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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#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};
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 "netns.h"
35
36#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
37# define RPCDBG_FACILITY RPCDBG_BIND
38#endif
39
40#define RPCBIND_SOCK_PATHNAME "/var/run/rpcbind.sock"
41
42#define RPCBIND_PROGRAM (100000u)
43#define RPCBIND_PORT (111u)
44
45#define RPCBVERS_2 (2u)
46#define RPCBVERS_3 (3u)
47#define RPCBVERS_4 (4u)
48
49enum {
50 RPCBPROC_NULL,
51 RPCBPROC_SET,
52 RPCBPROC_UNSET,
53 RPCBPROC_GETPORT,
54 RPCBPROC_GETADDR = 3, /* alias for GETPORT */
55 RPCBPROC_DUMP,
56 RPCBPROC_CALLIT,
57 RPCBPROC_BCAST = 5, /* alias for CALLIT */
58 RPCBPROC_GETTIME,
59 RPCBPROC_UADDR2TADDR,
60 RPCBPROC_TADDR2UADDR,
61 RPCBPROC_GETVERSADDR,
62 RPCBPROC_INDIRECT,
63 RPCBPROC_GETADDRLIST,
64 RPCBPROC_GETSTAT,
65};
66
67/*
68 * r_owner
69 *
70 * The "owner" is allowed to unset a service in the rpcbind database.
71 *
72 * For AF_LOCAL SET/UNSET requests, rpcbind treats this string as a
73 * UID which it maps to a local user name via a password lookup.
74 * In all other cases it is ignored.
75 *
76 * For SET/UNSET requests, user space provides a value, even for
77 * network requests, and GETADDR uses an empty string. We follow
78 * those precedents here.
79 */
80#define RPCB_OWNER_STRING "0"
81#define RPCB_MAXOWNERLEN sizeof(RPCB_OWNER_STRING)
82
83/*
84 * XDR data type sizes
85 */
86#define RPCB_program_sz (1)
87#define RPCB_version_sz (1)
88#define RPCB_protocol_sz (1)
89#define RPCB_port_sz (1)
90#define RPCB_boolean_sz (1)
91
92#define RPCB_netid_sz (1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN))
93#define RPCB_addr_sz (1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN))
94#define RPCB_ownerstring_sz (1 + XDR_QUADLEN(RPCB_MAXOWNERLEN))
95
96/*
97 * XDR argument and result sizes
98 */
99#define RPCB_mappingargs_sz (RPCB_program_sz + RPCB_version_sz + \
100 RPCB_protocol_sz + RPCB_port_sz)
101#define RPCB_getaddrargs_sz (RPCB_program_sz + RPCB_version_sz + \
102 RPCB_netid_sz + RPCB_addr_sz + \
103 RPCB_ownerstring_sz)
104
105#define RPCB_getportres_sz RPCB_port_sz
106#define RPCB_setres_sz RPCB_boolean_sz
107
108/*
109 * Note that RFC 1833 does not put any size restrictions on the
110 * address string returned by the remote rpcbind database.
111 */
112#define RPCB_getaddrres_sz RPCB_addr_sz
113
114static void rpcb_getport_done(struct rpc_task *, void *);
115static void rpcb_map_release(void *data);
116static const struct rpc_program rpcb_program;
117
118struct rpcbind_args {
119 struct rpc_xprt * r_xprt;
120
121 u32 r_prog;
122 u32 r_vers;
123 u32 r_prot;
124 unsigned short r_port;
125 const char * r_netid;
126 const char * r_addr;
127 const char * r_owner;
128
129 int r_status;
130};
131
132static const struct rpc_procinfo rpcb_procedures2[];
133static const struct rpc_procinfo rpcb_procedures3[];
134static const struct rpc_procinfo rpcb_procedures4[];
135
136struct rpcb_info {
137 u32 rpc_vers;
138 const struct rpc_procinfo *rpc_proc;
139};
140
141static const struct rpcb_info rpcb_next_version[];
142static const struct rpcb_info rpcb_next_version6[];
143
144static const struct rpc_call_ops rpcb_getport_ops = {
145 .rpc_call_done = rpcb_getport_done,
146 .rpc_release = rpcb_map_release,
147};
148
149static void rpcb_wake_rpcbind_waiters(struct rpc_xprt *xprt, int status)
150{
151 xprt_clear_binding(xprt);
152 rpc_wake_up_status(&xprt->binding, status);
153}
154
155static void rpcb_map_release(void *data)
156{
157 struct rpcbind_args *map = data;
158
159 rpcb_wake_rpcbind_waiters(map->r_xprt, map->r_status);
160 xprt_put(map->r_xprt);
161 kfree(map->r_addr);
162 kfree(map);
163}
164
165static int rpcb_get_local(struct net *net)
166{
167 int cnt;
168 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
169
170 spin_lock(&sn->rpcb_clnt_lock);
171 if (sn->rpcb_users)
172 sn->rpcb_users++;
173 cnt = sn->rpcb_users;
174 spin_unlock(&sn->rpcb_clnt_lock);
175
176 return cnt;
177}
178
179void rpcb_put_local(struct net *net)
180{
