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), 274 NIPQUAD_FMT".%u.%u", 275 NIPQUAD(address_to_register->sin_addr.s_addr), 276 port >> 8, port & 0xff); 277 map->r_addr = buf; 278 279 dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with " 280 "local rpcbind\n", (port ? "" : "un"), 281 map->r_prog, map->r_vers, 282 map->r_addr, map->r_netid); 283 284 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET]; 285 if (port) 286 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET]; 287 288 return rpcb_register_call((struct sockaddr *)&rpcb_inaddr_loopback, 289 sizeof(rpcb_inaddr_loopback), 290 RPCBVERS_4, msg); 291 } 292 293 /* 294 * Fill in AF_INET6 family-specific arguments to register 295 */ 296 static int rpcb_register_netid6(struct sockaddr_in6 *address_to_register, 297 struct rpc_message *msg) 298 { 299 struct rpcbind_args *map = msg->rpc_argp; 300 unsigned short port = ntohs(address_to_register->sin6_port); 301 char buf[64]; 302 303 /* Construct AF_INET6 universal address */ 304 if (ipv6_addr_any(&address_to_register->sin6_addr)) 305 snprintf(buf, sizeof(buf), "::.%u.%u", 306 port >> 8, port & 0xff); 307 else 308 snprintf(buf, sizeof(buf), NIP6_FMT".%u.%u", 309 NIP6(address_to_register->sin6_addr), 310 port >> 8, port & 0xff); 311 map->r_addr = buf; 312 313 dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with " 314 "local rpcbind\n", (port ? "" : "un"), 315 map->r_prog, map->r_vers, 316 map->r_addr, map->r_netid); 317 318 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET]; 319 if (port) 320 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET]; 321 322 return rpcb_register_call((struct sockaddr *)&rpcb_in6addr_loopback, 323 sizeof(rpcb_in6addr_loopback), 324 RPCBVERS_4, msg); 325 } 326 327 /** 328 * rpcb_v4_register - set or unset a port registration with the local rpcbind 329 * @program: RPC program number of service to (un)register 330 * @version: RPC version number of service to (un)register 331 * @address: address family, IP address, and port to (un)register 332 * @netid: netid of transport protocol to (un)register 333 * 334 * Returns zero if the registration request was dispatched successfully 335 * and the rpcbind daemon returned success. Otherwise, returns an errno 336 * value that reflects the nature of the error (request could not be 337 * dispatched, timed out, or rpcbind returned an error). 338 * 339 * RPC services invoke this function to advertise their contact 340 * information via the system's rpcbind daemon. RPC services 341 * invoke this function once for each [program, version, address, 342 * netid] tuple they wish to advertise. 343 * 344 * Callers may also unregister RPC services that are no longer 345 * available by setting the port number in the passed-in address 346 * to zero. Callers pass a netid of "" to unregister all 347 * transport netids associated with [program, version, address]. 348 * 349 * This function uses rpcbind protocol version 4 to contact the 350 * local rpcbind daemon. The local rpcbind daemon must support 351 * version 4 of the rpcbind protocol in order for these functions 352 * to register a service successfully. 353 * 354 * Supported netids include "udp" and "tcp" for UDP and TCP over 355 * IPv4, and "udp6" and "tcp6" for UDP and TCP over IPv6, 356 * respectively. 