1 /* 2 * In-kernel rpcbind client supporting versions 2, 3, and 4 of the rpcbind 3 * protocol 4 * 5 * Based on RFC 1833: "Binding Protocols for ONC RPC Version 2" and 6 * RFC 3530: "Network File System (NFS) version 4 Protocol" 7 * 8 * Original: Gilles Quillard, Bull Open Source, 2005 <gilles.quillard@bull.net> 9 * Updated: Chuck Lever, Oracle Corporation, 2007 <chuck.lever@oracle.com> 10 * 11 * Descended from net/sunrpc/pmap_clnt.c, 12 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de> 13 */ 14 15 #include <linux/module.h> 16 17 #include <linux/types.h> 18 #include <linux/socket.h> 19 #include <linux/in.h> 20 #include <linux/in6.h> 21 #include <linux/kernel.h> 22 #include <linux/errno.h> 23 #include <linux/mutex.h> 24 #include <net/ipv6.h> 25 26 #include <linux/sunrpc/clnt.h> 27 #include <linux/sunrpc/sched.h> 28 #include <linux/sunrpc/xprtsock.h> 29 30 #ifdef RPC_DEBUG 31 # define RPCDBG_FACILITY RPCDBG_BIND 32 #endif 33 34 #define RPCBIND_PROGRAM (100000u) 35 #define RPCBIND_PORT (111u) 36 37 #define RPCBVERS_2 (2u) 38 #define RPCBVERS_3 (3u) 39 #define RPCBVERS_4 (4u) 40 41 enum { 42 RPCBPROC_NULL, 43 RPCBPROC_SET, 44 RPCBPROC_UNSET, 45 RPCBPROC_GETPORT, 46 RPCBPROC_GETADDR = 3, /* alias for GETPORT */ 47 RPCBPROC_DUMP, 48 RPCBPROC_CALLIT, 49 RPCBPROC_BCAST = 5, /* alias for CALLIT */ 50 RPCBPROC_GETTIME, 51 RPCBPROC_UADDR2TADDR, 52 RPCBPROC_TADDR2UADDR, 53 RPCBPROC_GETVERSADDR, 54 RPCBPROC_INDIRECT, 55 RPCBPROC_GETADDRLIST, 56 RPCBPROC_GETSTAT, 57 }; 58 59 #define RPCB_HIGHPROC_2 RPCBPROC_CALLIT 60 #define RPCB_HIGHPROC_3 RPCBPROC_TADDR2UADDR 61 #define RPCB_HIGHPROC_4 RPCBPROC_GETSTAT 62 63 /* 64 * r_owner 65 * 66 * The "owner" is allowed to unset a service in the rpcbind database. 67 * 68 * For AF_LOCAL SET/UNSET requests, rpcbind treats this string as a 69 * UID which it maps to a local user name via a password lookup. 70 * In all other cases it is ignored. 71 * 72 * For SET/UNSET requests, user space provides a value, even for 73 * network requests, and GETADDR uses an empty string. We follow 74 * those precedents here. 75 */ 76 #define RPCB_OWNER_STRING "0" 77 #define RPCB_MAXOWNERLEN sizeof(RPCB_OWNER_STRING) 78 79 /* 80 * XDR data type sizes 81 */ 82 #define RPCB_program_sz (1) 83 #define RPCB_version_sz (1) 84 #define RPCB_protocol_sz (1) 85 #define RPCB_port_sz (1) 86 #define RPCB_boolean_sz (1) 87 88 #define RPCB_netid_sz (1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN)) 89 #define RPCB_addr_sz (1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN)) 90 #define RPCB_ownerstring_sz (1 + XDR_QUADLEN(RPCB_MAXOWNERLEN)) 91 92 /* 93 * XDR argument and result sizes 94 */ 95 #define RPCB_mappingargs_sz (RPCB_program_sz + RPCB_version_sz + \ 96 RPCB_protocol_sz + RPCB_port_sz) 97 #define RPCB_getaddrargs_sz (RPCB_program_sz + RPCB_version_sz + \ 98 RPCB_netid_sz + RPCB_addr_sz + \ 99 RPCB_ownerstring_sz) 100 101 #define RPCB_getportres_sz RPCB_port_sz 102 #define RPCB_setres_sz RPCB_boolean_sz 103 104 /* 105 * Note that RFC 1833 does not put any size restrictions on the 106 * address string returned by the remote rpcbind database. 107 */ 108 #define RPCB_getaddrres_sz RPCB_addr_sz 109 110 static void rpcb_getport_done(struct rpc_task *, void *); 111 static void rpcb_map_release(void *data); 112 static struct rpc_program rpcb_program; 113 114 static struct rpc_clnt * rpcb_local_clnt; 115 static struct rpc_clnt * rpcb_local_clnt4; 116 117 struct rpcbind_args { 118 struct rpc_xprt * r_xprt; 119 120 u32 r_prog; 121 u32 r_vers; 122 u32 r_prot; 123 unsigned short r_port; 124 const char * r_netid; 125 const char * r_addr; 126 const char * r_owner; 127 128 int r_status; 129 }; 130 131 static struct rpc_procinfo rpcb_procedures2[]; 132 static struct rpc_procinfo rpcb_procedures3[]; 133 static struct rpc_procinfo rpcb_procedures4[]; 134 135 struct rpcb_info { 136 u32 rpc_vers; 137 struct rpc_procinfo * rpc_proc; 138 }; 139 140 static struct