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/un.h> 20 #include <linux/in.h> 21 #include <linux/in6.h> 22 #include <linux/kernel.h> 23 #include <linux/errno.h> 24 #include <linux/mutex.h> 25 #include <linux/slab.h> 26 #include <net/ipv6.h> 27 28 #include <linux/sunrpc/clnt.h> 29 #include <linux/sunrpc/sched.h> 30 #include <linux/sunrpc/xprtsock.h> 31 32 #ifdef RPC_DEBUG 33 # define RPCDBG_FACILITY RPCDBG_BIND 34 #endif 35 36 #define RPCBIND_SOCK_PATHNAME "/var/run/rpcbind.sock" 37 38 #define RPCBIND_PROGRAM (100000u) 39 #define RPCBIND_PORT (111u) 40 41 #define RPCBVERS_2 (2u) 42 #define RPCBVERS_3 (3u) 43 #define RPCBVERS_4 (4u) 44 45 enum { 46 RPCBPROC_NULL, 47 RPCBPROC_SET, 48 RPCBPROC_UNSET, 49 RPCBPROC_GETPORT, 50 RPCBPROC_GETADDR = 3, /* alias for GETPORT */ 51 RPCBPROC_DUMP, 52 RPCBPROC_CALLIT, 53 RPCBPROC_BCAST = 5, /* alias for CALLIT */ 54 RPCBPROC_GETTIME, 55 RPCBPROC_UADDR2TADDR, 56 RPCBPROC_TADDR2UADDR, 57 RPCBPROC_GETVERSADDR, 58 RPCBPROC_INDIRECT, 59 RPCBPROC_GETADDRLIST, 60 RPCBPROC_GETSTAT, 61 }; 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 /* 165 * Returns zero on success, otherwise a negative errno value 166 * is returned. 167 */ 168 static int rpcb_create_local_unix(void) 169 { 170 static const struct sockaddr_un rpcb_localaddr_rpcbind = { 171 .sun_family = AF_LOCAL, 172 .sun_path = RPCBIND_SOCK_PATHNAME, 173 }; 174 struct rpc_create_args args = { 175 .net = &init_net, 176 .protocol = XPRT_TRANSPORT_LOCAL, 177 .address = (struct sockaddr *)&rpcb_localaddr_rpcbind, 178 .addrsize = sizeof(rpcb_localaddr_rpcbind), 179 .servername = "localhost", 180 .program = &rpcb_program, 181 .version = RPCBVERS_2, 182 .authflavor = RPC_AUTH_NULL, 183 }; 184 struct rpc_clnt *clnt, *clnt4; 185 int result = 0; 186 187 /* 188 * Because we requested an RPC PING at transport creation time, 189 * this works only if the user space portmapper is rpcbind, and 190 * it's listening on AF_LOCAL on the named socket. 191 */ 192 clnt = rpc_create(&args); 193 if (IS_ERR(clnt)) { 194 dprintk("RPC: failed to create AF_LOCAL rpcbind " 195 "client (errno %ld).\n", PTR_ERR(clnt)); 196 result = -PTR_ERR(clnt); 197 goto out; 198 } 199 200 clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4); 201 if (IS_ERR(clnt4)) { 202 dprintk("RPC: failed to bind second program to " 203 "rpcbind v4 client (errno %ld).\n", 204 PTR_ERR(clnt4)); 205 clnt4 = NULL; 206 } 207 208 /* Protected by rpcb_create_local_mutex */ 209 rpcb_local_clnt = clnt; 210 rpcb_local_clnt4 = clnt4; 211 212 out: 213 return result; 214 } 215 216 /* 217 * Returns zero on success, otherwise a negative errno value 218 * is returned. 219 */ 220 static int rpcb_create_local_net(void) 221 { 222 static const struct sockaddr_in rpcb_inaddr_loopback = { 223 .sin_family = AF_INET, 224 .sin_addr.s_addr = htonl(INADDR_LOOPBACK), 225 .sin_port = htons(RPCBIND_PORT), 226 }; 227 struct rpc_create_args args = { 228 .net = &init_net, 229 .protocol = XPRT_TRANSPORT_TCP, 230 .address = (struct sockaddr *)&rpcb_inaddr_loopback, 231 .addrsize = sizeof(rpcb_inaddr_loopback), 232 .servername = "localhost", 233 .program = &rpcb_program, 234 .version = RPCBVERS_2, 235 .authflavor = RPC_AUTH_UNIX, 236 .flags = RPC_CLNT_CREATE_NOPING, 237 }; 238 struct rpc_clnt *clnt, *clnt4; 239 int result = 0; 240 241 clnt = rpc_create(&args); 242 if (IS_ERR(clnt)) { 243 dprintk("RPC: failed to create local rpcbind " 244 "client (errno %ld).