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 * We always use the following (arbitrary) fixed string. 67 */ 68 #define RPCB_OWNER_STRING "rpcb" 69 #define RPCB_MAXOWNERLEN sizeof(RPCB_OWNER_STRING) 70 71 static void rpcb_getport_done(struct rpc_task *, void *); 72 static void rpcb_map_release(void *data); 73 static struct rpc_program rpcb_program; 74 75 struct rpcbind_args { 76 struct rpc_xprt * r_xprt; 77 78 u32 r_prog; 79 u32 r_vers; 80 u32 r_prot; 81 unsigned short r_port; 82 const char * r_netid; 83 const char * r_addr; 84 const char * r_owner; 85 86 int r_status; 87 }; 88 89 static struct rpc_procinfo rpcb_procedures2[]; 90 static struct rpc_procinfo rpcb_procedures3[]; 91 static struct rpc_procinfo rpcb_procedures4[]; 92 93 struct rpcb_info { 94 u32 rpc_vers; 95 struct rpc_procinfo * rpc_proc; 96 }; 97 98 static struct rpcb_info rpcb_next_version[]; 99 static struct rpcb_info rpcb_next_version6[]; 100 101 static const struct rpc_call_ops rpcb_getport_ops = { 102 .rpc_call_done = rpcb_getport_done, 103 .rpc_release = rpcb_map_release, 104 }; 105 106 static void rpcb_wake_rpcbind_waiters(struct rpc_xprt *xprt, int status) 107 { 108 xprt_clear_binding(xprt); 109 rpc_wake_up_status(&xprt->binding, status); 110 } 111 112 static void rpcb_map_release(void *data) 113 { 114 struct rpcbind_args *map = data; 115 116 rpcb_wake_rpcbind_waiters(map->r_xprt, map->r_status); 117 xprt_put(map->r_xprt); 118 kfree(map); 119 } 120 121 static const struct sockaddr_in rpcb_inaddr_loopback = { 122 .sin_family = AF_INET, 123 .sin_addr.s_addr = htonl(INADDR_LOOPBACK), 124 .sin_port = htons(RPCBIND_PORT), 125 }; 126 127 static const struct sockaddr_in6 rpcb_in6addr_loopback = { 128 .sin6_family = AF_INET6, 129 .sin6_addr = IN6ADDR_LOOPBACK_INIT, 130 .sin6_port = htons(RPCBIND_PORT), 131 }; 132 133 static struct rpc_clnt *rpcb_create_local(struct sockaddr *addr, 134 size_t addrlen, u32 version) 135 { 136 struct rpc_create_args args = { 137 .protocol = XPRT_TRANSPORT_UDP, 138 .address = addr, 139 .addrsize = addrlen, 140 .servername = "localhost", 141 .program = &rpcb_program, 142 .version = version, 143 .authflavor = RPC_AUTH_UNIX, 144 .flags = RPC_CLNT_CREATE_NOPING, 145 }; 146 147 return rpc_create(&args); 148 } 149 150 static struct rpc_clnt *rpcb_create(char *hostname, struct sockaddr *srvaddr, 151 size_t salen, int proto, u32 version) 152 { 153 struct rpc_create_args args = { 154 .protocol = proto, 155 .address = srvaddr, 156 .addrsize = salen, 157 .servername = hostname, 158 .program = &rpcb_program, 159 .version = version, 160 .authflavor = RPC_AUTH_UNIX, 161 .flags = (RPC_CLNT_CREATE_NOPING | 162 RPC_CLNT_CREATE_NONPRIVPORT), 163 }; 164 165 switch (srvaddr->sa_family) { 166 case AF_INET: 167 ((struct sockaddr_in *)srvaddr)->sin_port = htons(RPCBIND_PORT); 168 break; 169 case AF_INET6: 170 ((struct sockaddr_in6 *)srvaddr)->sin6_port = htons(RPCBIND_PORT); 171 break; 172 default: 173 return NULL; 174 } 175 176 return rpc_create(&args); 177 } 178 179 static int rpcb_register_call(struct sockaddr *addr, size_t addrlen, 180 u32 version, struct rpc_message *msg) 181 { 182 struct rpc_clnt *rpcb_clnt; 183 int result, error = 0; 184 185 msg->rpc_resp = &result; 186 187 rpcb_clnt = rpcb_create_local(addr, addrlen, version); 188 if (!IS_ERR(rpcb_clnt)) { 189 error = rpc_call_sync(rpcb_clnt, msg, 0); 190 rpc_shutdown_client(rpcb_clnt); 191 } else 192 error = PTR_ERR(rpcb_clnt); 193 194 if (error < 0) { 195 printk(KERN_WARNING "RPC: failed to contact local rpcbind " 196 "server (errno %d).