |
0dc47877 | 1321 | __func__, status); |
1da177e4 LT |
1322 | rpc_exit(task, -EIO); |
1323 | return; | |
1324 | } | |
1325 | ||
1326 | /* | |
1327 | * Even though there was an error, we may have acquired | |
1328 | * a request slot somehow. Make sure not to leak it. | |
1329 | */ | |
1330 | if (task->tk_rqstp) { | |
1331 | printk(KERN_ERR "%s: status=%d, request allocated anyway\n", | |
0dc47877 | 1332 | __func__, status); |
1da177e4 LT |
1333 | xprt_release(task); |
1334 | } | |
1335 | ||
1336 | switch (status) { | |
1afeaf5c TM |
1337 | case -ENOMEM: |
1338 | rpc_delay(task, HZ >> 2); | |
1da177e4 LT |
1339 | case -EAGAIN: /* woken up; retry */ |
1340 | task->tk_action = call_reserve; | |
1341 | return; | |
1342 | case -EIO: /* probably a shutdown */ | |
1343 | break; | |
1344 | default: | |
1345 | printk(KERN_ERR "%s: unrecognized error %d, exiting\n", | |
0dc47877 | 1346 | __func__, status); |
1da177e4 LT |
1347 | break; |
1348 | } | |
1349 | rpc_exit(task, status); | |
1350 | } | |
1351 | ||
1352 | /* | |
55576244 BF |
1353 | * 2. Bind and/or refresh the credentials |
1354 | */ | |
1355 | static void | |
1356 | call_refresh(struct rpc_task *task) | |
1357 | { | |
1358 | dprint_status(task); | |
1359 | ||
1360 | task->tk_action = call_refreshresult; | |
1361 | task->tk_status = 0; | |
1362 | task->tk_client->cl_stats->rpcauthrefresh++; | |
1363 | rpcauth_refreshcred(task); | |
1364 | } | |
1365 | ||
1366 | /* | |
1367 | * 2a. Process the results of a credential refresh | |
1368 | */ | |
1369 | static void | |
1370 | call_refreshresult(struct rpc_task *task) | |
1371 | { | |
1372 | int status = task->tk_status; | |
1373 | ||
1374 | dprint_status(task); | |
1375 | ||
1376 | task->tk_status = 0; | |
5fc43978 | 1377 | task->tk_action = call_refresh; |
55576244 | 1378 | switch (status) { |
5fc43978 TM |
1379 | case 0: |
1380 | if (rpcauth_uptodatecred(task)) | |
1381 | task->tk_action = call_allocate; | |
55576244 BF |
1382 | return; |
1383 | case -ETIMEDOUT: | |
1384 | rpc_delay(task, 3*HZ); | |
eb96d5c9 | 1385 | case -EKEYEXPIRED: |
5fc43978 TM |
1386 | case -EAGAIN: |
1387 | status = -EACCES; | |
1388 | if (!task->tk_cred_retry) | |
1389 | break; | |
1390 | task->tk_cred_retry--; | |
1391 | dprintk("RPC: %5u %s: retry refresh creds\n", | |
1392 | task->tk_pid, __func__); | |
1393 | return; | |
55576244 | 1394 | } |
5fc43978 TM |
1395 | dprintk("RPC: %5u %s: refresh creds failed with error %d\n", |
1396 | task->tk_pid, __func__, status); | |
1397 | rpc_exit(task, status); | |
55576244 BF |
1398 | } |
1399 | ||
1400 | /* | |
1401 | * 2b. Allocate the buffer. For details, see sched.c:rpc_malloc. | |
02107148 | 1402 | * (Note: buffer memory is freed in xprt_release). |
1da177e4 LT |
1403 | */ |
1404 | static void | |
1405 | call_allocate(struct rpc_task *task) | |
1406 | { | |
f2d47d02 | 1407 | unsigned int slack = task->tk_rqstp->rq_cred->cr_auth->au_cslack; |
02107148 CL |
1408 | struct rpc_rqst *req = task->tk_rqstp; |
1409 | struct rpc_xprt *xprt = task->tk_xprt; | |
2bea90d4 | 1410 | struct rpc_procinfo *proc = task->tk_msg.rpc_proc; |
1da177e4 | 1411 | |
46121cf7 CL |
1412 | dprint_status(task); |
1413 | ||
2bea90d4 | 1414 | task->tk_status = 0; |
f2d47d02 | 1415 | task->tk_action = call_bind; |
2bea90d4 | 1416 | |
02107148 | 1417 | if (req->rq_buffer) |
1da177e4 LT |
1418 | return; |
1419 | ||
2bea90d4 CL |
1420 | if (proc->p_proc != 0) { |
1421 | BUG_ON(proc->p_arglen == 0); | |
1422 | if (proc->p_decode != NULL) | |
1423 | BUG_ON(proc->p_replen == 0); | |
1424 | } | |
1da177e4 | 1425 | |
2bea90d4 CL |
1426 | /* |
1427 | * Calculate the size (in quads) of the RPC call | |
1428 | * and reply headers, and convert both values | |
1429 | * to byte sizes. | |
1430 | */ | |
1431 | req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen; | |
1432 | req->rq_callsize <<= 2; | |
1433 | req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen; | |
1434 | req->rq_rcvsize <<= 2; | |
1435 | ||
c5a4dd8b CL |
1436 | req->rq_buffer = xprt->ops->buf_alloc(task, |
1437 | req->rq_callsize + req->rq_rcvsize); | |
2bea90d4 | 1438 | if (req->rq_buffer != NULL) |
1da177e4 | 1439 | return; |
46121cf7 CL |
1440 | |
1441 | dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid); | |
1da177e4 | 1442 | |
5afa9133 | 1443 | if (RPC_IS_ASYNC(task) || !fatal_signal_pending(current)) { |
b6e9c713 | 1444 | task->tk_action = call_allocate; |
1da177e4 LT |
