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 <linux/slab.h> 25 #include <net/ipv6.h> 26 27 #include <linux/sunrpc/clnt.h> 28 #include <linux/sunrpc/sched.h> 29 #include <linux/sunrpc/xprtsock.h> 30 31 #ifdef RPC_DEBUG 32 # define RPCDBG_FACILITY RPCDBG_BIND 33 #endif 34 35 #define RPCBIND_PROGRAM (100000u) 36 #define RPCBIND_PORT (111u) 37 38 #define RPCBVERS_2 (2u) 39 #define RPCBVERS_3 (3u) 40 #define RPCBVERS_4 (4u) 41 42 enum { 43 RPCBPROC_NULL, 44 RPCBPROC_SET, 45 RPCBPROC_UNSET, 46 RPCBPROC_GETPORT, 47 RPCBPROC_GETADDR = 3, /* alias for GETPORT */ 48 RPCBPROC_DUMP, 49 RPCBPROC_CALLIT, 50 RPCBPROC_BCAST = 5, /* alias for CALLIT */ 51 RPCBPROC_GETTIME, 52 RPCBPROC_UADDR2TADDR, 53 RPCBPROC_TADDR2UADDR, 54 RPCBPROC_GETVERSADDR, 55 RPCBPROC_INDIRECT, 56 RPCBPROC_GETADDRLIST, 57 RPCBPROC_GETSTAT, 58 }; 59 60 #define RPCB_HIGHPROC_2 RPCBPROC_CALLIT 61 #define RPCB_HIGHPROC_3 RPCBPROC_TADDR2UADDR 62 #define RPCB_HIGHPROC_4 RPCBPROC_GETSTAT 63 64 /* 65 * r_owner 66 * 67 * The "owner" is allowed to unset a service in the rpcbind database. 68 * 69 * For AF_LOCAL SET/UNSET requests, rpcbind treats this string as a 70 * UID which it maps to a local user name via a password lookup. 71 * In all other cases it is ignored. 72 * 73 * For SET/UNSET requests, user space provides a value, even for 74 * network requests, and GETADDR uses an empty string. We follow 75 * those precedents here. 76 */ 77 #define RPCB_OWNER_STRING "0" 78 #define RPCB_MAXOWNERLEN sizeof(RPCB_OWNER_STRING) 79 80 /* 81 * XDR data type sizes 82 */ 83 #define RPCB_program_sz (1) 84 #define RPCB_version_sz (1) 85 #define RPCB_protocol_sz (1) 86 #define RPCB_port_sz (1) 87 #define RPCB_boolean_sz (1) 88 89 #define RPCB_netid_sz (1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN)) 90 #define RPCB_addr_sz (1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN)) 91 #define RPCB_ownerstring_sz (1 + XDR_QUADLEN(RPCB_MAXOWNERLEN)) 92 93 /* 94 * XDR argument and result sizes 95 */ 96 #define RPCB_mappingargs_sz (RPCB_program_sz + RPCB_version_sz + \ 97 RPCB_protocol_sz + RPCB_port_sz) 98 #define RPCB_getaddrargs_sz (RPCB_program_sz + RPCB_version_sz + \ 99 RPCB_netid_sz + RPCB_addr_sz + \ 100 RPCB_ownerstring_sz) 101 102 #define RPCB_getportres_sz RPCB_port_sz 103 #define RPCB_setres_sz RPCB_boolean_sz 104 105 /* 106 * Note that RFC 1833 does not put any size restrictions on the 107 * address string returned by the remote rpcbind database. 108 */ 109 #define RPCB_getaddrres_sz RPCB_addr_sz 110 111 static void rpcb_getport_done(struct rpc_task *, void *); 112 static void rpcb_map_release(void *data); 113 static struct rpc_program rpcb_program; 114 115 static struct rpc_clnt * rpcb_local_clnt; 116 static struct rpc_clnt * rpcb_local_clnt4; 117 118 struct rpcbind_args { 119 struct rpc_xprt * r_xprt; 120 121 u32 r_prog; 122 u32 r_vers; 123 u32 r_prot; 124 unsigned short r_port; 125 const char * r_netid; 126 const char * r_addr; 127 const char * r_owner; 128 129 int r_status; 130 }; 131 132 static struct rpc_procinfo rpcb_procedures2[]; 133 static struct rpc_procinfo rpcb_procedures3[]; 134 static struct rpc_procinfo rpcb_procedures4[]; 135 136 struct rpcb_info { 137 u32 rpc_vers; 138 struct rpc_procinfo * rpc_proc; 139 }; 140 141 static struct rpcb_info rpcb_next_version[]; 142 static struct rpcb_info rpcb_next_version6[]; 143 144 static const struct rpc_call_ops rpcb_getport_ops = { 145 .rpc_call_done = rpcb_getport_done, 146 .rpc_release = rpcb_map_release, 147 }; 148 149 static void rpcb_wake_rpcbind_waiters(struct rpc_xprt *xprt, int status) 150 { 151 xprt_clear_binding(xprt); 152 rpc_wake_up_status(&xprt->binding, status); 153 } 154 155 static void rpcb_map_release(void *data) 156 { 157 struct rpcbind_args *map = data; 158 159 rpcb_wake_rpcbind_waiters(map->r_xprt, map->r_status); 160 xprt_put(map->r_xprt); 161 kfree(map->r_addr); 162 kfree(map); 163 } 164 165 static const struct sockaddr_in rpcb_inaddr_loopback = { 166 .sin_family = AF_INET, 167 .sin_addr.s_addr = htonl(INADDR_LOOPBACK), 168 .sin_port = htons(RPCBIND_PORT), 169 }; 170 171 static DEFINE_MUTEX(rpcb_create_local_mutex); 172 173 /* 174 * Returns zero on success, otherwise a negative errno value 175 * is returned. 