\n", -error); 197 return error; 198 } 199 200 if (!result) 201 return -EACCES; 202 return 0; 203 } 204 205 /** 206 * rpcb_register - set or unset a port registration with the local rpcbind svc 207 * @prog: RPC program number to bind 208 * @vers: RPC version number to bind 209 * @prot: transport protocol to register 210 * @port: port value to register 211 * 212 * Returns zero if the registration request was dispatched successfully 213 * and the rpcbind daemon returned success. Otherwise, returns an errno 214 * value that reflects the nature of the error (request could not be 215 * dispatched, timed out, or rpcbind returned an error). 216 * 217 * RPC services invoke this function to advertise their contact 218 * information via the system's rpcbind daemon. RPC services 219 * invoke this function once for each [program, version, transport] 220 * tuple they wish to advertise. 221 * 222 * Callers may also unregister RPC services that are no longer 223 * available by setting the passed-in port to zero. This removes 224 * all registered transports for [program, version] from the local 225 * rpcbind database. 226 * 227 * This function uses rpcbind protocol version 2 to contact the 228 * local rpcbind daemon. 229 * 230 * Registration works over both AF_INET and AF_INET6, and services 231 * registered via this function are advertised as available for any 232 * address. If the local rpcbind daemon is listening on AF_INET6, 233 * services registered via this function will be advertised on 234 * IN6ADDR_ANY (ie available for all AF_INET and AF_INET6 235 * addresses). 236 */ 237 int rpcb_register(u32 prog, u32 vers, int prot, unsigned short port) 238 { 239 struct rpcbind_args map = { 240 .r_prog = prog, 241 .r_vers = vers, 242 .r_prot = prot, 243 .r_port = port, 244 }; 245 struct rpc_message msg = { 246 .rpc_argp = &map, 247 }; 248 249 dprintk("RPC: %sregistering (%u, %u, %d, %u) with local " 250 "rpcbind\n", (port ? "" : "un"), 251 prog, vers, prot, port); 252 253 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_UNSET]; 254 if (port) 255 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_SET]; 256 257 return rpcb_register_call((struct sockaddr *)&rpcb_inaddr_loopback, 258 sizeof(rpcb_inaddr_loopback), 259 RPCBVERS_2, &msg); 260 } 261 262 /* 263 * Fill in AF_INET family-specific arguments to register 264 */ 265 static int rpcb_register_netid4(struct sockaddr_in *address_to_register, 266 struct rpc_message *msg) 267 { 268 struct rpcbind_args *map = msg->rpc_argp; 269 unsigned short port = ntohs(address_to_register->sin_port); 270 char buf[32]; 271 272 /* Construct AF_INET universal address */ 273 snprintf(buf, sizeof(buf), "%pI4.%u.%u", 274 &address_to_register->sin_addr.s_addr, 275 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((struct sockaddr *)&rpcb_inaddr_loopback, 288 sizeof(rpcb_inaddr_loopback), 289 RPCBVERS_4, msg); 290 } 291 292 /* 293 * Fill in AF_INET6 family-specific arguments to register 294 */ 295 static int rpcb_register_netid6(struct sockaddr_in6 *address_to_register, 296 struct rpc_message *msg) 297 { 298 struct rpcbind_args *map = msg->rpc_argp; 299 unsigned short port = ntohs(address_to_register->sin6_port); 300 char buf[64]; 301 302 /* Construct AF_INET6 universal address */ 303 if (ipv6_addr_any(&address_to_register->sin6_addr)) 304 snprintf(buf, sizeof(buf), "::.