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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * In-kernel rpcbind client supporting versions 2, 3, and 4 of the rpcbind
4 * protocol
5 *
6 * Based on RFC 1833: "Binding Protocols for ONC RPC Version 2" and
7 * RFC 3530: "Network File System (NFS) version 4 Protocol"
8 *
9 * Original: Gilles Quillard, Bull Open Source, 2005 <gilles.quillard@bull.net>
10 * Updated: Chuck Lever, Oracle Corporation, 2007 <chuck.lever@oracle.com>
11 *
12 * Descended from net/sunrpc/pmap_clnt.c,
13 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
14 */
15
16#include <linux/module.h>
17
18#include <linux/types.h>
19#include <linux/socket.h>
20#include <linux/un.h>
21#include <linux/in.h>
22#include <linux/in6.h>
23#include <linux/kernel.h>
24#include <linux/errno.h>
25#include <linux/mutex.h>
26#include <linux/slab.h>
27#include <net/ipv6.h>
28
29#include <linux/sunrpc/clnt.h>
30#include <linux/sunrpc/addr.h>
31#include <linux/sunrpc/sched.h>
32#include <linux/sunrpc/xprtsock.h>
33
34#include <trace/events/sunrpc.h>
35
36#include "netns.h"
37
38#define RPCBIND_SOCK_PATHNAME "/var/run/rpcbind.sock"
39
40#define RPCBIND_PROGRAM (100000u)
41#define RPCBIND_PORT (111u)
42
43#define RPCBVERS_2 (2u)
44#define RPCBVERS_3 (3u)
45#define RPCBVERS_4 (4u)
46
47enum {
48 RPCBPROC_NULL,
49 RPCBPROC_SET,
50 RPCBPROC_UNSET,
51 RPCBPROC_GETPORT,
52 RPCBPROC_GETADDR = 3, /* alias for GETPORT */
53 RPCBPROC_DUMP,
54 RPCBPROC_CALLIT,
55 RPCBPROC_BCAST = 5, /* alias for CALLIT */
56 RPCBPROC_GETTIME,
57 RPCBPROC_UADDR2TADDR,
58 RPCBPROC_TADDR2UADDR,
59 RPCBPROC_GETVERSADDR,
60 RPCBPROC_INDIRECT,
61 RPCBPROC_GETADDRLIST,
62 RPCBPROC_GETSTAT,
63};
64
65/*
66 * r_owner
67 *
68 * The "owner" is allowed to unset a service in the rpcbind database.
69 *
70 * For AF_LOCAL SET/UNSET requests, rpcbind treats this string as a
71 * UID which it maps to a local user name via a password lookup.
72 * In all other cases it is ignored.
73 *
74 * For SET/UNSET requests, user space provides a value, even for
75 * network requests, and GETADDR uses an empty string. We follow
76 * those precedents here.
77 */
78#define RPCB_OWNER_STRING "0"
79#define RPCB_MAXOWNERLEN sizeof(RPCB_OWNER_STRING)
80
81/*
82 * XDR data type sizes
83 */
84#define RPCB_program_sz (1)
85#define RPCB_version_sz (1)
86#define RPCB_protocol_sz (1)
87#define RPCB_port_sz (1)
88#define RPCB_boolean_sz (1)
89
90#define RPCB_netid_sz (1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN))
91#define RPCB_addr_sz (1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN))
92#define RPCB_ownerstring_sz (1 + XDR_QUADLEN(RPCB_MAXOWNERLEN))
93
94/*
95 * XDR argument and result sizes
96 */
97#define RPCB_mappingargs_sz (RPCB_program_sz + RPCB_version_sz + \
98 RPCB_protocol_sz + RPCB_port_sz)
99#define RPCB_getaddrargs_sz (RPCB_program_sz + RPCB_version_sz + \
100 RPCB_netid_sz + RPCB_addr_sz + \
101 RPCB_ownerstring_sz)
102
103#define RPCB_getportres_sz RPCB_port_sz
104#define RPCB_setres_sz RPCB_boolean_sz
105
106/*
107 * Note that RFC 1833 does not put any size restrictions on the
108 * address string returned by the remote rpcbind database.
109 */
110#define RPCB_getaddrres_sz RPCB_addr_sz
111
112static void rpcb_getport_done(struct rpc_task *, void *);
113static void rpcb_map_release(void *data);
114static const struct rpc_program rpcb_program;
115
116struct rpcbind_args {
117 struct rpc_xprt * r_xprt;
118
119 u32 r_prog;
120 u32 r_vers;
121 u32 r_prot;
122 unsigned short r_port;
123 const char * r_netid;
124 const char * r_addr;
125 const char * r_owner;
126
127 int r_status;
128};
129
130static const struct rpc_procinfo rpcb_procedures2[];
131static const struct rpc_procinfo rpcb_procedures3[];
132static const struct rpc_procinfo rpcb_procedures4[];
133
134struct rpcb_info {
135 u32 rpc_vers;
136 const struct rpc_procinfo *rpc_proc;
137};
138
139static const struct rpcb_info rpcb_next_version[];
140static const struct rpcb_info rpcb_next_version6[];
141
142static const struct rpc_call_ops rpcb_getport_ops = {
143 .rpc_call_done = rpcb_getport_done,
144 .rpc_release = rpcb_map_release,
145};
146
147static void rpcb_wake_rpcbind_waiters(struct rpc_xprt *xprt, int status)
148{
149 xprt_clear_binding(xprt);
150 rpc_wake_up_status(&xprt->binding, status);
151}
152
153static void rpcb_map_release(void *data)
154{
155 struct rpcbind_args *map = data;
156
157 rpcb_wake_rpcbind_waiters(map->r_xprt, map->r_status);
158 xprt_put(map->r_xprt);
159 kfree(map->r_addr);
160 kfree(map);
161}
162
163static int rpcb_get_local(struct net *net)
164{
165 int cnt;
166 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
167
168 spin_lock(&sn->rpcb_clnt_lock);
169 if (sn->rpcb_users)
170 sn->rpcb_users++;
171 cnt = sn->rpcb_users;
172 spin_unlock(&sn->rpcb_clnt_lock);
173
174 return cnt;
175}
176
177void rpcb_put_local(struct net *net)
178{
179 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
180 struct rpc_clnt *clnt = sn->rpcb_local_clnt;
181 struct rpc_clnt *clnt4 = sn->rpcb_local_clnt4;
182 int shutdown = 0;
183
184 spin_lock(&sn->rpcb_clnt_lock);
185 if (sn->rpcb_users) {
186 if (--sn->rpcb_users == 0) {
187 sn->rpcb_local_clnt = NULL;
188 sn->rpcb_local_clnt4 = NULL;
189 }
190 shutdown = !sn->rpcb_users;
191 }
192 spin_unlock(&sn->rpcb_clnt_lock);
193
194 if (shutdown) {
195 /*
196 * cleanup_rpcb_clnt - remove xprtsock's sysctls, unregister
197 */
198 if (clnt4)
199 rpc_shutdown_client(clnt4);
200 if (clnt)
201 rpc_shutdown_client(clnt);
202 }
203}
204
205static void rpcb_set_local(struct net *net, struct rpc_clnt *clnt,
206 struct rpc_clnt *clnt4,
207 bool is_af_local)
208{
209 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
210
211 /* Protected by rpcb_create_local_mutex */
212 sn->rpcb_local_clnt = clnt;
213 sn->rpcb_local_clnt4 = clnt4;
214 sn->rpcb_is_af_local = is_af_local ? 1 : 0;
215 smp_wmb();
216 sn->rpcb_users = 1;
217}
218
219/*
220 * Returns zero on success, otherwise a negative errno value
221 * is returned.
222 */
223static int rpcb_create_local_unix(struct net *net)
224{
225 static const struct sockaddr_un rpcb_localaddr_rpcbind = {
226 .sun_family = AF_LOCAL,
227 .sun_path = RPCBIND_SOCK_PATHNAME,
228 };
229 struct rpc_create_args args = {
230 .net = net,
231 .protocol = XPRT_TRANSPORT_LOCAL,
232 .address = (struct sockaddr *)&rpcb_localaddr_rpcbind,
233 .addrsize = sizeof(rpcb_localaddr_rpcbind),
234 .servername = "localhost",
235 .program = &rpcb_program,
236 .version = RPCBVERS_2,
237 .authflavor = RPC_AUTH_NULL,
238 .cred = current_cred(),
239 /*
240 * We turn off the idle timeout to prevent the kernel
241 * from automatically disconnecting the socket.
242 * Otherwise, we'd have to cache the mount namespace
243 * of the caller and somehow pass that to the socket
244 * reconnect code.
245 */
246 .flags = RPC_CLNT_CREATE_NO_IDLE_TIMEOUT,
247 };
248 struct rpc_clnt *clnt, *clnt4;
249 int result = 0;
250
251 /*
252 * Because we requested an RPC PING at transport creation time,
253 * this works only if the user space portmapper is rpcbind, and
254 * it's listening on AF_LOCAL on the named socket.
255 */
256 clnt = rpc_create(&args);
257 if (IS_ERR(clnt)) {
258 result = PTR_ERR(clnt);
259 goto out;
260 }
261
262 clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4);
263 if (IS_ERR(clnt4))
264 clnt4 = NULL;
265
266 rpcb_set_local(net, clnt, clnt4, true);
267
268out:
269 return result;
270}
271
272/*
273 * Returns zero on success, otherwise a negative errno value
274 * is returned.
