Linux 2.6.31.6
[linux/fpc-iii.git] / net / sunrpc / rpcb_clnt.c
blobbeee6da330358cb75ef2e7cb22037d635d0080f0
1 /*
2 * In-kernel rpcbind client supporting versions 2, 3, and 4 of the rpcbind
3 * protocol
5 * Based on RFC 1833: "Binding Protocols for ONC RPC Version 2" and
6 * RFC 3530: "Network File System (NFS) version 4 Protocol"
8 * Original: Gilles Quillard, Bull Open Source, 2005 <gilles.quillard@bull.net>
9 * Updated: Chuck Lever, Oracle Corporation, 2007 <chuck.lever@oracle.com>
11 * Descended from net/sunrpc/pmap_clnt.c,
12 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
15 #include <linux/module.h>
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>
25 #include <linux/sunrpc/clnt.h>
26 #include <linux/sunrpc/sched.h>
27 #include <linux/sunrpc/xprtsock.h>
29 #ifdef RPC_DEBUG
30 # define RPCDBG_FACILITY RPCDBG_BIND
31 #endif
33 #define RPCBIND_PROGRAM (100000u)
34 #define RPCBIND_PORT (111u)
36 #define RPCBVERS_2 (2u)
37 #define RPCBVERS_3 (3u)
38 #define RPCBVERS_4 (4u)
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,
58 #define RPCB_HIGHPROC_2 RPCBPROC_CALLIT
59 #define RPCB_HIGHPROC_3 RPCBPROC_TADDR2UADDR
60 #define RPCB_HIGHPROC_4 RPCBPROC_GETSTAT
63 * r_owner
65 * The "owner" is allowed to unset a service in the rpcbind database.
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.
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.
75 #define RPCB_OWNER_STRING "0"
76 #define RPCB_MAXOWNERLEN sizeof(RPCB_OWNER_STRING)
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;
82 struct rpcbind_args {
83 struct rpc_xprt * r_xprt;
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;
93 int r_status;
96 static struct rpc_procinfo rpcb_procedures2[];
97 static struct rpc_procinfo rpcb_procedures3[];
98 static struct rpc_procinfo rpcb_procedures4[];
100 struct rpcb_info {
101 u32 rpc_vers;
102 struct rpc_procinfo * rpc_proc;
105 static struct rpcb_info rpcb_next_version[];
106 static struct rpcb_info rpcb_next_version6[];
108 static const struct rpc_call_ops rpcb_getport_ops = {
109 .rpc_call_done = rpcb_getport_done,
110 .rpc_release = rpcb_map_release,
113 static void rpcb_wake_rpcbind_waiters(struct rpc_xprt *xprt, int status)
115 xprt_clear_binding(xprt);
116 rpc_wake_up_status(&xprt->binding, status);
119 static void rpcb_map_release(void *data)
121 struct rpcbind_args *map = data;
123 rpcb_wake_rpcbind_waiters(map->r_xprt, map->r_status);
124 xprt_put(map->r_xprt);
125 kfree(map);
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),
134 static struct rpc_clnt *rpcb_create_local(struct sockaddr *addr,
135 size_t addrlen, u32 version)
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,
148 return rpc_create(&args);
151 static struct rpc_clnt *rpcb_create(char *hostname, struct sockaddr *srvaddr,
152 size_t salen, int proto, u32 version)
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),
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;
177 return rpc_create(&args);
180 static int rpcb_register_call(const u32 version, struct rpc_message *msg)
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;
187 msg->rpc_resp = &result;
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);
196 if (error < 0) {
197 dprintk("RPC: failed to contact local rpcbind "
198 "server (errno %d).\n", -error);
199 return error;
202 if (!result)
203 return -EACCES;
204 return 0;
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
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).
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.
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.
229 * This function uses rpcbind protocol version 2 to contact the
230 * local rpcbind daemon.
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).