176 */ 177 static int rpcb_create_local(void) 178 { 179 struct rpc_create_args args = { 180 .protocol = XPRT_TRANSPORT_TCP, 181 .address = (struct sockaddr *)&rpcb_inaddr_loopback, 182 .addrsize = sizeof(rpcb_inaddr_loopback), 183 .servername = "localhost", 184 .program = &rpcb_program, 185 .version = RPCBVERS_2, 186 .authflavor = RPC_AUTH_UNIX, 187 .flags = RPC_CLNT_CREATE_NOPING, 188 }; 189 struct rpc_clnt *clnt, *clnt4; 190 int result = 0; 191 192 if (rpcb_local_clnt) 193 return result; 194 195 mutex_lock(&rpcb_create_local_mutex); 196 if (rpcb_local_clnt) 197 goto out; 198 199 clnt = rpc_create(&args); 200 if (IS_ERR(clnt)) { 201 dprintk("RPC: failed to create local rpcbind " 202 "client (errno %ld).\n", PTR_ERR(clnt)); 203 result = -PTR_ERR(clnt); 204 goto out; 205 } 206 207 /* 208 * This results in an RPC ping. On systems running portmapper, 209 * the v4 ping will fail. Proceed anyway, but disallow rpcb 210 * v4 upcalls. 211 */ 212 clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4); 213 if (IS_ERR(clnt4)) { 214 dprintk("RPC: failed to create local rpcbind v4 " 215 "cleint (errno %ld).\n", PTR_ERR(clnt4)); 216 clnt4 = NULL; 217 } 218 219 rpcb_local_clnt = clnt; 220 rpcb_local_clnt4 = clnt4; 221 222 out: 223 mutex_unlock(&rpcb_create_local_mutex); 224 return result; 225 } 226 227 static struct rpc_clnt *rpcb_create(char *hostname, struct sockaddr *srvaddr, 228 size_t salen, int proto, u32 version) 229 { 230 struct rpc_create_args args = { 231 .protocol = proto, 232 .address = srvaddr, 233 .addrsize = salen, 234 .servername = hostname, 235 .program = &rpcb_program, 236 .version = version, 237 .authflavor = RPC_AUTH_UNIX, 238 .flags = (RPC_CLNT_CREATE_NOPING | 239 RPC_CLNT_CREATE_NONPRIVPORT), 240 }; 241 242 switch (srvaddr->sa_family) { 243 case AF_INET: 244 ((struct sockaddr_in *)srvaddr)->sin_port = htons(RPCBIND_PORT); 245 break; 246 case AF_INET6: 247 ((struct sockaddr_in6 *)srvaddr)->sin6_port = htons(RPCBIND_PORT); 248 break; 249 default: 250 return NULL; 251 } 252 253 return rpc_create(&args); 254 } 255 256 static int rpcb_register_call(struct rpc_clnt *clnt, struct rpc_message *msg) 257 { 258 int result, error = 0; 259 260 msg->rpc_resp = &result; 261 262 error = rpc_call_sync(clnt, msg, RPC_TASK_SOFTCONN); 263 if (error < 0) { 264 dprintk("RPC: failed to contact local rpcbind " 265 "server (errno %d).\n", -error); 266 return error; 267 } 268 269 if (!result) 270 return -EACCES; 271 return 0; 272 } 273 274 /** 275 * rpcb_register - set or unset a port registration with the local rpcbind svc 276 * @prog: RPC program number to bind 277 * @vers: RPC version number to bind 278 * @prot: transport protocol to register 279 * @port: port value to register 280 * 281 * Returns zero if the registration request was dispatched successfully 282 * and the rpcbind daemon returned success. Otherwise, returns an errno 283 * value that reflects the nature of the error (request could not be 284 * dispatched, timed out, or rpcbind returned an error). 285 * 286 * RPC services invoke this function to advertise their contact 287 * information via the system's rpcbind daemon. RPC services 288 * invoke this function once for each [program, version, transport] 289 * tuple they wish to advertise. 290 * 291 * Callers may also unregister RPC services that are no longer 292 * available by setting the passed-in port to zero. This removes 293 * all registered transports for [program, version] from the local 294 * rpcbind database. 