275 */
276static int rpcb_create_local_net(struct net *net)
277{
278 static const struct sockaddr_in rpcb_inaddr_loopback = {
279 .sin_family = AF_INET,
280 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
281 .sin_port = htons(RPCBIND_PORT),
282 };
283 struct rpc_create_args args = {
284 .net = net,
285 .protocol = XPRT_TRANSPORT_TCP,
286 .address = (struct sockaddr *)&rpcb_inaddr_loopback,
287 .addrsize = sizeof(rpcb_inaddr_loopback),
288 .servername = "localhost",
289 .program = &rpcb_program,
290 .version = RPCBVERS_2,
291 .authflavor = RPC_AUTH_UNIX,
292 .cred = current_cred(),
293 .flags = RPC_CLNT_CREATE_NOPING,
294 };
295 struct rpc_clnt *clnt, *clnt4;
296 int result = 0;
297
298 clnt = rpc_create(&args);
299 if (IS_ERR(clnt)) {
300 result = PTR_ERR(clnt);
301 goto out;
302 }
303
304 /*
305 * This results in an RPC ping. On systems running portmapper,
306 * the v4 ping will fail. Proceed anyway, but disallow rpcb
307 * v4 upcalls.
308 */
309 clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4);
310 if (IS_ERR(clnt4))
311 clnt4 = NULL;
312
313 rpcb_set_local(net, clnt, clnt4, false);
314
315out:
316 return result;
317}
318
319/*
320 * Returns zero on success, otherwise a negative errno value
321 * is returned.
322 */
323int rpcb_create_local(struct net *net)
324{
325 static DEFINE_MUTEX(rpcb_create_local_mutex);
326 int result = 0;
327
328 if (rpcb_get_local(net))
329 return result;
330
331 mutex_lock(&rpcb_create_local_mutex);
332 if (rpcb_get_local(net))
333 goto out;
334
335 if (rpcb_create_local_unix(net) != 0)
336 result = rpcb_create_local_net(net);
337
338out:
339 mutex_unlock(&rpcb_create_local_mutex);
340 return result;
341}
342
343static struct rpc_clnt *rpcb_create(struct net *net, const char *nodename,
344 const char *hostname,
345 struct sockaddr *srvaddr, size_t salen,
346 int proto, u32 version,
347 const struct cred *cred,
348 const struct rpc_timeout *timeo)
349{
350 struct rpc_create_args args = {
351 .net = net,
352 .protocol = proto,
353 .address = srvaddr,
354 .addrsize = salen,
355 .timeout = timeo,
356 .servername = hostname,
357 .nodename = nodename,
358 .program = &rpcb_program,
359 .version = version,
360 .authflavor = RPC_AUTH_UNIX,
361 .cred = cred,
362 .flags = (RPC_CLNT_CREATE_NOPING |
363 RPC_CLNT_CREATE_NONPRIVPORT),
364 };
365
366 switch (srvaddr->sa_family) {
367 case AF_INET:
368 ((struct sockaddr_in *)srvaddr)->sin_port = htons(RPCBIND_PORT);
369 break;
370 case AF_INET6:
371 ((struct sockaddr_in6 *)srvaddr)->sin6_port = htons(RPCBIND_PORT);
372 break;
373 default:
374 return ERR_PTR(-EAFNOSUPPORT);
375 }
376
377 return rpc_create(&args);
378}
379
380static int rpcb_register_call(struct sunrpc_net *sn, struct rpc_clnt *clnt, struct rpc_message *msg, bool is_set)
381{
382 int flags = RPC_TASK_NOCONNECT;
383 int error, result = 0;
384
385 if (is_set || !sn->rpcb_is_af_local)
386 flags = RPC_TASK_SOFTCONN;
387 msg->rpc_resp = &result;
388
389 error = rpc_call_sync(clnt, msg, flags);
390 if (error < 0)
391 return error;
392
393 if (!result)
394 return -EACCES;
395 return 0;
396}
397
398/**
399 * rpcb_register - set or unset a port registration with the local rpcbind svc
400 * @net: target network namespace
401 * @prog: RPC program number to bind
402 * @vers: RPC version number to bind
403 * @prot: transport protocol to register
404 * @port: port value to register
405 *
406 * Returns zero if the registration request was dispatched successfully
407 * and the rpcbind daemon returned success. Otherwise, returns an errno
408 * value that reflects the nature of the error (request could not be
409 * dispatched, timed out, or rpcbind returned an error).
410 *
411 * RPC services invoke this function to advertise their contact
412 * information via the system's rpcbind daemon. RPC services
413 * invoke this function once for each [program, version, transport]
414 * tuple they wish to advertise.
415 *
416 * Callers may also unregister RPC services that are no longer
417 * available by setting the passed-in port to zero. This removes
418 * all registered transports for [program, version] from the local
419 * rpcbind database.
420 *
421 * This function uses rpcbind protocol version 2 to contact the
422 * local rpcbind daemon.
423 *
424 * Registration works over both AF_INET and AF_INET6, and services
425 * registered via this function are advertised as available for any
426 * address. If the local rpcbind daemon is listening on AF_INET6,
427 * services registered via this function will be advertised on
428 * IN6ADDR_ANY (ie available for all AF_INET and AF_INET6
429 * addresses).
430 */
431int rpcb_register(struct net *net, u32 prog, u32 vers, int prot, unsigned short port)
432{
433 struct rpcbind_args map = {
434 .r_prog = prog,
435 .r_vers = vers,
436 .r_prot = prot,
437 .r_port = port,
438 };
439 struct rpc_message msg = {
440 .rpc_argp = &map,
441 };
442 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
443 bool is_set = false;
444
445 trace_pmap_register(prog, vers, prot, port);
446
447 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_UNSET];
448 if (port != 0) {
449 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_SET];
450 is_set = true;
451 }
452
453 return rpcb_register_call(sn, sn->rpcb_local_clnt, &msg, is_set);
454}
455
456/*
457 * Fill in AF_INET family-specific arguments to register
458 */
459static int rpcb_register_inet4(struct sunrpc_net *sn,
460 const struct sockaddr *sap,
461 struct rpc_message *msg)
462{
463 const struct sockaddr_in *sin = (const struct sockaddr_in *)sap;
464 struct rpcbind_args *map = msg->rpc_argp;
465 unsigned short port = ntohs(sin->sin_port);
466 bool is_set = false;
467 int result;
468
469 map->r_addr = rpc_sockaddr2uaddr(sap, GFP_KERNEL);
470
471 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
472 if (port != 0) {
473 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
474 is_set = true;
475 }
476
477 result = rpcb_register_call(sn, sn->rpcb_local_clnt4, msg, is_set);
478 kfree(map->r_addr);
479 return result;
480}
481
482/*
483 * Fill in AF_INET6 family-specific arguments to register
484 */
485static int rpcb_register_inet6(struct sunrpc_net *sn,
486 const struct sockaddr *sap,
487 struct rpc_message *msg)
488{
489 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sap;
490 struct rpcbind_args *map = msg->rpc_argp;
491 unsigned short port = ntohs(sin6->sin6_port);
492 bool is_set = false;
493 int result;
494
495 map->r_addr = rpc_sockaddr2uaddr(sap, GFP_KERNEL);
496
497 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
498 if (port != 0) {
499 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
500 is_set = true;
501 }
502
503 result = rpcb_register_call(sn, sn->rpcb_local_clnt4, msg, is_set);
504 kfree(map->r_addr);
505 return result;
506}
507
508static int rpcb_unregister_all_protofamilies(struct sunrpc_net *sn,
509 struct rpc_message *msg)
510{
511 struct rpcbind_args *map = msg->rpc_argp;
512
513 trace_rpcb_unregister(map->r_prog, map->r_vers, map->r_netid);
514
515 map->r_addr = "";
516 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
517
518 return rpcb_register_call(sn, sn->rpcb_local_clnt4, msg, false);
519}
520
521/**
522 * rpcb_v4_register - set or unset a port registration with the local rpcbind
523 * @net: target network namespace
524 * @program: RPC program number of service to (un)register
525 * @version: RPC version number of service to (un)register
526 * @address: address family, IP address, and port to (un)register
527 * @netid: netid of transport protocol to (un)register
528 *
529 * Returns zero if the registration request was dispatched successfully
530 * and the rpcbind daemon returned success. Otherwise, returns an errno
531 * value that reflects the nature of the error (request could not be
532 * dispatched, timed out, or rpcbind returned an error).
533 *
534 * RPC services invoke this function to advertise their contact
535 * information via the system's rpcbind daemon. RPC services
536 * invoke this function once for each [program, version, address,
537 * netid] tuple they wish to advertise.
538 *
539 * Callers may also unregister RPC services that are registered at a
540 * specific address by setting the port number in @address to zero.
541 * They may unregister all registered protocol families at once for
542 * a service by passing a NULL @address argument. If @netid is ""
543 * then all netids for [program, version, address] are unregistered.
544 *
545 * This function uses rpcbind protocol version 4 to contact the
546 * local rpcbind daemon. The local rpcbind daemon must support
547 * version 4 of the rpcbind protocol in order for these functions
548 * to register a service successfully.
549 *
550 * Supported netids include "udp" and "tcp" for UDP and TCP over
551 * IPv4, and "udp6" and "tcp6" for UDP and TCP over IPv6,
552 * respectively.
553 *
554 * The contents of @address determine the address family and the
555 * port to be registered. The usual practice is to pass INADDR_ANY
556 * as the raw address, but specifying a non-zero address is also
557 * supported by this API if the caller wishes to advertise an RPC
558 * service on a specific network interface.
559 *
560 * Note that passing in INADDR_ANY does not create the same service
561 * registration as IN6ADDR_ANY. The former advertises an RPC
562 * service on any IPv4 address, but not on IPv6. The latter
563 * advertises the service on all IPv4 and IPv6 addresses.