1445 | rpc_delay(task, HZ>>4); |
1446 | return; | |
1447 | } | |
1448 | ||
1449 | rpc_exit(task, -ERESTARTSYS); | |
1450 | } | |
1451 | ||
940e3318 TM |
1452 | static inline int |
1453 | rpc_task_need_encode(struct rpc_task *task) | |
1454 | { | |
1455 | return task->tk_rqstp->rq_snd_buf.len == 0; | |
1456 | } | |
1457 | ||
1458 | static inline void | |
1459 | rpc_task_force_reencode(struct rpc_task *task) | |
1460 | { | |
1461 | task->tk_rqstp->rq_snd_buf.len = 0; | |
2574cc9f | 1462 | task->tk_rqstp->rq_bytes_sent = 0; |
940e3318 TM |
1463 | } |
1464 | ||
2bea90d4 CL |
1465 | static inline void |
1466 | rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len) | |
1467 | { | |
1468 | buf->head[0].iov_base = start; | |
1469 | buf->head[0].iov_len = len; | |
1470 | buf->tail[0].iov_len = 0; | |
1471 | buf->page_len = 0; | |
4f22ccc3 | 1472 | buf->flags = 0; |
2bea90d4 CL |
1473 | buf->len = 0; |
1474 | buf->buflen = len; | |
1475 | } | |
1476 | ||
1da177e4 LT |
1477 | /* |
1478 | * 3. Encode arguments of an RPC call | |
1479 | */ | |
1480 | static void | |
b0e1c57e | 1481 | rpc_xdr_encode(struct rpc_task *task) |
1da177e4 | 1482 | { |
1da177e4 | 1483 | struct rpc_rqst *req = task->tk_rqstp; |
9f06c719 | 1484 | kxdreproc_t encode; |
d8ed029d | 1485 | __be32 *p; |
1da177e4 | 1486 | |
46121cf7 | 1487 | dprint_status(task); |
1da177e4 | 1488 | |
2bea90d4 CL |
1489 | rpc_xdr_buf_init(&req->rq_snd_buf, |
1490 | req->rq_buffer, | |
1491 | req->rq_callsize); | |
1492 | rpc_xdr_buf_init(&req->rq_rcv_buf, | |
1493 | (char *)req->rq_buffer + req->rq_callsize, | |
1494 | req->rq_rcvsize); | |
1da177e4 | 1495 | |
b0e1c57e CL |
1496 | p = rpc_encode_header(task); |
1497 | if (p == NULL) { | |
1498 | printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n"); | |
1da177e4 LT |
1499 | rpc_exit(task, -EIO); |
1500 | return; | |
1501 | } | |
b0e1c57e CL |
1502 | |
1503 | encode = task->tk_msg.rpc_proc->p_encode; | |
f3680312 BF |
1504 | if (encode == NULL) |
1505 | return; | |
1506 | ||
1507 | task->tk_status = rpcauth_wrap_req(task, encode, req, p, | |
1508 | task->tk_msg.rpc_argp); | |
1da177e4 LT |
1509 | } |
1510 | ||
1511 | /* | |
1512 | * 4. Get the server port number if not yet set | |
1513 | */ | |
1514 | static void | |
1515 | call_bind(struct rpc_task *task) | |
1516 | { | |
ec739ef0 | 1517 | struct rpc_xprt *xprt = task->tk_xprt; |
1da177e4 | 1518 | |
46121cf7 | 1519 | dprint_status(task); |
1da177e4 | 1520 | |
da351878 | 1521 | task->tk_action = call_connect; |
ec739ef0 | 1522 | if (!xprt_bound(xprt)) { |
da351878 | 1523 | task->tk_action = call_bind_status; |
ec739ef0 | 1524 | task->tk_timeout = xprt->bind_timeout; |
bbf7c1dd | 1525 | xprt->ops->rpcbind(task); |
1da177e4 LT |
1526 | } |
1527 | } | |
1528 | ||
1529 | /* | |
da351878 CL |
1530 | * 4a. Sort out bind result |
1531 | */ | |
1532 | static void | |
1533 | call_bind_status(struct rpc_task *task) | |
1534 | { | |
906462af | 1535 | int status = -EIO; |
da351878 CL |
1536 | |
1537 | if (task->tk_status >= 0) { | |
46121cf7 | 1538 | dprint_status(task); |
da351878 CL |
1539 | task->tk_status = 0; |
1540 | task->tk_action = call_connect; | |
1541 | return; | |
1542 | } | |
1543 | ||
5753cba1 | 1544 | trace_rpc_bind_status(task); |
da351878 | 1545 | switch (task->tk_status) { |
381ba74a TM |
1546 | case -ENOMEM: |
1547 | dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid); | |
1548 | rpc_delay(task, HZ >> 2); | |
2429cbf6 | 1549 | goto retry_timeout; |
da351878 | 1550 | case -EACCES: |
46121cf7 CL |
1551 | dprintk("RPC: %5u remote rpcbind: RPC program/version " |
1552 | "unavailable\n", task->tk_pid); | |
b79dc8ce CL |
1553 | /* fail immediately if this is an RPC ping */ |
1554 | if (task->tk_msg.rpc_proc->p_proc == 0) { | |
1555 | status = -EOPNOTSUPP; | |
1556 | break; | |
1557 | } | |
0b760113 TM |
1558 | if (task->tk_rebind_retry == 0) |
1559 | break; | |
1560 | task->tk_rebind_retry--; | |
ea635a51 | 1561 | rpc_delay(task, 3*HZ); |
da45828e | 1562 | goto retry_timeout; |
da351878 | 1563 | case -ETIMEDOUT: |
46121cf7 | 1564 | dprintk("RPC: %5u rpcbind request timed out\n", |
da351878 | 1565 | task->tk_pid); |
da45828e | 1566 | goto retry_timeout; |
da351878 | 1567 | case -EPFNOSUPPORT: |
906462af | 1568 | /* server doesn't support any rpcbind version we know of */ |
012da158 | 1569 | dprintk("RPC: %5u unrecognized remote rpcbind service\n", |
da351878 CL |
1570 | task->tk_pid); |
1571 | break; | |
