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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 const struct rpc_procinfo rpcb_procedures2[];
132static const struct rpc_procinfo rpcb_procedures3[];
133static const struct rpc_procinfo rpcb_procedures4[];
134
135struct rpcb_info {
136 u32 rpc_vers;
137 const struct rpc_procinfo *rpc_proc;
138};
139
140static const struct rpcb_info rpcb_next_version[];
141static const struct rpcb_info rpcb_next_version6[];
142
143static const struct rpc_call_ops rpcb_getport_ops = {
144 .rpc_call_done = rpcb_getport_done,
145 .rpc_release = rpcb_map_release,
146};
147
148static void rpcb_wake_rpcbind_waiters(struct rpc_xprt *xprt, int status)
149{
150 xprt_clear_binding(xprt);
151 rpc_wake_up_status(&xprt->binding, status);
152}
153
154static void rpcb_map_release(void *data)
155{
156 struct rpcbind_args *map = data;
157
158 rpcb_wake_rpcbind_waiters(map->r_xprt, map->r_status);
159 xprt_put(map->r_xprt);
160 kfree(map->r_addr);
161 kfree(map);
162}
163
164static int rpcb_get_local(struct net *net)
165{
166 int cnt;
167 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
168
169 spin_lock(&sn->rpcb_clnt_lock);
170 if (sn->rpcb_users)
171 sn->rpcb_users++;
172 cnt = sn->rpcb_users;
173 spin_unlock(&sn->rpcb_clnt_lock);
174
175 return cnt;
176}
177
178void rpcb_put_local(struct net *net)
179{
180 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
181 struct rpc_clnt *clnt = sn->rpcb_local_clnt;
182 struct rpc_clnt *clnt4 = sn->rpcb_local_clnt4;
183 int shutdown = 0;
184
185 spin_lock(&sn->rpcb_clnt_lock);
186 if (sn->rpcb_users) {
187 if (--sn->rpcb_users == 0) {
188 sn->rpcb_local_clnt = NULL;
189 sn->rpcb_local_clnt4 = NULL;
190 }
191 shutdown = !sn->rpcb_users;
192 }
193 spin_unlock(&sn->rpcb_clnt_lock);
194
195 if (shutdown) {
196 /*
197 * cleanup_rpcb_clnt - remove xprtsock's sysctls, unregister
198 */
199 if (clnt4)
200 rpc_shutdown_client(clnt4);
201 if (clnt)
202 rpc_shutdown_client(clnt);
203 }
204}
205
206static void rpcb_set_local(struct net *net, struct rpc_clnt *clnt,
207 struct rpc_clnt *clnt4,
208 bool is_af_local)
209{
210 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
211
212 /* Protected by rpcb_create_local_mutex */
213 sn->rpcb_local_clnt = clnt;
214 sn->rpcb_local_clnt4 = clnt4;
215 sn->rpcb_is_af_local = is_af_local ? 1 : 0;
216 smp_wmb();
217 sn->rpcb_users = 1;
218 dprintk("RPC: created new rpcb local clients (rpcb_local_clnt: "
219 "%p, rpcb_local_clnt4: %p) for net %x%s\n",
220 sn->rpcb_local_clnt, sn->rpcb_local_clnt4,
221 net->ns.inum, (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,
624 struct rpcbind_args *map, const struct rpc_procinfo *proc)
625{
626 struct rpc_message msg = {
627 .rpc_proc = proc,
628 .rpc_argp = map,
629 .rpc_resp = map,
630 };
631 struct rpc_task_setup task_setup_data = {
632 .rpc_client = rpcb_clnt,
633 .rpc_message = &msg,
634 .callback_ops = &rpcb_getport_ops,
635 .callback_data = map,
636 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFTCONN,
637 };
638
639 return rpc_run_task(&task_setup_data);
640}
641
642/*
643 * In the case where rpc clients have been cloned, we want to make
644 * sure that we use the program number/version etc of the actual
645 * owner of the xprt. To do so, we walk back up the tree of parents
646 * to find whoever created the transport and/or whoever has the
647 * autobind flag set.
648 */
649static struct rpc_clnt *rpcb_find_transport_owner(struct rpc_clnt *clnt)
650{
651 struct rpc_clnt *parent = clnt->cl_parent;
652 struct rpc_xprt_switch *xps = rcu_access_pointer(clnt->cl_xpi.xpi_xpswitch);
653
654 while (parent != clnt) {
655 if (rcu_access_pointer(parent->cl_xpi.xpi_xpswitch) != xps)
656 break;
657 if (clnt->cl_autobind)
658 break;
659 clnt = parent;
660 parent = parent->cl_parent;
661 }
662 return clnt;
663}
664
665/**
666 * rpcb_getport_async - obtain the port for a given RPC service on a given host
667 * @task: task that is waiting for portmapper request
668 *
669 * This one can be called for an ongoing RPC request, and can be used in
670 * an async (rpciod) context.
671 */
672void rpcb_getport_async(struct rpc_task *task)
673{
674 struct rpc_clnt *clnt;
675 const struct rpc_procinfo *proc;
676 u32 bind_version;
677 struct rpc_xprt *xprt;
678 struct rpc_clnt *rpcb_clnt;
679 struct rpcbind_args *map;
680 struct rpc_task *child;
681 struct sockaddr_storage addr;
682 struct sockaddr *sap = (struct sockaddr *)&addr;
683 size_t salen;
684 int status;
685
686 rcu_read_lock();
687 clnt = rpcb_find_transport_owner(task->tk_client);
688 rcu_read_unlock();
689 xprt = xprt_get(task->tk_xprt);
690
691 dprintk("RPC: %5u %s(%s, %u, %u, %d)\n",
692 task->tk_pid, __func__,
693 xprt->servername, clnt->cl_prog, clnt->cl_vers, xprt->prot);
694
695 /* Put self on the wait queue to ensure we get notified if
696 * some other task is already attempting to bind the port */
697 rpc_sleep_on(&xprt->binding, task, NULL);
698
699 if (xprt_test_and_set_binding(xprt)) {
700 dprintk("RPC: %5u %s: waiting for another binder\n",
701 task->tk_pid, __func__);
702 xprt_put(xprt);
703 return;
704 }
705
706 /* Someone else may have bound if we slept */
707 if (xprt_bound(xprt)) {
708 status = 0;
709 dprintk("RPC: %5u %s: already bound\n",
710 task->tk_pid, __func__);
711 goto bailout_nofree;
712 }
713
714 /* Parent transport's destination address */
715 salen = rpc_peeraddr(clnt, sap, sizeof(addr));
716
717 /* Don't ever use rpcbind v2 for AF_INET6 requests */
718 switch (sap->sa_family) {
719 case AF_INET:
720 proc = rpcb_next_version[xprt->bind_index].rpc_proc;
721 bind_version = rpcb_next_version[xprt->bind_index].rpc_vers;
722 break;
723 case AF_INET6:
724 proc = rpcb_next_version6[xprt->bind_index].rpc_proc;
725 bind_version = rpcb_next_version6[xprt->bind_index].rpc_vers;
726 break;
727 default:
728 status = -EAFNOSUPPORT;
729 dprintk("RPC: %5u %s: bad address family\n",
730 task->tk_pid, __func__);
731 goto bailout_nofree;
732 }
733 if (proc == NULL) {
734 xprt->bind_index = 0;
735 status = -EPFNOSUPPORT;
736 dprintk("RPC: %5u %s: no more getport versions available\n",
737 task->tk_pid, __func__);
738 goto bailout_nofree;
739 }
740
741 dprintk("RPC: %5u %s: trying rpcbind version %u\n",
742 task->tk_pid, __func__, bind_version);
743
744 rpcb_clnt = rpcb_create(xprt->xprt_net,
745 clnt->cl_nodename,
746 xprt->servername, sap, salen,
747 xprt->prot, bind_version);
748 if (IS_ERR(rpcb_clnt)) {
749 status = PTR_ERR(rpcb_clnt);
750 dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n",
751 task->tk_pid, __func__, PTR_ERR(rpcb_clnt));
752 goto bailout_nofree;
753 }
754
755 map = kzalloc(sizeof(struct rpcbind_args), GFP_ATOMIC);
756 if (!map) {
757 status = -ENOMEM;
758 dprintk("RPC: %5u %s: no memory available\n",
759 task->tk_pid, __func__);
760 goto bailout_release_client;
761 }
762 map->r_prog = clnt->cl_prog;
763 map->r_vers = clnt->cl_vers;
764 map->r_prot = xprt->prot;
765 map->r_port = 0;
766 map->r_xprt = xprt;
767 map->r_status = -EIO;
768
769 switch (bind_version) {
770 case RPCBVERS_4:
771 case RPCBVERS_3:
772 map->r_netid = xprt->address_strings[RPC_DISPLAY_NETID];
773 map->r_addr = rpc_sockaddr2uaddr(sap, GFP_ATOMIC);
774 map->r_owner = "";
775 break;
776 case RPCBVERS_2:
777 map->r_addr = NULL;
778 break;
779 default:
780 BUG();
781 }
782
783 child = rpcb_call_async(rpcb_clnt, map, proc);
784 rpc_release_client(rpcb_clnt);
785 if (IS_ERR(child)) {
786 /* rpcb_map_release() has freed the arguments */
787 dprintk("RPC: %5u %s: rpc_run_task failed\n",
788 task->tk_pid, __func__);
789 return;
790 }
791
792 xprt->stat.bind_count++;
793 rpc_put_task(child);
794 return;
795
796bailout_release_client:
797 rpc_release_client(rpcb_clnt);
798bailout_nofree:
799 rpcb_wake_rpcbind_waiters(xprt, status);
800 task->tk_status = status;
801 xprt_put(xprt);
802}
803EXPORT_SYMBOL_GPL(rpcb_getport_async);
804
805/*
806 * Rpcbind child task calls this callback via tk_exit.