181 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
182 struct rpc_clnt *clnt = sn->rpcb_local_clnt;
183 struct rpc_clnt *clnt4 = sn->rpcb_local_clnt4;
184 int shutdown = 0;
185
186 spin_lock(&sn->rpcb_clnt_lock);
187 if (sn->rpcb_users) {
188 if (--sn->rpcb_users == 0) {
189 sn->rpcb_local_clnt = NULL;
190 sn->rpcb_local_clnt4 = NULL;
191 }
192 shutdown = !sn->rpcb_users;
193 }
194 spin_unlock(&sn->rpcb_clnt_lock);
195
196 if (shutdown) {
197 /*
198 * cleanup_rpcb_clnt - remove xprtsock's sysctls, unregister
199 */
200 if (clnt4)
201 rpc_shutdown_client(clnt4);
202 if (clnt)
203 rpc_shutdown_client(clnt);
204 }
205}
206
207static void rpcb_set_local(struct net *net, struct rpc_clnt *clnt,
208 struct rpc_clnt *clnt4,
209 bool is_af_local)
210{
211 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
212
213 /* Protected by rpcb_create_local_mutex */
214 sn->rpcb_local_clnt = clnt;
215 sn->rpcb_local_clnt4 = clnt4;
216 sn->rpcb_is_af_local = is_af_local ? 1 : 0;
217 smp_wmb();
218 sn->rpcb_users = 1;
219 dprintk("RPC: created new rpcb local clients (rpcb_local_clnt: "
220 "%p, rpcb_local_clnt4: %p) for net %x%s\n",
221 sn->rpcb_local_clnt, sn->rpcb_local_clnt4,
222 net->ns.inum, (net == &init_net) ? " (init_net)" : "");
223}
224
225/*
226 * Returns zero on success, otherwise a negative errno value
227 * is returned.
228 */
229static int rpcb_create_local_unix(struct net *net)
230{
231 static const struct sockaddr_un rpcb_localaddr_rpcbind = {
232 .sun_family = AF_LOCAL,
233 .sun_path = RPCBIND_SOCK_PATHNAME,
234 };
235 struct rpc_create_args args = {
236 .net = net,
237 .protocol = XPRT_TRANSPORT_LOCAL,
238 .address = (struct sockaddr *)&rpcb_localaddr_rpcbind,
239 .addrsize = sizeof(rpcb_localaddr_rpcbind),
240 .servername = "localhost",
241 .program = &rpcb_program,
242 .version = RPCBVERS_2,
243 .authflavor = RPC_AUTH_NULL,
244 .cred = current_cred(),
245 /*
246 * We turn off the idle timeout to prevent the kernel
247 * from automatically disconnecting the socket.
248 * Otherwise, we'd have to cache the mount namespace
249 * of the caller and somehow pass that to the socket
250 * reconnect code.
251 */
252 .flags = RPC_CLNT_CREATE_NO_IDLE_TIMEOUT,
253 };
254 struct rpc_clnt *clnt, *clnt4;
255 int result = 0;
256
257 /*
258 * Because we requested an RPC PING at transport creation time,
259 * this works only if the user space portmapper is rpcbind, and
260 * it's listening on AF_LOCAL on the named socket.
261 */
262 clnt = rpc_create(&args);
263 if (IS_ERR(clnt)) {
264 dprintk("RPC: failed to create AF_LOCAL rpcbind "
265 "client (errno %ld).\n", PTR_ERR(clnt));
266 result = PTR_ERR(clnt);
267 goto out;
268 }
269
270 clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4);
271 if (IS_ERR(clnt4)) {
272 dprintk("RPC: failed to bind second program to "
273 "rpcbind v4 client (errno %ld).\n",
274 PTR_ERR(clnt4));
275 clnt4 = NULL;
276 }
277
278 rpcb_set_local(net, clnt, clnt4, true);
279
280out:
281 return result;
282}
283
284/*
285 * Returns zero on success, otherwise a negative errno value
286 * is returned.
287 */
288static int rpcb_create_local_net(struct net *net)
289{
290 static const struct sockaddr_in rpcb_inaddr_loopback = {
291 .sin_family = AF_INET,
292 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
293 .sin_port = htons(RPCBIND_PORT),
294 };
295 struct rpc_create_args args = {
296 .net = net,
297 .protocol = XPRT_TRANSPORT_TCP,
298 .address = (struct sockaddr *)&rpcb_inaddr_loopback,
299 .addrsize = sizeof(rpcb_inaddr_loopback),
300 .servername = "localhost",
301 .program = &rpcb_program,
302 .version = RPCBVERS_2,
303 .authflavor = RPC_AUTH_UNIX,
304 .cred = current_cred(),
305 .flags = RPC_CLNT_CREATE_NOPING,
306 };
307 struct rpc_clnt *clnt, *clnt4;
308 int result = 0;
309
310 clnt = rpc_create(&args);
311 if (IS_ERR(clnt)) {
312 dprintk("RPC: failed to create local rpcbind "
313 "client (errno %ld).\n", PTR_ERR(clnt));
314 result = PTR_ERR(clnt);
315 goto out;
316 }
317
318 /*
319 * This results in an RPC ping. On systems running portmapper,
320 * the v4 ping will fail. Proceed anyway, but disallow rpcb
321 * v4 upcalls.
