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/in.h>
20 #include <linux/in6.h>
21 #include <linux/kernel.h>
22 #include <linux/errno.h>
23 #include <linux/mutex.h>
24 #include <linux/slab.h>
25 #include <net/ipv6.h>
26
27 #include <linux/sunrpc/clnt.h>
28 #include <linux/sunrpc/sched.h>
29 #include <linux/sunrpc/xprtsock.h>
30
31 #ifdef RPC_DEBUG
32 # define RPCDBG_FACILITY RPCDBG_BIND
33 #endif
34
35 #define RPCBIND_PROGRAM (100000u)
36 #define RPCBIND_PORT (111u)
37
38 #define RPCBVERS_2 (2u)
39 #define RPCBVERS_3 (3u)
40 #define RPCBVERS_4 (4u)
41
42 enum {
43 RPCBPROC_NULL,
44 RPCBPROC_SET,
45 RPCBPROC_UNSET,
46 RPCBPROC_GETPORT,
47 RPCBPROC_GETADDR = 3, /* alias for GETPORT */
48 RPCBPROC_DUMP,
49 RPCBPROC_CALLIT,
50 RPCBPROC_BCAST = 5, /* alias for CALLIT */
51 RPCBPROC_GETTIME,
52 RPCBPROC_UADDR2TADDR,
53 RPCBPROC_TADDR2UADDR,
54 RPCBPROC_GETVERSADDR,
55 RPCBPROC_INDIRECT,
56 RPCBPROC_GETADDRLIST,
57 RPCBPROC_GETSTAT,
58 };
59
60 /*
61 * r_owner
62 *
63 * The "owner" is allowed to unset a service in the rpcbind database.
64 *
65 * For AF_LOCAL SET/UNSET requests, rpcbind treats this string as a
66 * UID which it maps to a local user name via a password lookup.
67 * In all other cases it is ignored.
68 *
69 * For SET/UNSET requests, user space provides a value, even for
70 * network requests, and GETADDR uses an empty string. We follow
71 * those precedents here.
72 */
73 #define RPCB_OWNER_STRING "0"
74 #define RPCB_MAXOWNERLEN sizeof(RPCB_OWNER_STRING)
75
76 /*
77 * XDR data type sizes
78 */
79 #define RPCB_program_sz (1)
80 #define RPCB_version_sz (1)
81 #define RPCB_protocol_sz (1)
82 #define RPCB_port_sz (1)
83 #define RPCB_boolean_sz (1)
84
85 #define RPCB_netid_sz (1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN))
86 #define RPCB_addr_sz (1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN))
87 #define RPCB_ownerstring_sz (1 + XDR_QUADLEN(RPCB_MAXOWNERLEN))
88
89 /*
90 * XDR argument and result sizes
91 */
92 #define RPCB_mappingargs_sz (RPCB_program_sz + RPCB_version_sz + \
93 RPCB_protocol_sz + RPCB_port_sz)
94 #define RPCB_getaddrargs_sz (RPCB_program_sz + RPCB_version_sz + \
95 RPCB_netid_sz + RPCB_addr_sz + \
96 RPCB_ownerstring_sz)
97
98 #define RPCB_getportres_sz RPCB_port_sz
99 #define RPCB_setres_sz RPCB_boolean_sz
100
101 /*
102 * Note that RFC 1833 does not put any size restrictions on the
103 * address string returned by the remote rpcbind database.
104 */
105 #define RPCB_getaddrres_sz RPCB_addr_sz
106
107 static void rpcb_getport_done(struct rpc_task *, void *);
108 static void rpcb_map_release(void *data);
109 static struct rpc_program rpcb_program;
110
111 static struct rpc_clnt * rpcb_local_clnt;
112 static struct rpc_clnt * rpcb_local_clnt4;
113
114 struct rpcbind_args {
115 struct rpc_xprt * r_xprt;
116
117 u32 r_prog;
118 u32 r_vers;
119 u32 r_prot;
120 unsigned short r_port;
121 const char * r_netid;
122 const char * r_addr;
123 const char * r_owner;
124
125 int r_status;
126 };
127
128 static struct rpc_procinfo rpcb_procedures2[];
129 static struct rpc_procinfo rpcb_procedures3[];
130 static struct rpc_procinfo rpcb_procedures4[];
131
132 struct rpcb_info {
133 u32 rpc_vers;
134 struct rpc_procinfo * rpc_proc;
135 };
136
137 static struct rpcb_info rpcb_next_version[];
138 static struct rpcb_info rpcb_next_version6[];
139
140 static const struct rpc_call_ops rpcb_getport_ops = {
141 .rpc_call_done = rpcb_getport_done,
142 .rpc_release = rpcb_map_release,
143 };
144
rpcb_wake_rpcbind_waiters(struct rpc_xprt * xprt,int status)145 static void rpcb_wake_rpcbind_waiters(struct rpc_xprt *xprt, int status)
146 {
147 xprt_clear_binding(xprt);
148 rpc_wake_up_status(&xprt->binding, status);
149 }
150
rpcb_map_release(void * data)151 static void rpcb_map_release(void *data)
152 {
153 struct rpcbind_args *map = data;
154
155 rpcb_wake_rpcbind_waiters(map->r_xprt, map->r_status);
156 xprt_put(map->r_xprt);
157 kfree(map->r_addr);
158 kfree(map);
159 }
160
161 static const struct sockaddr_in rpcb_inaddr_loopback = {
162 .sin_family = AF_INET,
163 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
164 .sin_port = htons(RPCBIND_PORT),
165 };
166
167 static DEFINE_MUTEX(rpcb_create_local_mutex);
168
169 /*
170 * Returns zero on success, otherwise a negative errno value
171 * is returned.