807 */
808static void rpcb_getport_done(struct rpc_task *child, void *data)
809{
810 struct rpcbind_args *map = data;
811 struct rpc_xprt *xprt = map->r_xprt;
812 int status = child->tk_status;
813
814 /* Garbage reply: retry with a lesser rpcbind version */
815 if (status == -EIO)
816 status = -EPROTONOSUPPORT;
817
818 /* rpcbind server doesn't support this rpcbind protocol version */
819 if (status == -EPROTONOSUPPORT)
820 xprt->bind_index++;
821
822 if (status < 0) {
823 /* rpcbind server not available on remote host? */
824 xprt->ops->set_port(xprt, 0);
825 } else if (map->r_port == 0) {
826 /* Requested RPC service wasn't registered on remote host */
827 xprt->ops->set_port(xprt, 0);
828 status = -EACCES;
829 } else {
830 /* Succeeded */
831 xprt->ops->set_port(xprt, map->r_port);
832 xprt_set_bound(xprt);
833 status = 0;
834 }
835
836 dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n",
837 child->tk_pid, status, map->r_port);
838
839 map->r_status = status;
840}
841
842/*
843 * XDR functions for rpcbind
844 */
845
846static void rpcb_enc_mapping(struct rpc_rqst *req, struct xdr_stream *xdr,
847 const void *data)
848{
849 const struct rpcbind_args *rpcb = data;
850 __be32 *p;
851
852 dprintk("RPC: %5u encoding PMAP_%s call (%u, %u, %d, %u)\n",
853 req->rq_task->tk_pid,
854 req->rq_task->tk_msg.rpc_proc->p_name,
855 rpcb->r_prog, rpcb->r_vers, rpcb->r_prot, rpcb->r_port);
856
857 p = xdr_reserve_space(xdr, RPCB_mappingargs_sz << 2);
858 *p++ = cpu_to_be32(rpcb->r_prog);
859 *p++ = cpu_to_be32(rpcb->r_vers);
860 *p++ = cpu_to_be32(rpcb->r_prot);
861 *p = cpu_to_be32(rpcb->r_port);
862}
863
864static int rpcb_dec_getport(struct rpc_rqst *req, struct xdr_stream *xdr,
865 void *data)
866{
867 struct rpcbind_args *rpcb = data;
868 unsigned long port;
869 __be32 *p;
870
871 rpcb->r_port = 0;
872
873 p = xdr_inline_decode(xdr, 4);
874 if (unlikely(p == NULL))
875 return -EIO;
876
877 port = be32_to_cpup(p);
878 dprintk("RPC: %5u PMAP_%s result: %lu\n", req->rq_task->tk_pid,
879 req->rq_task->tk_msg.rpc_proc->p_name, port);
880 if (unlikely(port > USHRT_MAX))
881 return -EIO;
882
883 rpcb->r_port = port;
884 return 0;
885}
886
887static int rpcb_dec_set(struct rpc_rqst *req, struct xdr_stream *xdr,
888 void *data)
889{
890 unsigned int *boolp = data;
891 __be32 *p;
892
893 p = xdr_inline_decode(xdr, 4);
894 if (unlikely(p == NULL))
895 return -EIO;
896
897 *boolp = 0;
898 if (*p != xdr_zero)
899 *boolp = 1;
900
901 dprintk("RPC: %5u RPCB_%s call %s\n",
902 req->rq_task->tk_pid,
903 req->rq_task->tk_msg.rpc_proc->p_name,
904 (*boolp ? "succeeded" : "failed"));
905 return 0;
906}
907
908static void encode_rpcb_string(struct xdr_stream *xdr, const char *string,
909 const u32 maxstrlen)
910{
911 __be32 *p;
912 u32 len;
913
914 len = strlen(string);
915 WARN_ON_ONCE(len > maxstrlen);
916 if (len > maxstrlen)
917 /* truncate and hope for the best */
918 len = maxstrlen;
919 p = xdr_reserve_space(xdr, 4 + len);
920 xdr_encode_opaque(p, string, len);
921}
922
923static void rpcb_enc_getaddr(struct rpc_rqst *req, struct xdr_stream *xdr,
924 const void *data)
925{
926 const struct rpcbind_args *rpcb = data;
927 __be32 *p;
928
929 dprintk("RPC: %5u encoding RPCB_%s call (%u, %u, '%s', '%s')\n",
930 req->rq_task->tk_pid,
931 req->rq_task->tk_msg.rpc_proc->p_name,
932 rpcb->r_prog, rpcb->r_vers,
933 rpcb->r_netid, rpcb->r_addr);
934
935 p = xdr_reserve_space(xdr, (RPCB_program_sz + RPCB_version_sz) << 2);
936 *p++ = cpu_to_be32(rpcb->r_prog);
937 *p = cpu_to_be32(rpcb->r_vers);
938
939 encode_rpcb_string(xdr, rpcb->r_netid, RPCBIND_MAXNETIDLEN);
940 encode_rpcb_string(xdr, rpcb->r_addr, RPCBIND_MAXUADDRLEN);
941 encode_rpcb_string(xdr, rpcb->r_owner, RPCB_MAXOWNERLEN);
942}
943
944static int rpcb_dec_getaddr(struct rpc_rqst *req, struct xdr_stream *xdr,
945 void *data)
946{
947 struct rpcbind_args *rpcb = data;
948 struct sockaddr_storage address;
949 struct sockaddr *sap = (struct sockaddr *)&address;
950 __be32 *p;
951 u32 len;
952
953 rpcb->r_port = 0;
954
955 p = xdr_inline_decode(xdr, 4);
956 if (unlikely(p == NULL))
957 goto out_fail;
958 len = be32_to_cpup(p);
959
960 /*
961 * If the returned universal address is a null string,
962 * the requested RPC service was not registered.
963 */
964 if (len == 0) {
965 dprintk("RPC: %5u RPCB reply: program not registered\n",
966 req->rq_task->tk_pid);
967 return 0;
968 }
969
970 if (unlikely(len > RPCBIND_MAXUADDRLEN))
971 goto out_fail;
972
973 p = xdr_inline_decode(xdr, len);
974 if (unlikely(p == NULL))
975 goto out_fail;
976 dprintk("RPC: %5u RPCB_%s reply: %s\n", req->rq_task->tk_pid,
977 req->rq_task->tk_msg.rpc_proc->p_name, (char *)p);
978
979 if (rpc_uaddr2sockaddr(req->rq_xprt->xprt_net, (char *)p, len,
980 sap, sizeof(address)) == 0)
981 goto out_fail;
982 rpcb->r_port = rpc_get_port(sap);
983
984 return 0;
985
986out_fail:
987 dprintk("RPC: %5u malformed RPCB_%s reply\n",
988 req->rq_task->tk_pid,
989 req->rq_task->tk_msg.rpc_proc->p_name);
990 return -EIO;
991}
992
993/*
994 * Not all rpcbind procedures described in RFC 1833 are implemented
995 * since the Linux kernel RPC code requires only these.
