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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/*
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#ifdef RPC_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 *hostname,
359 struct sockaddr *srvaddr, size_t salen,
360 int proto, u32 version)
361{
362 struct rpc_create_args args = {
363 .net = net,
364 .protocol = proto,
365 .address = srvaddr,
366 .addrsize = salen,
367 .servername = hostname,
368 .program = &rpcb_program,
369 .version = version,
370 .authflavor = RPC_AUTH_UNIX,
371 .flags = (RPC_CLNT_CREATE_NOPING |
372 RPC_CLNT_CREATE_NONPRIVPORT),
373 };
374
375 switch (srvaddr->sa_family) {
376 case AF_INET:
377 ((struct sockaddr_in *)srvaddr)->sin_port = htons(RPCBIND_PORT);
378 break;
379 case AF_INET6:
380 ((struct sockaddr_in6 *)srvaddr)->sin6_port = htons(RPCBIND_PORT);
381 break;
382 default:
383 return ERR_PTR(-EAFNOSUPPORT);
384 }
385
386 return rpc_create(&args);
387}
388
389static int rpcb_register_call(struct sunrpc_net *sn, struct rpc_clnt *clnt, struct rpc_message *msg, bool is_set)
390{
391 int flags = RPC_TASK_NOCONNECT;
392 int error, result = 0;
393
394 if (is_set || !sn->rpcb_is_af_local)
395 flags = RPC_TASK_SOFTCONN;
396 msg->rpc_resp = &result;
397
398 error = rpc_call_sync(clnt, msg, flags);
399 if (error < 0) {
400 dprintk("RPC: failed to contact local rpcbind "
401 "server (errno %d).\n", -error);
402 return error;
403 }
404
405 if (!result)
406 return -EACCES;
407 return 0;
408}
409
410/**
411 * rpcb_register - set or unset a port registration with the local rpcbind svc
412 * @net: target network namespace
413 * @prog: RPC program number to bind
414 * @vers: RPC version number to bind
415 * @prot: transport protocol to register
416 * @port: port value to register
417 *
418 * Returns zero if the registration request was dispatched successfully
419 * and the rpcbind daemon returned success. Otherwise, returns an errno
420 * value that reflects the nature of the error (request could not be
421 * dispatched, timed out, or rpcbind returned an error).
422 *
423 * RPC services invoke this function to advertise their contact
424 * information via the system's rpcbind daemon. RPC services
425 * invoke this function once for each [program, version, transport]
426 * tuple they wish to advertise.
427 *
428 * Callers may also unregister RPC services that are no longer
429 * available by setting the passed-in port to zero. This removes
430 * all registered transports for [program, version] from the local
431 * rpcbind database.
432 *
433 * This function uses rpcbind protocol version 2 to contact the
434 * local rpcbind daemon.
435 *
436 * Registration works over both AF_INET and AF_INET6, and services
437 * registered via this function are advertised as available for any
438 * address. If the local rpcbind daemon is listening on AF_INET6,
439 * services registered via this function will be advertised on
440 * IN6ADDR_ANY (ie available for all AF_INET and AF_INET6
441 * addresses).