rpcb_info rpcb_next_version[]; 141 static struct rpcb_info rpcb_next_version6[]; 142 143 static const struct rpc_call_ops rpcb_getport_ops = { 144 .rpc_call_done = rpcb_getport_done, 145 .rpc_release = rpcb_map_release, 146 }; 147 148 static void rpcb_wake_rpcbind_waiters(struct rpc_xprt *xprt, int status) 149 { 150 xprt_clear_binding(xprt); 151 rpc_wake_up_status(&xprt->binding, status); 152 } 153 154 static void rpcb_map_release(void *data) 155 { 156 struct rpcbind_args *map = data; 157 158 rpcb_wake_rpcbind_waiters(map->r_xprt, map->r_status); 159 xprt_put(map->r_xprt); 160 kfree(map->r_addr); 161 kfree(map); 162 } 163 164 static const struct sockaddr_in rpcb_inaddr_loopback = { 165 .sin_family = AF_INET, 166 .sin_addr.s_addr = htonl(INADDR_LOOPBACK), 167 .sin_port = htons(RPCBIND_PORT), 168 }; 169 170 static DEFINE_MUTEX(rpcb_create_local_mutex); 171 172 /* 173 * Returns zero on success, otherwise a negative errno value 174 * is returned. 175 */ 176 static int rpcb_create_local(void) 177 { 178 struct rpc_create_args args = { 179 .protocol = XPRT_TRANSPORT_TCP, 180 .address = (struct sockaddr *)&rpcb_inaddr_loopback, 181 .addrsize = sizeof(rpcb_inaddr_loopback), 182 .servername = "localhost", 183 .program = &rpcb_program, 184 .version = RPCBVERS_2, 185 .authflavor = RPC_AUTH_UNIX, 186 .flags = RPC_CLNT_CREATE_NOPING, 187 }; 188 struct rpc_clnt *clnt, *clnt4; 189 int result = 0; 190 191 if (rpcb_local_clnt) 192 return result; 193 194 mutex_lock(&rpcb_create_local_mutex); 195 if (rpcb_local_clnt) 196 goto out; 197 198 clnt = rpc_create(&args); 199 if (IS_ERR(clnt)) { 200 dprintk("RPC: failed to create local rpcbind " 201 "client (errno %ld).\n", PTR_ERR(clnt)); 202 result = -PTR_ERR(clnt); 203 goto out; 204 } 205 206 /* 207 * This results in an RPC ping. On systems running portmapper, 208 * the v4 ping will fail. Proceed anyway, but disallow rpcb 209 * v4 upcalls. 210 */ 211 clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4); 212 if (IS_ERR(clnt4)) { 213 dprintk("RPC: failed to create local rpcbind v4 " 214 "cleint (errno %ld).\n", PTR_ERR(clnt4)); 215 clnt4 = NULL; 216 } 217 218 rpcb_local_clnt = clnt; 219 rpcb_local_clnt4 = clnt4; 220 221 out: 222 mutex_unlock(&rpcb_create_local_mutex); 223 return result; 224 } 225 226 static struct rpc_clnt *rpcb_create(char *hostname, struct sockaddr *srvaddr, 227 size_t salen, int proto, u32 version) 228 { 229 struct rpc_create_args args = { 230 .protocol = proto, 231 .address = srvaddr, 232 .addrsize = salen, 233 .servername = hostname, 234 .program = &rpcb_program, 235 .version = version, 236 .authflavor = RPC_AUTH_UNIX, 237 .flags = (RPC_CLNT_CREATE_NOPING | 238 RPC_CLNT_CREATE_NONPRIVPORT), 239 }; 240 241 switch (srvaddr->sa_family) { 242 case AF_INET: 243 ((struct sockaddr_in *)srvaddr)->sin_port = htons(RPCBIND_PORT); 244 break; 245 case AF_INET6: 246 ((struct sockaddr_in6 *)srvaddr)->sin6_port = htons(RPCBIND_PORT); 247 break; 248 default: 249 return NULL; 250 } 251 252 return rpc_create(&args); 253 } 254 255 static int rpcb_register_call(struct rpc_clnt *clnt, struct rpc_message *msg) 256 { 257 int result, error = 0; 258 259 msg->rpc_resp = &result; 260 261 error = rpc_call_sync(clnt, msg, RPC_TASK_SOFTCONN); 262 if (error < 0) { 263 dprintk("RPC: failed to contact local rpcbind " 264 "server (errno %d).\n", -error); 265 return error; 266 } 267 268 if (!result) 269 return -EACCES; 270 return 0; 271 } 272 273 /** 274 * rpcb_register - set or unset a port registration with the local rpcbind svc 275 * @prog: RPC program number to bind 276 * @vers: RPC version number to bind 277 * @prot: transport protocol to register 278 * @port: port value to register 279 * 280 * Returns zero if the registration request was dispatched successfully 281 * and the rpcbind daemon returned success. Otherwise, returns an errno 282 * value that reflects the nature of the error (request could not be 283 * dispatched, timed out, or rpcbind returned an error). 