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 <net/ipv6.h> 24 25 #include <linux/sunrpc/clnt.h> 26 #include <linux/sunrpc/sched.h> 27 #include <linux/sunrpc/xprtsock.h> 28 29 #ifdef RPC_DEBUG 30 # define RPCDBG_FACILITY RPCDBG_BIND 31 #endif 32 33 #define RPCBIND_PROGRAM (100000u) 34 #define RPCBIND_PORT (111u) 35 36 #define RPCBVERS_2 (2u) 37 #define RPCBVERS_3 (3u) 38 #define RPCBVERS_4 (4u) 39 40 enum { 41 RPCBPROC_NULL, 42 RPCBPROC_SET, 43 RPCBPROC_UNSET, 44 RPCBPROC_GETPORT, 45 RPCBPROC_GETADDR = 3, /* alias for GETPORT */ 46 RPCBPROC_DUMP, 47 RPCBPROC_CALLIT, 48 RPCBPROC_BCAST = 5, /* alias for CALLIT */ 49 RPCBPROC_GETTIME, 50 RPCBPROC_UADDR2TADDR, 51 RPCBPROC_TADDR2UADDR, 52 RPCBPROC_GETVERSADDR, 53 RPCBPROC_INDIRECT, 54 RPCBPROC_GETADDRLIST, 55 RPCBPROC_GETSTAT, 56 }; 57 58 #define RPCB_HIGHPROC_2 RPCBPROC_CALLIT 59 #define RPCB_HIGHPROC_3 RPCBPROC_TADDR2UADDR 60 #define RPCB_HIGHPROC_4 RPCBPROC_GETSTAT 61 62 /* 63 * r_owner 64 * 65 * The "owner" is allowed to unset a service in the rpcbind database. 66 * 67 * For AF_LOCAL SET/UNSET requests, rpcbind treats this string as a 68 * UID which it maps to a local user name via a password lookup. 69 * In all other cases it is ignored. 70 * 71 * For SET/UNSET requests, user space provides a value, even for 72 * network requests, and GETADDR uses an empty string. We follow 73 * those precedents here. 74 */ 75 #define RPCB_OWNER_STRING "0" 76 #define RPCB_MAXOWNERLEN sizeof(RPCB_OWNER_STRING) 77 78 static void rpcb_getport_done(struct rpc_task *, void *); 79 static void rpcb_map_release(void *data); 80 static struct rpc_program rpcb_program; 81 82 struct rpcbind_args { 83 struct rpc_xprt * r_xprt; 84 85 u32 r_prog; 86 u32 r_vers; 87 u32 r_prot; 88 unsigned short r_port; 89 const char * r_netid; 90 const char * r_addr; 91 const char * r_owner; 92 93 int r_status; 94 }; 95 96 static struct rpc_procinfo rpcb_procedures2[]; 97 static struct rpc_procinfo rpcb_procedures3[]; 98 static struct rpc_procinfo rpcb_procedures4[]; 99 100 struct rpcb_info { 101 u32 rpc_vers; 102 struct rpc_procinfo * rpc_proc; 103 }; 104 105 static struct rpcb_info rpcb_next_version[]; 106 static struct rpcb_info rpcb_next_version6[]; 107 108 static const struct rpc_call_ops rpcb_getport_ops = { 109 .rpc_call_done = rpcb_getport_done, 110 .rpc_release = rpcb_map_release, 111 }; 112 113 static void rpcb_wake_rpcbind_waiters(struct rpc_xprt *xprt, int status) 114 { 115 xprt_clear_binding(xprt); 116 rpc_wake_up_status(&xprt->binding, status); 117 } 118 119 static void rpcb_map_release(void *data) 120 { 121 struct rpcbind_args *map = data; 122 123 rpcb_wake_rpcbind_waiters(map->r_xprt, map->r_status); 124 xprt_put(map->r_xprt); 125 kfree(map); 126 } 127 128 static const struct sockaddr_in rpcb_inaddr_loopback = { 129 .sin_family = AF_INET, 130 .sin_addr.s_addr = htonl(INADDR_LOOPBACK), 131 .sin_port = htons(RPCBIND_PORT), 132 }; 133 134 static struct rpc_clnt *rpcb_create_local(struct sockaddr *addr, 135 size_t addrlen, u32 version) 136 { 137 struct rpc_create_args args = { 138 .protocol = XPRT_TRANSPORT_UDP, 139 .address = addr, 140 .addrsize = addrlen, 141 .servername = "localhost", 142 .program = &rpcb_program, 