442 */
443int rpcb_register(struct net *net, u32 prog, u32 vers, int prot, unsigned short port)
444{
445 struct rpcbind_args map = {
446 .r_prog = prog,
447 .r_vers = vers,
448 .r_prot = prot,
449 .r_port = port,
450 };
451 struct rpc_message msg = {
452 .rpc_argp = &map,
453 };
454 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
455 bool is_set = false;
456
457 dprintk("RPC: %sregistering (%u, %u, %d, %u) with local "
458 "rpcbind\n", (port ? "" : "un"),
459 prog, vers, prot, port);
460
461 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_UNSET];
462 if (port != 0) {
463 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_SET];
464 is_set = true;
465 }
466
467 return rpcb_register_call(sn, sn->rpcb_local_clnt, &msg, is_set);
468}
469
470/*
471 * Fill in AF_INET family-specific arguments to register
472 */
473static int rpcb_register_inet4(struct sunrpc_net *sn,
474 const struct sockaddr *sap,
475 struct rpc_message *msg)
476{
477 const struct sockaddr_in *sin = (const struct sockaddr_in *)sap;
478 struct rpcbind_args *map = msg->rpc_argp;
479 unsigned short port = ntohs(sin->sin_port);
480 bool is_set = false;
481 int result;
482
483 map->r_addr = rpc_sockaddr2uaddr(sap, GFP_KERNEL);
484
485 dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with "
486 "local rpcbind\n", (port ? "" : "un"),
487 map->r_prog, map->r_vers,
488 map->r_addr, map->r_netid);
489
490 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
491 if (port != 0) {
492 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
493 is_set = true;
494 }
495
496 result = rpcb_register_call(sn, sn->rpcb_local_clnt4, msg, is_set);
497 kfree(map->r_addr);
498 return result;
499}
500
501/*
502 * Fill in AF_INET6 family-specific arguments to register
503 */
504static int rpcb_register_inet6(struct sunrpc_net *sn,
505 const struct sockaddr *sap,
506 struct rpc_message *msg)
507{
508 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sap;
509 struct rpcbind_args *map = msg->rpc_argp;
510 unsigned short port = ntohs(sin6->sin6_port);
511 bool is_set = false;
512 int result;
513
514 map->r_addr = rpc_sockaddr2uaddr(sap, GFP_KERNEL);
515
516 dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with "
517 "local rpcbind\n", (port ? "" : "un"),
518 map->r_prog, map->r_vers,
519 map->r_addr, map->r_netid);
520
521 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
522 if (port != 0) {
523 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
524 is_set = true;
525 }
526
527 result = rpcb_register_call(sn, sn->rpcb_local_clnt4, msg, is_set);
528 kfree(map->r_addr);
529 return result;
530}
531
532static int rpcb_unregister_all_protofamilies(struct sunrpc_net *sn,
533 struct rpc_message *msg)
534{
535 struct rpcbind_args *map = msg->rpc_argp;
536
537 dprintk("RPC: unregistering [%u, %u, '%s'] with "
538 "local rpcbind\n",
539 map->r_prog, map->r_vers, map->r_netid);
540
541 map->r_addr = "";
542 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
543
544 return rpcb_register_call(sn, sn->rpcb_local_clnt4, msg, false);
545}
546
547/**
548 * rpcb_v4_register - set or unset a port registration with the local rpcbind
549 * @net: target network namespace
550 * @program: RPC program number of service to (un)register
551 * @version: RPC version number of service to (un)register
552 * @address: address family, IP address, and port to (un)register
553 * @netid: netid of transport protocol to (un)register
554 *
555 * Returns zero if the registration request was dispatched successfully
556 * and the rpcbind daemon returned success. Otherwise, returns an errno
557 * value that reflects the nature of the error (request could not be
558 * dispatched, timed out, or rpcbind returned an error).
559 *
560 * RPC services invoke this function to advertise their contact
561 * information via the system's rpcbind daemon. RPC services
562 * invoke this function once for each [program, version, address,
563 * netid] tuple they wish to advertise.
564 *
565 * Callers may also unregister RPC services that are registered at a
566 * specific address by setting the port number in @address to zero.
567 * They may unregister all registered protocol families at once for
568 * a service by passing a NULL @address argument. If @netid is ""
569 * then all netids for [program, version, address] are unregistered.
570 *
571 * This function uses rpcbind protocol version 4 to contact the
572 * local rpcbind daemon. The local rpcbind daemon must support
573 * version 4 of the rpcbind protocol in order for these functions
574 * to register a service successfully.
575 *
576 * Supported netids include "udp" and "tcp" for UDP and TCP over
577 * IPv4, and "udp6" and "tcp6" for UDP and TCP over IPv6,
578 * respectively.
579 *
580 * The contents of @address determine the address family and the
581 * port to be registered. The usual practice is to pass INADDR_ANY
582 * as the raw address, but specifying a non-zero address is also
583 * supported by this API if the caller wishes to advertise an RPC
584 * service on a specific network interface.
585 *
586 * Note that passing in INADDR_ANY does not create the same service
587 * registration as IN6ADDR_ANY. The former advertises an RPC
588 * service on any IPv4 address, but not on IPv6. The latter
589 * advertises the service on all IPv4 and IPv6 addresses.