996 */
997
998static const struct rpc_procinfo rpcb_procedures2[] = {
999 [RPCBPROC_SET] = {
1000 .p_proc = RPCBPROC_SET,
1001 .p_encode = rpcb_enc_mapping,
1002 .p_decode = rpcb_dec_set,
1003 .p_arglen = RPCB_mappingargs_sz,
1004 .p_replen = RPCB_setres_sz,
1005 .p_statidx = RPCBPROC_SET,
1006 .p_timer = 0,
1007 .p_name = "SET",
1008 },
1009 [RPCBPROC_UNSET] = {
1010 .p_proc = RPCBPROC_UNSET,
1011 .p_encode = rpcb_enc_mapping,
1012 .p_decode = rpcb_dec_set,
1013 .p_arglen = RPCB_mappingargs_sz,
1014 .p_replen = RPCB_setres_sz,
1015 .p_statidx = RPCBPROC_UNSET,
1016 .p_timer = 0,
1017 .p_name = "UNSET",
1018 },
1019 [RPCBPROC_GETPORT] = {
1020 .p_proc = RPCBPROC_GETPORT,
1021 .p_encode = rpcb_enc_mapping,
1022 .p_decode = rpcb_dec_getport,
1023 .p_arglen = RPCB_mappingargs_sz,
1024 .p_replen = RPCB_getportres_sz,
1025 .p_statidx = RPCBPROC_GETPORT,
1026 .p_timer = 0,
1027 .p_name = "GETPORT",
1028 },
1029};
1030
1031static const struct rpc_procinfo rpcb_procedures3[] = {
1032 [RPCBPROC_SET] = {
1033 .p_proc = RPCBPROC_SET,
1034 .p_encode = rpcb_enc_getaddr,
1035 .p_decode = rpcb_dec_set,
1036 .p_arglen = RPCB_getaddrargs_sz,
1037 .p_replen = RPCB_setres_sz,
1038 .p_statidx = RPCBPROC_SET,
1039 .p_timer = 0,
1040 .p_name = "SET",
1041 },
1042 [RPCBPROC_UNSET] = {
1043 .p_proc = RPCBPROC_UNSET,
1044 .p_encode = rpcb_enc_getaddr,
1045 .p_decode = rpcb_dec_set,
1046 .p_arglen = RPCB_getaddrargs_sz,
1047 .p_replen = RPCB_setres_sz,
1048 .p_statidx = RPCBPROC_UNSET,
1049 .p_timer = 0,
1050 .p_name = "UNSET",
1051 },
1052 [RPCBPROC_GETADDR] = {
1053 .p_proc = RPCBPROC_GETADDR,
1054 .p_encode = rpcb_enc_getaddr,
1055 .p_decode = rpcb_dec_getaddr,
1056 .p_arglen = RPCB_getaddrargs_sz,
1057 .p_replen = RPCB_getaddrres_sz,
1058 .p_statidx = RPCBPROC_GETADDR,
1059 .p_timer = 0,
1060 .p_name = "GETADDR",
1061 },
1062};
1063
1064static const struct rpc_procinfo rpcb_procedures4[] = {
1065 [RPCBPROC_SET] = {
1066 .p_proc = RPCBPROC_SET,
1067 .p_encode = rpcb_enc_getaddr,
1068 .p_decode = rpcb_dec_set,
1069 .p_arglen = RPCB_getaddrargs_sz,
1070 .p_replen = RPCB_setres_sz,
1071 .p_statidx = RPCBPROC_SET,
1072 .p_timer = 0,
1073 .p_name = "SET",
1074 },
1075 [RPCBPROC_UNSET] = {
1076 .p_proc = RPCBPROC_UNSET,
1077 .p_encode = rpcb_enc_getaddr,
1078 .p_decode = rpcb_dec_set,
1079 .p_arglen = RPCB_getaddrargs_sz,
1080 .p_replen = RPCB_setres_sz,
1081 .p_statidx = RPCBPROC_UNSET,
1082 .p_timer = 0,
1083 .p_name = "UNSET",
1084 },
1085 [RPCBPROC_GETADDR] = {
1086 .p_proc = RPCBPROC_GETADDR,
1087 .p_encode = rpcb_enc_getaddr,
1088 .p_decode = rpcb_dec_getaddr,
1089 .p_arglen = RPCB_getaddrargs_sz,
1090 .p_replen = RPCB_getaddrres_sz,
1091 .p_statidx = RPCBPROC_GETADDR,
1092 .p_timer = 0,
1093 .p_name = "GETADDR",
1094 },
1095};
1096
1097static const struct rpcb_info rpcb_next_version[] = {
1098 {
1099 .rpc_vers = RPCBVERS_2,
1100 .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT],
1101 },
1102 {
1103 .rpc_proc = NULL,
1104 },
1105};
1106
1107static const struct rpcb_info rpcb_next_version6[] = {
1108 {
1109 .rpc_vers = RPCBVERS_4,
1110 .rpc_proc = &rpcb_procedures4[RPCBPROC_GETADDR],
1111 },
1112 {
1113 .rpc_vers = RPCBVERS_3,
1114 .rpc_proc = &rpcb_procedures3[RPCBPROC_GETADDR],
1115 },
1116 {
1117 .rpc_proc = NULL,
1118 },
1119};
1120
1121static unsigned int rpcb_version2_counts[ARRAY_SIZE(rpcb_procedures2)];
1122static const struct rpc_version rpcb_version2 = {
1123 .number = RPCBVERS_2,
1124 .nrprocs = ARRAY_SIZE(rpcb_procedures2),
1125 .procs = rpcb_procedures2,
1126 .counts = rpcb_version2_counts,
1127};
1128
1129static unsigned int rpcb_version3_counts[ARRAY_SIZE(rpcb_procedures3)];
1130static const struct rpc_version rpcb_version3 = {
1131 .number = RPCBVERS_3,
1132 .nrprocs = ARRAY_SIZE(rpcb_procedures3),
1133 .procs = rpcb_procedures3,
1134 .counts = rpcb_version3_counts,
1135};
1136
1137static unsigned int rpcb_version4_counts[ARRAY_SIZE(rpcb_procedures4)];
1138static const struct rpc_version rpcb_version4 = {
1139 .number = RPCBVERS_4,
1140 .nrprocs = ARRAY_SIZE(rpcb_procedures4),
1141 .procs = rpcb_procedures4,
1142 .counts = rpcb_version4_counts,
1143};
1144
1145static const struct rpc_version *rpcb_version[] = {
1146 NULL,
1147 NULL,
1148 &rpcb_version2,
1149 &rpcb_version3,
1150 &rpcb_version4
1151};
1152
1153static struct rpc_stat rpcb_stats;
1154
1155static const struct rpc_program rpcb_program = {
1156 .name = "rpcbind",
1157 .number = RPCBIND_PROGRAM,
1158 .nrvers = ARRAY_SIZE(rpcb_version),
1159 .version = rpcb_version,
1160 .stats = &rpcb_stats,
1161};
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * In-kernel rpcbind client supporting versions 2, 3, and 4 of the rpcbind
4 * protocol
5 *
6 * Based on RFC 1833: "Binding Protocols for ONC RPC Version 2" and
7 * RFC 3530: "Network File System (NFS) version 4 Protocol"
8 *
9 * Original: Gilles Quillard, Bull Open Source, 2005 <gilles.quillard@bull.net>
10 * Updated: Chuck Lever, Oracle Corporation, 2007 <chuck.lever@oracle.com>
11 *
12 * Descended from net/sunrpc/pmap_clnt.c,
13 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
14 */
15
16#include <linux/module.h>
17
18#include <linux/types.h>
19#include <linux/socket.h>
20#include <linux/un.h>
21#include <linux/in.h>
22#include <linux/in6.h>
23#include <linux/kernel.h>
24#include <linux/errno.h>
25#include <linux/mutex.h>
26#include <linux/slab.h>
27#include <net/ipv6.h>
28
29#include <linux/sunrpc/clnt.h>
30#include <linux/sunrpc/addr.h>
31#include <linux/sunrpc/sched.h>
32#include <linux/sunrpc/xprtsock.h>
33
34#include "netns.h"
35
36#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
37# define RPCDBG_FACILITY RPCDBG_BIND
38#endif
39
40#define RPCBIND_SOCK_PATHNAME "/var/run/rpcbind.sock"
41
42#define RPCBIND_PROGRAM (100000u)
43#define RPCBIND_PORT (111u)
44
45#define RPCBVERS_2 (2u)
46#define RPCBVERS_3 (3u)
47#define RPCBVERS_4 (4u)
48
49enum {
50 RPCBPROC_NULL,
51 RPCBPROC_SET,
52 RPCBPROC_UNSET,
53 RPCBPROC_GETPORT,
54 RPCBPROC_GETADDR = 3, /* alias for GETPORT */
55 RPCBPROC_DUMP,
56 RPCBPROC_CALLIT,
57 RPCBPROC_BCAST = 5, /* alias for CALLIT */
58 RPCBPROC_GETTIME,
59 RPCBPROC_UADDR2TADDR,
60 RPCBPROC_TADDR2UADDR,
61 RPCBPROC_GETVERSADDR,
62 RPCBPROC_INDIRECT,
63 RPCBPROC_GETADDRLIST,
64 RPCBPROC_GETSTAT,
65};
66
67/*
68 * r_owner
69 *
70 * The "owner" is allowed to unset a service in the rpcbind database.