%u.%u", 305 port >> 8, port & 0xff); 306 else 307 snprintf(buf, sizeof(buf), "%pI6.%u.%u", 308 &address_to_register->sin6_addr, 309 port >> 8, port & 0xff); 310 map->r_addr = buf; 311 312 dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with " 313 "local rpcbind\n", (port ? "" : "un"), 314 map->r_prog, map->r_vers, 315 map->r_addr, map->r_netid); 316 317 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET]; 318 if (port) 319 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET]; 320 321 return rpcb_register_call((struct sockaddr *)&rpcb_in6addr_loopback, 322 sizeof(rpcb_in6addr_loopback), 323 RPCBVERS_4, msg); 324 } 325 326 /** 327 * rpcb_v4_register - set or unset a port registration with the local rpcbind 328 * @program: RPC program number of service to (un)register 329 * @version: RPC version number of service to (un)register 330 * @address: address family, IP address, and port to (un)register 331 * @netid: netid of transport protocol to (un)register 332 * 333 * Returns zero if the registration request was dispatched successfully 334 * and the rpcbind daemon returned success. Otherwise, returns an errno 335 * value that reflects the nature of the error (request could not be 336 * dispatched, timed out, or rpcbind returned an error). 337 * 338 * RPC services invoke this function to advertise their contact 339 * information via the system's rpcbind daemon. RPC services 340 * invoke this function once for each [program, version, address, 341 * netid] tuple they wish to advertise. 342 * 343 * Callers may also unregister RPC services that are no longer 344 * available by setting the port number in the passed-in address 345 * to zero. Callers pass a netid of "" to unregister all 346 * transport netids associated with [program, version, address]. 347 * 348 * This function uses rpcbind protocol version 4 to contact the 349 * local rpcbind daemon. The local rpcbind daemon must support 350 * version 4 of the rpcbind protocol in order for these functions 351 * to register a service successfully. 352 * 353 * Supported netids include "udp" and "tcp" for UDP and TCP over 354 * IPv4, and "udp6" and "tcp6" for UDP and TCP over IPv6, 355 * respectively. 356 * 357 * The contents of @address determine the address family and the 358 * port to be registered. The usual practice is to pass INADDR_ANY 359 * as the raw address, but specifying a non-zero address is also 360 * supported by this API if the caller wishes to advertise an RPC 361 * service on a specific network interface. 362 * 363 * Note that passing in INADDR_ANY does not create the same service 364 * registration as IN6ADDR_ANY. The former advertises an RPC 365 * service on any IPv4 address, but not on IPv6. The latter 366 * advertises the service on all IPv4 and IPv6 addresses. 367 */ 368 int rpcb_v4_register(const u32 program, const u32 version, 369 const struct sockaddr *address, const char *netid) 370 { 371 struct rpcbind_args map = { 372 .r_prog = program, 373 .r_vers = version, 374 .r_netid = netid, 375 .r_owner = RPCB_OWNER_STRING, 376 }; 377 struct rpc_message msg = { 378 .rpc_argp = &map, 379 }; 380 381 switch (address->sa_family) { 382 case AF_INET: 383 return rpcb_register_netid4((struct sockaddr_in *)address, 384 &msg); 385 case AF_INET6: 386 return rpcb_register_netid6((struct sockaddr_in6 *)address, 387 &msg); 388 } 389 390 return -EAFNOSUPPORT; 391 } 392 393 /** 394 * rpcb_getport_sync - obtain the port for an RPC service on a given host 395 * @sin: address of remote peer 396 * @prog: RPC program number to bind 397 * @vers: RPC version number to bind 398 * @prot: transport protocol to use to make this request 399 * 400 * Return value is the requested advertised port number, 401 * or a negative errno value. 