Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
55aa4f58 | 2 | * linux/net/sunrpc/clnt.c |
1da177e4 LT |
3 | * |
4 | * This file contains the high-level RPC interface. | |
5 | * It is modeled as a finite state machine to support both synchronous | |
6 | * and asynchronous requests. | |
7 | * | |
8 | * - RPC header generation and argument serialization. | |
9 | * - Credential refresh. | |
10 | * - TCP connect handling. | |
11 | * - Retry of operation when it is suspected the operation failed because | |
12 | * of uid squashing on the server, or when the credentials were stale | |
13 | * and need to be refreshed, or when a packet was damaged in transit. | |
14 | * This may be have to be moved to the VFS layer. | |
15 | * | |
1da177e4 LT |
16 | * Copyright (C) 1992,1993 Rick Sladkey <jrs@world.std.com> |
17 | * Copyright (C) 1995,1996 Olaf Kirch <okir@monad.swb.de> | |
18 | */ | |
19 | ||
1da177e4 LT |
20 | |
21 | #include <linux/module.h> | |
22 | #include <linux/types.h> | |
cb3997b5 | 23 | #include <linux/kallsyms.h> |
1da177e4 | 24 | #include <linux/mm.h> |
23ac6581 TM |
25 | #include <linux/namei.h> |
26 | #include <linux/mount.h> | |
1da177e4 | 27 | #include <linux/slab.h> |
1da177e4 | 28 | #include <linux/utsname.h> |
11c556b3 | 29 | #include <linux/workqueue.h> |
176e21ee | 30 | #include <linux/in.h> |
510deb0d | 31 | #include <linux/in6.h> |
176e21ee | 32 | #include <linux/un.h> |
2446ab60 | 33 | #include <linux/rcupdate.h> |
1da177e4 LT |
34 | |
35 | #include <linux/sunrpc/clnt.h> | |
1da177e4 | 36 | #include <linux/sunrpc/rpc_pipe_fs.h> |
11c556b3 | 37 | #include <linux/sunrpc/metrics.h> |
55ae1aab | 38 | #include <linux/sunrpc/bc_xprt.h> |
5753cba1 | 39 | #include <trace/events/sunrpc.h> |
1da177e4 | 40 | |
55ae1aab | 41 | #include "sunrpc.h" |
70abc49b | 42 | #include "netns.h" |
1da177e4 | 43 | |
1da177e4 LT |
44 | #ifdef RPC_DEBUG |
45 | # define RPCDBG_FACILITY RPCDBG_CALL | |
46 | #endif | |
47 | ||
46121cf7 CL |
48 | #define dprint_status(t) \ |
49 | dprintk("RPC: %5u %s (status %d)\n", t->tk_pid, \ | |
0dc47877 | 50 | __func__, t->tk_status) |
46121cf7 | 51 | |
188fef11 TM |
52 | /* |
53 | * All RPC clients are linked into this list | |
54 | */ | |
188fef11 | 55 | |
1da177e4 LT |
56 | static DECLARE_WAIT_QUEUE_HEAD(destroy_wait); |
57 | ||
58 | ||
59 | static void call_start(struct rpc_task *task); | |
60 | static void call_reserve(struct rpc_task *task); | |
61 | static void call_reserveresult(struct rpc_task *task); | |
62 | static void call_allocate(struct rpc_task *task); | |
1da177e4 LT |
63 | static void call_decode(struct rpc_task *task); |
64 | static void call_bind(struct rpc_task *task); | |
da351878 | 65 | static void call_bind_status(struct rpc_task *task); |
1da177e4 | 66 | static void call_transmit(struct rpc_task *task); |
9e00abc3 | 67 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
55ae1aab | 68 | static void call_bc_transmit(struct rpc_task *task); |
9e00abc3 | 69 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
1da177e4 | 70 | static void call_status(struct rpc_task *task); |
940e3318 | 71 | static void call_transmit_status(struct rpc_task *task); |
1da177e4 LT |
72 | static void call_refresh(struct rpc_task *task); |
73 | static void call_refreshresult(struct rpc_task *task); | |
74 | static void call_timeout(struct rpc_task *task); | |
75 | static void call_connect(struct rpc_task *task); | |
76 | static void call_connect_status(struct rpc_task *task); | |
1da177e4 | 77 | |
b0e1c57e CL |
78 | static __be32 *rpc_encode_header(struct rpc_task *task); |
79 | static __be32 *rpc_verify_header(struct rpc_task *task); | |
caabea8a | 80 | static int rpc_ping(struct rpc_clnt *clnt); |
64c91a1f | 81 | |
188fef11 TM |
82 | static void rpc_register_client(struct rpc_clnt *clnt) |
83 | { | |
2446ab60 TM |
84 | struct net *net = rpc_net_ns(clnt); |
85 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
70abc49b SK |
86 | |
87 | spin_lock(&sn->rpc_client_lock); | |
88 | list_add(&clnt->cl_clients, &sn->all_clients); | |
89 | spin_unlock(&sn->rpc_client_lock); | |
188fef11 TM |
90 | } |
91 | ||
92 | static void rpc_unregister_client(struct rpc_clnt *clnt) | |
93 | { | |
2446ab60 TM |
94 | struct net *net = rpc_net_ns(clnt); |
95 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
70abc49b SK |
96 | |
97 | spin_lock(&sn->rpc_client_lock); | |
188fef11 | 98 | list_del(&clnt->cl_clients); |
70abc49b | 99 | spin_unlock(&sn->rpc_client_lock); |
188fef11 | 100 | } |
1da177e4 | 101 | |
0157d021 SK |
102 | static void __rpc_clnt_remove_pipedir(struct rpc_clnt *clnt) |
103 | { | |
30507f58 | 104 | if (clnt->cl_dentry) { |
80df9d20 SK |
105 | if (clnt->cl_auth && clnt->cl_auth->au_ops->pipes_destroy) |
106 | clnt->cl_auth->au_ops->pipes_destroy(clnt->cl_auth); | |
30507f58 | 107 | rpc_remove_client_dir(clnt->cl_dentry); |
80df9d20 | 108 | } |
30507f58 | 109 | clnt->cl_dentry = NULL; |
0157d021 SK |
110 | } |
111 | ||
112 | static void rpc_clnt_remove_pipedir(struct rpc_clnt *clnt) | |
113 | { | |
2446ab60 | 114 | struct net *net = rpc_net_ns(clnt); |
0157d021 | 115 | struct super_block *pipefs_sb; |
0157d021 | 116 | |
2446ab60 | 117 | pipefs_sb = rpc_get_sb_net(net); |
0157d021 | 118 | if (pipefs_sb) { |
0157d021 | 119 | __rpc_clnt_remove_pipedir(clnt); |
2446ab60 | 120 | rpc_put_sb_net(net); |
0157d021 | 121 | } |
0157d021 SK |
122 | } |
123 | ||
124 | static struct dentry *rpc_setup_pipedir_sb(struct super_block *sb, | |
080b794c TM |
125 | struct rpc_clnt *clnt, |
126 | const char *dir_name) | |
1da177e4 | 127 | { |
f134585a | 128 | static uint32_t clntid; |
23ac6581 | 129 | char name[15]; |
26fe5750 | 130 | struct qstr q = { .name = name }; |
0157d021 | 131 | struct dentry *dir, *dentry; |
1da177e4 LT |
132 | int error; |
133 | ||
0157d021 | 134 | dir = rpc_d_lookup_sb(sb, dir_name); |
922eeac3 WAA |
135 | if (dir == NULL) { |
136 | pr_info("RPC: pipefs directory doesn't exist: %s\n", dir_name); | |
0157d021 | 137 | return dir; |
922eeac3 | 138 | } |
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); | |
922eeac3 WAA |
197 | if (!dentry) |
198 | return -ENOENT; | |
80df9d20 SK |
199 | if (IS_ERR(dentry)) |
200 | return PTR_ERR(dentry); | |
30507f58 | 201 | clnt->cl_dentry = dentry; |
80df9d20 SK |
202 | if (clnt->cl_auth->au_ops->pipes_create) { |
203 | err = clnt->cl_auth->au_ops->pipes_create(clnt->cl_auth); | |
204 | if (err) | |
205 | __rpc_clnt_remove_pipedir(clnt); | |
206 | } | |
207 | break; | |
208 | case RPC_PIPEFS_UMOUNT: | |
209 | __rpc_clnt_remove_pipedir(clnt); | |
210 | break; | |
211 | default: | |
212 | printk(KERN_ERR "%s: unknown event: %ld\n", __func__, event); | |
213 | return -ENOTSUPP; | |
214 | } | |
215 | return err; | |
216 | } | |
217 | ||
ea8cfa06 SK |
218 | static int __rpc_pipefs_event(struct rpc_clnt *clnt, unsigned long event, |
219 | struct super_block *sb) | |
220 | { | |
221 | int error = 0; | |
222 | ||
223 | for (;; clnt = clnt->cl_parent) { | |
224 | if (!rpc_clnt_skip_event(clnt, event)) | |
225 | error = __rpc_clnt_handle_event(clnt, event, sb); | |
226 | if (error || clnt == clnt->cl_parent) | |
227 | break; | |
228 | } | |
229 | return error; | |
230 | } | |
231 | ||
da3b4622 SK |
232 | static struct rpc_clnt *rpc_get_client_for_event(struct net *net, int event) |
233 | { | |
234 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
235 | struct rpc_clnt *clnt; | |
236 | ||
237 | spin_lock(&sn->rpc_client_lock); | |
238 | list_for_each_entry(clnt, &sn->all_clients, cl_clients) { | |
7aab449e | 239 | if (clnt->cl_program->pipe_dir_name == NULL) |
cd6c5968 | 240 | continue; |
ea8cfa06 | 241 | if (rpc_clnt_skip_event(clnt, event)) |
da3b4622 | 242 | continue; |
a4dff1bc SK |
243 | if (atomic_inc_not_zero(&clnt->cl_count) == 0) |
244 | continue; | |
da3b4622 SK |
245 | spin_unlock(&sn->rpc_client_lock); |
246 | return clnt; | |
247 | } | |
248 | spin_unlock(&sn->rpc_client_lock); | |
249 | return NULL; | |
250 | } | |
251 | ||
80df9d20 SK |
252 | static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event, |
253 | void *ptr) | |
254 | { | |
255 | struct super_block *sb = ptr; | |
256 | struct rpc_clnt *clnt; | |
257 | int error = 0; | |
80df9d20 | 258 | |
da3b4622 | 259 | while ((clnt = rpc_get_client_for_event(sb->s_fs_info, event))) { |
80df9d20 | 260 | error = __rpc_pipefs_event(clnt, event, sb); |
da3b4622 | 261 | rpc_release_client(clnt); |
80df9d20 SK |
262 | if (error) |
263 | break; | |
264 | } | |
80df9d20 SK |
265 | return error; |
266 | } | |
267 | ||
268 | static struct notifier_block rpc_clients_block = { | |
269 | .notifier_call = rpc_pipefs_event, | |
eee17325 | 270 | .priority = SUNRPC_PIPEFS_RPC_PRIO, |
80df9d20 SK |
271 | }; |
272 | ||
273 | int rpc_clients_notifier_register(void) | |
274 | { | |
275 | return rpc_pipefs_notifier_register(&rpc_clients_block); | |
276 | } | |
277 | ||
278 | void rpc_clients_notifier_unregister(void) | |
279 | { | |
280 | return rpc_pipefs_notifier_unregister(&rpc_clients_block); | |
281 | } | |
282 | ||
cbbb3449 TM |
283 | static void rpc_clnt_set_nodename(struct rpc_clnt *clnt, const char *nodename) |
284 | { | |
285 | clnt->cl_nodelen = strlen(nodename); | |
286 | if (clnt->cl_nodelen > UNX_MAXNODENAME) | |
287 | clnt->cl_nodelen = UNX_MAXNODENAME; | |
288 | memcpy(clnt->cl_nodename, nodename, clnt->cl_nodelen); | |
289 | } | |
290 | ||
698b6d08 | 291 | static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, struct rpc_xprt *xprt) |
1da177e4 | 292 | { |
a613fa16 TM |
293 | const struct rpc_program *program = args->program; |
294 | const struct rpc_version *version; | |
1da177e4 | 295 | struct rpc_clnt *clnt = NULL; |
6a19275a | 296 | struct rpc_auth *auth; |
1da177e4 | 297 | int err; |
06b8d255 CL |
298 | |
299 | /* sanity check the name before trying to print it */ | |
46121cf7 | 300 | dprintk("RPC: creating %s client for %s (xprt %p)\n", |
698b6d08 | 301 | program->name, args->servername, xprt); |
1da177e4 | 302 | |
4ada539e TM |
303 | err = rpciod_up(); |
304 | if (err) | |
305 | goto out_no_rpciod; | |
1da177e4 LT |
306 | err = -EINVAL; |
307 | if (!xprt) | |
712917d1 | 308 | goto out_no_xprt; |
698b6d08 TM |
309 | |
310 | if (args->version >= program->nrvers) | |
311 | goto out_err; | |