284 * 285 * RPC services invoke this function to advertise their contact 286 * information via the system's rpcbind daemon. RPC services 287 * invoke this function once for each [program, version, transport] 288 * tuple they wish to advertise. 289 * 290 * Callers may also unregister RPC services that are no longer 291 * available by setting the passed-in port to zero. This removes 292 * all registered transports for [program, version] from the local 293 * rpcbind database. 294 * 295 * This function uses rpcbind protocol version 2 to contact the 296 * local rpcbind daemon. 297 * 298 * Registration works over both AF_INET and AF_INET6, and services 299 * registered via this function are advertised as available for any 300 * address. If the local rpcbind daemon is listening on AF_INET6, 301 * services registered via this function will be advertised on 302 * IN6ADDR_ANY (ie available for all AF_INET and AF_INET6 303 * addresses). 304 */ 305 int rpcb_register(u32 prog, u32 vers, int prot, unsigned short port) 306 { 307 struct rpcbind_args map = { 308 .r_prog = prog, 309 .r_vers = vers, 310 .r_prot = prot, 311 .r_port = port, 312 }; 313 struct rpc_message msg = { 314 .rpc_argp = &map, 315 }; 316 int error; 317 318 error = rpcb_create_local(); 319 if (error) 320 return error; 321 322 dprintk("RPC: %sregistering (%u, %u, %d, %u) with local " 323 "rpcbind\n", (port ? "" : "un"), 324 prog, vers, prot, port); 325 326 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_UNSET]; 327 if (port) 328 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_SET]; 329 330 return rpcb_register_call(rpcb_local_clnt, &msg); 331 } 332 333 /* 334 * Fill in AF_INET family-specific arguments to register 335 */ 336 static int rpcb_register_inet4(const struct sockaddr *sap, 337 struct rpc_message *msg) 338 { 339 const struct sockaddr_in *sin = (const struct sockaddr_in *)sap; 340 struct rpcbind_args *map = msg->rpc_argp; 341 unsigned short port = ntohs(sin->sin_port); 342 int result; 343 344 map->r_addr = rpc_sockaddr2uaddr(sap); 345 346 dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with " 347 "local rpcbind\n", (port ? "" : "un"), 348 map->r_prog, map->r_vers, 349 map->r_addr, map->r_netid); 350 351 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET]; 352 if (port) 353 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET]; 354 355 result = rpcb_register_call(rpcb_local_clnt4, msg); 356 kfree(map->r_addr); 357 return result; 358 } 359 360 /* 361 * Fill in AF_INET6 family-specific arguments to register 362 */ 363 static int rpcb_register_inet6(const struct sockaddr *sap, 364 struct rpc_message *msg) 365 { 366 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sap; 367 struct rpcbind_args *map = msg->rpc_argp; 368 unsigned short port = ntohs(sin6->sin6_port); 369 int result; 370 371 map->r_addr = rpc_sockaddr2uaddr(sap); 372 373 dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with " 374 "local rpcbind\n", (port ? "" : "un"), 375 map->r_prog, map->r_vers, 376 map->r_addr, map->r_netid); 377 378 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET]; 379 if (port) 380 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET]; 381 382 result = rpcb_register_call(rpcb_local_clnt4, msg); 383 kfree(map->r_addr); 384 return result; 385 } 386 387 static int rpcb_unregister_all_protofamilies(struct rpc_message *msg) 388 { 389 struct rpcbind_args *map = msg->rpc_argp; 390 391 dprintk("RPC: unregistering [%u, %u, '%s'] with " 392 "local rpcbind\n", 393 map->r_prog, map->r_vers, map->r_netid); 394 395 map->r_addr = ""; 396 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET]; 397 398 return rpcb_register_call(rpcb_local_clnt4, msg); 399 } 400 401 /** 402 * rpcb_v4_register - set or unset a port registration with the local rpcbind 403 * @program: RPC program number of service to (un)register 404 * @version: RPC version number of service to (un)register 405 * @address: address family, IP address, and port to (un)register 406 * @netid: netid of transport protocol to (un)register 407 * 408 * Returns zero if the registration request was dispatched successfully 409 * and the rpcbind daemon returned success. Otherwise, returns an errno 410 * value that reflects the nature of the error (request could not be 411 * dispatched, timed out, or rpcbind returned an error). 