564 */
565int rpcb_v4_register(struct net *net, const u32 program, const u32 version,
566 const struct sockaddr *address, const char *netid)
567{
568 struct rpcbind_args map = {
569 .r_prog = program,
570 .r_vers = version,
571 .r_netid = netid,
572 .r_owner = RPCB_OWNER_STRING,
573 };
574 struct rpc_message msg = {
575 .rpc_argp = &map,
576 };
577 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
578
579 if (sn->rpcb_local_clnt4 == NULL)
580 return -EPROTONOSUPPORT;
581
582 if (address == NULL)
583 return rpcb_unregister_all_protofamilies(sn, &msg);
584
585 trace_rpcb_register(map.r_prog, map.r_vers, map.r_addr, map.r_netid);
586
587 switch (address->sa_family) {
588 case AF_INET:
589 return rpcb_register_inet4(sn, address, &msg);
590 case AF_INET6:
591 return rpcb_register_inet6(sn, address, &msg);
592 }
593
594 return -EAFNOSUPPORT;
595}
596
597static struct rpc_task *rpcb_call_async(struct rpc_clnt *rpcb_clnt,
598 struct rpcbind_args *map, const struct rpc_procinfo *proc)
599{
600 struct rpc_message msg = {
601 .rpc_proc = proc,
602 .rpc_argp = map,
603 .rpc_resp = map,
604 };
605 struct rpc_task_setup task_setup_data = {
606 .rpc_client = rpcb_clnt,
607 .rpc_message = &msg,
608 .callback_ops = &rpcb_getport_ops,
609 .callback_data = map,
610 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFTCONN,
611 };
612
613 return rpc_run_task(&task_setup_data);
614}
615
616/*
617 * In the case where rpc clients have been cloned, we want to make
618 * sure that we use the program number/version etc of the actual
619 * owner of the xprt. To do so, we walk back up the tree of parents
620 * to find whoever created the transport and/or whoever has the
621 * autobind flag set.
622 */
623static struct rpc_clnt *rpcb_find_transport_owner(struct rpc_clnt *clnt)
624{
625 struct rpc_clnt *parent = clnt->cl_parent;
626 struct rpc_xprt_switch *xps = rcu_access_pointer(clnt->cl_xpi.xpi_xpswitch);
627
628 while (parent != clnt) {
629 if (rcu_access_pointer(parent->cl_xpi.xpi_xpswitch) != xps)
630 break;
631 if (clnt->cl_autobind)
632 break;
633 clnt = parent;
634 parent = parent->cl_parent;
635 }
636 return clnt;
637}
638
639/**
640 * rpcb_getport_async - obtain the port for a given RPC service on a given host
641 * @task: task that is waiting for portmapper request
642 *
643 * This one can be called for an ongoing RPC request, and can be used in
644 * an async (rpciod) context.
645 */
646void rpcb_getport_async(struct rpc_task *task)
647{
648 struct rpc_clnt *clnt;
649 const struct rpc_procinfo *proc;
650 u32 bind_version;
651 struct rpc_xprt *xprt;
652 struct rpc_clnt *rpcb_clnt;
653 struct rpcbind_args *map;
654 struct rpc_task *child;
655 struct sockaddr_storage addr;
656 struct sockaddr *sap = (struct sockaddr *)&addr;
657 size_t salen;
658 int status;
659
660 rcu_read_lock();
661 clnt = rpcb_find_transport_owner(task->tk_client);
662 rcu_read_unlock();
663 xprt = xprt_get(task->tk_xprt);
664
665 /* Put self on the wait queue to ensure we get notified if
666 * some other task is already attempting to bind the port */
667 rpc_sleep_on_timeout(&xprt->binding, task,
668 NULL, jiffies + xprt->bind_timeout);
669
670 if (xprt_test_and_set_binding(xprt)) {
671 xprt_put(xprt);
672 return;
673 }
674
675 /* Someone else may have bound if we slept */
676 if (xprt_bound(xprt)) {
677 status = 0;
678 goto bailout_nofree;
679 }
680
681 /* Parent transport's destination address */
682 salen = rpc_peeraddr(clnt, sap, sizeof(addr));
683
684 /* Don't ever use rpcbind v2 for AF_INET6 requests */
685 switch (sap->sa_family) {
686 case AF_INET:
687 proc = rpcb_next_version[xprt->bind_index].rpc_proc;
688 bind_version = rpcb_next_version[xprt->bind_index].rpc_vers;
689 break;
690 case AF_INET6:
691 proc = rpcb_next_version6[xprt->bind_index].rpc_proc;
692 bind_version = rpcb_next_version6[xprt->bind_index].rpc_vers;
693 break;
694 default:
695 status = -EAFNOSUPPORT;
696 goto bailout_nofree;
697 }
698 if (proc == NULL) {
699 xprt->bind_index = 0;
700 status = -EPFNOSUPPORT;
701 goto bailout_nofree;
702 }
703
704 trace_rpcb_getport(clnt, task, bind_version);
705
706 rpcb_clnt = rpcb_create(xprt->xprt_net,
707 clnt->cl_nodename,
708 xprt->servername, sap, salen,
709 xprt->prot, bind_version,
710 clnt->cl_cred,
711 task->tk_client->cl_timeout);
712 if (IS_ERR(rpcb_clnt)) {
713 status = PTR_ERR(rpcb_clnt);
714 goto bailout_nofree;
715 }
716
717 map = kzalloc(sizeof(struct rpcbind_args), rpc_task_gfp_mask());
718 if (!map) {
719 status = -ENOMEM;
720 goto bailout_release_client;
721 }
722 map->r_prog = clnt->cl_prog;
723 map->r_vers = clnt->cl_vers;
724 map->r_prot = xprt->prot;
725 map->r_port = 0;
726 map->r_xprt = xprt;
727 map->r_status = -EIO;
728
729 switch (bind_version) {
730 case RPCBVERS_4:
731 case RPCBVERS_3:
732 map->r_netid = xprt->address_strings[RPC_DISPLAY_NETID];
733 map->r_addr = rpc_sockaddr2uaddr(sap, rpc_task_gfp_mask());
734 if (!map->r_addr) {
735 status = -ENOMEM;
736 goto bailout_free_args;
737 }
738 map->r_owner = "";
739 break;
740 case RPCBVERS_2:
741 map->r_addr = NULL;
742 break;
743 default:
744 BUG();
745 }
746
747 child = rpcb_call_async(rpcb_clnt, map, proc);
748 rpc_release_client(rpcb_clnt);
749
750 xprt->stat.bind_count++;
751 rpc_put_task(child);
752 return;
753
754bailout_free_args:
755 kfree(map);
756bailout_release_client:
757 rpc_release_client(rpcb_clnt);
758bailout_nofree:
759 rpcb_wake_rpcbind_waiters(xprt, status);
760 task->tk_status = status;
761 xprt_put(xprt);
762}
763EXPORT_SYMBOL_GPL(rpcb_getport_async);
764
765/*
766 * Rpcbind child task calls this callback via tk_exit.
767 */
768static void rpcb_getport_done(struct rpc_task *child, void *data)
769{
770 struct rpcbind_args *map = data;
771 struct rpc_xprt *xprt = map->r_xprt;
772
773 map->r_status = child->tk_status;
774
775 /* Garbage reply: retry with a lesser rpcbind version */
776 if (map->r_status == -EIO)
777 map->r_status = -EPROTONOSUPPORT;
778
779 /* rpcbind server doesn't support this rpcbind protocol version */
780 if (map->r_status == -EPROTONOSUPPORT)
781 xprt->bind_index++;
782
783 if (map->r_status < 0) {
784 /* rpcbind server not available on remote host? */
785 map->r_port = 0;
786
787 } else if (map->r_port == 0) {
788 /* Requested RPC service wasn't registered on remote host */
789 map->r_status = -EACCES;
790 } else {
791 /* Succeeded */
792 map->r_status = 0;
793 }
794
795 trace_rpcb_setport(child, map->r_status, map->r_port);
796 xprt->ops->set_port(xprt, map->r_port);
797 if (map->r_port)
798 xprt_set_bound(xprt);
799}
800
801/*
802 * XDR functions for rpcbind
803 */
804
805static void rpcb_enc_mapping(struct rpc_rqst *req, struct xdr_stream *xdr,
806 const void *data)
807{
808 const struct rpcbind_args *rpcb = data;
809 __be32 *p;
810
811 p = xdr_reserve_space(xdr, RPCB_mappingargs_sz << 2);
812 *p++ = cpu_to_be32(rpcb->r_prog);
813 *p++ = cpu_to_be32(rpcb->r_vers);
814 *p++ = cpu_to_be32(rpcb->r_prot);
815 *p = cpu_to_be32(rpcb->r_port);
816}
817
818static int rpcb_dec_getport(struct rpc_rqst *req, struct xdr_stream *xdr,
819 void *data)
820{
821 struct rpcbind_args *rpcb = data;
822 unsigned long port;
823 __be32 *p;
824
825 rpcb->r_port = 0;
826
827 p = xdr_inline_decode(xdr, 4);
828 if (unlikely(p == NULL))
829 return -EIO;
830
831 port = be32_to_cpup(p);
832 if (unlikely(port > USHRT_MAX))
833 return -EIO;
834
835 rpcb->r_port = port;
836 return 0;
837}
838
839static int rpcb_dec_set(struct rpc_rqst *req, struct xdr_stream *xdr,
840 void *data)
841{
842 unsigned int *boolp = data;
843 __be32 *p;
844
845 p = xdr_inline_decode(xdr, 4);
846 if (unlikely(p == NULL))
847 return -EIO;
848
849 *boolp = 0;
850 if (*p != xdr_zero)
851 *boolp = 1;
852 return 0;
853}
854
855static void encode_rpcb_string(struct xdr_stream *xdr, const char *string,
856 const u32 maxstrlen)
857{
858 __be32 *p;
859 u32 len;
860
861 len = strlen(string);
862 WARN_ON_ONCE(len > maxstrlen);
863 if (len > maxstrlen)
864 /* truncate and hope for the best */
865 len = maxstrlen;
866 p = xdr_reserve_space(xdr, 4 + len);
867 xdr_encode_opaque(p, string, len);
868}
869
870static void rpcb_enc_getaddr(struct rpc_rqst *req, struct xdr_stream *xdr,
871 const void *data)
872{
873 const struct rpcbind_args *rpcb = data;
874 __be32 *p;
875
876 p = xdr_reserve_space(xdr, (RPCB_program_sz + RPCB_version_sz) << 2);
877 *p++ = cpu_to_be32(rpcb->r_prog);
878 *p = cpu_to_be32(rpcb->r_vers);
879
880 encode_rpcb_string(xdr, rpcb->r_netid, RPCBIND_MAXNETIDLEN);
881 encode_rpcb_string(xdr, rpcb->r_addr, RPCBIND_MAXUADDRLEN);
882 encode_rpcb_string(xdr, rpcb->r_owner, RPCB_MAXOWNERLEN);
883}
884
885static int rpcb_dec_getaddr(struct rpc_rqst *req, struct xdr_stream *xdr,
886 void *data)
887{
888 struct rpcbind_args *rpcb = data;
889 struct sockaddr_storage address;
890 struct sockaddr *sap = (struct sockaddr *)&address;
891 __be32 *p;
892 u32 len;
893
894 rpcb->r_port = 0;
895
896 p = xdr_inline_decode(xdr, 4);
897 if (unlikely(p == NULL))
898 goto out_fail;
899 len = be32_to_cpup(p);
900
901 /*
902 * If the returned universal address is a null string,
903 * the requested RPC service was not registered.