402 * 403 * Called from outside the RPC client in a synchronous task context. 404 * Uses default timeout parameters specified by underlying transport. 405 * 406 * XXX: Needs to support IPv6 407 */ 408 int rpcb_getport_sync(struct sockaddr_in *sin, u32 prog, u32 vers, int prot) 409 { 410 struct rpcbind_args map = { 411 .r_prog = prog, 412 .r_vers = vers, 413 .r_prot = prot, 414 .r_port = 0, 415 }; 416 struct rpc_message msg = { 417 .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT], 418 .rpc_argp = &map, 419 .rpc_resp = &map.r_port, 420 }; 421 struct rpc_clnt *rpcb_clnt; 422 int status; 423 424 dprintk("RPC: %s(%pI4, %u, %u, %d)\n", 425 __func__, &sin->sin_addr.s_addr, prog, vers, prot); 426 427 rpcb_clnt = rpcb_create(NULL, (struct sockaddr *)sin, 428 sizeof(*sin), prot, RPCBVERS_2); 429 if (IS_ERR(rpcb_clnt)) 430 return PTR_ERR(rpcb_clnt); 431 432 status = rpc_call_sync(rpcb_clnt, &msg, 0); 433 rpc_shutdown_client(rpcb_clnt); 434 435 if (status >= 0) { 436 if (map.r_port != 0) 437 return map.r_port; 438 status = -EACCES; 439 } 440 return status; 441 } 442 EXPORT_SYMBOL_GPL(rpcb_getport_sync); 443 444 static struct rpc_task *rpcb_call_async(struct rpc_clnt *rpcb_clnt, struct rpcbind_args *map, struct rpc_procinfo *proc) 445 { 446 struct rpc_message msg = { 447 .rpc_proc = proc, 448 .rpc_argp = map, 449 .rpc_resp = &map->r_port, 450 }; 451 struct rpc_task_setup task_setup_data = { 452 .rpc_client = rpcb_clnt, 453 .rpc_message = &msg, 454 .callback_ops = &rpcb_getport_ops, 455 .callback_data = map, 456 .flags = RPC_TASK_ASYNC, 457 }; 458 459 return rpc_run_task(&task_setup_data); 460 } 461 462 /* 463 * In the case where rpc clients have been cloned, we want to make 464 * sure that we use the program number/version etc of the actual 465 * owner of the xprt. To do so, we walk back up the tree of parents 466 * to find whoever created the transport and/or whoever has the 467 * autobind flag set. 468 */ 469 static struct rpc_clnt *rpcb_find_transport_owner(struct rpc_clnt *clnt) 470 { 471 struct rpc_clnt *parent = clnt->cl_parent; 472 473 while (parent != clnt) { 474 if (parent->cl_xprt != clnt->cl_xprt) 475 break; 476 if (clnt->cl_autobind) 477 break; 478 clnt = parent; 479 parent = parent->cl_parent; 480 } 481 return clnt; 482 } 483 484 /** 485 * rpcb_getport_async - obtain the port for a given RPC service on a given host 486 * @task: task that is waiting for portmapper request 487 * 488 * This one can be called for an ongoing RPC request, and can be used in 489 * an async (rpciod) context. 