312 | version = program->version[args->version]; | |
313 | if (version == NULL) | |
1da177e4 LT |
314 | goto out_err; |
315 | ||
316 | err = -ENOMEM; | |
0da974f4 | 317 | clnt = kzalloc(sizeof(*clnt), GFP_KERNEL); |
1da177e4 LT |
318 | if (!clnt) |
319 | goto out_err; | |
1da177e4 LT |
320 | clnt->cl_parent = clnt; |
321 | ||
2446ab60 | 322 | rcu_assign_pointer(clnt->cl_xprt, xprt); |
1da177e4 LT |
323 | clnt->cl_procinfo = version->procs; |
324 | clnt->cl_maxproc = version->nrprocs; | |
325 | clnt->cl_protname = program->name; | |
d5b337b4 | 326 | clnt->cl_prog = args->prognumber ? : program->number; |
1da177e4 | 327 | clnt->cl_vers = version->number; |
1da177e4 | 328 | clnt->cl_stats = program->stats; |
11c556b3 | 329 | clnt->cl_metrics = rpc_alloc_iostats(clnt); |
23bf85ba TM |
330 | err = -ENOMEM; |
331 | if (clnt->cl_metrics == NULL) | |
332 | goto out_no_stats; | |
3e32a5d9 | 333 | clnt->cl_program = program; |
6529eba0 | 334 | INIT_LIST_HEAD(&clnt->cl_tasks); |
4bef61ff | 335 | spin_lock_init(&clnt->cl_lock); |
1da177e4 | 336 | |
2446ab60 | 337 | if (!xprt_bound(xprt)) |
1da177e4 LT |
338 | clnt->cl_autobind = 1; |
339 | ||
ba7392bb TM |
340 | clnt->cl_timeout = xprt->timeout; |
341 | if (args->timeout != NULL) { | |
342 | memcpy(&clnt->cl_timeout_default, args->timeout, | |
343 | sizeof(clnt->cl_timeout_default)); | |
344 | clnt->cl_timeout = &clnt->cl_timeout_default; | |
345 | } | |
346 | ||
1da177e4 | 347 | clnt->cl_rtt = &clnt->cl_rtt_default; |
ba7392bb | 348 | rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval); |
608207e8 OK |
349 | clnt->cl_principal = NULL; |
350 | if (args->client_name) { | |
351 | clnt->cl_principal = kstrdup(args->client_name, GFP_KERNEL); | |
352 | if (!clnt->cl_principal) | |
353 | goto out_no_principal; | |
354 | } | |
1da177e4 | 355 | |
006abe88 | 356 | atomic_set(&clnt->cl_count, 1); |
34f52e35 | 357 | |
1da177e4 LT |
358 | err = rpc_setup_pipedir(clnt, program->pipe_dir_name); |
359 | if (err < 0) | |
360 | goto out_no_path; | |
361 | ||
698b6d08 | 362 | auth = rpcauth_create(args->authflavor, clnt); |
6a19275a | 363 | if (IS_ERR(auth)) { |
1da177e4 | 364 | printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n", |
698b6d08 | 365 | args->authflavor); |
6a19275a | 366 | err = PTR_ERR(auth); |
1da177e4 LT |
367 | goto out_no_auth; |
368 | } | |
369 | ||
370 | /* save the nodename */ | |
cbbb3449 | 371 | rpc_clnt_set_nodename(clnt, utsname()->nodename); |
6529eba0 | 372 | rpc_register_client(clnt); |
1da177e4 LT |
373 | return clnt; |
374 | ||
375 | out_no_auth: | |
0157d021 | 376 | rpc_clnt_remove_pipedir(clnt); |
1da177e4 | 377 | out_no_path: |
608207e8 OK |
378 | kfree(clnt->cl_principal); |
379 | out_no_principal: | |
23bf85ba TM |
380 | rpc_free_iostats(clnt->cl_metrics); |
381 | out_no_stats: | |
1da177e4 LT |
382 | kfree(clnt); |
383 | out_err: | |
6b6ca86b | 384 | xprt_put(xprt); |
712917d1 | 385 | out_no_xprt: |
4ada539e TM |
386 | rpciod_down(); |
387 | out_no_rpciod: | |
1da177e4 LT |
388 | return ERR_PTR(err); |
389 | } | |
390 | ||
2c53040f | 391 | /** |
c2866763 CL |
392 | * rpc_create - create an RPC client and transport with one call |
393 | * @args: rpc_clnt create argument structure | |
394 | * | |
395 | * Creates and initializes an RPC transport and an RPC client. | |
396 | * | |
397 | * It can ping the server in order to determine if it is up, and to see if | |
398 | * it supports this program and version. RPC_CLNT_CREATE_NOPING disables | |
399 | * this behavior so asynchronous tasks can also use rpc_create. | |
400 | */ | |
401 | struct rpc_clnt *rpc_create(struct rpc_create_args *args) | |
402 | { | |
403 | struct rpc_xprt *xprt; | |
404 | struct rpc_clnt *clnt; | |
3c341b0b | 405 | struct xprt_create xprtargs = { |
9a23e332 | 406 | .net = args->net, |
4fa016eb | 407 | .ident = args->protocol, |
d3bc9a1d | 408 | .srcaddr = args->saddress, |
96802a09 FM |
409 | .dstaddr = args->address, |
410 | .addrlen = args->addrsize, | |
4e0038b6 | 411 | .servername = args->servername, |
f300baba | 412 | .bc_xprt = args->bc_xprt, |
96802a09 | 413 | }; |
510deb0d | 414 | char servername[48]; |
c2866763 | 415 | |
43780b87 CL |
416 | /* |
417 | * If the caller chooses not to specify a hostname, whip | |
418 | * up a string representation of the passed-in address. | |
419 | */ | |
4e0038b6 | 420 | if (xprtargs.servername == NULL) { |
176e21ee CL |
421 | struct sockaddr_un *sun = |
422 | (struct sockaddr_un *)args->address; | |
da09eb93 CL |
423 | struct sockaddr_in *sin = |
424 | (struct sockaddr_in *)args->address; | |
425 | struct sockaddr_in6 *sin6 = | |
426 | (struct sockaddr_in6 *)args->address; | |
427 | ||
510deb0d CL |
428 | servername[0] = '\0'; |
429 | switch (args->address->sa_family) { | |
176e21ee CL |
430 | case AF_LOCAL: |
431 | snprintf(servername, sizeof(servername), "%s", | |
432 | sun->sun_path); | |
433 | break; | |
da09eb93 | 434 | case AF_INET: |
21454aaa HH |
435 | snprintf(servername, sizeof(servername), "%pI4", |
436 | &sin->sin_addr.s_addr); | |
510deb0d | 437 | break; |
da09eb93 | 438 | case AF_INET6: |
5b095d98 | 439 | snprintf(servername, sizeof(servername), "%pI6", |
da09eb93 | 440 | &sin6->sin6_addr); |
510deb0d | 441 | break; |
510deb0d CL |
442 | default: |
443 | /* caller wants default server name, but | |
444 | * address family isn't recognized. */ | |
445 | return ERR_PTR(-EINVAL); | |
446 | } | |
4e0038b6 | 447 | xprtargs.servername = servername; |
43780b87 CL |
448 | } |
449 | ||
510deb0d CL |
450 | xprt = xprt_create_transport(&xprtargs); |
451 | if (IS_ERR(xprt)) | |
452 | return (struct rpc_clnt *)xprt; | |
453 | ||
c2866763 CL |
454 | /* |
455 | * By default, kernel RPC client connects from a reserved port. | |
456 | * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters, | |
457 | * but it is always enabled for rpciod, which handles the connect | |
458 | * operation. | |
459 | */ | |
460 | xprt->resvport = 1; | |
461 | if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT) | |
462 | xprt->resvport = 0; | |
463 | ||
698b6d08 | 464 | clnt = rpc_new_client(args, xprt); |
c2866763 CL |
465 | if (IS_ERR(clnt)) |
466 | return clnt; | |
467 | ||
468 | if (!(args->flags & RPC_CLNT_CREATE_NOPING)) { | |
caabea8a | 469 | int err = rpc_ping(clnt); |
c2866763 CL |
470 | if (err != 0) { |
471 | rpc_shutdown_client(clnt); | |
472 | return ERR_PTR(err); | |
473 | } | |
474 | } | |
475 | ||
476 | clnt->cl_softrtry = 1; | |
477 | if (args->flags & RPC_CLNT_CREATE_HARDRTRY) | |
478 | clnt->cl_softrtry = 0; | |
479 | ||
c2866763 CL |
480 | if (args->flags & RPC_CLNT_CREATE_AUTOBIND) |
481 | clnt->cl_autobind = 1; | |
43d78ef2 CL |
482 | if (args->flags & RPC_CLNT_CREATE_DISCRTRY) |
483 | clnt->cl_discrtry = 1; | |
b6b6152c OK |
484 | if (!(args->flags & RPC_CLNT_CREATE_QUIET)) |
485 | clnt->cl_chatty = 1; | |
c2866763 CL |
486 | |
487 | return clnt; | |
488 | } | |
b86acd50 | 489 | EXPORT_SYMBOL_GPL(rpc_create); |
c2866763 | 490 | |
1da177e4 LT |
491 | /* |
492 | * This function clones the RPC client structure. It allows us to share the | |
493 | * same transport while varying parameters such as the authentication | |
494 | * flavour. | |
495 | */ | |
1b63a751 CL |
496 | static struct rpc_clnt *__rpc_clone_client(struct rpc_create_args *args, |
497 | struct rpc_clnt *clnt) | |
1da177e4 | 498 | { |
2446ab60 | 499 | struct rpc_xprt *xprt; |
1b63a751 CL |
500 | struct rpc_clnt *new; |
501 | int err; | |
1da177e4 | 502 | |
1b63a751 | 503 | err = -ENOMEM; |
2446ab60 TM |
504 | rcu_read_lock(); |
505 | xprt = xprt_get(rcu_dereference(clnt->cl_xprt)); | |
506 | rcu_read_unlock(); | |
507 | if (xprt == NULL) | |
1b63a751 CL |
508 | goto out_err; |
509 | args->servername = xprt->servername; | |
510 | ||
511 | new = rpc_new_client(args, xprt); | |
512 | if (IS_ERR(new)) { | |
513 | err = PTR_ERR(new); | |
514 | goto out_put; | |
515 | } | |
516 | ||
006abe88 | 517 | atomic_inc(&clnt->cl_count); |
1b63a751 CL |
518 | new->cl_parent = clnt; |
519 | ||
520 | /* Turn off autobind on clones */ | |
521 | new->cl_autobind = 0; | |
522 | new->cl_softrtry = clnt->cl_softrtry; | |
523 | new->cl_discrtry = clnt->cl_discrtry; | |
524 | new->cl_chatty = clnt->cl_chatty; | |
1da177e4 | 525 | return new; |
1b63a751 CL |
526 | |
527 | out_put: | |
2446ab60 | 528 | xprt_put(xprt); |
1b63a751 | 529 | out_err: |
0dc47877 | 530 | dprintk("RPC: %s: returned error %d\n", __func__, err); |
3e32a5d9 | 531 | return ERR_PTR(err); |
1da177e4 | 532 | } |
1b63a751 CL |
533 | |
534 | /** | |
535 | * rpc_clone_client - Clone an RPC client structure | |
536 | * | |
537 | * @clnt: RPC client whose parameters are copied | |
538 | * | |
539 | * Returns a fresh RPC client or an ERR_PTR. | |
540 | */ | |
541 | struct rpc_clnt *rpc_clone_client(struct rpc_clnt *clnt) | |
542 | { | |
543 | struct rpc_create_args args = { | |
544 | .program = clnt->cl_program, | |
545 | .prognumber = clnt->cl_prog, | |
546 | .version = clnt->cl_vers, | |
547 | .authflavor = clnt->cl_auth->au_flavor, | |
548 | .client_name = clnt->cl_principal, | |
549 | }; | |
550 | return __rpc_clone_client(&args, clnt); | |
551 | } | |
e8914c65 | 552 | EXPORT_SYMBOL_GPL(rpc_clone_client); |
1da177e4 | 553 | |
ba9b584c CL |
554 | /** |
555 | * rpc_clone_client_set_auth - Clone an RPC client structure and set its auth | |
556 | * | |
557 | * @clnt: RPC client whose parameters are copied | |
7144bca6 | 558 | * @flavor: security flavor for new client |
ba9b584c CL |
559 | * |
560 | * Returns a fresh RPC client or an ERR_PTR. | |
561 | */ | |
562 | struct rpc_clnt * | |
563 | rpc_clone_client_set_auth(struct rpc_clnt *clnt, rpc_authflavor_t flavor) | |
564 | { | |
565 | struct rpc_create_args args = { | |
566 | .program = clnt->cl_program, | |
567 | .prognumber = clnt->cl_prog, | |
568 | .version = clnt->cl_vers, | |
569 | .authflavor = flavor, | |
570 | .client_name = clnt->cl_principal, | |
571 | }; | |
572 | return __rpc_clone_client(&args, clnt); | |
573 | } | |
574 | EXPORT_SYMBOL_GPL(rpc_clone_client_set_auth); | |
575 | ||
58f9612c TM |
576 | /* |
577 | * Kill all tasks for the given client. | |
578 | * XXX: kill their descendants as well? | |
579 | */ | |
580 | void rpc_killall_tasks(struct rpc_clnt *clnt) | |
581 | { | |
582 | struct rpc_task *rovr; | |