172 */
rpcb_create_local(void)173 static int rpcb_create_local(void)
174 {
175 struct rpc_create_args args = {
176 .net = &init_net,
177 .protocol = XPRT_TRANSPORT_TCP,
178 .address = (struct sockaddr *)&rpcb_inaddr_loopback,
179 .addrsize = sizeof(rpcb_inaddr_loopback),
180 .servername = "localhost",
181 .program = &rpcb_program,
182 .version = RPCBVERS_2,
183 .authflavor = RPC_AUTH_UNIX,
184 .flags = RPC_CLNT_CREATE_NOPING,
185 };
186 struct rpc_clnt *clnt, *clnt4;
187 int result = 0;
188
189 if (rpcb_local_clnt)
190 return result;
191
192 mutex_lock(&rpcb_create_local_mutex);
193 if (rpcb_local_clnt)
194 goto out;
195
196 clnt = rpc_create(&args);
197 if (IS_ERR(clnt)) {
198 dprintk("RPC: failed to create local rpcbind "
199 "client (errno %ld).\n", PTR_ERR(clnt));
200 result = -PTR_ERR(clnt);
201 goto out;
202 }
203
204 /*
205 * This results in an RPC ping. On systems running portmapper,
206 * the v4 ping will fail. Proceed anyway, but disallow rpcb
207 * v4 upcalls.
208 */
209 clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4);
210 if (IS_ERR(clnt4)) {
211 dprintk("RPC: failed to bind second program to "
212 "rpcbind v4 client (errno %ld).\n",
213 PTR_ERR(clnt4));
214 clnt4 = NULL;
215 }
216
217 rpcb_local_clnt = clnt;
218 rpcb_local_clnt4 = clnt4;
219
220 out:
221 mutex_unlock(&rpcb_create_local_mutex);
222 return result;
223 }
224
rpcb_create(char * hostname,struct sockaddr * srvaddr,size_t salen,int proto,u32 version)225 static struct rpc_clnt *rpcb_create(char *hostname, struct sockaddr *srvaddr,
226 size_t salen, int proto, u32 version)
227 {
228 struct rpc_create_args args = {
229 .net = &init_net,
230 .protocol = proto,
231 .address = srvaddr,
232 .addrsize = salen,
233 .servername = hostname,
234 .program = &rpcb_program,
235 .version = version,
236 .authflavor = RPC_AUTH_UNIX,
237 .flags = (RPC_CLNT_CREATE_NOPING |
238 RPC_CLNT_CREATE_NONPRIVPORT),
239 };
240
241 switch (srvaddr->sa_family) {
242 case AF_INET:
243 ((struct sockaddr_in *)srvaddr)->sin_port = htons(RPCBIND_PORT);
244 break;
245 case AF_INET6:
246 ((struct sockaddr_in6 *)srvaddr)->sin6_port = htons(RPCBIND_PORT);
247 break;
248 default:
249 return ERR_PTR(-EAFNOSUPPORT);
250 }
251
252 return rpc_create(&args);
253 }
254
rpcb_register_call(struct rpc_clnt * clnt,struct rpc_message * msg)255 static int rpcb_register_call(struct rpc_clnt *clnt, struct rpc_message *msg)
256 {
257 int result, error = 0;
258
259 msg->rpc_resp = &result;
260
261 error = rpc_call_sync(clnt, msg, RPC_TASK_SOFTCONN);
262 if (error < 0) {
263 dprintk("RPC: failed to contact local rpcbind "
264 "server (errno %d).\n", -error);
265 return error;
266 }
267
268 if (!result)
269 return -EACCES;
270 return 0;
271 }
272
273 /**
274 * rpcb_register - set or unset a port registration with the local rpcbind svc
275 * @prog: RPC program number to bind
276 * @vers: RPC version number to bind
277 * @prot: transport protocol to register
278 * @port: port value to register
279 *
280 * Returns zero if the registration request was dispatched successfully
281 * and the rpcbind daemon returned success. Otherwise, returns an errno
282 * value that reflects the nature of the error (request could not be
283 * dispatched, timed out, or rpcbind returned an error).