904 */
905 if (len == 0)
906 return 0;
907
908 if (unlikely(len > RPCBIND_MAXUADDRLEN))
909 goto out_fail;
910
911 p = xdr_inline_decode(xdr, len);
912 if (unlikely(p == NULL))
913 goto out_fail;
914
915 if (rpc_uaddr2sockaddr(req->rq_xprt->xprt_net, (char *)p, len,
916 sap, sizeof(address)) == 0)
917 goto out_fail;
918 rpcb->r_port = rpc_get_port(sap);
919
920 return 0;
921
922out_fail:
923 return -EIO;
924}
925
926/*
927 * Not all rpcbind procedures described in RFC 1833 are implemented
928 * since the Linux kernel RPC code requires only these.
929 */
930
931static const struct rpc_procinfo rpcb_procedures2[] = {
932 [RPCBPROC_SET] = {
933 .p_proc = RPCBPROC_SET,
934 .p_encode = rpcb_enc_mapping,
935 .p_decode = rpcb_dec_set,
936 .p_arglen = RPCB_mappingargs_sz,
937 .p_replen = RPCB_setres_sz,
938 .p_statidx = RPCBPROC_SET,
939 .p_timer = 0,
940 .p_name = "SET",
941 },
942 [RPCBPROC_UNSET] = {
943 .p_proc = RPCBPROC_UNSET,
944 .p_encode = rpcb_enc_mapping,
945 .p_decode = rpcb_dec_set,
946 .p_arglen = RPCB_mappingargs_sz,
947 .p_replen = RPCB_setres_sz,
948 .p_statidx = RPCBPROC_UNSET,
949 .p_timer = 0,
950 .p_name = "UNSET",
951 },
952 [RPCBPROC_GETPORT] = {
953 .p_proc = RPCBPROC_GETPORT,
954 .p_encode = rpcb_enc_mapping,
955 .p_decode = rpcb_dec_getport,
956 .p_arglen = RPCB_mappingargs_sz,
957 .p_replen = RPCB_getportres_sz,
958 .p_statidx = RPCBPROC_GETPORT,
959 .p_timer = 0,
960 .p_name = "GETPORT",
961 },
962};
963
964static const struct rpc_procinfo rpcb_procedures3[] = {
965 [RPCBPROC_SET] = {
966 .p_proc = RPCBPROC_SET,
967 .p_encode = rpcb_enc_getaddr,
968 .p_decode = rpcb_dec_set,
969 .p_arglen = RPCB_getaddrargs_sz,
970 .p_replen = RPCB_setres_sz,
971 .p_statidx = RPCBPROC_SET,
972 .p_timer = 0,
973 .p_name = "SET",
974 },
975 [RPCBPROC_UNSET] = {
976 .p_proc = RPCBPROC_UNSET,
977 .p_encode = rpcb_enc_getaddr,
978 .p_decode = rpcb_dec_set,
979 .p_arglen = RPCB_getaddrargs_sz,
980 .p_replen = RPCB_setres_sz,
981 .p_statidx = RPCBPROC_UNSET,
982 .p_timer = 0,
983 .p_name = "UNSET",
984 },
985 [RPCBPROC_GETADDR] = {
986 .p_proc = RPCBPROC_GETADDR,
987 .p_encode = rpcb_enc_getaddr,
988 .p_decode = rpcb_dec_getaddr,
989 .p_arglen = RPCB_getaddrargs_sz,
990 .p_replen = RPCB_getaddrres_sz,
991 .p_statidx = RPCBPROC_GETADDR,
992 .p_timer = 0,
993 .p_name = "GETADDR",
994 },
995};
996
997static const struct rpc_procinfo rpcb_procedures4[] = {
998 [RPCBPROC_SET] = {
999 .p_proc = RPCBPROC_SET,
1000 .p_encode = rpcb_enc_getaddr,
1001 .p_decode = rpcb_dec_set,
1002 .p_arglen = RPCB_getaddrargs_sz,
1003 .p_replen = RPCB_setres_sz,
1004 .p_statidx = RPCBPROC_SET,
1005 .p_timer = 0,
1006 .p_name = "SET",
1007 },
1008 [RPCBPROC_UNSET] = {
1009 .p_proc = RPCBPROC_UNSET,
1010 .p_encode = rpcb_enc_getaddr,
1011 .p_decode = rpcb_dec_set,
1012 .p_arglen = RPCB_getaddrargs_sz,
1013 .p_replen = RPCB_setres_sz,
1014 .p_statidx = RPCBPROC_UNSET,
1015 .p_timer = 0,
1016 .p_name = "UNSET",
1017 },
1018 [RPCBPROC_GETADDR] = {
1019 .p_proc = RPCBPROC_GETADDR,
1020 .p_encode = rpcb_enc_getaddr,
1021 .p_decode = rpcb_dec_getaddr,
1022 .p_arglen = RPCB_getaddrargs_sz,
1023 .p_replen = RPCB_getaddrres_sz,
1024 .p_statidx = RPCBPROC_GETADDR,
1025 .p_timer = 0,
1026 .p_name = "GETADDR",
1027 },
1028};
1029
1030static const struct rpcb_info rpcb_next_version[] = {
1031 {
1032 .rpc_vers = RPCBVERS_2,
1033 .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT],
1034 },
1035 {
1036 .rpc_proc = NULL,
1037 },
1038};
1039
1040static const struct rpcb_info rpcb_next_version6[] = {
1041 {
1042 .rpc_vers = RPCBVERS_4,
1043 .rpc_proc = &rpcb_procedures4[RPCBPROC_GETADDR],
1044 },
1045 {
1046 .rpc_vers = RPCBVERS_3,
1047 .rpc_proc = &rpcb_procedures3[RPCBPROC_GETADDR],
1048 },
1049 {
1050 .rpc_proc = NULL,
1051 },
1052};
1053
1054static unsigned int rpcb_version2_counts[ARRAY_SIZE(rpcb_procedures2)];
1055static const struct rpc_version rpcb_version2 = {
1056 .number = RPCBVERS_2,
1057 .nrprocs = ARRAY_SIZE(rpcb_procedures2),
1058 .procs = rpcb_procedures2,
1059 .counts = rpcb_version2_counts,
1060};
1061
1062static unsigned int rpcb_version3_counts[ARRAY_SIZE(rpcb_procedures3)];
1063static const struct rpc_version rpcb_version3 = {
1064 .number = RPCBVERS_3,
1065 .nrprocs = ARRAY_SIZE(rpcb_procedures3),
1066 .procs = rpcb_procedures3,
1067 .counts = rpcb_version3_counts,
1068};
1069
1070static unsigned int rpcb_version4_counts[ARRAY_SIZE(rpcb_procedures4)];
1071static const struct rpc_version rpcb_version4 = {
1072 .number = RPCBVERS_4,
1073 .nrprocs = ARRAY_SIZE(rpcb_procedures4),
1074 .procs = rpcb_procedures4,
1075 .counts = rpcb_version4_counts,
1076};
1077
1078static const struct rpc_version *rpcb_version[] = {
1079 NULL,
1080 NULL,
1081 &rpcb_version2,
1082 &rpcb_version3,
1083 &rpcb_version4
1084};
1085
1086static struct rpc_stat rpcb_stats;
1087
1088static const struct rpc_program rpcb_program = {
1089 .name = "rpcbind",
1090 .number = RPCBIND_PROGRAM,
1091 .nrvers = ARRAY_SIZE(rpcb_version),
1092 .version = rpcb_version,
1093 .stats = &rpcb_stats,
1094};
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * In-kernel rpcbind client supporting versions 2, 3, and 4 of the rpcbind
4 * protocol
5 *
6 * Based on RFC 1833: "Binding Protocols for ONC RPC Version 2" and
7 * RFC 3530: "Network File System (NFS) version 4 Protocol"
8 *
9 * Original: Gilles Quillard, Bull Open Source, 2005 <gilles.quillard@bull.net>
10 * Updated: Chuck Lever, Oracle Corporation, 2007 <chuck.lever@oracle.com>
11 *
12 * Descended from net/sunrpc/pmap_clnt.c,
13 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
14 */
15
16#include <linux/module.h>
17
18#include <linux/types.h>
19#include <linux/socket.h>
20#include <linux/un.h>
21#include <linux/in.h>
22#include <linux/in6.h>
23#include <linux/kernel.h>
24#include <linux/errno.h>
25#include <linux/mutex.h>
26#include <linux/slab.h>
27#include <net/ipv6.h>
28
29#include <linux/sunrpc/clnt.h>
30#include <linux/sunrpc/addr.h>
31#include <linux/sunrpc/sched.h>
32#include <linux/sunrpc/xprtsock.h>
33
34#include <trace/events/sunrpc.h>
35
36#include "netns.h"
37
38#define RPCBIND_SOCK_PATHNAME "/var/run/rpcbind.sock"
39#define RPCBIND_SOCK_ABSTRACT_NAME "\0/run/rpcbind.sock"
40
41#define RPCBIND_PROGRAM (100000u)
42#define RPCBIND_PORT (111u)
43
44#define RPCBVERS_2 (2u)
45#define RPCBVERS_3 (3u)
46#define RPCBVERS_4 (4u)
47
48enum {
49 RPCBPROC_NULL,
50 RPCBPROC_SET,
51 RPCBPROC_UNSET,
52 RPCBPROC_GETPORT,
53 RPCBPROC_GETADDR = 3, /* alias for GETPORT */
54 RPCBPROC_DUMP,
55 RPCBPROC_CALLIT,
56 RPCBPROC_BCAST = 5, /* alias for CALLIT */
57 RPCBPROC_GETTIME,
58 RPCBPROC_UADDR2TADDR,
59 RPCBPROC_TADDR2UADDR,
60 RPCBPROC_GETVERSADDR,
61 RPCBPROC_INDIRECT,
62 RPCBPROC_GETADDRLIST,
63 RPCBPROC_GETSTAT,
64};
65
66/*
67 * r_owner
68 *
69 * The "owner" is allowed to unset a service in the rpcbind database.