239 int rpcb_register(u32 prog, u32 vers, int prot, unsigned short port)
241 struct rpcbind_args map = {
242 .r_prog = prog,
243 .r_vers = vers,
244 .r_prot = prot,
245 .r_port = port,
247 struct rpc_message msg = {
248 .rpc_argp = &map,
251 dprintk("RPC: %sregistering (%u, %u, %d, %u) with local "
252 "rpcbind\n", (port ? "" : "un"),
253 prog, vers, prot, port);
255 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_UNSET];
256 if (port)
257 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_SET];
259 return rpcb_register_call(RPCBVERS_2, &msg);
263 * Fill in AF_INET family-specific arguments to register
265 static int rpcb_register_inet4(const struct sockaddr *sap,
266 struct rpc_message *msg)
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];
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;
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);
283 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
284 if (port)
285 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
287 return rpcb_register_call(RPCBVERS_4, msg);
291 * Fill in AF_INET6 family-specific arguments to register
293 static int rpcb_register_inet6(const struct sockaddr *sap,
294 struct rpc_message *msg)
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];
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;
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);
315 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
316 if (port)
317 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
319 return rpcb_register_call(RPCBVERS_4, msg);
322 static int rpcb_unregister_all_protofamilies(struct rpc_message *msg)
324 struct rpcbind_args *map = msg->rpc_argp;
326 dprintk("RPC: unregistering [%u, %u, '%s'] with "
327 "local rpcbind\n",
328 map->r_prog, map->r_vers, map->r_netid);
330 map->r_addr = "";
331 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
333 return rpcb_register_call(RPCBVERS_4, msg);
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
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).
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.
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.
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.
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.
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.
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.
379 int rpcb_v4_register(const u32 program, const u32 version,
380 const struct sockaddr *address, const char *netid)
382 struct rpcbind_args map = {
383 .r_prog = program,
384 .r_vers = version,
385 .r_netid = netid,
386 .r_owner = RPCB_OWNER_STRING,
388 struct rpc_message msg = {
389 .rpc_argp = &map,
392 if (address == NULL)
393 return rpcb_unregister_all_protofamilies(&msg);
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);
402 return -EAFNOSUPPORT;
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
412 * Return value is the requested advertised port number,
413 * or a negative errno value.
415 * Called from outside the RPC client in a synchronous task context.
416 * Uses default timeout parameters specified by underlying transport.
418 * XXX: Needs to support IPv6
420 int rpcb_getport_sync(struct sockaddr_in *sin, u32 prog, u32 vers, int prot)
422 struct rpcbind_args map = {
423 .r_prog = prog,
424 .r_vers = vers,
425 .r_prot = prot,
426 .r_port = 0,
428 struct rpc_message msg = {
429 .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT],
430 .rpc_argp = &map,
431 .rpc_resp = &map.r_port,
433 struct rpc_clnt *rpcb_clnt;
434 int status;
436 dprintk("RPC: %s(%pI4, %u, %u, %d)\n",
437 __func__, &sin->sin_addr.s_addr, prog, vers, prot);
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);
444 status = rpc_call_sync(rpcb_clnt, &msg, 0);
445 rpc_shutdown_client(rpcb_clnt);
447 if (status >= 0) {
448 if (map.r_port != 0)
449 return map.r_port;
450 status = -EACCES;
452 return status;
454 EXPORT_SYMBOL_GPL(rpcb_getport_sync);
456 static struct rpc_task *rpcb_call_async(struct rpc_clnt *rpcb_clnt, struct rpcbind_args *map, struct rpc_procinfo *proc)
458 struct rpc_message msg = {
459 .rpc_proc = proc,
460 .rpc_argp = map,
461 .rpc_resp = &map->r_port,
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,
471 return rpc_run_task(&task_setup_data);
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.
481 static struct rpc_clnt *rpcb_find_transport_owner(struct rpc_clnt *clnt)
483 struct rpc_clnt *parent = clnt->cl_parent;
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;
493 return clnt;
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
500 * This one can be called for an ongoing RPC request, and can be used in
501 * an async (rpciod) context.
503 void rpcb_getport_async(struct rpc_task *task)
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;
517 clnt = rpcb_find_transport_owner(task->tk_client);
518 xprt = clnt->cl_xprt;
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);
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);
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;
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;
542 salen = rpc_peeraddr(clnt, sap, sizeof(addr));
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;
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;
568 dprintk("RPC: %5u %s: trying rpcbind version %u\n",
569 task->tk_pid, __func__, bind_version);
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;
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;
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;
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;
606 xprt->stat.bind_count++;
607 rpc_put_task(child);
608 return;
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;
616 EXPORT_SYMBOL_GPL(rpcb_getport_async);
619 * Rpcbind child task calls this callback via tk_exit.