284 *
285 * RPC services invoke this function to advertise their contact
286 * information via the system's rpcbind daemon. RPC services
287 * invoke this function once for each [program, version, transport]
288 * tuple they wish to advertise.
289 *
290 * Callers may also unregister RPC services that are no longer
291 * available by setting the passed-in port to zero. This removes
292 * all registered transports for [program, version] from the local
293 * rpcbind database.
294 *
295 * This function uses rpcbind protocol version 2 to contact the
296 * local rpcbind daemon.
297 *
298 * Registration works over both AF_INET and AF_INET6, and services
299 * registered via this function are advertised as available for any
300 * address. If the local rpcbind daemon is listening on AF_INET6,
301 * services registered via this function will be advertised on
302 * IN6ADDR_ANY (ie available for all AF_INET and AF_INET6
303 * addresses).
304 */
rpcb_register(u32 prog,u32 vers,int prot,unsigned short port)305 int rpcb_register(u32 prog, u32 vers, int prot, unsigned short port)
306 {
307 struct rpcbind_args map = {
308 .r_prog = prog,
309 .r_vers = vers,
310 .r_prot = prot,
311 .r_port = port,
312 };
313 struct rpc_message msg = {
314 .rpc_argp = &map,
315 };
316 int error;
317
318 error = rpcb_create_local();
319 if (error)
320 return error;
321
322 dprintk("RPC: %sregistering (%u, %u, %d, %u) with local "
323 "rpcbind\n", (port ? "" : "un"),
324 prog, vers, prot, port);
325
326 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_UNSET];
327 if (port)
328 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_SET];
329
330 return rpcb_register_call(rpcb_local_clnt, &msg);
331 }
332
333 /*
334 * Fill in AF_INET family-specific arguments to register
335 */
rpcb_register_inet4(const struct sockaddr * sap,struct rpc_message * msg)336 static int rpcb_register_inet4(const struct sockaddr *sap,
337 struct rpc_message *msg)
338 {
339 const struct sockaddr_in *sin = (const struct sockaddr_in *)sap;
340 struct rpcbind_args *map = msg->rpc_argp;
341 unsigned short port = ntohs(sin->sin_port);
342 int result;
343
344 map->r_addr = rpc_sockaddr2uaddr(sap);
345
346 dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with "
347 "local rpcbind\n", (port ? "" : "un"),
348 map->r_prog, map->r_vers,
349 map->r_addr, map->r_netid);
350
351 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
352 if (port)
353 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
354
355 result = rpcb_register_call(rpcb_local_clnt4, msg);
356 kfree(map->r_addr);
357 return result;
358 }
359
360 /*
361 * Fill in AF_INET6 family-specific arguments to register
362 */
rpcb_register_inet6(const struct sockaddr * sap,struct rpc_message * msg)363 static int rpcb_register_inet6(const struct sockaddr *sap,
364 struct rpc_message *msg)
365 {
366 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sap;
367 struct rpcbind_args *map = msg->rpc_argp;
368 unsigned short port = ntohs(sin6->sin6_port);
369 int result;
370
371 map->r_addr = rpc_sockaddr2uaddr(sap);
372
373 dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with "
374 "local rpcbind\n", (port ? "" : "un"),
375 map->r_prog, map->r_vers,
376 map->r_addr, map->r_netid);
377
378 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
379 if (port)
380 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
381
382 result = rpcb_register_call(rpcb_local_clnt4, msg);
383 kfree(map->r_addr);
384 return result;
385 }
386
rpcb_unregister_all_protofamilies(struct rpc_message * msg)387 static int rpcb_unregister_all_protofamilies(struct rpc_message *msg)
388 {
389 struct rpcbind_args *map = msg->rpc_argp;
390
391 dprintk("RPC: unregistering [%u, %u, '%s'] with "
392 "local rpcbind\n",
393 map->r_prog, map->r_vers, map->r_netid);
394
395 map->r_addr = "";
396 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
397
398 return rpcb_register_call(rpcb_local_clnt4, msg);
399 }
400
401 /**
402 * rpcb_v4_register - set or unset a port registration with the local rpcbind
403 * @program: RPC program number of service to (un)register
404 * @version: RPC version number of service to (un)register
405 * @address: address family, IP address, and port to (un)register
406 * @netid: netid of transport protocol to (un)register
407 *
408 * Returns zero if the registration request was dispatched successfully
409 * and the rpcbind daemon returned success. Otherwise, returns an errno
410 * value that reflects the nature of the error (request could not be
411 * dispatched, timed out, or rpcbind returned an error).