583 | ||
584 | ||
585 | if (list_empty(&clnt->cl_tasks)) | |
586 | return; | |
587 | dprintk("RPC: killing all tasks for client %p\n", clnt); | |
588 | /* | |
589 | * Spin lock all_tasks to prevent changes... | |
590 | */ | |
591 | spin_lock(&clnt->cl_lock); | |
592 | list_for_each_entry(rovr, &clnt->cl_tasks, tk_task) { | |
593 | if (!RPC_IS_ACTIVATED(rovr)) | |
594 | continue; | |
595 | if (!(rovr->tk_flags & RPC_TASK_KILLED)) { | |
596 | rovr->tk_flags |= RPC_TASK_KILLED; | |
597 | rpc_exit(rovr, -EIO); | |
8e26de23 SK |
598 | if (RPC_IS_QUEUED(rovr)) |
599 | rpc_wake_up_queued_task(rovr->tk_waitqueue, | |
600 | rovr); | |
58f9612c TM |
601 | } |
602 | } | |
603 | spin_unlock(&clnt->cl_lock); | |
604 | } | |
605 | EXPORT_SYMBOL_GPL(rpc_killall_tasks); | |
606 | ||
1da177e4 LT |
607 | /* |
608 | * Properly shut down an RPC client, terminating all outstanding | |
90c5755f | 609 | * requests. |
1da177e4 | 610 | */ |
4c402b40 | 611 | void rpc_shutdown_client(struct rpc_clnt *clnt) |
1da177e4 | 612 | { |
168e4b39 WAA |
613 | might_sleep(); |
614 | ||
4e0038b6 TM |
615 | dprintk_rcu("RPC: shutting down %s client for %s\n", |
616 | clnt->cl_protname, | |
617 | rcu_dereference(clnt->cl_xprt)->servername); | |
1da177e4 | 618 | |
34f52e35 | 619 | while (!list_empty(&clnt->cl_tasks)) { |
1da177e4 | 620 | rpc_killall_tasks(clnt); |
532347e2 | 621 | wait_event_timeout(destroy_wait, |
34f52e35 | 622 | list_empty(&clnt->cl_tasks), 1*HZ); |
1da177e4 LT |
623 | } |
624 | ||
4c402b40 | 625 | rpc_release_client(clnt); |
1da177e4 | 626 | } |
e8914c65 | 627 | EXPORT_SYMBOL_GPL(rpc_shutdown_client); |
1da177e4 LT |
628 | |
629 | /* | |
34f52e35 | 630 | * Free an RPC client |
1da177e4 | 631 | */ |
34f52e35 | 632 | static void |
006abe88 | 633 | rpc_free_client(struct rpc_clnt *clnt) |
1da177e4 | 634 | { |
4e0038b6 TM |
635 | dprintk_rcu("RPC: destroying %s client for %s\n", |
636 | clnt->cl_protname, | |
637 | rcu_dereference(clnt->cl_xprt)->servername); | |
6eac7d3f | 638 | if (clnt->cl_parent != clnt) |
8ad7c892 | 639 | rpc_release_client(clnt->cl_parent); |
6529eba0 | 640 | rpc_unregister_client(clnt); |
f5131257 | 641 | rpc_clnt_remove_pipedir(clnt); |
11c556b3 | 642 | rpc_free_iostats(clnt->cl_metrics); |
608207e8 | 643 | kfree(clnt->cl_principal); |
11c556b3 | 644 | clnt->cl_metrics = NULL; |
2446ab60 | 645 | xprt_put(rcu_dereference_raw(clnt->cl_xprt)); |
4ada539e | 646 | rpciod_down(); |
1da177e4 | 647 | kfree(clnt); |
1da177e4 LT |
648 | } |
649 | ||
1dd17ec6 TM |
650 | /* |
651 | * Free an RPC client | |
652 | */ | |
653 | static void | |
006abe88 | 654 | rpc_free_auth(struct rpc_clnt *clnt) |
1dd17ec6 | 655 | { |
1dd17ec6 | 656 | if (clnt->cl_auth == NULL) { |
006abe88 | 657 | rpc_free_client(clnt); |
1dd17ec6 TM |
658 | return; |
659 | } | |
660 | ||
661 | /* | |
662 | * Note: RPCSEC_GSS may need to send NULL RPC calls in order to | |
663 | * release remaining GSS contexts. This mechanism ensures | |
664 | * that it can do so safely. | |
665 | */ | |
006abe88 | 666 | atomic_inc(&clnt->cl_count); |
1dd17ec6 TM |
667 | rpcauth_release(clnt->cl_auth); |
668 | clnt->cl_auth = NULL; | |
006abe88 TM |
669 | if (atomic_dec_and_test(&clnt->cl_count)) |
670 | rpc_free_client(clnt); | |
1dd17ec6 TM |
671 | } |
672 | ||
1da177e4 | 673 | /* |
34f52e35 | 674 | * Release reference to the RPC client |
1da177e4 LT |
675 | */ |
676 | void | |
677 | rpc_release_client(struct rpc_clnt *clnt) | |
678 | { | |
34f52e35 | 679 | dprintk("RPC: rpc_release_client(%p)\n", clnt); |
1da177e4 | 680 | |
34f52e35 TM |
681 | if (list_empty(&clnt->cl_tasks)) |
682 | wake_up(&destroy_wait); | |
006abe88 TM |
683 | if (atomic_dec_and_test(&clnt->cl_count)) |
684 | rpc_free_auth(clnt); | |
34f52e35 TM |
685 | } |
686 | ||
007e251f AG |
687 | /** |
688 | * rpc_bind_new_program - bind a new RPC program to an existing client | |
65b6e42c RD |
689 | * @old: old rpc_client |
690 | * @program: rpc program to set | |
691 | * @vers: rpc program version | |
007e251f AG |
692 | * |
693 | * Clones the rpc client and sets up a new RPC program. This is mainly | |
694 | * of use for enabling different RPC programs to share the same transport. | |
695 | * The Sun NFSv2/v3 ACL protocol can do this. | |
696 | */ | |
697 | struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old, | |
a613fa16 | 698 | const struct rpc_program *program, |
89eb21c3 | 699 | u32 vers) |
007e251f | 700 | { |
f994c43d TM |
701 | struct rpc_create_args args = { |
702 | .program = program, | |
703 | .prognumber = program->number, | |
704 | .version = vers, | |
705 | .authflavor = old->cl_auth->au_flavor, | |
706 | .client_name = old->cl_principal, | |
707 | }; | |
007e251f | 708 | struct rpc_clnt *clnt; |
007e251f AG |
709 | int err; |
710 | ||
f994c43d | 711 | clnt = __rpc_clone_client(&args, old); |
007e251f AG |
712 | if (IS_ERR(clnt)) |
713 | goto out; | |
caabea8a | 714 | err = rpc_ping(clnt); |
007e251f AG |
715 | if (err != 0) { |
716 | rpc_shutdown_client(clnt); | |
717 | clnt = ERR_PTR(err); | |
718 | } | |
cca5172a | 719 | out: |
007e251f AG |
720 | return clnt; |
721 | } | |
e8914c65 | 722 | EXPORT_SYMBOL_GPL(rpc_bind_new_program); |
007e251f | 723 | |
58f9612c TM |
724 | void rpc_task_release_client(struct rpc_task *task) |
725 | { | |
726 | struct rpc_clnt *clnt = task->tk_client; | |
727 | ||
728 | if (clnt != NULL) { | |
729 | /* Remove from client task list */ | |
730 | spin_lock(&clnt->cl_lock); | |
731 | list_del(&task->tk_task); | |
732 | spin_unlock(&clnt->cl_lock); | |
733 | task->tk_client = NULL; | |
734 | ||
735 | rpc_release_client(clnt); | |
736 | } | |
737 | } | |
738 | ||
739 | static | |
740 | void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt) | |
741 | { | |
742 | if (clnt != NULL) { | |
743 | rpc_task_release_client(task); | |
744 | task->tk_client = clnt; | |
006abe88 | 745 | atomic_inc(&clnt->cl_count); |
58f9612c TM |
746 | if (clnt->cl_softrtry) |
747 | task->tk_flags |= RPC_TASK_SOFT; | |
a564b8f0 MG |
748 | if (sk_memalloc_socks()) { |
749 | struct rpc_xprt *xprt; | |
750 | ||
751 | rcu_read_lock(); | |
752 | xprt = rcu_dereference(clnt->cl_xprt); | |
753 | if (xprt->swapper) | |
754 | task->tk_flags |= RPC_TASK_SWAPPER; | |
755 | rcu_read_unlock(); | |
756 | } | |
58f9612c TM |
757 | /* Add to the client's list of all tasks */ |
758 | spin_lock(&clnt->cl_lock); | |
759 | list_add_tail(&task->tk_task, &clnt->cl_tasks); | |
760 | spin_unlock(&clnt->cl_lock); | |
761 | } | |
762 | } | |
763 | ||
cbdabc7f AA |
764 | void rpc_task_reset_client(struct rpc_task *task, struct rpc_clnt *clnt) |
765 | { | |
766 | rpc_task_release_client(task); | |
767 | rpc_task_set_client(task, clnt); | |
768 | } | |
769 | EXPORT_SYMBOL_GPL(rpc_task_reset_client); | |
770 | ||
771 | ||
58f9612c TM |
772 | static void |
773 | rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg) | |
774 | { | |
775 | if (msg != NULL) { | |
776 | task->tk_msg.rpc_proc = msg->rpc_proc; | |
777 | task->tk_msg.rpc_argp = msg->rpc_argp; | |
778 | task->tk_msg.rpc_resp = msg->rpc_resp; | |
a17c2153 TM |
779 | if (msg->rpc_cred != NULL) |
780 | task->tk_msg.rpc_cred = get_rpccred(msg->rpc_cred); | |
58f9612c TM |
781 | } |
782 | } | |
783 | ||
1da177e4 LT |
784 | /* |
785 | * Default callback for async RPC calls | |
786 | */ | |
787 | static void | |
963d8fe5 | 788 | rpc_default_callback(struct rpc_task *task, void *data) |
1da177e4 LT |
789 | { |
790 | } | |
791 | ||
963d8fe5 TM |
792 | static const struct rpc_call_ops rpc_default_ops = { |
793 | .rpc_call_done = rpc_default_callback, | |
794 | }; | |
795 | ||
c970aa85 TM |
796 | /** |
797 | * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it | |
798 | * @task_setup_data: pointer to task initialisation data | |
799 | */ | |
800 | struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data) | |
6e5b70e9 | 801 | { |
19445b99 | 802 | struct rpc_task *task; |
6e5b70e9 | 803 | |
84115e1c | 804 | task = rpc_new_task(task_setup_data); |
19445b99 | 805 | if (IS_ERR(task)) |
50859259 | 806 | goto out; |
6e5b70e9 | 807 | |
58f9612c TM |
808 | rpc_task_set_client(task, task_setup_data->rpc_client); |
809 | rpc_task_set_rpc_message(task, task_setup_data->rpc_message); | |
810 | ||
58f9612c TM |
811 | if (task->tk_action == NULL) |
812 | rpc_call_start(task); | |
813 | ||
6e5b70e9 TM |
814 | atomic_inc(&task->tk_count); |
815 | rpc_execute(task); | |
6e5b70e9 | 816 | out: |
19445b99 | 817 | return task; |
6e5b70e9 | 818 | } |
c970aa85 | 819 | EXPORT_SYMBOL_GPL(rpc_run_task); |
6e5b70e9 TM |
820 | |
821 | /** | |
822 | * rpc_call_sync - Perform a synchronous RPC call | |
823 | * @clnt: pointer to RPC client | |
824 | * @msg: RPC call parameters | |
825 | * @flags: RPC call flags | |
1da177e4 | 826 | */ |
cbc20059 | 827 | int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags) |
1da177e4 LT |
828 | { |
829 | struct rpc_task *task; | |
84115e1c TM |
830 | struct rpc_task_setup task_setup_data = { |
831 | .rpc_client = clnt, | |
832 | .rpc_message = msg, | |
833 | .callback_ops = &rpc_default_ops, | |
834 | .flags = flags, | |
835 | }; | |
6e5b70e9 | 836 | int status; |
1da177e4 | 837 | |
50d2bdb1 WAA |
838 | WARN_ON_ONCE(flags & RPC_TASK_ASYNC); |
839 | if (flags & RPC_TASK_ASYNC) { | |
840 | rpc_release_calldata(task_setup_data.callback_ops, | |
841 | task_setup_data.callback_data); | |
842 | return -EINVAL; | |
843 | } | |
1da177e4 | 844 | |
c970aa85 | 845 | task = rpc_run_task(&task_setup_data); |
6e5b70e9 TM |
846 | if (IS_ERR(task)) |
847 | return PTR_ERR(task); | |
e60859ac | 848 | status = task->tk_status; |
bde8f00c | 849 | rpc_put_task(task); |
1da177e4 LT |
850 | return status; |
851 | } | |
e8914c65 | 852 | EXPORT_SYMBOL_GPL(rpc_call_sync); |
1da177e4 | 853 | |
6e5b70e9 TM |
854 | /** |
855 | * rpc_call_async - Perform an asynchronous RPC call | |
856 | * @clnt: pointer to RPC client | |
857 | * @msg: RPC call parameters | |
858 | * @flags: RPC call flags | |
65b6e42c | 859 | * @tk_ops: RPC call ops |
6e5b70e9 | 860 | * @data: user call data |
1da177e4 LT |
861 | */ |
862 | int | |
cbc20059 | 863 | rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags, |
963d8fe5 | 864 | const struct rpc_call_ops *tk_ops, void *data) |
1da177e4 LT |
865 | { |
866 | struct rpc_task *task; | |