490 */ 491 void rpcb_getport_async(struct rpc_task *task) 492 { 493 struct rpc_clnt *clnt; 494 struct rpc_procinfo *proc; 495 u32 bind_version; 496 struct rpc_xprt *xprt; 497 struct rpc_clnt *rpcb_clnt; 498 static struct rpcbind_args *map; 499 struct rpc_task *child; 500 struct sockaddr_storage addr; 501 struct sockaddr *sap = (struct sockaddr *)&addr; 502 size_t salen; 503 int status; 504 505 clnt = rpcb_find_transport_owner(task->tk_client); 506 xprt = clnt->cl_xprt; 507 508 dprintk("RPC: %5u %s(%s, %u, %u, %d)\n", 509 task->tk_pid, __func__, 510 clnt->cl_server, clnt->cl_prog, clnt->cl_vers, xprt->prot); 511 512 /* Put self on the wait queue to ensure we get notified if 513 * some other task is already attempting to bind the port */ 514 rpc_sleep_on(&xprt->binding, task, NULL); 515 516 if (xprt_test_and_set_binding(xprt)) { 517 dprintk("RPC: %5u %s: waiting for another binder\n", 518 task->tk_pid, __func__); 519 return; 520 } 521 522 /* Someone else may have bound if we slept */ 523 if (xprt_bound(xprt)) { 524 status = 0; 525 dprintk("RPC: %5u %s: already bound\n", 526 task->tk_pid, __func__); 527 goto bailout_nofree; 528 } 529 530 salen = rpc_peeraddr(clnt, sap, sizeof(addr)); 531 532 /* Don't ever use rpcbind v2 for AF_INET6 requests */ 533 switch (sap->sa_family) { 534 case AF_INET: 535 proc = rpcb_next_version[xprt->bind_index].rpc_proc; 536 bind_version = rpcb_next_version[xprt->bind_index].rpc_vers; 537 break; 538 case AF_INET6: 539 proc = rpcb_next_version6[xprt->bind_index].rpc_proc; 540 bind_version = rpcb_next_version6[xprt->bind_index].rpc_vers; 541 break; 542 default: 543 status = -EAFNOSUPPORT; 544 dprintk("RPC: %5u %s: bad address family\n", 545 task->tk_pid, __func__); 546 goto bailout_nofree; 547 } 548 if (proc == NULL) { 549 xprt->bind_index = 0; 550 status = -EPFNOSUPPORT; 551 dprintk("RPC: %5u %s: no more getport versions available\n", 552 task->tk_pid, __func__); 553 goto bailout_nofree; 554 } 555 556 dprintk("RPC: %5u %s: trying rpcbind version %u\n", 557 task->tk_pid, __func__, bind_version); 558 559 rpcb_clnt = rpcb_create(clnt->cl_server, sap, salen, xprt->prot, 560 bind_version); 561 if (IS_ERR(rpcb_clnt)) { 562 status = PTR_ERR(rpcb_clnt); 563 dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n", 564 task->tk_pid, __func__, PTR_ERR(rpcb_clnt)); 565 goto bailout_nofree; 566 } 567 568 map = kzalloc(sizeof(struct rpcbind_args), GFP_ATOMIC); 569 if (!map) { 570 status = -ENOMEM; 571 dprintk("RPC: %5u %s: no memory available\n", 572 task->tk_pid, __func__); 573 goto bailout_release_client; 574 } 575 map->r_prog = clnt->cl_prog; 576 map->r_vers = clnt->cl_vers; 577 map->r_prot = xprt->prot; 578 map->r_port = 0; 579 map->r_xprt = xprt_get(xprt); 580 map->r_netid = rpc_peeraddr2str(clnt, RPC_DISPLAY_NETID); 581 map->r_addr = rpc_peeraddr2str(rpcb_clnt, RPC_DISPLAY_UNIVERSAL_ADDR); 582 map->r_owner = RPCB_OWNER_STRING; /* ignored for GETADDR */ 583 map->r_status = -EIO; 584 585 child = rpcb_call_async(rpcb_clnt, map, proc); 586 rpc_release_client(rpcb_clnt); 587 if (IS_ERR(child)) { 588 /* rpcb_map_release() has freed the arguments */ 589 dprintk("RPC: %5u %s: rpc_run_task failed\n", 590 task->tk_pid, __func__); 591 return; 592 } 593 594 xprt->stat.bind_count++; 595 rpc_put_task(child); 596 return; 597 598 bailout_release_client: 599 rpc_release_client(rpcb_clnt); 600 bailout_nofree: 601 rpcb_wake_rpcbind_waiters(xprt, status); 602 task->tk_status = status; 603 } 604 EXPORT_SYMBOL_GPL(rpcb_getport_async); 605 606 /* 607 * Rpcbind child task calls this callback via tk_exit. 608 */ 609 static void rpcb_getport_done(struct rpc_task *child, void *data) 610 { 611 struct rpcbind_args *map = data; 612 struct rpc_xprt *xprt = map->r_xprt; 613 int status = child->tk_status; 614 615 /* Garbage reply: retry