net/sunrpc/rpcb_clnt.c

   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
  24 #include <linux/sunrpc/clnt.h>
  25 #include <linux/sunrpc/sched.h>
  26 #include <linux/sunrpc/xprtsock.h>
  27
  28 #ifdef RPC_DEBUG
  29 # define RPCDBG_FACILITY        RPCDBG_BIND
  30 #endif
  31
  32 #define RPCBIND_PROGRAM         (100000u)
  33 #define RPCBIND_PORT            (111u)
  34
  35 enum {
  36         RPCBPROC_NULL,
  37         RPCBPROC_SET,
  38         RPCBPROC_UNSET,
  39         RPCBPROC_GETPORT,
  40         RPCBPROC_GETADDR = 3,           /* alias for GETPORT */
  41         RPCBPROC_DUMP,
  42         RPCBPROC_CALLIT,
  43         RPCBPROC_BCAST = 5,             /* alias for CALLIT */
  44         RPCBPROC_GETTIME,
  45         RPCBPROC_UADDR2TADDR,
  46         RPCBPROC_TADDR2UADDR,
  47         RPCBPROC_GETVERSADDR,
  48         RPCBPROC_INDIRECT,
  49         RPCBPROC_GETADDRLIST,
  50         RPCBPROC_GETSTAT,
  51 };
  52
  53 #define RPCB_HIGHPROC_2         RPCBPROC_CALLIT
  54 #define RPCB_HIGHPROC_3         RPCBPROC_TADDR2UADDR
  55 #define RPCB_HIGHPROC_4         RPCBPROC_GETSTAT
  56
  57 /*
  58  * r_addr
  59  *
  60  * Quoting RFC 3530, section 2.2:
  61  *
  62  * For TCP over IPv4 and for UDP over IPv4, the format of r_addr is the
  63  * US-ASCII string:
  64  *
  65  *      h1.h2.h3.h4.p1.p2
  66  *
  67  * The prefix, "h1.h2.h3.h4", is the standard textual form for
  68  * representing an IPv4 address, which is always four octets long.
  69  * Assuming big-endian ordering, h1, h2, h3, and h4, are respectively,
  70  * the first through fourth octets each converted to ASCII-decimal.
  71  * Assuming big-endian ordering, p1 and p2 are, respectively, the first
  72  * and second octets each converted to ASCII-decimal.  For example, if a
  73  * host, in big-endian order, has an address of 0x0A010307 and there is
  74  * a service listening on, in big endian order, port 0x020F (decimal
  75  * 527), then the complete universal address is "10.1.3.7.2.15".
  76  *
  77  * ...
  78  *
  79  * For TCP over IPv6 and for UDP over IPv6, the format of r_addr is the
  80  * US-ASCII string:
  81  *
  82  *      x1:x2:x3:x4:x5:x6:x7:x8.p1.p2
  83  *
  84  * The suffix "p1.p2" is the service port, and is computed the same way
  85  * as with universal addresses for TCP and UDP over IPv4.  The prefix,
  86  * "x1:x2:x3:x4:x5:x6:x7:x8", is the standard textual form for
  87  * representing an IPv6 address as defined in Section 2.2 of [RFC2373].
  88  * Additionally, the two alternative forms specified in Section 2.2 of
  89  * [RFC2373] are also acceptable.
  90  *
  91  * XXX: Currently this implementation does not explicitly convert the
  92  *      stored address to US-ASCII on non-ASCII systems.
  93  */
  94 #define RPCB_MAXADDRLEN         (128u)
  95
  96 /*
  97  * r_owner
  98  *
  99  * The "owner" is allowed to unset a service in the rpcbind database.
 100  * We always use the following (arbitrary) fixed string.
