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 /* 61 * r_owner 62 * 63 * The "owner" is allowed to unset a service in the rpcbind database. 64 * 65 * For AF_LOCAL SET/UNSET requests, rpcbind treats this string as a 66 * UID which it maps to a local user name via a password lookup. 67 * In all other cases it is ignored. 68 * 69 * For SET/UNSET requests, user space provides a value, even for 70 * network requests, and GETADDR uses an empty string. We follow 71 * those precedents here. 72 */ 73 #define RPCB_OWNER_STRING "0" 74 #define RPCB_MAXOWNERLEN sizeof(RPCB_OWNER_STRING) 75 76 /* 77 * XDR data type sizes 78 */ 79 #define RPCB_program_sz (1) 80 #define RPCB_version_sz (1) 81 #define RPCB_protocol_sz (1) 82 #define RPCB_port_sz (1) 83 #define RPCB_boolean_sz (1) 84 85 #define RPCB_netid_sz (1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN)) 86 #define RPCB_addr_sz (1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN)) 87 #define RPCB_ownerstring_sz (1 + XDR_QUADLEN(RPCB_MAXOWNERLEN)) 88 89 /* 90 * XDR argument and result sizes 91 */ 92 #define RPCB_mappingargs_sz (RPCB_program_sz + RPCB_version_sz + \ 93 RPCB_protocol_sz + RPCB_port_sz) 94 #define RPCB_getaddrargs_sz (RPCB_program_sz + RPCB_version_sz + \ 95 RPCB_netid_sz + RPCB_addr_sz + \ 96 RPCB_ownerstring_sz) 97 98 #define RPCB_getportres_sz RPCB_port_sz 99 #define RPCB_setres_sz RPCB_boolean_sz 100 101 /* 102 * Note that RFC 1833 does not put any size restrictions on the 103 * address string returned by the remote rpcbind database. 104 */ 105 #define RPCB_getaddrres_sz RPCB_addr_sz 106 107 static void rpcb_getport_done(struct rpc_task *, void *); 108 static void rpcb_map_release(void *data); 109 static struct rpc_program rpcb_program; 110 111 static struct rpc_clnt * rpcb_local_clnt; 112 static struct rpc_clnt * rpcb_local_clnt4; 113 114 struct rpcbind_args { 115 struct rpc_xprt * r_xprt; 116 117 u32 r_prog; 118 u32 r_vers; 119 u32 r_prot; 120 unsigned short r_port; 121 const char * r_netid; 122 const char * r_addr; 123 const char * r_owner; 124 125 int r_status; 126 }; 127 128 static struct rpc_procinfo rpcb_procedures2[]; 129 static struct rpc_procinfo rpcb_procedures3[]; 130 static struct rpc_procinfo rpcb_procedures4[]; 131 132 struct rpcb_info { 133 u32 rpc_vers; 134 struct rpc_procinfo * rpc_proc; 135 }; 136 137 static struct rpcb_info rpcb_next_version[]; 138 static struct rpcb_info rpcb_next_version6[]; 139 140 static const struct rpc_call_ops rpcb_getport_ops = { 141 .rpc_call_done = rpcb_getport_done, 142 .rpc_release = rpcb_map_release, 143 }; 144 145 static void rpcb_wake_rpcbind_waiters(struct rpc_xprt *xprt, int status) 146 { 147 xprt_clear_binding(xprt); 148 rpc_wake_up_status(&xprt->binding, status); 149 } 150 151 static void rpcb_map_release(void *data) 152 { 153 struct rpcbind_args *map = data; 154 155 rpcb_wake_rpcbind_waiters(map->r_xprt, map->r_status); 156 xprt_put(map->r_xprt); 157 kfree(map->r_addr); 158 kfree(map); 159 } 160 161 static const struct sockaddr_in rpcb_inaddr_loopback = { 162 .sin_family = AF_INET, 163 .sin_addr.s_addr = htonl(INADDR_LOOPBACK), 164 .sin_port = htons(RPCBIND_PORT), 165 }; 166 167 static DEFINE_MUTEX(rpcb_create_local_mutex); 168 169 /* 170 * Returns zero on success, otherwise a negative errno value 171 * is returned. 