with a lesser rpcbind version */ 616 if (status == -EIO) 617 status = -EPROTONOSUPPORT; 618 619 /* rpcbind server doesn't support this rpcbind protocol version */ 620 if (status == -EPROTONOSUPPORT) 621 xprt->bind_index++; 622 623 if (status < 0) { 624 /* rpcbind server not available on remote host? */ 625 xprt->ops->set_port(xprt, 0); 626 } else if (map->r_port == 0) { 627 /* Requested RPC service wasn't registered on remote host */ 628 xprt->ops->set_port(xprt, 0); 629 status = -EACCES; 630 } else { 631 /* Succeeded */ 632 xprt->ops->set_port(xprt, map->r_port); 633 xprt_set_bound(xprt); 634 status = 0; 635 } 636 637 dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n", 638 child->tk_pid, status, map->r_port); 639 640 map->r_status = status; 641 } 642 643 /* 644 * XDR functions for rpcbind 645 */ 646 647 static int rpcb_encode_mapping(struct rpc_rqst *req, __be32 *p, 648 struct rpcbind_args *rpcb) 649 { 650 dprintk("RPC: encoding rpcb request (%u, %u, %d, %u)\n", 651 rpcb->r_prog, rpcb->r_vers, rpcb->r_prot, rpcb->r_port); 652 *p++ = htonl(rpcb->r_prog); 653 *p++ = htonl(rpcb->r_vers); 654 *p++ = htonl(rpcb->r_prot); 655 *p++ = htonl(rpcb->r_port); 656 657 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); 658 return 0; 659 } 660 661 static int rpcb_decode_getport(struct rpc_rqst *req, __be32 *p, 662 unsigned short *portp) 663 { 664 *portp = (unsigned short) ntohl(*p++); 665 dprintk("RPC: rpcb getport result: %u\n", 666 *portp); 667 return 0; 668 } 669 670 static int rpcb_decode_set(struct rpc_rqst *req, __be32 *p, 671 unsigned int *boolp) 672 { 673 *boolp = (unsigned int) ntohl(*p++); 674 dprintk("RPC: rpcb set/unset call %s\n", 675 (*boolp ? "succeeded" : "failed")); 676 return 0; 677 } 678 679 static int rpcb_encode_getaddr(struct rpc_rqst *req, __be32 *p, 680 struct rpcbind_args *rpcb) 681 { 682 dprintk("RPC: encoding rpcb request (%u, %u, %s)\n", 683 rpcb->r_prog, rpcb->r_vers, rpcb->r_addr); 684 *p++ = htonl(rpcb->r_prog); 685 *p++ = htonl(rpcb->r_vers); 686 687 p = xdr_encode_string(p, rpcb->r_netid); 688 p = xdr_encode_string(p, rpcb->r_addr); 689 p = xdr_encode_string(p, rpcb->r_owner); 690 691 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); 692 693 return 0; 694 } 695 696 static int rpcb_decode_getaddr(struct rpc_rqst *req, __be32 *p, 697 unsigned short *portp) 698 { 699 char *addr; 700 u32 addr_len; 701 int c, i, f, first, val; 702 703 *portp = 0; 704 addr_len = ntohl(*p++); 705 706 /* 707 * Simple sanity check. The smallest possible universal 708 * address is an IPv4 address string containing 11 bytes. 709 */ 710 if (addr_len < 11 || addr_len > RPCBIND_MAXUADDRLEN) 711 goto out_err; 712 713 /* 714 * Start at the end and walk backwards until the first dot 715 * is encountered. When the second dot is found, we have 716 * both parts of the port number. 717 */ 718 addr = (char *)p; 719 val = 0; 720 first = 1; 721 f = 1; 722 for (i = addr_len - 1; i > 0; i--) { 723 c = addr[i]; 724 if (c >= '0' && c <= '9') { 725 val += (c - '0') * f; 726 f *= 10; 727 } else if (c == '.') { 728 if (first) { 729 *portp = val; 730 val = first = 0; 731 f = 1; 732 } else { 733 *portp |= (val << 8); 734 break; 735 } 736 } 737 } 738 739 /* 740 * Simple sanity check. If we never saw a dot in the reply, 741 * then this was probably just garbage. 