70 *
71 * For AF_LOCAL SET/UNSET requests, rpcbind treats this string as a
72 * UID which it maps to a local user name via a password lookup.
73 * In all other cases it is ignored.
74 *
75 * For SET/UNSET requests, user space provides a value, even for
76 * network requests, and GETADDR uses an empty string. We follow
77 * those precedents here.
78 */
79#define RPCB_OWNER_STRING "0"
80#define RPCB_MAXOWNERLEN sizeof(RPCB_OWNER_STRING)
81
82/*
83 * XDR data type sizes
84 */
85#define RPCB_program_sz (1)
86#define RPCB_version_sz (1)
87#define RPCB_protocol_sz (1)
88#define RPCB_port_sz (1)
89#define RPCB_boolean_sz (1)
90
91#define RPCB_netid_sz (1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN))
92#define RPCB_addr_sz (1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN))
93#define RPCB_ownerstring_sz (1 + XDR_QUADLEN(RPCB_MAXOWNERLEN))
94
95/*
96 * XDR argument and result sizes
97 */
98#define RPCB_mappingargs_sz (RPCB_program_sz + RPCB_version_sz + \
99 RPCB_protocol_sz + RPCB_port_sz)
100#define RPCB_getaddrargs_sz (RPCB_program_sz + RPCB_version_sz + \
101 RPCB_netid_sz + RPCB_addr_sz + \
102 RPCB_ownerstring_sz)
103
104#define RPCB_getportres_sz RPCB_port_sz
105#define RPCB_setres_sz RPCB_boolean_sz
106
107/*
108 * Note that RFC 1833 does not put any size restrictions on the
109 * address string returned by the remote rpcbind database.
110 */
111#define RPCB_getaddrres_sz RPCB_addr_sz
112
113static void rpcb_getport_done(struct rpc_task *, void *);
114static void rpcb_map_release(void *data);
115static const struct rpc_program rpcb_program;
116
117struct rpcbind_args {
118 struct rpc_xprt * r_xprt;
119
120 u32 r_prog;
121 u32 r_vers;
122 u32 r_prot;
123 unsigned short r_port;
124 const char * r_netid;
125 const char * r_addr;
126 const char * r_owner;
127
128 int r_status;
129};
130
131static const struct rpc_procinfo rpcb_procedures2[];
132static const struct rpc_procinfo rpcb_procedures3[];
133static const struct rpc_procinfo rpcb_procedures4[];
134
135struct rpcb_info {
136 u32 rpc_vers;
137 const struct rpc_procinfo *rpc_proc;
138};
139
140static const struct rpcb_info rpcb_next_version[];
141static const struct rpcb_info rpcb_next_version6[];
142
143static const struct rpc_call_ops rpcb_getport_ops = {
144 .rpc_call_done = rpcb_getport_done,
145 .rpc_release = rpcb_map_release,
146};
147
148static void rpcb_wake_rpcbind_waiters(struct rpc_xprt *xprt, int status)
149{
150 xprt_clear_binding(xprt);
151 rpc_wake_up_status(&xprt->binding, status);
152}
153
154static void rpcb_map_release(void *data)
155{
156 struct rpcbind_args *map = data;
157
158 rpcb_wake_rpcbind_waiters(map->r_xprt, map->r_status);
159 xprt_put(map->r_xprt);
160 kfree(map->r_addr);
161 kfree(map);
162}
163
164static int rpcb_get_local(struct net *net)
165{
166 int cnt;
167 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
168
169 spin_lock(&sn->rpcb_clnt_lock);
170 if (sn->rpcb_users)
171 sn->rpcb_users++;
172 cnt = sn->rpcb_users;
173 spin_unlock(&sn->rpcb_clnt_lock);
174
175 return cnt;
176}
177
178void rpcb_put_local(struct net *net)
179{
180 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
181 struct rpc_clnt *clnt = sn->rpcb_local_clnt;
182 struct rpc_clnt *clnt4 = sn->rpcb_local_clnt4;
183 int shutdown = 0;
184
185 spin_lock(&sn->rpcb_clnt_lock);
186 if (sn->rpcb_users) {
187 if (--sn->rpcb_users == 0) {
188 sn->rpcb_local_clnt = NULL;
189 sn->rpcb_local_clnt4 = NULL;
190 }
191 shutdown = !sn->rpcb_users;
192 }
193 spin_unlock(&sn->rpcb_clnt_lock);
194
195 if (shutdown) {
196 /*
197 * cleanup_rpcb_clnt - remove xprtsock's sysctls, unregister
198 */
199 if (clnt4)
200 rpc_shutdown_client(clnt4);
201 if (clnt)
202 rpc_shutdown_client(clnt);
203 }
204}
205
206static void rpcb_set_local(struct net *net, struct rpc_clnt *clnt,
207 struct rpc_clnt *clnt4,
208 bool is_af_local)
209{
210 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
211
212 /* Protected by rpcb_create_local_mutex */
213 sn->rpcb_local_clnt = clnt;
214 sn->rpcb_local_clnt4 = clnt4;
215 sn->rpcb_is_af_local = is_af_local ? 1 : 0;
216 smp_wmb();
217 sn->rpcb_users = 1;
218}
219
220/* Evaluate to actual length of the `sockaddr_un' structure. */
221# define SUN_LEN(ptr) (offsetof(struct sockaddr_un, sun_path) \
222 + 1 + strlen((ptr)->sun_path + 1))
223
224/*
225 * Returns zero on success, otherwise a negative errno value
226 * is returned.
227 */
228static int rpcb_create_af_local(struct net *net,
229 const struct sockaddr_un *addr)
230{
231 struct rpc_create_args args = {
232 .net = net,
233 .protocol = XPRT_TRANSPORT_LOCAL,
234 .address = (struct sockaddr *)addr,
235 .addrsize = SUN_LEN(addr),
236 .servername = "localhost",
237 .program = &rpcb_program,
238 .version = RPCBVERS_2,
239 .authflavor = RPC_AUTH_NULL,
240 .cred = current_cred(),
241 /*
242 * We turn off the idle timeout to prevent the kernel
243 * from automatically disconnecting the socket.
244 * Otherwise, we'd have to cache the mount namespace
245 * of the caller and somehow pass that to the socket
246 * reconnect code.
247 */
248 .flags = RPC_CLNT_CREATE_NO_IDLE_TIMEOUT,
249 };
250 struct rpc_clnt *clnt, *clnt4;
251 int result = 0;
252
253 /*
254 * Because we requested an RPC PING at transport creation time,
255 * this works only if the user space portmapper is rpcbind, and
256 * it's listening on AF_LOCAL on the named socket.
257 */
258 clnt = rpc_create(&args);
259 if (IS_ERR(clnt)) {
260 result = PTR_ERR(clnt);
261 goto out;
262 }
263
264 clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4);
265 if (IS_ERR(clnt4))
266 clnt4 = NULL;
267
268 rpcb_set_local(net, clnt, clnt4, true);
269
270out:
271 return result;
272}
273
274static int rpcb_create_local_abstract(struct net *net)
275{
276 static const struct sockaddr_un rpcb_localaddr_abstract = {
277 .sun_family = AF_LOCAL,
278 .sun_path = RPCBIND_SOCK_ABSTRACT_NAME,
279 };
280
281 return rpcb_create_af_local(net, &rpcb_localaddr_abstract);
282}
283
284static int rpcb_create_local_unix(struct net *net)
285{
286 static const struct sockaddr_un rpcb_localaddr_unix = {
287 .sun_family = AF_LOCAL,
288 .sun_path = RPCBIND_SOCK_PATHNAME,
289 };
290
291 return rpcb_create_af_local(net, &rpcb_localaddr_unix);
292}
293
294/*
295 * Returns zero on success, otherwise a negative errno value
296 * is returned.