172 */ 173 static int rpcb_create_local(void) 174 { 175 struct rpc_create_args args = { 176 .net = &init_net, 177 .protocol = XPRT_TRANSPORT_TCP, 178 .address = (struct sockaddr *)&rpcb_inaddr_loopback, 179 .addrsize = sizeof(rpcb_inaddr_loopback), 180 .servername = "localhost", 181 .program = &rpcb_program, 182 .version = RPCBVERS_2, 183 .authflavor = RPC_AUTH_UNIX, 184 .flags = RPC_CLNT_CREATE_NOPING, 185 }; 186 struct rpc_clnt *clnt, *clnt4; 187 int result = 0; 188 189 if (rpcb_local_clnt) 190 return result; 191 192 mutex_lock(&rpcb_create_local_mutex); 193 if (rpcb_local_clnt) 194 goto out; 195 196 clnt = rpc_create(&args); 197 if (IS_ERR(clnt)) { 198 dprintk("RPC: failed to create local rpcbind " 199 "client (errno %ld).\n", PTR_ERR(clnt)); 200 result = -PTR_ERR(clnt); 201 goto out; 202 } 203 204 /* 205 * This results in an RPC ping. On systems running portmapper, 206 * the v4 ping will fail. Proceed anyway, but disallow rpcb 207 * v4 upcalls. 208 */ 209 clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4); 210 if (IS_ERR(clnt4)) { 211 dprintk("RPC: failed to bind second program to " 212 "rpcbind v4 client (errno %ld).\n", 213 PTR_ERR(clnt4)); 214 clnt4 = NULL; 215 } 216 217 rpcb_local_clnt = clnt; 218 rpcb_local_clnt4 = clnt4; 219 220 out: 221 mutex_unlock(&rpcb_create_local_mutex); 222 return result; 223 } 224 225 static struct rpc_clnt *rpcb_create(char *hostname, struct sockaddr *srvaddr, 226 size_t salen, int proto, u32 version) 227 { 228 struct rpc_create_args args = { 229 .net = &init_net, 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 ERR_PTR(-EAFNOSUPPORT); 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 static struct rpc_task *rpcb_call_async(struct rpc_clnt *rpcb_clnt, struct rpcbind_args *map, struct rpc_procinfo *proc) 478 { 479 struct rpc_message msg = { 480 .rpc_proc = proc, 481 .rpc_argp = map, 482 .rpc_resp = map, 483 }; 484 struct rpc_task_setup task_setup_data = { 485 .rpc_client = rpcb_clnt, 486 .rpc_message = &msg, 487 .callback_ops = &rpcb_getport_ops, 488 .callback_data = map, 489 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFTCONN, 490 }; 491 492 return rpc_run_task(&task_setup_data); 493 } 494 495 /* 496 * In the case where rpc clients have been cloned, we want to make 497 * sure that we use the program number/version etc of the actual 498 * owner of the xprt. To do so, we walk back up the tree of parents 499 * to find whoever created the transport and/or whoever has the 500 * autobind flag set. 501 */ 502 static struct rpc_clnt *rpcb_find_transport_owner(struct rpc_clnt *clnt) 503 { 504 struct rpc_clnt *parent = clnt->cl_parent; 505 506 while (parent != clnt) { 507 if (parent->cl_xprt != clnt->cl_xprt) 508 break; 509 if (clnt->cl_autobind) 510 break; 511 clnt = parent; 512 parent = parent->cl_parent; 513 } 514 return clnt; 515 } 516 517 /** 518 * rpcb_getport_async - obtain the port for a given RPC service on a given host 519 * @task: task that is waiting for portmapper request 520 * 521 * This one can be called for an ongoing RPC request, and can be used in 522 * an async (rpciod) context. 