322 */
323 clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4);
324 if (IS_ERR(clnt4)) {
325 dprintk("RPC: failed to bind second program to "
326 "rpcbind v4 client (errno %ld).\n",
327 PTR_ERR(clnt4));
328 clnt4 = NULL;
329 }
330
331 rpcb_set_local(net, clnt, clnt4, false);
332
333out:
334 return result;
335}
336
337/*
338 * Returns zero on success, otherwise a negative errno value
339 * is returned.
340 */
341int rpcb_create_local(struct net *net)
342{
343 static DEFINE_MUTEX(rpcb_create_local_mutex);
344 int result = 0;
345
346 if (rpcb_get_local(net))
347 return result;
348
349 mutex_lock(&rpcb_create_local_mutex);
350 if (rpcb_get_local(net))
351 goto out;
352
353 if (rpcb_create_local_unix(net) != 0)
354 result = rpcb_create_local_net(net);
355
356out:
357 mutex_unlock(&rpcb_create_local_mutex);
358 return result;
359}
360
361static struct rpc_clnt *rpcb_create(struct net *net, const char *nodename,
362 const char *hostname,
363 struct sockaddr *srvaddr, size_t salen,
364 int proto, u32 version,
365 const struct cred *cred)
366{
367 struct rpc_create_args args = {
368 .net = net,
369 .protocol = proto,
370 .address = srvaddr,
371 .addrsize = salen,
372 .servername = hostname,
373 .nodename = nodename,
374 .program = &rpcb_program,
375 .version = version,
376 .authflavor = RPC_AUTH_UNIX,
377 .cred = cred,
378 .flags = (RPC_CLNT_CREATE_NOPING |
379 RPC_CLNT_CREATE_NONPRIVPORT),
380 };
381
382 switch (srvaddr->sa_family) {
383 case AF_INET:
384 ((struct sockaddr_in *)srvaddr)->sin_port = htons(RPCBIND_PORT);
385 break;
386 case AF_INET6:
387 ((struct sockaddr_in6 *)srvaddr)->sin6_port = htons(RPCBIND_PORT);
388 break;
389 default:
390 return ERR_PTR(-EAFNOSUPPORT);
391 }
392
393 return rpc_create(&args);
394}
395
396static int rpcb_register_call(struct sunrpc_net *sn, struct rpc_clnt *clnt, struct rpc_message *msg, bool is_set)
397{
398 int flags = RPC_TASK_NOCONNECT;
399 int error, result = 0;
400
401 if (is_set || !sn->rpcb_is_af_local)
402 flags = RPC_TASK_SOFTCONN;
403 msg->rpc_resp = &result;
404
405 error = rpc_call_sync(clnt, msg, flags);
406 if (error < 0) {
407 dprintk("RPC: failed to contact local rpcbind "
408 "server (errno %d).\n", -error);
409 return error;
410 }
411
412 if (!result)
413 return -EACCES;
414 return 0;
415}
416
417/**
418 * rpcb_register - set or unset a port registration with the local rpcbind svc
419 * @net: target network namespace
420 * @prog: RPC program number to bind
421 * @vers: RPC version number to bind
422 * @prot: transport protocol to register
423 * @port: port value to register
424 *
425 * Returns zero if the registration request was dispatched successfully
426 * and the rpcbind daemon returned success. Otherwise, returns an errno
427 * value that reflects the nature of the error (request could not be
428 * dispatched, timed out, or rpcbind returned an error).
429 *
430 * RPC services invoke this function to advertise their contact
431 * information via the system's rpcbind daemon. RPC services
432 * invoke this function once for each [program, version, transport]
433 * tuple they wish to advertise.
434 *
435 * Callers may also unregister RPC services that are no longer
436 * available by setting the passed-in port to zero. This removes
437 * all registered transports for [program, version] from the local
438 * rpcbind database.
439 *
440 * This function uses rpcbind protocol version 2 to contact the
441 * local rpcbind daemon.
442 *
443 * Registration works over both AF_INET and AF_INET6, and services
444 * registered via this function are advertised as available for any
445 * address. If the local rpcbind daemon is listening on AF_INET6,
446 * services registered via this function will be advertised on
447 * IN6ADDR_ANY (ie available for all AF_INET and AF_INET6
448 * addresses).