295 * 296 * This function uses rpcbind protocol version 2 to contact the 297 * local rpcbind daemon. 298 * 299 * Registration works over both AF_INET and AF_INET6, and services 300 * registered via this function are advertised as available for any 301 * address. If the local rpcbind daemon is listening on AF_INET6, 302 * services registered via this function will be advertised on 303 * IN6ADDR_ANY (ie available for all AF_INET and AF_INET6 304 * addresses). 305 */ 306 int rpcb_register(u32 prog, u32 vers, int prot, unsigned short port) 307 { 308 struct rpcbind_args map = { 309 .r_prog = prog, 310 .r_vers = vers, 311 .r_prot = prot, 312 .r_port = port, 313 }; 314 struct rpc_message msg = { 315 .rpc_argp = &map, 316 }; 317 int error; 318 319 error = rpcb_create_local(); 320 if (error) 321 return error; 322 323 dprintk("RPC: %sregistering (%u, %u, %d, %u) with local " 324 "rpcbind\n", (port ? "" : "un"), 325 prog, vers, prot, port); 326 327 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_UNSET]; 328 if (port) 329 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_SET]; 330 331 return rpcb_register_call(rpcb_local_clnt, &msg); 332 } 333 334 /* 335 * Fill in AF_INET family-specific arguments to register 336 */ 337 static int rpcb_register_inet4(const struct sockaddr *sap, 338 struct rpc_message *msg) 339 { 340 const struct sockaddr_in *sin = (const struct sockaddr_in *)sap; 341 struct rpcbind_args *map = msg->rpc_argp; 342 unsigned short port = ntohs(sin->sin_port); 343 int result; 344 345 map->r_addr = rpc_sockaddr2uaddr(sap); 346 347 dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with " 348 "local rpcbind\n", (port ? "" : "un"), 349 map->r_prog, map->r_vers, 350 map->r_addr, map->r_netid); 351 352 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET]; 353 if (port) 354 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET]; 355 356 result = rpcb_register_call(rpcb_local_clnt4, msg); 357 kfree(map->r_addr); 358 return result; 359 } 360 361 /* 362 * Fill in AF_INET6 family-specific arguments to register 363 */ 364 static int rpcb_register_inet6(const struct sockaddr *sap, 365 struct rpc_message *msg) 366 { 367 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sap; 368 struct rpcbind_args *map = msg->rpc_argp; 369 unsigned short port = ntohs(sin6->sin6_port); 370 int result; 371 372 map->r_addr = rpc_sockaddr2uaddr(sap); 373 374 dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with " 375 "local rpcbind\n", (port ? "" : "un"), 376 map->r_prog, map->r_vers, 377 map->r_addr, map->r_netid); 378 379 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET]; 380 if (port) 381 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET]; 382 383 result = rpcb_register_call(rpcb_local_clnt4, msg); 384 kfree(map->r_addr); 385 return result; 386 } 387 388 static int rpcb_unregister_all_protofamilies(struct rpc_message *msg) 389 { 390 struct rpcbind_args *map = msg->rpc_argp; 391 392 dprintk("RPC: unregistering [%u, %u, '%s'] with " 393 "local rpcbind\n", 394 map->r_prog, map->r_vers, map->r_netid); 395 396 map->r_addr = ""; 397 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET]; 398 399 return rpcb_register_call(rpcb_local_clnt4, msg); 400 } 401 402 /** 403 * rpcb_v4_register - set or unset a port registration with the local rpcbind 404 * @program: RPC program number of service to (un)register 405 * @version: RPC version number of service to (un)register 406 * @address: address family, IP address, and port to (un)register 407 * @netid: netid of transport protocol to (un)register 408 * 409 * Returns zero if the registration request was dispatched successfully 410 * and the rpcbind daemon returned success. Otherwise, returns an errno 411 * value that reflects the nature of the error (request could not be 412 * dispatched, timed out, or rpcbind returned an error). 