 101  */
 102 #define RPCB_OWNER_STRING       "rpcb"
 103 #define RPCB_MAXOWNERLEN        sizeof(RPCB_OWNER_STRING)
 104
 105 static void                     rpcb_getport_done(struct rpc_task *, void *);
 106 static struct rpc_program       rpcb_program;
 107
 108 struct rpcbind_args {
 109         struct rpc_xprt *       r_xprt;
 110
 111         u32                     r_prog;
 112         u32                     r_vers;
 113         u32                     r_prot;
 114         unsigned short          r_port;
 115         char *                  r_netid;
 116         char                    r_addr[RPCB_MAXADDRLEN];
 117         char *                  r_owner;
 118 };
 119
 120 static struct rpc_procinfo rpcb_procedures2[];
 121 static struct rpc_procinfo rpcb_procedures3[];
 122
 123 struct rpcb_info {
 124         int                     rpc_vers;
 125         struct rpc_procinfo *   rpc_proc;
 126 };
 127
 128 static struct rpcb_info rpcb_next_version[];
 129 static struct rpcb_info rpcb_next_version6[];
 130
 131 static void rpcb_map_release(void *data)
 132 {
 133         struct rpcbind_args *map = data;
 134
 135         xprt_put(map->r_xprt);
 136         kfree(map);
 137 }
 138
 139 static const struct rpc_call_ops rpcb_getport_ops = {
 140         .rpc_call_done          = rpcb_getport_done,
 141         .rpc_release            = rpcb_map_release,
 142 };
 143
 144 static void rpcb_wake_rpcbind_waiters(struct rpc_xprt *xprt, int status)
 145 {
 146         xprt_clear_binding(xprt);
 147         rpc_wake_up_status(&xprt->binding, status);
 148 }
 149
 150 static struct rpc_clnt *rpcb_create(char *hostname, struct sockaddr *srvaddr,
 151                                     size_t salen, int proto, int version,
 152                                     int privileged)
 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_INTR),
 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         if (!privileged)
 178                 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
 179         return rpc_create(&args);
 180 }
 181
 182 /**
 183  * rpcb_register - set or unset a port registration with the local rpcbind svc
 184  * @prog: RPC program number to bind
 185  * @vers: RPC version number to bind
 186  * @prot: transport protocol to use to make this request
 187  * @port: port value to register
 188  * @okay: result code
 189  *
 190  * port == 0 means unregister, port != 0 means register.
 191  *
 192  * This routine supports only rpcbind version 2.
 193  */
 194 int rpcb_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay)
 195 {
 196         struct sockaddr_in sin = {
 197                 .sin_family             = AF_INET,
 198                 .sin_addr.s_addr        = htonl(INADDR_LOOPBACK),
 199         };
 200         struct rpcbind_args map = {
 201                 .r_prog         = prog,
 202                 .r_vers         = vers,
 203                 .r_prot         = prot,
 204                 .r_port         = port,
 205         };
 206         struct rpc_message msg = {
 207                 .rpc_proc       = &rpcb_procedures2[port ?
 208                                         RPCBPROC_SET : RPCBPROC_UNSET],
 209                 .rpc_argp       = &map,
 210                 .rpc_resp       = okay,
 211         };
 212         struct rpc_clnt *rpcb_clnt;
 213         int error = 0;
 214
 215         dprintk("RPC:       %sregistering (%u, %u, %d, %u) with local "
 216                         "rpcbind\n", (port ? "" : "un"),
 217                         prog, vers, prot, port);
 218
 219         rpcb_clnt = rpcb_create("localhost", (struct sockaddr *) &sin,
 220                                 sizeof(sin), XPRT_TRANSPORT_UDP, 2, 1);
 221         if (IS_ERR(rpcb_clnt))
 222                 return PTR_ERR(rpcb_clnt);
 223
 224         error = rpc_call_sync(rpcb_clnt, &msg, 0);
 225
 226         rpc_shutdown_client(rpcb_clnt);
 227         if (error < 0)
 228                 printk(KERN_WARNING "RPC: failed to contact local rpcbind "
 229                                 "server (errno %d).\n", -error);
 230         dprintk("RPC:       registration status %d/%d\n", error, *okay);
 231
 232         return error;
 233 }
 234
 235 /**
 236  * rpcb_getport_sync - obtain the port for an RPC service on a given host
 237  * @sin: address of remote peer
 238  * @prog: RPC program number to bind
 239  * @vers: RPC version number to bind
 240  * @prot: transport protocol to use to make this request
 241  *
 242  * Called from outside the RPC client in a synchronous task context.
 243  * Uses default timeout parameters specified by underlying transport.