84115e1c TM |
867 | struct rpc_task_setup task_setup_data = { |
868 | .rpc_client = clnt, | |
869 | .rpc_message = msg, | |
870 | .callback_ops = tk_ops, | |
871 | .callback_data = data, | |
872 | .flags = flags|RPC_TASK_ASYNC, | |
873 | }; | |
1da177e4 | 874 | |
c970aa85 | 875 | task = rpc_run_task(&task_setup_data); |
6e5b70e9 TM |
876 | if (IS_ERR(task)) |
877 | return PTR_ERR(task); | |
878 | rpc_put_task(task); | |
879 | return 0; | |
1da177e4 | 880 | } |
e8914c65 | 881 | EXPORT_SYMBOL_GPL(rpc_call_async); |
1da177e4 | 882 | |
9e00abc3 | 883 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
55ae1aab RL |
884 | /** |
885 | * rpc_run_bc_task - Allocate a new RPC task for backchannel use, then run | |
886 | * rpc_execute against it | |
7a73fdde JSR |
887 | * @req: RPC request |
888 | * @tk_ops: RPC call ops | |
55ae1aab RL |
889 | */ |
890 | struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req, | |
7a73fdde | 891 | const struct rpc_call_ops *tk_ops) |
55ae1aab RL |
892 | { |
893 | struct rpc_task *task; | |
894 | struct xdr_buf *xbufp = &req->rq_snd_buf; | |
895 | struct rpc_task_setup task_setup_data = { | |
896 | .callback_ops = tk_ops, | |
897 | }; | |
898 | ||
899 | dprintk("RPC: rpc_run_bc_task req= %p\n", req); | |
900 | /* | |
901 | * Create an rpc_task to send the data | |
902 | */ | |
903 | task = rpc_new_task(&task_setup_data); | |
19445b99 | 904 | if (IS_ERR(task)) { |
55ae1aab RL |
905 | xprt_free_bc_request(req); |
906 | goto out; | |
907 | } | |
908 | task->tk_rqstp = req; | |
909 | ||
910 | /* | |
911 | * Set up the xdr_buf length. | |
912 | * This also indicates that the buffer is XDR encoded already. | |
913 | */ | |
914 | xbufp->len = xbufp->head[0].iov_len + xbufp->page_len + | |
915 | xbufp->tail[0].iov_len; | |
916 | ||
917 | task->tk_action = call_bc_transmit; | |
918 | atomic_inc(&task->tk_count); | |
9a6478f6 | 919 | WARN_ON_ONCE(atomic_read(&task->tk_count) != 2); |
55ae1aab RL |
920 | rpc_execute(task); |
921 | ||
922 | out: | |
923 | dprintk("RPC: rpc_run_bc_task: task= %p\n", task); | |
924 | return task; | |
925 | } | |
9e00abc3 | 926 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
55ae1aab | 927 | |
77de2c59 TM |
928 | void |
929 | rpc_call_start(struct rpc_task *task) | |
930 | { | |
931 | task->tk_action = call_start; | |
932 | } | |
933 | EXPORT_SYMBOL_GPL(rpc_call_start); | |
934 | ||
ed39440a CL |
935 | /** |
936 | * rpc_peeraddr - extract remote peer address from clnt's xprt | |
937 | * @clnt: RPC client structure | |
938 | * @buf: target buffer | |
65b6e42c | 939 | * @bufsize: length of target buffer |
ed39440a CL |
940 | * |
941 | * Returns the number of bytes that are actually in the stored address. | |
942 | */ | |
943 | size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize) | |
944 | { | |
945 | size_t bytes; | |
2446ab60 TM |
946 | struct rpc_xprt *xprt; |
947 | ||
948 | rcu_read_lock(); | |
949 | xprt = rcu_dereference(clnt->cl_xprt); | |
ed39440a | 950 | |
2446ab60 | 951 | bytes = xprt->addrlen; |
ed39440a CL |
952 | if (bytes > bufsize) |
953 | bytes = bufsize; | |
2446ab60 TM |
954 | memcpy(buf, &xprt->addr, bytes); |
955 | rcu_read_unlock(); | |
956 | ||
957 | return bytes; | |
ed39440a | 958 | } |
b86acd50 | 959 | EXPORT_SYMBOL_GPL(rpc_peeraddr); |
ed39440a | 960 | |
f425eba4 CL |
961 | /** |
962 | * rpc_peeraddr2str - return remote peer address in printable format | |
963 | * @clnt: RPC client structure | |
964 | * @format: address format | |
965 | * | |
2446ab60 TM |
966 | * NB: the lifetime of the memory referenced by the returned pointer is |
967 | * the same as the rpc_xprt itself. As long as the caller uses this | |
968 | * pointer, it must hold the RCU read lock. | |
f425eba4 | 969 | */ |
b454ae90 CL |
970 | const char *rpc_peeraddr2str(struct rpc_clnt *clnt, |
971 | enum rpc_display_format_t format) | |
f425eba4 | 972 | { |
2446ab60 TM |
973 | struct rpc_xprt *xprt; |
974 | ||
975 | xprt = rcu_dereference(clnt->cl_xprt); | |
7559c7a2 CL |
976 | |
977 | if (xprt->address_strings[format] != NULL) | |
978 | return xprt->address_strings[format]; | |
979 | else | |
980 | return "unprintable"; | |
f425eba4 | 981 | } |
b86acd50 | 982 | EXPORT_SYMBOL_GPL(rpc_peeraddr2str); |
f425eba4 | 983 | |
2e738fdc CL |
984 | static const struct sockaddr_in rpc_inaddr_loopback = { |
985 | .sin_family = AF_INET, | |
986 | .sin_addr.s_addr = htonl(INADDR_ANY), | |
987 | }; | |
988 | ||
989 | static const struct sockaddr_in6 rpc_in6addr_loopback = { | |
990 | .sin6_family = AF_INET6, | |
991 | .sin6_addr = IN6ADDR_ANY_INIT, | |
992 | }; | |
993 | ||
994 | /* | |
995 | * Try a getsockname() on a connected datagram socket. Using a | |
996 | * connected datagram socket prevents leaving a socket in TIME_WAIT. | |
997 | * This conserves the ephemeral port number space. | |
998 | * | |
999 | * Returns zero and fills in "buf" if successful; otherwise, a | |
1000 | * negative errno is returned. | |
1001 | */ | |
1002 | static int rpc_sockname(struct net *net, struct sockaddr *sap, size_t salen, | |
1003 | struct sockaddr *buf, int buflen) | |
1004 | { | |
1005 | struct socket *sock; | |
1006 | int err; | |
1007 | ||
1008 | err = __sock_create(net, sap->sa_family, | |
1009 | SOCK_DGRAM, IPPROTO_UDP, &sock, 1); | |
1010 | if (err < 0) { | |
1011 | dprintk("RPC: can't create UDP socket (%d)\n", err); | |
1012 | goto out; | |
1013 | } | |
1014 | ||
1015 | switch (sap->sa_family) { | |
1016 | case AF_INET: | |
1017 | err = kernel_bind(sock, | |
1018 | (struct sockaddr *)&rpc_inaddr_loopback, | |
1019 | sizeof(rpc_inaddr_loopback)); | |
1020 | break; | |
1021 | case AF_INET6: | |
1022 | err = kernel_bind(sock, | |
1023 | (struct sockaddr *)&rpc_in6addr_loopback, | |
1024 | sizeof(rpc_in6addr_loopback)); | |
1025 | break; | |
1026 | default: | |
1027 | err = -EAFNOSUPPORT; | |
1028 | goto out; | |
1029 | } | |
1030 | if (err < 0) { | |
1031 | dprintk("RPC: can't bind UDP socket (%d)\n", err); | |
1032 | goto out_release; | |
1033 | } | |
1034 | ||
1035 | err = kernel_connect(sock, sap, salen, 0); | |
1036 | if (err < 0) { | |
1037 | dprintk("RPC: can't connect UDP socket (%d)\n", err); | |
1038 | goto out_release; | |
1039 | } | |
1040 | ||
1041 | err = kernel_getsockname(sock, buf, &buflen); | |
1042 | if (err < 0) { | |
1043 | dprintk("RPC: getsockname failed (%d)\n", err); | |
1044 | goto out_release; | |
1045 | } | |
1046 | ||
1047 | err = 0; | |
1048 | if (buf->sa_family == AF_INET6) { | |
1049 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)buf; | |
1050 | sin6->sin6_scope_id = 0; | |
1051 | } | |
1052 | dprintk("RPC: %s succeeded\n", __func__); | |
1053 | ||
1054 | out_release: | |
1055 | sock_release(sock); | |
1056 | out: | |
1057 | return err; | |
1058 | } | |
1059 | ||
1060 | /* | |
1061 | * Scraping a connected socket failed, so we don't have a useable | |
1062 | * local address. Fallback: generate an address that will prevent | |
1063 | * the server from calling us back. | |
1064 | * | |
1065 | * Returns zero and fills in "buf" if successful; otherwise, a | |
1066 | * negative errno is returned. | |
1067 | */ | |
1068 | static int rpc_anyaddr(int family, struct sockaddr *buf, size_t buflen) | |
1069 | { | |
1070 | switch (family) { | |
1071 | case AF_INET: | |
1072 | if (buflen < sizeof(rpc_inaddr_loopback)) | |
1073 | return -EINVAL; | |
1074 | memcpy(buf, &rpc_inaddr_loopback, | |
1075 | sizeof(rpc_inaddr_loopback)); | |
1076 | break; | |
1077 | case AF_INET6: | |
1078 | if (buflen < sizeof(rpc_in6addr_loopback)) | |
1079 | return -EINVAL; | |
1080 | memcpy(buf, &rpc_in6addr_loopback, | |
1081 | sizeof(rpc_in6addr_loopback)); | |
1082 | default: | |
1083 | dprintk("RPC: %s: address family not supported\n", | |
1084 | __func__); | |
1085 | return -EAFNOSUPPORT; | |
1086 | } | |
1087 | dprintk("RPC: %s: succeeded\n", __func__); | |
1088 | return 0; | |
1089 | } | |
1090 | ||
1091 | /** | |
1092 | * rpc_localaddr - discover local endpoint address for an RPC client | |
1093 | * @clnt: RPC client structure | |
1094 | * @buf: target buffer | |
1095 | * @buflen: size of target buffer, in bytes | |
1096 | * | |
1097 | * Returns zero and fills in "buf" and "buflen" if successful; | |
1098 | * otherwise, a negative errno is returned. | |
1099 | * | |
1100 | * This works even if the underlying transport is not currently connected, | |
1101 | * or if the upper layer never previously provided a source address. | |
1102 | * | |
1103 | * The result of this function call is transient: multiple calls in | |
1104 | * succession may give different results, depending on how local | |
1105 | * networking configuration changes over time. | |
1106 | */ | |
1107 | int rpc_localaddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t buflen) | |
1108 | { | |
1109 | struct sockaddr_storage address; | |
1110 | struct sockaddr *sap = (struct sockaddr *)&address; | |
1111 | struct rpc_xprt *xprt; | |
1112 | struct net *net; | |
1113 | size_t salen; | |
1114 | int err; | |
1115 | ||
1116 | rcu_read_lock(); | |
1117 | xprt = rcu_dereference(clnt->cl_xprt); | |
1118 | salen = xprt->addrlen; | |
1119 | memcpy(sap, &xprt->addr, salen); | |
1120 | net = get_net(xprt->xprt_net); | |
1121 | rcu_read_unlock(); | |
1122 | ||
1123 | rpc_set_port(sap, 0); | |
1124 | err = rpc_sockname(net, sap, salen, buf, buflen); | |
1125 | put_net(net); | |
1126 | if (err != 0) | |
1127 | /* Couldn't discover local address, return ANYADDR */ | |
1128 | return rpc_anyaddr(sap->sa_family, buf, buflen); | |
1129 | return 0; | |
1130 | } | |
1131 | EXPORT_SYMBOL_GPL(rpc_localaddr); | |
1132 | ||
1da177e4 LT |
1133 | void |
1134 | rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize) | |
1135 | { | |
2446ab60 TM |
1136 | struct rpc_xprt *xprt; |
1137 | ||
1138 | rcu_read_lock(); | |
1139 | xprt = rcu_dereference(clnt->cl_xprt); | |
470056c2 CL |
1140 | if (xprt->ops->set_buffer_size) |
1141 | xprt->ops->set_buffer_size(xprt, sndsize, rcvsize); | |
2446ab60 | 1142 | rcu_read_unlock(); |
1da177e4 | 1143 | } |
e8914c65 | 1144 | EXPORT_SYMBOL_GPL(rpc_setbufsize); |
1da177e4 | 1145 | |
2446ab60 TM |
1146 | /** |
1147 | * rpc_protocol - Get transport protocol number for an RPC client | |
1148 | * @clnt: RPC client to query | |