357 * 358 * The contents of @address determine the address family and the 359 * port to be registered. The usual practice is to pass INADDR_ANY 360 * as the raw address, but specifying a non-zero address is also 361 * supported by this API if the caller wishes to advertise an RPC 362 * service on a specific network interface. 363 * 364 * Note that passing in INADDR_ANY does not create the same service 365 * registration as IN6ADDR_ANY. The former advertises an RPC 366 * service on any IPv4 address, but not on IPv6. The latter 367 * advertises the service on all IPv4 and IPv6 addresses. 368 */ 369 int rpcb_v4_register(const u32 program, const u32 version, 370 const struct sockaddr *address, const char *netid) 371 { 372 struct rpcbind_args map = { 373 .r_prog = program, 374 .r_vers = version, 375 .r_netid = netid, 376 .r_owner = RPCB_OWNER_STRING, 377 }; 378 struct rpc_message msg = { 379 .rpc_argp = &map, 380 }; 381 382 switch (address->sa_family) { 383 case AF_INET: 384 return rpcb_register_netid4((struct sockaddr_in *)address, 385 &msg); 386 case AF_INET6: 387 return rpcb_register_netid6((struct sockaddr_in6 *)address, 388 &msg); 389 } 390 391 return -EAFNOSUPPORT; 392 } 393 394 /** 395 * rpcb_getport_sync - obtain the port for an RPC service on a given host 396 * @sin: address of remote peer 397 * @prog: RPC program number to bind 398 * @vers: RPC version number to bind 399 * @prot: transport protocol to use to make this request 400 * 401 * Return value is the requested advertised port number, 402 * or a negative errno value. 403 * 404 * Called from outside the RPC client in a synchronous task context. 405 * Uses default timeout parameters specified by underlying transport. 406 * 407 * XXX: Needs to support IPv6 408 */ 409 int rpcb_getport_sync(struct sockaddr_in *sin, u32 prog, u32 vers, int prot) 410 { 411 struct rpcbind_args map = { 412 .r_prog = prog, 413 .r_vers = vers, 414 .r_prot = prot, 415 .r_port = 0, 416 }; 417 struct rpc_message msg = { 418 .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT], 419 .rpc_argp = &map, 420 .rpc_resp = &map.r_port, 421 }; 422 struct rpc_clnt *rpcb_clnt; 423 int status; 424 425 dprintk("RPC: %s(" NIPQUAD_FMT ", %u, %u, %d)\n", 426 __func__, NIPQUAD(sin->sin_addr.s_addr), prog, vers, prot); 427 428 rpcb_clnt = rpcb_create(NULL, (struct sockaddr *)sin, 429 sizeof(*sin), prot, RPCBVERS_2); 430 if (IS_ERR(rpcb_clnt)) 431 return PTR_ERR(rpcb_clnt); 432 433 status = rpc_call_sync(rpcb_clnt, &msg, 0); 434 rpc_shutdown_client(rpcb_clnt); 435 436 if (status >= 0) { 437 if (map.r_port != 0) 438 return map.r_port; 439 status = -EACCES; 440 } 441 return status; 442 } 443 EXPORT_SYMBOL_GPL(rpcb_getport_sync); 444 445 static struct rpc_task *rpcb_call_async(struct rpc_clnt *rpcb_clnt, struct rpcbind_args *map, struct rpc_procinfo *proc) 446 { 447 struct rpc_message msg = { 448 .rpc_proc = proc, 449 .rpc_argp = map, 450 .rpc_resp = &map->r_port, 451 }; 452 struct rpc_task_setup task_setup_data = { 453 .rpc_client = rpcb_clnt, 454 .rpc_message = &msg, 455 .callback_ops = &rpcb_getport_ops, 456 .callback_data = map, 457 .flags = RPC_TASK_ASYNC, 458 }; 459 460 return rpc_run_task(&task_setup_data); 461 } 462 463 /** 464 * rpcb_getport_async - obtain the port for a given RPC service on a given host 465 * @task: task that is waiting for portmapper request 466 * 467 * This one can be called for an ongoing RPC request, and can be used in 468 * an async (rpciod) context. 