\n", PTR_ERR(clnt)); 245 result = -PTR_ERR(clnt); 246 goto out; 247 } 248 249 /* 250 * This results in an RPC ping. On systems running portmapper, 251 * the v4 ping will fail. Proceed anyway, but disallow rpcb 252 * v4 upcalls. 253 */ 254 clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4); 255 if (IS_ERR(clnt4)) { 256 dprintk("RPC: failed to bind second program to " 257 "rpcbind v4 client (errno %ld).\n", 258 PTR_ERR(clnt4)); 259 clnt4 = NULL; 260 } 261 262 /* Protected by rpcb_create_local_mutex */ 263 rpcb_local_clnt = clnt; 264 rpcb_local_clnt4 = clnt4; 265 266 out: 267 return result; 268 } 269 270 /* 271 * Returns zero on success, otherwise a negative errno value 272 * is returned. 273 */ 274 static int rpcb_create_local(void) 275 { 276 static DEFINE_MUTEX(rpcb_create_local_mutex); 277 int result = 0; 278 279 if (rpcb_local_clnt) 280 return result; 281 282 mutex_lock(&rpcb_create_local_mutex); 283 if (rpcb_local_clnt) 284 goto out; 285 286 if (rpcb_create_local_unix() != 0) 287 result = rpcb_create_local_net(); 288 289 out: 290 mutex_unlock(&rpcb_create_local_mutex); 291 return result; 292 } 293 294 static struct rpc_clnt *rpcb_create(char *hostname, struct sockaddr *srvaddr, 295 size_t salen, int proto, u32 version) 296 { 297 struct rpc_create_args args = { 298 .net = &init_net, 299 .protocol = proto, 300 .address = srvaddr, 301 .addrsize = salen, 302 .servername = hostname, 303 .program = &rpcb_program, 304 .version = version, 305 .authflavor = RPC_AUTH_UNIX, 306 .flags = (RPC_CLNT_CREATE_NOPING | 307 RPC_CLNT_CREATE_NONPRIVPORT), 308 }; 309 310 switch (srvaddr->sa_family) { 311 case AF_INET: 312 ((struct sockaddr_in *)srvaddr)->sin_port = htons(RPCBIND_PORT); 313 break; 314 case AF_INET6: 315 ((struct sockaddr_in6 *)srvaddr)->sin6_port = htons(RPCBIND_PORT); 316 break; 317 default: 318 return ERR_PTR(-EAFNOSUPPORT); 319 } 320 321 return rpc_create(&args); 322 } 323 324 static int rpcb_register_call(struct rpc_clnt *clnt, struct rpc_message *msg) 325 { 326 int result, error = 0; 327 328 msg->rpc_resp = &result; 329 330 error = rpc_call_sync(clnt, msg, RPC_TASK_SOFTCONN); 331 if (error < 0) { 332 dprintk("RPC: failed to contact local rpcbind " 333 "server (errno %d).\n", -error); 334 return error; 335 } 336 337 if (!result) 338 return -EACCES; 339 return 0; 340 } 341 342 /** 343 * rpcb_register - set or unset a port registration with the local rpcbind svc 344 * @prog: RPC program number to bind 345 * @vers: RPC version number to bind 346 * @prot: transport protocol to register 347 * @port: port value to register 348 * 349 * Returns zero if the registration request was dispatched successfully 350 * and the rpcbind daemon returned success. Otherwise, returns an errno 351 * value that reflects the nature of the error (request could not be 352 * dispatched, timed out, or rpcbind returned an error). 353 * 354 * RPC services invoke this function to advertise their contact 355 * information via the system's rpcbind daemon. RPC services 356 * invoke this function once for each [program, version, transport] 357 * tuple they wish to advertise. 358 * 359 * Callers may also unregister RPC services that are no longer 360 * available by setting the passed-in port to zero. This removes 361 * all registered transports for [program, version] from the local 362 * rpcbind database. 363 * 364 * This function uses rpcbind protocol version 2 to contact the 365 * local rpcbind daemon. 