143 .version = version, 144 .authflavor = RPC_AUTH_UNIX, 145 .flags = RPC_CLNT_CREATE_NOPING, 146 }; 147 148 return rpc_create(&args); 149 } 150 151 static struct rpc_clnt *rpcb_create(char *hostname, struct sockaddr *srvaddr, 152 size_t salen, int proto, u32 version) 153 { 154 struct rpc_create_args args = { 155 .protocol = proto, 156 .address = srvaddr, 157 .addrsize = salen, 158 .servername = hostname, 159 .program = &rpcb_program, 160 .version = version, 161 .authflavor = RPC_AUTH_UNIX, 162 .flags = (RPC_CLNT_CREATE_NOPING | 163 RPC_CLNT_CREATE_NONPRIVPORT), 164 }; 165 166 switch (srvaddr->sa_family) { 167 case AF_INET: 168 ((struct sockaddr_in *)srvaddr)->sin_port = htons(RPCBIND_PORT); 169 break; 170 case AF_INET6: 171 ((struct sockaddr_in6 *)srvaddr)->sin6_port = htons(RPCBIND_PORT); 172 break; 173 default: 174 return NULL; 175 } 176 177 return rpc_create(&args); 178 } 179 180 static int rpcb_register_call(const u32 version, struct rpc_message *msg) 181 { 182 struct sockaddr *addr = (struct sockaddr *)&rpcb_inaddr_loopback; 183 size_t addrlen = sizeof(rpcb_inaddr_loopback); 184 struct rpc_clnt *rpcb_clnt; 185 int result, error = 0; 186 187 msg->rpc_resp = &result; 188 189 rpcb_clnt = rpcb_create_local(addr, addrlen, version); 190 if (!IS_ERR(rpcb_clnt)) { 191 error = rpc_call_sync(rpcb_clnt, msg, 0); 192 rpc_shutdown_client(rpcb_clnt); 193 } else 194 error = PTR_ERR(rpcb_clnt); 195 196 if (error < 0) { 197 dprintk("RPC: failed to contact local rpcbind " 198 "server (errno %d).\n", -error); 199 return error; 200 } 201 202 if (!result) 203 return -EACCES; 204 return 0; 205 } 206 207 /** 208 * rpcb_register - set or unset a port registration with the local rpcbind svc 209 * @prog: RPC program number to bind 210 * @vers: RPC version number to bind 211 * @prot: transport protocol to register 212 * @port: port value to register 213 * 214 * Returns zero if the registration request was dispatched successfully 215 * and the rpcbind daemon returned success. Otherwise, returns an errno 216 * value that reflects the nature of the error (request could not be 217 * dispatched, timed out, or rpcbind returned an error). 218 * 219 * RPC services invoke this function to advertise their contact 220 * information via the system's rpcbind daemon. RPC services 221 * invoke this function once for each [program, version, transport] 222 * tuple they wish to advertise. 223 * 224 * Callers may also unregister RPC services that are no longer 225 * available by setting the passed-in port to zero. This removes 226 * all registered transports for [program, version] from the local 227 * rpcbind database. 228 * 229 * This function uses rpcbind protocol version 2 to contact the 230 * local rpcbind daemon. 231 * 232 * Registration works over both AF_INET and AF_INET6, and services 233 * registered via this function are advertised as available for any 234 * address. If the local rpcbind daemon is listening on AF_INET6, 235 * services registered via this function will be advertised on 236 * IN6ADDR_ANY (ie available for all AF_INET and AF_INET6 237 * addresses). 