449 */
450int rpcb_register(struct net *net, u32 prog, u32 vers, int prot, unsigned short port)
451{
452 struct rpcbind_args map = {
453 .r_prog = prog,
454 .r_vers = vers,
455 .r_prot = prot,
456 .r_port = port,
457 };
458 struct rpc_message msg = {
459 .rpc_argp = &map,
460 };
461 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
462 bool is_set = false;
463
464 dprintk("RPC: %sregistering (%u, %u, %d, %u) with local "
465 "rpcbind\n", (port ? "" : "un"),
466 prog, vers, prot, port);
467
468 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_UNSET];
469 if (port != 0) {
470 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_SET];
471 is_set = true;
472 }
473
474 return rpcb_register_call(sn, sn->rpcb_local_clnt, &msg, is_set);
475}
476
477/*
478 * Fill in AF_INET family-specific arguments to register
479 */
480static int rpcb_register_inet4(struct sunrpc_net *sn,
481 const struct sockaddr *sap,
482 struct rpc_message *msg)
483{
484 const struct sockaddr_in *sin = (const struct sockaddr_in *)sap;
485 struct rpcbind_args *map = msg->rpc_argp;
486 unsigned short port = ntohs(sin->sin_port);
487 bool is_set = false;
488 int result;
489
490 map->r_addr = rpc_sockaddr2uaddr(sap, GFP_KERNEL);
491
492 dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with "
493 "local rpcbind\n", (port ? "" : "un"),
494 map->r_prog, map->r_vers,
495 map->r_addr, map->r_netid);
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
508/*
509 * Fill in AF_INET6 family-specific arguments to register
510 */
511static int rpcb_register_inet6(struct sunrpc_net *sn,
512 const struct sockaddr *sap,
513 struct rpc_message *msg)
514{
515 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sap;
516 struct rpcbind_args *map = msg->rpc_argp;
517 unsigned short port = ntohs(sin6->sin6_port);
518 bool is_set = false;
519 int result;
520
521 map->r_addr = rpc_sockaddr2uaddr(sap, GFP_KERNEL);
522
523 dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with "
524 "local rpcbind\n", (port ? "" : "un"),
525 map->r_prog, map->r_vers,
526 map->r_addr, map->r_netid);
527
528 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
529 if (port != 0) {
530 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
531 is_set = true;
532 }
533
534 result = rpcb_register_call(sn, sn->rpcb_local_clnt4, msg, is_set);
535 kfree(map->r_addr);
536 return result;
537}
538
539static int rpcb_unregister_all_protofamilies(struct sunrpc_net *sn,
540 struct rpc_message *msg)
541{
542 struct rpcbind_args *map = msg->rpc_argp;
543
544 dprintk("RPC: unregistering [%u, %u, '%s'] with "
545 "local rpcbind\n",
546 map->r_prog, map->r_vers, map->r_netid);
547
548 map->r_addr = "";
549 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
550
551 return rpcb_register_call(sn, sn->rpcb_local_clnt4, msg, false);
552}
553
554/**
555 * rpcb_v4_register - set or unset a port registration with the local rpcbind
556 * @net: target network namespace
557 * @program: RPC program number of service to (un)register
558 * @version: RPC version number of service to (un)register
559 * @address: address family, IP address, and port to (un)register
560 * @netid: netid of transport protocol to (un)register
561 *
562 * Returns zero if the registration request was dispatched successfully
563 * and the rpcbind daemon returned success. Otherwise, returns an errno
564 * value that reflects the nature of the error (request could not be
565 * dispatched, timed out, or rpcbind returned an error).
566 *
567 * RPC services invoke this function to advertise their contact
568 * information via the system's rpcbind daemon. RPC services
569 * invoke this function once for each [program, version, address,
570 * netid] tuple they wish to advertise.
571 *
572 * Callers may also unregister RPC services that are registered at a
573 * specific address by setting the port number in @address to zero.
574 * They may unregister all registered protocol families at once for
575 * a service by passing a NULL @address argument. If @netid is ""
576 * then all netids for [program, version, address] are unregistered.
577 *
578 * This function uses rpcbind protocol version 4 to contact the
579 * local rpcbind daemon. The local rpcbind daemon must support
580 * version 4 of the rpcbind protocol in order for these functions
581 * to register a service successfully.
582 *
583 * Supported netids include "udp" and "tcp" for UDP and TCP over
584 * IPv4, and "udp6" and "tcp6" for UDP and TCP over IPv6,
585 * respectively.
586 *
587 * The contents of @address determine the address family and the
588 * port to be registered. The usual practice is to pass INADDR_ANY
589 * as the raw address, but specifying a non-zero address is also
590 * supported by this API if the caller wishes to advertise an RPC
591 * service on a specific network interface.
592 *
593 * Note that passing in INADDR_ANY does not create the same service
594 * registration as IN6ADDR_ANY. The former advertises an RPC
595 * service on any IPv4 address, but not on IPv6. The latter
596 * advertises the service on all IPv4 and IPv6 addresses.
597 */
598int rpcb_v4_register(struct net *net, const u32 program, const u32 version,
599 const struct sockaddr *address, const char *netid)
600{
601 struct rpcbind_args map = {
602 .r_prog = program,
603 .r_vers = version,
604 .r_netid = netid,
605 .r_owner = RPCB_OWNER_STRING,
606 };
607 struct rpc_message msg = {
608 .rpc_argp = &map,
609 };
610 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
611
612 if (sn->rpcb_local_clnt4 == NULL)
613 return -EPROTONOSUPPORT;
614
615 if (address == NULL)
616 return rpcb_unregister_all_protofamilies(sn, &msg);
617
618 switch (address->sa_family) {
619 case AF_INET:
620 return rpcb_register_inet4(sn, address, &msg);
621 case AF_INET6:
622 return rpcb_register_inet6(sn, address, &msg);
623 }
624
625 return -EAFNOSUPPORT;
626}
627
628static struct rpc_task *rpcb_call_async(struct rpc_clnt *rpcb_clnt,
629 struct rpcbind_args *map, const struct rpc_procinfo *proc)
630{
631 struct rpc_message msg = {
632 .rpc_proc = proc,
633 .rpc_argp = map,
634 .rpc_resp = map,
635 };
636 struct rpc_task_setup task_setup_data = {
637 .rpc_client = rpcb_clnt,
638 .rpc_message = &msg,
639 .callback_ops = &rpcb_getport_ops,
640 .callback_data = map,
641 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFTCONN,
642 };
643
644 return rpc_run_task(&task_setup_data);
645}
646
647/*
648 * In the case where rpc clients have been cloned, we want to make
649 * sure that we use the program number/version etc of the actual
650 * owner of the xprt. To do so, we walk back up the tree of parents
651 * to find whoever created the transport and/or whoever has the
652 * autobind flag set.