71 *
72 * For AF_LOCAL SET/UNSET requests, rpcbind treats this string as a
73 * UID which it maps to a local user name via a password lookup.
74 * In all other cases it is ignored.
75 *
76 * For SET/UNSET requests, user space provides a value, even for
77 * network requests, and GETADDR uses an empty string. We follow
78 * those precedents here.
79 */
80#define RPCB_OWNER_STRING "0"
81#define RPCB_MAXOWNERLEN sizeof(RPCB_OWNER_STRING)
82
83/*
84 * XDR data type sizes
85 */
86#define RPCB_program_sz (1)
87#define RPCB_version_sz (1)
88#define RPCB_protocol_sz (1)
89#define RPCB_port_sz (1)
90#define RPCB_boolean_sz (1)
91
92#define RPCB_netid_sz (1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN))
93#define RPCB_addr_sz (1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN))
94#define RPCB_ownerstring_sz (1 + XDR_QUADLEN(RPCB_MAXOWNERLEN))
95
96/*
97 * XDR argument and result sizes
98 */
99#define RPCB_mappingargs_sz (RPCB_program_sz + RPCB_version_sz + \
100 RPCB_protocol_sz + RPCB_port_sz)
101#define RPCB_getaddrargs_sz (RPCB_program_sz + RPCB_version_sz + \
102 RPCB_netid_sz + RPCB_addr_sz + \
103 RPCB_ownerstring_sz)
104
105#define RPCB_getportres_sz RPCB_port_sz
106#define RPCB_setres_sz RPCB_boolean_sz
107
108/*
109 * Note that RFC 1833 does not put any size restrictions on the
110 * address string returned by the remote rpcbind database.
111 */
112#define RPCB_getaddrres_sz RPCB_addr_sz
113
114static void rpcb_getport_done(struct rpc_task *, void *);
115static void rpcb_map_release(void *data);
116static const struct rpc_program rpcb_program;
117
118struct rpcbind_args {
119 struct rpc_xprt * r_xprt;
120
121 u32 r_prog;
122 u32 r_vers;
123 u32 r_prot;
124 unsigned short r_port;
125 const char * r_netid;
126 const char * r_addr;
127 const char * r_owner;
128
129 int r_status;
130};
131
132static const struct rpc_procinfo rpcb_procedures2[];
133static const struct rpc_procinfo rpcb_procedures3[];
134static const struct rpc_procinfo rpcb_procedures4[];
135
136struct rpcb_info {
137 u32 rpc_vers;
138 const struct rpc_procinfo *rpc_proc;
139};
140
141static const struct rpcb_info rpcb_next_version[];
142static const struct rpcb_info rpcb_next_version6[];
143
144static const struct rpc_call_ops rpcb_getport_ops = {
145 .rpc_call_done = rpcb_getport_done,
146 .rpc_release = rpcb_map_release,
147};
148
149static void rpcb_wake_rpcbind_waiters(struct rpc_xprt *xprt, int status)
150{
151 xprt_clear_binding(xprt);
152 rpc_wake_up_status(&xprt->binding, status);
153}
154
155static void rpcb_map_release(void *data)
156{
157 struct rpcbind_args *map = data;
158
159 rpcb_wake_rpcbind_waiters(map->r_xprt, map->r_status);
160 xprt_put(map->r_xprt);
161 kfree(map->r_addr);
162 kfree(map);
163}
164
165static int rpcb_get_local(struct net *net)
166{
167 int cnt;
168 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
169
170 spin_lock(&sn->rpcb_clnt_lock);
171 if (sn->rpcb_users)
172 sn->rpcb_users++;
173 cnt = sn->rpcb_users;
174 spin_unlock(&sn->rpcb_clnt_lock);
175
176 return cnt;
177}
178
179void rpcb_put_local(struct net *net)
180{
181 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
182 struct rpc_clnt *clnt = sn->rpcb_local_clnt;
183 struct rpc_clnt *clnt4 = sn->rpcb_local_clnt4;
184 int shutdown = 0;
185
186 spin_lock(&sn->rpcb_clnt_lock);
187 if (sn->rpcb_users) {
188 if (--sn->rpcb_users == 0) {
189 sn->rpcb_local_clnt = NULL;
190 sn->rpcb_local_clnt4 = NULL;
191 }
192 shutdown = !sn->rpcb_users;
193 }
194 spin_unlock(&sn->rpcb_clnt_lock);
195
196 if (shutdown) {
197 /*
198 * cleanup_rpcb_clnt - remove xprtsock's sysctls, unregister
199 */
200 if (clnt4)
201 rpc_shutdown_client(clnt4);
202 if (clnt)
203 rpc_shutdown_client(clnt);
204 }
205}
206
207static void rpcb_set_local(struct net *net, struct rpc_clnt *clnt,
208 struct rpc_clnt *clnt4,
209 bool is_af_local)
210{
211 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
212
213 /* Protected by rpcb_create_local_mutex */
214 sn->rpcb_local_clnt = clnt;
215 sn->rpcb_local_clnt4 = clnt4;
216 sn->rpcb_is_af_local = is_af_local ? 1 : 0;
217 smp_wmb();
218 sn->rpcb_users = 1;
219 dprintk("RPC: created new rpcb local clients (rpcb_local_clnt: "
220 "%p, rpcb_local_clnt4: %p) for net %x%s\n",
221 sn->rpcb_local_clnt, sn->rpcb_local_clnt4,
222 net->ns.inum, (net == &init_net) ? " (init_net)" : "");
223}
224
225/*
226 * Returns zero on success, otherwise a negative errno value
227 * is returned.
228 */
229static int rpcb_create_local_unix(struct net *net)
230{
231 static const struct sockaddr_un rpcb_localaddr_rpcbind = {
232 .sun_family = AF_LOCAL,
233 .sun_path = RPCBIND_SOCK_PATHNAME,
234 };
235 struct rpc_create_args args = {
236 .net = net,
237 .protocol = XPRT_TRANSPORT_LOCAL,
238 .address = (struct sockaddr *)&rpcb_localaddr_rpcbind,
239 .addrsize = sizeof(rpcb_localaddr_rpcbind),
240 .servername = "localhost",
241 .program = &rpcb_program,
242 .version = RPCBVERS_2,
243 .authflavor = RPC_AUTH_NULL,
244 .cred = current_cred(),
245 /*
246 * We turn off the idle timeout to prevent the kernel
247 * from automatically disconnecting the socket.
248 * Otherwise, we'd have to cache the mount namespace
249 * of the caller and somehow pass that to the socket
250 * reconnect code.
251 */
252 .flags = RPC_CLNT_CREATE_NO_IDLE_TIMEOUT,
253 };
254 struct rpc_clnt *clnt, *clnt4;
255 int result = 0;
256
257 /*
258 * Because we requested an RPC PING at transport creation time,
259 * this works only if the user space portmapper is rpcbind, and
260 * it's listening on AF_LOCAL on the named socket.
