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1/*
2 * In-kernel rpcbind client supporting versions 2, 3, and 4 of the rpcbind
3 * protocol
4 *
5 * Based on RFC 1833: "Binding Protocols for ONC RPC Version 2" and
6 * RFC 3530: "Network File System (NFS) version 4 Protocol"
7 *
8 * Original: Gilles Quillard, Bull Open Source, 2005 <gilles.quillard@bull.net>
9 * Updated: Chuck Lever, Oracle Corporation, 2007 <chuck.lever@oracle.com>
10 *
11 * Descended from net/sunrpc/pmap_clnt.c,
12 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
13 */
14
15#include <linux/module.h>
16
17#include <linux/types.h>
18#include <linux/socket.h>
19#include <linux/un.h>
20#include <linux/in.h>
21#include <linux/in6.h>
22#include <linux/kernel.h>
23#include <linux/errno.h>
24#include <linux/mutex.h>
25#include <linux/slab.h>
26#include <net/ipv6.h>
27
28#include <linux/sunrpc/clnt.h>
29#include <linux/sunrpc/addr.h>
30#include <linux/sunrpc/sched.h>
31#include <linux/sunrpc/xprtsock.h>
32
33#include "netns.h"
34
35#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
36# define RPCDBG_FACILITY RPCDBG_BIND
37#endif
38
39#define RPCBIND_SOCK_PATHNAME "/var/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 struct rpc_procinfo rpcb_procedures2[];
132static struct rpc_procinfo rpcb_procedures3[];
133static struct rpc_procinfo rpcb_procedures4[];
134
135struct rpcb_info {
136 u32 rpc_vers;
137 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 dprintk("RPC: created new rpcb local clients (rpcb_local_clnt: "
219 "%p, rpcb_local_clnt4: %p) for net %p%s\n",
220 sn->rpcb_local_clnt, sn->rpcb_local_clnt4,
221 net, (net == &init_net) ? " (init_net)" : "");
222}
223
224/*
225 * Returns zero on success, otherwise a negative errno value
226 * is returned.
227 */
228static int rpcb_create_local_unix(struct net *net)
229{
230 static const struct sockaddr_un rpcb_localaddr_rpcbind = {
231 .sun_family = AF_LOCAL,
232 .sun_path = RPCBIND_SOCK_PATHNAME,
233 };
234 struct rpc_create_args args = {
235 .net = net,
236 .protocol = XPRT_TRANSPORT_LOCAL,
237 .address = (struct sockaddr *)&rpcb_localaddr_rpcbind,
238 .addrsize = sizeof(rpcb_localaddr_rpcbind),
239 .servername = "localhost",
240 .program = &rpcb_program,
241 .version = RPCBVERS_2,
242 .authflavor = RPC_AUTH_NULL,
243 /*
244 * We turn off the idle timeout to prevent the kernel
245 * from automatically disconnecting the socket.
246 * Otherwise, we'd have to cache the mount namespace
247 * of the caller and somehow pass that to the socket
248 * reconnect code.
249 */
250 .flags = RPC_CLNT_CREATE_NO_IDLE_TIMEOUT,
251 };
252 struct rpc_clnt *clnt, *clnt4;
253 int result = 0;
254
255 /*
256 * Because we requested an RPC PING at transport creation time,
257 * this works only if the user space portmapper is rpcbind, and
258 * it's listening on AF_LOCAL on the named socket.
259 */
260 clnt = rpc_create(&args);
261 if (IS_ERR(clnt)) {
262 dprintk("RPC: failed to create AF_LOCAL rpcbind "
263 "client (errno %ld).\n", PTR_ERR(clnt));
264 result = PTR_ERR(clnt);
265 goto out;
266 }
267
268 clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4);
269 if (IS_ERR(clnt4)) {
270 dprintk("RPC: failed to bind second program to "
271 "rpcbind v4 client (errno %ld).\n",
272 PTR_ERR(clnt4));
273 clnt4 = NULL;
274 }
275
276 rpcb_set_local(net, clnt, clnt4, true);
277
278out:
279 return result;
280}
281
282/*
283 * Returns zero on success, otherwise a negative errno value
284 * is returned.