238 */ 239 int rpcb_register(u32 prog, u32 vers, int prot, unsigned short port) 240 { 241 struct rpcbind_args map = { 242 .r_prog = prog, 243 .r_vers = vers, 244 .r_prot = prot, 245 .r_port = port, 246 }; 247 struct rpc_message msg = { 248 .rpc_argp = &map, 249 }; 250 251 dprintk("RPC: %sregistering (%u, %u, %d, %u) with local " 252 "rpcbind\n", (port ? "" : "un"), 253 prog, vers, prot, port); 254 255 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_UNSET]; 256 if (port) 257 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_SET]; 258 259 return rpcb_register_call(RPCBVERS_2, &msg); 260 } 261 262 /* 263 * Fill in AF_INET family-specific arguments to register 264 */ 265 static int rpcb_register_inet4(const struct sockaddr *sap, 266 struct rpc_message *msg) 267 { 268 const struct sockaddr_in *sin = (const struct sockaddr_in *)sap; 269 struct rpcbind_args *map = msg->rpc_argp; 270 unsigned short port = ntohs(sin->sin_port); 271 char buf[32]; 272 273 /* Construct AF_INET universal address */ 274 snprintf(buf, sizeof(buf), "%pI4.%u.%u", 275 &sin->sin_addr.s_addr, port >> 8, port & 0xff); 276 map->r_addr = buf; 277 278 dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with " 279 "local rpcbind\n", (port ? "" : "un"), 280 map->r_prog, map->r_vers, 281 map->r_addr, map->r_netid); 282 283 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET]; 284 if (port) 285 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET]; 286 287 return rpcb_register_call(RPCBVERS_4, msg); 288 } 289 290 /* 291 * Fill in AF_INET6 family-specific arguments to register 292 */ 293 static int rpcb_register_inet6(const struct sockaddr *sap, 294 struct rpc_message *msg) 295 { 296 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sap; 297 struct rpcbind_args *map = msg->rpc_argp; 298 unsigned short port = ntohs(sin6->sin6_port); 299 char buf[64]; 300 301 /* Construct AF_INET6 universal address */ 302 if (ipv6_addr_any(&sin6->sin6_addr)) 303 snprintf(buf, sizeof(buf), "::.%u.%u", 304 port >> 8, port & 0xff); 305 else 306 snprintf(buf, sizeof(buf), "%pI6.%u.%u", 307 &sin6->sin6_addr, port >> 8, port & 0xff); 308 map->r_addr = buf; 309 310 dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with " 311 "local rpcbind\n", (port ? "" : "un"), 312 map->r_prog, map->r_vers, 313 map->r_addr, map->r_netid); 314 315 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET]; 316 if (port) 317 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET]; 318 319 return rpcb_register_call(RPCBVERS_4, msg); 320 } 321 322 static int rpcb_unregister_all_protofamilies(struct rpc_message *msg) 323 { 324 struct rpcbind_args *map = msg->rpc_argp; 325 326 dprintk("RPC: unregistering [%u, %u, '%s'] with " 327 "local rpcbind\n", 328 map->r_prog, map->r_vers, map->r_netid); 329 330 map->r_addr = ""; 331 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET]; 332 333 return rpcb_register_call(RPCBVERS_4, msg); 334 } 335 336 /** 337 * rpcb_v4_register - set or unset a port registration with the local rpcbind 338 * @program: RPC program number of service to (un)register 339 * @version: RPC version number of service to (un)register 340 * @address: address family, IP address, and port to (un)register 341 * @netid: netid of transport protocol to (un)register 342 * 343 * Returns zero if the registration request was dispatched successfully 344 * and the rpcbind daemon returned success. Otherwise, returns an errno 345 * value that reflects the nature of the error (request could not be 346 * dispatched, timed out, or rpcbind returned an error). 