590 */
591int rpcb_v4_register(struct net *net, const u32 program, const u32 version,
592 const struct sockaddr *address, const char *netid)
593{
594 struct rpcbind_args map = {
595 .r_prog = program,
596 .r_vers = version,
597 .r_netid = netid,
598 .r_owner = RPCB_OWNER_STRING,
599 };
600 struct rpc_message msg = {
601 .rpc_argp = &map,
602 };
603 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
604
605 if (sn->rpcb_local_clnt4 == NULL)
606 return -EPROTONOSUPPORT;
607
608 if (address == NULL)
609 return rpcb_unregister_all_protofamilies(sn, &msg);
610
611 switch (address->sa_family) {
612 case AF_INET:
613 return rpcb_register_inet4(sn, address, &msg);
614 case AF_INET6:
615 return rpcb_register_inet6(sn, address, &msg);
616 }
617
618 return -EAFNOSUPPORT;
619}
620
621static struct rpc_task *rpcb_call_async(struct rpc_clnt *rpcb_clnt, struct rpcbind_args *map, 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 *xprt = rcu_dereference(clnt->cl_xprt);
650
651 while (parent != clnt) {
652 if (rcu_dereference(parent->cl_xprt) != xprt)
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 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 do {
685 clnt = rpcb_find_transport_owner(task->tk_client);
686 xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
687 } while (xprt == NULL);
688 rcu_read_unlock();
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, xprt->servername, sap, salen,
744 xprt->prot, bind_version);
745 if (IS_ERR(rpcb_clnt)) {
746 status = PTR_ERR(rpcb_clnt);
747 dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n",
748 task->tk_pid, __func__, PTR_ERR(rpcb_clnt));
749 goto bailout_nofree;
750 }
751
752 map = kzalloc(sizeof(struct rpcbind_args), GFP_ATOMIC);
753 if (!map) {
754 status = -ENOMEM;
755 dprintk("RPC: %5u %s: no memory available\n",
756 task->tk_pid, __func__);
757 goto bailout_release_client;
758 }
759 map->r_prog = clnt->cl_prog;
760 map->r_vers = clnt->cl_vers;
761 map->r_prot = xprt->prot;
762 map->r_port = 0;
763 map->r_xprt = xprt;
764 map->r_status = -EIO;
765
766 switch (bind_version) {
767 case RPCBVERS_4:
768 case RPCBVERS_3:
769 map->r_netid = xprt->address_strings[RPC_DISPLAY_NETID];
770 map->r_addr = rpc_sockaddr2uaddr(sap, GFP_ATOMIC);
771 map->r_owner = "";
772 break;
773 case RPCBVERS_2:
774 map->r_addr = NULL;
775 break;
776 default:
777 BUG();
778 }
779
780 child = rpcb_call_async(rpcb_clnt, map, proc);
781 rpc_release_client(rpcb_clnt);
782 if (IS_ERR(child)) {
783 /* rpcb_map_release() has freed the arguments */
784 dprintk("RPC: %5u %s: rpc_run_task failed\n",
785 task->tk_pid, __func__);
786 return;
787 }
788
789 xprt->stat.bind_count++;
790 rpc_put_task(child);
791 return;
792
793bailout_release_client:
794 rpc_release_client(rpcb_clnt);
795bailout_nofree:
796 rpcb_wake_rpcbind_waiters(xprt, status);
797 task->tk_status = status;
798 xprt_put(xprt);
799}
800EXPORT_SYMBOL_GPL(rpcb_getport_async);
801
802/*
803 * Rpcbind child task calls this callback via tk_exit.