285 */
286static int rpcb_create_local_net(struct net *net)
287{
288 static const struct sockaddr_in rpcb_inaddr_loopback = {
289 .sin_family = AF_INET,
290 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
291 .sin_port = htons(RPCBIND_PORT),
292 };
293 struct rpc_create_args args = {
294 .net = net,
295 .protocol = XPRT_TRANSPORT_TCP,
296 .address = (struct sockaddr *)&rpcb_inaddr_loopback,
297 .addrsize = sizeof(rpcb_inaddr_loopback),
298 .servername = "localhost",
299 .program = &rpcb_program,
300 .version = RPCBVERS_2,
301 .authflavor = RPC_AUTH_UNIX,
302 .flags = RPC_CLNT_CREATE_NOPING,
303 };
304 struct rpc_clnt *clnt, *clnt4;
305 int result = 0;
306
307 clnt = rpc_create(&args);
308 if (IS_ERR(clnt)) {
309 dprintk("RPC: failed to create local rpcbind "
310 "client (errno %ld).\n", PTR_ERR(clnt));
311 result = PTR_ERR(clnt);
312 goto out;
313 }
314
315 /*
316 * This results in an RPC ping. On systems running portmapper,
317 * the v4 ping will fail. Proceed anyway, but disallow rpcb
318 * v4 upcalls.
319 */
320 clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4);
321 if (IS_ERR(clnt4)) {
322 dprintk("RPC: failed to bind second program to "
323 "rpcbind v4 client (errno %ld).\n",
324 PTR_ERR(clnt4));
325 clnt4 = NULL;
326 }
327
328 rpcb_set_local(net, clnt, clnt4, false);
329
330out:
331 return result;
332}
333
334/*
335 * Returns zero on success, otherwise a negative errno value
336 * is returned.
337 */
338int rpcb_create_local(struct net *net)
339{
340 static DEFINE_MUTEX(rpcb_create_local_mutex);
341 int result = 0;
342
343 if (rpcb_get_local(net))
344 return result;
345
346 mutex_lock(&rpcb_create_local_mutex);
347 if (rpcb_get_local(net))
348 goto out;
349
350 if (rpcb_create_local_unix(net) != 0)
351 result = rpcb_create_local_net(net);
352
353out:
354 mutex_unlock(&rpcb_create_local_mutex);
355 return result;
356}
357
358static struct rpc_clnt *rpcb_create(struct net *net, const char *nodename,
359 const char *hostname,
360 struct sockaddr *srvaddr, size_t salen,
361 int proto, u32 version)
362{
363 struct rpc_create_args args = {
364 .net = net,
365 .protocol = proto,
366 .address = srvaddr,
367 .addrsize = salen,
368 .servername = hostname,
369 .nodename = nodename,
370 .program = &rpcb_program,
371 .version = version,
372 .authflavor = RPC_AUTH_UNIX,
373 .flags = (RPC_CLNT_CREATE_NOPING |
374 RPC_CLNT_CREATE_NONPRIVPORT),
375 };
376
377 switch (srvaddr->sa_family) {
378 case AF_INET:
379 ((struct sockaddr_in *)srvaddr)->sin_port = htons(RPCBIND_PORT);
380 break;
381 case AF_INET6:
382 ((struct sockaddr_in6 *)srvaddr)->sin6_port = htons(RPCBIND_PORT);
383 break;
384 default:
385 return ERR_PTR(-EAFNOSUPPORT);
386 }
387
388 return rpc_create(&args);
389}
390
391static int rpcb_register_call(struct sunrpc_net *sn, struct rpc_clnt *clnt, struct rpc_message *msg, bool is_set)
392{
393 int flags = RPC_TASK_NOCONNECT;
394 int error, result = 0;
395
396 if (is_set || !sn->rpcb_is_af_local)
397 flags = RPC_TASK_SOFTCONN;
398 msg->rpc_resp = &result;
399
400 error = rpc_call_sync(clnt, msg, flags);
401 if (error < 0) {
402 dprintk("RPC: failed to contact local rpcbind "
403 "server (errno %d).\n", -error);
404 return error;
405 }
406
407 if (!result)
408 return -EACCES;
409 return 0;
410}
411
412/**
413 * rpcb_register - set or unset a port registration with the local rpcbind svc
414 * @net: target network namespace
415 * @prog: RPC program number to bind
416 * @vers: RPC version number to bind
417 * @prot: transport protocol to register
418 * @port: port value to register
419 *
420 * Returns zero if the registration request was dispatched successfully
421 * and the rpcbind daemon returned success. Otherwise, returns an errno
422 * value that reflects the nature of the error (request could not be
423 * dispatched, timed out, or rpcbind returned an error).
424 *
425 * RPC services invoke this function to advertise their contact
426 * information via the system's rpcbind daemon. RPC services
427 * invoke this function once for each [program, version, transport]
428 * tuple they wish to advertise.