412 *
413 * RPC services invoke this function to advertise their contact
414 * information via the system's rpcbind daemon. RPC services
415 * invoke this function once for each [program, version, address,
416 * netid] tuple they wish to advertise.
417 *
418 * Callers may also unregister RPC services that are registered at a
419 * specific address by setting the port number in @address to zero.
420 * They may unregister all registered protocol families at once for
421 * a service by passing a NULL @address argument. If @netid is ""
422 * then all netids for [program, version, address] are unregistered.
423 *
424 * This function uses rpcbind protocol version 4 to contact the
425 * local rpcbind daemon. The local rpcbind daemon must support
426 * version 4 of the rpcbind protocol in order for these functions
427 * to register a service successfully.
428 *
429 * Supported netids include "udp" and "tcp" for UDP and TCP over
430 * IPv4, and "udp6" and "tcp6" for UDP and TCP over IPv6,
431 * respectively.
432 *
433 * The contents of @address determine the address family and the
434 * port to be registered. The usual practice is to pass INADDR_ANY
435 * as the raw address, but specifying a non-zero address is also
436 * supported by this API if the caller wishes to advertise an RPC
437 * service on a specific network interface.
438 *
439 * Note that passing in INADDR_ANY does not create the same service
440 * registration as IN6ADDR_ANY. The former advertises an RPC
441 * service on any IPv4 address, but not on IPv6. The latter
442 * advertises the service on all IPv4 and IPv6 addresses.
443 */
rpcb_v4_register(const u32 program,const u32 version,const struct sockaddr * address,const char * netid)444 int rpcb_v4_register(const u32 program, const u32 version,
445 const struct sockaddr *address, const char *netid)
446 {
447 struct rpcbind_args map = {
448 .r_prog = program,
449 .r_vers = version,
450 .r_netid = netid,
451 .r_owner = RPCB_OWNER_STRING,
452 };
453 struct rpc_message msg = {
454 .rpc_argp = &map,
455 };
456 int error;
457
458 error = rpcb_create_local();
459 if (error)
460 return error;
461 if (rpcb_local_clnt4 == NULL)
462 return -EPROTONOSUPPORT;
463
464 if (address == NULL)
465 return rpcb_unregister_all_protofamilies(&msg);
466
467 switch (address->sa_family) {
468 case AF_INET:
469 return rpcb_register_inet4(address, &msg);
470 case AF_INET6:
471 return rpcb_register_inet6(address, &msg);
472 }
473
474 return -EAFNOSUPPORT;
475 }
476
rpcb_call_async(struct rpc_clnt * rpcb_clnt,struct rpcbind_args * map,struct rpc_procinfo * proc)477 static struct rpc_task *rpcb_call_async(struct rpc_clnt *rpcb_clnt, struct rpcbind_args *map, struct rpc_procinfo *proc)
478 {
479 struct rpc_message msg = {
480 .rpc_proc = proc,
481 .rpc_argp = map,
482 .rpc_resp = map,
483 };
484 struct rpc_task_setup task_setup_data = {
485 .rpc_client = rpcb_clnt,
486 .rpc_message = &msg,
487 .callback_ops = &rpcb_getport_ops,
488 .callback_data = map,
489 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFTCONN,
490 };
491
492 return rpc_run_task(&task_setup_data);
493 }
494
495 /*
496 * In the case where rpc clients have been cloned, we want to make
497 * sure that we use the program number/version etc of the actual
498 * owner of the xprt. To do so, we walk back up the tree of parents
499 * to find whoever created the transport and/or whoever has the
500 * autobind flag set.
501 */
rpcb_find_transport_owner(struct rpc_clnt * clnt)502 static struct rpc_clnt *rpcb_find_transport_owner(struct rpc_clnt *clnt)
503 {
504 struct rpc_clnt *parent = clnt->cl_parent;
505
506 while (parent != clnt) {
507 if (parent->cl_xprt != clnt->cl_xprt)
508 break;
509 if (clnt->cl_autobind)
510 break;
511 clnt = parent;
512 parent = parent->cl_parent;
513 }
514 return clnt;
515 }
516
517 /**
518 * rpcb_getport_async - obtain the port for a given RPC service on a given host
519 * @task: task that is waiting for portmapper request
520 *
521 * This one can be called for an ongoing RPC request, and can be used in
522 * an async (rpciod) context.