413 * 414 * RPC services invoke this function to advertise their contact 415 * information via the system's rpcbind daemon. RPC services 416 * invoke this function once for each [program, version, address, 417 * netid] tuple they wish to advertise. 418 * 419 * Callers may also unregister RPC services that are registered at a 420 * specific address by setting the port number in @address to zero. 421 * They may unregister all registered protocol families at once for 422 * a service by passing a NULL @address argument. If @netid is "" 423 * then all netids for [program, version, address] are unregistered. 424 * 425 * This function uses rpcbind protocol version 4 to contact the 426 * local rpcbind daemon. The local rpcbind daemon must support 427 * version 4 of the rpcbind protocol in order for these functions 428 * to register a service successfully. 429 * 430 * Supported netids include "udp" and "tcp" for UDP and TCP over 431 * IPv4, and "udp6" and "tcp6" for UDP and TCP over IPv6, 432 * respectively. 433 * 434 * The contents of @address determine the address family and the 435 * port to be registered. The usual practice is to pass INADDR_ANY 436 * as the raw address, but specifying a non-zero address is also 437 * supported by this API if the caller wishes to advertise an RPC 438 * service on a specific network interface. 439 * 440 * Note that passing in INADDR_ANY does not create the same service 441 * registration as IN6ADDR_ANY. The former advertises an RPC 442 * service on any IPv4 address, but not on IPv6. The latter 443 * advertises the service on all IPv4 and IPv6 addresses. 444 */ 445 int rpcb_v4_register(const u32 program, const u32 version, 446 const struct sockaddr *address, const char *netid) 447 { 448 struct rpcbind_args map = { 449 .r_prog = program, 450 .r_vers = version, 451 .r_netid = netid, 452 .r_owner = RPCB_OWNER_STRING, 453 }; 454 struct rpc_message msg = { 455 .rpc_argp = &map, 456 }; 457 int error; 458 459 error = rpcb_create_local(); 460 if (error) 461 return error; 462 if (rpcb_local_clnt4 == NULL) 463 return -EPROTONOSUPPORT; 464 465 if (address == NULL) 466 return rpcb_unregister_all_protofamilies(&msg); 467 468 switch (address->sa_family) { 469 case AF_INET: 470 return rpcb_register_inet4(address, &msg); 471 case AF_INET6: 472 return rpcb_register_inet6(address, &msg); 473 } 474 475 return -EAFNOSUPPORT; 476 } 477 478 /** 479 * rpcb_getport_sync - obtain the port for an RPC service on a given host 480 * @sin: address of remote peer 481 * @prog: RPC program number to bind 482 * @vers: RPC version number to bind 483 * @prot: transport protocol to use to make this request 484 * 485 * Return value is the requested advertised port number, 486 * or a negative errno value. 487 * 488 * Called from outside the RPC client in a synchronous task context. 489 * Uses default timeout parameters specified by underlying transport. 490 * 491 * XXX: Needs to support IPv6 492 */ 493 int rpcb_getport_sync(struct sockaddr_in *sin, u32 prog, u32 vers, int prot) 494 { 495 struct rpcbind_args map = { 496 .r_prog = prog, 497 .r_vers = vers, 498 .r_prot = prot, 499 .r_port = 0, 500 }; 501 struct rpc_message msg = { 502 .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT], 503 .rpc_argp = &map, 504 .rpc_resp = &map, 505 }; 506 struct rpc_clnt *rpcb_clnt; 507 int status; 508 509 dprintk("RPC: %s(%pI4, %u, %u, %d)\n", 510 __func__, &sin->sin_addr.s_addr, prog, vers, prot); 511 512 rpcb_clnt = rpcb_create(NULL, (struct sockaddr *)sin, 513 sizeof(*sin), prot, RPCBVERS_2); 514 if (IS_ERR(rpcb_clnt)) 515 return PTR_ERR(rpcb_clnt); 516 517 status = rpc_call_sync(rpcb_clnt, &msg, 0); 518 rpc_shutdown_client(rpcb_clnt); 519 520 if (status >= 0) { 521 if (map.r_port != 0) 522 return map.r_port; 523 status = -EACCES; 524 } 525 return status; 526 } 527 