653 */
654static struct rpc_clnt *rpcb_find_transport_owner(struct rpc_clnt *clnt)
655{
656 struct rpc_clnt *parent = clnt->cl_parent;
657 struct rpc_xprt_switch *xps = rcu_access_pointer(clnt->cl_xpi.xpi_xpswitch);
658
659 while (parent != clnt) {
660 if (rcu_access_pointer(parent->cl_xpi.xpi_xpswitch) != xps)
661 break;
662 if (clnt->cl_autobind)
663 break;
664 clnt = parent;
665 parent = parent->cl_parent;
666 }
667 return clnt;
668}
669
670/**
671 * rpcb_getport_async - obtain the port for a given RPC service on a given host
672 * @task: task that is waiting for portmapper request
673 *
674 * This one can be called for an ongoing RPC request, and can be used in
675 * an async (rpciod) context.
676 */
677void rpcb_getport_async(struct rpc_task *task)
678{
679 struct rpc_clnt *clnt;
680 const struct rpc_procinfo *proc;
681 u32 bind_version;
682 struct rpc_xprt *xprt;
683 struct rpc_clnt *rpcb_clnt;
684 struct rpcbind_args *map;
685 struct rpc_task *child;
686 struct sockaddr_storage addr;
687 struct sockaddr *sap = (struct sockaddr *)&addr;
688 size_t salen;
689 int status;
690
691 rcu_read_lock();
692 clnt = rpcb_find_transport_owner(task->tk_client);
693 rcu_read_unlock();
694 xprt = xprt_get(task->tk_xprt);
695
696 dprintk("RPC: %5u %s(%s, %u, %u, %d)\n",
697 task->tk_pid, __func__,
698 xprt->servername, clnt->cl_prog, clnt->cl_vers, xprt->prot);
699
700 /* Put self on the wait queue to ensure we get notified if
701 * some other task is already attempting to bind the port */
702 rpc_sleep_on_timeout(&xprt->binding, task,
703 NULL, jiffies + xprt->bind_timeout);
704
705 if (xprt_test_and_set_binding(xprt)) {
706 dprintk("RPC: %5u %s: waiting for another binder\n",
707 task->tk_pid, __func__);
708 xprt_put(xprt);
709 return;
710 }
711
712 /* Someone else may have bound if we slept */
713 if (xprt_bound(xprt)) {
714 status = 0;
715 dprintk("RPC: %5u %s: already bound\n",
716 task->tk_pid, __func__);
717 goto bailout_nofree;
718 }
719
720 /* Parent transport's destination address */
721 salen = rpc_peeraddr(clnt, sap, sizeof(addr));
722
723 /* Don't ever use rpcbind v2 for AF_INET6 requests */
724 switch (sap->sa_family) {
725 case AF_INET:
726 proc = rpcb_next_version[xprt->bind_index].rpc_proc;
727 bind_version = rpcb_next_version[xprt->bind_index].rpc_vers;
728 break;
729 case AF_INET6:
730 proc = rpcb_next_version6[xprt->bind_index].rpc_proc;
731 bind_version = rpcb_next_version6[xprt->bind_index].rpc_vers;
732 break;
733 default:
734 status = -EAFNOSUPPORT;
735 dprintk("RPC: %5u %s: bad address family\n",
736 task->tk_pid, __func__);
737 goto bailout_nofree;
738 }
739 if (proc == NULL) {
740 xprt->bind_index = 0;
741 status = -EPFNOSUPPORT;
742 dprintk("RPC: %5u %s: no more getport versions available\n",
743 task->tk_pid, __func__);
744 goto bailout_nofree;
745 }
746
747 dprintk("RPC: %5u %s: trying rpcbind version %u\n",
748 task->tk_pid, __func__, bind_version);
749
750 rpcb_clnt = rpcb_create(xprt->xprt_net,
751 clnt->cl_nodename,
752 xprt->servername, sap, salen,
753 xprt->prot, bind_version,
754 clnt->cl_cred);
755 if (IS_ERR(rpcb_clnt)) {
756 status = PTR_ERR(rpcb_clnt);
757 dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n",
758 task->tk_pid, __func__, PTR_ERR(rpcb_clnt));
759 goto bailout_nofree;
760 }
761
762 map = kzalloc(sizeof(struct rpcbind_args), GFP_NOFS);
763 if (!map) {
764 status = -ENOMEM;
765 dprintk("RPC: %5u %s: no memory available\n",
766 task->tk_pid, __func__);
767 goto bailout_release_client;
768 }
769 map->r_prog = clnt->cl_prog;
770 map->r_vers = clnt->cl_vers;
771 map->r_prot = xprt->prot;
772 map->r_port = 0;
773 map->r_xprt = xprt;
774 map->r_status = -EIO;
775
776 switch (bind_version) {
777 case RPCBVERS_4:
778 case RPCBVERS_3:
779 map->r_netid = xprt->address_strings[RPC_DISPLAY_NETID];
780 map->r_addr = rpc_sockaddr2uaddr(sap, GFP_NOFS);
781 if (!map->r_addr) {
782 status = -ENOMEM;
783 dprintk("RPC: %5u %s: no memory available\n",
784 task->tk_pid, __func__);
785 goto bailout_free_args;
786 }
787 map->r_owner = "";
788 break;
789 case RPCBVERS_2:
790 map->r_addr = NULL;
791 break;
792 default:
793 BUG();
794 }
795
796 child = rpcb_call_async(rpcb_clnt, map, proc);
797 rpc_release_client(rpcb_clnt);
798
799 xprt->stat.bind_count++;
800 rpc_put_task(child);
801 return;
802
803bailout_free_args:
804 kfree(map);
805bailout_release_client:
806 rpc_release_client(rpcb_clnt);
807bailout_nofree:
808 rpcb_wake_rpcbind_waiters(xprt, status);
809 task->tk_status = status;
810 xprt_put(xprt);
811}
812EXPORT_SYMBOL_GPL(rpcb_getport_async);
813
814/*
815 * Rpcbind child task calls this callback via tk_exit.