1572 | case -EPROTONOSUPPORT: | |
00a6e7bb | 1573 | dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n", |
da351878 | 1574 | task->tk_pid); |
00a6e7bb CL |
1575 | task->tk_status = 0; |
1576 | task->tk_action = call_bind; | |
1577 | return; | |
012da158 CL |
1578 | case -ECONNREFUSED: /* connection problems */ |
1579 | case -ECONNRESET: | |
1580 | case -ENOTCONN: | |
1581 | case -EHOSTDOWN: | |
1582 | case -EHOSTUNREACH: | |
1583 | case -ENETUNREACH: | |
1584 | case -EPIPE: | |
1585 | dprintk("RPC: %5u remote rpcbind unreachable: %d\n", | |
1586 | task->tk_pid, task->tk_status); | |
1587 | if (!RPC_IS_SOFTCONN(task)) { | |
1588 | rpc_delay(task, 5*HZ); | |
1589 | goto retry_timeout; | |
1590 | } | |
1591 | status = task->tk_status; | |
1592 | break; | |
da351878 | 1593 | default: |
46121cf7 | 1594 | dprintk("RPC: %5u unrecognized rpcbind error (%d)\n", |
da351878 | 1595 | task->tk_pid, -task->tk_status); |
da351878 CL |
1596 | } |
1597 | ||
1598 | rpc_exit(task, status); | |
1599 | return; | |
1600 | ||
da45828e TM |
1601 | retry_timeout: |
1602 | task->tk_action = call_timeout; | |
da351878 CL |
1603 | } |
1604 | ||
1605 | /* | |
1606 | * 4b. Connect to the RPC server | |
1da177e4 LT |
1607 | */ |
1608 | static void | |
1609 | call_connect(struct rpc_task *task) | |
1610 | { | |
da351878 | 1611 | struct rpc_xprt *xprt = task->tk_xprt; |
1da177e4 | 1612 | |
46121cf7 | 1613 | dprintk("RPC: %5u call_connect xprt %p %s connected\n", |
da351878 CL |
1614 | task->tk_pid, xprt, |
1615 | (xprt_connected(xprt) ? "is" : "is not")); | |
1da177e4 | 1616 | |
da351878 CL |
1617 | task->tk_action = call_transmit; |
1618 | if (!xprt_connected(xprt)) { | |
1619 | task->tk_action = call_connect_status; | |
1620 | if (task->tk_status < 0) | |
1621 | return; | |
1622 | xprt_connect(task); | |
1da177e4 | 1623 | } |
1da177e4 LT |
1624 | } |
1625 | ||
1626 | /* | |
da351878 | 1627 | * 4c. Sort out connect result |
1da177e4 LT |
1628 | */ |
1629 | static void | |
1630 | call_connect_status(struct rpc_task *task) | |
1631 | { | |
1632 | struct rpc_clnt *clnt = task->tk_client; | |
1633 | int status = task->tk_status; | |
1634 | ||
46121cf7 | 1635 | dprint_status(task); |
da351878 | 1636 | |
1da177e4 | 1637 | task->tk_status = 0; |
2a491991 | 1638 | if (status >= 0 || status == -EAGAIN) { |
1da177e4 LT |
1639 | clnt->cl_stats->netreconn++; |
1640 | task->tk_action = call_transmit; | |
1641 | return; | |
1642 | } | |
1643 | ||
5753cba1 | 1644 | trace_rpc_connect_status(task, status); |
1da177e4 | 1645 | switch (status) { |
da45828e TM |
1646 | /* if soft mounted, test if we've timed out */ |
1647 | case -ETIMEDOUT: | |
1648 | task->tk_action = call_timeout; | |
2a491991 TM |
1649 | break; |
1650 | default: | |
1651 | rpc_exit(task, -EIO); | |
1da177e4 LT |
1652 | } |
1653 | } | |
1654 | ||
1655 | /* | |
1656 | * 5. Transmit the RPC request, and wait for reply | |
1657 | */ | |
1658 | static void | |
1659 | call_transmit(struct rpc_task *task) | |
1660 | { | |
46121cf7 | 1661 | dprint_status(task); |
1da177e4 LT |
1662 | |
1663 | task->tk_action = call_status; | |
1664 | if (task->tk_status < 0) | |
1665 | return; | |
1666 | task->tk_status = xprt_prepare_transmit(task); | |
1667 | if (task->tk_status != 0) | |
1668 | return; | |
e0ab53de | 1669 | task->tk_action = call_transmit_status; |
1da177e4 | 1670 | /* Encode here so that rpcsec_gss can use correct sequence number. */ |
940e3318 | 1671 | if (rpc_task_need_encode(task)) { |
b0e1c57e | 1672 | rpc_xdr_encode(task); |
5e5ce5be | 1673 | /* Did the encode result in an error condition? */ |
8b39f2b4 TM |
1674 | if (task->tk_status != 0) { |
1675 | /* Was the error nonfatal? */ | |
1676 | if (task->tk_status == -EAGAIN) | |
1677 | rpc_delay(task, HZ >> 4); | |
1678 | else | |
1679 | rpc_exit(task, task->tk_status); | |
e0ab53de | 1680 | return; |
8b39f2b4 | 1681 | } |
5e5ce5be | 1682 | } |
1da177e4 LT |
1683 | xprt_transmit(task); |
1684 | if (task->tk_status < 0) | |
1685 | return; | |
e0ab53de TM |
1686 | /* |
1687 | * On success, ensure that we call xprt_end_transmit() before sleeping | |
1688 | * in order to allow access to the socket to other RPC requests. | |
1689 | */ | |
1690 | call_transmit_status(task); | |
55ae1aab | 1691 | if (rpc_reply_expected(task)) |
e0ab53de TM |
1692 | return; |
1693 | task->tk_action = rpc_exit_task; | |
fda13939 | 1694 | rpc_wake_up_queued_task(&task->tk_xprt->pending, task); |