469 */ 470 void rpcb_getport_async(struct rpc_task *task) 471 { 472 struct rpc_clnt *clnt = task->tk_client; 473 struct rpc_procinfo *proc; 474 u32 bind_version; 475 struct rpc_xprt *xprt = task->tk_xprt; 476 struct rpc_clnt *rpcb_clnt; 477 static struct rpcbind_args *map; 478 struct rpc_task *child; 479 struct sockaddr_storage addr; 480 struct sockaddr *sap = (struct sockaddr *)&addr; 481 size_t salen; 482 int status; 483 484 dprintk("RPC: %5u %s(%s, %u, %u, %d)\n", 485 task->tk_pid, __func__, 486 clnt->cl_server, clnt->cl_prog, clnt->cl_vers, xprt->prot); 487 488 /* Autobind on cloned rpc clients is discouraged */ 489 BUG_ON(clnt->cl_parent != clnt); 490 491 /* Put self on the wait queue to ensure we get notified if 492 * some other task is already attempting to bind the port */ 493 rpc_sleep_on(&xprt->binding, task, NULL); 494 495 if (xprt_test_and_set_binding(xprt)) { 496 dprintk("RPC: %5u %s: waiting for another binder\n", 497 task->tk_pid, __func__); 498 return; 499 } 500 501 /* Someone else may have bound if we slept */ 502 if (xprt_bound(xprt)) { 503 status = 0; 504 dprintk("RPC: %5u %s: already bound\n", 505 task->tk_pid, __func__); 506 goto bailout_nofree; 507 } 508 509 salen = rpc_peeraddr(clnt, sap, sizeof(addr)); 510 511 /* Don't ever use rpcbind v2 for AF_INET6 requests */ 512 switch (sap->sa_family) { 513 case AF_INET: 514 proc = rpcb_next_version[xprt->bind_index].rpc_proc; 515 bind_version = rpcb_next_version[xprt->bind_index].rpc_vers; 516 break; 517 case AF_INET6: 518 proc = rpcb_next_version6[xprt->bind_index].rpc_proc; 519 bind_version = rpcb_next_version6[xprt->bind_index].rpc_vers; 520 break; 521 default: 522 status = -EAFNOSUPPORT; 523 dprintk("RPC: %5u %s: bad address family\n", 524 task->tk_pid, __func__); 525 goto bailout_nofree; 526 } 527 if (proc == NULL) { 528 xprt->bind_index = 0; 529 status = -EPFNOSUPPORT; 530 dprintk("RPC: %5u %s: no more getport versions available\n", 531 task->tk_pid, __func__); 532 goto bailout_nofree; 533 } 534 535 dprintk("RPC: %5u %s: trying rpcbind version %u\n", 536 task->tk_pid, __func__, bind_version); 537 538 rpcb_clnt = rpcb_create(clnt->cl_server, sap, salen, xprt->prot, 539 bind_version); 540 if (IS_ERR(rpcb_clnt)) { 541 status = PTR_ERR(rpcb_clnt); 542 dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n", 543 task->tk_pid, __func__, PTR_ERR(rpcb_clnt)); 544 goto bailout_nofree; 545 } 546 547 map = kzalloc(sizeof(struct rpcbind_args), GFP_ATOMIC); 548 if (!map) { 549 status = -ENOMEM; 550 dprintk("RPC: %5u %s: no memory available\n", 551 task->tk_pid, __func__); 552 goto bailout_nofree; 553 } 554 map->r_prog = clnt->cl_prog; 555 map->r_vers = clnt->cl_vers; 556 map->r_prot = xprt->prot; 557 map->r_port = 0; 558 map->r_xprt = xprt_get(xprt); 559 map->r_netid = rpc_peeraddr2str(clnt, RPC_DISPLAY_NETID); 560 map->r_addr = rpc_peeraddr2str(rpcb_clnt, RPC_DISPLAY_UNIVERSAL_ADDR); 561 map->r_owner = RPCB_OWNER_STRING; /* ignored for GETADDR */ 562 map->r_status = -EIO; 563 564 child = rpcb_call_async(rpcb_clnt, map, proc); 565 rpc_release_client(rpcb_clnt); 566 if (IS_ERR(child)) { 567 /* rpcb_map_release() has freed the arguments */ 568 dprintk("RPC: %5u %s: rpc_run_task failed\n", 569 task->tk_pid, __func__); 570 return; 571 } 572 rpc_put_task(child); 573 574 task->tk_xprt->stat.bind_count++; 575 return; 576 577 bailout_nofree: 578 rpcb_wake_rpcbind_waiters(xprt, status); 579 task->tk_status = status; 580 } 581 EXPORT_SYMBOL_GPL(rpcb_getport_async); 582 583 /* 584 * Rpcbind child task calls this callback via tk_exit. 585 */ 586 static void rpcb_getport_done(struct rpc_task *child, void *data) 587 { 