523 */ 524 void rpcb_getport_async(struct rpc_task *task) 525 { 526 struct rpc_clnt *clnt; 527 struct rpc_procinfo *proc; 528 u32 bind_version; 529 struct rpc_xprt *xprt; 530 struct rpc_clnt *rpcb_clnt; 531 static struct rpcbind_args *map; 532 struct rpc_task *child; 533 struct sockaddr_storage addr; 534 struct sockaddr *sap = (struct sockaddr *)&addr; 535 size_t salen; 536 int status; 537 538 clnt = rpcb_find_transport_owner(task->tk_client); 539 xprt = clnt->cl_xprt; 540 541 dprintk("RPC: %5u %s(%s, %u, %u, %d)\n", 542 task->tk_pid, __func__, 543 clnt->cl_server, clnt->cl_prog, clnt->cl_vers, xprt->prot); 544 545 /* Put self on the wait queue to ensure we get notified if 546 * some other task is already attempting to bind the port */ 547 rpc_sleep_on(&xprt->binding, task, NULL); 548 549 if (xprt_test_and_set_binding(xprt)) { 550 dprintk("RPC: %5u %s: waiting for another binder\n", 551 task->tk_pid, __func__); 552 return; 553 } 554 555 /* Someone else may have bound if we slept */ 556 if (xprt_bound(xprt)) { 557 status = 0; 558 dprintk("RPC: %5u %s: already bound\n", 559 task->tk_pid, __func__); 560 goto bailout_nofree; 561 } 562 563 /* Parent transport's destination address */ 564 salen = rpc_peeraddr(clnt, sap, sizeof(addr)); 565 566 /* Don't ever use rpcbind v2 for AF_INET6 requests */ 567 switch (sap->sa_family) { 568 case AF_INET: 569 proc = rpcb_next_version[xprt->bind_index].rpc_proc; 570 bind_version = rpcb_next_version[xprt->bind_index].rpc_vers; 571 break; 572 case AF_INET6: 573 proc = rpcb_next_version6[xprt->bind_index].rpc_proc; 574 bind_version = rpcb_next_version6[xprt->bind_index].rpc_vers; 575 break; 576 default: 577 status = -EAFNOSUPPORT; 578 dprintk("RPC: %5u %s: bad address family\n", 579 task->tk_pid, __func__); 580 goto bailout_nofree; 581 } 582 if (proc == NULL) { 583 xprt->bind_index = 0; 584 status = -EPFNOSUPPORT; 585 dprintk("RPC: %5u %s: no more getport versions available\n", 586 task->tk_pid, __func__); 587 goto bailout_nofree; 588 } 589 590 dprintk("RPC: %5u %s: trying rpcbind version %u\n", 591 task->tk_pid, __func__, bind_version); 592 593 rpcb_clnt = rpcb_create(clnt->cl_server, sap, salen, xprt->prot, 594 bind_version); 595 if (IS_ERR(rpcb_clnt)) { 596 status = PTR_ERR(rpcb_clnt); 597 dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n", 598 task->tk_pid, __func__, PTR_ERR(rpcb_clnt)); 599 goto bailout_nofree; 600 } 601 602 map = kzalloc(sizeof(struct rpcbind_args), GFP_ATOMIC); 603 if (!map) { 604 status = -ENOMEM; 605 dprintk("RPC: %5u %s: no memory available\n", 606 task->tk_pid, __func__); 607 goto bailout_release_client; 608 } 609 map->r_prog = clnt->cl_prog; 610 map->r_vers = clnt->cl_vers; 611 map->r_prot = xprt->prot; 612 map->r_port = 0; 613 map->r_xprt = xprt_get(xprt); 614 map->r_status = -EIO; 615 616 switch (bind_version) { 617 case RPCBVERS_4: 618 case RPCBVERS_3: 619 map->r_netid = rpc_peeraddr2str(clnt, RPC_DISPLAY_NETID); 620 map->r_addr = rpc_sockaddr2uaddr(sap); 621 map->r_owner = ""; 622 break; 623 case RPCBVERS_2: 624 map->r_addr = NULL; 625 break; 626 default: 627 BUG(); 628 } 629 630 child = rpcb_call_async(rpcb_clnt, map, proc); 631 rpc_release_client(rpcb_clnt); 632 if (IS_ERR(child)) { 633 /* rpcb_map_release() has freed the arguments */ 634 dprintk("RPC: %5u %s: rpc_run_task failed\n", 635 task->tk_pid, __func__); 636 return; 637 } 638 639 xprt->stat.bind_count++; 640 rpc_put_task(child); 