412 * 413 * RPC services invoke this function to advertise their contact 414 * information via the system's rpcbind daemon. RPC services 415 * invoke this function once for each [program, version, address, 416 * netid] tuple they wish to advertise. 417 * 418 * Callers may also unregister RPC services that are registered at a 419 * specific address by setting the port number in @address to zero. 420 * They may unregister all registered protocol families at once for 421 * a service by passing a NULL @address argument. If @netid is "" 422 * then all netids for [program, version, address] are unregistered. 423 * 424 * This function uses rpcbind protocol version 4 to contact the 425 * local rpcbind daemon. The local rpcbind daemon must support 426 * version 4 of the rpcbind protocol in order for these functions 427 * to register a service successfully. 428 * 429 * Supported netids include "udp" and "tcp" for UDP and TCP over 430 * IPv4, and "udp6" and "tcp6" for UDP and TCP over IPv6, 431 * respectively. 432 * 433 * The contents of @address determine the address family and the 434 * port to be registered. The usual practice is to pass INADDR_ANY 435 * as the raw address, but specifying a non-zero address is also 436 * supported by this API if the caller wishes to advertise an RPC 437 * service on a specific network interface. 438 * 439 * Note that passing in INADDR_ANY does not create the same service 440 * registration as IN6ADDR_ANY. The former advertises an RPC 441 * service on any IPv4 address, but not on IPv6. The latter 442 * advertises the service on all IPv4 and IPv6 addresses. 443 */ 444 int rpcb_v4_register(const u32 program, const u32 version, 445 const struct sockaddr *address, const char *netid) 446 { 447 struct rpcbind_args map = { 448 .r_prog = program, 449 .r_vers = version, 450 .r_netid = netid, 451 .r_owner = RPCB_OWNER_STRING, 452 }; 453 struct rpc_message msg = { 454 .rpc_argp = &map, 455 }; 456 int error; 457 458 error = rpcb_create_local(); 459 if (error) 460 return error; 461 if (rpcb_local_clnt4 == NULL) 462 return -EPROTONOSUPPORT; 463 464 if (address == NULL) 465 return rpcb_unregister_all_protofamilies(&msg); 466 467 switch (address->sa_family) { 468 case AF_INET: 469 return rpcb_register_inet4(address, &msg); 470 case AF_INET6: 471 return rpcb_register_inet6(address, &msg); 472 } 473 474 return -EAFNOSUPPORT; 475 } 476 477 /** 478 * rpcb_getport_sync - obtain the port for an RPC service on a given host 479 * @sin: address of remote peer 480 * @prog: RPC program number to bind 481 * @vers: RPC version number to bind 482 * @prot: transport protocol to use to make this request 483 * 484 * Return value is the requested advertised port number, 485 * or a negative errno value. 486 * 487 * Called from outside the RPC client in a synchronous task context. 488 * Uses default timeout parameters specified by underlying transport. 489 * 490 * XXX: Needs to support IPv6 491 */ 492 int rpcb_getport_sync(struct sockaddr_in *sin, u32 prog, u32 vers, int prot) 493 { 494 struct rpcbind_args map = { 495 .r_prog = prog, 496 .r_vers = vers, 497 .r_prot = prot, 498 .r_port = 0, 499 }; 500 struct rpc_message msg = { 501 .