804 */
805static void rpcb_getport_done(struct rpc_task *child, void *data)
806{
807 struct rpcbind_args *map = data;
808 struct rpc_xprt *xprt = map->r_xprt;
809 int status = child->tk_status;
810
811 /* Garbage reply: retry with a lesser rpcbind version */
812 if (status == -EIO)
813 status = -EPROTONOSUPPORT;
814
815 /* rpcbind server doesn't support this rpcbind protocol version */
816 if (status == -EPROTONOSUPPORT)
817 xprt->bind_index++;
818
819 if (status < 0) {
820 /* rpcbind server not available on remote host? */
821 xprt->ops->set_port(xprt, 0);
822 } else if (map->r_port == 0) {
823 /* Requested RPC service wasn't registered on remote host */
824 xprt->ops->set_port(xprt, 0);
825 status = -EACCES;
826 } else {
827 /* Succeeded */
828 xprt->ops->set_port(xprt, map->r_port);
829 xprt_set_bound(xprt);
830 status = 0;
831 }
832
833 dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n",
834 child->tk_pid, status, map->r_port);
835
836 map->r_status = status;
837}
838
839/*
840 * XDR functions for rpcbind
841 */
842
843static void rpcb_enc_mapping(struct rpc_rqst *req, struct xdr_stream *xdr,
844 const struct rpcbind_args *rpcb)
845{
846 __be32 *p;
847
848 dprintk("RPC: %5u encoding PMAP_%s call (%u, %u, %d, %u)\n",
849 req->rq_task->tk_pid,
850 req->rq_task->tk_msg.rpc_proc->p_name,
851 rpcb->r_prog, rpcb->r_vers, rpcb->r_prot, rpcb->r_port);
852
853 p = xdr_reserve_space(xdr, RPCB_mappingargs_sz << 2);
854 *p++ = cpu_to_be32(rpcb->r_prog);
855 *p++ = cpu_to_be32(rpcb->r_vers);
856 *p++ = cpu_to_be32(rpcb->r_prot);
857 *p = cpu_to_be32(rpcb->r_port);
858}
859
860static int rpcb_dec_getport(struct rpc_rqst *req, struct xdr_stream *xdr,
861 struct rpcbind_args *rpcb)
862{
863 unsigned long port;
864 __be32 *p;
865
866 rpcb->r_port = 0;
867
868 p = xdr_inline_decode(xdr, 4);
869 if (unlikely(p == NULL))
870 return -EIO;
871
872 port = be32_to_cpup(p);
873 dprintk("RPC: %5u PMAP_%s result: %lu\n", req->rq_task->tk_pid,
874 req->rq_task->tk_msg.rpc_proc->p_name, port);
875 if (unlikely(port > USHRT_MAX))
876 return -EIO;
877
878 rpcb->r_port = port;
879 return 0;
880}
881
882static int rpcb_dec_set(struct rpc_rqst *req, struct xdr_stream *xdr,
883 unsigned int *boolp)
884{
885 __be32 *p;
886
887 p = xdr_inline_decode(xdr, 4);
888 if (unlikely(p == NULL))
889 return -EIO;
890
891 *boolp = 0;
892 if (*p != xdr_zero)
893 *boolp = 1;
894
895 dprintk("RPC: %5u RPCB_%s call %s\n",
896 req->rq_task->tk_pid,
897 req->rq_task->tk_msg.rpc_proc->p_name,
898 (*boolp ? "succeeded" : "failed"));
899 return 0;
900}
901
902static void encode_rpcb_string(struct xdr_stream *xdr, const char *string,
903 const u32 maxstrlen)
904{
905 __be32 *p;
906 u32 len;
907
908 len = strlen(string);
909 WARN_ON_ONCE(len > maxstrlen);
910 if (len > maxstrlen)
911 /* truncate and hope for the best */
912 len = maxstrlen;
913 p = xdr_reserve_space(xdr, 4 + len);
914 xdr_encode_opaque(p, string, len);
915}
916
917static void rpcb_enc_getaddr(struct rpc_rqst *req, struct xdr_stream *xdr,
918 const struct rpcbind_args *rpcb)
919{
920 __be32 *p;
921
922 dprintk("RPC: %5u encoding RPCB_%s call (%u, %u, '%s', '%s')\n",
923 req->rq_task->tk_pid,
924 req->rq_task->tk_msg.rpc_proc->p_name,
925 rpcb->r_prog, rpcb->r_vers,
926 rpcb->r_netid, rpcb->r_addr);
927
928 p = xdr_reserve_space(xdr, (RPCB_program_sz + RPCB_version_sz) << 2);
929 *p++ = cpu_to_be32(rpcb->r_prog);
930 *p = cpu_to_be32(rpcb->r_vers);
931
932 encode_rpcb_string(xdr, rpcb->r_netid, RPCBIND_MAXNETIDLEN);
933 encode_rpcb_string(xdr, rpcb->r_addr, RPCBIND_MAXUADDRLEN);
934 encode_rpcb_string(xdr, rpcb->r_owner, RPCB_MAXOWNERLEN);
935}
936
937static int rpcb_dec_getaddr(struct rpc_rqst *req, struct xdr_stream *xdr,
938 struct rpcbind_args *rpcb)
939{
940 struct sockaddr_storage address;
941 struct sockaddr *sap = (struct sockaddr *)&address;
942 __be32 *p;
943 u32 len;
944
945 rpcb->r_port = 0;
946
947 p = xdr_inline_decode(xdr, 4);
948 if (unlikely(p == NULL))
949 goto out_fail;
950 len = be32_to_cpup(p);
951
952 /*
953 * If the returned universal address is a null string,
954 * the requested RPC service was not registered.