347 * 348 * RPC services invoke this function to advertise their contact 349 * information via the system's rpcbind daemon. RPC services 350 * invoke this function once for each [program, version, address, 351 * netid] tuple they wish to advertise. 352 * 353 * Callers may also unregister RPC services that are registered at a 354 * specific address by setting the port number in @address to zero. 355 * They may unregister all registered protocol families at once for 356 * a service by passing a NULL @address argument. If @netid is "" 357 * then all netids for [program, version, address] are unregistered. 358 * 359 * This function uses rpcbind protocol version 4 to contact the 360 * local rpcbind daemon. The local rpcbind daemon must support 361 * version 4 of the rpcbind protocol in order for these functions 362 * to register a service successfully. 363 * 364 * Supported netids include "udp" and "tcp" for UDP and TCP over 365 * IPv4, and "udp6" and "tcp6" for UDP and TCP over IPv6, 366 * respectively. 367 * 368 * The contents of @address determine the address family and the 369 * port to be registered. The usual practice is to pass INADDR_ANY 370 * as the raw address, but specifying a non-zero address is also 371 * supported by this API if the caller wishes to advertise an RPC 372 * service on a specific network interface. 373 * 374 * Note that passing in INADDR_ANY does not create the same service 375 * registration as IN6ADDR_ANY. The former advertises an RPC 376 * service on any IPv4 address, but not on IPv6. The latter 377 * advertises the service on all IPv4 and IPv6 addresses. 378 */ 379 int rpcb_v4_register(const u32 program, const u32 version, 380 const struct sockaddr *address, const char *netid) 381 { 382 struct rpcbind_args map = { 383 .r_prog = program, 384 .r_vers = version, 385 .r_netid = netid, 386 .r_owner = RPCB_OWNER_STRING, 387 }; 388 struct rpc_message msg = { 389 .rpc_argp = &map, 390 }; 391 392 if (address == NULL) 393 return rpcb_unregister_all_protofamilies(&msg); 394 395 switch (address->sa_family) { 396 case AF_INET: 397 return rpcb_register_inet4(address, &msg); 398 case AF_INET6: 399 return rpcb_register_inet6(address, &msg); 400 } 401 402 return -EAFNOSUPPORT; 403 } 404 405 /** 406 * rpcb_getport_sync - obtain the port for an RPC service on a given host 407 * @sin: address of remote peer 408 * @prog: RPC program number to bind 409 * @vers: RPC version number to bind 410 * @prot: transport protocol to use to make this request 411 * 412 * Return value is the requested advertised port number, 413 * or a negative errno value. 414 * 415 * Called from outside the RPC client in a synchronous task context. 416 * Uses default timeout parameters specified by underlying transport. 417 * 418 * XXX: Needs to support IPv6 419 */ 420 int rpcb_getport_sync(struct sockaddr_in *sin, u32 prog, u32 vers, int prot) 421 { 422 struct rpcbind_args map = { 423 .r_prog = prog, 424 .r_vers = vers, 425 .r_prot = prot, 426 .r_port = 0, 427 }; 428 struct rpc_message msg = { 429 .