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