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT], 502 .rpc_argp = &map, 503 .rpc_resp = &map, 504 }; 505 struct rpc_clnt *rpcb_clnt; 506 int status; 507 508 dprintk("RPC: %s(%pI4, %u, %u, %d)\n", 509 __func__, &sin->sin_addr.s_addr, prog, vers, prot); 510 511 rpcb_clnt = rpcb_create(NULL, (struct sockaddr *)sin, 512 sizeof(*sin), prot, RPCBVERS_2); 513 if (IS_ERR(rpcb_clnt)) 514 return PTR_ERR(rpcb_clnt); 515 516 status = rpc_call_sync(rpcb_clnt, &msg, 0); 517 rpc_shutdown_client(rpcb_clnt); 518 519 if (status >= 0) { 520 if (map.r_port != 0) 521 return map.r_port; 522 status = -EACCES; 523 } 524 return status; 525 } 526 EXPORT_SYMBOL_GPL(rpcb_getport_sync); 527 528 static struct rpc_task *rpcb_call_async(struct rpc_clnt *rpcb_clnt, struct rpcbind_args *map, struct rpc_procinfo *proc) 529 { 530 struct rpc_message msg = { 531 .rpc_proc = proc, 532 .rpc_argp = map, 533 .rpc_resp = map, 534 }; 535 struct rpc_task_setup task_setup_data = { 536 .rpc_client = rpcb_clnt, 537 .rpc_message = &msg, 538 .callback_ops = &rpcb_getport_ops, 539 .callback_data = map, 540 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFTCONN, 541 }; 542 543 return rpc_run_task(&task_setup_data); 544 } 545 546 /* 547 * In the case where rpc clients have been cloned, we want to make 548 * sure that we use the program number/version etc of the actual 549 * owner of the xprt. To do so, we walk back up the tree of parents 550 * to find whoever created the transport and/or whoever has the 551 * autobind flag set. 552 */ 553 static struct rpc_clnt *rpcb_find_transport_owner(struct rpc_clnt *clnt) 554 { 555 struct rpc_clnt *parent = clnt->cl_parent; 556 557 while (parent != clnt) { 558 if (parent->cl_xprt != clnt->cl_xprt) 559 break; 560 if (clnt->cl_autobind) 561 break; 562 clnt = parent; 563 parent = parent->cl_parent; 564 } 565 return clnt; 566 } 567 568 /** 569 * rpcb_getport_async - obtain the port for a given RPC service on a given host 570 * @task: task that is waiting for portmapper request 571 * 572 * This one can be called for an ongoing RPC request, and can be used in 573 * an async (rpciod) context. 574 */ 575 void rpcb_getport_async(struct rpc_task *task) 576 { 577 struct rpc_clnt *clnt; 578 struct rpc_procinfo *proc; 579 u32 bind_version; 580 struct rpc_xprt *xprt; 581 struct rpc_clnt *rpcb_clnt; 582 static struct rpcbind_args *map; 583 struct rpc_task *child; 584 struct sockaddr_storage addr; 585 struct sockaddr *sap = (struct sockaddr *)&addr; 586 size_t salen; 587 int status; 588 589 clnt = rpcb_find_transport_owner(task->tk_client); 590 xprt = clnt->cl_xprt; 591 592 dprintk("RPC: %5u %s(%s, %u, %u, %d)\n", 593 task->tk_pid, __func__, 594 clnt->cl_server, clnt->cl_prog, clnt->cl_vers, xprt->prot); 595 596 /* Put self on the wait queue to ensure we get notified if 597 * some other task is already attempting to bind the port */ 598 rpc_sleep_on(&xprt->binding, task, NULL); 599 600 if (xprt_test_and_set_binding(xprt)) { 601 dprintk("RPC: %5u %s: waiting for another binder\n", 602 task->tk_pid, __func__); 603 return; 604 } 605 606 /* Someone else may have bound if we slept */ 607 if (xprt_bound(xprt)) { 608 status = 0; 609 dprintk("RPC: %5u %s: already bound\n", 610 task->tk_pid, __func__); 611 goto bailout_nofree; 612 } 613 614 /* Parent transport's destination address */ 615 salen = rpc_peeraddr(clnt, sap, sizeof(addr)); 616 617 /* Don't ever use rpcbind v2 for AF_INET6 requests */ 618 switch (sap->sa_family) { 619 case AF_INET: 620 proc = rpcb_next_version[xprt->bind_index].rpc_proc; 621 bind_version = rpcb_next_version[xprt->bind_index].rpc_vers; 622 break; 623 case AF_INET6: 624 proc = rpcb_next_version6[xprt->bind_index].rpc_proc; 625 bind_version = rpcb_next_version6[xprt->bind_index].rpc_vers; 626 break; 627 default: 628 status = -EAFNOSUPPORT; 629 dprintk("RPC: %5u %s: bad address family\n", 630 task->tk_pid, __func__); 631 goto bailout_nofree; 632 } 633 if (proc == NULL) { 634 xprt->bind_index = 0; 635 status = -EPFNOSUPPORT; 636 dprintk("RPC: %5u %s: no more getport versions available\n", 637 task->tk_pid, __func__); 638 goto bailout_nofree; 639 } 640 641 dprintk("RPC: %5u %s: trying rpcbind version %u\n", 642 task->tk_pid, __func__, bind_version); 643 644 