297 */
298static int rpcb_create_local_net(struct net *net)
299{
300 static const struct sockaddr_in rpcb_inaddr_loopback = {
301 .sin_family = AF_INET,
302 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
303 .sin_port = htons(RPCBIND_PORT),
304 };
305 struct rpc_create_args args = {
306 .net = net,
307 .protocol = XPRT_TRANSPORT_TCP,
308 .address = (struct sockaddr *)&rpcb_inaddr_loopback,
309 .addrsize = sizeof(rpcb_inaddr_loopback),
310 .servername = "localhost",
311 .program = &rpcb_program,
312 .version = RPCBVERS_2,
313 .authflavor = RPC_AUTH_UNIX,
314 .cred = current_cred(),
315 .flags = RPC_CLNT_CREATE_NOPING,
316 };
317 struct rpc_clnt *clnt, *clnt4;
318 int result = 0;
319
320 clnt = rpc_create(&args);
321 if (IS_ERR(clnt)) {
322 result = PTR_ERR(clnt);
323 goto out;
324 }
325
326 /*
327 * This results in an RPC ping. On systems running portmapper,
328 * the v4 ping will fail. Proceed anyway, but disallow rpcb
329 * v4 upcalls.
330 */
331 clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4);
332 if (IS_ERR(clnt4))
333 clnt4 = NULL;
334
335 rpcb_set_local(net, clnt, clnt4, false);
336
337out:
338 return result;
339}
340
341/*
342 * Returns zero on success, otherwise a negative errno value
343 * is returned.
344 */
345int rpcb_create_local(struct net *net)
346{
347 static DEFINE_MUTEX(rpcb_create_local_mutex);
348 int result = 0;
349
350 if (rpcb_get_local(net))
351 return result;
352
353 mutex_lock(&rpcb_create_local_mutex);
354 if (rpcb_get_local(net))
355 goto out;
356
357 if (rpcb_create_local_abstract(net) != 0 &&
358 rpcb_create_local_unix(net) != 0)
359 result = rpcb_create_local_net(net);
360
361out:
362 mutex_unlock(&rpcb_create_local_mutex);
363 return result;
364}
365
366static struct rpc_clnt *rpcb_create(struct net *net, const char *nodename,
367 const char *hostname,
368 struct sockaddr *srvaddr, size_t salen,
369 int proto, u32 version,
370 const struct cred *cred,
371 const struct rpc_timeout *timeo)
372{
373 struct rpc_create_args args = {
374 .net = net,
375 .protocol = proto,
376 .address = srvaddr,
377 .addrsize = salen,
378 .timeout = timeo,
379 .servername = hostname,
380 .nodename = nodename,
381 .program = &rpcb_program,
382 .version = version,
383 .authflavor = RPC_AUTH_UNIX,
384 .cred = cred,
385 .flags = (RPC_CLNT_CREATE_NOPING |
386 RPC_CLNT_CREATE_NONPRIVPORT),
387 };
388
389 switch (srvaddr->sa_family) {
390 case AF_INET:
391 ((struct sockaddr_in *)srvaddr)->sin_port = htons(RPCBIND_PORT);
392 break;
393 case AF_INET6:
394 ((struct sockaddr_in6 *)srvaddr)->sin6_port = htons(RPCBIND_PORT);
395 break;
396 default:
397 return ERR_PTR(-EAFNOSUPPORT);
398 }
399
400 return rpc_create(&args);
401}
402
403static int rpcb_register_call(struct sunrpc_net *sn, struct rpc_clnt *clnt, struct rpc_message *msg, bool is_set)
404{
405 int flags = RPC_TASK_NOCONNECT;
406 int error, result = 0;
407
408 if (is_set || !sn->rpcb_is_af_local)
409 flags = RPC_TASK_SOFTCONN;
410 msg->rpc_resp = &result;
411
412 error = rpc_call_sync(clnt, msg, flags);
413 if (error < 0)
414 return error;
415
416 if (!result)
417 return -EACCES;
418 return 0;
419}
420
421/**
422 * rpcb_register - set or unset a port registration with the local rpcbind svc
423 * @net: target network namespace
424 * @prog: RPC program number to bind
425 * @vers: RPC version number to bind
426 * @prot: transport protocol to register
427 * @port: port value to register
428 *
429 * Returns zero if the registration request was dispatched successfully
430 * and the rpcbind daemon returned success. Otherwise, returns an errno
431 * value that reflects the nature of the error (request could not be
432 * dispatched, timed out, or rpcbind returned an error).
433 *
434 * RPC services invoke this function to advertise their contact
435 * information via the system's rpcbind daemon. RPC services
436 * invoke this function once for each [program, version, transport]
437 * tuple they wish to advertise.
438 *
439 * Callers may also unregister RPC services that are no longer
440 * available by setting the passed-in port to zero. This removes
441 * all registered transports for [program, version] from the local
442 * rpcbind database.
443 *
444 * This function uses rpcbind protocol version 2 to contact the
445 * local rpcbind daemon.
446 *
447 * Registration works over both AF_INET and AF_INET6, and services
448 * registered via this function are advertised as available for any
449 * address. If the local rpcbind daemon is listening on AF_INET6,
450 * services registered via this function will be advertised on
451 * IN6ADDR_ANY (ie available for all AF_INET and AF_INET6
452 * addresses).
453 */
454int rpcb_register(struct net *net, u32 prog, u32 vers, int prot, unsigned short port)
455{
456 struct rpcbind_args map = {
457 .r_prog = prog,
458 .r_vers = vers,
459 .r_prot = prot,
460 .r_port = port,
461 };
462 struct rpc_message msg = {
463 .rpc_argp = &map,
464 };
465 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
466 bool is_set = false;
467
468 trace_pmap_register(prog, vers, prot, port);
469
470 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_UNSET];
471 if (port != 0) {
472 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_SET];
473 is_set = true;
474 }
475
476 return rpcb_register_call(sn, sn->rpcb_local_clnt, &msg, is_set);
477}
478
479/*
480 * Fill in AF_INET family-specific arguments to register
481 */
482static int rpcb_register_inet4(struct sunrpc_net *sn,
483 const struct sockaddr *sap,
484 struct rpc_message *msg)
485{
486 const struct sockaddr_in *sin = (const struct sockaddr_in *)sap;
487 struct rpcbind_args *map = msg->rpc_argp;
488 unsigned short port = ntohs(sin->sin_port);
489 bool is_set = false;
490 int result;
491
492 map->r_addr = rpc_sockaddr2uaddr(sap, GFP_KERNEL);
493
494 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
495 if (port != 0) {
496 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
497 is_set = true;
498 }
499
500 result = rpcb_register_call(sn, sn->rpcb_local_clnt4, msg, is_set);
501 kfree(map->r_addr);
502 return result;
503}
504
505/*
506 * Fill in AF_INET6 family-specific arguments to register
507 */
508static int rpcb_register_inet6(struct sunrpc_net *sn,
509 const struct sockaddr *sap,
510 struct rpc_message *msg)
511{
512 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sap;
513 struct rpcbind_args *map = msg->rpc_argp;
514 unsigned short port = ntohs(sin6->sin6_port);
515 bool is_set = false;
516 int result;
517
518 map->r_addr = rpc_sockaddr2uaddr(sap, GFP_KERNEL);
519
520 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
521 if (port != 0) {
522 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
523 is_set = true;
524 }
525
526 result = rpcb_register_call(sn, sn->rpcb_local_clnt4, msg, is_set);
527 kfree(map->r_addr);
528 return result;
529}
530
531static int rpcb_unregister_all_protofamilies(struct sunrpc_net *sn,
532 struct rpc_message *msg)
533{
534 struct rpcbind_args *map = msg->rpc_argp;
535
536 trace_rpcb_unregister(map->r_prog, map->r_vers, map->r_netid);
537
538 map->r_addr = "";
539 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
540
541 return rpcb_register_call(sn, sn->rpcb_local_clnt4, msg, false);
542}
543
544/**
545 * rpcb_v4_register - set or unset a port registration with the local rpcbind
546 * @net: target network namespace
547 * @program: RPC program number of service to (un)register
548 * @version: RPC version number of service to (un)register
549 * @address: address family, IP address, and port to (un)register
550 * @netid: netid of transport protocol to (un)register
551 *
552 * Returns zero if the registration request was dispatched successfully
553 * and the rpcbind daemon returned success. Otherwise, returns an errno
554 * value that reflects the nature of the error (request could not be
555 * dispatched, timed out, or rpcbind returned an error).
556 *
557 * RPC services invoke this function to advertise their contact
558 * information via the system's rpcbind daemon. RPC services
559 * invoke this function once for each [program, version, address,
560 * netid] tuple they wish to advertise.
561 *
562 * Callers may also unregister RPC services that are registered at a
563 * specific address by setting the port number in @address to zero.
564 * They may unregister all registered protocol families at once for
565 * a service by passing a NULL @address argument. If @netid is ""
566 * then all netids for [program, version, address] are unregistered.
567 *
568 * This function uses rpcbind protocol version 4 to contact the
569 * local rpcbind daemon. The local rpcbind daemon must support
570 * version 4 of the rpcbind protocol in order for these functions
571 * to register a service successfully.
572 *
573 * Supported netids include "udp" and "tcp" for UDP and TCP over
574 * IPv4, and "udp6" and "tcp6" for UDP and TCP over IPv6,
575 * respectively.
576 *
577 * The contents of @address determine the address family and the
578 * port to be registered. The usual practice is to pass INADDR_ANY
579 * as the raw address, but specifying a non-zero address is also
580 * supported by this API if the caller wishes to advertise an RPC
581 * service on a specific network interface.