955 */
956 if (len == 0) {
957 dprintk("RPC: %5u RPCB reply: program not registered\n",
958 req->rq_task->tk_pid);
959 return 0;
960 }
961
962 if (unlikely(len > RPCBIND_MAXUADDRLEN))
963 goto out_fail;
964
965 p = xdr_inline_decode(xdr, len);
966 if (unlikely(p == NULL))
967 goto out_fail;
968 dprintk("RPC: %5u RPCB_%s reply: %s\n", req->rq_task->tk_pid,
969 req->rq_task->tk_msg.rpc_proc->p_name, (char *)p);
970
971 if (rpc_uaddr2sockaddr(req->rq_xprt->xprt_net, (char *)p, len,
972 sap, sizeof(address)) == 0)
973 goto out_fail;
974 rpcb->r_port = rpc_get_port(sap);
975
976 return 0;
977
978out_fail:
979 dprintk("RPC: %5u malformed RPCB_%s reply\n",
980 req->rq_task->tk_pid,
981 req->rq_task->tk_msg.rpc_proc->p_name);
982 return -EIO;
983}
984
985/*
986 * Not all rpcbind procedures described in RFC 1833 are implemented
987 * since the Linux kernel RPC code requires only these.
988 */
989
990static struct rpc_procinfo rpcb_procedures2[] = {
991 [RPCBPROC_SET] = {
992 .p_proc = RPCBPROC_SET,
993 .p_encode = (kxdreproc_t)rpcb_enc_mapping,
994 .p_decode = (kxdrdproc_t)rpcb_dec_set,
995 .p_arglen = RPCB_mappingargs_sz,
996 .p_replen = RPCB_setres_sz,
997 .p_statidx = RPCBPROC_SET,
998 .p_timer = 0,
999 .p_name = "SET",
1000 },
1001 [RPCBPROC_UNSET] = {
1002 .p_proc = RPCBPROC_UNSET,
1003 .p_encode = (kxdreproc_t)rpcb_enc_mapping,
1004 .p_decode = (kxdrdproc_t)rpcb_dec_set,
1005 .p_arglen = RPCB_mappingargs_sz,
1006 .p_replen = RPCB_setres_sz,
1007 .p_statidx = RPCBPROC_UNSET,
1008 .p_timer = 0,
1009 .p_name = "UNSET",
1010 },
1011 [RPCBPROC_GETPORT] = {
1012 .p_proc = RPCBPROC_GETPORT,
1013 .p_encode = (kxdreproc_t)rpcb_enc_mapping,
1014 .p_decode = (kxdrdproc_t)rpcb_dec_getport,
1015 .p_arglen = RPCB_mappingargs_sz,
1016 .p_replen = RPCB_getportres_sz,
1017 .p_statidx = RPCBPROC_GETPORT,
1018 .p_timer = 0,
1019 .p_name = "GETPORT",
1020 },
1021};
1022
1023static struct rpc_procinfo rpcb_procedures3[] = {
1024 [RPCBPROC_SET] = {
1025 .p_proc = RPCBPROC_SET,
1026 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
1027 .p_decode = (kxdrdproc_t)rpcb_dec_set,
1028 .p_arglen = RPCB_getaddrargs_sz,
1029 .p_replen = RPCB_setres_sz,
1030 .p_statidx = RPCBPROC_SET,
1031 .p_timer = 0,
1032 .p_name = "SET",
1033 },
1034 [RPCBPROC_UNSET] = {
1035 .p_proc = RPCBPROC_UNSET,
1036 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
1037 .p_decode = (kxdrdproc_t)rpcb_dec_set,
1038 .p_arglen = RPCB_getaddrargs_sz,
1039 .p_replen = RPCB_setres_sz,
1040 .p_statidx = RPCBPROC_UNSET,
1041 .p_timer = 0,
1042 .p_name = "UNSET",
1043 },
1044 [RPCBPROC_GETADDR] = {
1045 .p_proc = RPCBPROC_GETADDR,
1046 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