 244  *
 245  * XXX: Needs to support IPv6, and rpcbind versions 3 and 4
 246  */
 247 int rpcb_getport_sync(struct sockaddr_in *sin, __u32 prog,
 248                       __u32 vers, int prot)
 249 {
 250         struct rpcbind_args map = {
 251                 .r_prog         = prog,
 252                 .r_vers         = vers,
 253                 .r_prot         = prot,
 254                 .r_port         = 0,
 255         };
 256         struct rpc_message msg = {
 257                 .rpc_proc       = &rpcb_procedures2[RPCBPROC_GETPORT],
 258                 .rpc_argp       = &map,
 259                 .rpc_resp       = &map.r_port,
 260         };
 261         struct rpc_clnt *rpcb_clnt;
 262         char hostname[40];
 263         int status;
 264
 265         dprintk("RPC:       %s(" NIPQUAD_FMT ", %u, %u, %d)\n",
 266                 __FUNCTION__, NIPQUAD(sin->sin_addr.s_addr), prog, vers, prot);
 267
 268         sprintf(hostname, NIPQUAD_FMT, NIPQUAD(sin->sin_addr.s_addr));
 269         rpcb_clnt = rpcb_create(hostname, (struct sockaddr *)sin,
 270                                 sizeof(sin), prot, 2, 0);
 271         if (IS_ERR(rpcb_clnt))
 272                 return PTR_ERR(rpcb_clnt);
 273
 274         status = rpc_call_sync(rpcb_clnt, &msg, 0);
 275         rpc_shutdown_client(rpcb_clnt);
 276
 277         if (status >= 0) {
 278                 if (map.r_port != 0)
 279                         return map.r_port;
 280                 status = -EACCES;
 281         }
 282         return status;
 283 }
 284 EXPORT_SYMBOL_GPL(rpcb_getport_sync);
 285
 286 static struct rpc_task *rpcb_call_async(struct rpc_clnt *rpcb_clnt, struct rpcbind_args *map, int version)
 287 {
 288         struct rpc_message msg = {
 289                 .rpc_proc = rpcb_next_version[version].rpc_proc,
 290                 .rpc_argp = map,
 291                 .rpc_resp = &map->r_port,
 292         };
 293         struct rpc_task_setup task_setup_data = {
 294                 .rpc_client = rpcb_clnt,
 295                 .rpc_message = &msg,
 296                 .callback_ops = &rpcb_getport_ops,
 297                 .callback_data = map,
 298                 .flags = RPC_TASK_ASYNC,
 299         };
 300
 301         return rpc_run_task(&task_setup_data);
 302 }
 303
 304 /**
 305  * rpcb_getport_async - obtain the port for a given RPC service on a given host
 306  * @task: task that is waiting for portmapper request
 307  *
 308  * This one can be called for an ongoing RPC request, and can be used in
 309  * an async (rpciod) context.
 310  */
 311 void rpcb_getport_async(struct rpc_task *task)
 312 {
 313         struct rpc_clnt *clnt = task->tk_client;
 314         int bind_version;
 315         struct rpc_xprt *xprt = task->tk_xprt;
 316         struct rpc_clnt *rpcb_clnt;
 317         static struct rpcbind_args *map;
 318         struct rpc_task *child;
 319         struct sockaddr_storage addr;
 320         struct sockaddr *sap = (struct sockaddr *)&addr;
 321         size_t salen;
 322         int status;
 323         struct rpcb_info *info;
 324
 325         dprintk("RPC: %5u %s(%s, %u, %u, %d)\n",
 326                 task->tk_pid, __FUNCTION__,
 327                 clnt->cl_server, clnt->cl_prog, clnt->cl_vers, xprt->prot);
 328
 329         /* Autobind on cloned rpc clients is discouraged */
 330         BUG_ON(clnt->cl_parent != clnt);
 331
 332         if (xprt_test_and_set_binding(xprt)) {
 333                 status = -EAGAIN;       /* tell caller to check again */
 334                 dprintk("RPC: %5u %s: waiting for another binder\n",
 335                         task->tk_pid, __FUNCTION__);
 336                 goto bailout_nowake;
 337         }
 338
 339         /* Put self on queue before sending rpcbind request, in case
 340          * rpcb_getport_done completes before we return from rpc_run_task */
 341         rpc_sleep_on(&xprt->binding, task, NULL, NULL);
 342
 343         /* Someone else may have bound if we slept */
 344         if (xprt_bound(xprt)) {
 345                 status = 0;
 346                 dprintk("RPC: %5u %s: already bound\n",
 347                         task->tk_pid, __FUNCTION__);
 348                 goto bailout_nofree;
 349         }
 350
 351         salen = rpc_peeraddr(clnt, sap, sizeof(addr));
 352
 353         /* Don't ever use rpcbind v2 for AF_INET6 requests */
 354         switch (sap->sa_family) {
 355         case AF_INET:
 356                 info = rpcb_next_version;
 357                 break;
 358         case AF_INET6:
 359                 info = rpcb_next_version6;