523 */
rpcb_getport_async(struct rpc_task * task)524 void rpcb_getport_async(struct rpc_task *task)
525 {
526 struct rpc_clnt *clnt;
527 struct rpc_procinfo *proc;
528 u32 bind_version;
529 struct rpc_xprt *xprt;
530 struct rpc_clnt *rpcb_clnt;
531 static struct rpcbind_args *map;
532 struct rpc_task *child;
533 struct sockaddr_storage addr;
534 struct sockaddr *sap = (struct sockaddr *)&addr;
535 size_t salen;
536 int status;
537
538 clnt = rpcb_find_transport_owner(task->tk_client);
539 xprt = clnt->cl_xprt;
540
541 dprintk("RPC: %5u %s(%s, %u, %u, %d)\n",
542 task->tk_pid, __func__,
543 clnt->cl_server, clnt->cl_prog, clnt->cl_vers, xprt->prot);
544
545 /* Put self on the wait queue to ensure we get notified if
546 * some other task is already attempting to bind the port */
547 rpc_sleep_on(&xprt->binding, task, NULL);
548
549 if (xprt_test_and_set_binding(xprt)) {
550 dprintk("RPC: %5u %s: waiting for another binder\n",
551 task->tk_pid, __func__);
552 return;
553 }
554
555 /* Someone else may have bound if we slept */
556 if (xprt_bound(xprt)) {
557 status = 0;
558 dprintk("RPC: %5u %s: already bound\n",
559 task->tk_pid, __func__);
560 goto bailout_nofree;
561 }
562
563 /* Parent transport's destination address */
564 salen = rpc_peeraddr(clnt, sap, sizeof(addr));
565
566 /* Don't ever use rpcbind v2 for AF_INET6 requests */
567 switch (sap->sa_family) {
568 case AF_INET:
569 proc = rpcb_next_version[xprt->bind_index].rpc_proc;
570 bind_version = rpcb_next_version[xprt->bind_index].rpc_vers;
571 break;
572 case AF_INET6:
573 proc = rpcb_next_version6[xprt->bind_index].rpc_proc;
574 bind_version = rpcb_next_version6[xprt->bind_index].rpc_vers;
575 break;
576 default:
577 status = -EAFNOSUPPORT;
578 dprintk("RPC: %5u %s: bad address family\n",
579 task->tk_pid, __func__);
580 goto bailout_nofree;
581 }
582 if (proc == NULL) {
583 xprt->bind_index = 0;
584 status = -EPFNOSUPPORT;
585 dprintk("RPC: %5u %s: no more getport versions available\n",
586 task->tk_pid, __func__);
587 goto bailout_nofree;
588 }
589
590 dprintk("RPC: %5u %s: trying rpcbind version %u\n",
591 task->tk_pid, __func__, bind_version);
592
593 rpcb_clnt = rpcb_create(clnt->cl_server, sap, salen, xprt->prot,
594 bind_version);
595 if (IS_ERR(rpcb_clnt)) {
596 status = PTR_ERR(rpcb_clnt);
597 dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n",
598 task->tk_pid, __func__, PTR_ERR(rpcb_clnt));
599 goto bailout_nofree;
600 }
601
602 map = kzalloc(sizeof(struct rpcbind_args), GFP_ATOMIC);
603 if (!map) {
604 status = -ENOMEM;
605 dprintk("RPC: %5u %s: no memory available\n",
606 task->tk_pid, __func__);
607 goto bailout_release_client;
608 }
609 map->r_prog = clnt->cl_prog;
610 map->r_vers = clnt->cl_vers;
611 map->r_prot = xprt->prot;
612 map->r_port = 0;
613 map->r_xprt = xprt_get(xprt);
614 map->r_status = -EIO;
615
616 switch (bind_version) {
617 case RPCBVERS_4:
618 case RPCBVERS_3:
619 map->r_netid = rpc_peeraddr2str(clnt, RPC_DISPLAY_NETID);
620 map->r_addr = rpc_sockaddr2uaddr(sap);
621 map->r_owner = "";
622 break;
623 case RPCBVERS_2:
624 map->r_addr = NULL;
625 break;
626 default:
627 BUG();
628 }
629
630 child = rpcb_call_async(rpcb_clnt, map, proc);
631 rpc_release_client(rpcb_clnt);
632 if (IS_ERR(child)) {
633 /* rpcb_map_release() has freed the arguments */
634 dprintk("RPC: %5u %s: rpc_run_task failed\n",
635 task->tk_pid, __func__);
636 return;
637 }
638
639 xprt->stat.bind_count++;
640 rpc_put_task(child);
641 return;
642
643 bailout_release_client:
644 rpc_release_client(rpcb_clnt);
645 bailout_nofree:
646 rpcb_wake_rpcbind_waiters(xprt, status);
647 task->tk_status = status;
648 }
649 EXPORT_SYMBOL_GPL(rpcb_getport_async);
650
651 /*
652 * Rpcbind child task calls this callback via tk_exit.