366 * 367 * Registration works over both AF_INET and AF_INET6, and services 368 * registered via this function are advertised as available for any 369 * address. If the local rpcbind daemon is listening on AF_INET6, 370 * services registered via this function will be advertised on 371 * IN6ADDR_ANY (ie available for all AF_INET and AF_INET6 372 * addresses). 373 */ 374 int rpcb_register(u32 prog, u32 vers, int prot, unsigned short port) 375 { 376 struct rpcbind_args map = { 377 .r_prog = prog, 378 .r_vers = vers, 379 .r_prot = prot, 380 .r_port = port, 381 }; 382 struct rpc_message msg = { 383 .rpc_argp = &map, 384 }; 385 int error; 386 387 error = rpcb_create_local(); 388 if (error) 389 return error; 390 391 dprintk("RPC: %sregistering (%u, %u, %d, %u) with local " 392 "rpcbind\n", (port ? "" : "un"), 393 prog, vers, prot, port); 394 395 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_UNSET]; 396 if (port) 397 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_SET]; 398 399 return rpcb_register_call(rpcb_local_clnt, &msg); 400 } 401 402 /* 403 * Fill in AF_INET family-specific arguments to register 404 */ 405 static int rpcb_register_inet4(const struct sockaddr *sap, 406 struct rpc_message *msg) 407 { 408 const struct sockaddr_in *sin = (const struct sockaddr_in *)sap; 409 struct rpcbind_args *map = msg->rpc_argp; 410 unsigned short port = ntohs(sin->sin_port); 411 int result; 412 413 map->r_addr = rpc_sockaddr2uaddr(sap); 414 415 dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with " 416 "local rpcbind\n", (port ? "" : "un"), 417 map->r_prog, map->r_vers, 418 map->r_addr, map->r_netid); 419 420 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET]; 421 if (port) 422 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET]; 423 424 result = rpcb_register_call(rpcb_local_clnt4, msg); 425 kfree(map->r_addr); 426 return result; 427 } 428 429 /* 430 * Fill in AF_INET6 family-specific arguments to register 431 */ 432 static int rpcb_register_inet6(const struct sockaddr *sap, 433 struct rpc_message *msg) 434 { 435 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sap; 436 struct rpcbind_args *map = msg->rpc_argp; 437 unsigned short port = ntohs(sin6->sin6_port); 438 int result; 439 440 map->r_addr = rpc_sockaddr2uaddr(sap); 441 442 dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with " 443 "local rpcbind\n", (port ? "" : "un"), 444 map->r_prog, map->r_vers, 445 map->r_addr, map->r_netid); 446 447 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET]; 448 if (port) 449 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET]; 450 451 result = rpcb_register_call(rpcb_local_clnt4, msg); 452 kfree(map->r_addr); 453 return result; 454 } 455 456 static int rpcb_unregister_all_protofamilies(struct rpc_message *msg) 457 { 458 struct rpcbind_args *map = msg->rpc_argp; 459 460 dprintk("RPC: unregistering [%u, %u, '%s'] with " 461 "local rpcbind\n", 462 map->r_prog, map->r_vers, map->r_netid); 463 464 map->r_addr = ""; 465 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET]; 466 467 return rpcb_register_call(rpcb_local_clnt4, msg); 468 } 469 470 /** 471 * rpcb_v4_register - set or unset a port registration with the local rpcbind 472 * @program: RPC program number of service to (un)register 473 * @version: RPC version number of service to (un)register 474 * @address: address family, IP address, and port to (un)register 475 * @netid: netid of transport protocol to (un)register 476 * 477 * Returns zero if the registration request was dispatched successfully 478 * and the rpcbind daemon returned success. Otherwise, returns an errno 479 * value that reflects the nature of the error (request could not be 480 * dispatched, timed out, or rpcbind returned an error). 