rpcb_clnt = rpcb_create(clnt->cl_server, sap, salen, xprt->prot, 645 bind_version); 646 if (IS_ERR(rpcb_clnt)) { 647 status = PTR_ERR(rpcb_clnt); 648 dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n", 649 task->tk_pid, __func__, PTR_ERR(rpcb_clnt)); 650 goto bailout_nofree; 651 } 652 653 map = kzalloc(sizeof(struct rpcbind_args), GFP_ATOMIC); 654 if (!map) { 655 status = -ENOMEM; 656 dprintk("RPC: %5u %s: no memory available\n", 657 task->tk_pid, __func__); 658 goto bailout_release_client; 659 } 660 map->r_prog = clnt->cl_prog; 661 map->r_vers = clnt->cl_vers; 662 map->r_prot = xprt->prot; 663 map->r_port = 0; 664 map->r_xprt = xprt_get(xprt); 665 map->r_status = -EIO; 666 667 switch (bind_version) { 668 case RPCBVERS_4: 669 case RPCBVERS_3: 670 map->r_netid = rpc_peeraddr2str(clnt, RPC_DISPLAY_NETID); 671 map->r_addr = rpc_sockaddr2uaddr(sap); 672 map->r_owner = ""; 673 break; 674 case RPCBVERS_2: 675 map->r_addr = NULL; 676 break; 677 default: 678 BUG(); 679 } 680 681 child = rpcb_call_async(rpcb_clnt, map, proc); 682 rpc_release_client(rpcb_clnt); 683 if (IS_ERR(child)) { 684 /* rpcb_map_release() has freed the arguments */ 685 dprintk("RPC: %5u %s: rpc_run_task failed\n", 686 task->tk_pid, __func__); 687 return; 688 } 689 690 xprt->stat.bind_count++; 691 rpc_put_task(child); 692 return; 693 694 bailout_release_client: 695 rpc_release_client(rpcb_clnt); 696 bailout_nofree: 697 rpcb_wake_rpcbind_waiters(xprt, status); 698 task->tk_status = status; 699 } 700 EXPORT_SYMBOL_GPL(rpcb_getport_async); 701 702 /* 703 * Rpcbind child task calls this callback via tk_exit. 704 */ 705 static void rpcb_getport_done(struct rpc_task *child, void *data) 706 { 707 struct rpcbind_args *map = data; 708 struct rpc_xprt *xprt = map->r_xprt; 709 int status = child->tk_status; 710 711 /* Garbage reply: retry with a lesser rpcbind version */ 712 if (status == -EIO) 713 status = -EPROTONOSUPPORT; 714 715 /* rpcbind server doesn't support this rpcbind protocol version */ 716 if (status == -EPROTONOSUPPORT) 717 xprt->bind_index++; 718 719 if (status < 0) { 720 /* rpcbind server not available on remote host? */ 721 xprt->ops->set_port(xprt, 0); 722 } else if (map->r_port == 0) { 723 /* Requested RPC service wasn't registered on remote host */ 724 xprt->ops->set_port(xprt, 0); 725 status = -EACCES; 726 } else { 727 /* Succeeded */ 728 xprt->ops->set_port(xprt, map->r_port); 729 xprt_set_bound(xprt); 730 status = 0; 731 } 732 733 dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n", 734 child->tk_pid, status, map->r_port); 735 736 map->r_status = status; 737 } 738 739 /* 740 * XDR functions for rpcbind 741 */ 742 743 static int rpcb_enc_mapping(struct rpc_rqst *req, __be32 *p, 744 const struct rpcbind_args *rpcb) 745 { 746 struct rpc_task *task = req->rq_task; 747 struct xdr_stream xdr; 748 749 dprintk("RPC: %5u encoding PMAP_%s call (%u, %u, %d, %u)\n", 750 task->tk_pid, task->tk_msg.rpc_proc->p_name, 751 rpcb->r_prog, rpcb->r_vers, rpcb->r_prot, rpcb->r_port); 752 753 xdr_init_encode(&xdr, &req->rq_snd_buf, p); 754 755 p = xdr_reserve_space(&xdr, sizeof(__be32) * RPCB_mappingargs_sz); 756 if (unlikely(p == NULL)) 757 return -EIO; 758 759 *p++ = htonl(rpcb->r_prog); 760 *p++ = htonl(rpcb->r_vers); 761 *p++ = htonl(rpcb->r_prot); 762 *p = htonl(rpcb->r_port); 763 764 return 0; 765 } 766 767 static int rpcb_dec_getport(struct rpc_rqst *req, __be32 *p, 768 struct rpcbind_args *rpcb) 769 { 770 struct rpc_task *task = req->rq_task; 771 struct xdr_stream xdr; 772 unsigned long port; 773 774 xdr_init_decode(&xdr, &req->rq_rcv_buf, p); 775 776 rpcb->r_port = 0; 777 778 p = xdr_inline_decode(&xdr, sizeof(__be32)); 779 if (unlikely(p == NULL)) 780 return -EIO; 781 782 port = ntohl(*p); 783 dprintk("RPC: %5u PMAP_%s result: %lu\n", task->tk_pid, 784 task->tk_msg.rpc_proc->p_name, port); 785 if (unlikely(port > USHORT_MAX)) 786 return -EIO; 787 788 rpcb->r_port = port; 789 return 