588 struct rpcbind_args *map = data; 589 struct rpc_xprt *xprt = map->r_xprt; 590 int status = child->tk_status; 591 592 /* Garbage reply: retry with a lesser rpcbind version */ 593 if (status == -EIO) 594 status = -EPROTONOSUPPORT; 595 596 /* rpcbind server doesn't support this rpcbind protocol version */ 597 if (status == -EPROTONOSUPPORT) 598 xprt->bind_index++; 599 600 if (status < 0) { 601 /* rpcbind server not available on remote host? */ 602 xprt->ops->set_port(xprt, 0); 603 } else if (map->r_port == 0) { 604 /* Requested RPC service wasn't registered on remote host */ 605 xprt->ops->set_port(xprt, 0); 606 status = -EACCES; 607 } else { 608 /* Succeeded */ 609 xprt->ops->set_port(xprt, map->r_port); 610 xprt_set_bound(xprt); 611 status = 0; 612 } 613 614 dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n", 615 child->tk_pid, status, map->r_port); 616 617 map->r_status = status; 618 } 619 620 /* 621 * XDR functions for rpcbind 622 */ 623 624 static int rpcb_encode_mapping(struct rpc_rqst *req, __be32 *p, 625 struct rpcbind_args *rpcb) 626 { 627 dprintk("RPC: encoding rpcb request (%u, %u, %d, %u)\n", 628 rpcb->r_prog, rpcb->r_vers, rpcb->r_prot, rpcb->r_port); 629 *p++ = htonl(rpcb->r_prog); 630 *p++ = htonl(rpcb->r_vers); 631 *p++ = htonl(rpcb->r_prot); 632 *p++ = htonl(rpcb->r_port); 633 634 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); 635 return 0; 636 } 637 638 static int rpcb_decode_getport(struct rpc_rqst *req, __be32 *p, 639 unsigned short *portp) 640 { 641 *portp = (unsigned short) ntohl(*p++); 642 dprintk("RPC: rpcb getport result: %u\n", 643 *portp); 644 return 0; 645 } 646 647 static int rpcb_decode_set(struct rpc_rqst *req, __be32 *p, 648 unsigned int *boolp) 649 { 650 *boolp = (unsigned int) ntohl(*p++); 651 dprintk("RPC: rpcb set/unset call %s\n", 652 (*boolp ? "succeeded" : "failed")); 653 return 0; 654 } 655 656 static int rpcb_encode_getaddr(struct rpc_rqst *req, __be32 *p, 657 struct rpcbind_args *rpcb) 658 { 659 dprintk("RPC: encoding rpcb request (%u, %u, %s)\n", 660 rpcb->r_prog, rpcb->r_vers, rpcb->r_addr); 661 *p++ = htonl(rpcb->r_prog); 662 *p++ = htonl(rpcb->r_vers); 663 664 p = xdr_encode_string(p, rpcb->r_netid); 665 p = xdr_encode_string(p, rpcb->r_addr); 666 p = xdr_encode_string(p, rpcb->r_owner); 667 668 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); 669 670 return 0; 671 } 672 673 static int rpcb_decode_getaddr(struct rpc_rqst *req, __be32 *p, 674 unsigned short *portp) 675 { 676 char *addr; 677 u32 addr_len; 678 int c, i, f, first, val; 679 680 *portp = 0; 681 addr_len = ntohl(*p++); 682 683 /* 684 * Simple sanity check. The smallest possible universal 685 * address is an IPv4 address string containing 11 bytes. 686 */ 687 if (addr_len < 11 || addr_len > RPCBIND_MAXUADDRLEN) 688 goto out_err; 689 690 /* 691 * Start at the end and walk backwards until the first dot 692 * is encountered. When the second dot is found, we have 693 * both parts of the port number. 694 */ 695 addr = (char *)p; 696 val = 0; 697 first = 1; 698 f = 1; 699 for (i = addr_len - 1; i > 0; i--) { 700 c = addr[i]; 701 if (c >= '0' && c <= '9') { 702 val += (c - '0') * f; 703 f *= 10; 704 } else if (c == '.') { 705 if (first) { 706 *portp = val; 707 val = first = 0; 708 f = 1; 709 } else { 710 *portp |= (val << 8); 711 break; 712 } 713 } 714 } 715 716 /* 717 * Simple sanity check. If we never saw a dot in the reply, 718 * then this was probably just garbage. 