429 *
430 * Callers may also unregister RPC services that are no longer
431 * available by setting the passed-in port to zero. This removes
432 * all registered transports for [program, version] from the local
433 * rpcbind database.
434 *
435 * This function uses rpcbind protocol version 2 to contact the
436 * local rpcbind daemon.
437 *
438 * Registration works over both AF_INET and AF_INET6, and services
439 * registered via this function are advertised as available for any
440 * address. If the local rpcbind daemon is listening on AF_INET6,
441 * services registered via this function will be advertised on
442 * IN6ADDR_ANY (ie available for all AF_INET and AF_INET6
443 * addresses).
444 */
445int rpcb_register(struct net *net, u32 prog, u32 vers, int prot, unsigned short port)
446{
447 struct rpcbind_args map = {
448 .r_prog = prog,
449 .r_vers = vers,
450 .r_prot = prot,
451 .r_port = port,
452 };
453 struct rpc_message msg = {
454 .rpc_argp = &map,
455 };
456 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
457 bool is_set = false;
458
459 dprintk("RPC: %sregistering (%u, %u, %d, %u) with local "
460 "rpcbind\n", (port ? "" : "un"),
461 prog, vers, prot, port);
462
463 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_UNSET];
464 if (port != 0) {
465 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_SET];
466 is_set = true;
467 }
468
469 return rpcb_register_call(sn, sn->rpcb_local_clnt, &msg, is_set);
470}
471
472/*
473 * Fill in AF_INET family-specific arguments to register
474 */
475static int rpcb_register_inet4(struct sunrpc_net *sn,
476 const struct sockaddr *sap,
477 struct rpc_message *msg)
478{
479 const struct sockaddr_in *sin = (const struct sockaddr_in *)sap;
480 struct rpcbind_args *map = msg->rpc_argp;
481 unsigned short port = ntohs(sin->sin_port);
482 bool is_set = false;
483 int result;
484
485 map->r_addr = rpc_sockaddr2uaddr(sap, GFP_KERNEL);
486
487 dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with "
488 "local rpcbind\n", (port ? "" : "un"),
489 map->r_prog, map->r_vers,
490 map->r_addr, map->r_netid);
491
492 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
493 if (port != 0) {
494 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
495 is_set = true;
496 }
497
498 result = rpcb_register_call(sn, sn->rpcb_local_clnt4, msg, is_set);
499 kfree(map->r_addr);
500 return result;
501}
502
503/*
504 * Fill in AF_INET6 family-specific arguments to register
505 */
506static int rpcb_register_inet6(struct sunrpc_net *sn,
507 const struct sockaddr *sap,
508 struct rpc_message *msg)
509{
510 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sap;
511 struct rpcbind_args *map = msg->rpc_argp;
512 unsigned short port = ntohs(sin6->sin6_port);
513 bool is_set = false;
514 int result;
515
516 map->r_addr = rpc_sockaddr2uaddr(sap, GFP_KERNEL);
517
518 dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with "
519 "local rpcbind\n", (port ? "" : "un"),
520 map->r_prog, map->r_vers,
521 map->r_addr, map->r_netid);
522
523 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
524 if (port != 0) {
525 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
526 is_set = true;
527 }
528
529 result = rpcb_register_call(sn, sn->rpcb_local_clnt4, msg, is_set);
530 kfree(map->r_addr);
531 return result;
532}
533
534static int rpcb_unregister_all_protofamilies(struct sunrpc_net *sn,
535 struct rpc_message *msg)
536{
537 struct rpcbind_args *map = msg->rpc_argp;
538
539 dprintk("RPC: unregistering [%u, %u, '%s'] with "
540 "local rpcbind\n",
541 map->r_prog, map->r_vers, map->r_netid);
542
543 map->r_addr = "";
544 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
545
546 return rpcb_register_call(sn, sn->rpcb_local_clnt4, msg, false);
547}
548
549/**
550 * rpcb_v4_register - set or unset a port registration with the local rpcbind
551 * @net: target network namespace
552 * @program: RPC program number of service to (un)register
553 * @version: RPC version number of service to (un)register
554 * @address: address family, IP address, and port to (un)register
555 * @netid: netid of transport protocol to (un)register
556 *
557 * Returns zero if the registration request was dispatched successfully
558 * and the rpcbind daemon returned success. Otherwise, returns an errno
559 * value that reflects the nature of the error (request could not be
560 * dispatched, timed out, or rpcbind returned an error).
561 *
562 * RPC services invoke this function to advertise their contact
563 * information via the system's rpcbind daemon. RPC services
564 * invoke this function once for each [program, version, address,
565 * netid] tuple they wish to advertise.