EXPORT_SYMBOL_GPL(rpcb_getport_sync); 528 529 static struct rpc_task *rpcb_call_async(struct rpc_clnt *rpcb_clnt, struct rpcbind_args *map, struct rpc_procinfo *proc) 530 { 531 struct rpc_message msg = { 532 .rpc_proc = proc, 533 .rpc_argp = map, 534 .rpc_resp = map, 535 }; 536 struct rpc_task_setup task_setup_data = { 537 .rpc_client = rpcb_clnt, 538 .rpc_message = &msg, 539 .callback_ops = &rpcb_getport_ops, 540 .callback_data = map, 541 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFTCONN, 542 }; 543 544 return rpc_run_task(&task_setup_data); 545 } 546 547 /* 548 * In the case where rpc clients have been cloned, we want to make 549 * sure that we use the program number/version etc of the actual 550 * owner of the xprt. To do so, we walk back up the tree of parents 551 * to find whoever created the transport and/or whoever has the 552 * autobind flag set. 553 */ 554 static struct rpc_clnt *rpcb_find_transport_owner(struct rpc_clnt *clnt) 555 { 556 struct rpc_clnt *parent = clnt->cl_parent; 557 558 while (parent != clnt) { 559 if (parent->cl_xprt != clnt->cl_xprt) 560 break; 561 if (clnt->cl_autobind) 562 break; 563 clnt = parent; 564 parent = parent->cl_parent; 565 } 566 return clnt; 567 } 568 569 /** 570 * rpcb_getport_async - obtain the port for a given RPC service on a given host 571 * @task: task that is waiting for portmapper request 572 * 573 * This one can be called for an ongoing RPC request, and can be used in 574 * an async (rpciod) context. 575 */ 576 void rpcb_getport_async(struct rpc_task *task) 577 { 578 struct rpc_clnt *clnt; 579 struct rpc_procinfo *proc; 580 u32 bind_version; 581 struct rpc_xprt *xprt; 582 struct rpc_clnt *rpcb_clnt; 583 static struct rpcbind_args *map; 584 struct rpc_task *child; 585 struct sockaddr_storage addr; 586 struct sockaddr *sap = (struct sockaddr *)&addr; 587 size_t salen; 588 int status; 589 590 clnt = rpcb_find_transport_owner(task->tk_client); 591 xprt = clnt->cl_xprt; 592 593 dprintk("RPC: %5u %s(%s, %u, %u, %d)\n", 594 task->tk_pid, __func__, 595 clnt->cl_server, clnt->cl_prog, clnt->cl_vers, xprt->prot); 596 597 /* Put self on the wait queue to ensure we get notified if 598 * some other task is already attempting to bind the port */ 599 rpc_sleep_on(&xprt->binding, task, NULL); 600 601 if (xprt_test_and_set_binding(xprt)) { 602 dprintk("RPC: %5u %s: waiting for another binder\n", 603 task->tk_pid, __func__); 604 return; 605 } 606 607 /* Someone else may have bound if we slept */ 608 if (xprt_bound(xprt)) { 609 status = 0; 610 dprintk("RPC: %5u %s: already bound\n", 611 task->tk_pid, __func__); 612 goto bailout_nofree; 613 } 614 615 /* Parent transport's destination address */ 616 salen = rpc_peeraddr(clnt, sap, sizeof(addr)); 617 618 /* Don't ever use rpcbind v2 for AF_INET6 requests */ 619 switch (sap->sa_family) { 620 case AF_INET: 621 proc = rpcb_next_version[xprt->bind_index].rpc_proc; 622 bind_version = rpcb_next_version[xprt->bind_index].rpc_vers; 623 break; 624 case AF_INET6: 625 proc = rpcb_next_version6[xprt->bind_index].rpc_proc; 626 bind_version = rpcb_next_version6[xprt->bind_index].rpc_vers; 627 break; 628 default: 629 status = -EAFNOSUPPORT; 630 dprintk("RPC: %5u %s: bad address family\n", 631 task->tk_pid, __func__); 632 goto bailout_nofree; 633 } 634 if (proc == NULL) { 635 xprt->bind_index = 0; 636 status = -EPFNOSUPPORT; 637 dprintk("RPC: %5u %s: no more getport versions available\n", 638 task->tk_pid, __func__); 639 goto bailout_nofree; 640 } 641 642 dprintk("RPC: %5u %s: trying rpcbind version %u\n", 643 task->tk_pid, __func__, bind_version); 644 645 rpcb_clnt = rpcb_create(clnt->cl_server, sap, salen, xprt->prot, 646 bind_version); 647 if (IS_ERR(rpcb_clnt)) { 648 status = PTR_ERR(rpcb_clnt); 649 dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n", 650 task->tk_pid, __func__, PTR_ERR(rpcb_clnt)); 