e0ab53de TM |
1695 | } |
1696 | ||
1697 | /* | |
1698 | * 5a. Handle cleanup after a transmission | |
1699 | */ | |
1700 | static void | |
1701 | call_transmit_status(struct rpc_task *task) | |
1702 | { | |
1703 | task->tk_action = call_status; | |
206a134b CL |
1704 | |
1705 | /* | |
1706 | * Common case: success. Force the compiler to put this | |
1707 | * test first. | |
1708 | */ | |
1709 | if (task->tk_status == 0) { | |
1710 | xprt_end_transmit(task); | |
1711 | rpc_task_force_reencode(task); | |
1712 | return; | |
1713 | } | |
1714 | ||
15f081ca TM |
1715 | switch (task->tk_status) { |
1716 | case -EAGAIN: | |
1717 | break; | |
1718 | default: | |
206a134b | 1719 | dprint_status(task); |
15f081ca | 1720 | xprt_end_transmit(task); |
09a21c41 CL |
1721 | rpc_task_force_reencode(task); |
1722 | break; | |
15f081ca TM |
1723 | /* |
1724 | * Special cases: if we've been waiting on the | |
1725 | * socket's write_space() callback, or if the | |
1726 | * socket just returned a connection error, | |
1727 | * then hold onto the transport lock. | |
1728 | */ | |
1729 | case -ECONNREFUSED: | |
15f081ca TM |
1730 | case -EHOSTDOWN: |
1731 | case -EHOSTUNREACH: | |
1732 | case -ENETUNREACH: | |
09a21c41 CL |
1733 | if (RPC_IS_SOFTCONN(task)) { |
1734 | xprt_end_transmit(task); | |
1735 | rpc_exit(task, task->tk_status); | |
1736 | break; | |
1737 | } | |
1738 | case -ECONNRESET: | |
1739 | case -ENOTCONN: | |
c8485e4d | 1740 | case -EPIPE: |
15f081ca TM |
1741 | rpc_task_force_reencode(task); |
1742 | } | |
1da177e4 LT |
1743 | } |
1744 | ||
9e00abc3 | 1745 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
55ae1aab RL |
1746 | /* |
1747 | * 5b. Send the backchannel RPC reply. On error, drop the reply. In | |
1748 | * addition, disconnect on connectivity errors. | |
1749 | */ | |
1750 | static void | |
1751 | call_bc_transmit(struct rpc_task *task) | |
1752 | { | |
1753 | struct rpc_rqst *req = task->tk_rqstp; | |
1754 | ||
55ae1aab RL |
1755 | task->tk_status = xprt_prepare_transmit(task); |
1756 | if (task->tk_status == -EAGAIN) { | |
1757 | /* | |
1758 | * Could not reserve the transport. Try again after the | |
1759 | * transport is released. | |
1760 | */ | |
1761 | task->tk_status = 0; | |
1762 | task->tk_action = call_bc_transmit; | |
1763 | return; | |
1764 | } | |
1765 | ||
1766 | task->tk_action = rpc_exit_task; | |
1767 | if (task->tk_status < 0) { | |
1768 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " | |
1769 | "error: %d\n", task->tk_status); | |
1770 | return; | |
1771 | } | |
1772 | ||
1773 | xprt_transmit(task); | |
1774 | xprt_end_transmit(task); | |
1775 | dprint_status(task); | |
1776 | switch (task->tk_status) { | |
1777 | case 0: | |
1778 | /* Success */ | |
1779 | break; | |
1780 | case -EHOSTDOWN: | |
1781 | case -EHOSTUNREACH: | |
1782 | case -ENETUNREACH: | |
1783 | case -ETIMEDOUT: | |
1784 | /* | |
1785 | * Problem reaching the server. Disconnect and let the | |
1786 | * forechannel reestablish the connection. The server will | |
1787 | * have to retransmit the backchannel request and we'll | |
1788 | * reprocess it. Since these ops are idempotent, there's no | |
1789 | * need to cache our reply at this time. | |
1790 | */ | |
1791 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " | |
1792 | "error: %d\n", task->tk_status); | |
1793 | xprt_conditional_disconnect(task->tk_xprt, | |
1794 | req->rq_connect_cookie); | |
1795 | break; | |
1796 | default: | |
1797 | /* | |
1798 | * We were unable to reply and will have to drop the | |
1799 | * request. The server should reconnect and retransmit. | |
1800 | */ | |
1facf4c4 | 1801 | WARN_ON_ONCE(task->tk_status == -EAGAIN); |
55ae1aab RL |
1802 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " |
1803 | "error: %d\n", task->tk_status); | |
1804 | break; | |
1805 | } | |
1806 | rpc_wake_up_queued_task(&req->rq_xprt->pending, task); | |
1807 | } | |
9e00abc3 | 1808 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
55ae1aab | 1809 | |
1da177e4 LT |
1810 | /* |
1811 | * 6. Sort out the RPC call status | |
1812 | */ | |
1813 | static void | |
1814 | call_status(struct rpc_task *task) | |
1815 | { | |
1816 | struct rpc_clnt *clnt = task->tk_client; | |
1817 | struct rpc_rqst *req = task->tk_rqstp; | |
1818 | int status; | |
1819 | ||
dd2b63d0 RL |
1820 | if (req->rq_reply_bytes_recvd > 0 && !req->rq_bytes_sent) |
1821 | task->tk_status = req->rq_reply_bytes_recvd; | |