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT], 430 .rpc_argp = &map, 431 .rpc_resp = &map.r_port, 432 }; 433 struct rpc_clnt *rpcb_clnt; 434 int status; 435 436 dprintk("RPC: %s(%pI4, %u, %u, %d)\n", 437 __func__, &sin->sin_addr.s_addr, prog, vers, prot); 438 439 rpcb_clnt = rpcb_create(NULL, (struct sockaddr *)sin, 440 sizeof(*sin), prot, RPCBVERS_2); 441 if (IS_ERR(rpcb_clnt)) 442 return PTR_ERR(rpcb_clnt); 443 444 status = rpc_call_sync(rpcb_clnt, &msg, 0); 445 rpc_shutdown_client(rpcb_clnt); 446 447 if (status >= 0) { 448 if (map.r_port != 0) 449 return map.r_port; 450 status = -EACCES; 451 } 452 return status; 453 } 454 EXPORT_SYMBOL_GPL(rpcb_getport_sync); 455 456 static struct rpc_task *rpcb_call_async(struct rpc_clnt *rpcb_clnt, struct rpcbind_args *map, struct rpc_procinfo *proc) 457 { 458 struct rpc_message msg = { 459 .rpc_proc = proc, 460 .rpc_argp = map, 461 .rpc_resp = &map->r_port, 462 }; 463 struct rpc_task_setup task_setup_data = { 464 .rpc_client = rpcb_clnt, 465 .rpc_message = &msg, 466 .callback_ops = &rpcb_getport_ops, 467 .callback_data = map, 468 .flags = RPC_TASK_ASYNC, 469 }; 470 471 return rpc_run_task(&task_setup_data); 472 } 473 474 /* 475 * In the case where rpc clients have been cloned, we want to make 476 * sure that we use the program number/version etc of the actual 477 * owner of the xprt. To do so, we walk back up the tree of parents 478 * to find whoever created the transport and/or whoever has the 479 * autobind flag set. 480 */ 481 static struct rpc_clnt *rpcb_find_transport_owner(struct rpc_clnt *clnt) 482 { 483 struct rpc_clnt *parent = clnt->cl_parent; 484 485 while (parent != clnt) { 486 if (parent->cl_xprt != clnt->cl_xprt) 487 break; 488 if (clnt->cl_autobind) 489 break; 490 clnt = parent; 491 parent = parent->cl_parent; 492 } 493 return clnt; 494 } 495 496 /** 497 * rpcb_getport_async - obtain the port for a given RPC service on a given host 498 * @task: task that is waiting for portmapper request 499 * 500 * This one can be called for an ongoing RPC request, and can be used in 501 * an async (rpciod) context. 502 */ 503 void rpcb_getport_async(struct rpc_task *task) 504 { 505 struct rpc_clnt *clnt; 506 struct rpc_procinfo *proc; 507 u32 bind_version; 508 struct rpc_xprt *xprt; 509 struct rpc_clnt *rpcb_clnt; 510 static struct rpcbind_args *map; 511 struct rpc_task *child; 512 struct sockaddr_storage addr; 513 struct sockaddr *sap = (struct sockaddr *)&addr; 514 size_t salen; 515 int status; 516 517 clnt = rpcb_find_transport_owner(task->tk_client); 518 xprt = clnt->cl_xprt; 519 520 dprintk("RPC: %5u %s(%s, %u, %u, %d)\n", 521 task->tk_pid, __func__, 522 clnt->cl_server, clnt->cl_prog, clnt->cl_vers, xprt->prot); 523 524 /* Put self on the wait queue to ensure we get notified if 525 * some other task is already attempting to bind the port */ 526 rpc_sleep_on(&xprt->binding, task, NULL); 527 528 if (xprt_test_and_set_binding(xprt)) { 529 dprintk("RPC: %5u %s: waiting for another binder\n", 530 task->tk_pid, __func__); 531 return; 532 } 533 534 /* Someone else may have