816 */
817static void rpcb_getport_done(struct rpc_task *child, void *data)
818{
819 struct rpcbind_args *map = data;
820 struct rpc_xprt *xprt = map->r_xprt;
821 int status = child->tk_status;
822
823 /* Garbage reply: retry with a lesser rpcbind version */
824 if (status == -EIO)
825 status = -EPROTONOSUPPORT;
826
827 /* rpcbind server doesn't support this rpcbind protocol version */
828 if (status == -EPROTONOSUPPORT)
829 xprt->bind_index++;
830
831 if (status < 0) {
832 /* rpcbind server not available on remote host? */
833 xprt->ops->set_port(xprt, 0);
834 } else if (map->r_port == 0) {
835 /* Requested RPC service wasn't registered on remote host */
836 xprt->ops->set_port(xprt, 0);
837 status = -EACCES;
838 } else {
839 /* Succeeded */
840 xprt->ops->set_port(xprt, map->r_port);
841 xprt_set_bound(xprt);
842 status = 0;
843 }
844
845 dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n",
846 child->tk_pid, status, map->r_port);
847
848 map->r_status = status;
849}
850
851/*
852 * XDR functions for rpcbind
853 */
854
855static void rpcb_enc_mapping(struct rpc_rqst *req, struct xdr_stream *xdr,
856 const void *data)
857{
858 const struct rpcbind_args *rpcb = data;
859 __be32 *p;
860
861 dprintk("RPC: %5u encoding PMAP_%s call (%u, %u, %d, %u)\n",
862 req->rq_task->tk_pid,
863 req->rq_task->tk_msg.rpc_proc->p_name,
864 rpcb->r_prog, rpcb->r_vers, rpcb->r_prot, rpcb->r_port);
865
866 p = xdr_reserve_space(xdr, RPCB_mappingargs_sz << 2);
867 *p++ = cpu_to_be32(rpcb->r_prog);
868 *p++ = cpu_to_be32(rpcb->r_vers);
869 *p++ = cpu_to_be32(rpcb->r_prot);
870 *p = cpu_to_be32(rpcb->r_port);
871}
872
873static int rpcb_dec_getport(struct rpc_rqst *req, struct xdr_stream *xdr,
874 void *data)
875{
876 struct rpcbind_args *rpcb = data;
877 unsigned long port;
878 __be32 *p;
879
880 rpcb->r_port = 0;
881
882 p = xdr_inline_decode(xdr, 4);
883 if (unlikely(p == NULL))
884 return -EIO;
885
886 port = be32_to_cpup(p);
887 dprintk("RPC: %5u PMAP_%s result: %lu\n", req->rq_task->tk_pid,
888 req->rq_task->tk_msg.rpc_proc->p_name, port);
889 if (unlikely(port > USHRT_MAX))
890 return -EIO;
891
892 rpcb->r_port = port;
893 return 0;
894}
895
896static int rpcb_dec_set(struct rpc_rqst *req, struct xdr_stream *xdr,
897 void *data)
898{
899 unsigned int *boolp = data;
900 __be32 *p;
901
902 p = xdr_inline_decode(xdr, 4);
903 if (unlikely(p == NULL))
904 return -EIO;
905
906 *boolp = 0;
907 if (*p != xdr_zero)
908 *boolp = 1;
909
910 dprintk("RPC: %5u RPCB_%s call %s\n",
911 req->rq_task->tk_pid,
912 req->rq_task->tk_msg.rpc_proc->p_name,
913 (*boolp ? "succeeded" : "failed"));
914 return 0;
915}
916
917static void encode_rpcb_string(struct xdr_stream *xdr, const char *string,
918 const u32 maxstrlen)
919{
920 __be32 *p;
921 u32 len;
922
923 len = strlen(string);
924 WARN_ON_ONCE(len > maxstrlen);
925 if (len > maxstrlen)
926 /* truncate and hope for the best */
927 len = maxstrlen;
928 p = xdr_reserve_space(xdr, 4 + len);
929 xdr_encode_opaque(p, string, len);
930}
931
932static void rpcb_enc_getaddr(struct rpc_rqst *req, struct xdr_stream *xdr,
933 const void *data)
934{
935 const struct rpcbind_args *rpcb = data;
936 __be32 *p;
937
938 dprintk("RPC: %5u encoding RPCB_%s call (%u, %u, '%s', '%s')\n",