1da177e4 | 1822 | |
46121cf7 | 1823 | dprint_status(task); |
1da177e4 LT |
1824 | |
1825 | status = task->tk_status; | |
1826 | if (status >= 0) { | |
1827 | task->tk_action = call_decode; | |
1828 | return; | |
1829 | } | |
1830 | ||
5753cba1 | 1831 | trace_rpc_call_status(task); |
1da177e4 LT |
1832 | task->tk_status = 0; |
1833 | switch(status) { | |
76303992 TM |
1834 | case -EHOSTDOWN: |
1835 | case -EHOSTUNREACH: | |
1836 | case -ENETUNREACH: | |
1837 | /* | |
1838 | * Delay any retries for 3 seconds, then handle as if it | |
1839 | * were a timeout. | |
1840 | */ | |
1841 | rpc_delay(task, 3*HZ); | |
1da177e4 LT |
1842 | case -ETIMEDOUT: |
1843 | task->tk_action = call_timeout; | |
241c39b9 | 1844 | if (task->tk_client->cl_discrtry) |
7c1d71cf TM |
1845 | xprt_conditional_disconnect(task->tk_xprt, |
1846 | req->rq_connect_cookie); | |
1da177e4 | 1847 | break; |
c8485e4d | 1848 | case -ECONNRESET: |
1da177e4 | 1849 | case -ECONNREFUSED: |
35f5a422 | 1850 | rpc_force_rebind(clnt); |
c8485e4d TM |
1851 | rpc_delay(task, 3*HZ); |
1852 | case -EPIPE: | |
1853 | case -ENOTCONN: | |
1da177e4 LT |
1854 | task->tk_action = call_bind; |
1855 | break; | |
1856 | case -EAGAIN: | |
1857 | task->tk_action = call_transmit; | |
1858 | break; | |
1859 | case -EIO: | |
1860 | /* shutdown or soft timeout */ | |
1861 | rpc_exit(task, status); | |
1862 | break; | |
1863 | default: | |
b6b6152c OK |
1864 | if (clnt->cl_chatty) |
1865 | printk("%s: RPC call returned error %d\n", | |
1da177e4 LT |
1866 | clnt->cl_protname, -status); |
1867 | rpc_exit(task, status); | |
1da177e4 LT |
1868 | } |
1869 | } | |
1870 | ||
1871 | /* | |
e0ab53de | 1872 | * 6a. Handle RPC timeout |
1da177e4 LT |
1873 | * We do not release the request slot, so we keep using the |
1874 | * same XID for all retransmits. | |
1875 | */ | |
1876 | static void | |
1877 | call_timeout(struct rpc_task *task) | |
1878 | { | |
1879 | struct rpc_clnt *clnt = task->tk_client; | |
1880 | ||
1881 | if (xprt_adjust_timeout(task->tk_rqstp) == 0) { | |
46121cf7 | 1882 | dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid); |
1da177e4 LT |
1883 | goto retry; |
1884 | } | |
1885 | ||
46121cf7 | 1886 | dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid); |
ef759a2e CL |
1887 | task->tk_timeouts++; |
1888 | ||
3a28becc CL |
1889 | if (RPC_IS_SOFTCONN(task)) { |
1890 | rpc_exit(task, -ETIMEDOUT); | |
1891 | return; | |
1892 | } | |
1da177e4 | 1893 | if (RPC_IS_SOFT(task)) { |
cac5d07e | 1894 | if (clnt->cl_chatty) { |
4e0038b6 | 1895 | rcu_read_lock(); |
b6b6152c | 1896 | printk(KERN_NOTICE "%s: server %s not responding, timed out\n", |
4e0038b6 TM |
1897 | clnt->cl_protname, |
1898 | rcu_dereference(clnt->cl_xprt)->servername); | |
1899 | rcu_read_unlock(); | |
cac5d07e | 1900 | } |
7494d00c TM |
1901 | if (task->tk_flags & RPC_TASK_TIMEOUT) |
1902 | rpc_exit(task, -ETIMEDOUT); | |
1903 | else | |
1904 | rpc_exit(task, -EIO); | |
1da177e4 LT |
1905 | return; |
1906 | } | |
1907 | ||
f518e35a | 1908 | if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) { |
1da177e4 | 1909 | task->tk_flags |= RPC_CALL_MAJORSEEN; |
4e0038b6 TM |
1910 | if (clnt->cl_chatty) { |
1911 | rcu_read_lock(); | |
b6b6152c | 1912 | printk(KERN_NOTICE "%s: server %s not responding, still trying\n", |
4e0038b6 TM |
1913 | clnt->cl_protname, |
1914 | rcu_dereference(clnt->cl_xprt)->servername); | |
1915 | rcu_read_unlock(); | |
1916 | } | |
1da177e4 | 1917 | } |
35f5a422 | 1918 | rpc_force_rebind(clnt); |
b48633bd TM |
1919 | /* |
1920 | * Did our request time out due to an RPCSEC_GSS out-of-sequence | |
1921 | * event? RFC2203 requires the server to drop all such requests. | |
1922 | */ | |
1923 | rpcauth_invalcred(task); | |
1da177e4 LT |
1924 | |
1925 | retry: | |
1926 | clnt->cl_stats->rpcretrans++; | |
1927 | task->tk_action = call_bind; | |
1928 | task->tk_status = 0; | |
1929 | } | |
1930 | ||
1931 | /* | |
1932 | * 7. Decode the RPC reply | |
1933 | */ | |
1934 | static void | |
1935 | call_decode(struct rpc_task *task) | |
1936 | { | |
1937 | struct rpc_clnt *clnt = task->tk_client; | |
1938 | struct rpc_rqst *req = task->tk_rqstp; | |
bf269551 | 1939 | kxdrdproc_t decode = task->tk_msg.rpc_proc->p_decode; |
d8ed029d | 1940 | __be32 *p; |
1da177e4 | 1941 | |
726fd6ad | 1942 | dprint_status(task); |
1da177e4 | 1943 | |
f518e35a | 1944 | if (task->tk_flags & RPC_CALL_MAJORSEEN) { |
4e0038b6 TM |
1945 | if (clnt->cl_chatty) { |