481 * 482 * RPC services invoke this function to advertise their contact 483 * information via the system's rpcbind daemon. RPC services 484 * invoke this function once for each [program, version, address, 485 * netid] tuple they wish to advertise. 486 * 487 * Callers may also unregister RPC services that are registered at a 488 * specific address by setting the port number in @address to zero. 489 * They may unregister all registered protocol families at once for 490 * a service by passing a NULL @address argument. If @netid is "" 491 * then all netids for [program, version, address] are unregistered. 492 * 493 * This function uses rpcbind protocol version 4 to contact the 494 * local rpcbind daemon. The local rpcbind daemon must support 495 * version 4 of the rpcbind protocol in order for these functions 496 * to register a service successfully. 497 * 498 * Supported netids include "udp" and "tcp" for UDP and TCP over 499 * IPv4, and "udp6" and "tcp6" for UDP and TCP over IPv6, 500 * respectively. 501 * 502 * The contents of @address determine the address family and the 503 * port to be registered. The usual practice is to pass INADDR_ANY 504 * as the raw address, but specifying a non-zero address is also 505 * supported by this API if the caller wishes to advertise an RPC 506 * service on a specific network interface. 507 * 508 * Note that passing in INADDR_ANY does not create the same service 509 * registration as IN6ADDR_ANY. The former advertises an RPC 510 * service on any IPv4 address, but not on IPv6. The latter 511 * advertises the service on all IPv4 and IPv6 addresses. 512 */ 513 int rpcb_v4_register(const u32 program, const u32 version, 514 const struct sockaddr *address, const char *netid) 515 { 516 struct rpcbind_args map = { 517 .r_prog = program, 518 .r_vers = version, 519 .r_netid = netid, 520 .r_owner = RPCB_OWNER_STRING, 521 }; 522 struct rpc_message msg = { 523 .rpc_argp = &map, 524 }; 525 int error; 526 527 error = rpcb_create_local(); 528 if (error) 529 return error; 530 if (rpcb_local_clnt4 == NULL) 531 return -EPROTONOSUPPORT; 532 533 if (address == NULL) 534 return rpcb_unregister_all_protofamilies(&msg); 535 536 switch (address->sa_family) { 537 case AF_INET: 538 return rpcb_register_inet4(address, &msg); 539 case AF_INET6: 540 return rpcb_register_inet6(address, &msg); 541 } 542 543 return -EAFNOSUPPORT; 544 } 545 546 static struct rpc_task *rpcb_call_async(struct rpc_clnt *rpcb_clnt, struct rpcbind_args *map, struct rpc_procinfo *proc) 547 { 548 struct rpc_message msg = { 549 .rpc_proc = proc, 550 .rpc_argp = map, 551 .rpc_resp = map, 552 }; 553 struct rpc_task_setup task_setup_data = { 554 .rpc_client = rpcb_clnt, 555 .rpc_message = &msg, 556 .callback_ops = &rpcb_getport_ops, 557 .callback_data = map, 558 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFTCONN, 559 }; 560 561 return rpc_run_task(&task_setup_data); 562 } 563 564 /* 565 * In the case where rpc clients have been cloned, we want to make 566 * sure that we use the program number/version etc of the actual 567 * owner of the xprt. To do so, we walk back up the tree of parents 568 * to find whoever created the transport and/or whoever has the 569 * autobind flag set. 570 */ 571 static struct rpc_clnt *rpcb_find_transport_owner(struct rpc_clnt *clnt) 572 { 573 struct rpc_clnt *parent = clnt->cl_parent; 574 575 while (parent != clnt) { 576 if (parent->cl_xprt != clnt->cl_xprt) 577 break; 578 if (clnt->cl_autobind) 579 break; 580 clnt = parent; 581 parent = parent->cl_parent; 582 } 583 return clnt; 584 } 585 586 /** 587 * rpcb_getport_async - obtain the port for a given RPC service on a given host 588 * @task: task that is waiting for portmapper request 589 * 590 * This one can be called for an ongoing RPC request, and can be used in 591 * an async (rpciod) context. 592 */ 593 void rpcb_getport_async(struct rpc_task *task) 594 { 595 struct rpc_clnt *clnt; 596 struct rpc_procinfo *proc; 597 u32 bind_version; 598 struct rpc_xprt *xprt; 599 struct rpc_clnt *rpcb_clnt; 600 struct rpcbind_args *map; 601 struct rpc_task *child; 602 struct sockaddr_storage addr; 603 struct sockaddr *sap = (struct sockaddr *)&addr; 604 size_t salen; 605 int status; 606 607 clnt = rpcb_find_transport_owner(task->tk_client); 608 xprt = clnt->cl_xprt; 609 610 dprintk("RPC: %5u %s(%s, %u, %u, %d)\n", 611 task->tk_pid, __func__, 612 clnt->cl_server, clnt->cl_prog, clnt->cl_vers, xprt->prot); 613 614 /* Put self on the wait queue to ensure we get notified if 615 * some other task is already attempting to bind the port */ 616 rpc_sleep_on(&xprt->binding, task, NULL); 617 618 if (xprt_test_and_set_binding(xprt)) { 619 dprintk("RPC: %5u %s: waiting for another binder\n", 620 task->tk_pid, __func__); 621 return; 622 } 623 624 /* Someone else may have bound if we slept */ 625 if (xprt_bound(xprt)) { 626 status = 0; 627 dprintk("RPC: %5u %s: already bound\n", 628 task->tk_pid, __func__); 629 goto bailout_nofree; 630 } 631 632 /* Parent transport's destination address */ 633 salen = rpc_peeraddr(clnt, sap, sizeof(addr)); 634 635 /* Don't ever use rpcbind v2 for AF_INET6 requests */ 636 switch (sap->sa_family) { 637 case AF_INET: 638 proc = rpcb_next_version[xprt->bind_index].rpc_proc; 639 bind_version = rpcb_next_version[xprt->bind_index].rpc_vers; 640 break; 641 case AF_INET6: 642 proc = rpcb_next_version6[xprt->bind_index].rpc_proc; 643 bind_version = rpcb_next_version6[xprt->bind_index].rpc_vers; 644 break; 645 default: 646 status = -EAFNOSUPPORT; 647 dprintk("RPC: %5u %s: bad address family\n", 648 task->tk_pid, __func__); 649 goto bailout_nofree; 650 } 651 if (proc == NULL) { 652 xprt->bind_index = 0; 653 status = -EPFNOSUPPORT; 654 dprintk("RPC: %5u %s: no more getport versions available\n", 655 task->tk_pid, __func__); 656 goto bailout_nofree; 657 } 658 659 dprintk("RPC: %5u %s: trying rpcbind version %u\n", 660 task->tk_pid, __func__, bind_version); 661 662 rpcb_clnt = rpcb_create(clnt->cl_server, sap, salen, xprt->prot, 663 bind_version); 664 if (IS_ERR(rpcb_clnt)) { 665 status = PTR_ERR(rpcb_clnt); 666 dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n", 667 task->tk_pid, __func__, PTR_ERR(rpcb_clnt)); 668 goto bailout_nofree; 669 } 670 671 map = kzalloc(sizeof(struct rpcbind_args), GFP_ATOMIC); 672 if (!map) { 673 status = -ENOMEM; 674 dprintk("RPC: %5u %s: no memory available\n", 675 task->tk_pid, __func__); 676 goto bailout_release_client; 677 } 678 map->r_prog = clnt->cl_prog; 679 map->r_vers = clnt->cl_vers; 680 map->r_prot = xprt->prot; 681 map->r_port = 0; 682 map->r_xprt = xprt_get(xprt); 683 map->r_status = -EIO; 684 685 switch (bind_version) { 686 case RPCBVERS_4: 687 case RPCBVERS_3: 688 map->r_netid = rpc_peeraddr2str(clnt, RPC_DISPLAY_NETID); 689 map->r_addr = rpc_sockaddr2uaddr(sap); 690 map->r_owner = ""; 691 break; 692 case RPCBVERS_2: 693 map->r_addr = NULL; 694 break; 695 default: 696 BUG(); 697 } 698 699 child = rpcb_call_async(rpcb_clnt, map, proc); 700 rpc_release_client(rpcb_clnt); 701 if (IS_ERR(child)) { 702 /* rpcb_map_release() has freed the arguments */ 703 dprintk("RPC: %5u %s: rpc_run_task failed\n", 704 task->tk_pid, __func__); 705 return; 706 } 707 708 xprt->stat.bind_count++; 709 rpc_put_task(child); 710 return; 711 712 bailout_release_client: 713 rpc_release_client(rpcb_clnt); 714 bailout_nofree: 715 rpcb_wake_rpcbind_waiters(xprt, status); 716 task->tk_status = status; 717 } 718 EXPORT_SYMBOL_GPL(rpcb_getport_async); 719 720 /* 721 * Rpcbind child task calls this callback via tk_exit. 722 */ 723 static void rpcb_getport_done(struct rpc_task *child, void *data) 724 { 725 struct rpcbind_args *map = data; 726 struct rpc_xprt *xprt = map->r_xprt; 727 int status = child->tk_status; 728 729 /* Garbage reply: retry with a lesser rpcbind version */ 730 if (status == -EIO) 731 status = -EPROTONOSUPPORT; 732 733 /* rpcbind server doesn't support this rpcbind protocol version */ 734 if (status == -EPROTONOSUPPORT) 735 xprt->bind_index++; 736 737 if (status < 0) { 738 /* rpcbind server not available on remote host? */ 739 xprt->ops->set_port(xprt, 0); 740 } else if (map->r_port == 0) { 741 /* Requested RPC service wasn't registered on remote host */ 742 xprt->ops->set_port(xprt, 0); 743 status = -EACCES; 744 } else { 745 /* Succeeded */ 746 xprt->ops->set_port(xprt, map->r_port); 747 xprt_set_bound(xprt); 748 status = 0; 749 } 750 751 dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n", 752 child->tk_pid, status, map->r_port); 753 754 map->r_status = status; 755 } 756 757 /* 758 * XDR functions for rpcbind 759 */ 760 761 static void rpcb_enc_mapping(struct rpc_rqst *req, struct xdr_stream *xdr, 762 const struct rpcbind_args *rpcb) 763 { 764 struct rpc_task *task = req->rq_task; 765 __be32 *p; 766 767 dprintk("RPC: %5u encoding PMAP_%s call (%u, %u, %d, %u)\n", 768 task->tk_pid, task->tk_msg.rpc_proc->p_name, 769 rpcb->r_prog, rpcb->r_vers, rpcb->r_prot, rpcb->r_port); 770 771 p = xdr_reserve_space(xdr, RPCB_mappingargs_sz << 2); 772 *p++ = cpu_to_be32(rpcb->r_prog); 773 *p++ = cpu_to_be32(rpcb->r_vers); 774 *p++ = cpu_to_be32(rpcb->r_prot); 775 *p = cpu_to_be32(rpcb->r_port); 776 } 777 778 static int rpcb_dec_getport(struct rpc_rqst *req, struct xdr_stream *xdr, 779 struct rpcbind_args *rpcb) 780 { 781 struct rpc_task *task = req->rq_task; 782 unsigned long port; 783 __be32 *p; 784 785 rpcb->r_port = 0; 786 787 p = xdr_inline_decode(xdr, 4); 788 if (unlikely(p == NULL)) 789 return -EIO; 790 791 port = be32_to_cpup(p); 792 dprintk("RPC: %5u PMAP_%s result: %lu\n", task->tk_pid, 793 task->tk_msg.rpc_proc->p_name, port); 794 if (unlikely(port > USHRT_MAX)) 795 return -EIO; 796 797 rpcb->r_port = port; 798 return 0; 799 } 800 801 static int rpcb_dec_set(struct rpc_rqst *req, struct xdr_stream *xdr, 802 unsigned int *boolp) 803 { 804 struct rpc_task *task = req->rq_task; 805 __be32 *p; 806 807 p = xdr_inline_decode(xdr, 4); 808 if (unlikely(p == NULL)) 809 return -EIO; 810 811 *boolp = 0; 812 if (*p != xdr_zero) 813 *boolp = 1; 814 815 dprintk("RPC: %5u RPCB_%s call %s\n", 816 task->tk_pid, task->tk_msg.rpc_proc->p_name, 817 (*boolp ? "succeeded" : "failed")); 818 return 0; 819 } 820 821 static void