653 */
rpcb_getport_done(struct rpc_task * child,void * data)654 static void rpcb_getport_done(struct rpc_task *child, void *data)
655 {
656 struct rpcbind_args *map = data;
657 struct rpc_xprt *xprt = map->r_xprt;
658 int status = child->tk_status;
659
660 /* Garbage reply: retry with a lesser rpcbind version */
661 if (status == -EIO)
662 status = -EPROTONOSUPPORT;
663
664 /* rpcbind server doesn't support this rpcbind protocol version */
665 if (status == -EPROTONOSUPPORT)
666 xprt->bind_index++;
667
668 if (status < 0) {
669 /* rpcbind server not available on remote host? */
670 xprt->ops->set_port(xprt, 0);
671 } else if (map->r_port == 0) {
672 /* Requested RPC service wasn't registered on remote host */
673 xprt->ops->set_port(xprt, 0);
674 status = -EACCES;
675 } else {
676 /* Succeeded */
677 xprt->ops->set_port(xprt, map->r_port);
678 xprt_set_bound(xprt);
679 status = 0;
680 }
681
682 dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n",
683 child->tk_pid, status, map->r_port);
684
685 map->r_status = status;
686 }
687
688 /*
689 * XDR functions for rpcbind
690 */
691
rpcb_enc_mapping(struct rpc_rqst * req,struct xdr_stream * xdr,const struct rpcbind_args * rpcb)692 static void rpcb_enc_mapping(struct rpc_rqst *req, struct xdr_stream *xdr,
693 const struct rpcbind_args *rpcb)
694 {
695 struct rpc_task *task = req->rq_task;
696 __be32 *p;
697
698 dprintk("RPC: %5u encoding PMAP_%s call (%u, %u, %d, %u)\n",
699 task->tk_pid, task->tk_msg.rpc_proc->p_name,
700 rpcb->r_prog, rpcb->r_vers, rpcb->r_prot, rpcb->r_port);
701
702 p = xdr_reserve_space(xdr, RPCB_mappingargs_sz << 2);
703 *p++ = cpu_to_be32(rpcb->r_prog);
704 *p++ = cpu_to_be32(rpcb->r_vers);
705 *p++ = cpu_to_be32(rpcb->r_prot);
706 *p = cpu_to_be32(rpcb->r_port);
707 }
708
rpcb_dec_getport(struct rpc_rqst * req,struct xdr_stream * xdr,struct rpcbind_args * rpcb)709 static int rpcb_dec_getport(struct rpc_rqst *req, struct xdr_stream *xdr,
710 struct rpcbind_args *rpcb)
711 {
712 struct rpc_task *task = req->rq_task;
713 unsigned long port;
714 __be32 *p;
715
716 rpcb->r_port = 0;
717
718 p = xdr_inline_decode(xdr, 4);
719 if (unlikely(p == NULL))
720 return -EIO;
721
722 port = be32_to_cpup(p);
723 dprintk("RPC: %5u PMAP_%s result: %lu\n", task->tk_pid,
724 task->tk_msg.rpc_proc->p_name, port);
725 if (unlikely(port > USHRT_MAX))
726 return -EIO;
727
728 rpcb->r_port = port;
729 return 0;
730 }
731
rpcb_dec_set(struct rpc_rqst * req,struct xdr_stream * xdr,unsigned int * boolp)732 static int rpcb_dec_set(struct rpc_rqst *req, struct xdr_stream *xdr,
733 unsigned int *boolp)
734 {
735 struct rpc_task *task = req->rq_task;
736 __be32 *p;
737
738 p = xdr_inline_decode(xdr, 4);
739 if (unlikely(p == NULL))
740 return -EIO;
741
742 *boolp = 0;
743 if (*p != xdr_zero)
744 *boolp = 1;
745
746 dprintk("RPC: %5u RPCB_%s call %s\n",
747 task->tk_pid, task->tk_msg.rpc_proc->p_name,
748 (*boolp ? "succeeded" : "failed"));
749 return 0;
750 }
751
encode_rpcb_string(struct xdr_stream * xdr,const char * string,const u32 maxstrlen)752 static void encode_rpcb_string(struct xdr_stream *xdr, const char *string,
753 const u32 maxstrlen)
754 {
755 __be32 *p;
756 u32 len;
757
758 len = strlen(string);
759 BUG_ON(len > maxstrlen);
760 p = xdr_reserve_space(xdr, 4 + len);
761 xdr_encode_opaque(p, string, len);
762 }
763