1946 | rcu_read_lock(); | |
b6b6152c | 1947 | printk(KERN_NOTICE "%s: server %s OK\n", |
4e0038b6 TM |
1948 | clnt->cl_protname, |
1949 | rcu_dereference(clnt->cl_xprt)->servername); | |
1950 | rcu_read_unlock(); | |
1951 | } | |
1da177e4 LT |
1952 | task->tk_flags &= ~RPC_CALL_MAJORSEEN; |
1953 | } | |
1954 | ||
43ac3f29 TM |
1955 | /* |
1956 | * Ensure that we see all writes made by xprt_complete_rqst() | |
dd2b63d0 | 1957 | * before it changed req->rq_reply_bytes_recvd. |
43ac3f29 TM |
1958 | */ |
1959 | smp_rmb(); | |
1da177e4 LT |
1960 | req->rq_rcv_buf.len = req->rq_private_buf.len; |
1961 | ||
1962 | /* Check that the softirq receive buffer is valid */ | |
1963 | WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf, | |
1964 | sizeof(req->rq_rcv_buf)) != 0); | |
1965 | ||
1e799b67 TM |
1966 | if (req->rq_rcv_buf.len < 12) { |
1967 | if (!RPC_IS_SOFT(task)) { | |
1968 | task->tk_action = call_bind; | |
1969 | clnt->cl_stats->rpcretrans++; | |
1970 | goto out_retry; | |
1971 | } | |
1972 | dprintk("RPC: %s: too small RPC reply size (%d bytes)\n", | |
1973 | clnt->cl_protname, task->tk_status); | |
1974 | task->tk_action = call_timeout; | |
1975 | goto out_retry; | |
1976 | } | |
1977 | ||
b0e1c57e | 1978 | p = rpc_verify_header(task); |
abbcf28f TM |
1979 | if (IS_ERR(p)) { |
1980 | if (p == ERR_PTR(-EAGAIN)) | |
1981 | goto out_retry; | |
1982 | return; | |
1da177e4 LT |
1983 | } |
1984 | ||
abbcf28f | 1985 | task->tk_action = rpc_exit_task; |
1da177e4 | 1986 | |
6d5fcb5a | 1987 | if (decode) { |
1da177e4 LT |
1988 | task->tk_status = rpcauth_unwrap_resp(task, decode, req, p, |
1989 | task->tk_msg.rpc_resp); | |
6d5fcb5a | 1990 | } |
46121cf7 CL |
1991 | dprintk("RPC: %5u call_decode result %d\n", task->tk_pid, |
1992 | task->tk_status); | |
1da177e4 LT |
1993 | return; |
1994 | out_retry: | |
1da177e4 | 1995 | task->tk_status = 0; |
b0e1c57e | 1996 | /* Note: rpc_verify_header() may have freed the RPC slot */ |
24b74bf0 | 1997 | if (task->tk_rqstp == req) { |
dd2b63d0 | 1998 | req->rq_reply_bytes_recvd = req->rq_rcv_buf.len = 0; |
24b74bf0 | 1999 | if (task->tk_client->cl_discrtry) |
7c1d71cf TM |
2000 | xprt_conditional_disconnect(task->tk_xprt, |
2001 | req->rq_connect_cookie); | |
24b74bf0 | 2002 | } |
1da177e4 LT |
2003 | } |
2004 | ||
d8ed029d | 2005 | static __be32 * |
b0e1c57e | 2006 | rpc_encode_header(struct rpc_task *task) |
1da177e4 LT |
2007 | { |
2008 | struct rpc_clnt *clnt = task->tk_client; | |
1da177e4 | 2009 | struct rpc_rqst *req = task->tk_rqstp; |
d8ed029d | 2010 | __be32 *p = req->rq_svec[0].iov_base; |
1da177e4 LT |
2011 | |
2012 | /* FIXME: check buffer size? */ | |
808012fb CL |
2013 | |
2014 | p = xprt_skip_transport_header(task->tk_xprt, p); | |
1da177e4 LT |
2015 | *p++ = req->rq_xid; /* XID */ |
2016 | *p++ = htonl(RPC_CALL); /* CALL */ | |
2017 | *p++ = htonl(RPC_VERSION); /* RPC version */ | |
2018 | *p++ = htonl(clnt->cl_prog); /* program number */ | |
2019 | *p++ = htonl(clnt->cl_vers); /* program version */ | |
2020 | *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */ | |
334ccfd5 TM |
2021 | p = rpcauth_marshcred(task, p); |
2022 | req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p); | |
2023 | return p; | |
1da177e4 LT |
2024 | } |
2025 | ||
d8ed029d | 2026 | static __be32 * |
b0e1c57e | 2027 | rpc_verify_header(struct rpc_task *task) |
1da177e4 | 2028 | { |
4e0038b6 | 2029 | struct rpc_clnt *clnt = task->tk_client; |
1da177e4 LT |
2030 | struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0]; |
2031 | int len = task->tk_rqstp->rq_rcv_buf.len >> 2; | |
d8ed029d AD |
2032 | __be32 *p = iov->iov_base; |
2033 | u32 n; | |
1da177e4 LT |
2034 | int error = -EACCES; |
2035 | ||
e8896495 DH |
2036 | if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) { |
2037 | /* RFC-1014 says that the representation of XDR data must be a | |
2038 | * multiple of four bytes | |
2039 | * - if it isn't pointer subtraction in the NFS client may give | |
2040 | * undefined results | |
2041 | */ | |
8a702bbb | 2042 | dprintk("RPC: %5u %s: XDR representation not a multiple of" |
0dc47877 | 2043 | " 4 bytes: 0x%x\n", task->tk_pid, __func__, |
8a702bbb | 2044 | task->tk_rqstp->rq_rcv_buf.len); |
e8896495 DH |
2045 | goto out_eio; |
2046 | } | |
1da177e4 LT |
2047 | if ((len -= 3) < 0) |
2048 | goto out_overflow; | |
1da177e4 | 2049 | |
f4a2e418 | 2050 | p += 1; /* skip XID */ |