566 *
567 * Callers may also unregister RPC services that are registered at a
568 * specific address by setting the port number in @address to zero.
569 * They may unregister all registered protocol families at once for
570 * a service by passing a NULL @address argument. If @netid is ""
571 * then all netids for [program, version, address] are unregistered.
572 *
573 * This function uses rpcbind protocol version 4 to contact the
574 * local rpcbind daemon. The local rpcbind daemon must support
575 * version 4 of the rpcbind protocol in order for these functions
576 * to register a service successfully.
577 *
578 * Supported netids include "udp" and "tcp" for UDP and TCP over
579 * IPv4, and "udp6" and "tcp6" for UDP and TCP over IPv6,
580 * respectively.
581 *
582 * The contents of @address determine the address family and the
583 * port to be registered. The usual practice is to pass INADDR_ANY
584 * as the raw address, but specifying a non-zero address is also
585 * supported by this API if the caller wishes to advertise an RPC
586 * service on a specific network interface.
587 *
588 * Note that passing in INADDR_ANY does not create the same service
589 * registration as IN6ADDR_ANY. The former advertises an RPC
590 * service on any IPv4 address, but not on IPv6. The latter
591 * advertises the service on all IPv4 and IPv6 addresses.
592 */
593int rpcb_v4_register(struct net *net, const u32 program, const u32 version,
594 const struct sockaddr *address, const char *netid)
595{
596 struct rpcbind_args map = {
597 .r_prog = program,
598 .r_vers = version,
599 .r_netid = netid,
600 .r_owner = RPCB_OWNER_STRING,
601 };
602 struct rpc_message msg = {
603 .rpc_argp = &map,
604 };
605 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
606
607 if (sn->rpcb_local_clnt4 == NULL)
608 return -EPROTONOSUPPORT;
609
610 if (address == NULL)
611 return rpcb_unregister_all_protofamilies(sn, &msg);
612
613 switch (address->sa_family) {
614 case AF_INET:
615 return rpcb_register_inet4(sn, address, &msg);
616 case AF_INET6:
617 return rpcb_register_inet6(sn, address, &msg);
618 }
619
620 return -EAFNOSUPPORT;
621}
622
623static struct rpc_task *rpcb_call_async(struct rpc_clnt *rpcb_clnt, struct rpcbind_args *map, struct rpc_procinfo *proc)
624{
625 struct rpc_message msg = {
626 .rpc_proc = proc,
627 .rpc_argp = map,
628 .rpc_resp = map,
629 };
630 struct rpc_task_setup task_setup_data = {
631 .rpc_client = rpcb_clnt,
632 .rpc_message = &msg,
633 .callback_ops = &rpcb_getport_ops,
634 .callback_data = map,
635 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFTCONN,
636 };
637
638 return rpc_run_task(&task_setup_data);
639}
640
641/*
642 * In the case where rpc clients have been cloned, we want to make
643 * sure that we use the program number/version etc of the actual
644 * owner of the xprt. To do so, we walk back up the tree of parents
645 * to find whoever created the transport and/or whoever has the
646 * autobind flag set.
647 */
648static struct rpc_clnt *rpcb_find_transport_owner(struct rpc_clnt *clnt)
649{
650 struct rpc_clnt *parent = clnt->cl_parent;
651 struct rpc_xprt_switch *xps = rcu_access_pointer(clnt->cl_xpi.xpi_xpswitch);
652
653 while (parent != clnt) {
654 if (rcu_access_pointer(parent->cl_xpi.xpi_xpswitch) != xps)
655 break;
656 if (clnt->cl_autobind)
657 break;
658 clnt = parent;
659 parent = parent->cl_parent;
660 }
661 return clnt;
662}
663
664/**
665 * rpcb_getport_async - obtain the port for a given RPC service on a given host
666 * @task: task that is waiting for portmapper request
667 *
668 * This one can be called for an ongoing RPC request, and can be used in
669 * an async (rpciod) context.