1149 | * | |
1150 | */ | |
1151 | int rpc_protocol(struct rpc_clnt *clnt) | |
1152 | { | |
1153 | int protocol; | |
1154 | ||
1155 | rcu_read_lock(); | |
1156 | protocol = rcu_dereference(clnt->cl_xprt)->prot; | |
1157 | rcu_read_unlock(); | |
1158 | return protocol; | |
1159 | } | |
1160 | EXPORT_SYMBOL_GPL(rpc_protocol); | |
1161 | ||
1162 | /** | |
1163 | * rpc_net_ns - Get the network namespace for this RPC client | |
1164 | * @clnt: RPC client to query | |
1165 | * | |
1166 | */ | |
1167 | struct net *rpc_net_ns(struct rpc_clnt *clnt) | |
1168 | { | |
1169 | struct net *ret; | |
1170 | ||
1171 | rcu_read_lock(); | |
1172 | ret = rcu_dereference(clnt->cl_xprt)->xprt_net; | |
1173 | rcu_read_unlock(); | |
1174 | return ret; | |
1175 | } | |
1176 | EXPORT_SYMBOL_GPL(rpc_net_ns); | |
1177 | ||
1178 | /** | |
1179 | * rpc_max_payload - Get maximum payload size for a transport, in bytes | |
1180 | * @clnt: RPC client to query | |
1da177e4 LT |
1181 | * |
1182 | * For stream transports, this is one RPC record fragment (see RFC | |
1183 | * 1831), as we don't support multi-record requests yet. For datagram | |
1184 | * transports, this is the size of an IP packet minus the IP, UDP, and | |
1185 | * RPC header sizes. | |
1186 | */ | |
1187 | size_t rpc_max_payload(struct rpc_clnt *clnt) | |
1188 | { | |
2446ab60 TM |
1189 | size_t ret; |
1190 | ||
1191 | rcu_read_lock(); | |
1192 | ret = rcu_dereference(clnt->cl_xprt)->max_payload; | |
1193 | rcu_read_unlock(); | |
1194 | return ret; | |
1da177e4 | 1195 | } |
b86acd50 | 1196 | EXPORT_SYMBOL_GPL(rpc_max_payload); |
1da177e4 | 1197 | |
35f5a422 CL |
1198 | /** |
1199 | * rpc_force_rebind - force transport to check that remote port is unchanged | |
1200 | * @clnt: client to rebind | |
1201 | * | |
1202 | */ | |
1203 | void rpc_force_rebind(struct rpc_clnt *clnt) | |
1204 | { | |
2446ab60 TM |
1205 | if (clnt->cl_autobind) { |
1206 | rcu_read_lock(); | |
1207 | xprt_clear_bound(rcu_dereference(clnt->cl_xprt)); | |
1208 | rcu_read_unlock(); | |
1209 | } | |
35f5a422 | 1210 | } |
b86acd50 | 1211 | EXPORT_SYMBOL_GPL(rpc_force_rebind); |
35f5a422 | 1212 | |
aae2006e AA |
1213 | /* |
1214 | * Restart an (async) RPC call from the call_prepare state. | |
1215 | * Usually called from within the exit handler. | |
1216 | */ | |
f1f88fc7 | 1217 | int |
aae2006e AA |
1218 | rpc_restart_call_prepare(struct rpc_task *task) |
1219 | { | |
1220 | if (RPC_ASSASSINATED(task)) | |
f1f88fc7 | 1221 | return 0; |
d00c5d43 TM |
1222 | task->tk_action = call_start; |
1223 | if (task->tk_ops->rpc_call_prepare != NULL) | |
1224 | task->tk_action = rpc_prepare_task; | |
f1f88fc7 | 1225 | return 1; |
aae2006e AA |
1226 | } |
1227 | EXPORT_SYMBOL_GPL(rpc_restart_call_prepare); | |
1228 | ||
1da177e4 LT |
1229 | /* |
1230 | * Restart an (async) RPC call. Usually called from within the | |
1231 | * exit handler. | |
1232 | */ | |
f1f88fc7 | 1233 | int |
1da177e4 LT |
1234 | rpc_restart_call(struct rpc_task *task) |
1235 | { | |
1236 | if (RPC_ASSASSINATED(task)) | |
f1f88fc7 | 1237 | return 0; |
1da177e4 | 1238 | task->tk_action = call_start; |
f1f88fc7 | 1239 | return 1; |
1da177e4 | 1240 | } |
e8914c65 | 1241 | EXPORT_SYMBOL_GPL(rpc_restart_call); |
1da177e4 | 1242 | |
3748f1e4 CL |
1243 | #ifdef RPC_DEBUG |
1244 | static const char *rpc_proc_name(const struct rpc_task *task) | |
1245 | { | |
1246 | const struct rpc_procinfo *proc = task->tk_msg.rpc_proc; | |
1247 | ||
1248 | if (proc) { | |
1249 | if (proc->p_name) | |
1250 | return proc->p_name; | |
1251 | else | |
1252 | return "NULL"; | |
1253 | } else | |
1254 | return "no proc"; | |
1255 | } | |
1256 | #endif | |
1257 | ||
1da177e4 LT |
1258 | /* |
1259 | * 0. Initial state | |
1260 | * | |
1261 | * Other FSM states can be visited zero or more times, but | |
1262 | * this state is visited exactly once for each RPC. | |
1263 | */ | |
1264 | static void | |
1265 | call_start(struct rpc_task *task) | |
1266 | { | |
1267 | struct rpc_clnt *clnt = task->tk_client; | |
1268 | ||
3748f1e4 | 1269 | dprintk("RPC: %5u call_start %s%d proc %s (%s)\n", task->tk_pid, |
46121cf7 | 1270 | clnt->cl_protname, clnt->cl_vers, |
3748f1e4 | 1271 | rpc_proc_name(task), |
46121cf7 | 1272 | (RPC_IS_ASYNC(task) ? "async" : "sync")); |
1da177e4 LT |
1273 | |
1274 | /* Increment call count */ | |
1275 | task->tk_msg.rpc_proc->p_count++; | |
1276 | clnt->cl_stats->rpccnt++; | |
1277 | task->tk_action = call_reserve; | |
1278 | } | |
1279 | ||
1280 | /* | |
1281 | * 1. Reserve an RPC call slot | |
1282 | */ | |
1283 | static void | |
1284 | call_reserve(struct rpc_task *task) | |
1285 | { | |
46121cf7 | 1286 | dprint_status(task); |
1da177e4 | 1287 | |
1da177e4 LT |
1288 | task->tk_status = 0; |
1289 | task->tk_action = call_reserveresult; | |
1290 | xprt_reserve(task); | |
1291 | } | |
1292 | ||
1293 | /* | |
1294 | * 1b. Grok the result of xprt_reserve() | |
1295 | */ | |
1296 | static void | |
1297 | call_reserveresult(struct rpc_task *task) | |
1298 | { | |
1299 | int status = task->tk_status; | |
1300 | ||
46121cf7 | 1301 | dprint_status(task); |
1da177e4 LT |
1302 | |
1303 | /* | |
1304 | * After a call to xprt_reserve(), we must have either | |
1305 | * a request slot or else an error status. | |
1306 | */ | |
1307 | task->tk_status = 0; | |
1308 | if (status >= 0) { | |
1309 | if (task->tk_rqstp) { | |
f2d47d02 | 1310 | task->tk_action = call_refresh; |
1da177e4 LT |
1311 | return; |
1312 | } | |
1313 | ||
1314 | printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n", | |
0dc47877 | 1315 | __func__, status); |
1da177e4 LT |
1316 | rpc_exit(task, -EIO); |
1317 | return; | |
1318 | } | |
1319 | ||
1320 | /* | |
1321 | * Even though there was an error, we may have acquired | |
1322 | * a request slot somehow. Make sure not to leak it. | |
1323 | */ | |
1324 | if (task->tk_rqstp) { | |
1325 | printk(KERN_ERR "%s: status=%d, request allocated anyway\n", | |
0dc47877 | 1326 | __func__, status); |
1da177e4 LT |
1327 | xprt_release(task); |
1328 | } | |
1329 | ||
1330 | switch (status) { | |
1afeaf5c TM |
1331 | case -ENOMEM: |
1332 | rpc_delay(task, HZ >> 2); | |
1da177e4 LT |
1333 | case -EAGAIN: /* woken up; retry */ |
1334 | task->tk_action = call_reserve; | |
1335 | return; | |
1336 | case -EIO: /* probably a shutdown */ | |
1337 | break; | |
1338 | default: | |
1339 | printk(KERN_ERR "%s: unrecognized error %d, exiting\n", | |
0dc47877 | 1340 | __func__, status); |
1da177e4 LT |
1341 | break; |
1342 | } | |
1343 | rpc_exit(task, status); | |
1344 | } | |
1345 | ||
1346 | /* | |
55576244 BF |
1347 | * 2. Bind and/or refresh the credentials |
1348 | */ | |
1349 | static void | |
1350 | call_refresh(struct rpc_task *task) | |
1351 | { | |
1352 | dprint_status(task); | |
1353 | ||
1354 | task->tk_action = call_refreshresult; | |
1355 | task->tk_status = 0; | |
1356 | task->tk_client->cl_stats->rpcauthrefresh++; | |
1357 | rpcauth_refreshcred(task); | |
1358 | } | |
1359 | ||
1360 | /* | |
1361 | * 2a. Process the results of a credential refresh | |
1362 | */ | |
1363 | static void | |
1364 | call_refreshresult(struct rpc_task *task) | |
1365 | { | |
1366 | int status = task->tk_status; | |
1367 | ||
1368 | dprint_status(task); | |
1369 | ||
1370 | task->tk_status = 0; | |
5fc43978 | 1371 | task->tk_action = call_refresh; |
55576244 | 1372 | switch (status) { |
5fc43978 TM |
1373 | case 0: |
1374 | if (rpcauth_uptodatecred(task)) | |
1375 | task->tk_action = call_allocate; | |
55576244 BF |
1376 | return; |
1377 | case -ETIMEDOUT: | |
1378 | rpc_delay(task, 3*HZ); | |
eb96d5c9 | 1379 | case -EKEYEXPIRED: |
5fc43978 TM |
1380 | case -EAGAIN: |
1381 | status = -EACCES; | |
1382 | if (!task->tk_cred_retry) | |
1383 | break; | |
1384 | task->tk_cred_retry--; | |
1385 | dprintk("RPC: %5u %s: retry refresh creds\n", | |
1386 | task->tk_pid, __func__); | |
1387 | return; | |
55576244 | 1388 | } |
5fc43978 TM |
1389 | dprintk("RPC: %5u %s: refresh creds failed with error %d\n", |
1390 | task->tk_pid, __func__, status); | |
1391 | rpc_exit(task, status); | |
55576244 BF |
1392 | } |
1393 | ||
1394 | /* | |
1395 | * 2b. Allocate the buffer. For details, see sched.c:rpc_malloc. | |
02107148 | 1396 | * (Note: buffer memory is freed in xprt_release). |
1da177e4 LT |
1397 | */ |
1398 | static void | |
1399 | call_allocate(struct rpc_task *task) | |
1400 | { | |
f2d47d02 | 1401 | unsigned int slack = task->tk_rqstp->rq_cred->cr_auth->au_cslack; |
02107148 CL |
1402 | struct rpc_rqst *req = task->tk_rqstp; |
1403 | struct rpc_xprt *xprt = task->tk_xprt; | |
2bea90d4 | 1404 | struct rpc_procinfo *proc = task->tk_msg.rpc_proc; |
1da177e4 | 1405 | |
46121cf7 CL |
1406 | dprint_status(task); |
1407 | ||
2bea90d4 | 1408 | task->tk_status = 0; |
f2d47d02 | 1409 | task->tk_action = call_bind; |
2bea90d4 | 1410 | |
02107148 | 1411 | if (req->rq_buffer) |
1da177e4 LT |
1412 | return; |
1413 | ||
2bea90d4 CL |
1414 | if (proc->p_proc != 0) { |
1415 | BUG_ON(proc->p_arglen == 0); | |
1416 | if (proc->p_decode != NULL) | |
1417 | BUG_ON(proc->p_replen == 0); | |
1418 | } | |
1da177e4 | 1419 | |
2bea90d4 CL |
1420 | /* |
1421 | * Calculate the size (in quads) of the RPC call | |
1422 | * and reply headers, and convert both values | |
1423 | * to byte sizes. | |
1424 | */ | |
1425 | req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen; | |
1426 | req->rq_callsize <<= 2; | |
1427 | req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen; | |
1428 | req->rq_rcvsize <<= 2; | |
1429 | ||
c5a4dd8b CL |
1430 | req->rq_buffer = xprt->ops->buf_alloc(task, |
1431 | req->rq_callsize + req->rq_rcvsize); | |
2bea90d4 | 1432 | if (req->rq_buffer != NULL) |
1da177e4 | 1433 | return; |
46121cf7 CL |
1434 | |
1435 | dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid); | |
1da177e4 | 1436 | |
5afa9133 | 1437 | if (RPC_IS_ASYNC(task) || !fatal_signal_pending(current)) { |
b6e9c713 | 1438 | task->tk_action = call_allocate; |
1da177e4 LT |
1439 | rpc_delay(task, HZ>>4); |
1440 | return; | |
1441 | } | |
1442 | ||
1443 | rpc_exit(task, -ERESTARTSYS); | |
1444 | } | |
1445 | ||
940e3318 TM |
1446 | static inline int |
1447 | rpc_task_need_encode(struct rpc_task *task) | |
1448 | { | |
1449 | return task->tk_rqstp->rq_snd_buf.len == 0; | |