bound if we slept */ 535 if (xprt_bound(xprt)) { 536 status = 0; 537 dprintk("RPC: %5u %s: already bound\n", 538 task->tk_pid, __func__); 539 goto bailout_nofree; 540 } 541 542 salen = rpc_peeraddr(clnt, sap, sizeof(addr)); 543 544 /* Don't ever use rpcbind v2 for AF_INET6 requests */ 545 switch (sap->sa_family) { 546 case AF_INET: 547 proc = rpcb_next_version[xprt->bind_index].rpc_proc; 548 bind_version = rpcb_next_version[xprt->bind_index].rpc_vers; 549 break; 550 case AF_INET6: 551 proc = rpcb_next_version6[xprt->bind_index].rpc_proc; 552 bind_version = rpcb_next_version6[xprt->bind_index].rpc_vers; 553 break; 554 default: 555 status = -EAFNOSUPPORT; 556 dprintk("RPC: %5u %s: bad address family\n", 557 task->tk_pid, __func__); 558 goto bailout_nofree; 559 } 560 if (proc == NULL) { 561 xprt->bind_index = 0; 562 status = -EPFNOSUPPORT; 563 dprintk("RPC: %5u %s: no more getport versions available\n", 564 task->tk_pid, __func__); 565 goto bailout_nofree; 566 } 567 568 dprintk("RPC: %5u %s: trying rpcbind version %u\n", 569 task->tk_pid, __func__, bind_version); 570 571 rpcb_clnt = rpcb_create(clnt->cl_server, sap, salen, xprt->prot, 572 bind_version); 573 if (IS_ERR(rpcb_clnt)) { 574 status = PTR_ERR(rpcb_clnt); 575 dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n", 576 task->tk_pid, __func__, PTR_ERR(rpcb_clnt)); 577 goto bailout_nofree; 578 } 579 580 map = kzalloc(sizeof(struct rpcbind_args), GFP_ATOMIC); 581 if (!map) { 582 status = -ENOMEM; 583 dprintk("RPC: %5u %s: no memory available\n", 584 task->tk_pid, __func__); 585 goto bailout_release_client; 586 } 587 map->r_prog = clnt->cl_prog; 588 map->r_vers = clnt->cl_vers; 589 map->r_prot = xprt->prot; 590 map->r_port = 0; 591 map->r_xprt = xprt_get(xprt); 592 map->r_netid = rpc_peeraddr2str(clnt, RPC_DISPLAY_NETID); 593 map->r_addr = rpc_peeraddr2str(rpcb_clnt, RPC_DISPLAY_UNIVERSAL_ADDR); 594 map->r_owner = ""; 595 map->r_status = -EIO; 596 597 child = rpcb_call_async(rpcb_clnt, map, proc); 598 rpc_release_client(rpcb_clnt); 599 if (IS_ERR(child)) { 600 /* rpcb_map_release() has freed the arguments */ 601 dprintk("RPC: %5u %s: rpc_run_task failed\n", 602 task->tk_pid, __func__); 603 return; 604 } 605 606 xprt->stat.bind_count++; 607 rpc_put_task(child); 608 return; 609 610 bailout_release_client: 611 rpc_release_client(rpcb_clnt); 612 bailout_nofree: 613 rpcb_wake_rpcbind_waiters(xprt, status); 614 task->tk_status = status; 615 } 616 EXPORT_SYMBOL_GPL(rpcb_getport_async); 617 618 /* 619 * Rpcbind child task calls this callback via tk_exit. 620 */ 621 static void rpcb_getport_done(struct rpc_task *child, void *data) 622 { 623 struct rpcbind_args *map = data; 624 struct rpc_xprt *xprt = map->r_xprt; 625 int status = child->tk_status; 626 627 /* Garbage reply: retry with a lesser rpcbind version */ 628 if (status == -EIO) 629 status = -EPROTONOSUPPORT; 630 631 /* rpcbind server doesn't support this rpcbind protocol version */ 632 if (status == -EPROTONOSUPPORT) 633 xprt->bind_index++; 634 635 if (status < 0) { 636 /* rpcbind server not available on remote host? */ 637 xprt->ops->set_port(xprt, 0); 638 } else if (map->r_port == 0) { 639 /* Requested RPC service wasn't registered