670 */
671void rpcb_getport_async(struct rpc_task *task)
672{
673 struct rpc_clnt *clnt;
674 struct rpc_procinfo *proc;
675 u32 bind_version;
676 struct rpc_xprt *xprt;
677 struct rpc_clnt *rpcb_clnt;
678 struct rpcbind_args *map;
679 struct rpc_task *child;
680 struct sockaddr_storage addr;
681 struct sockaddr *sap = (struct sockaddr *)&addr;
682 size_t salen;
683 int status;
684
685 rcu_read_lock();
686 clnt = rpcb_find_transport_owner(task->tk_client);
687 rcu_read_unlock();
688 xprt = xprt_get(task->tk_xprt);
689
690 dprintk("RPC: %5u %s(%s, %u, %u, %d)\n",
691 task->tk_pid, __func__,
692 xprt->servername, clnt->cl_prog, clnt->cl_vers, xprt->prot);
693
694 /* Put self on the wait queue to ensure we get notified if
695 * some other task is already attempting to bind the port */
696 rpc_sleep_on(&xprt->binding, task, NULL);
697
698 if (xprt_test_and_set_binding(xprt)) {
699 dprintk("RPC: %5u %s: waiting for another binder\n",
700 task->tk_pid, __func__);
701 xprt_put(xprt);
702 return;
703 }
704
705 /* Someone else may have bound if we slept */
706 if (xprt_bound(xprt)) {
707 status = 0;
708 dprintk("RPC: %5u %s: already bound\n",
709 task->tk_pid, __func__);
710 goto bailout_nofree;
711 }
712
713 /* Parent transport's destination address */
714 salen = rpc_peeraddr(clnt, sap, sizeof(addr));
715
716 /* Don't ever use rpcbind v2 for AF_INET6 requests */
717 switch (sap->sa_family) {
718 case AF_INET:
719 proc = rpcb_next_version[xprt->bind_index].rpc_proc;
720 bind_version = rpcb_next_version[xprt->bind_index].rpc_vers;
721 break;
722 case AF_INET6:
723 proc = rpcb_next_version6[xprt->bind_index].rpc_proc;
724 bind_version = rpcb_next_version6[xprt->bind_index].rpc_vers;
725 break;
726 default:
727 status = -EAFNOSUPPORT;
728 dprintk("RPC: %5u %s: bad address family\n",
729 task->tk_pid, __func__);
730 goto bailout_nofree;
731 }
732 if (proc == NULL) {
733 xprt->bind_index = 0;
734 status = -EPFNOSUPPORT;
735 dprintk("RPC: %5u %s: no more getport versions available\n",
736 task->tk_pid, __func__);
737 goto bailout_nofree;
738 }
739
740 dprintk("RPC: %5u %s: trying rpcbind version %u\n",
741 task->tk_pid, __func__, bind_version);
742
743 rpcb_clnt = rpcb_create(xprt->xprt_net,
744 clnt->cl_nodename,
745 xprt->servername, sap, salen,
746 xprt->prot, bind_version);
747 if (IS_ERR(rpcb_clnt)) {
748 status = PTR_ERR(rpcb_clnt);
749 dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n",
750 task->tk_pid, __func__, PTR_ERR(rpcb_clnt));
751 goto bailout_nofree;
752 }
753
754 map = kzalloc(sizeof(struct rpcbind_args), GFP_ATOMIC);
755 if (!map) {
756 status = -ENOMEM;
757 dprintk("RPC: %5u %s: no memory available\n",
758 task->tk_pid, __func__);
759 goto bailout_release_client;
760 }
761 map->r_prog = clnt->cl_prog;
762 map->r_vers = clnt->cl_vers;
763 map->r_prot = xprt->prot;
764 map->r_port = 0;
765 map->r_xprt = xprt;
766 map->r_status = -EIO;
767
768 switch (bind_version) {
769 case RPCBVERS_4:
770 case RPCBVERS_3:
771 map->r_netid = xprt->address_strings[RPC_DISPLAY_NETID];
772 map->r_addr = rpc_sockaddr2uaddr(sap, GFP_ATOMIC);
773 map->r_owner = "";
774 break;
775 case RPCBVERS_2:
776 map->r_addr = NULL;
777 break;
778 default:
779 BUG();
780 }
781
782 child = rpcb_call_async(rpcb_clnt, map, proc);
783 rpc_release_client(rpcb_clnt);
784 if (IS_ERR(child)) {
785 /* rpcb_map_release() has freed the arguments */
786 dprintk("RPC: %5u %s: rpc_run_task failed\n",
787 task->tk_pid, __func__);
788 return;
789 }
790
791 xprt->stat.bind_count++;
792 rpc_put_task(child);
793 return;
794
795bailout_release_client:
796 rpc_release_client(rpcb_clnt);
797bailout_nofree:
798 rpcb_wake_rpcbind_waiters(xprt, status);
799 task->tk_status = status;
800 xprt_put(xprt);
801}
802EXPORT_SYMBOL_GPL(rpcb_getport_async);
803
804/*
805 * Rpcbind child task calls this callback via tk_exit.