encode_rpcb_string(struct xdr_stream *xdr, const char *string, 822 const u32 maxstrlen) 823 { 824 __be32 *p; 825 u32 len; 826 827 len = strlen(string); 828 BUG_ON(len > maxstrlen); 829 p = xdr_reserve_space(xdr, 4 + len); 830 xdr_encode_opaque(p, string, len); 831 } 832 833 static void rpcb_enc_getaddr(struct rpc_rqst *req, struct xdr_stream *xdr, 834 const struct rpcbind_args *rpcb) 835 { 836 struct rpc_task *task = req->rq_task; 837 __be32 *p; 838 839 dprintk("RPC: %5u encoding RPCB_%s call (%u, %u, '%s', '%s')\n", 840 task->tk_pid, task->tk_msg.rpc_proc->p_name, 841 rpcb->r_prog, rpcb->r_vers, 842 rpcb->r_netid, rpcb->r_addr); 843 844 p = xdr_reserve_space(xdr, (RPCB_program_sz + RPCB_version_sz) << 2); 845 *p++ = cpu_to_be32(rpcb->r_prog); 846 *p = cpu_to_be32(rpcb->r_vers); 847 848 encode_rpcb_string(xdr, rpcb->r_netid, RPCBIND_MAXNETIDLEN); 849 encode_rpcb_string(xdr, rpcb->r_addr, RPCBIND_MAXUADDRLEN); 850 encode_rpcb_string(xdr, rpcb->r_owner, RPCB_MAXOWNERLEN); 851 } 852 853 static int rpcb_dec_getaddr(struct rpc_rqst *req, struct xdr_stream *xdr, 854 struct rpcbind_args *rpcb) 855 { 856 struct sockaddr_storage address; 857 struct sockaddr *sap = (struct sockaddr *)&address; 858 struct rpc_task *task = req->rq_task; 859 __be32 *p; 860 u32 len; 861 862 rpcb->r_port = 0; 863 864 p = xdr_inline_decode(xdr, 4); 865 if (unlikely(p == NULL)) 866 goto out_fail; 867 len = be32_to_cpup(p); 868 869 /* 870 * If the returned universal address is a null string, 871 * the requested RPC service was not registered. 872 */ 873 if (len == 0) { 874 dprintk("RPC: %5u RPCB reply: program not registered\n", 875 task->tk_pid); 876 return 0; 877 } 878 879 if (unlikely(len > RPCBIND_MAXUADDRLEN)) 880 goto out_fail; 881 882 p = xdr_inline_decode(xdr, len); 883 if (unlikely(p == NULL)) 884 goto out_fail; 885 dprintk("RPC: %5u RPCB_%s reply: %s\n", task->tk_pid, 886 task->tk_msg.rpc_proc->p_name, (char *)p); 887 888 if (rpc_uaddr2sockaddr((char *)p, len, sap, sizeof(address)) == 0) 889 goto out_fail; 890 rpcb->r_port = rpc_get_port(sap); 891 892 return 0; 893 894 out_fail: 895 dprintk("RPC: %5u malformed RPCB_%s reply\n", 896 task->tk_pid, task->tk_msg.rpc_proc->p_name); 897 return -EIO; 898 } 899 900 /* 901 * Not all rpcbind procedures described in RFC 1833 are implemented 902 * since the Linux kernel RPC code requires only these. 903 */ 904 905 static struct rpc_procinfo rpcb_procedures2[] = { 906 [RPCBPROC_SET] = { 907 .p_proc = RPCBPROC_SET, 908 .p_encode = (kxdreproc_t)rpcb_enc_mapping, 909 .p_decode = (kxdrdproc_t)rpcb_dec_set, 910 .p_arglen = RPCB_mappingargs_sz, 911 .p_replen = RPCB_setres_sz, 912 .p_statidx = RPCBPROC_SET, 913 .p_timer = 0, 914 .p_name = "SET", 915 }, 916 [RPCBPROC_UNSET] = { 917 .p_proc = RPCBPROC_UNSET, 918 .p_encode = (kxdreproc_t)rpcb_enc_mapping, 919 .p_decode = (kxdrdproc_t)rpcb_dec_set, 920 .p_arglen = RPCB_mappingargs_sz, 921 .p_replen = RPCB_setres_sz, 922 .p_statidx = RPCBPROC_UNSET, 923 .p_timer = 0, 924 .p_name = "UNSET", 925 }, 926 [RPCBPROC_GETPORT] = { 927 .p_proc = RPCBPROC_GETPORT, 928 .p_encode = (kxdreproc_t)rpcb_enc_mapping, 929 .p_decode = (kxdrdproc_t)rpcb_dec_getport, 930 .p_arglen = RPCB_mappingargs_sz, 931 .p_replen = RPCB_getportres_sz, 932 .p_statidx = RPCBPROC_GETPORT, 933 .p_timer = 0, 934 .p_name = "GETPORT", 935 }, 936 }; 937 938 static struct rpc_procinfo rpcb_procedures3[] = { 939 [RPCBPROC_SET] = { 940 .p_proc = RPCBPROC_SET, 941 .p_encode = (kxdreproc_t)rpcb_enc_getaddr, 