on remote host */ 640 xprt->ops->set_port(xprt, 0); 641 status = -EACCES; 642 } else { 643 /* Succeeded */ 644 xprt->ops->set_port(xprt, map->r_port); 645 xprt_set_bound(xprt); 646 status = 0; 647 } 648 649 dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n", 650 child->tk_pid, status, map->r_port); 651 652 map->r_status = status; 653 } 654 655 /* 656 * XDR functions for rpcbind 657 */ 658 659 static int rpcb_encode_mapping(struct rpc_rqst *req, __be32 *p, 660 struct rpcbind_args *rpcb) 661 { 662 dprintk("RPC: encoding rpcb request (%u, %u, %d, %u)\n", 663 rpcb->r_prog, rpcb->r_vers, rpcb->r_prot, rpcb->r_port); 664 *p++ = htonl(rpcb->r_prog); 665 *p++ = htonl(rpcb->r_vers); 666 *p++ = htonl(rpcb->r_prot); 667 *p++ = htonl(rpcb->r_port); 668 669 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); 670 return 0; 671 } 672 673 static int rpcb_decode_getport(struct rpc_rqst *req, __be32 *p, 674 unsigned short *portp) 675 { 676 *portp = (unsigned short) ntohl(*p++); 677 dprintk("RPC: rpcb getport result: %u\n", 678 *portp); 679 return 0; 680 } 681 682 static int rpcb_decode_set(struct rpc_rqst *req, __be32 *p, 683 unsigned int *boolp) 684 { 685 *boolp = (unsigned int) ntohl(*p++); 686 dprintk("RPC: rpcb set/unset call %s\n", 687 (*boolp ? "succeeded" : "failed")); 688 return 0; 689 } 690 691 static int rpcb_encode_getaddr(struct rpc_rqst *req, __be32 *p, 692 struct rpcbind_args *rpcb) 693 { 694 dprintk("RPC: encoding rpcb request (%u, %u, %s)\n", 695 rpcb->r_prog, rpcb->r_vers, rpcb->r_addr); 696 *p++ = htonl(rpcb->r_prog); 697 *p++ = htonl(rpcb->r_vers); 698 699 p = xdr_encode_string(p, rpcb->r_netid); 700 p = xdr_encode_string(p, rpcb->r_addr); 701 p = xdr_encode_string(p, rpcb->r_owner); 702 703 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); 704 705 return 0; 706 } 707 708 static int rpcb_decode_getaddr(struct rpc_rqst *req, __be32 *p, 709 unsigned short *portp) 710 { 711 char *addr; 712 u32 addr_len; 713 int c, i, f, first, val; 714 715 *portp = 0; 716 addr_len = ntohl(*p++); 717 718 if (addr_len == 0) { 719 dprintk("RPC: rpcb_decode_getaddr: " 720 "service is not registered\n"); 721 return 0; 722 } 723 724 /* 725 * Simple sanity check. 726 */ 727 if (addr_len > RPCBIND_MAXUADDRLEN) 728 goto out_err; 729 730 /* 731 * Start at the end and walk backwards until the first dot 732 * is encountered. When the second dot is found, we have 733 * both parts of the port number. 734 */ 735 addr = (char *)p; 736 val = 0; 737 first = 1; 738 f = 1; 739 for (i = addr_len - 1; i > 0; i--) { 740 c = addr[i]; 741 if (c >= '0' && c <= '9') { 742 val += (c - '0') * f; 743 f *= 10; 744 } else if (c == '.') { 745 if (first) { 746 *portp = val; 747 val = first = 0; 748 f = 1; 749 } else { 750 *portp |= (val << 8); 751 break; 752 } 753 } 754 } 755 756 /* 757 * Simple sanity check. If we never saw a dot in the reply, 758 * then this was probably just garbage. 