1450 | } | |
1451 | ||
1452 | static inline void | |
1453 | rpc_task_force_reencode(struct rpc_task *task) | |
1454 | { | |
1455 | task->tk_rqstp->rq_snd_buf.len = 0; | |
2574cc9f | 1456 | task->tk_rqstp->rq_bytes_sent = 0; |
940e3318 TM |
1457 | } |
1458 | ||
2bea90d4 CL |
1459 | static inline void |
1460 | rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len) | |
1461 | { | |
1462 | buf->head[0].iov_base = start; | |
1463 | buf->head[0].iov_len = len; | |
1464 | buf->tail[0].iov_len = 0; | |
1465 | buf->page_len = 0; | |
4f22ccc3 | 1466 | buf->flags = 0; |
2bea90d4 CL |
1467 | buf->len = 0; |
1468 | buf->buflen = len; | |
1469 | } | |
1470 | ||
1da177e4 LT |
1471 | /* |
1472 | * 3. Encode arguments of an RPC call | |
1473 | */ | |
1474 | static void | |
b0e1c57e | 1475 | rpc_xdr_encode(struct rpc_task *task) |
1da177e4 | 1476 | { |
1da177e4 | 1477 | struct rpc_rqst *req = task->tk_rqstp; |
9f06c719 | 1478 | kxdreproc_t encode; |
d8ed029d | 1479 | __be32 *p; |
1da177e4 | 1480 | |
46121cf7 | 1481 | dprint_status(task); |
1da177e4 | 1482 | |
2bea90d4 CL |
1483 | rpc_xdr_buf_init(&req->rq_snd_buf, |
1484 | req->rq_buffer, | |
1485 | req->rq_callsize); | |
1486 | rpc_xdr_buf_init(&req->rq_rcv_buf, | |
1487 | (char *)req->rq_buffer + req->rq_callsize, | |
1488 | req->rq_rcvsize); | |
1da177e4 | 1489 | |
b0e1c57e CL |
1490 | p = rpc_encode_header(task); |
1491 | if (p == NULL) { | |
1492 | printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n"); | |
1da177e4 LT |
1493 | rpc_exit(task, -EIO); |
1494 | return; | |
1495 | } | |
b0e1c57e CL |
1496 | |
1497 | encode = task->tk_msg.rpc_proc->p_encode; | |
f3680312 BF |
1498 | if (encode == NULL) |
1499 | return; | |
1500 | ||
1501 | task->tk_status = rpcauth_wrap_req(task, encode, req, p, | |
1502 | task->tk_msg.rpc_argp); | |
1da177e4 LT |
1503 | } |
1504 | ||
1505 | /* | |
1506 | * 4. Get the server port number if not yet set | |
1507 | */ | |
1508 | static void | |
1509 | call_bind(struct rpc_task *task) | |
1510 | { | |
ec739ef0 | 1511 | struct rpc_xprt *xprt = task->tk_xprt; |
1da177e4 | 1512 | |
46121cf7 | 1513 | dprint_status(task); |
1da177e4 | 1514 | |
da351878 | 1515 | task->tk_action = call_connect; |
ec739ef0 | 1516 | if (!xprt_bound(xprt)) { |
da351878 | 1517 | task->tk_action = call_bind_status; |
ec739ef0 | 1518 | task->tk_timeout = xprt->bind_timeout; |
bbf7c1dd | 1519 | xprt->ops->rpcbind(task); |
1da177e4 LT |
1520 | } |
1521 | } | |
1522 | ||
1523 | /* | |
da351878 CL |
1524 | * 4a. Sort out bind result |
1525 | */ | |
1526 | static void | |
1527 | call_bind_status(struct rpc_task *task) | |
1528 | { | |
906462af | 1529 | int status = -EIO; |
da351878 CL |
1530 | |
1531 | if (task->tk_status >= 0) { | |
46121cf7 | 1532 | dprint_status(task); |
da351878 CL |
1533 | task->tk_status = 0; |
1534 | task->tk_action = call_connect; | |
1535 | return; | |
1536 | } | |
1537 | ||
5753cba1 | 1538 | trace_rpc_bind_status(task); |
da351878 | 1539 | switch (task->tk_status) { |
381ba74a TM |
1540 | case -ENOMEM: |
1541 | dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid); | |
1542 | rpc_delay(task, HZ >> 2); | |
2429cbf6 | 1543 | goto retry_timeout; |
da351878 | 1544 | case -EACCES: |
46121cf7 CL |
1545 | dprintk("RPC: %5u remote rpcbind: RPC program/version " |
1546 | "unavailable\n", task->tk_pid); | |
b79dc8ce CL |
1547 | /* fail immediately if this is an RPC ping */ |
1548 | if (task->tk_msg.rpc_proc->p_proc == 0) { | |
1549 | status = -EOPNOTSUPP; | |
1550 | break; | |
1551 | } | |
0b760113 TM |
1552 | if (task->tk_rebind_retry == 0) |
1553 | break; | |
1554 | task->tk_rebind_retry--; | |
ea635a51 | 1555 | rpc_delay(task, 3*HZ); |
da45828e | 1556 | goto retry_timeout; |
da351878 | 1557 | case -ETIMEDOUT: |
46121cf7 | 1558 | dprintk("RPC: %5u rpcbind request timed out\n", |
da351878 | 1559 | task->tk_pid); |
da45828e | 1560 | goto retry_timeout; |
da351878 | 1561 | case -EPFNOSUPPORT: |
906462af | 1562 | /* server doesn't support any rpcbind version we know of */ |
012da158 | 1563 | dprintk("RPC: %5u unrecognized remote rpcbind service\n", |
da351878 CL |
1564 | task->tk_pid); |
1565 | break; | |
1566 | case -EPROTONOSUPPORT: | |
00a6e7bb | 1567 | dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n", |
da351878 | 1568 | task->tk_pid); |
00a6e7bb CL |
1569 | task->tk_status = 0; |
1570 | task->tk_action = call_bind; | |
1571 | return; | |
012da158 CL |
1572 | case -ECONNREFUSED: /* connection problems */ |
1573 | case -ECONNRESET: | |
1574 | case -ENOTCONN: | |
1575 | case -EHOSTDOWN: | |
1576 | case -EHOSTUNREACH: | |
1577 | case -ENETUNREACH: | |
1578 | case -EPIPE: | |
1579 | dprintk("RPC: %5u remote rpcbind unreachable: %d\n", | |
1580 | task->tk_pid, task->tk_status); | |
1581 | if (!RPC_IS_SOFTCONN(task)) { | |
1582 | rpc_delay(task, 5*HZ); | |
1583 | goto retry_timeout; | |
1584 | } | |
1585 | status = task->tk_status; | |
1586 | break; | |
da351878 | 1587 | default: |
46121cf7 | 1588 | dprintk("RPC: %5u unrecognized rpcbind error (%d)\n", |
da351878 | 1589 | task->tk_pid, -task->tk_status); |
da351878 CL |
1590 | } |
1591 | ||
1592 | rpc_exit(task, status); | |
1593 | return; | |
1594 | ||
da45828e TM |
1595 | retry_timeout: |
1596 | task->tk_action = call_timeout; | |
da351878 CL |
1597 | } |
1598 | ||
1599 | /* | |
1600 | * 4b. Connect to the RPC server | |
1da177e4 LT |
1601 | */ |
1602 | static void | |
1603 | call_connect(struct rpc_task *task) | |
1604 | { | |
da351878 | 1605 | struct rpc_xprt *xprt = task->tk_xprt; |
1da177e4 | 1606 | |
46121cf7 | 1607 | dprintk("RPC: %5u call_connect xprt %p %s connected\n", |
da351878 CL |
1608 | task->tk_pid, xprt, |
1609 | (xprt_connected(xprt) ? "is" : "is not")); | |
1da177e4 | 1610 | |
da351878 CL |
1611 | task->tk_action = call_transmit; |
1612 | if (!xprt_connected(xprt)) { | |
1613 | task->tk_action = call_connect_status; | |
1614 | if (task->tk_status < 0) | |
1615 | return; | |
1616 | xprt_connect(task); | |
1da177e4 | 1617 | } |
1da177e4 LT |
1618 | } |
1619 | ||
1620 | /* | |
da351878 | 1621 | * 4c. Sort out connect result |
1da177e4 LT |
1622 | */ |
1623 | static void | |
1624 | call_connect_status(struct rpc_task *task) | |
1625 | { | |
1626 | struct rpc_clnt *clnt = task->tk_client; | |
1627 | int status = task->tk_status; | |
1628 | ||
46121cf7 | 1629 | dprint_status(task); |
da351878 | 1630 | |
1da177e4 | 1631 | task->tk_status = 0; |
2a491991 | 1632 | if (status >= 0 || status == -EAGAIN) { |
1da177e4 LT |
1633 | clnt->cl_stats->netreconn++; |
1634 | task->tk_action = call_transmit; | |
1635 | return; | |
1636 | } | |
1637 | ||
5753cba1 | 1638 | trace_rpc_connect_status(task, status); |
1da177e4 | 1639 | switch (status) { |
da45828e TM |
1640 | /* if soft mounted, test if we've timed out */ |
1641 | case -ETIMEDOUT: | |
1642 | task->tk_action = call_timeout; | |
2a491991 TM |
1643 | break; |
1644 | default: | |
1645 | rpc_exit(task, -EIO); | |
1da177e4 LT |
1646 | } |
1647 | } | |
1648 | ||
1649 | /* | |
1650 | * 5. Transmit the RPC request, and wait for reply | |
1651 | */ | |
1652 | static void | |
1653 | call_transmit(struct rpc_task *task) | |
1654 | { | |
46121cf7 | 1655 | dprint_status(task); |
1da177e4 LT |
1656 | |
1657 | task->tk_action = call_status; | |
1658 | if (task->tk_status < 0) | |
1659 | return; | |
1660 | task->tk_status = xprt_prepare_transmit(task); | |
1661 | if (task->tk_status != 0) | |
1662 | return; | |
e0ab53de | 1663 | task->tk_action = call_transmit_status; |
1da177e4 | 1664 | /* Encode here so that rpcsec_gss can use correct sequence number. */ |
940e3318 | 1665 | if (rpc_task_need_encode(task)) { |
b0e1c57e | 1666 | rpc_xdr_encode(task); |
5e5ce5be | 1667 | /* Did the encode result in an error condition? */ |
8b39f2b4 TM |
1668 | if (task->tk_status != 0) { |
1669 | /* Was the error nonfatal? */ | |
1670 | if (task->tk_status == -EAGAIN) | |
1671 | rpc_delay(task, HZ >> 4); | |
1672 | else | |
1673 | rpc_exit(task, task->tk_status); | |
e0ab53de | 1674 | return; |
8b39f2b4 | 1675 | } |
5e5ce5be | 1676 | } |
1da177e4 LT |
1677 | xprt_transmit(task); |
1678 | if (task->tk_status < 0) | |
1679 | return; | |
e0ab53de TM |
1680 | /* |
1681 | * On success, ensure that we call xprt_end_transmit() before sleeping | |
1682 | * in order to allow access to the socket to other RPC requests. | |
1683 | */ | |
1684 | call_transmit_status(task); | |
55ae1aab | 1685 | if (rpc_reply_expected(task)) |
e0ab53de TM |
1686 | return; |
1687 | task->tk_action = rpc_exit_task; | |
fda13939 | 1688 | rpc_wake_up_queued_task(&task->tk_xprt->pending, task); |
e0ab53de TM |
1689 | } |
1690 | ||
1691 | /* | |
1692 | * 5a. Handle cleanup after a transmission | |
1693 | */ | |
1694 | static void | |
1695 | call_transmit_status(struct rpc_task *task) | |
1696 | { | |
1697 | task->tk_action = call_status; | |
206a134b CL |
1698 | |
1699 | /* | |
1700 | * Common case: success. Force the compiler to put this | |
1701 | * test first. | |
1702 | */ | |
1703 | if (task->tk_status == 0) { | |
1704 | xprt_end_transmit(task); | |
1705 | rpc_task_force_reencode(task); | |
1706 | return; | |
1707 | } | |
1708 | ||
15f081ca TM |
1709 | switch (task->tk_status) { |
1710 | case -EAGAIN: | |
1711 | break; | |
1712 | default: | |
206a134b | 1713 | dprint_status(task); |
15f081ca | 1714 | xprt_end_transmit(task); |
09a21c41 CL |
1715 | rpc_task_force_reencode(task); |
1716 | break; | |
15f081ca TM |
1717 | /* |
1718 | * Special cases: if we've been waiting on the | |
1719 | * socket's write_space() callback, or if the | |
1720 | * socket just returned a connection error, | |
1721 | * then hold onto the transport lock. | |
1722 | */ | |
1723 | case -ECONNREFUSED: | |
15f081ca TM |
1724 | case -EHOSTDOWN: |
1725 | case -EHOSTUNREACH: | |
1726 | case -ENETUNREACH: | |
09a21c41 CL |
1727 | if (RPC_IS_SOFTCONN(task)) { |
1728 | xprt_end_transmit(task); | |
1729 | rpc_exit(task, task->tk_status); | |
1730 | break; | |
1731 | } | |
1732 | case -ECONNRESET: | |
1733 | case -ENOTCONN: | |
c8485e4d | 1734 | case -EPIPE: |
15f081ca TM |
1735 | rpc_task_force_reencode(task); |
1736 | } | |
1da177e4 LT |
1737 | } |
1738 | ||
9e00abc3 | 1739 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
55ae1aab RL |
1740 | /* |