651 goto bailout_nofree; 652 } 653 654 map = kzalloc(sizeof(struct rpcbind_args), GFP_ATOMIC); 655 if (!map) { 656 status = -ENOMEM; 657 dprintk("RPC: %5u %s: no memory available\n", 658 task->tk_pid, __func__); 659 goto bailout_release_client; 660 } 661 map->r_prog = clnt->cl_prog; 662 map->r_vers = clnt->cl_vers; 663 map->r_prot = xprt->prot; 664 map->r_port = 0; 665 map->r_xprt = xprt_get(xprt); 666 map->r_status = -EIO; 667 668 switch (bind_version) { 669 case RPCBVERS_4: 670 case RPCBVERS_3: 671 map->r_netid = rpc_peeraddr2str(clnt, RPC_DISPLAY_NETID); 672 map->r_addr = rpc_sockaddr2uaddr(sap); 673 map->r_owner = ""; 674 break; 675 case RPCBVERS_2: 676 map->r_addr = NULL; 677 break; 678 default: 679 BUG(); 680 } 681 682 child = rpcb_call_async(rpcb_clnt, map, proc); 683 rpc_release_client(rpcb_clnt); 684 if (IS_ERR(child)) { 685 /* rpcb_map_release() has freed the arguments */ 686 dprintk("RPC: %5u %s: rpc_run_task failed\n", 687 task->tk_pid, __func__); 688 return; 689 } 690 691 xprt->stat.bind_count++; 692 rpc_put_task(child); 693 return; 694 695 bailout_release_client: 696 rpc_release_client(rpcb_clnt); 697 bailout_nofree: 698 rpcb_wake_rpcbind_waiters(xprt, status); 699 task->tk_status = status; 700 } 701 EXPORT_SYMBOL_GPL(rpcb_getport_async); 702 703 /* 704 * Rpcbind child task calls this callback via tk_exit. 705 */ 706 static void rpcb_getport_done(struct rpc_task *child, void *data) 707 { 708 struct rpcbind_args *map = data; 709 struct rpc_xprt *xprt = map->r_xprt; 710 int status = child->tk_status; 711 712 /* Garbage reply: retry with a lesser rpcbind version */ 713 if (status == -EIO) 714 status = -EPROTONOSUPPORT; 715 716 /* rpcbind server doesn't support this rpcbind protocol version */ 717 if (status == -EPROTONOSUPPORT) 718 xprt->bind_index++; 719 720 if (status < 0) { 721 /* rpcbind server not available on remote host? */ 722 xprt->ops->set_port(xprt, 0); 723 } else if (map->r_port == 0) { 724 /* Requested RPC service wasn't registered on remote host */ 725 xprt->ops->set_port(xprt, 0); 726 status = -EACCES; 727 } else { 728 /* Succeeded */ 729 xprt->ops->set_port(xprt, map->r_port); 730 xprt_set_bound(xprt); 731 status = 0; 732 } 733 734 dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n", 735 child->tk_pid, status, map->r_port); 736 737 map->r_status = status; 738 } 739 740 /* 741 * XDR functions for rpcbind 742 */ 743 744 static int rpcb_enc_mapping(struct rpc_rqst *req, __be32 *p, 745 const struct rpcbind_args *rpcb) 746 { 747 struct rpc_task *task = req->rq_task; 748 struct xdr_stream xdr; 749 750 dprintk("RPC: %5u encoding PMAP_%s call (%u, %u, %d, %u)\n", 751 task->tk_pid, task->tk_msg.rpc_proc->p_name, 752 rpcb->r_prog, rpcb->r_vers, rpcb->r_prot, rpcb->r_port); 753 754 xdr_init_encode(&xdr, &req->rq_snd_buf, p); 755 756 p = xdr_reserve_space(&xdr, sizeof(__be32) * RPCB_mappingargs_sz); 757 if (unlikely(p == NULL)) 758 return -EIO; 759 760 *p++ = htonl(rpcb->r_prog); 761 *p++ = htonl(rpcb->r_vers); 762 *p++ = htonl(rpcb->r_prot); 763 *p = htonl(rpcb->r_port); 764 765 return 0; 766 } 767 768 static int rpcb_dec_getport(struct rpc_rqst *req, __be32 *p, 769 struct rpcbind_args *rpcb) 770 { 771 struct rpc_task *task = req->rq_task; 772 struct xdr_stream xdr; 773 unsigned long port; 774 775 xdr_init_decode(&xdr, &req->rq_rcv_buf, p); 776 777 rpcb->r_port = 0; 778 779 p = xdr_inline_decode(&xdr, sizeof(__be32)); 780 if (unlikely(p == NULL)) 781 return -EIO; 782 783 port = ntohl(*p); 784 dprintk("RPC: %5u PMAP_%s result: %lu\n", task->tk_pid, 785 task->tk_msg.rpc_proc->p_name, port); 786 if (unlikely(port > USHRT_MAX)) 787 return -EIO; 788 789 rpcb->r_port = port; 790 return 0; 791 } 792 793 static int rpcb_dec_set(struct rpc_rqst *req, __be32 *p, 794 unsigned int *boolp) 795 { 796 struct rpc_task *task = req->rq_task; 797 struct xdr_stream