719 */ 720 if (first) 721 goto out_err; 722 723 dprintk("RPC: rpcb_decode_getaddr port=%u\n", *portp); 724 return 0; 725 726 out_err: 727 dprintk("RPC: rpcbind server returned malformed reply\n"); 728 return -EIO; 729 } 730 731 #define RPCB_program_sz (1u) 732 #define RPCB_version_sz (1u) 733 #define RPCB_protocol_sz (1u) 734 #define RPCB_port_sz (1u) 735 #define RPCB_boolean_sz (1u) 736 737 #define RPCB_netid_sz (1+XDR_QUADLEN(RPCBIND_MAXNETIDLEN)) 738 #define RPCB_addr_sz (1+XDR_QUADLEN(RPCBIND_MAXUADDRLEN)) 739 #define RPCB_ownerstring_sz (1+XDR_QUADLEN(RPCB_MAXOWNERLEN)) 740 741 #define RPCB_mappingargs_sz RPCB_program_sz+RPCB_version_sz+ \ 742 RPCB_protocol_sz+RPCB_port_sz 743 #define RPCB_getaddrargs_sz RPCB_program_sz+RPCB_version_sz+ \ 744 RPCB_netid_sz+RPCB_addr_sz+ \ 745 RPCB_ownerstring_sz 746 747 #define RPCB_setres_sz RPCB_boolean_sz 748 #define RPCB_getportres_sz RPCB_port_sz 749 750 /* 751 * Note that RFC 1833 does not put any size restrictions on the 752 * address string returned by the remote rpcbind database. 753 */ 754 #define RPCB_getaddrres_sz RPCB_addr_sz 755 756 #define PROC(proc, argtype, restype) \ 757 [RPCBPROC_##proc] = { \ 758 .p_proc = RPCBPROC_##proc, \ 759 .p_encode = (kxdrproc_t) rpcb_encode_##argtype, \ 760 .p_decode = (kxdrproc_t) rpcb_decode_##restype, \ 761 .p_arglen = RPCB_##argtype##args_sz, \ 762 .p_replen = RPCB_##restype##res_sz, \ 763 .p_statidx = RPCBPROC_##proc, \ 764 .p_timer = 0, \ 765 .p_name = #proc, \ 766 } 767 768 /* 769 * Not all rpcbind procedures described in RFC 1833 are implemented 770 * since the Linux kernel RPC code requires only these. 771 */ 772 static struct rpc_procinfo rpcb_procedures2[] = { 773 PROC(SET, mapping, set), 774 PROC(UNSET, mapping, set), 775 PROC(GETPORT, mapping, getport), 776 }; 777 778 static struct rpc_procinfo rpcb_procedures3[] = { 779 PROC(SET, getaddr, set), 780 PROC(UNSET, getaddr, set), 781 PROC(GETADDR, getaddr, getaddr), 782 }; 783 784 static struct rpc_procinfo rpcb_procedures4[] = { 785 PROC(SET, getaddr, set), 786 PROC(UNSET, getaddr, set), 787 PROC(GETADDR, getaddr, getaddr), 788 PROC(GETVERSADDR, getaddr, getaddr), 789 }; 790 791 static struct rpcb_info rpcb_next_version[] = { 792 { 793 .rpc_vers = RPCBVERS_2, 794 .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT], 795 }, 796 { 797 .rpc_proc = NULL, 798 }, 799 }; 800 801 static struct rpcb_info rpcb_next_version6[] = { 802 { 803 .rpc_vers = RPCBVERS_4, 804 .rpc_proc = &rpcb_procedures4[RPCBPROC_GETADDR], 805 }, 806 { 807 .rpc_vers = RPCBVERS_3, 808 .rpc_proc = &rpcb_procedures3[RPCBPROC_GETADDR], 809 }, 810 { 811 .rpc_proc = NULL, 812 }, 813 }; 814 815 static struct rpc_version rpcb_version2 = { 816 .number = RPCBVERS_2, 817 .nrprocs = RPCB_HIGHPROC_2, 818 .procs = rpcb_procedures2 819 }; 820 821 static struct rpc_version rpcb_version3 = { 822 .number = RPCBVERS_3, 823 .nrprocs = RPCB_HIGHPROC_3, 824 .procs = rpcb_procedures3 825 }; 826 827 static struct rpc_version rpcb_version4 = { 828 .number = RPCBVERS_4, 829 .nrprocs = RPCB_HIGHPROC_4, 830 .procs = rpcb_procedures4 831 }; 832 833 static struct rpc_version *rpcb_version[] = { 834 NULL, 835 NULL, 836 &rpcb_version2, 837 &rpcb_version3, 838 &rpcb_version4 839 }; 840 841 static struct rpc_stat rpcb_stats; 842 843 static struct rpc_program rpcb_program = { 844 .name = "rpcbind", 845 .number = RPCBIND_PROGRAM, 846 .nrvers = ARRAY_SIZE(rpcb_version), 847 .version = rpcb_version, 848 .stats = &rpcb_stats, 849 }; 850