 360                 break;
 361         default:
 362                 status = -EAFNOSUPPORT;
 363                 dprintk("RPC: %5u %s: bad address family\n",
 364                                 task->tk_pid, __FUNCTION__);
 365                 goto bailout_nofree;
 366         }
 367         if (info[xprt->bind_index].rpc_proc == NULL) {
 368                 xprt->bind_index = 0;
 369                 status = -EPFNOSUPPORT;
 370                 dprintk("RPC: %5u %s: no more getport versions available\n",
 371                         task->tk_pid, __FUNCTION__);
 372                 goto bailout_nofree;
 373         }
 374         bind_version = info[xprt->bind_index].rpc_vers;
 375
 376         dprintk("RPC: %5u %s: trying rpcbind version %u\n",
 377                 task->tk_pid, __FUNCTION__, bind_version);
 378
 379         rpcb_clnt = rpcb_create(clnt->cl_server, sap, salen, xprt->prot,
 380                                 bind_version, 0);
 381         if (IS_ERR(rpcb_clnt)) {
 382                 status = PTR_ERR(rpcb_clnt);
 383                 dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n",
 384                         task->tk_pid, __FUNCTION__, PTR_ERR(rpcb_clnt));
 385                 goto bailout_nofree;
 386         }
 387
 388         map = kzalloc(sizeof(struct rpcbind_args), GFP_ATOMIC);
 389         if (!map) {
 390                 status = -ENOMEM;
 391                 dprintk("RPC: %5u %s: no memory available\n",
 392                         task->tk_pid, __FUNCTION__);
 393                 goto bailout_nofree;
 394         }
 395         map->r_prog = clnt->cl_prog;
 396         map->r_vers = clnt->cl_vers;
 397         map->r_prot = xprt->prot;
 398         map->r_port = 0;
 399         map->r_xprt = xprt_get(xprt);
 400         map->r_netid = rpc_peeraddr2str(clnt, RPC_DISPLAY_NETID);
 401         memcpy(map->r_addr,
 402                rpc_peeraddr2str(rpcb_clnt, RPC_DISPLAY_UNIVERSAL_ADDR),
 403                sizeof(map->r_addr));
 404         map->r_owner = RPCB_OWNER_STRING;       /* ignored for GETADDR */
 405
 406         child = rpcb_call_async(rpcb_clnt, map, xprt->bind_index);
 407         rpc_release_client(rpcb_clnt);
 408         if (IS_ERR(child)) {
 409                 status = -EIO;
 410                 dprintk("RPC: %5u %s: rpc_run_task failed\n",
 411                         task->tk_pid, __FUNCTION__);
 412                 goto bailout;
 413         }
 414         rpc_put_task(child);
 415
 416         task->tk_xprt->stat.bind_count++;
 417         return;
 418
 419 bailout:
 420         kfree(map);
 421         xprt_put(xprt);
 422 bailout_nofree:
 423         rpcb_wake_rpcbind_waiters(xprt, status);
 424 bailout_nowake:
 425         task->tk_status = status;
 426 }
 427 EXPORT_SYMBOL_GPL(rpcb_getport_async);
 428
 429 /*
 430  * Rpcbind child task calls this callback via tk_exit.
 431  */
 432 static void rpcb_getport_done(struct rpc_task *child, void *data)
 433 {
 434         struct rpcbind_args *map = data;
 435         struct rpc_xprt *xprt = map->r_xprt;
 436         int status = child->tk_status;
 437
 438         /* Garbage reply: retry with a lesser rpcbind version */
 439         if (status == -EIO)
 440                 status = -EPROTONOSUPPORT;
 441
 442         /* rpcbind server doesn't support this rpcbind protocol version */
 443         if (status == -EPROTONOSUPPORT)
 444                 xprt->bind_index++;
 445
 446         if (status < 0) {
 447                 /* rpcbind server not available on remote host? */
 448                 xprt->ops->set_port(xprt, 0);
 449         } else if (map->r_port == 0) {
 450                 /* Requested RPC service wasn't registered on remote host */
 451                 xprt->ops->set_port(xprt, 0);
 452                 status = -EACCES;
 453         } else {
 454                 /* Succeeded */
 455                 xprt->ops->set_port(xprt, map->r_port);
 456                 xprt_set_bound(xprt);
 457                 status = 0;
 458         }
 459
 460         dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n",
 461                         child->tk_pid, status, map->r_port);
 462
 463         rpcb_wake_rpcbind_waiters(xprt, status);
 464 }
 465
 466 static int rpcb_encode_mapping(struct rpc_rqst *req, __be32 *p,
 467                                struct rpcbind_args *rpcb)
 468 {
 469         dprintk("RPC:       rpcb_encode_mapping(%u, %u, %d, %u)\n",
 470                         rpcb->r_prog, rpcb->r_vers, rpcb->r_prot, rpcb->r_port);
 471         *p++ = htonl(rpcb->r_prog);