xdr; 798 799 xdr_init_decode(&xdr, &req->rq_rcv_buf, p); 800 801 p = xdr_inline_decode(&xdr, sizeof(__be32)); 802 if (unlikely(p == NULL)) 803 return -EIO; 804 805 *boolp = 0; 806 if (*p) 807 *boolp = 1; 808 809 dprintk("RPC: %5u RPCB_%s call %s\n", 810 task->tk_pid, task->tk_msg.rpc_proc->p_name, 811 (*boolp ? "succeeded" : "failed")); 812 return 0; 813 } 814 815 static int encode_rpcb_string(struct xdr_stream *xdr, const char *string, 816 const u32 maxstrlen) 817 { 818 u32 len; 819 __be32 *p; 820 821 if (unlikely(string == NULL)) 822 return -EIO; 823 len = strlen(string); 824 if (unlikely(len > maxstrlen)) 825 return -EIO; 826 827 p = xdr_reserve_space(xdr, sizeof(__be32) + len); 828 if (unlikely(p == NULL)) 829 return -EIO; 830 xdr_encode_opaque(p, string, len); 831 832 return 0; 833 } 834 835 static int rpcb_enc_getaddr(struct rpc_rqst *req, __be32 *p, 836 const struct rpcbind_args *rpcb) 837 { 838 struct rpc_task *task = req->rq_task; 839 struct xdr_stream xdr; 840 841 dprintk("RPC: %5u encoding RPCB_%s call (%u, %u, '%s', '%s')\n", 842 task->tk_pid, task->tk_msg.rpc_proc->p_name, 843 rpcb->r_prog, rpcb->r_vers, 844 rpcb->r_netid, rpcb->r_addr); 845 846 xdr_init_encode(&xdr, &req->rq_snd_buf, p); 847 848 p = xdr_reserve_space(&xdr, 849 sizeof(__be32) * (RPCB_program_sz + RPCB_version_sz)); 850 if (unlikely(p == NULL)) 851 return -EIO; 852 *p++ = htonl(rpcb->r_prog); 853 *p = htonl(rpcb->r_vers); 854 855 if (encode_rpcb_string(&xdr, rpcb->r_netid, RPCBIND_MAXNETIDLEN)) 856 return -EIO; 857 if (encode_rpcb_string(&xdr, rpcb->r_addr, RPCBIND_MAXUADDRLEN)) 858 return -EIO; 859 if (encode_rpcb_string(&xdr, rpcb->r_owner, RPCB_MAXOWNERLEN)) 860 return -EIO; 861 862 return 0; 863 } 864 865 static int rpcb_dec_getaddr(struct rpc_rqst *req, __be32 *p, 866 struct rpcbind_args *rpcb) 867 { 868 struct sockaddr_storage address; 869 struct sockaddr *sap = (struct sockaddr *)&address; 870 struct rpc_task *task = req->rq_task; 871 struct xdr_stream xdr; 872 u32 len; 873 874 rpcb->r_port = 0; 875 876 xdr_init_decode(&xdr, &req->rq_rcv_buf, p); 877 878 p = xdr_inline_decode(&xdr, sizeof(__be32)); 879 if (unlikely(p == NULL)) 880 goto out_fail; 881 len = ntohl(*p); 882 883 /* 884 * If the returned universal address is a null string, 885 * the requested RPC service was not registered. 886 */ 887 if (len == 0) { 888 dprintk("RPC: %5u RPCB reply: program not registered\n", 889 task->tk_pid); 890 return 0; 891 } 892 893 if (unlikely(len > RPCBIND_MAXUADDRLEN)) 894 goto out_fail; 895 896 p = xdr_inline_decode(&xdr, len); 897 if (unlikely(p == NULL)) 898 goto out_fail; 899 dprintk("RPC: %5u RPCB_%s reply: %s\n", task->tk_pid, 900 task->tk_msg.rpc_proc->p_name, (char *)p); 901 902 if (rpc_uaddr2sockaddr((char *)p, len, sap, sizeof(address)) == 0) 903 goto out_fail; 904 rpcb->r_port = rpc_get_port(sap); 905 906 return 0; 907 908 out_fail: 909 dprintk("RPC: %5u malformed RPCB_%s reply\n", 910 task->tk_pid, task->tk_msg.rpc_proc->p_name); 911 return -EIO; 912 } 913 914 /* 915 * Not all rpcbind procedures described in RFC 1833 are implemented 916 * since the Linux kernel RPC code requires only these. 917 */ 918 919 static struct rpc_procinfo rpcb_procedures2[] = { 920 [RPCBPROC_SET] = { 921 .p_proc = RPCBPROC_SET, 922 .p_encode = (kxdrproc_t)rpcb_enc_mapping, 923 .p_decode = (kxdrproc_t)rpcb_dec_set, 924 .p_arglen = RPCB_mappingargs_sz, 925 .p_replen = RPCB_setres_sz, 926 .p_statidx = RPCBPROC_SET, 927 .p_timer = 0, 928 .p_name = "SET", 929 }, 930 [RPCBPROC_UNSET] = { 931 .p_proc = RPCBPROC_UNSET, 932 .p_encode = (kxdrproc_t)rpcb_enc_mapping, 933 .p_decode = (kxdrproc_t)rpcb_dec_set, 934 .p_arglen = RPCB_mappingargs_sz, 935 .p_replen = RPCB_setres_sz, 936 .p_statidx = RPCBPROC_UNSET, 937 .p_timer = 0, 938 .p_name = "UNSET", 939 }, 940 [RPCBPROC_GETPORT] = { 941 .p_proc = RPCBPROC_GETPORT, 