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