rpcb_enc_getaddr(struct rpc_rqst * req,struct xdr_stream * xdr,const struct rpcbind_args * rpcb)764 static void rpcb_enc_getaddr(struct rpc_rqst *req, struct xdr_stream *xdr,
765 const struct rpcbind_args *rpcb)
766 {
767 struct rpc_task *task = req->rq_task;
768 __be32 *p;
769
770 dprintk("RPC: %5u encoding RPCB_%s call (%u, %u, '%s', '%s')\n",
771 task->tk_pid, task->tk_msg.rpc_proc->p_name,
772 rpcb->r_prog, rpcb->r_vers,
773 rpcb->r_netid, rpcb->r_addr);
774
775 p = xdr_reserve_space(xdr, (RPCB_program_sz + RPCB_version_sz) << 2);
776 *p++ = cpu_to_be32(rpcb->r_prog);
777 *p = cpu_to_be32(rpcb->r_vers);
778
779 encode_rpcb_string(xdr, rpcb->r_netid, RPCBIND_MAXNETIDLEN);
780 encode_rpcb_string(xdr, rpcb->r_addr, RPCBIND_MAXUADDRLEN);
781 encode_rpcb_string(xdr, rpcb->r_owner, RPCB_MAXOWNERLEN);
782 }
783
rpcb_dec_getaddr(struct rpc_rqst * req,struct xdr_stream * xdr,struct rpcbind_args * rpcb)784 static int rpcb_dec_getaddr(struct rpc_rqst *req, struct xdr_stream *xdr,
785 struct rpcbind_args *rpcb)
786 {
787 struct sockaddr_storage address;
788 struct sockaddr *sap = (struct sockaddr *)&address;
789 struct rpc_task *task = req->rq_task;
790 __be32 *p;
791 u32 len;
792
793 rpcb->r_port = 0;
794
795 p = xdr_inline_decode(xdr, 4);
796 if (unlikely(p == NULL))
797 goto out_fail;
798 len = be32_to_cpup(p);
799
800 /*
801 * If the returned universal address is a null string,
802 * the requested RPC service was not registered.
803 */
804 if (len == 0) {
805 dprintk("RPC: %5u RPCB reply: program not registered\n",
806 task->tk_pid);
807 return 0;
808 }
809
810 if (unlikely(len > RPCBIND_MAXUADDRLEN))
811 goto out_fail;
812
813 p = xdr_inline_decode(xdr, len);
814 if (unlikely(p == NULL))
815 goto out_fail;
816 dprintk("RPC: %5u RPCB_%s reply: %s\n", task->tk_pid,
817 task->tk_msg.rpc_proc->p_name, (char *)p);
818
819 if (rpc_uaddr2sockaddr((char *)p, len, sap, sizeof(address)) == 0)
820 goto out_fail;
821 rpcb->r_port = rpc_get_port(sap);
822
823 return 0;
824
825 out_fail:
826 dprintk("RPC: %5u malformed RPCB_%s reply\n",
827 task->tk_pid, task->tk_msg.rpc_proc->p_name);
828 return -EIO;
829 }
830
831 /*
832 * Not all rpcbind procedures described in RFC 1833 are implemented
833 * since the Linux kernel RPC code requires only these.
834 */
835
836 static struct rpc_procinfo rpcb_procedures2[] = {
837 [RPCBPROC_SET] = {
838 .p_proc = RPCBPROC_SET,
839 .p_encode = (kxdreproc_t)rpcb_enc_mapping,
840 .p_decode = (kxdrdproc_t)rpcb_dec_set,
841 .p_arglen = RPCB_mappingargs_sz,
842 .p_replen = RPCB_setres_sz,
843 .p_statidx = RPCBPROC_SET,
844 .p_timer = 0,
845 .p_name = "SET",
846 },
847 [RPCBPROC_UNSET] = {
848 .p_proc = RPCBPROC_UNSET,
849 .p_encode = (kxdreproc_t)rpcb_enc_mapping,
850 .p_decode = (kxdrdproc_t)rpcb_dec_set,
851 .p_arglen = RPCB_mappingargs_sz,
852 .p_replen = RPCB_setres_sz,
853 .p_statidx = RPCBPROC_UNSET,
854 .p_timer = 0,
855 .p_name = "UNSET",
856 },
857 [RPCBPROC_GETPORT] = {
858 .p_proc = RPCBPROC_GETPORT,
859 .p_encode = (kxdreproc_t)rpcb_enc_mapping,
860 .p_decode = (kxdrdproc_t)rpcb_dec_getport,
861 .p_arglen = RPCB_mappingargs_sz,
862 .p_replen = RPCB_getportres_sz,
863 .p_statidx = RPCBPROC_GETPORT,
864 .p_timer = 0,
865 .p_name = "GETPORT",
866 },
867 };
868
869 static struct rpc_procinfo rpcb_procedures3[] = {
870 [RPCBPROC_SET] = {
871 .p_proc = RPCBPROC_SET,
872 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
873 .p_decode = (kxdrdproc_t)rpcb_dec_set,
874 .p_arglen = RPCB_getaddrargs_sz,