942 .p_encode = (kxdrproc_t)rpcb_enc_mapping, 943 .p_decode = (kxdrproc_t)rpcb_dec_getport, 944 .p_arglen = RPCB_mappingargs_sz, 945 .p_replen = RPCB_getportres_sz, 946 .p_statidx = RPCBPROC_GETPORT, 947 .p_timer = 0, 948 .p_name = "GETPORT", 949 }, 950 }; 951 952 static struct rpc_procinfo rpcb_procedures3[] = { 953 [RPCBPROC_SET] = { 954 .p_proc = RPCBPROC_SET, 955 .p_encode = (kxdrproc_t)rpcb_enc_getaddr, 956 .p_decode = (kxdrproc_t)rpcb_dec_set, 957 .p_arglen = RPCB_getaddrargs_sz, 958 .p_replen = RPCB_setres_sz, 959 .p_statidx = RPCBPROC_SET, 960 .p_timer = 0, 961 .p_name = "SET", 962 }, 963 [RPCBPROC_UNSET] = { 964 .p_proc = RPCBPROC_UNSET, 965 .p_encode = (kxdrproc_t)rpcb_enc_getaddr, 966 .p_decode = (kxdrproc_t)rpcb_dec_set, 967 .p_arglen = RPCB_getaddrargs_sz, 968 .p_replen = RPCB_setres_sz, 969 .p_statidx = RPCBPROC_UNSET, 970 .p_timer = 0, 971 .p_name = "UNSET", 972 }, 973 [RPCBPROC_GETADDR] = { 974 .p_proc = RPCBPROC_GETADDR, 975 .p_encode = (kxdrproc_t)rpcb_enc_getaddr, 976 .p_decode = (kxdrproc_t)rpcb_dec_getaddr, 977 .p_arglen = RPCB_getaddrargs_sz, 978 .p_replen = RPCB_getaddrres_sz, 979 .p_statidx = RPCBPROC_GETADDR, 980 .p_timer = 0, 981 .p_name = "GETADDR", 982 }, 983 }; 984 985 static struct rpc_procinfo rpcb_procedures4[] = { 986 [RPCBPROC_SET] = { 987 .p_proc = RPCBPROC_SET, 988 .p_encode = (kxdrproc_t)rpcb_enc_getaddr, 989 .p_decode = (kxdrproc_t)rpcb_dec_set, 990 .p_arglen = RPCB_getaddrargs_sz, 991 .p_replen = RPCB_setres_sz, 992 .p_statidx = RPCBPROC_SET, 993 .p_timer = 0, 994 .p_name = "SET", 995 }, 996 [RPCBPROC_UNSET] = { 997 .p_proc = RPCBPROC_UNSET, 998 .p_encode = (kxdrproc_t)rpcb_enc_getaddr, 999 .p_decode = (kxdrproc_t)rpcb_dec_set, 1000 .p_arglen = RPCB_getaddrargs_sz, 1001 .p_replen = RPCB_setres_sz, 1002 .p_statidx = RPCBPROC_UNSET, 1003 .p_timer = 0, 1004 .p_name = "UNSET", 1005 }, 1006 [RPCBPROC_GETADDR] = { 1007 .p_proc = RPCBPROC_GETADDR, 1008 .p_encode = (kxdrproc_t)rpcb_enc_getaddr, 1009 .p_decode = (kxdrproc_t)rpcb_dec_getaddr, 1010 .p_arglen = RPCB_getaddrargs_sz, 1011 .p_replen = RPCB_getaddrres_sz, 1012 .p_statidx = RPCBPROC_GETADDR, 1013 .p_timer = 0, 1014 .p_name = "GETADDR", 1015 }, 1016 }; 1017 1018 static struct rpcb_info rpcb_next_version[] = { 1019 { 1020 .rpc_vers = RPCBVERS_2, 1021 .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT], 1022 }, 1023 { 1024 .rpc_proc = NULL, 1025 }, 1026 }; 1027 1028 static struct rpcb_info rpcb_next_version6[] = { 1029 { 1030 .rpc_vers = RPCBVERS_4, 1031 .rpc_proc = &rpcb_procedures4[RPCBPROC_GETADDR], 1032 }, 1033 { 1034 .rpc_vers = RPCBVERS_3, 1035 .rpc_proc = &rpcb_procedures3[RPCBPROC_GETADDR], 1036 }, 1037 { 1038 .rpc_proc = NULL, 1039 }, 1040 }; 1041 1042 static struct rpc_version rpcb_version2 = { 1043 .number = RPCBVERS_2, 1044 .nrprocs = RPCB_HIGHPROC_2, 1045 .procs = rpcb_procedures2 1046 }; 1047 1048 static struct rpc_version rpcb_version3 = { 1049 .number = RPCBVERS_3, 1050 .nrprocs = RPCB_HIGHPROC_3, 1051 .procs = rpcb_procedures3 1052 }; 1053 1054 static struct rpc_version rpcb_version4 = { 1055 .number = RPCBVERS_4, 1056 .nrprocs = RPCB_HIGHPROC_4, 1057 .procs = rpcb_procedures4 1058 }; 1059 1060 static struct rpc_version *rpcb_version[] = { 1061 NULL, 1062 NULL, 1063 &rpcb_version2, 1064 &rpcb_version3, 1065 &rpcb_version4 1066 }; 1067 1068 static struct rpc_stat rpcb_stats; 1069 1070 static struct rpc_program rpcb_program = { 1071 .name = "rpcbind", 1072 .number = RPCBIND_PROGRAM, 1073 .nrvers = ARRAY_SIZE(rpcb_version), 1074 .version = rpcb_version, 1075 .stats = &rpcb_stats, 1076 }; 1077 1078 /** 1079 * cleanup_rpcb_clnt - remove xprtsock's sysctls, unregister 1080 * 1081 */ 1082 void cleanup_rpcb_clnt(void) 1083 { 1084 if (rpcb_local_clnt4) 1085 rpc_shutdown_client(rpcb_local_clnt4); 1086 if (rpcb_local_clnt) 1087 rpc_shutdown_client(rpcb_local_clnt); 1088 } 1089