 472         *p++ = htonl(rpcb->r_vers);
 473         *p++ = htonl(rpcb->r_prot);
 474         *p++ = htonl(rpcb->r_port);
 475
 476         req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
 477         return 0;
 478 }
 479
 480 static int rpcb_decode_getport(struct rpc_rqst *req, __be32 *p,
 481                                unsigned short *portp)
 482 {
 483         *portp = (unsigned short) ntohl(*p++);
 484         dprintk("RPC:      rpcb_decode_getport result %u\n",
 485                         *portp);
 486         return 0;
 487 }
 488
 489 static int rpcb_decode_set(struct rpc_rqst *req, __be32 *p,
 490                            unsigned int *boolp)
 491 {
 492         *boolp = (unsigned int) ntohl(*p++);
 493         dprintk("RPC:      rpcb_decode_set result %u\n",
 494                         *boolp);
 495         return 0;
 496 }
 497
 498 static int rpcb_encode_getaddr(struct rpc_rqst *req, __be32 *p,
 499                                struct rpcbind_args *rpcb)
 500 {
 501         dprintk("RPC:       rpcb_encode_getaddr(%u, %u, %s)\n",
 502                         rpcb->r_prog, rpcb->r_vers, rpcb->r_addr);
 503         *p++ = htonl(rpcb->r_prog);
 504         *p++ = htonl(rpcb->r_vers);
 505
 506         p = xdr_encode_string(p, rpcb->r_netid);
 507         p = xdr_encode_string(p, rpcb->r_addr);
 508         p = xdr_encode_string(p, rpcb->r_owner);
 509
 510         req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
 511
 512         return 0;
 513 }
 514
 515 static int rpcb_decode_getaddr(struct rpc_rqst *req, __be32 *p,
 516                                unsigned short *portp)
 517 {
 518         char *addr;
 519         u32 addr_len;
 520         int c, i, f, first, val;
 521
 522         *portp = 0;
 523         addr_len = ntohl(*p++);
 524
 525         /*
 526          * Simple sanity check.  The smallest possible universal
 527          * address is an IPv4 address string containing 11 bytes.
 528          */
 529         if (addr_len < 11 || addr_len > RPCB_MAXADDRLEN)
 530                 goto out_err;
 531
 532         /*
 533          * Start at the end and walk backwards until the first dot
 534          * is encountered.  When the second dot is found, we have
 535          * both parts of the port number.
 536          */
 537         addr = (char *)p;
 538         val = 0;
 539         first = 1;
 540         f = 1;
 541         for (i = addr_len - 1; i > 0; i--) {
 542                 c = addr[i];
 543                 if (c >= '0' && c <= '9') {
 544                         val += (c - '0') * f;
 545                         f *= 10;
 546                 } else if (c == '.') {
 547                         if (first) {
 548                                 *portp = val;
 549                                 val = first = 0;
 550                                 f = 1;
 551                         } else {
 552                                 *portp |= (val << 8);
 553                                 break;
 554                         }
 555                 }
 556         }
 557
 558         /*
 559          * Simple sanity check.  If we never saw a dot in the reply,
 560          * then this was probably just garbage.
 561          */
 562         if (first)
 563                 goto out_err;
 564
 565         dprintk("RPC:       rpcb_decode_getaddr port=%u\n", *portp);
 566         return 0;
 567
 568 out_err:
 569         dprintk("RPC:       rpcbind server returned malformed reply\n");
 570         return -EIO;
 571 }
 572
 573 #define RPCB_program_sz         (1u)
 574 #define RPCB_version_sz         (1u)
 575 #define RPCB_protocol_sz        (1u)
 576 #define RPCB_port_sz            (1u)
 577 #define RPCB_boolean_sz         (1u)
 578
 579 #define RPCB_netid_sz           (1+XDR_QUADLEN(RPCBIND_MAXNETIDLEN))
 580 #define RPCB_addr_sz            (1+XDR_QUADLEN(RPCB_MAXADDRLEN))
 581 #define RPCB_ownerstring_sz     (1+XDR_QUADLEN(RPCB_MAXOWNERLEN))
 582
 583 #define RPCB_mappingargs_sz     RPCB_program_sz+RPCB_version_sz+        \
 584                                 RPCB_protocol_sz+RPCB_port_sz
 585 #define RPCB_getaddrargs_sz     RPCB_program_sz+RPCB_version_sz+        \
 586                                 RPCB_netid_sz+RPCB_addr_sz+             \
 587                                 RPCB_ownerstring_sz
 588
 589 #define RPCB_setres_sz          RPCB_boolean_sz
 590 #define RPCB_getportres_sz      RPCB_port_sz
 591
 592 /*
 593  * Note that RFC 1833 does not put any size restrictions on the
 594  * address string returned by the remote rpcbind database.