806 */
807static void rpcb_getport_done(struct rpc_task *child, void *data)
808{
809 struct rpcbind_args *map = data;
810 struct rpc_xprt *xprt = map->r_xprt;
811 int status = child->tk_status;
812
813 /* Garbage reply: retry with a lesser rpcbind version */
814 if (status == -EIO)
815 status = -EPROTONOSUPPORT;
816
817 /* rpcbind server doesn't support this rpcbind protocol version */
818 if (status == -EPROTONOSUPPORT)
819 xprt->bind_index++;
820
821 if (status < 0) {
822 /* rpcbind server not available on remote host? */
823 xprt->ops->set_port(xprt, 0);
824 } else if (map->r_port == 0) {
825 /* Requested RPC service wasn't registered on remote host */
826 xprt->ops->set_port(xprt, 0);
827 status = -EACCES;
828 } else {
829 /* Succeeded */
830 xprt->ops->set_port(xprt, map->r_port);
831 xprt_set_bound(xprt);
832 status = 0;
833 }
834
835 dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n",
836 child->tk_pid, status, map->r_port);
837
838 map->r_status = status;
839}
840
841/*
842 * XDR functions for rpcbind
843 */
844
845static void rpcb_enc_mapping(struct rpc_rqst *req, struct xdr_stream *xdr,
846 const struct rpcbind_args *rpcb)
847{
848 __be32 *p;
849
850 dprintk("RPC: %5u encoding PMAP_%s call (%u, %u, %d, %u)\n",
851 req->rq_task->tk_pid,
852 req->rq_task->tk_msg.rpc_proc->p_name,
853 rpcb->r_prog, rpcb->r_vers, rpcb->r_prot, rpcb->r_port);
854
855 p = xdr_reserve_space(xdr, RPCB_mappingargs_sz << 2);
856 *p++ = cpu_to_be32(rpcb->r_prog);
857 *p++ = cpu_to_be32(rpcb->r_vers);
858 *p++ = cpu_to_be32(rpcb->r_prot);
859 *p = cpu_to_be32(rpcb->r_port);
860}
861
862static int rpcb_dec_getport(struct rpc_rqst *req, struct xdr_stream *xdr,
863 struct rpcbind_args *rpcb)
864{
865 unsigned long port;
866 __be32 *p;
867
868 rpcb->r_port = 0;
869
870 p = xdr_inline_decode(xdr, 4);
871 if (unlikely(p == NULL))
872 return -EIO;
873
874 port = be32_to_cpup(p);
875 dprintk("RPC: %5u PMAP_%s result: %lu\n", req->rq_task->tk_pid,
876 req->rq_task->tk_msg.rpc_proc->p_name, port);
877 if (unlikely(port > USHRT_MAX))
878 return -EIO;
879
880 rpcb->r_port = port;
881 return 0;
882}
883
884static int rpcb_dec_set(struct rpc_rqst *req, struct xdr_stream *xdr,
885 unsigned int *boolp)
886{
887 __be32 *p;
888
889 p = xdr_inline_decode(xdr, 4);
890 if (unlikely(p == NULL))
891 return -EIO;
892
893 *boolp = 0;
894 if (*p != xdr_zero)
895 *boolp = 1;
896
897 dprintk("RPC: %5u RPCB_%s call %s\n",
898 req->rq_task->tk_pid,
899 req->rq_task->tk_msg.rpc_proc->p_name,
900 (*boolp ? "succeeded" : "failed"));
901 return 0;
902}
903
904static void encode_rpcb_string(struct xdr_stream *xdr, const char *string,
905 const u32 maxstrlen)
906{
907 __be32 *p;
908 u32 len;
909
910 len = strlen(string);
911 WARN_ON_ONCE(len > maxstrlen);
912 if (len > maxstrlen)
913 /* truncate and hope for the best */
914 len = maxstrlen;
915 p = xdr_reserve_space(xdr, 4 + len);
916 xdr_encode_opaque(p, string, len);
917}
918
919static void rpcb_enc_getaddr(struct rpc_rqst *req, struct xdr_stream *xdr,
920 const struct rpcbind_args *rpcb)
921{
922 __be32 *p;
923
924 dprintk("RPC: %5u encoding RPCB_%s call (%u, %u, '%s', '%s')\n",
925 req->rq_task->tk_pid,
926 req->rq_task->tk_msg.rpc_proc->p_name,
927 rpcb->r_prog, rpcb->r_vers,
928 rpcb->r_netid, rpcb->r_addr);
929
930 p = xdr_reserve_space(xdr, (RPCB_program_sz + RPCB_version_sz) << 2);
931 *p++ = cpu_to_be32(rpcb->r_prog);
932 *p = cpu_to_be32(rpcb->r_vers);
933
934 encode_rpcb_string(xdr, rpcb->r_netid, RPCBIND_MAXNETIDLEN);
935 encode_rpcb_string(xdr, rpcb->r_addr, RPCBIND_MAXUADDRLEN);
936 encode_rpcb_string(xdr, rpcb->r_owner, RPCB_MAXOWNERLEN);
937}
938
939static int rpcb_dec_getaddr(struct rpc_rqst *req, struct xdr_stream *xdr,
940 struct rpcbind_args *rpcb)
941{
942 struct sockaddr_storage address;
943 struct sockaddr *sap = (struct sockaddr *)&address;
944 __be32 *p;
945 u32 len;
946
947 rpcb->r_port = 0;
948
949 p = xdr_inline_decode(xdr, 4);
950 if (unlikely(p == NULL))
951 goto out_fail;
952 len = be32_to_cpup(p);
953
954 /*
955 * If the returned universal address is a null string,
956 * the requested RPC service was not registered.