742 */ 743 if (first) 744 goto out_err; 745 746 dprintk("RPC: rpcb_decode_getaddr port=%u\n", *portp); 747 return 0; 748 749 out_err: 750 dprintk("RPC: rpcbind server returned malformed reply\n"); 751 return -EIO; 752 } 753 754 #define RPCB_program_sz (1u) 755 #define RPCB_version_sz (1u) 756 #define RPCB_protocol_sz (1u) 757 #define RPCB_port_sz (1u) 758 #define RPCB_boolean_sz (1u) 759 760 #define RPCB_netid_sz (1+XDR_QUADLEN(RPCBIND_MAXNETIDLEN)) 761 #define RPCB_addr_sz (1+XDR_QUADLEN(RPCBIND_MAXUADDRLEN)) 762 #define RPCB_ownerstring_sz (1+XDR_QUADLEN(RPCB_MAXOWNERLEN)) 763 764 #define RPCB_mappingargs_sz RPCB_program_sz+RPCB_version_sz+ \ 765 RPCB_protocol_sz+RPCB_port_sz 766 #define RPCB_getaddrargs_sz RPCB_program_sz+RPCB_version_sz+ \ 767 RPCB_netid_sz+RPCB_addr_sz+ \ 768 RPCB_ownerstring_sz 769 770 #define RPCB_setres_sz RPCB_boolean_sz 771 #define RPCB_getportres_sz RPCB_port_sz 772 773 /* 774 * Note that RFC 1833 does not put any size restrictions on the 775 * address string returned by the remote rpcbind database. 776 */ 777 #define RPCB_getaddrres_sz RPCB_addr_sz 778 779 #define PROC(proc, argtype, restype) \ 780 [RPCBPROC_##proc] = { \ 781 .p_proc = RPCBPROC_##proc, \ 782 .p_encode = (kxdrproc_t) rpcb_encode_##argtype, \ 783 .p_decode = (kxdrproc_t) rpcb_decode_##restype, \ 784 .p_arglen = RPCB_##argtype##args_sz, \ 785 .p_replen = RPCB_##restype##res_sz, \ 786 .p_statidx = RPCBPROC_##proc, \ 787 .p_timer = 0, \ 788 .p_name = #proc, \ 789 } 790 791 /* 792 * Not all rpcbind procedures described in RFC 1833 are implemented 793 * since the Linux kernel RPC code requires only these. 794 */ 795 static struct rpc_procinfo rpcb_procedures2[] = { 796 PROC(SET, mapping, set), 797 PROC(UNSET, mapping, set), 798 PROC(GETPORT, mapping, getport), 799 }; 800 801 static struct rpc_procinfo rpcb_procedures3[] = { 802 PROC(SET, getaddr, set), 803 PROC(UNSET, getaddr, set), 804 PROC(GETADDR, getaddr, getaddr), 805 }; 806 807 static struct rpc_procinfo rpcb_procedures4[] = { 808 PROC(SET, getaddr, set), 809 PROC(UNSET, getaddr, set), 810 PROC(GETADDR, getaddr, getaddr), 811 PROC(GETVERSADDR, getaddr, getaddr), 812 }; 813 814 static struct rpcb_info rpcb_next_version[] = { 815 { 816 .rpc_vers = RPCBVERS_2, 817 .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT], 818 }, 819 { 820 .rpc_proc = NULL, 821 }, 822 }; 823 824 static struct rpcb_info rpcb_next_version6[] = { 825 { 826 .rpc_vers = RPCBVERS_4, 827 .rpc_proc = &rpcb_procedures4[RPCBPROC_GETADDR], 828 }, 829 { 830 .rpc_vers = RPCBVERS_3, 831 .rpc_proc = &rpcb_procedures3[RPCBPROC_GETADDR], 832 }, 833 { 834 .rpc_proc = NULL, 835 }, 836 }; 837 838 static struct rpc_version rpcb_version2 = { 839 .number = RPCBVERS_2, 840 .nrprocs = RPCB_HIGHPROC_2, 841 .procs = rpcb_procedures2 842 }; 843 844 static struct rpc_version rpcb_version3 = { 845 .number = RPCBVERS_3, 846 .nrprocs = RPCB_HIGHPROC_3, 847 .procs = rpcb_procedures3 848 }; 849 850 static struct rpc_version rpcb_version4 = { 851 .number = RPCBVERS_4, 852 .nrprocs = RPCB_HIGHPROC_4, 853 .procs = rpcb_procedures4 854 }; 855 856 static struct rpc_version *rpcb_version[] = { 857 NULL, 858 NULL, 859 &rpcb_version2, 860 &rpcb_version3, 861 &rpcb_version4 862 }; 863 864 static struct rpc_stat rpcb_stats; 865 866 static struct rpc_program rpcb_program = { 867 .name = "rpcbind", 868 .number = RPCBIND_PROGRAM, 869 .nrvers = ARRAY_SIZE(rpcb_version), 870 .version = rpcb_version, 871 .stats = &rpcb_stats, 872 }; 873