0; 790 } 791 792 static int rpcb_dec_set(struct rpc_rqst *req, __be32 *p, 793 unsigned int *boolp) 794 { 795 struct rpc_task *task = req->rq_task; 796 struct xdr_stream xdr; 797 798 xdr_init_decode(&xdr, &req->rq_rcv_buf, p); 799 800 p = xdr_inline_decode(&xdr, sizeof(__be32)); 801 if (unlikely(p == NULL)) 802 return -EIO; 803 804 *boolp = 0; 805 if (*p) 806 *boolp = 1; 807 808 dprintk("RPC: %5u RPCB_%s call %s\n", 809 task->tk_pid, task->tk_msg.rpc_proc->p_name, 810 (*boolp ? "succeeded" : "failed")); 811 return 0; 812 } 813 814 static int encode_rpcb_string(struct xdr_stream *xdr, const char *string, 815 const u32 maxstrlen) 816 { 817 u32 len; 818 __be32 *p; 819 820 if (unlikely(string == NULL)) 821 return -EIO; 822 len = strlen(string); 823 if (unlikely(len > maxstrlen)) 824 return -EIO; 825 826 p = xdr_reserve_space(xdr, sizeof(__be32) + len); 827 if (unlikely(p == NULL)) 828 return -EIO; 829 xdr_encode_opaque(p, string, len); 830 831 return 0; 832 } 833 834 static int rpcb_enc_getaddr(struct rpc_rqst *req, __be32 *p, 835 const struct rpcbind_args *rpcb) 836 { 837 struct rpc_task *task = req->rq_task; 838 struct xdr_stream xdr; 839 840 dprintk("RPC: %5u encoding RPCB_%s call (%u, %u, '%s', '%s')\n", 841 task->tk_pid, task->tk_msg.rpc_proc->p_name, 842 rpcb->r_prog, rpcb->r_vers, 843 rpcb->r_netid, rpcb->r_addr); 844 845 xdr_init_encode(&xdr, &req->rq_snd_buf, p); 846 847 p = xdr_reserve_space(&xdr, 848 sizeof(__be32) * (RPCB_program_sz + RPCB_version_sz)); 849 if (unlikely(p == NULL)) 850 return -EIO; 851 *p++ = htonl(rpcb->r_prog); 852 *p = htonl(rpcb->r_vers); 853 854 if (encode_rpcb_string(&xdr, rpcb->r_netid, RPCBIND_MAXNETIDLEN)) 855 return -EIO; 856 if (encode_rpcb_string(&xdr, rpcb->r_addr, RPCBIND_MAXUADDRLEN)) 857 return -EIO; 858 if (encode_rpcb_string(&xdr, rpcb->r_owner, RPCB_MAXOWNERLEN)) 859 return -EIO; 860 861 return 0; 862 } 863 864 static int rpcb_dec_getaddr(struct rpc_rqst *req, __be32 *p, 865 struct rpcbind_args *rpcb) 866 { 867 struct sockaddr_storage address; 868 struct sockaddr *sap = (struct sockaddr *)&address; 869 struct rpc_task *task = req->rq_task; 870 struct xdr_stream xdr; 871 u32 len; 872 873 rpcb->r_port = 0; 874 875 xdr_init_decode(&xdr, &req->rq_rcv_buf, p); 876 877 p = xdr_inline_decode(&xdr, sizeof(__be32)); 878 if (unlikely(p == NULL)) 879 goto out_fail; 880 len = ntohl(*p); 881 882 /* 883 * If the returned universal address is a null string, 884 * the requested RPC service was not registered. 885 */ 886 if (len == 0) { 887 dprintk("RPC: %5u RPCB reply: program not registered\n", 888 task->tk_pid); 889 return 0; 890 } 891 892 if (unlikely(len > RPCBIND_MAXUADDRLEN)) 893 goto out_fail; 894 895 p = xdr_inline_decode(&xdr, len); 896 if (unlikely(p == NULL)) 897 goto out_fail; 898 dprintk("RPC: %5u RPCB_%s reply: %s\n", task->tk_pid, 899 task->tk_msg.rpc_proc->p_name, (char *)p); 900 901 if (rpc_uaddr2sockaddr((char *)p, len, sap, sizeof(address)) == 0) 902 goto out_fail; 903 rpcb->r_port = rpc_get_port(sap); 904 905 return 0; 906 907 out_fail: 908 dprintk("RPC: %5u malformed RPCB_%s reply\n", 909 task->tk_pid, task->tk_msg.rpc_proc->p_name); 910 return -EIO; 911 } 912 913 /* 914 * Not all rpcbind procedures described in RFC 1833 are implemented 915 * since the Linux kernel RPC code requires only these. 916 */ 917 918 static struct rpc_procinfo rpcb_procedures2[] = { 919 [RPCBPROC_SET] = { 920 .p_proc = RPCBPROC_SET, 921 .p_encode = (kxdrproc_t)rpcb_enc_mapping, 922 .p_decode = (kxdrproc_t)rpcb_dec_set, 923 .p_arglen = RPCB_mappingargs_sz, 924 .p_replen = RPCB_setres_sz, 925 .p_statidx = RPCBPROC_SET, 926 .p_timer = 0, 927 .p_name = "SET", 928 }, 929 [RPCBPROC_UNSET] = { 930 .p_proc = RPCBPROC_UNSET, 931 .p_encode = (kxdrproc_t)rpcb_enc_mapping, 932 .p_decode = (kxdrproc_t)rpcb_dec_set, 933 .p_arglen = RPCB_mappingargs_sz, 934 .p_replen = RPCB_setres_sz, 935 .p_statidx = RPCBPROC_UNSET, 936 .p_timer = 0, 937 .p_name = "UNSET", 938 }, 939 [RPCBPROC_GETPORT] = { 940 .p_proc = RPCBPROC_GETPORT, 941 .p_encode = (kxdrproc_t)rpcb_enc_mapping, 942 .p_decode = (kxdrproc_t)rpcb_dec_getport, 943 .p_arglen = RPCB_mappingargs_sz, 944 .p_replen = RPCB_getportres_sz, 945 .p_statidx = RPCBPROC_GETPORT, 946 .p_timer = 0, 947 .p_name = "GETPORT", 948 }, 949 }; 950 951 static struct rpc_procinfo rpcb_procedures3[] = { 952 [RPCBPROC_SET] = { 953 .p_proc = RPCBPROC_SET, 954 .p_encode = (kxdrproc_t)rpcb_enc_getaddr, 955 .p_decode = (kxdrproc_t)rpcb_dec_set, 956 .p_arglen = RPCB_getaddrargs_sz, 957 .p_replen = RPCB_setres_sz, 958 .p_statidx = RPCBPROC_SET, 959 .p_timer = 0, 960 .p_name = "SET", 961 }, 962 [RPCBPROC_UNSET] = { 963 .p_proc = RPCBPROC_UNSET, 964 .p_encode = (kxdrproc_t)rpcb_enc_getaddr, 965 .p_decode = (kxdrproc_t)rpcb_dec_set, 966 .p_arglen = RPCB_getaddrargs_sz, 967 .p_replen = RPCB_setres_sz, 968 .p_statidx = RPCBPROC_UNSET, 969 .p_timer = 0, 970 .p_name = "UNSET", 971 }, 972 [RPCBPROC_GETADDR] = { 973 .p_proc = RPCBPROC_GETADDR, 974 .p_encode = (kxdrproc_t)rpcb_enc_getaddr, 975 .p_decode = (kxdrproc_t)rpcb_dec_getaddr, 976 .p_arglen = RPCB_getaddrargs_sz, 977 .p_replen = RPCB_getaddrres_sz, 978 .p_statidx = RPCBPROC_GETADDR, 979 .p_timer = 0, 980 .p_name = "GETADDR", 981 }, 982 }; 983 984 static struct rpc_procinfo rpcb_procedures4[] = { 985 [RPCBPROC_SET] = { 986 .p_proc = RPCBPROC_SET, 987 .p_encode = (kxdrproc_t)rpcb_enc_getaddr, 988 .p_decode = (kxdrproc_t)rpcb_dec_set, 989 .p_arglen = RPCB_getaddrargs_sz, 990 .p_replen = RPCB_setres_sz, 991 .p_statidx = RPCBPROC_SET, 992 .p_timer = 0, 993 .p_name = "SET", 994 }, 995 [RPCBPROC_UNSET] = { 996 .p_proc = RPCBPROC_UNSET, 997 .p_encode = (kxdrproc_t)rpcb_enc_getaddr, 998 .p_decode = (kxdrproc_t)rpcb_dec_set, 999 .p_arglen = RPCB_getaddrargs_sz, 1000 .p_replen = RPCB_setres_sz, 1001 .p_statidx = RPCBPROC_UNSET, 1002 .p_timer = 0, 1003 .p_name = "UNSET", 1004 }, 1005 [RPCBPROC_GETADDR] = { 1006 .p_proc = RPCBPROC_GETADDR, 1007 .p_encode = (kxdrproc_t)rpcb_enc_getaddr, 1008 .p_decode = (kxdrproc_t)rpcb_dec_getaddr, 1009 .p_arglen = RPCB_getaddrargs_sz, 1010 .p_replen = RPCB_getaddrres_sz, 1011 .p_statidx = RPCBPROC_GETADDR, 1012 .p_timer = 0, 1013 .p_name = "GETADDR", 1014 }, 1015 }; 1016 1017 static struct rpcb_info rpcb_next_version[] = { 1018 { 1019 .rpc_vers = RPCBVERS_2, 1020 .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT], 1021 }, 1022 { 1023 .rpc_proc = NULL, 1024 }, 1025 }; 1026 1027 static struct rpcb_info rpcb_next_version6[] = { 1028 { 1029 .rpc_vers = RPCBVERS_4, 1030 .rpc_proc = &rpcb_procedures4[RPCBPROC_GETADDR], 1031 }, 1032 { 1033 .rpc_vers = RPCBVERS_3, 1034 .rpc_proc = &rpcb_procedures3[RPCBPROC_GETADDR], 1035 }, 1036 { 1037 .rpc_proc = NULL, 1038 }, 1039 }; 1040 1041 static struct rpc_version rpcb_version2 = { 1042 .number = RPCBVERS_2, 1043 .nrprocs = RPCB_HIGHPROC_2, 1044 .procs = rpcb_procedures2 1045 }; 1046 1047 static struct rpc_version rpcb_version3 = { 1048 .number = RPCBVERS_3, 1049 .nrprocs = RPCB_HIGHPROC_3, 1050 .procs = rpcb_procedures3 1051 }; 1052 1053 static struct rpc_version rpcb_version4 = { 1054 .number = RPCBVERS_4, 1055 .nrprocs = RPCB_HIGHPROC_4, 1056 .procs = rpcb_procedures4 1057 }; 1058 1059 static struct rpc_version *rpcb_version[] = { 1060 NULL, 1061 NULL, 1062 &rpcb_version2, 1063 &rpcb_version3, 1064 &rpcb_version4 1065 }; 1066 1067 static struct rpc_stat rpcb_stats; 1068 1069 static struct rpc_program rpcb_program = { 1070 .name = "rpcbind", 1071 .number = RPCBIND_PROGRAM, 1072 .nrvers = ARRAY_SIZE(rpcb_version), 1073 .version = rpcb_version, 1074 .stats = &rpcb_stats, 1075 }; 1076 1077 /** 1078 * cleanup_rpcb_clnt - remove xprtsock's sysctls, unregister 1079 * 1080 */ 1081 void cleanup_rpcb_clnt(void) 1082 { 1083 if (rpcb_local_clnt4) 1084 rpc_shutdown_client(rpcb_local_clnt4); 1085 if (rpcb_local_clnt) 1086 rpc_shutdown_client(rpcb_local_clnt); 1087 } 1088