641 return; 642 643 bailout_release_client: 644 rpc_release_client(rpcb_clnt); 645 bailout_nofree: 646 rpcb_wake_rpcbind_waiters(xprt, status); 647 task->tk_status = status; 648 } 649 EXPORT_SYMBOL_GPL(rpcb_getport_async); 650 651 /* 652 * Rpcbind child task calls this callback via tk_exit. 653 */ 654 static void rpcb_getport_done(struct rpc_task *child, void *data) 655 { 656 struct rpcbind_args *map = data; 657 struct rpc_xprt *xprt = map->r_xprt; 658 int status = child->tk_status; 659 660 /* Garbage reply: retry with a lesser rpcbind version */ 661 if (status == -EIO) 662 status = -EPROTONOSUPPORT; 663 664 /* rpcbind server doesn't support this rpcbind protocol version */ 665 if (status == -EPROTONOSUPPORT) 666 xprt->bind_index++; 667 668 if (status < 0) { 669 /* rpcbind server not available on remote host? */ 670 xprt->ops->set_port(xprt, 0); 671 } else if (map->r_port == 0) { 672 /* Requested RPC service wasn't registered on remote host */ 673 xprt->ops->set_port(xprt, 0); 674 status = -EACCES; 675 } else { 676 /* Succeeded */ 677 xprt->ops->set_port(xprt, map->r_port); 678 xprt_set_bound(xprt); 679 status = 0; 680 } 681 682 dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n", 683 child->tk_pid, status, map->r_port); 684 685 map->r_status = status; 686 } 687 688 /* 689 * XDR functions for rpcbind 690 */ 691 692 static void rpcb_enc_mapping(struct rpc_rqst *req, struct xdr_stream *xdr, 693 const struct rpcbind_args *rpcb) 694 { 695 struct rpc_task *task = req->rq_task; 696 __be32 *p; 697 698 dprintk("RPC: %5u encoding PMAP_%s call (%u, %u, %d, %u)\n", 699 task->tk_pid, task->tk_msg.rpc_proc->p_name, 700 rpcb->r_prog, rpcb->r_vers, rpcb->r_prot, rpcb->r_port); 701 702 p = xdr_reserve_space(xdr, RPCB_mappingargs_sz << 2); 703 *p++ = cpu_to_be32(rpcb->r_prog); 704 *p++ = cpu_to_be32(rpcb->r_vers); 705 *p++ = cpu_to_be32(rpcb->r_prot); 706 *p = cpu_to_be32(rpcb->r_port); 707 } 708 709 static int rpcb_dec_getport(struct rpc_rqst *req, struct xdr_stream *xdr, 710 struct rpcbind_args *rpcb) 711 { 712 struct rpc_task *task = req->rq_task; 713 unsigned long port; 714 __be32 *p; 715 716 rpcb->r_port = 0; 717 718 p = xdr_inline_decode(xdr, 4); 719 if (unlikely(p == NULL)) 720 return -EIO; 721 722 port = be32_to_cpup(p); 723 dprintk("RPC: %5u PMAP_%s result: %lu\n", task->tk_pid, 724 task->tk_msg.rpc_proc->p_name, port); 725 if (unlikely(port > USHRT_MAX)) 726 return -EIO; 727 728 rpcb->r_port = port; 729 return 0; 730 } 731 732 static int rpcb_dec_set(struct rpc_rqst *req, struct xdr_stream *xdr, 733 unsigned int *boolp) 734 { 735 struct rpc_task *task = req->rq_task; 736 __be32 *p; 737 738 p = xdr_inline_decode(xdr, 4); 739 if (unlikely(p == NULL)) 740 return -EIO; 741 742 *boolp = 0; 743 if (*p != xdr_zero) 744 *boolp = 1; 745 746 dprintk("RPC: %5u RPCB_%s call %s\n", 747 task->tk_pid, task->tk_msg.rpc_proc->p_name, 748 (*boolp ? "succeeded" : "failed")); 749 return 0; 750 } 751 752 static void encode_rpcb_string(struct xdr_stream *xdr, const char *string, 753 const u32 maxstrlen) 754 { 755 __be32 *p; 756 u32 len; 757 758 len = strlen(string); 759 BUG_ON(len > maxstrlen); 760 p = xdr_reserve_space(xdr, 4 + len); 761 xdr_encode_opaque(p, string, len); 762 } 763 764 static void rpcb_enc_getaddr(struct rpc_rqst *req, struct xdr_stream *xdr, 765 const struct rpcbind_args *rpcb) 766 { 767 struct rpc_task *task = req->rq_task; 768 __be32 *p; 769 770 dprintk("RPC: %5u encoding RPCB_%s call (%u, %u, '%s', '%s')\n", 771 task->tk_pid, task->tk_msg.rpc_proc->p_name, 772 rpcb->r_prog, rpcb->r_vers, 773 rpcb->r_netid, rpcb->r_addr); 774 775 p = xdr_reserve_space(xdr, (RPCB_program_sz + RPCB_version_sz) << 2); 776 *p++ = cpu_to_be32(rpcb->r_prog); 777 *p = cpu_to_be32(rpcb->r_vers); 778 779 encode_rpcb_string(xdr, rpcb->r_netid, RPCBIND_MAXNETIDLEN); 780 encode_rpcb_string(xdr, rpcb->r_addr, RPCBIND_MAXUADDRLEN); 781 encode_rpcb_string(xdr, rpcb->r_owner, RPCB_MAXOWNERLEN); 782 } 783 784 static int rpcb_dec_getaddr(struct rpc_rqst *req, struct xdr_stream *xdr, 785 struct rpcbind_args *rpcb) 786 { 787 struct sockaddr_storage address; 788 struct sockaddr *sap = (struct sockaddr *)&address; 789 struct rpc_task *task = req->rq_task; 790 __be32 *p; 791 u32 len; 792 793 rpcb->r_port = 0; 794 795 p = xdr_inline_decode(xdr, 4); 796 if (unlikely(p == NULL)) 797 goto out_fail; 798 len = be32_to_cpup(p); 799 800 /* 801 * If the returned universal address is a null string, 802 * the requested RPC service was not registered. 803 */ 804 if (len == 0) { 805 dprintk("RPC: %5u RPCB reply: program not registered\n", 806 task->tk_pid); 807 return 0; 808 } 809 810 if (unlikely(len > RPCBIND_MAXUADDRLEN)) 811 goto out_fail; 812 813 p = xdr_inline_decode(xdr, len); 814 if (unlikely(p == NULL)) 815 goto out_fail; 816 dprintk("RPC: %5u RPCB_%s reply: %s\n", task->tk_pid, 817 task->tk_msg.rpc_proc->p_name, (char *)p); 818 819 if (rpc_uaddr2sockaddr((char *)p, len, sap, sizeof(address)) == 0) 820 goto out_fail; 821 rpcb->r_port = rpc_get_port(sap); 822 823 return 0; 824 825 out_fail: 826 dprintk("RPC: %5u malformed RPCB_%s reply\n", 827 task->tk_pid, task->tk_msg.rpc_proc->p_name); 828 return -EIO; 829 } 830 831 /* 832 * Not all rpcbind procedures described in RFC 1833 are implemented 833 * since the Linux kernel RPC code requires only these. 834 */ 835 836 static struct rpc_procinfo rpcb_procedures2[] = { 837 [RPCBPROC_SET] = { 838 .p_proc = RPCBPROC_SET, 839 .p_encode = (kxdreproc_t)rpcb_enc_mapping, 840 .p_decode = (kxdrdproc_t)rpcb_dec_set, 841 .p_arglen = RPCB_mappingargs_sz, 842 .p_replen = RPCB_setres_sz, 843 .p_statidx = RPCBPROC_SET, 844 .p_timer = 0, 845 .p_name = "SET", 846 }, 847 [RPCBPROC_UNSET] = { 848 .p_proc = RPCBPROC_UNSET, 849 .p_encode = (kxdreproc_t)rpcb_enc_mapping, 850 .p_decode = (kxdrdproc_t)rpcb_dec_set, 851 .p_arglen = RPCB_mappingargs_sz, 852 .p_replen = RPCB_setres_sz, 853 .p_statidx = RPCBPROC_UNSET, 854 .p_timer = 0, 855 .p_name = "UNSET", 856 }, 857 [RPCBPROC_GETPORT] = { 858 .p_proc = RPCBPROC_GETPORT, 859 .p_encode = (kxdreproc_t)rpcb_enc_mapping, 860 .p_decode = (kxdrdproc_t)rpcb_dec_getport, 861 .p_arglen = RPCB_mappingargs_sz, 862 .p_replen = RPCB_getportres_sz, 863 .p_statidx = RPCBPROC_GETPORT, 864 .p_timer = 0, 865 .p_name = "GETPORT", 866 }, 867 }; 868 869 static struct rpc_procinfo rpcb_procedures3[] = { 870 [RPCBPROC_SET] = { 871 .p_proc = RPCBPROC_SET, 872 .p_encode = (kxdreproc_t)rpcb_enc_getaddr, 873 .p_decode = (kxdrdproc_t)rpcb_dec_set, 874 .p_arglen = RPCB_getaddrargs_sz, 875 .p_replen = RPCB_setres_sz, 876 .p_statidx = RPCBPROC_SET, 877 .p_timer = 0, 878 .p_name = "SET", 879 }, 880 [RPCBPROC_UNSET] = { 881 .p_proc = RPCBPROC_UNSET, 882 .p_encode = (kxdreproc_t)rpcb_enc_getaddr, 883 .p_decode = (kxdrdproc_t)rpcb_dec_set, 884 .p_arglen = RPCB_getaddrargs_sz, 885 .p_replen = RPCB_setres_sz, 886 .p_statidx = RPCBPROC_UNSET, 887 .p_timer = 0, 888 .p_name = "UNSET", 889 }, 890 [RPCBPROC_GETADDR] = { 891 .p_proc = RPCBPROC_GETADDR, 892 .p_encode = (kxdreproc_t)rpcb_enc_getaddr, 893 .p_decode = (kxdrdproc_t)rpcb_dec_getaddr, 894 .p_arglen = RPCB_getaddrargs_sz, 895 .p_replen = RPCB_getaddrres_sz, 896 .p_statidx = RPCBPROC_GETADDR, 897 .p_timer = 0, 898 .p_name = "GETADDR", 899 }, 900 }; 901 902 static struct rpc_procinfo rpcb_procedures4[] = { 903 [RPCBPROC_SET] = { 904 .p_proc = RPCBPROC_SET, 905 .p_encode = (kxdreproc_t)rpcb_enc_getaddr, 906 .p_decode = (kxdrdproc_t)rpcb_dec_set, 907 .p_arglen = RPCB_getaddrargs_sz, 908 .p_replen = RPCB_setres_sz, 909 .p_statidx = RPCBPROC_SET, 910 .p_timer = 0, 911 .p_name = "SET", 912 }, 913 [RPCBPROC_UNSET] = { 914 .p_proc = RPCBPROC_UNSET, 915 .p_encode = (kxdreproc_t)rpcb_enc_getaddr, 916 .p_decode = (kxdrdproc_t)rpcb_dec_set, 917 .p_arglen = RPCB_getaddrargs_sz, 918 .p_replen = RPCB_setres_sz, 919 .p_statidx = RPCBPROC_UNSET, 920 .p_timer = 0, 921 .p_name = "UNSET", 922 }, 923 [RPCBPROC_GETADDR] = { 924 .p_proc = RPCBPROC_GETADDR, 925 .p_encode = (kxdreproc_t)rpcb_enc_getaddr, 926 .p_decode = (kxdrdproc_t)rpcb_dec_getaddr, 927 .p_arglen = RPCB_getaddrargs_sz, 928 .p_replen = RPCB_getaddrres_sz, 929 .p_statidx = RPCBPROC_GETADDR, 930 .p_timer = 0, 931 .p_name = "GETADDR", 932 }, 933 }; 934 935 static struct rpcb_info rpcb_next_version[] = { 936 { 937 .rpc_vers = RPCBVERS_2, 938 .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT], 939 }, 940 { 941 .rpc_proc = NULL, 942 }, 943 }; 944 945 static struct rpcb_info rpcb_next_version6[] = { 946 { 947 .rpc_vers = RPCBVERS_4, 948 .rpc_proc = &rpcb_procedures4[RPCBPROC_GETADDR], 949 }, 950 { 951 .rpc_vers = RPCBVERS_3, 952 .rpc_proc = &rpcb_procedures3[RPCBPROC_GETADDR], 953 }, 954 { 955 .rpc_proc = NULL, 956 }, 957 }; 958 959 static struct rpc_version rpcb_version2 = { 960 .number = RPCBVERS_2, 961 .nrprocs = ARRAY_SIZE(rpcb_procedures2), 962 .procs = rpcb_procedures2 963 }; 964 965 static struct rpc_version rpcb_version3 = { 966 .number = RPCBVERS_3, 967 .nrprocs = ARRAY_SIZE(rpcb_procedures3), 968 .procs = rpcb_procedures3 969 }; 970 971 static struct rpc_version rpcb_version4 = { 972 .number = RPCBVERS_4, 973 .nrprocs = ARRAY_SIZE(rpcb_procedures4), 974 .procs = rpcb_procedures4 975 }; 976 977 static struct rpc_version *rpcb_version[] = { 978 NULL, 979 NULL, 980 &rpcb_version2, 981 &rpcb_version3, 982 &rpcb_version4 983 }; 984 985 static struct rpc_stat rpcb_stats; 986 987 static struct rpc_program rpcb_program = { 988 .name = "rpcbind", 989 .number = RPCBIND_PROGRAM, 990 .nrvers = ARRAY_SIZE(rpcb_version), 991 .version = rpcb_version, 992 .stats = &rpcb_stats, 993 }; 994 995 /** 996 * cleanup_rpcb_clnt - remove xprtsock's sysctls, unregister 997 * 998 */ 999 void cleanup_rpcb_clnt(void) 1000 { 1001 if (rpcb_local_clnt4) 1002 rpc_shutdown_client(rpcb_local_clnt4); 1003 if (rpcb_local_clnt) 1004 rpc_shutdown_client(rpcb_local_clnt); 1005 } 1006