1da177e4 | 2051 | if ((n = ntohl(*p++)) != RPC_REPLY) { |
8a702bbb | 2052 | dprintk("RPC: %5u %s: not an RPC reply: %x\n", |
f4a2e418 | 2053 | task->tk_pid, __func__, n); |
abbcf28f | 2054 | goto out_garbage; |
1da177e4 | 2055 | } |
f4a2e418 | 2056 | |
1da177e4 LT |
2057 | if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) { |
2058 | if (--len < 0) | |
2059 | goto out_overflow; | |
2060 | switch ((n = ntohl(*p++))) { | |
89f0e4fe JP |
2061 | case RPC_AUTH_ERROR: |
2062 | break; | |
2063 | case RPC_MISMATCH: | |
2064 | dprintk("RPC: %5u %s: RPC call version mismatch!\n", | |
2065 | task->tk_pid, __func__); | |
2066 | error = -EPROTONOSUPPORT; | |
2067 | goto out_err; | |
2068 | default: | |
2069 | dprintk("RPC: %5u %s: RPC call rejected, " | |
2070 | "unknown error: %x\n", | |
2071 | task->tk_pid, __func__, n); | |
2072 | goto out_eio; | |
1da177e4 LT |
2073 | } |
2074 | if (--len < 0) | |
2075 | goto out_overflow; | |
2076 | switch ((n = ntohl(*p++))) { | |
2077 | case RPC_AUTH_REJECTEDCRED: | |
2078 | case RPC_AUTH_REJECTEDVERF: | |
2079 | case RPCSEC_GSS_CREDPROBLEM: | |
2080 | case RPCSEC_GSS_CTXPROBLEM: | |
2081 | if (!task->tk_cred_retry) | |
2082 | break; | |
2083 | task->tk_cred_retry--; | |
46121cf7 | 2084 | dprintk("RPC: %5u %s: retry stale creds\n", |
0dc47877 | 2085 | task->tk_pid, __func__); |
1da177e4 | 2086 | rpcauth_invalcred(task); |
220bcc2a TM |
2087 | /* Ensure we obtain a new XID! */ |
2088 | xprt_release(task); | |
118df3d1 | 2089 | task->tk_action = call_reserve; |
abbcf28f | 2090 | goto out_retry; |
1da177e4 LT |
2091 | case RPC_AUTH_BADCRED: |
2092 | case RPC_AUTH_BADVERF: | |
2093 | /* possibly garbled cred/verf? */ | |
2094 | if (!task->tk_garb_retry) | |
2095 | break; | |
2096 | task->tk_garb_retry--; | |
46121cf7 | 2097 | dprintk("RPC: %5u %s: retry garbled creds\n", |
0dc47877 | 2098 | task->tk_pid, __func__); |
1da177e4 | 2099 | task->tk_action = call_bind; |
abbcf28f | 2100 | goto out_retry; |
1da177e4 | 2101 | case RPC_AUTH_TOOWEAK: |
4e0038b6 | 2102 | rcu_read_lock(); |
b0e1c57e | 2103 | printk(KERN_NOTICE "RPC: server %s requires stronger " |
4e0038b6 TM |
2104 | "authentication.\n", |
2105 | rcu_dereference(clnt->cl_xprt)->servername); | |
2106 | rcu_read_unlock(); | |
1da177e4 LT |
2107 | break; |
2108 | default: | |
8a702bbb | 2109 | dprintk("RPC: %5u %s: unknown auth error: %x\n", |
0dc47877 | 2110 | task->tk_pid, __func__, n); |
1da177e4 LT |
2111 | error = -EIO; |
2112 | } | |
46121cf7 | 2113 | dprintk("RPC: %5u %s: call rejected %d\n", |
0dc47877 | 2114 | task->tk_pid, __func__, n); |
1da177e4 LT |
2115 | goto out_err; |
2116 | } | |
2117 | if (!(p = rpcauth_checkverf(task, p))) { | |
8a702bbb | 2118 | dprintk("RPC: %5u %s: auth check failed\n", |
0dc47877 | 2119 | task->tk_pid, __func__); |
abbcf28f | 2120 | goto out_garbage; /* bad verifier, retry */ |
1da177e4 | 2121 | } |
d8ed029d | 2122 | len = p - (__be32 *)iov->iov_base - 1; |
1da177e4 LT |
2123 | if (len < 0) |
2124 | goto out_overflow; | |
2125 | switch ((n = ntohl(*p++))) { | |
2126 | case RPC_SUCCESS: | |
2127 | return p; | |
2128 | case RPC_PROG_UNAVAIL: | |
4e0038b6 TM |
2129 | dprintk_rcu("RPC: %5u %s: program %u is unsupported " |
2130 | "by server %s\n", task->tk_pid, __func__, | |
2131 | (unsigned int)clnt->cl_prog, | |
2132 | rcu_dereference(clnt->cl_xprt)->servername); | |
cdf47706 AG |
2133 | error = -EPFNOSUPPORT; |
2134 | goto out_err; | |
1da177e4 | 2135 | case RPC_PROG_MISMATCH: |
4e0038b6 TM |
2136 | dprintk_rcu("RPC: %5u %s: program %u, version %u unsupported " |
2137 | "by server %s\n", task->tk_pid, __func__, | |
2138 | (unsigned int)clnt->cl_prog, | |
2139 | (unsigned int)clnt->cl_vers, | |
2140 | rcu_dereference(clnt->cl_xprt)->servername); | |
cdf47706 AG |
2141 | error = -EPROTONOSUPPORT; |
2142 | goto out_err; | |
1da177e4 | 2143 | case RPC_PROC_UNAVAIL: |
4e0038b6 | 2144 | dprintk_rcu("RPC: %5u %s: proc %s unsupported by program %u, " |
46121cf7 | 2145 | "version %u on server %s\n", |
0dc47877 | 2146 | task->tk_pid, __func__, |
3748f1e4 | 2147 | rpc_proc_name(task), |
4e0038b6 TM |
2148 | clnt->cl_prog, clnt->cl_vers, |
2149 | rcu_dereference(clnt->cl_xprt)->servername); | |
cdf47706 AG |
2150 | error = -EOPNOTSUPP; |
2151 | goto out_err; | |
1da177e4 | 2152 | case RPC_GARBAGE_ARGS: |
46121cf7 | 2153 | dprintk("RPC: %5u %s: server saw garbage\n", |
0dc47877 | 2154 | task->tk_pid, __func__); |
1da177e4 LT |
2155 | break; /* retry */ |