939 req->rq_task->tk_pid,
940 req->rq_task->tk_msg.rpc_proc->p_name,
941 rpcb->r_prog, rpcb->r_vers,
942 rpcb->r_netid, rpcb->r_addr);
943
944 p = xdr_reserve_space(xdr, (RPCB_program_sz + RPCB_version_sz) << 2);
945 *p++ = cpu_to_be32(rpcb->r_prog);
946 *p = cpu_to_be32(rpcb->r_vers);
947
948 encode_rpcb_string(xdr, rpcb->r_netid, RPCBIND_MAXNETIDLEN);
949 encode_rpcb_string(xdr, rpcb->r_addr, RPCBIND_MAXUADDRLEN);
950 encode_rpcb_string(xdr, rpcb->r_owner, RPCB_MAXOWNERLEN);
951}
952
953static int rpcb_dec_getaddr(struct rpc_rqst *req, struct xdr_stream *xdr,
954 void *data)
955{
956 struct rpcbind_args *rpcb = data;
957 struct sockaddr_storage address;
958 struct sockaddr *sap = (struct sockaddr *)&address;
959 __be32 *p;
960 u32 len;
961
962 rpcb->r_port = 0;
963
964 p = xdr_inline_decode(xdr, 4);
965 if (unlikely(p == NULL))
966 goto out_fail;
967 len = be32_to_cpup(p);
968
969 /*
970 * If the returned universal address is a null string,
971 * the requested RPC service was not registered.
972 */
973 if (len == 0) {
974 dprintk("RPC: %5u RPCB reply: program not registered\n",
975 req->rq_task->tk_pid);
976 return 0;
977 }
978
979 if (unlikely(len > RPCBIND_MAXUADDRLEN))
980 goto out_fail;
981
982 p = xdr_inline_decode(xdr, len);
983 if (unlikely(p == NULL))
984 goto out_fail;
985 dprintk("RPC: %5u RPCB_%s reply: %*pE\n", req->rq_task->tk_pid,
986 req->rq_task->tk_msg.rpc_proc->p_name, len, (char *)p);
987
988 if (rpc_uaddr2sockaddr(req->rq_xprt->xprt_net, (char *)p, len,
989 sap, sizeof(address)) == 0)
990 goto out_fail;
991 rpcb->r_port = rpc_get_port(sap);
992
993 return 0;
994
995out_fail:
996 dprintk("RPC: %5u malformed RPCB_%s reply\n",
997 req->rq_task->tk_pid,
998 req->rq_task->tk_msg.rpc_proc->p_name);
999 return -EIO;
1000}
1001
1002/*
1003 * Not all rpcbind procedures described in RFC 1833 are implemented
1004 * since the Linux kernel RPC code requires only these.
1005 */
1006
1007static const struct rpc_procinfo rpcb_procedures2[] = {
1008 [RPCBPROC_SET] = {
1009 .p_proc = RPCBPROC_SET,
1010 .p_encode = rpcb_enc_mapping,
1011 .p_decode = rpcb_dec_set,
1012 .p_arglen = RPCB_mappingargs_sz,
1013 .p_replen = RPCB_setres_sz,
1014 .p_statidx = RPCBPROC_SET,
1015 .p_timer = 0,
1016 .p_name = "SET",
1017 },
1018 [RPCBPROC_UNSET] = {
1019 .p_proc = RPCBPROC_UNSET,
1020 .p_encode = rpcb_enc_mapping,
1021 .p_decode = rpcb_dec_set,
1022 .p_arglen = RPCB_mappingargs_sz,
1023 .p_replen = RPCB_setres_sz,
1024 .p_statidx = RPCBPROC_UNSET,
1025 .p_timer = 0,
1026 .p_name = "UNSET",
1027 },
1028 [RPCBPROC_GETPORT] = {
1029 .p_proc = RPCBPROC_GETPORT,
1030 .p_encode = rpcb_enc_mapping,
1031 .p_decode = rpcb_dec_getport,
1032 .p_arglen = RPCB_mappingargs_sz,
1033 .p_replen = RPCB_getportres_sz,
1034 .p_statidx = RPCBPROC_GETPORT,
1035 .p_timer = 0,
1036 .p_name = "GETPORT",
1037 },
1038};
1039
1040static const struct rpc_procinfo rpcb_procedures3[] = {
1041 [RPCBPROC_SET] = {
1042 .p_proc = RPCBPROC_SET,
1043 .p_encode = rpcb_enc_getaddr,
1044 .p_decode = rpcb_dec_set,
1045 .p_arglen = RPCB_getaddrargs_sz,
1046 .p_replen = RPCB_setres_sz,
1047 .p_statidx = RPCBPROC_SET,
1048 .p_timer = 0,
1049 .p_name = "SET",
1050 },
1051 [RPCBPROC_UNSET] = {
1052 .p_proc = RPCBPROC_UNSET,