1741 | * 5b. Send the backchannel RPC reply. On error, drop the reply. In | |
1742 | * addition, disconnect on connectivity errors. | |
1743 | */ | |
1744 | static void | |
1745 | call_bc_transmit(struct rpc_task *task) | |
1746 | { | |
1747 | struct rpc_rqst *req = task->tk_rqstp; | |
1748 | ||
55ae1aab RL |
1749 | task->tk_status = xprt_prepare_transmit(task); |
1750 | if (task->tk_status == -EAGAIN) { | |
1751 | /* | |
1752 | * Could not reserve the transport. Try again after the | |
1753 | * transport is released. | |
1754 | */ | |
1755 | task->tk_status = 0; | |
1756 | task->tk_action = call_bc_transmit; | |
1757 | return; | |
1758 | } | |
1759 | ||
1760 | task->tk_action = rpc_exit_task; | |
1761 | if (task->tk_status < 0) { | |
1762 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " | |
1763 | "error: %d\n", task->tk_status); | |
1764 | return; | |
1765 | } | |
1766 | ||
1767 | xprt_transmit(task); | |
1768 | xprt_end_transmit(task); | |
1769 | dprint_status(task); | |
1770 | switch (task->tk_status) { | |
1771 | case 0: | |
1772 | /* Success */ | |
1773 | break; | |
1774 | case -EHOSTDOWN: | |
1775 | case -EHOSTUNREACH: | |
1776 | case -ENETUNREACH: | |
1777 | case -ETIMEDOUT: | |
1778 | /* | |
1779 | * Problem reaching the server. Disconnect and let the | |
1780 | * forechannel reestablish the connection. The server will | |
1781 | * have to retransmit the backchannel request and we'll | |
1782 | * reprocess it. Since these ops are idempotent, there's no | |
1783 | * need to cache our reply at this time. | |
1784 | */ | |
1785 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " | |
1786 | "error: %d\n", task->tk_status); | |
1787 | xprt_conditional_disconnect(task->tk_xprt, | |
1788 | req->rq_connect_cookie); | |
1789 | break; | |
1790 | default: | |
1791 | /* | |
1792 | * We were unable to reply and will have to drop the | |
1793 | * request. The server should reconnect and retransmit. | |
1794 | */ | |
1facf4c4 | 1795 | WARN_ON_ONCE(task->tk_status == -EAGAIN); |
55ae1aab RL |
1796 | printk(KERN_NOTICE "RPC: Could not send backchannel reply " |
1797 | "error: %d\n", task->tk_status); | |
1798 | break; | |
1799 | } | |
1800 | rpc_wake_up_queued_task(&req->rq_xprt->pending, task); | |
1801 | } | |
9e00abc3 | 1802 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
55ae1aab | 1803 | |
1da177e4 LT |
1804 | /* |
1805 | * 6. Sort out the RPC call status | |
1806 | */ | |
1807 | static void | |
1808 | call_status(struct rpc_task *task) | |
1809 | { | |
1810 | struct rpc_clnt *clnt = task->tk_client; | |
1811 | struct rpc_rqst *req = task->tk_rqstp; | |
1812 | int status; | |
1813 | ||
dd2b63d0 RL |
1814 | if (req->rq_reply_bytes_recvd > 0 && !req->rq_bytes_sent) |
1815 | task->tk_status = req->rq_reply_bytes_recvd; | |
1da177e4 | 1816 | |
46121cf7 | 1817 | dprint_status(task); |
1da177e4 LT |
1818 | |
1819 | status = task->tk_status; | |
1820 | if (status >= 0) { | |
1821 | task->tk_action = call_decode; | |
1822 | return; | |
1823 | } | |
1824 | ||
5753cba1 | 1825 | trace_rpc_call_status(task); |
1da177e4 LT |
1826 | task->tk_status = 0; |
1827 | switch(status) { | |
76303992 TM |
1828 | case -EHOSTDOWN: |
1829 | case -EHOSTUNREACH: | |
1830 | case -ENETUNREACH: | |
1831 | /* | |
1832 | * Delay any retries for 3 seconds, then handle as if it | |
1833 | * were a timeout. | |
1834 | */ | |
1835 | rpc_delay(task, 3*HZ); | |
1da177e4 LT |
1836 | case -ETIMEDOUT: |
1837 | task->tk_action = call_timeout; | |
241c39b9 | 1838 | if (task->tk_client->cl_discrtry) |
7c1d71cf TM |
1839 | xprt_conditional_disconnect(task->tk_xprt, |
1840 | req->rq_connect_cookie); | |
1da177e4 | 1841 | break; |
c8485e4d | 1842 | case -ECONNRESET: |
1da177e4 | 1843 | case -ECONNREFUSED: |
35f5a422 | 1844 | rpc_force_rebind(clnt); |
c8485e4d TM |
1845 | rpc_delay(task, 3*HZ); |
1846 | case -EPIPE: | |
1847 | case -ENOTCONN: | |
1da177e4 LT |
1848 | task->tk_action = call_bind; |
1849 | break; | |
1850 | case -EAGAIN: | |
1851 | task->tk_action = call_transmit; | |
1852 | break; | |
1853 | case -EIO: | |
1854 | /* shutdown or soft timeout */ | |
1855 | rpc_exit(task, status); | |
1856 | break; | |
1857 | default: | |
b6b6152c OK |
1858 | if (clnt->cl_chatty) |
1859 | printk("%s: RPC call returned error %d\n", | |
1da177e4 LT |
1860 | clnt->cl_protname, -status); |
1861 | rpc_exit(task, status); | |
1da177e4 LT |
1862 | } |
1863 | } | |
1864 | ||
1865 | /* | |
e0ab53de | 1866 | * 6a. Handle RPC timeout |
1da177e4 LT |
1867 | * We do not release the request slot, so we keep using the |
1868 | * same XID for all retransmits. | |
1869 | */ | |
1870 | static void | |
1871 | call_timeout(struct rpc_task *task) | |
1872 | { | |
1873 | struct rpc_clnt *clnt = task->tk_client; | |
1874 | ||
1875 | if (xprt_adjust_timeout(task->tk_rqstp) == 0) { | |
46121cf7 | 1876 | dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid); |
1da177e4 LT |
1877 | goto retry; |
1878 | } | |
1879 | ||
46121cf7 | 1880 | dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid); |
ef759a2e CL |
1881 | task->tk_timeouts++; |
1882 | ||
3a28becc CL |
1883 | if (RPC_IS_SOFTCONN(task)) { |
1884 | rpc_exit(task, -ETIMEDOUT); | |
1885 | return; | |
1886 | } | |
1da177e4 | 1887 | if (RPC_IS_SOFT(task)) { |
cac5d07e | 1888 | if (clnt->cl_chatty) { |
4e0038b6 | 1889 | rcu_read_lock(); |
b6b6152c | 1890 | printk(KERN_NOTICE "%s: server %s not responding, timed out\n", |
4e0038b6 TM |
1891 | clnt->cl_protname, |
1892 | rcu_dereference(clnt->cl_xprt)->servername); | |
1893 | rcu_read_unlock(); | |
cac5d07e | 1894 | } |
7494d00c TM |
1895 | if (task->tk_flags & RPC_TASK_TIMEOUT) |
1896 | rpc_exit(task, -ETIMEDOUT); | |
1897 | else | |
1898 | rpc_exit(task, -EIO); | |
1da177e4 LT |
1899 | return; |
1900 | } | |
1901 | ||
f518e35a | 1902 | if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) { |
1da177e4 | 1903 | task->tk_flags |= RPC_CALL_MAJORSEEN; |
4e0038b6 TM |
1904 | if (clnt->cl_chatty) { |
1905 | rcu_read_lock(); | |
b6b6152c | 1906 | printk(KERN_NOTICE "%s: server %s not responding, still trying\n", |
4e0038b6 TM |
1907 | clnt->cl_protname, |
1908 | rcu_dereference(clnt->cl_xprt)->servername); | |
1909 | rcu_read_unlock(); | |
1910 | } | |
1da177e4 | 1911 | } |
35f5a422 | 1912 | rpc_force_rebind(clnt); |
b48633bd TM |
1913 | /* |
1914 | * Did our request time out due to an RPCSEC_GSS out-of-sequence | |
1915 | * event? RFC2203 requires the server to drop all such requests. | |
1916 | */ | |
1917 | rpcauth_invalcred(task); | |
1da177e4 LT |
1918 | |
1919 | retry: | |
1920 | clnt->cl_stats->rpcretrans++; | |
1921 | task->tk_action = call_bind; | |
1922 | task->tk_status = 0; | |
1923 | } | |
1924 | ||
1925 | /* | |
1926 | * 7. Decode the RPC reply | |
1927 | */ | |
1928 | static void | |
1929 | call_decode(struct rpc_task *task) | |
1930 | { | |
1931 | struct rpc_clnt *clnt = task->tk_client; | |
1932 | struct rpc_rqst *req = task->tk_rqstp; | |
bf269551 | 1933 | kxdrdproc_t decode = task->tk_msg.rpc_proc->p_decode; |
d8ed029d | 1934 | __be32 *p; |
1da177e4 | 1935 | |
726fd6ad | 1936 | dprint_status(task); |
1da177e4 | 1937 | |
f518e35a | 1938 | if (task->tk_flags & RPC_CALL_MAJORSEEN) { |
4e0038b6 TM |
1939 | if (clnt->cl_chatty) { |
1940 | rcu_read_lock(); | |
b6b6152c | 1941 | printk(KERN_NOTICE "%s: server %s OK\n", |
4e0038b6 TM |
1942 | clnt->cl_protname, |
1943 | rcu_dereference(clnt->cl_xprt)->servername); | |
1944 | rcu_read_unlock(); | |
1945 | } | |
1da177e4 LT |
1946 | task->tk_flags &= ~RPC_CALL_MAJORSEEN; |
1947 | } | |
1948 | ||
43ac3f29 TM |
1949 | /* |
1950 | * Ensure that we see all writes made by xprt_complete_rqst() | |
dd2b63d0 | 1951 | * before it changed req->rq_reply_bytes_recvd. |
43ac3f29 TM |
1952 | */ |
1953 | smp_rmb(); | |
1da177e4 LT |
1954 | req->rq_rcv_buf.len = req->rq_private_buf.len; |
1955 | ||
1956 | /* Check that the softirq receive buffer is valid */ | |
1957 | WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf, | |
1958 | sizeof(req->rq_rcv_buf)) != 0); | |
1959 | ||
1e799b67 TM |
1960 | if (req->rq_rcv_buf.len < 12) { |
1961 | if (!RPC_IS_SOFT(task)) { | |
1962 | task->tk_action = call_bind; | |
1963 | clnt->cl_stats->rpcretrans++; | |
1964 | goto out_retry; | |
1965 | } | |
1966 | dprintk("RPC: %s: too small RPC reply size (%d bytes)\n", | |
1967 | clnt->cl_protname, task->tk_status); | |
1968 | task->tk_action = call_timeout; | |
1969 | goto out_retry; | |
1970 | } | |
1971 | ||
b0e1c57e | 1972 | p = rpc_verify_header(task); |
abbcf28f TM |
1973 | if (IS_ERR(p)) { |
1974 | if (p == ERR_PTR(-EAGAIN)) | |
1975 | goto out_retry; | |
1976 | return; | |
1da177e4 LT |
1977 | } |
1978 | ||
abbcf28f | 1979 | task->tk_action = rpc_exit_task; |
1da177e4 | 1980 | |
6d5fcb5a | 1981 | if (decode) { |
1da177e4 LT |
1982 | task->tk_status = rpcauth_unwrap_resp(task, decode, req, p, |
1983 | task->tk_msg.rpc_resp); | |
6d5fcb5a | 1984 | } |
46121cf7 CL |
1985 | dprintk("RPC: %5u call_decode result %d\n", task->tk_pid, |
1986 | task->tk_status); | |
1da177e4 LT |
1987 | return; |
1988 | out_retry: | |
1da177e4 | 1989 | task->tk_status = 0; |
b0e1c57e | 1990 | /* Note: rpc_verify_header() may have freed the RPC slot */ |
24b74bf0 | 1991 | if (task->tk_rqstp == req) { |
dd2b63d0 | 1992 | req->rq_reply_bytes_recvd = req->rq_rcv_buf.len = 0; |
24b74bf0 | 1993 | if (task->tk_client->cl_discrtry) |
7c1d71cf TM |
1994 | xprt_conditional_disconnect(task->tk_xprt, |
1995 | req->rq_connect_cookie); | |
24b74bf0 | 1996 | } |
1da177e4 LT |
1997 | } |
1998 | ||
d8ed029d | 1999 | static __be32 * |
b0e1c57e | 2000 | rpc_encode_header(struct rpc_task *task) |
1da177e4 LT |
2001 | { |
2002 | struct rpc_clnt *clnt = task->tk_client; | |
1da177e4 | 2003 | struct rpc_rqst *req = task->tk_rqstp; |
d8ed029d | 2004 | __be32 *p = req->rq_svec[0].iov_base; |
1da177e4 LT |
2005 | |
2006 | /* FIXME: check buffer size? */ | |
808012fb CL |
2007 | |
2008 | p = xprt_skip_transport_header(task->tk_xprt, p); | |
1da177e4 LT |
2009 | *p++ = req->rq_xid; /* XID */ |
2010 | *p++ = htonl(RPC_CALL); /* CALL */ | |
2011 | *p++ = htonl(RPC_VERSION); /* RPC version */ | |
2012 | *p++ = htonl(clnt->cl_prog); /* program number */ | |
2013 | *p++ = htonl(clnt->cl_vers); /* program version */ | |