875 .p_replen = RPCB_setres_sz,
876 .p_statidx = RPCBPROC_SET,
877 .p_timer = 0,
878 .p_name = "SET",
879 },
880 [RPCBPROC_UNSET] = {
881 .p_proc = RPCBPROC_UNSET,
882 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
883 .p_decode = (kxdrdproc_t)rpcb_dec_set,
884 .p_arglen = RPCB_getaddrargs_sz,
885 .p_replen = RPCB_setres_sz,
886 .p_statidx = RPCBPROC_UNSET,
887 .p_timer = 0,
888 .p_name = "UNSET",
889 },
890 [RPCBPROC_GETADDR] = {
891 .p_proc = RPCBPROC_GETADDR,
892 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
893 .p_decode = (kxdrdproc_t)rpcb_dec_getaddr,
894 .p_arglen = RPCB_getaddrargs_sz,
895 .p_replen = RPCB_getaddrres_sz,
896 .p_statidx = RPCBPROC_GETADDR,
897 .p_timer = 0,
898 .p_name = "GETADDR",
899 },
900 };
901
902 static struct rpc_procinfo rpcb_procedures4[] = {
903 [RPCBPROC_SET] = {
904 .p_proc = RPCBPROC_SET,
905 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
906 .p_decode = (kxdrdproc_t)rpcb_dec_set,
907 .p_arglen = RPCB_getaddrargs_sz,
908 .p_replen = RPCB_setres_sz,
909 .p_statidx = RPCBPROC_SET,
910 .p_timer = 0,
911 .p_name = "SET",
912 },
913 [RPCBPROC_UNSET] = {
914 .p_proc = RPCBPROC_UNSET,
915 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
916 .p_decode = (kxdrdproc_t)rpcb_dec_set,
917 .p_arglen = RPCB_getaddrargs_sz,
918 .p_replen = RPCB_setres_sz,
919 .p_statidx = RPCBPROC_UNSET,
920 .p_timer = 0,
921 .p_name = "UNSET",
922 },
923 [RPCBPROC_GETADDR] = {
924 .p_proc = RPCBPROC_GETADDR,
925 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
926 .p_decode = (kxdrdproc_t)rpcb_dec_getaddr,
927 .p_arglen = RPCB_getaddrargs_sz,
928 .p_replen = RPCB_getaddrres_sz,
929 .p_statidx = RPCBPROC_GETADDR,
930 .p_timer = 0,
931 .p_name = "GETADDR",
932 },
933 };
934
935 static struct rpcb_info rpcb_next_version[] = {
936 {
937 .rpc_vers = RPCBVERS_2,
938 .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT],
939 },
940 {
941 .rpc_proc = NULL,
942 },
943 };
944
945 static struct rpcb_info rpcb_next_version6[] = {
946 {
947 .rpc_vers = RPCBVERS_4,
948 .rpc_proc = &rpcb_procedures4[RPCBPROC_GETADDR],
949 },
950 {
951 .rpc_vers = RPCBVERS_3,
952 .rpc_proc = &rpcb_procedures3[RPCBPROC_GETADDR],
953 },
954 {
955 .rpc_proc = NULL,
956 },
957 };
958
959 static struct rpc_version rpcb_version2 = {
960 .number = RPCBVERS_2,
961 .nrprocs = ARRAY_SIZE(rpcb_procedures2),
962 .procs = rpcb_procedures2
963 };
964
965 static struct rpc_version rpcb_version3 = {
966 .number = RPCBVERS_3,
967 .nrprocs = ARRAY_SIZE(rpcb_procedures3),
968 .procs = rpcb_procedures3
969 };
970
971 static struct rpc_version rpcb_version4 = {
972 .number = RPCBVERS_4,
973 .nrprocs = ARRAY_SIZE(rpcb_procedures4),
974 .procs = rpcb_procedures4
975 };
976
977 static struct rpc_version *rpcb_version[] = {
978 NULL,
979 NULL,
980 &rpcb_version2,
981 &rpcb_version3,
982 &rpcb_version4
983 };
984
985 static struct rpc_stat rpcb_stats;
986
987 static struct rpc_program rpcb_program = {
988 .name = "rpcbind",
989 .number = RPCBIND_PROGRAM,
990 .nrvers = ARRAY_SIZE(rpcb_version),
991 .version = rpcb_version,
992 .stats = &rpcb_stats,
993 };
994
995 /**
996 * cleanup_rpcb_clnt - remove xprtsock's sysctls, unregister
997 *
998 */
cleanup_rpcb_clnt(void)999 void cleanup_rpcb_clnt(void)
1000 {
1001 if (rpcb_local_clnt4)
1002 rpc_shutdown_client(rpcb_local_clnt4);
1003 if (rpcb_local_clnt)
1004 rpc_shutdown_client(rpcb_local_clnt);
1005 }
1006