261 */
262 clnt = rpc_create(&args);
263 if (IS_ERR(clnt)) {
264 dprintk("RPC: failed to create AF_LOCAL rpcbind "
265 "client (errno %ld).\n", PTR_ERR(clnt));
266 result = PTR_ERR(clnt);
267 goto out;
268 }
269
270 clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4);
271 if (IS_ERR(clnt4)) {
272 dprintk("RPC: failed to bind second program to "
273 "rpcbind v4 client (errno %ld).\n",
274 PTR_ERR(clnt4));
275 clnt4 = NULL;
276 }
277
278 rpcb_set_local(net, clnt, clnt4, true);
279
280out:
281 return result;
282}
283
284/*
285 * Returns zero on success, otherwise a negative errno value
286 * is returned.
287 */
288static int rpcb_create_local_net(struct net *net)
289{
290 static const struct sockaddr_in rpcb_inaddr_loopback = {
291 .sin_family = AF_INET,
292 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
293 .sin_port = htons(RPCBIND_PORT),
294 };
295 struct rpc_create_args args = {
296 .net = net,
297 .protocol = XPRT_TRANSPORT_TCP,
298 .address = (struct sockaddr *)&rpcb_inaddr_loopback,
299 .addrsize = sizeof(rpcb_inaddr_loopback),
300 .servername = "localhost",
301 .program = &rpcb_program,
302 .version = RPCBVERS_2,
303 .authflavor = RPC_AUTH_UNIX,
304 .cred = current_cred(),
305 .flags = RPC_CLNT_CREATE_NOPING,
306 };
307 struct rpc_clnt *clnt, *clnt4;
308 int result = 0;
309
310 clnt = rpc_create(&args);
311 if (IS_ERR(clnt)) {
312 dprintk("RPC: failed to create local rpcbind "
313 "client (errno %ld).\n", PTR_ERR(clnt));
314 result = PTR_ERR(clnt);
315 goto out;
316 }
317
318 /*
319 * This results in an RPC ping. On systems running portmapper,
320 * the v4 ping will fail. Proceed anyway, but disallow rpcb
321 * v4 upcalls.
322 */
323 clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4);
324 if (IS_ERR(clnt4)) {
325 dprintk("RPC: failed to bind second program to "
326 "rpcbind v4 client (errno %ld).\n",
327 PTR_ERR(clnt4));
328 clnt4 = NULL;
329 }
330
331 rpcb_set_local(net, clnt, clnt4, false);
332
333out:
334 return result;
335}
336
337/*
338 * Returns zero on success, otherwise a negative errno value
339 * is returned.
340 */
341int rpcb_create_local(struct net *net)
342{
343 static DEFINE_MUTEX(rpcb_create_local_mutex);
344 int result = 0;
345
346 if (rpcb_get_local(net))
347 return result;
348
349 mutex_lock(&rpcb_create_local_mutex);
350 if (rpcb_get_local(net))
351 goto out;
352
353 if (rpcb_create_local_unix(net) != 0)
354 result = rpcb_create_local_net(net);
355
356out:
357 mutex_unlock(&rpcb_create_local_mutex);
358 return result;
359}
360
361static struct rpc_clnt *rpcb_create(struct net *net, const char *nodename,
362 const char *hostname,
363 struct sockaddr *srvaddr, size_t salen,
364 int proto, u32 version,
365 const struct cred *cred)
366{
367 struct rpc_create_args args = {
368 .net = net,
369 .protocol = proto,
370 .address = srvaddr,
371 .addrsize = salen,
372 .servername = hostname,
373 .nodename = nodename,
374 .program = &rpcb_program,
375 .version = version,
376 .authflavor = RPC_AUTH_UNIX,
377 .cred = cred,
378 .flags = (RPC_CLNT_CREATE_NOPING |
379 RPC_CLNT_CREATE_NONPRIVPORT),
380 };
381
382 switch (srvaddr->sa_family) {
383 case AF_INET:
384 ((struct sockaddr_in *)srvaddr)->sin_port = htons(RPCBIND_PORT);
385 break;
386 case AF_INET6:
387 ((struct sockaddr_in6 *)srvaddr)->sin6_port = htons(RPCBIND_PORT);
388 break;
389 default:
390 return ERR_PTR(-EAFNOSUPPORT);
391 }
392
393 return rpc_create(&args);
394}
395
396static int rpcb_register_call(struct sunrpc_net *sn, struct rpc_clnt *clnt, struct rpc_message *msg, bool is_set)
397{
398 int flags = RPC_TASK_NOCONNECT;
399 int error, result = 0;
400
401 if (is_set || !sn->rpcb_is_af_local)
402 flags = RPC_TASK_SOFTCONN;
403 msg->rpc_resp = &result;
404
405 error = rpc_call_sync(clnt, msg, flags);
406 if (error < 0) {
407 dprintk("RPC: failed to contact local rpcbind "
408 "server (errno %d).\n", -error);
409 return error;
410 }
411
412 if (!result)
413 return -EACCES;
414 return 0;
415}
416
417/**
418 * rpcb_register - set or unset a port registration with the local rpcbind svc
419 * @net: target network namespace
420 * @prog: RPC program number to bind
421 * @vers: RPC version number to bind
422 * @prot: transport protocol to register
423 * @port: port value to register
424 *
425 * Returns zero if the registration request was dispatched successfully
426 * and the rpcbind daemon returned success. Otherwise, returns an errno
427 * value that reflects the nature of the error (request could not be
428 * dispatched, timed out, or rpcbind returned an error).
429 *
430 * RPC services invoke this function to advertise their contact
431 * information via the system's rpcbind daemon. RPC services
432 * invoke this function once for each [program, version, transport]
433 * tuple they wish to advertise.
434 *
435 * Callers may also unregister RPC services that are no longer
436 * available by setting the passed-in port to zero. This removes
437 * all registered transports for [program, version] from the local
438 * rpcbind database.
439 *
440 * This function uses rpcbind protocol version 2 to contact the
441 * local rpcbind daemon.
442 *
443 * Registration works over both AF_INET and AF_INET6, and services
444 * registered via this function are advertised as available for any
445 * address. If the local rpcbind daemon is listening on AF_INET6,
446 * services registered via this function will be advertised on
447 * IN6ADDR_ANY (ie available for all AF_INET and AF_INET6
448 * addresses).
449 */
450int rpcb_register(struct net *net, u32 prog, u32 vers, int prot, unsigned short port)
451{
452 struct rpcbind_args map = {
453 .r_prog = prog,
454 .r_vers = vers,
455 .r_prot = prot,
456 .r_port = port,
457 };
458 struct rpc_message msg = {
459 .rpc_argp = &map,
460 };
461 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
462 bool is_set = false;
463
464 dprintk("RPC: %sregistering (%u, %u, %d, %u) with local "
465 "rpcbind\n", (port ? "" : "un"),
466 prog, vers, prot, port);
467
468 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_UNSET];
469 if (port != 0) {
470 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_SET];
471 is_set = true;
472 }
473
474 return rpcb_register_call(sn, sn->rpcb_local_clnt, &msg, is_set);
475}
476
477/*
478 * Fill in AF_INET family-specific arguments to register
479 */
480static int rpcb_register_inet4(struct sunrpc_net *sn,
481 const struct sockaddr *sap,
482 struct rpc_message *msg)
483{
484 const struct sockaddr_in *sin = (const struct sockaddr_in *)sap;
485 struct rpcbind_args *map = msg->rpc_argp;
486 unsigned short port = ntohs(sin->sin_port);
487 bool is_set = false;
488 int result;
489
490 map->r_addr = rpc_sockaddr2uaddr(sap, GFP_KERNEL);
491
492 dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with "
493 "local rpcbind\n", (port ? "" : "un"),
494 map->r_prog, map->r_vers,
495 map->r_addr, map->r_netid);
496
497 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
498 if (port != 0) {
499 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
500 is_set = true;
501 }
502
503 result = rpcb_register_call(sn, sn->rpcb_local_clnt4, msg, is_set);
504 kfree(map->r_addr);
505 return result;
506}
507
508/*
509 * Fill in AF_INET6 family-specific arguments to register
510 */
511static int rpcb_register_inet6(struct sunrpc_net *sn,
512 const struct sockaddr *sap,
513 struct rpc_message *msg)
514{
515 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sap;
516 struct rpcbind_args *map = msg->rpc_argp;
517 unsigned short port = ntohs(sin6->sin6_port);
518 bool is_set = false;
519 int result;
520
521 map->r_addr = rpc_sockaddr2uaddr(sap, GFP_KERNEL);
522
523 dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with "
524 "local rpcbind\n", (port ? "" : "un"),
525 map->r_prog, map->r_vers,
526 map->r_addr, map->r_netid);
527
528 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
529 if (port != 0) {
530 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
531 is_set = true;
532 }
533
534 result = rpcb_register_call(sn, sn->rpcb_local_clnt4, msg, is_set);
535 kfree(map->r_addr);
536 return result;
537}
538
539static int rpcb_unregister_all_protofamilies(struct sunrpc_net *sn,
540 struct rpc_message *msg)
541{
542 struct rpcbind_args *map = msg->rpc_argp;
543
544 dprintk("RPC: unregistering [%u, %u, '%s'] with "
545 "local rpcbind\n",
546 map->r_prog, map->r_vers, map->r_netid);
547
548 map->r_addr = "";
549 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
550
551 return rpcb_register_call(sn, sn->rpcb_local_clnt4, msg, false);
552}
553
554/**
555 * rpcb_v4_register - set or unset a port registration with the local rpcbind
556 * @net: target network namespace
557 * @program: RPC program number of service to (un)register
558 * @version: RPC version number of service to (un)register
559 * @address: address family, IP address, and port to (un)register
560 * @netid: netid of transport protocol to (un)register
561 *
562 * Returns zero if the registration request was dispatched successfully
563 * and the rpcbind daemon returned success. Otherwise, returns an errno
564 * value that reflects the nature of the error (request could not be
565 * dispatched, timed out, or rpcbind returned an error).