957 */
958 if (len == 0) {
959 dprintk("RPC: %5u RPCB reply: program not registered\n",
960 req->rq_task->tk_pid);
961 return 0;
962 }
963
964 if (unlikely(len > RPCBIND_MAXUADDRLEN))
965 goto out_fail;
966
967 p = xdr_inline_decode(xdr, len);
968 if (unlikely(p == NULL))
969 goto out_fail;
970 dprintk("RPC: %5u RPCB_%s reply: %s\n", req->rq_task->tk_pid,
971 req->rq_task->tk_msg.rpc_proc->p_name, (char *)p);
972
973 if (rpc_uaddr2sockaddr(req->rq_xprt->xprt_net, (char *)p, len,
974 sap, sizeof(address)) == 0)
975 goto out_fail;
976 rpcb->r_port = rpc_get_port(sap);
977
978 return 0;
979
980out_fail:
981 dprintk("RPC: %5u malformed RPCB_%s reply\n",
982 req->rq_task->tk_pid,
983 req->rq_task->tk_msg.rpc_proc->p_name);
984 return -EIO;
985}
986
987/*
988 * Not all rpcbind procedures described in RFC 1833 are implemented
989 * since the Linux kernel RPC code requires only these.
990 */
991
992static struct rpc_procinfo rpcb_procedures2[] = {
993 [RPCBPROC_SET] = {
994 .p_proc = RPCBPROC_SET,
995 .p_encode = (kxdreproc_t)rpcb_enc_mapping,
996 .p_decode = (kxdrdproc_t)rpcb_dec_set,
997 .p_arglen = RPCB_mappingargs_sz,
998 .p_replen = RPCB_setres_sz,
999 .p_statidx = RPCBPROC_SET,
1000 .p_timer = 0,
1001 .p_name = "SET",
1002 },
1003 [RPCBPROC_UNSET] = {
1004 .p_proc = RPCBPROC_UNSET,
1005 .p_encode = (kxdreproc_t)rpcb_enc_mapping,
1006 .p_decode = (kxdrdproc_t)rpcb_dec_set,
1007 .p_arglen = RPCB_mappingargs_sz,
1008 .p_replen = RPCB_setres_sz,
1009 .p_statidx = RPCBPROC_UNSET,
1010 .p_timer = 0,
1011 .p_name = "UNSET",
1012 },
1013 [RPCBPROC_GETPORT] = {
1014 .p_proc = RPCBPROC_GETPORT,
1015 .p_encode = (kxdreproc_t)rpcb_enc_mapping,
1016 .p_decode = (kxdrdproc_t)rpcb_dec_getport,
1017 .p_arglen = RPCB_mappingargs_sz,
1018 .p_replen = RPCB_getportres_sz,
1019 .p_statidx = RPCBPROC_GETPORT,
1020 .p_timer = 0,
1021 .p_name = "GETPORT",
1022 },
1023};
1024
1025static struct rpc_procinfo rpcb_procedures3[] = {
1026 [RPCBPROC_SET] = {
1027 .p_proc = RPCBPROC_SET,
1028 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
1029 .p_decode = (kxdrdproc_t)rpcb_dec_set,
1030 .p_arglen = RPCB_getaddrargs_sz,
1031 .p_replen = RPCB_setres_sz,
1032 .p_statidx = RPCBPROC_SET,
1033 .p_timer = 0,
1034 .p_name = "SET",
1035 },
1036 [RPCBPROC_UNSET] = {
1037 .p_proc = RPCBPROC_UNSET,
1038 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
1039 .p_decode = (kxdrdproc_t)rpcb_dec_set,
1040 .p_arglen = RPCB_getaddrargs_sz,
1041 .p_replen = RPCB_setres_sz,
1042 .p_statidx = RPCBPROC_UNSET,
1043 .p_timer = 0,
1044 .p_name = "UNSET",
1045 },
1046 [RPCBPROC_GETADDR] = {
1047 .p_proc = RPCBPROC_GETADDR,
1048 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
1049 .p_decode = (kxdrdproc_t)rpcb_dec_getaddr,