759 */ 760 if (first) 761 goto out_err; 762 763 dprintk("RPC: rpcb_decode_getaddr port=%u\n", *portp); 764 return 0; 765 766 out_err: 767 dprintk("RPC: rpcbind server returned malformed reply\n"); 768 return -EIO; 769 } 770 771 #define RPCB_program_sz (1u) 772 #define RPCB_version_sz (1u) 773 #define RPCB_protocol_sz (1u) 774 #define RPCB_port_sz (1u) 775 #define RPCB_boolean_sz (1u) 776 777 #define RPCB_netid_sz (1+XDR_QUADLEN(RPCBIND_MAXNETIDLEN)) 778 #define RPCB_addr_sz (1+XDR_QUADLEN(RPCBIND_MAXUADDRLEN)) 779 #define RPCB_ownerstring_sz (1+XDR_QUADLEN(RPCB_MAXOWNERLEN)) 780 781 #define RPCB_mappingargs_sz RPCB_program_sz+RPCB_version_sz+ \ 782 RPCB_protocol_sz+RPCB_port_sz 783 #define RPCB_getaddrargs_sz RPCB_program_sz+RPCB_version_sz+ \ 784 RPCB_netid_sz+RPCB_addr_sz+ \ 785 RPCB_ownerstring_sz 786 787 #define RPCB_setres_sz RPCB_boolean_sz 788 #define RPCB_getportres_sz RPCB_port_sz 789 790 /* 791 * Note that RFC 1833 does not put any size restrictions on the 792 * address string returned by the remote rpcbind database. 793 */ 794 #define RPCB_getaddrres_sz RPCB_addr_sz 795 796 #define PROC(proc, argtype, restype) \ 797 [RPCBPROC_##proc] = { \ 798 .p_proc = RPCBPROC_##proc, \ 799 .p_encode = (kxdrproc_t) rpcb_encode_##argtype, \ 800 .p_decode = (kxdrproc_t) rpcb_decode_##restype, \ 801 .p_arglen = RPCB_##argtype##args_sz, \ 802 .p_replen = RPCB_##restype##res_sz, \ 803 .p_statidx = RPCBPROC_##proc, \ 804 .p_timer = 0, \ 805 .p_name = #proc, \ 806 } 807 808 /* 809 * Not all rpcbind procedures described in RFC 1833 are implemented 810 * since the Linux kernel RPC code requires only these. 811 */ 812 static struct rpc_procinfo rpcb_procedures2[] = { 813 PROC(SET, mapping, set), 814 PROC(UNSET, mapping, set), 815 PROC(GETPORT, mapping, getport), 816 }; 817 818 static struct rpc_procinfo rpcb_procedures3[] = { 819 PROC(SET, getaddr, set), 820 PROC(UNSET, getaddr, set), 821 PROC(GETADDR, getaddr, getaddr), 822 }; 823 824 static struct rpc_procinfo rpcb_procedures4[] = { 825 PROC(SET, getaddr, set), 826 PROC(UNSET, getaddr, set), 827 PROC(GETADDR, getaddr, getaddr), 828 PROC(GETVERSADDR, getaddr, getaddr), 829 }; 830 831 static struct rpcb_info rpcb_next_version[] = { 832 { 833 .rpc_vers = RPCBVERS_2, 834 .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT], 835 }, 836 { 837 .rpc_proc = NULL, 838 }, 839 }; 840 841 static struct rpcb_info rpcb_next_version6[] = { 842 { 843 .rpc_vers = RPCBVERS_4, 844 .rpc_proc = &rpcb_procedures4[RPCBPROC_GETADDR], 845 }, 846 { 847 .rpc_vers = RPCBVERS_3, 848 .rpc_proc = &rpcb_procedures3[RPCBPROC_GETADDR], 849 }, 850 { 851 .rpc_proc = NULL, 852 }, 853 }; 854 855 static struct rpc_version rpcb_version2 = { 856 .number = RPCBVERS_2, 857 .nrprocs = RPCB_HIGHPROC_2, 858 .procs = rpcb_procedures2 859 }; 860 861 static struct rpc_version rpcb_version3 = { 862 .number = RPCBVERS_3, 863 .nrprocs = RPCB_HIGHPROC_3, 864 .procs = rpcb_procedures3 865 }; 866 867 static struct rpc_version rpcb_version4 = { 868 .number = RPCBVERS_4, 869 .nrprocs = RPCB_HIGHPROC_4, 870 .procs = rpcb_procedures4 871 }; 872 873 static struct rpc_version *rpcb_version[] = { 874 NULL, 875 NULL, 876 &rpcb_version2, 877 &rpcb_version3, 878 &rpcb_version4 879 }; 880 881 static struct rpc_stat rpcb_stats; 882 883 static struct rpc_program rpcb_program = { 884 .name = "rpcbind", 885 .number = RPCBIND_PROGRAM, 886 .nrvers = ARRAY_SIZE(rpcb_version), 887 .version = rpcb_version, 888 .stats = &rpcb_stats, 889 }; 890