566 *
567 * RPC services invoke this function to advertise their contact
568 * information via the system's rpcbind daemon. RPC services
569 * invoke this function once for each [program, version, address,
570 * netid] tuple they wish to advertise.
571 *
572 * Callers may also unregister RPC services that are registered at a
573 * specific address by setting the port number in @address to zero.
574 * They may unregister all registered protocol families at once for
575 * a service by passing a NULL @address argument. If @netid is ""
576 * then all netids for [program, version, address] are unregistered.
577 *
578 * This function uses rpcbind protocol version 4 to contact the
579 * local rpcbind daemon. The local rpcbind daemon must support
580 * version 4 of the rpcbind protocol in order for these functions
581 * to register a service successfully.
582 *
583 * Supported netids include "udp" and "tcp" for UDP and TCP over
584 * IPv4, and "udp6" and "tcp6" for UDP and TCP over IPv6,
585 * respectively.
586 *
587 * The contents of @address determine the address family and the
588 * port to be registered. The usual practice is to pass INADDR_ANY
589 * as the raw address, but specifying a non-zero address is also
590 * supported by this API if the caller wishes to advertise an RPC
591 * service on a specific network interface.
592 *
593 * Note that passing in INADDR_ANY does not create the same service
594 * registration as IN6ADDR_ANY. The former advertises an RPC
595 * service on any IPv4 address, but not on IPv6. The latter
596 * advertises the service on all IPv4 and IPv6 addresses.
597 */
598int rpcb_v4_register(struct net *net, const u32 program, const u32 version,
599 const struct sockaddr *address, const char *netid)
600{
601 struct rpcbind_args map = {
602 .r_prog = program,
603 .r_vers = version,
604 .r_netid = netid,
605 .r_owner = RPCB_OWNER_STRING,
606 };
607 struct rpc_message msg = {
608 .rpc_argp = &map,
609 };
610 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
611
612 if (sn->rpcb_local_clnt4 == NULL)
613 return -EPROTONOSUPPORT;
614
615 if (address == NULL)
616 return rpcb_unregister_all_protofamilies(sn, &msg);
617
618 switch (address->sa_family) {
619 case AF_INET:
620 return rpcb_register_inet4(sn, address, &msg);
621 case AF_INET6:
622 return rpcb_register_inet6(sn, address, &msg);
623 }
624
625 return -EAFNOSUPPORT;
626}
627
628static struct rpc_task *rpcb_call_async(struct rpc_clnt *rpcb_clnt,
629 struct rpcbind_args *map, const struct rpc_procinfo *proc)
630{
631 struct rpc_message msg = {
632 .rpc_proc = proc,
633 .rpc_argp = map,
634 .rpc_resp = map,
635 };
636 struct rpc_task_setup task_setup_data = {
637 .rpc_client = rpcb_clnt,
638 .rpc_message = &msg,
639 .callback_ops = &rpcb_getport_ops,
640 .callback_data = map,
641 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFTCONN,
642 };
643
644 return rpc_run_task(&task_setup_data);
645}
646
647/*
648 * In the case where rpc clients have been cloned, we want to make
649 * sure that we use the program number/version etc of the actual
650 * owner of the xprt. To do so, we walk back up the tree of parents
651 * to find whoever created the transport and/or whoever has the
652 * autobind flag set.
653 */
654static struct rpc_clnt *rpcb_find_transport_owner(struct rpc_clnt *clnt)
655{
656 struct rpc_clnt *parent = clnt->cl_parent;
657 struct rpc_xprt_switch *xps = rcu_access_pointer(clnt->cl_xpi.xpi_xpswitch);
658
659 while (parent != clnt) {
660 if (rcu_access_pointer(parent->cl_xpi.xpi_xpswitch) != xps)
661 break;
662 if (clnt->cl_autobind)
663 break;
664 clnt = parent;
665 parent = parent->cl_parent;
666 }
667 return clnt;
668}
669
670/**
671 * rpcb_getport_async - obtain the port for a given RPC service on a given host
672 * @task: task that is waiting for portmapper request
673 *
674 * This one can be called for an ongoing RPC request, and can be used in
675 * an async (rpciod) context.