1047 .p_decode = (kxdrdproc_t)rpcb_dec_getaddr,
1048 .p_arglen = RPCB_getaddrargs_sz,
1049 .p_replen = RPCB_getaddrres_sz,
1050 .p_statidx = RPCBPROC_GETADDR,
1051 .p_timer = 0,
1052 .p_name = "GETADDR",
1053 },
1054};
1055
1056static struct rpc_procinfo rpcb_procedures4[] = {
1057 [RPCBPROC_SET] = {
1058 .p_proc = RPCBPROC_SET,
1059 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
1060 .p_decode = (kxdrdproc_t)rpcb_dec_set,
1061 .p_arglen = RPCB_getaddrargs_sz,
1062 .p_replen = RPCB_setres_sz,
1063 .p_statidx = RPCBPROC_SET,
1064 .p_timer = 0,
1065 .p_name = "SET",
1066 },
1067 [RPCBPROC_UNSET] = {
1068 .p_proc = RPCBPROC_UNSET,
1069 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
1070 .p_decode = (kxdrdproc_t)rpcb_dec_set,
1071 .p_arglen = RPCB_getaddrargs_sz,
1072 .p_replen = RPCB_setres_sz,
1073 .p_statidx = RPCBPROC_UNSET,
1074 .p_timer = 0,
1075 .p_name = "UNSET",
1076 },
1077 [RPCBPROC_GETADDR] = {
1078 .p_proc = RPCBPROC_GETADDR,
1079 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
1080 .p_decode = (kxdrdproc_t)rpcb_dec_getaddr,
1081 .p_arglen = RPCB_getaddrargs_sz,
1082 .p_replen = RPCB_getaddrres_sz,
1083 .p_statidx = RPCBPROC_GETADDR,
1084 .p_timer = 0,
1085 .p_name = "GETADDR",
1086 },
1087};
1088
1089static const struct rpcb_info rpcb_next_version[] = {
1090 {
1091 .rpc_vers = RPCBVERS_2,
1092 .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT],
1093 },
1094 {
1095 .rpc_proc = NULL,
1096 },
1097};
1098
1099static const struct rpcb_info rpcb_next_version6[] = {
1100 {
1101 .rpc_vers = RPCBVERS_4,
1102 .rpc_proc = &rpcb_procedures4[RPCBPROC_GETADDR],
1103 },
1104 {
1105 .rpc_vers = RPCBVERS_3,
1106 .rpc_proc = &rpcb_procedures3[RPCBPROC_GETADDR],
1107 },
1108 {
1109 .rpc_proc = NULL,
1110 },
1111};
1112
1113static const struct rpc_version rpcb_version2 = {
1114 .number = RPCBVERS_2,
1115 .nrprocs = ARRAY_SIZE(rpcb_procedures2),
1116 .procs = rpcb_procedures2
1117};
1118
1119static const struct rpc_version rpcb_version3 = {
1120 .number = RPCBVERS_3,
1121 .nrprocs = ARRAY_SIZE(rpcb_procedures3),
1122 .procs = rpcb_procedures3
1123};
1124
1125static const struct rpc_version rpcb_version4 = {
1126 .number = RPCBVERS_4,
1127 .nrprocs = ARRAY_SIZE(rpcb_procedures4),
1128 .procs = rpcb_procedures4
1129};
1130
1131static const struct rpc_version *rpcb_version[] = {
1132 NULL,
1133 NULL,
1134 &rpcb_version2,
1135 &rpcb_version3,
1136 &rpcb_version4
1137};
1138
1139static struct rpc_stat rpcb_stats;
1140
1141static const struct rpc_program rpcb_program = {
1142 .name = "rpcbind",
1143 .number = RPCBIND_PROGRAM,
1144 .nrvers = ARRAY_SIZE(rpcb_version),
1145 .version = rpcb_version,
1146 .stats = &rpcb_stats,
1147};