942 .p_decode = (kxdrdproc_t)rpcb_dec_set, 943 .p_arglen = RPCB_getaddrargs_sz, 944 .p_replen = RPCB_setres_sz, 945 .p_statidx = RPCBPROC_SET, 946 .p_timer = 0, 947 .p_name = "SET", 948 }, 949 [RPCBPROC_UNSET] = { 950 .p_proc = RPCBPROC_UNSET, 951 .p_encode = (kxdreproc_t)rpcb_enc_getaddr, 952 .p_decode = (kxdrdproc_t)rpcb_dec_set, 953 .p_arglen = RPCB_getaddrargs_sz, 954 .p_replen = RPCB_setres_sz, 955 .p_statidx = RPCBPROC_UNSET, 956 .p_timer = 0, 957 .p_name = "UNSET", 958 }, 959 [RPCBPROC_GETADDR] = { 960 .p_proc = RPCBPROC_GETADDR, 961 .p_encode = (kxdreproc_t)rpcb_enc_getaddr, 962 .p_decode = (kxdrdproc_t)rpcb_dec_getaddr, 963 .p_arglen = RPCB_getaddrargs_sz, 964 .p_replen = RPCB_getaddrres_sz, 965 .p_statidx = RPCBPROC_GETADDR, 966 .p_timer = 0, 967 .p_name = "GETADDR", 968 }, 969 }; 970 971 static struct rpc_procinfo rpcb_procedures4[] = { 972 [RPCBPROC_SET] = { 973 .p_proc = RPCBPROC_SET, 974 .p_encode = (kxdreproc_t)rpcb_enc_getaddr, 975 .p_decode = (kxdrdproc_t)rpcb_dec_set, 976 .p_arglen = RPCB_getaddrargs_sz, 977 .p_replen = RPCB_setres_sz, 978 .p_statidx = RPCBPROC_SET, 979 .p_timer = 0, 980 .p_name = "SET", 981 }, 982 [RPCBPROC_UNSET] = { 983 .p_proc = RPCBPROC_UNSET, 984 .p_encode = (kxdreproc_t)rpcb_enc_getaddr, 985 .p_decode = (kxdrdproc_t)rpcb_dec_set, 986 .p_arglen = RPCB_getaddrargs_sz, 987 .p_replen = RPCB_setres_sz, 988 .p_statidx = RPCBPROC_UNSET, 989 .p_timer = 0, 990 .p_name = "UNSET", 991 }, 992 [RPCBPROC_GETADDR] = { 993 .p_proc = RPCBPROC_GETADDR, 994 .p_encode = (kxdreproc_t)rpcb_enc_getaddr, 995 .p_decode = (kxdrdproc_t)rpcb_dec_getaddr, 996 .p_arglen = RPCB_getaddrargs_sz, 997 .p_replen = RPCB_getaddrres_sz, 998 .p_statidx = RPCBPROC_GETADDR, 999 .p_timer = 0, 1000 .p_name = "GETADDR", 1001 }, 1002 }; 1003 1004 static struct rpcb_info rpcb_next_version[] = { 1005 { 1006 .rpc_vers = RPCBVERS_2, 1007 .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT], 1008 }, 1009 { 1010 .rpc_proc = NULL, 1011 }, 1012 }; 1013 1014 static struct rpcb_info rpcb_next_version6[] = { 1015 { 1016 .rpc_vers = RPCBVERS_4, 1017 .rpc_proc = &rpcb_procedures4[RPCBPROC_GETADDR], 1018 }, 1019 { 1020 .rpc_vers = RPCBVERS_3, 1021 .rpc_proc = &rpcb_procedures3[RPCBPROC_GETADDR], 1022 }, 1023 { 1024 .rpc_proc = NULL, 1025 }, 1026 }; 1027 1028 static struct rpc_version rpcb_version2 = { 1029 .number = RPCBVERS_2, 1030 .nrprocs = ARRAY_SIZE(rpcb_procedures2), 1031 .procs = rpcb_procedures2 1032 }; 1033 1034 static struct rpc_version rpcb_version3 = { 1035 .number = RPCBVERS_3, 1036 .nrprocs = ARRAY_SIZE(rpcb_procedures3), 1037 .procs = rpcb_procedures3 1038 }; 1039 1040 static struct rpc_version rpcb_version4 = { 1041 .number = RPCBVERS_4, 1042 .nrprocs = ARRAY_SIZE(rpcb_procedures4), 1043 .procs = rpcb_procedures4 1044 }; 1045 1046 static struct rpc_version *rpcb_version[] = { 1047 NULL, 1048 NULL, 1049 &rpcb_version2, 1050 &rpcb_version3, 1051 &rpcb_version4 1052 }; 1053 1054 static struct rpc_stat rpcb_stats; 1055 1056 static struct rpc_program rpcb_program = { 1057 .name = "rpcbind", 1058 .number = RPCBIND_PROGRAM, 1059 .nrvers = ARRAY_SIZE(rpcb_version), 1060 .version = rpcb_version, 1061 .stats = &rpcb_stats, 1062 }; 1063 1064 /** 1065 * cleanup_rpcb_clnt - remove xprtsock's sysctls, unregister 1066 * 1067 */ 1068 void cleanup_rpcb_clnt(void) 1069 { 1070 if (rpcb_local_clnt4) 1071 rpc_shutdown_client(rpcb_local_clnt4); 1072 if (rpcb_local_clnt) 1073 rpc_shutdown_client(rpcb_local_clnt); 1074 } 1075