676 */
677void rpcb_getport_async(struct rpc_task *task)
678{
679 struct rpc_clnt *clnt;
680 const struct rpc_procinfo *proc;
681 u32 bind_version;
682 struct rpc_xprt *xprt;
683 struct rpc_clnt *rpcb_clnt;
684 struct rpcbind_args *map;
685 struct rpc_task *child;
686 struct sockaddr_storage addr;
687 struct sockaddr *sap = (struct sockaddr *)&addr;
688 size_t salen;
689 int status;
690
691 rcu_read_lock();
692 clnt = rpcb_find_transport_owner(task->tk_client);
693 rcu_read_unlock();
694 xprt = xprt_get(task->tk_xprt);
695
696 dprintk("RPC: %5u %s(%s, %u, %u, %d)\n",
697 task->tk_pid, __func__,
698 xprt->servername, clnt->cl_prog, clnt->cl_vers, xprt->prot);
699
700 /* Put self on the wait queue to ensure we get notified if
701 * some other task is already attempting to bind the port */
702 rpc_sleep_on_timeout(&xprt->binding, task,
703 NULL, jiffies + xprt->bind_timeout);
704
705 if (xprt_test_and_set_binding(xprt)) {
706 dprintk("RPC: %5u %s: waiting for another binder\n",
707 task->tk_pid, __func__);
708 xprt_put(xprt);
709 return;
710 }
711
712 /* Someone else may have bound if we slept */
713 if (xprt_bound(xprt)) {
714 status = 0;
715 dprintk("RPC: %5u %s: already bound\n",
716 task->tk_pid, __func__);
717 goto bailout_nofree;
718 }
719
720 /* Parent transport's destination address */
721 salen = rpc_peeraddr(clnt, sap, sizeof(addr));
722
723 /* Don't ever use rpcbind v2 for AF_INET6 requests */
724 switch (sap->sa_family) {
725 case AF_INET:
726 proc = rpcb_next_version[xprt->bind_index].rpc_proc;
727 bind_version = rpcb_next_version[xprt->bind_index].rpc_vers;
728 break;
729 case AF_INET6:
730 proc = rpcb_next_version6[xprt->bind_index].rpc_proc;
731 bind_version = rpcb_next_version6[xprt->bind_index].rpc_vers;
732 break;
733 default:
734 status = -EAFNOSUPPORT;
735 dprintk("RPC: %5u %s: bad address family\n",
736 task->tk_pid, __func__);
737 goto bailout_nofree;
738 }
739 if (proc == NULL) {
740 xprt->bind_index = 0;
741 status = -EPFNOSUPPORT;
742 dprintk("RPC: %5u %s: no more getport versions available\n",
743 task->tk_pid, __func__);
744 goto bailout_nofree;
745 }
746
747 dprintk("RPC: %5u %s: trying rpcbind version %u\n",
748 task->tk_pid, __func__, bind_version);
749
750 rpcb_clnt = rpcb_create(xprt->xprt_net,
751 clnt->cl_nodename,
752 xprt->servername, sap, salen,
753 xprt->prot, bind_version,
754 clnt->cl_cred);
755 if (IS_ERR(rpcb_clnt)) {
756 status = PTR_ERR(rpcb_clnt);
757 dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n",
758 task->tk_pid, __func__, PTR_ERR(rpcb_clnt));
759 goto bailout_nofree;
760 }
761
762 map = kzalloc(sizeof(struct rpcbind_args), GFP_NOFS);
763 if (!map) {
764 status = -ENOMEM;
765 dprintk("RPC: %5u %s: no memory available\n",
766 task->tk_pid, __func__);
767 goto bailout_release_client;
768 }
769 map->r_prog = clnt->cl_prog;
770 map->r_vers = clnt->cl_vers;
771 map->r_prot = xprt->prot;
772 map->r_port = 0;
773 map->r_xprt = xprt;
774 map->r_status = -EIO;
775
776 switch (bind_version) {
777 case RPCBVERS_4:
778 case RPCBVERS_3:
779 map->r_netid = xprt->address_strings[RPC_DISPLAY_NETID];
780 map->r_addr = rpc_sockaddr2uaddr(sap, GFP_NOFS);
781 if (!map->r_addr) {
782 status = -ENOMEM;
783 dprintk("RPC: %5u %s: no memory available\n",
784 task->tk_pid, __func__);
785 goto bailout_free_args;
786 }
787 map->r_owner = "";
788 break;
789 case RPCBVERS_2:
790 map->r_addr = NULL;
791 break;
792 default:
793 BUG();
794 }
795
796 child = rpcb_call_async(rpcb_clnt, map, proc);
797 rpc_release_client(rpcb_clnt);
798
799 xprt->stat.bind_count++;
800 rpc_put_task(child);
801 return;
802
803bailout_free_args:
804 kfree(map);
805bailout_release_client:
806 rpc_release_client(rpcb_clnt);
807bailout_nofree:
808 rpcb_wake_rpcbind_waiters(xprt, status);
809 task->tk_status = status;
810 xprt_put(xprt);
811}
812EXPORT_SYMBOL_GPL(rpcb_getport_async);
813
814/*
815 * Rpcbind child task calls this callback via tk_exit.
816 */
817static void rpcb_getport_done(struct rpc_task *child, void *data)
818{
819 struct rpcbind_args *map = data;
820 struct rpc_xprt *xprt = map->r_xprt;
821 int status = child->tk_status;
822
823 /* Garbage reply: retry with a lesser rpcbind version */
824 if (status == -EIO)
825 status = -EPROTONOSUPPORT;
826
827 /* rpcbind server doesn't support this rpcbind protocol version */
828 if (status == -EPROTONOSUPPORT)
829 xprt->bind_index++;
830
831 if (status < 0) {
832 /* rpcbind server not available on remote host? */
833 xprt->ops->set_port(xprt, 0);
834 } else if (map->r_port == 0) {
835 /* Requested RPC service wasn't registered on remote host */
836 xprt->ops->set_port(xprt, 0);
837 status = -EACCES;
838 } else {
839 /* Succeeded */
840 xprt->ops->set_port(xprt, map->r_port);
841 xprt_set_bound(xprt);
842 status = 0;
843 }
844
845 dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n",
846 child->tk_pid, status, map->r_port);
847
848 map->r_status = status;
849}
850
851/*
852 * XDR functions for rpcbind
853 */
854
855static void rpcb_enc_mapping(struct rpc_rqst *req, struct xdr_stream *xdr,
856 const void *data)
857{
858 const struct rpcbind_args *rpcb = data;
859 __be32 *p;
860
861 dprintk("RPC: %5u encoding PMAP_%s call (%u, %u, %d, %u)\n",
862 req->rq_task->tk_pid,
863 req->rq_task->tk_msg.rpc_proc->p_name,
864 rpcb->r_prog, rpcb->r_vers, rpcb->r_prot, rpcb->r_port);
865
866 p = xdr_reserve_space(xdr, RPCB_mappingargs_sz << 2);
867 *p++ = cpu_to_be32(rpcb->r_prog);
868 *p++ = cpu_to_be32(rpcb->r_vers);
869 *p++ = cpu_to_be32(rpcb->r_prot);
870 *p = cpu_to_be32(rpcb->r_port);
871}
872
873static int rpcb_dec_getport(struct rpc_rqst *req, struct xdr_stream *xdr,
874 void *data)
875{
876 struct rpcbind_args *rpcb = data;
877 unsigned long port;
878 __be32 *p;
879
880 rpcb->r_port = 0;
881
882 p = xdr_inline_decode(xdr, 4);
883 if (unlikely(p == NULL))
884 return -EIO;
885
886 port = be32_to_cpup(p);
887 dprintk("RPC: %5u PMAP_%s result: %lu\n", req->rq_task->tk_pid,
888 req->rq_task->tk_msg.rpc_proc->p_name, port);
889 if (unlikely(port > USHRT_MAX))
890 return -EIO;
891
892 rpcb->r_port = port;
893 return 0;
894}
895
896static int rpcb_dec_set(struct rpc_rqst *req, struct xdr_stream *xdr,
897 void *data)
898{
899 unsigned int *boolp = data;
900 __be32 *p;
901
902 p = xdr_inline_decode(xdr, 4);
903 if (unlikely(p == NULL))
904 return -EIO;
905
906 *boolp = 0;
907 if (*p != xdr_zero)
908 *boolp = 1;
909
910 dprintk("RPC: %5u RPCB_%s call %s\n",
911 req->rq_task->tk_pid,
912 req->rq_task->tk_msg.rpc_proc->p_name,
913 (*boolp ? "succeeded" : "failed"));
914 return 0;
915}
916
917static void encode_rpcb_string(struct xdr_stream *xdr, const char *string,
918 const u32 maxstrlen)
919{
920 __be32 *p;
921 u32 len;
922
923 len = strlen(string);
924 WARN_ON_ONCE(len > maxstrlen);
925 if (len > maxstrlen)
926 /* truncate and hope for the best */
927 len = maxstrlen;
928 p = xdr_reserve_space(xdr, 4 + len);
929 xdr_encode_opaque(p, string, len);
930}
931
932static void rpcb_enc_getaddr(struct rpc_rqst *req, struct xdr_stream *xdr,
933 const void *data)
934{
935 const struct rpcbind_args *rpcb = data;
936 __be32 *p;
937
938 dprintk("RPC: %5u encoding RPCB_%s call (%u, %u, '%s', '%s')\n",
939 req->rq_task->tk_pid,
940 req->rq_task->tk_msg.rpc_proc->p_name,
941 rpcb->r_prog, rpcb->r_vers,
942 rpcb->r_netid, rpcb->r_addr);
943
944 p = xdr_reserve_space(xdr, (RPCB_program_sz + RPCB_version_sz) << 2);
945 *p++ = cpu_to_be32(rpcb->r_prog);
946 *p = cpu_to_be32(rpcb->r_vers);
947
948 encode_rpcb_string(xdr, rpcb->r_netid, RPCBIND_MAXNETIDLEN);
949 encode_rpcb_string(xdr, rpcb->r_addr, RPCBIND_MAXUADDRLEN);
950 encode_rpcb_string(xdr, rpcb->r_owner, RPCB_MAXOWNERLEN);
951}
952
953static int rpcb_dec_getaddr(struct rpc_rqst *req, struct xdr_stream *xdr,
954 void *data)
955{
956 struct rpcbind_args *rpcb = data;
957 struct sockaddr_storage address;
958 struct sockaddr *sap = (struct sockaddr *)&address;
959 __be32 *p;
960 u32 len;
961
962 rpcb->r_port = 0;
963
964 p = xdr_inline_decode(xdr, 4);
965 if (unlikely(p == NULL))
966 goto out_fail;
967 len = be32_to_cpup(p);
968
969 /*
970 * If the returned universal address is a null string,
971 * the requested RPC service was not registered.