582 *
583 * Note that passing in INADDR_ANY does not create the same service
584 * registration as IN6ADDR_ANY. The former advertises an RPC
585 * service on any IPv4 address, but not on IPv6. The latter
586 * advertises the service on all IPv4 and IPv6 addresses.
587 */
588int rpcb_v4_register(struct net *net, const u32 program, const u32 version,
589 const struct sockaddr *address, const char *netid)
590{
591 struct rpcbind_args map = {
592 .r_prog = program,
593 .r_vers = version,
594 .r_netid = netid,
595 .r_owner = RPCB_OWNER_STRING,
596 };
597 struct rpc_message msg = {
598 .rpc_argp = &map,
599 };
600 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
601
602 if (sn->rpcb_local_clnt4 == NULL)
603 return -EPROTONOSUPPORT;
604
605 if (address == NULL)
606 return rpcb_unregister_all_protofamilies(sn, &msg);
607
608 trace_rpcb_register(map.r_prog, map.r_vers, map.r_addr, map.r_netid);
609
610 switch (address->sa_family) {
611 case AF_INET:
612 return rpcb_register_inet4(sn, address, &msg);
613 case AF_INET6:
614 return rpcb_register_inet6(sn, address, &msg);
615 }
616
617 return -EAFNOSUPPORT;
618}
619
620static struct rpc_task *rpcb_call_async(struct rpc_clnt *rpcb_clnt,
621 struct rpcbind_args *map, const struct rpc_procinfo *proc)
622{
623 struct rpc_message msg = {
624 .rpc_proc = proc,
625 .rpc_argp = map,
626 .rpc_resp = map,
627 };
628 struct rpc_task_setup task_setup_data = {
629 .rpc_client = rpcb_clnt,
630 .rpc_message = &msg,
631 .callback_ops = &rpcb_getport_ops,
632 .callback_data = map,
633 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFTCONN,
634 };
635
636 return rpc_run_task(&task_setup_data);
637}
638
639/*
640 * In the case where rpc clients have been cloned, we want to make
641 * sure that we use the program number/version etc of the actual
642 * owner of the xprt. To do so, we walk back up the tree of parents
643 * to find whoever created the transport and/or whoever has the
644 * autobind flag set.
645 */
646static struct rpc_clnt *rpcb_find_transport_owner(struct rpc_clnt *clnt)
647{
648 struct rpc_clnt *parent = clnt->cl_parent;
649 struct rpc_xprt_switch *xps = rcu_access_pointer(clnt->cl_xpi.xpi_xpswitch);
650
651 while (parent != clnt) {
652 if (rcu_access_pointer(parent->cl_xpi.xpi_xpswitch) != xps)
653 break;
654 if (clnt->cl_autobind)
655 break;
656 clnt = parent;
657 parent = parent->cl_parent;
658 }
659 return clnt;
660}
661
662/**
663 * rpcb_getport_async - obtain the port for a given RPC service on a given host
664 * @task: task that is waiting for portmapper request
665 *
666 * This one can be called for an ongoing RPC request, and can be used in
667 * an async (rpciod) context.
668 */
669void rpcb_getport_async(struct rpc_task *task)
670{
671 struct rpc_clnt *clnt;
672 const struct rpc_procinfo *proc;
673 u32 bind_version;
674 struct rpc_xprt *xprt;
675 struct rpc_clnt *rpcb_clnt;
676 struct rpcbind_args *map;
677 struct rpc_task *child;
678 struct sockaddr_storage addr;
679 struct sockaddr *sap = (struct sockaddr *)&addr;
680 size_t salen;
681 int status;
682
683 rcu_read_lock();
684 clnt = rpcb_find_transport_owner(task->tk_client);
685 rcu_read_unlock();
686 xprt = xprt_get(task->tk_xprt);
687
688 /* Put self on the wait queue to ensure we get notified if
689 * some other task is already attempting to bind the port */
690 rpc_sleep_on_timeout(&xprt->binding, task,
691 NULL, jiffies + xprt->bind_timeout);
692
693 if (xprt_test_and_set_binding(xprt)) {
694 xprt_put(xprt);
695 return;
696 }
697
698 /* Someone else may have bound if we slept */
699 if (xprt_bound(xprt)) {
700 status = 0;
701 goto bailout_nofree;
702 }
703
704 /* Parent transport's destination address */
705 salen = rpc_peeraddr(clnt, sap, sizeof(addr));
706
707 /* Don't ever use rpcbind v2 for AF_INET6 requests */
708 switch (sap->sa_family) {
709 case AF_INET:
710 proc = rpcb_next_version[xprt->bind_index].rpc_proc;
711 bind_version = rpcb_next_version[xprt->bind_index].rpc_vers;
712 break;
713 case AF_INET6:
714 proc = rpcb_next_version6[xprt->bind_index].rpc_proc;
715 bind_version = rpcb_next_version6[xprt->bind_index].rpc_vers;
716 break;
717 default:
718 status = -EAFNOSUPPORT;
719 goto bailout_nofree;
720 }
721 if (proc == NULL) {
722 xprt->bind_index = 0;
723 status = -EPFNOSUPPORT;
724 goto bailout_nofree;
725 }
726
727 trace_rpcb_getport(clnt, task, bind_version);
728
729 rpcb_clnt = rpcb_create(xprt->xprt_net,
730 clnt->cl_nodename,
731 xprt->servername, sap, salen,
732 xprt->prot, bind_version,
733 clnt->cl_cred,
734 task->tk_client->cl_timeout);
735 if (IS_ERR(rpcb_clnt)) {
736 status = PTR_ERR(rpcb_clnt);
737 goto bailout_nofree;
738 }
739
740 map = kzalloc(sizeof(struct rpcbind_args), rpc_task_gfp_mask());
741 if (!map) {
742 status = -ENOMEM;
743 goto bailout_release_client;
744 }
745 map->r_prog = clnt->cl_prog;
746 map->r_vers = clnt->cl_vers;
747 map->r_prot = xprt->prot;
748 map->r_port = 0;
749 map->r_xprt = xprt;
750 map->r_status = -EIO;
751
752 switch (bind_version) {
753 case RPCBVERS_4:
754 case RPCBVERS_3:
755 map->r_netid = xprt->address_strings[RPC_DISPLAY_NETID];
756 map->r_addr = rpc_sockaddr2uaddr(sap, rpc_task_gfp_mask());
757 if (!map->r_addr) {
758 status = -ENOMEM;
759 goto bailout_free_args;
760 }
761 map->r_owner = "";
762 break;
763 case RPCBVERS_2:
764 map->r_addr = NULL;
765 break;
766 default:
767 BUG();
768 }
769
770 child = rpcb_call_async(rpcb_clnt, map, proc);
771 rpc_release_client(rpcb_clnt);
772 if (IS_ERR(child)) {
773 /* rpcb_map_release() has freed the arguments */
774 return;
775 }
776
777 xprt->stat.bind_count++;
778 rpc_put_task(child);
779 return;
780
781bailout_free_args:
782 kfree(map);
783bailout_release_client:
784 rpc_release_client(rpcb_clnt);
785bailout_nofree:
786 rpcb_wake_rpcbind_waiters(xprt, status);
787 task->tk_status = status;
788 xprt_put(xprt);
789}
790EXPORT_SYMBOL_GPL(rpcb_getport_async);
791
792/*
793 * Rpcbind child task calls this callback via tk_exit.
794 */
795static void rpcb_getport_done(struct rpc_task *child, void *data)
796{
797 struct rpcbind_args *map = data;
798 struct rpc_xprt *xprt = map->r_xprt;
799
800 map->r_status = child->tk_status;
801
802 /* Garbage reply: retry with a lesser rpcbind version */
803 if (map->r_status == -EIO)
804 map->r_status = -EPROTONOSUPPORT;
805
806 /* rpcbind server doesn't support this rpcbind protocol version */
807 if (map->r_status == -EPROTONOSUPPORT)
808 xprt->bind_index++;
809
810 if (map->r_status < 0) {
811 /* rpcbind server not available on remote host? */
812 map->r_port = 0;
813
814 } else if (map->r_port == 0) {
815 /* Requested RPC service wasn't registered on remote host */
816 map->r_status = -EACCES;
817 } else {
818 /* Succeeded */
819 map->r_status = 0;
820 }
821
822 trace_rpcb_setport(child, map->r_status, map->r_port);
823 xprt->ops->set_port(xprt, map->r_port);
824 if (map->r_port)
825 xprt_set_bound(xprt);
826}
827
828/*
829 * XDR functions for rpcbind
830 */
831
832static void rpcb_enc_mapping(struct rpc_rqst *req, struct xdr_stream *xdr,
833 const void *data)
834{
835 const struct rpcbind_args *rpcb = data;
836 __be32 *p;
837
838 p = xdr_reserve_space(xdr, RPCB_mappingargs_sz << 2);
839 *p++ = cpu_to_be32(rpcb->r_prog);
840 *p++ = cpu_to_be32(rpcb->r_vers);
841 *p++ = cpu_to_be32(rpcb->r_prot);
842 *p = cpu_to_be32(rpcb->r_port);
843}
844
845static int rpcb_dec_getport(struct rpc_rqst *req, struct xdr_stream *xdr,
846 void *data)
847{
848 struct rpcbind_args *rpcb = data;
849 unsigned long port;
850 __be32 *p;
851
852 rpcb->r_port = 0;
853
854 p = xdr_inline_decode(xdr, 4);
855 if (unlikely(p == NULL))
856 return -EIO;
857
858 port = be32_to_cpup(p);
859 if (unlikely(port > USHRT_MAX))
860 return -EIO;
861
862 rpcb->r_port = port;
863 return 0;
864}
865
866static int rpcb_dec_set(struct rpc_rqst *req, struct xdr_stream *xdr,
867 void *data)
868{
869 unsigned int *boolp = data;
870 __be32 *p;
871
872 p = xdr_inline_decode(xdr, 4);
873 if (unlikely(p == NULL))
874 return -EIO;
875
876 *boolp = 0;
877 if (*p != xdr_zero)
878 *boolp = 1;
879 return 0;
880}
881
882static void encode_rpcb_string(struct xdr_stream *xdr, const char *string,
883 const u32 maxstrlen)
884{
885 __be32 *p;
886 u32 len;
887
888 len = strlen(string);
889 WARN_ON_ONCE(len > maxstrlen);
890 if (len > maxstrlen)
891 /* truncate and hope for the best */
892 len = maxstrlen;
893 p = xdr_reserve_space(xdr, 4 + len);
894 xdr_encode_opaque(p, string, len);
895}
896
897static void rpcb_enc_getaddr(struct rpc_rqst *req, struct xdr_stream *xdr,
898 const void *data)
899{
900 const struct rpcbind_args *rpcb = data;
901 __be32 *p;
902
903 p = xdr_reserve_space(xdr, (RPCB_program_sz + RPCB_version_sz) << 2);
904 *p++ = cpu_to_be32(rpcb->r_prog);
905 *p = cpu_to_be32(rpcb->r_vers);
906
907 encode_rpcb_string(xdr, rpcb->r_netid, RPCBIND_MAXNETIDLEN);
908 encode_rpcb_string(xdr, rpcb->r_addr, RPCBIND_MAXUADDRLEN);
909 encode_rpcb_string(xdr, rpcb->r_owner, RPCB_MAXOWNERLEN);
910}
911
912static int rpcb_dec_getaddr(struct rpc_rqst *req, struct xdr_stream *xdr,
913 void *data)
914{
915 struct rpcbind_args *rpcb = data;
916 struct sockaddr_storage address;
917 struct sockaddr *sap = (struct sockaddr *)&address;
918 __be32 *p;
919 u32 len;
920
921 rpcb->r_port = 0;
922
923 p = xdr_inline_decode(xdr, 4);
924 if (unlikely(p == NULL))
925 goto out_fail;
926 len = be32_to_cpup(p);
927
928 /*
929 * If the returned universal address is a null string,
930 * the requested RPC service was not registered.