2014 | *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */ | |
334ccfd5 TM |
2015 | p = rpcauth_marshcred(task, p); |
2016 | req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p); | |
2017 | return p; | |
1da177e4 LT |
2018 | } |
2019 | ||
d8ed029d | 2020 | static __be32 * |
b0e1c57e | 2021 | rpc_verify_header(struct rpc_task *task) |
1da177e4 | 2022 | { |
4e0038b6 | 2023 | struct rpc_clnt *clnt = task->tk_client; |
1da177e4 LT |
2024 | struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0]; |
2025 | int len = task->tk_rqstp->rq_rcv_buf.len >> 2; | |
d8ed029d AD |
2026 | __be32 *p = iov->iov_base; |
2027 | u32 n; | |
1da177e4 LT |
2028 | int error = -EACCES; |
2029 | ||
e8896495 DH |
2030 | if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) { |
2031 | /* RFC-1014 says that the representation of XDR data must be a | |
2032 | * multiple of four bytes | |
2033 | * - if it isn't pointer subtraction in the NFS client may give | |
2034 | * undefined results | |
2035 | */ | |
8a702bbb | 2036 | dprintk("RPC: %5u %s: XDR representation not a multiple of" |
0dc47877 | 2037 | " 4 bytes: 0x%x\n", task->tk_pid, __func__, |
8a702bbb | 2038 | task->tk_rqstp->rq_rcv_buf.len); |
e8896495 DH |
2039 | goto out_eio; |
2040 | } | |
1da177e4 LT |
2041 | if ((len -= 3) < 0) |
2042 | goto out_overflow; | |
1da177e4 | 2043 | |
f4a2e418 | 2044 | p += 1; /* skip XID */ |
1da177e4 | 2045 | if ((n = ntohl(*p++)) != RPC_REPLY) { |
8a702bbb | 2046 | dprintk("RPC: %5u %s: not an RPC reply: %x\n", |
f4a2e418 | 2047 | task->tk_pid, __func__, n); |
abbcf28f | 2048 | goto out_garbage; |
1da177e4 | 2049 | } |
f4a2e418 | 2050 | |
1da177e4 LT |
2051 | if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) { |
2052 | if (--len < 0) | |
2053 | goto out_overflow; | |
2054 | switch ((n = ntohl(*p++))) { | |
89f0e4fe JP |
2055 | case RPC_AUTH_ERROR: |
2056 | break; | |
2057 | case RPC_MISMATCH: | |
2058 | dprintk("RPC: %5u %s: RPC call version mismatch!\n", | |
2059 | task->tk_pid, __func__); | |
2060 | error = -EPROTONOSUPPORT; | |
2061 | goto out_err; | |
2062 | default: | |
2063 | dprintk("RPC: %5u %s: RPC call rejected, " | |
2064 | "unknown error: %x\n", | |
2065 | task->tk_pid, __func__, n); | |
2066 | goto out_eio; | |
1da177e4 LT |
2067 | } |
2068 | if (--len < 0) | |
2069 | goto out_overflow; | |
2070 | switch ((n = ntohl(*p++))) { | |
2071 | case RPC_AUTH_REJECTEDCRED: | |
2072 | case RPC_AUTH_REJECTEDVERF: | |
2073 | case RPCSEC_GSS_CREDPROBLEM: | |
2074 | case RPCSEC_GSS_CTXPROBLEM: | |
2075 | if (!task->tk_cred_retry) | |
2076 | break; | |
2077 | task->tk_cred_retry--; | |
46121cf7 | 2078 | dprintk("RPC: %5u %s: retry stale creds\n", |
0dc47877 | 2079 | task->tk_pid, __func__); |
1da177e4 | 2080 | rpcauth_invalcred(task); |
220bcc2a TM |
2081 | /* Ensure we obtain a new XID! */ |
2082 | xprt_release(task); | |
118df3d1 | 2083 | task->tk_action = call_reserve; |
abbcf28f | 2084 | goto out_retry; |
1da177e4 LT |
2085 | case RPC_AUTH_BADCRED: |
2086 | case RPC_AUTH_BADVERF: | |
2087 | /* possibly garbled cred/verf? */ | |
2088 | if (!task->tk_garb_retry) | |
2089 | break; | |
2090 | task->tk_garb_retry--; | |
46121cf7 | 2091 | dprintk("RPC: %5u %s: retry garbled creds\n", |
0dc47877 | 2092 | task->tk_pid, __func__); |
1da177e4 | 2093 | task->tk_action = call_bind; |
abbcf28f | 2094 | goto out_retry; |
1da177e4 | 2095 | case RPC_AUTH_TOOWEAK: |
4e0038b6 | 2096 | rcu_read_lock(); |
b0e1c57e | 2097 | printk(KERN_NOTICE "RPC: server %s requires stronger " |
4e0038b6 TM |
2098 | "authentication.\n", |
2099 | rcu_dereference(clnt->cl_xprt)->servername); | |
2100 | rcu_read_unlock(); | |
1da177e4 LT |
2101 | break; |
2102 | default: | |
8a702bbb | 2103 | dprintk("RPC: %5u %s: unknown auth error: %x\n", |
0dc47877 | 2104 | task->tk_pid, __func__, n); |
1da177e4 LT |
2105 | error = -EIO; |
2106 | } | |
46121cf7 | 2107 | dprintk("RPC: %5u %s: call rejected %d\n", |
0dc47877 | 2108 | task->tk_pid, __func__, n); |
1da177e4 LT |
2109 | goto out_err; |
2110 | } | |
2111 | if (!(p = rpcauth_checkverf(task, p))) { | |
8a702bbb | 2112 | dprintk("RPC: %5u %s: auth check failed\n", |
0dc47877 | 2113 | task->tk_pid, __func__); |
abbcf28f | 2114 | goto out_garbage; /* bad verifier, retry */ |
1da177e4 | 2115 | } |
d8ed029d | 2116 | len = p - (__be32 *)iov->iov_base - 1; |
1da177e4 LT |
2117 | if (len < 0) |
2118 | goto out_overflow; | |
2119 | switch ((n = ntohl(*p++))) { | |
2120 | case RPC_SUCCESS: | |
2121 | return p; | |
2122 | case RPC_PROG_UNAVAIL: | |
4e0038b6 TM |
2123 | dprintk_rcu("RPC: %5u %s: program %u is unsupported " |
2124 | "by server %s\n", task->tk_pid, __func__, | |
2125 | (unsigned int)clnt->cl_prog, | |
2126 | rcu_dereference(clnt->cl_xprt)->servername); | |
cdf47706 AG |
2127 | error = -EPFNOSUPPORT; |
2128 | goto out_err; | |
1da177e4 | 2129 | case RPC_PROG_MISMATCH: |
4e0038b6 TM |
2130 | dprintk_rcu("RPC: %5u %s: program %u, version %u unsupported " |
2131 | "by server %s\n", task->tk_pid, __func__, | |
2132 | (unsigned int)clnt->cl_prog, | |
2133 | (unsigned int)clnt->cl_vers, | |
2134 | rcu_dereference(clnt->cl_xprt)->servername); | |
cdf47706 AG |
2135 | error = -EPROTONOSUPPORT; |
2136 | goto out_err; | |
1da177e4 | 2137 | case RPC_PROC_UNAVAIL: |
4e0038b6 | 2138 | dprintk_rcu("RPC: %5u %s: proc %s unsupported by program %u, " |
46121cf7 | 2139 | "version %u on server %s\n", |
0dc47877 | 2140 | task->tk_pid, __func__, |
3748f1e4 | 2141 | rpc_proc_name(task), |
4e0038b6 TM |
2142 | clnt->cl_prog, clnt->cl_vers, |
2143 | rcu_dereference(clnt->cl_xprt)->servername); | |
cdf47706 AG |
2144 | error = -EOPNOTSUPP; |
2145 | goto out_err; | |
1da177e4 | 2146 | case RPC_GARBAGE_ARGS: |
46121cf7 | 2147 | dprintk("RPC: %5u %s: server saw garbage\n", |
0dc47877 | 2148 | task->tk_pid, __func__); |
1da177e4 LT |
2149 | break; /* retry */ |
2150 | default: | |
8a702bbb | 2151 | dprintk("RPC: %5u %s: server accept status: %x\n", |
0dc47877 | 2152 | task->tk_pid, __func__, n); |
1da177e4 LT |
2153 | /* Also retry */ |
2154 | } | |
2155 | ||
abbcf28f | 2156 | out_garbage: |
4e0038b6 | 2157 | clnt->cl_stats->rpcgarbage++; |
1da177e4 LT |
2158 | if (task->tk_garb_retry) { |
2159 | task->tk_garb_retry--; | |
46121cf7 | 2160 | dprintk("RPC: %5u %s: retrying\n", |
0dc47877 | 2161 | task->tk_pid, __func__); |
1da177e4 | 2162 | task->tk_action = call_bind; |
abbcf28f TM |
2163 | out_retry: |
2164 | return ERR_PTR(-EAGAIN); | |
1da177e4 | 2165 | } |
1da177e4 LT |
2166 | out_eio: |
2167 | error = -EIO; | |
2168 | out_err: | |
2169 | rpc_exit(task, error); | |
8a702bbb | 2170 | dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid, |
0dc47877 | 2171 | __func__, error); |
abbcf28f | 2172 | return ERR_PTR(error); |
1da177e4 | 2173 | out_overflow: |
8a702bbb | 2174 | dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid, |
0dc47877 | 2175 | __func__); |
abbcf28f | 2176 | goto out_garbage; |
1da177e4 | 2177 | } |
5ee0ed7d | 2178 | |
9f06c719 | 2179 | static void rpcproc_encode_null(void *rqstp, struct xdr_stream *xdr, void *obj) |
5ee0ed7d | 2180 | { |
5ee0ed7d TM |
2181 | } |
2182 | ||
bf269551 | 2183 | static int rpcproc_decode_null(void *rqstp, struct xdr_stream *xdr, void *obj) |
5ee0ed7d TM |
2184 | { |
2185 | return 0; | |
2186 | } | |
2187 | ||
2188 | static struct rpc_procinfo rpcproc_null = { | |
2189 | .p_encode = rpcproc_encode_null, | |
2190 | .p_decode = rpcproc_decode_null, | |
2191 | }; | |
2192 | ||
caabea8a | 2193 | static int rpc_ping(struct rpc_clnt *clnt) |
5ee0ed7d TM |
2194 | { |
2195 | struct rpc_message msg = { | |
2196 | .rpc_proc = &rpcproc_null, | |
2197 | }; | |
2198 | int err; | |
2199 | msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0); | |
caabea8a | 2200 | err = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN); |
5ee0ed7d TM |
2201 | put_rpccred(msg.rpc_cred); |
2202 | return err; | |
2203 | } | |
188fef11 | 2204 | |
5e1550d6 TM |
2205 | struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags) |
2206 | { | |
2207 | struct rpc_message msg = { | |
2208 | .rpc_proc = &rpcproc_null, | |
2209 | .rpc_cred = cred, | |
2210 | }; | |
84115e1c TM |
2211 | struct rpc_task_setup task_setup_data = { |
2212 | .rpc_client = clnt, | |
2213 | .rpc_message = &msg, | |
2214 | .callback_ops = &rpc_default_ops, | |
2215 | .flags = flags, | |
2216 | }; | |
c970aa85 | 2217 | return rpc_run_task(&task_setup_data); |
5e1550d6 | 2218 | } |
e8914c65 | 2219 | EXPORT_SYMBOL_GPL(rpc_call_null); |
5e1550d6 | 2220 | |
188fef11 | 2221 | #ifdef RPC_DEBUG |
68a23ee9 CL |
2222 | static void rpc_show_header(void) |
2223 | { | |
cb3997b5 CL |
2224 | printk(KERN_INFO "-pid- flgs status -client- --rqstp- " |
2225 | "-timeout ---ops--\n"); | |
68a23ee9 CL |
2226 | } |
2227 | ||
38e886e0 CL |
2228 | static void rpc_show_task(const struct rpc_clnt *clnt, |
2229 | const struct rpc_task *task) | |
2230 | { | |
2231 | const char *rpc_waitq = "none"; | |
38e886e0 CL |
2232 | |
2233 | if (RPC_IS_QUEUED(task)) | |
2234 | rpc_waitq = rpc_qname(task->tk_waitqueue); | |
2235 | ||
b3bcedad | 2236 | printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%ps q:%s\n", |
cb3997b5 CL |
2237 | task->tk_pid, task->tk_flags, task->tk_status, |
2238 | clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops, | |
2239 | clnt->cl_protname, clnt->cl_vers, rpc_proc_name(task), | |
b3bcedad | 2240 | task->tk_action, rpc_waitq); |
38e886e0 CL |
2241 | } |
2242 | ||
70abc49b | 2243 | void rpc_show_tasks(struct net *net) |
188fef11 TM |
2244 | { |
2245 | struct rpc_clnt *clnt; | |
38e886e0 | 2246 | struct rpc_task *task; |
68a23ee9 | 2247 | int header = 0; |
70abc49b | 2248 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
188fef11 | 2249 | |
70abc49b SK |
2250 | spin_lock(&sn->rpc_client_lock); |
2251 | list_for_each_entry(clnt, &sn->all_clients, cl_clients) { | |
188fef11 | 2252 | spin_lock(&clnt->cl_lock); |
38e886e0 | 2253 | list_for_each_entry(task, &clnt->cl_tasks, tk_task) { |
68a23ee9 CL |
2254 | if (!header) { |
2255 | rpc_show_header(); | |
2256 | header++; | |
2257 | } | |
38e886e0 | 2258 | rpc_show_task(clnt, task); |
188fef11 TM |
2259 | } |
2260 | spin_unlock(&clnt->cl_lock); | |
2261 | } | |
70abc49b | 2262 | spin_unlock(&sn->rpc_client_lock); |
188fef11 TM |
2263 | } |
2264 | #endif |