972 */
973 if (len == 0) {
974 dprintk("RPC: %5u RPCB reply: program not registered\n",
975 req->rq_task->tk_pid);
976 return 0;
977 }
978
979 if (unlikely(len > RPCBIND_MAXUADDRLEN))
980 goto out_fail;
981
982 p = xdr_inline_decode(xdr, len);
983 if (unlikely(p == NULL))
984 goto out_fail;
985 dprintk("RPC: %5u RPCB_%s reply: %*pE\n", req->rq_task->tk_pid,
986 req->rq_task->tk_msg.rpc_proc->p_name, len, (char *)p);
987
988 if (rpc_uaddr2sockaddr(req->rq_xprt->xprt_net, (char *)p, len,
989 sap, sizeof(address)) == 0)
990 goto out_fail;
991 rpcb->r_port = rpc_get_port(sap);
992
993 return 0;
994
995out_fail:
996 dprintk("RPC: %5u malformed RPCB_%s reply\n",
997 req->rq_task->tk_pid,
998 req->rq_task->tk_msg.rpc_proc->p_name);
999 return -EIO;
1000}
1001
1002/*
1003 * Not all rpcbind procedures described in RFC 1833 are implemented
1004 * since the Linux kernel RPC code requires only these.
1005 */
1006
1007static const struct rpc_procinfo rpcb_procedures2[] = {
1008 [RPCBPROC_SET] = {
1009 .p_proc = RPCBPROC_SET,
1010 .p_encode = rpcb_enc_mapping,
1011 .p_decode = rpcb_dec_set,
1012 .p_arglen = RPCB_mappingargs_sz,
1013 .p_replen = RPCB_setres_sz,
1014 .p_statidx = RPCBPROC_SET,
1015 .p_timer = 0,
1016 .p_name = "SET",
1017 },
1018 [RPCBPROC_UNSET] = {
1019 .p_proc = RPCBPROC_UNSET,
1020 .p_encode = rpcb_enc_mapping,
1021 .p_decode = rpcb_dec_set,
1022 .p_arglen = RPCB_mappingargs_sz,
1023 .p_replen = RPCB_setres_sz,
1024 .p_statidx = RPCBPROC_UNSET,
1025 .p_timer = 0,
1026 .p_name = "UNSET",
1027 },
1028 [RPCBPROC_GETPORT] = {
1029 .p_proc = RPCBPROC_GETPORT,
1030 .p_encode = rpcb_enc_mapping,
1031 .p_decode = rpcb_dec_getport,
1032 .p_arglen = RPCB_mappingargs_sz,
1033 .p_replen = RPCB_getportres_sz,
1034 .p_statidx = RPCBPROC_GETPORT,
1035 .p_timer = 0,
1036 .p_name = "GETPORT",
1037 },
1038};
1039
1040static const struct rpc_procinfo rpcb_procedures3[] = {
1041 [RPCBPROC_SET] = {
1042 .p_proc = RPCBPROC_SET,
1043 .p_encode = rpcb_enc_getaddr,
1044 .p_decode = rpcb_dec_set,
1045 .p_arglen = RPCB_getaddrargs_sz,
1046 .p_replen = RPCB_setres_sz,
1047 .p_statidx = RPCBPROC_SET,
1048 .p_timer = 0,
1049 .p_name = "SET",
1050 },
1051 [RPCBPROC_UNSET] = {
1052 .p_proc = RPCBPROC_UNSET,
1053 .p_encode = rpcb_enc_getaddr,
1054 .p_decode = rpcb_dec_set,
1055 .p_arglen = RPCB_getaddrargs_sz,
1056 .p_replen = RPCB_setres_sz,
1057 .p_statidx = RPCBPROC_UNSET,
1058 .p_timer = 0,
1059 .p_name = "UNSET",
1060 },
1061 [RPCBPROC_GETADDR] = {
1062 .p_proc = RPCBPROC_GETADDR,
1063 .p_encode = rpcb_enc_getaddr,
1064 .p_decode = rpcb_dec_getaddr,
1065 .p_arglen = RPCB_getaddrargs_sz,
1066 .p_replen = RPCB_getaddrres_sz,
1067 .p_statidx = RPCBPROC_GETADDR,
1068 .p_timer = 0,
1069 .p_name = "GETADDR",
1070 },
1071};
1072
1073static const struct rpc_procinfo rpcb_procedures4[] = {
1074 [RPCBPROC_SET] = {
1075 .p_proc = RPCBPROC_SET,
1076 .p_encode = rpcb_enc_getaddr,
1077 .p_decode = rpcb_dec_set,
1078 .p_arglen = RPCB_getaddrargs_sz,
1079 .p_replen = RPCB_setres_sz,
1080 .p_statidx = RPCBPROC_SET,
1081 .p_timer = 0,
1082 .p_name = "SET",
1083 },
1084 [RPCBPROC_UNSET] = {
1085 .p_proc = RPCBPROC_UNSET,
1086 .p_encode = rpcb_enc_getaddr,
1087 .p_decode = rpcb_dec_set,
1088 .p_arglen = RPCB_getaddrargs_sz,
1089 .p_replen = RPCB_setres_sz,
1090 .p_statidx = RPCBPROC_UNSET,
1091 .p_timer = 0,
1092 .p_name = "UNSET",
1093 },
1094 [RPCBPROC_GETADDR] = {
1095 .p_proc = RPCBPROC_GETADDR,
1096 .p_encode = rpcb_enc_getaddr,
1097 .p_decode = rpcb_dec_getaddr,
1098 .p_arglen = RPCB_getaddrargs_sz,
1099 .p_replen = RPCB_getaddrres_sz,
1100 .p_statidx = RPCBPROC_GETADDR,
1101 .p_timer = 0,
1102 .p_name = "GETADDR",
1103 },
1104};
1105
1106static const struct rpcb_info rpcb_next_version[] = {
1107 {
1108 .rpc_vers = RPCBVERS_2,
1109 .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT],
1110 },
1111 {
1112 .rpc_proc = NULL,
1113 },
1114};
1115
1116static const struct rpcb_info rpcb_next_version6[] = {
1117 {
1118 .rpc_vers = RPCBVERS_4,
1119 .rpc_proc = &rpcb_procedures4[RPCBPROC_GETADDR],
1120 },
1121 {
1122 .rpc_vers = RPCBVERS_3,
1123 .rpc_proc = &rpcb_procedures3[RPCBPROC_GETADDR],
1124 },
1125 {
1126 .rpc_proc = NULL,
1127 },
1128};
1129
1130static unsigned int rpcb_version2_counts[ARRAY_SIZE(rpcb_procedures2)];
1131static const struct rpc_version rpcb_version2 = {
1132 .number = RPCBVERS_2,
1133 .nrprocs = ARRAY_SIZE(rpcb_procedures2),
1134 .procs = rpcb_procedures2,
1135 .counts = rpcb_version2_counts,
1136};
1137
1138static unsigned int rpcb_version3_counts[ARRAY_SIZE(rpcb_procedures3)];
1139static const struct rpc_version rpcb_version3 = {
1140 .number = RPCBVERS_3,
1141 .nrprocs = ARRAY_SIZE(rpcb_procedures3),
1142 .procs = rpcb_procedures3,
1143 .counts = rpcb_version3_counts,
1144};
1145
1146static unsigned int rpcb_version4_counts[ARRAY_SIZE(rpcb_procedures4)];
1147static const struct rpc_version rpcb_version4 = {
1148 .number = RPCBVERS_4,
1149 .nrprocs = ARRAY_SIZE(rpcb_procedures4),
1150 .procs = rpcb_procedures4,
1151 .counts = rpcb_version4_counts,
1152};
1153
1154static const struct rpc_version *rpcb_version[] = {
1155 NULL,
1156 NULL,
1157 &rpcb_version2,
1158 &rpcb_version3,
1159 &rpcb_version4
1160};
1161
1162static struct rpc_stat rpcb_stats;
1163
1164static const struct rpc_program rpcb_program = {
1165 .name = "rpcbind",
1166 .number = RPCBIND_PROGRAM,
1167 .nrvers = ARRAY_SIZE(rpcb_version),
1168 .version = rpcb_version,
1169 .stats = &rpcb_stats,
1170};