1053 .p_encode = rpcb_enc_getaddr,
1054 .p_decode = rpcb_dec_set,
1055 .p_arglen = RPCB_getaddrargs_sz,
1056 .p_replen = RPCB_setres_sz,
1057 .p_statidx = RPCBPROC_UNSET,
1058 .p_timer = 0,
1059 .p_name = "UNSET",
1060 },
1061 [RPCBPROC_GETADDR] = {
1062 .p_proc = RPCBPROC_GETADDR,
1063 .p_encode = rpcb_enc_getaddr,
1064 .p_decode = rpcb_dec_getaddr,
1065 .p_arglen = RPCB_getaddrargs_sz,
1066 .p_replen = RPCB_getaddrres_sz,
1067 .p_statidx = RPCBPROC_GETADDR,
1068 .p_timer = 0,
1069 .p_name = "GETADDR",
1070 },
1071};
1072
1073static const struct rpc_procinfo rpcb_procedures4[] = {
1074 [RPCBPROC_SET] = {
1075 .p_proc = RPCBPROC_SET,
1076 .p_encode = rpcb_enc_getaddr,
1077 .p_decode = rpcb_dec_set,
1078 .p_arglen = RPCB_getaddrargs_sz,
1079 .p_replen = RPCB_setres_sz,
1080 .p_statidx = RPCBPROC_SET,
1081 .p_timer = 0,
1082 .p_name = "SET",
1083 },
1084 [RPCBPROC_UNSET] = {
1085 .p_proc = RPCBPROC_UNSET,
1086 .p_encode = rpcb_enc_getaddr,
1087 .p_decode = rpcb_dec_set,
1088 .p_arglen = RPCB_getaddrargs_sz,
1089 .p_replen = RPCB_setres_sz,
1090 .p_statidx = RPCBPROC_UNSET,
1091 .p_timer = 0,
1092 .p_name = "UNSET",
1093 },
1094 [RPCBPROC_GETADDR] = {
1095 .p_proc = RPCBPROC_GETADDR,
1096 .p_encode = rpcb_enc_getaddr,
1097 .p_decode = rpcb_dec_getaddr,
1098 .p_arglen = RPCB_getaddrargs_sz,
1099 .p_replen = RPCB_getaddrres_sz,
1100 .p_statidx = RPCBPROC_GETADDR,
1101 .p_timer = 0,
1102 .p_name = "GETADDR",
1103 },
1104};
1105
1106static const struct rpcb_info rpcb_next_version[] = {
1107 {
1108 .rpc_vers = RPCBVERS_2,
1109 .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT],
1110 },
1111 {
1112 .rpc_proc = NULL,
1113 },
1114};
1115
1116static const struct rpcb_info rpcb_next_version6[] = {
1117 {
1118 .rpc_vers = RPCBVERS_4,
1119 .rpc_proc = &rpcb_procedures4[RPCBPROC_GETADDR],
1120 },
1121 {
1122 .rpc_vers = RPCBVERS_3,
1123 .rpc_proc = &rpcb_procedures3[RPCBPROC_GETADDR],
1124 },
1125 {
1126 .rpc_proc = NULL,
1127 },
1128};
1129
1130static unsigned int rpcb_version2_counts[ARRAY_SIZE(rpcb_procedures2)];
1131static const struct rpc_version rpcb_version2 = {
1132 .number = RPCBVERS_2,
1133 .nrprocs = ARRAY_SIZE(rpcb_procedures2),
1134 .procs = rpcb_procedures2,
1135 .counts = rpcb_version2_counts,
1136};
1137
1138static unsigned int rpcb_version3_counts[ARRAY_SIZE(rpcb_procedures3)];
1139static const struct rpc_version rpcb_version3 = {
1140 .number = RPCBVERS_3,
1141 .nrprocs = ARRAY_SIZE(rpcb_procedures3),
1142 .procs = rpcb_procedures3,
1143 .counts = rpcb_version3_counts,
1144};
1145
1146static unsigned int rpcb_version4_counts[ARRAY_SIZE(rpcb_procedures4)];
1147static const struct rpc_version rpcb_version4 = {
1148 .number = RPCBVERS_4,
1149 .nrprocs = ARRAY_SIZE(rpcb_procedures4),
1150 .procs = rpcb_procedures4,
1151 .counts = rpcb_version4_counts,
1152};
1153
1154static const struct rpc_version *rpcb_version[] = {
1155 NULL,
1156 NULL,
1157 &rpcb_version2,
1158 &rpcb_version3,
1159 &rpcb_version4
1160};
1161
1162static struct rpc_stat rpcb_stats;
1163
1164static const struct rpc_program rpcb_program = {
1165 .name = "rpcbind",
1166 .number = RPCBIND_PROGRAM,
1167 .nrvers = ARRAY_SIZE(rpcb_version),
1168 .version = rpcb_version,
1169 .stats = &rpcb_stats,
1170};