931 */
932 if (len == 0)
933 return 0;
934
935 if (unlikely(len > RPCBIND_MAXUADDRLEN))
936 goto out_fail;
937
938 p = xdr_inline_decode(xdr, len);
939 if (unlikely(p == NULL))
940 goto out_fail;
941
942 if (rpc_uaddr2sockaddr(req->rq_xprt->xprt_net, (char *)p, len,
943 sap, sizeof(address)) == 0)
944 goto out_fail;
945 rpcb->r_port = rpc_get_port(sap);
946
947 return 0;
948
949out_fail:
950 return -EIO;
951}
952
953/*
954 * Not all rpcbind procedures described in RFC 1833 are implemented
955 * since the Linux kernel RPC code requires only these.
956 */
957
958static const struct rpc_procinfo rpcb_procedures2[] = {
959 [RPCBPROC_SET] = {
960 .p_proc = RPCBPROC_SET,
961 .p_encode = rpcb_enc_mapping,
962 .p_decode = rpcb_dec_set,
963 .p_arglen = RPCB_mappingargs_sz,
964 .p_replen = RPCB_setres_sz,
965 .p_statidx = RPCBPROC_SET,
966 .p_timer = 0,
967 .p_name = "SET",
968 },
969 [RPCBPROC_UNSET] = {
970 .p_proc = RPCBPROC_UNSET,
971 .p_encode = rpcb_enc_mapping,
972 .p_decode = rpcb_dec_set,
973 .p_arglen = RPCB_mappingargs_sz,
974 .p_replen = RPCB_setres_sz,
975 .p_statidx = RPCBPROC_UNSET,
976 .p_timer = 0,
977 .p_name = "UNSET",
978 },
979 [RPCBPROC_GETPORT] = {
980 .p_proc = RPCBPROC_GETPORT,
981 .p_encode = rpcb_enc_mapping,
982 .p_decode = rpcb_dec_getport,
983 .p_arglen = RPCB_mappingargs_sz,
984 .p_replen = RPCB_getportres_sz,
985 .p_statidx = RPCBPROC_GETPORT,
986 .p_timer = 0,
987 .p_name = "GETPORT",
988 },
989};
990
991static const struct rpc_procinfo rpcb_procedures3[] = {
992 [RPCBPROC_SET] = {
993 .p_proc = RPCBPROC_SET,
994 .p_encode = rpcb_enc_getaddr,
995 .p_decode = rpcb_dec_set,
996 .p_arglen = RPCB_getaddrargs_sz,
997 .p_replen = RPCB_setres_sz,
998 .p_statidx = RPCBPROC_SET,
999 .p_timer = 0,
1000 .p_name = "SET",
1001 },
1002 [RPCBPROC_UNSET] = {
1003 .p_proc = RPCBPROC_UNSET,
1004 .p_encode = rpcb_enc_getaddr,
1005 .p_decode = rpcb_dec_set,
1006 .p_arglen = RPCB_getaddrargs_sz,
1007 .p_replen = RPCB_setres_sz,
1008 .p_statidx = RPCBPROC_UNSET,
1009 .p_timer = 0,
1010 .p_name = "UNSET",
1011 },
1012 [RPCBPROC_GETADDR] = {
1013 .p_proc = RPCBPROC_GETADDR,
1014 .p_encode = rpcb_enc_getaddr,
1015 .p_decode = rpcb_dec_getaddr,
1016 .p_arglen = RPCB_getaddrargs_sz,
1017 .p_replen = RPCB_getaddrres_sz,
1018 .p_statidx = RPCBPROC_GETADDR,
1019 .p_timer = 0,
1020 .p_name = "GETADDR",
1021 },
1022};
1023
1024static const struct rpc_procinfo rpcb_procedures4[] = {
1025 [RPCBPROC_SET] = {
1026 .p_proc = RPCBPROC_SET,
1027 .p_encode = rpcb_enc_getaddr,
1028 .p_decode = rpcb_dec_set,
1029 .p_arglen = RPCB_getaddrargs_sz,
1030 .p_replen = RPCB_setres_sz,
1031 .p_statidx = RPCBPROC_SET,
1032 .p_timer = 0,
1033 .p_name = "SET",
1034 },
1035 [RPCBPROC_UNSET] = {
1036 .p_proc = RPCBPROC_UNSET,
1037 .p_encode = rpcb_enc_getaddr,
1038 .p_decode = rpcb_dec_set,
1039 .p_arglen = RPCB_getaddrargs_sz,
1040 .p_replen = RPCB_setres_sz,
1041 .p_statidx = RPCBPROC_UNSET,
1042 .p_timer = 0,
1043 .p_name = "UNSET",
1044 },
1045 [RPCBPROC_GETADDR] = {
1046 .p_proc = RPCBPROC_GETADDR,
1047 .p_encode = rpcb_enc_getaddr,
1048 .p_decode = rpcb_dec_getaddr,
1049 .p_arglen = RPCB_getaddrargs_sz,
1050 .p_replen = RPCB_getaddrres_sz,
1051 .p_statidx = RPCBPROC_GETADDR,
1052 .p_timer = 0,
1053 .p_name = "GETADDR",
1054 },
1055};
1056
1057static const struct rpcb_info rpcb_next_version[] = {
1058 {
1059 .rpc_vers = RPCBVERS_2,
1060 .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT],
1061 },
1062 {
1063 .rpc_proc = NULL,
1064 },
1065};
1066
1067static const struct rpcb_info rpcb_next_version6[] = {
1068 {
1069 .rpc_vers = RPCBVERS_4,
1070 .rpc_proc = &rpcb_procedures4[RPCBPROC_GETADDR],
1071 },
1072 {
1073 .rpc_vers = RPCBVERS_3,
1074 .rpc_proc = &rpcb_procedures3[RPCBPROC_GETADDR],
1075 },
1076 {
1077 .rpc_proc = NULL,
1078 },
1079};
1080
1081static unsigned int rpcb_version2_counts[ARRAY_SIZE(rpcb_procedures2)];
1082static const struct rpc_version rpcb_version2 = {
1083 .number = RPCBVERS_2,
1084 .nrprocs = ARRAY_SIZE(rpcb_procedures2),
1085 .procs = rpcb_procedures2,
1086 .counts = rpcb_version2_counts,
1087};
1088
1089static unsigned int rpcb_version3_counts[ARRAY_SIZE(rpcb_procedures3)];
1090static const struct rpc_version rpcb_version3 = {
1091 .number = RPCBVERS_3,
1092 .nrprocs = ARRAY_SIZE(rpcb_procedures3),
1093 .procs = rpcb_procedures3,
1094 .counts = rpcb_version3_counts,
1095};
1096
1097static unsigned int rpcb_version4_counts[ARRAY_SIZE(rpcb_procedures4)];
1098static const struct rpc_version rpcb_version4 = {
1099 .number = RPCBVERS_4,
1100 .nrprocs = ARRAY_SIZE(rpcb_procedures4),
1101 .procs = rpcb_procedures4,
1102 .counts = rpcb_version4_counts,
1103};
1104
1105static const struct rpc_version *rpcb_version[] = {
1106 NULL,
1107 NULL,
1108 &rpcb_version2,
1109 &rpcb_version3,
1110 &rpcb_version4
1111};
1112
1113static struct rpc_stat rpcb_stats;
1114
1115static const struct rpc_program rpcb_program = {
1116 .name = "rpcbind",
1117 .number = RPCBIND_PROGRAM,
1118 .nrvers = ARRAY_SIZE(rpcb_version),
1119 .version = rpcb_version,
1120 .stats = &rpcb_stats,
1121};