1050 .p_arglen = RPCB_getaddrargs_sz,
1051 .p_replen = RPCB_getaddrres_sz,
1052 .p_statidx = RPCBPROC_GETADDR,
1053 .p_timer = 0,
1054 .p_name = "GETADDR",
1055 },
1056};
1057
1058static struct rpc_procinfo rpcb_procedures4[] = {
1059 [RPCBPROC_SET] = {
1060 .p_proc = RPCBPROC_SET,
1061 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
1062 .p_decode = (kxdrdproc_t)rpcb_dec_set,
1063 .p_arglen = RPCB_getaddrargs_sz,
1064 .p_replen = RPCB_setres_sz,
1065 .p_statidx = RPCBPROC_SET,
1066 .p_timer = 0,
1067 .p_name = "SET",
1068 },
1069 [RPCBPROC_UNSET] = {
1070 .p_proc = RPCBPROC_UNSET,
1071 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
1072 .p_decode = (kxdrdproc_t)rpcb_dec_set,
1073 .p_arglen = RPCB_getaddrargs_sz,
1074 .p_replen = RPCB_setres_sz,
1075 .p_statidx = RPCBPROC_UNSET,
1076 .p_timer = 0,
1077 .p_name = "UNSET",
1078 },
1079 [RPCBPROC_GETADDR] = {
1080 .p_proc = RPCBPROC_GETADDR,
1081 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
1082 .p_decode = (kxdrdproc_t)rpcb_dec_getaddr,
1083 .p_arglen = RPCB_getaddrargs_sz,
1084 .p_replen = RPCB_getaddrres_sz,
1085 .p_statidx = RPCBPROC_GETADDR,
1086 .p_timer = 0,
1087 .p_name = "GETADDR",
1088 },
1089};
1090
1091static const struct rpcb_info rpcb_next_version[] = {
1092 {
1093 .rpc_vers = RPCBVERS_2,
1094 .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT],
1095 },
1096 {
1097 .rpc_proc = NULL,
1098 },
1099};
1100
1101static const struct rpcb_info rpcb_next_version6[] = {
1102 {
1103 .rpc_vers = RPCBVERS_4,
1104 .rpc_proc = &rpcb_procedures4[RPCBPROC_GETADDR],
1105 },
1106 {
1107 .rpc_vers = RPCBVERS_3,
1108 .rpc_proc = &rpcb_procedures3[RPCBPROC_GETADDR],
1109 },
1110 {
1111 .rpc_proc = NULL,
1112 },
1113};
1114
1115static const struct rpc_version rpcb_version2 = {
1116 .number = RPCBVERS_2,
1117 .nrprocs = ARRAY_SIZE(rpcb_procedures2),
1118 .procs = rpcb_procedures2
1119};
1120
1121static const struct rpc_version rpcb_version3 = {
1122 .number = RPCBVERS_3,
1123 .nrprocs = ARRAY_SIZE(rpcb_procedures3),
1124 .procs = rpcb_procedures3
1125};
1126
1127static const struct rpc_version rpcb_version4 = {
1128 .number = RPCBVERS_4,
1129 .nrprocs = ARRAY_SIZE(rpcb_procedures4),
1130 .procs = rpcb_procedures4
1131};
1132
1133static const struct rpc_version *rpcb_version[] = {
1134 NULL,
1135 NULL,
1136 &rpcb_version2,
1137 &rpcb_version3,
1138 &rpcb_version4
1139};
1140
1141static struct rpc_stat rpcb_stats;
1142
1143static const struct rpc_program rpcb_program = {
1144 .name = "rpcbind",
1145 .number = RPCBIND_PROGRAM,
1146 .nrvers = ARRAY_SIZE(rpcb_version),
1147 .version = rpcb_version,
1148 .stats = &rpcb_stats,
1149};
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};