 595  */
 596 #define RPCB_getaddrres_sz      RPCB_addr_sz
 597
 598 #define PROC(proc, argtype, restype)                                    \
 599         [RPCBPROC_##proc] = {                                           \
 600                 .p_proc         = RPCBPROC_##proc,                      \
 601                 .p_encode       = (kxdrproc_t) rpcb_encode_##argtype,   \
 602                 .p_decode       = (kxdrproc_t) rpcb_decode_##restype,   \
 603                 .p_arglen       = RPCB_##argtype##args_sz,              \
 604                 .p_replen       = RPCB_##restype##res_sz,               \
 605                 .p_statidx      = RPCBPROC_##proc,                      \
 606                 .p_timer        = 0,                                    \
 607                 .p_name         = #proc,                                \
 608         }
 609
 610 /*
 611  * Not all rpcbind procedures described in RFC 1833 are implemented
 612  * since the Linux kernel RPC code requires only these.
 613  */
 614 static struct rpc_procinfo rpcb_procedures2[] = {
 615         PROC(SET,               mapping,        set),
 616         PROC(UNSET,             mapping,        set),
 617         PROC(GETADDR,           mapping,        getport),
 618 };
 619
 620 static struct rpc_procinfo rpcb_procedures3[] = {
 621         PROC(SET,               mapping,        set),
 622         PROC(UNSET,             mapping,        set),
 623         PROC(GETADDR,           getaddr,        getaddr),
 624 };
 625
 626 static struct rpc_procinfo rpcb_procedures4[] = {
 627         PROC(SET,               mapping,        set),
 628         PROC(UNSET,             mapping,        set),
 629         PROC(GETVERSADDR,       getaddr,        getaddr),
 630 };
 631
 632 static struct rpcb_info rpcb_next_version[] = {
 633 #ifdef CONFIG_SUNRPC_BIND34
 634         { 4, &rpcb_procedures4[RPCBPROC_GETVERSADDR] },
 635         { 3, &rpcb_procedures3[RPCBPROC_GETADDR] },
 636 #endif
 637         { 2, &rpcb_procedures2[RPCBPROC_GETPORT] },
 638         { 0, NULL },
 639 };
 640
 641 static struct rpcb_info rpcb_next_version6[] = {
 642 #ifdef CONFIG_SUNRPC_BIND34
 643         { 4, &rpcb_procedures4[RPCBPROC_GETVERSADDR] },
 644         { 3, &rpcb_procedures3[RPCBPROC_GETADDR] },
 645 #endif
 646         { 0, NULL },
 647 };
 648
 649 static struct rpc_version rpcb_version2 = {
 650         .number         = 2,
 651         .nrprocs        = RPCB_HIGHPROC_2,
 652         .procs          = rpcb_procedures2
 653 };
 654
 655 static struct rpc_version rpcb_version3 = {
 656         .number         = 3,
 657         .nrprocs        = RPCB_HIGHPROC_3,
 658         .procs          = rpcb_procedures3
 659 };
 660
 661 static struct rpc_version rpcb_version4 = {
 662         .number         = 4,
 663         .nrprocs        = RPCB_HIGHPROC_4,
 664         .procs          = rpcb_procedures4
 665 };
 666
 667 static struct rpc_version *rpcb_version[] = {
 668         NULL,
 669         NULL,
 670         &rpcb_version2,
 671         &rpcb_version3,
 672         &rpcb_version4
 673 };
 674
 675 static struct rpc_stat rpcb_stats;
 676
 677 static struct rpc_program rpcb_program = {
 678         .name           = "rpcbind",
 679         .number         = RPCBIND_PROGRAM,
 680         .nrvers         = ARRAY_SIZE(rpcb_version),
 681         .version        = rpcb_version,
 682         .stats          = &rpcb_stats,
 683 };