621 static void rpcb_getport_done(struct rpc_task *child, void *data)
623 struct rpcbind_args *map = data;
624 struct rpc_xprt *xprt = map->r_xprt;
625 int status = child->tk_status;
627 /* Garbage reply: retry with a lesser rpcbind version */
628 if (status == -EIO)
629 status = -EPROTONOSUPPORT;
631 /* rpcbind server doesn't support this rpcbind protocol version */
632 if (status == -EPROTONOSUPPORT)
633 xprt->bind_index++;
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;
649 dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n",
650 child->tk_pid, status, map->r_port);
652 map->r_status = status;
656 * XDR functions for rpcbind
659 static int rpcb_encode_mapping(struct rpc_rqst *req, __be32 *p,
660 struct rpcbind_args *rpcb)
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);
669 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
670 return 0;
673 static int rpcb_decode_getport(struct rpc_rqst *req, __be32 *p,
674 unsigned short *portp)
676 *portp = (unsigned short) ntohl(*p++);
677 dprintk("RPC: rpcb getport result: %u\n",
678 *portp);
679 return 0;
682 static int rpcb_decode_set(struct rpc_rqst *req, __be32 *p,
683 unsigned int *boolp)
685 *boolp = (unsigned int) ntohl(*p++);
686 dprintk("RPC: rpcb set/unset call %s\n",
687 (*boolp ? "succeeded" : "failed"));
688 return 0;
691 static int rpcb_encode_getaddr(struct rpc_rqst *req, __be32 *p,
692 struct rpcbind_args *rpcb)
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);
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);
703 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
705 return 0;
708 static int rpcb_decode_getaddr(struct rpc_rqst *req, __be32 *p,
709 unsigned short *portp)
711 char *addr;
712 u32 addr_len;
713 int c, i, f, first, val;
715 *portp = 0;
716 addr_len = ntohl(*p++);
718 if (addr_len == 0) {
719 dprintk("RPC: rpcb_decode_getaddr: "
720 "service is not registered\n");
721 return 0;
725 * Simple sanity check.
727 if (addr_len > RPCBIND_MAXUADDRLEN)
728 goto out_err;
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.
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;
757 * Simple sanity check. If we never saw a dot in the reply,
758 * then this was probably just garbage.
760 if (first)
761 goto out_err;
763 dprintk("RPC: rpcb_decode_getaddr port=%u\n", *portp);
764 return 0;
766 out_err:
767 dprintk("RPC: rpcbind server returned malformed reply\n");
768 return -EIO;
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)
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))
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
787 #define RPCB_setres_sz RPCB_boolean_sz
788 #define RPCB_getportres_sz RPCB_port_sz
791 * Note that RFC 1833 does not put any size restrictions on the
792 * address string returned by the remote rpcbind database.
794 #define RPCB_getaddrres_sz RPCB_addr_sz
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, \
809 * Not all rpcbind procedures described in RFC 1833 are implemented
810 * since the Linux kernel RPC code requires only these.
812 static struct rpc_procinfo rpcb_procedures2[] = {
813 PROC(SET, mapping, set),
814 PROC(UNSET, mapping, set),
815 PROC(GETPORT, mapping, getport),
818 static struct rpc_procinfo rpcb_procedures3[] = {
819 PROC(SET, getaddr, set),
820 PROC(UNSET, getaddr, set),
821 PROC(GETADDR, getaddr, getaddr),
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),
831 static struct rpcb_info rpcb_next_version[] = {
833 .rpc_vers = RPCBVERS_2,
834 .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT],
837 .rpc_proc = NULL,
841 static struct rpcb_info rpcb_next_version6[] = {
843 .rpc_vers = RPCBVERS_4,
844 .rpc_proc = &rpcb_procedures4[RPCBPROC_GETADDR],
847 .rpc_vers = RPCBVERS_3,
848 .rpc_proc = &rpcb_procedures3[RPCBPROC_GETADDR],
851 .rpc_proc = NULL,
855 static struct rpc_version rpcb_version2 = {
856 .number = RPCBVERS_2,
857 .nrprocs = RPCB_HIGHPROC_2,
858 .procs = rpcb_procedures2
861 static struct rpc_version rpcb_version3 = {
862 .number = RPCBVERS_3,
863 .nrprocs = RPCB_HIGHPROC_3,
864 .procs = rpcb_procedures3
867 static struct rpc_version rpcb_version4 = {
868 .number = RPCBVERS_4,
869 .nrprocs = RPCB_HIGHPROC_4,
870 .procs = rpcb_procedures4
873 static struct rpc_version *rpcb_version[] = {
874 NULL,
875 NULL,
876 &rpcb_version2,
877 &rpcb_version3,
878 &rpcb_version4
881 static struct rpc_stat rpcb_stats;
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,