2156 | default: | |
8a702bbb | 2157 | dprintk("RPC: %5u %s: server accept status: %x\n", |
0dc47877 | 2158 | task->tk_pid, __func__, n); |
1da177e4 LT |
2159 | /* Also retry */ |
2160 | } | |
2161 | ||
abbcf28f | 2162 | out_garbage: |
4e0038b6 | 2163 | clnt->cl_stats->rpcgarbage++; |
1da177e4 LT |
2164 | if (task->tk_garb_retry) { |
2165 | task->tk_garb_retry--; | |
46121cf7 | 2166 | dprintk("RPC: %5u %s: retrying\n", |
0dc47877 | 2167 | task->tk_pid, __func__); |
1da177e4 | 2168 | task->tk_action = call_bind; |
abbcf28f TM |
2169 | out_retry: |
2170 | return ERR_PTR(-EAGAIN); | |
1da177e4 | 2171 | } |
1da177e4 LT |
2172 | out_eio: |
2173 | error = -EIO; | |
2174 | out_err: | |
2175 | rpc_exit(task, error); | |
8a702bbb | 2176 | dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid, |
0dc47877 | 2177 | __func__, error); |
abbcf28f | 2178 | return ERR_PTR(error); |
1da177e4 | 2179 | out_overflow: |
8a702bbb | 2180 | dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid, |
0dc47877 | 2181 | __func__); |
abbcf28f | 2182 | goto out_garbage; |
1da177e4 | 2183 | } |
5ee0ed7d | 2184 | |
9f06c719 | 2185 | static void rpcproc_encode_null(void *rqstp, struct xdr_stream *xdr, void *obj) |
5ee0ed7d | 2186 | { |
5ee0ed7d TM |
2187 | } |
2188 | ||
bf269551 | 2189 | static int rpcproc_decode_null(void *rqstp, struct xdr_stream *xdr, void *obj) |
5ee0ed7d TM |
2190 | { |
2191 | return 0; | |
2192 | } | |
2193 | ||
2194 | static struct rpc_procinfo rpcproc_null = { | |
2195 | .p_encode = rpcproc_encode_null, | |
2196 | .p_decode = rpcproc_decode_null, | |
2197 | }; | |
2198 | ||
caabea8a | 2199 | static int rpc_ping(struct rpc_clnt *clnt) |
5ee0ed7d TM |
2200 | { |
2201 | struct rpc_message msg = { | |
2202 | .rpc_proc = &rpcproc_null, | |
2203 | }; | |
2204 | int err; | |
2205 | msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0); | |
caabea8a | 2206 | err = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN); |
5ee0ed7d TM |
2207 | put_rpccred(msg.rpc_cred); |
2208 | return err; | |
2209 | } | |
188fef11 | 2210 | |
5e1550d6 TM |
2211 | struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags) |
2212 | { | |
2213 | struct rpc_message msg = { | |
2214 | .rpc_proc = &rpcproc_null, | |
2215 | .rpc_cred = cred, | |
2216 | }; | |
84115e1c TM |
2217 | struct rpc_task_setup task_setup_data = { |
2218 | .rpc_client = clnt, | |
2219 | .rpc_message = &msg, | |
2220 | .callback_ops = &rpc_default_ops, | |
2221 | .flags = flags, | |
2222 | }; | |
c970aa85 | 2223 | return rpc_run_task(&task_setup_data); |
5e1550d6 | 2224 | } |
e8914c65 | 2225 | EXPORT_SYMBOL_GPL(rpc_call_null); |
5e1550d6 | 2226 | |
188fef11 | 2227 | #ifdef RPC_DEBUG |
68a23ee9 CL |
2228 | static void rpc_show_header(void) |
2229 | { | |
cb3997b5 CL |
2230 | printk(KERN_INFO "-pid- flgs status -client- --rqstp- " |
2231 | "-timeout ---ops--\n"); | |
68a23ee9 CL |
2232 | } |
2233 | ||
38e886e0 CL |
2234 | static void rpc_show_task(const struct rpc_clnt *clnt, |
2235 | const struct rpc_task *task) | |
2236 | { | |
2237 | const char *rpc_waitq = "none"; | |
38e886e0 CL |
2238 | |
2239 | if (RPC_IS_QUEUED(task)) | |
2240 | rpc_waitq = rpc_qname(task->tk_waitqueue); | |
2241 | ||
b3bcedad | 2242 | printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%ps q:%s\n", |
cb3997b5 CL |
2243 | task->tk_pid, task->tk_flags, task->tk_status, |
2244 | clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops, | |
2245 | clnt->cl_protname, clnt->cl_vers, rpc_proc_name(task), | |
b3bcedad | 2246 | task->tk_action, rpc_waitq); |
38e886e0 CL |
2247 | } |
2248 | ||
70abc49b | 2249 | void rpc_show_tasks(struct net *net) |
188fef11 TM |
2250 | { |
2251 | struct rpc_clnt *clnt; | |
38e886e0 | 2252 | struct rpc_task *task; |
68a23ee9 | 2253 | int header = 0; |
70abc49b | 2254 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
188fef11 | 2255 | |
70abc49b SK |
2256 | spin_lock(&sn->rpc_client_lock); |
2257 | list_for_each_entry(clnt, &sn->all_clients, cl_clients) { | |
188fef11 | 2258 | spin_lock(&clnt->cl_lock); |
38e886e0 | 2259 | list_for_each_entry(task, &clnt->cl_tasks, tk_task) { |
68a23ee9 CL |
2260 | if (!header) { |
2261 | rpc_show_header(); | |
2262 | header++; | |
2263 | } | |
38e886e0 | 2264 | rpc_show_task(clnt, task); |
188fef11 TM |
2265 | } |
2266 | spin_unlock(&clnt->cl_lock); | |
2267 | } | |
70abc49b | 2268 | spin_unlock(&sn->rpc_client_lock); |
188fef11 TM |
2269 | } |
2270 | #endif |