blob: 24db2b4d12d3e43b3faf944262a10105ecaca898 [file] [log] [blame]
Chuck Levera5090502007-03-29 16:48:04 -04001/*
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
Chuck Levercce63cd2007-07-01 12:13:12 -040015#include <linux/module.h>
16
Chuck Levera5090502007-03-29 16:48:04 -040017#include <linux/types.h>
18#include <linux/socket.h>
Chuck Leverd5b64432007-08-06 11:57:18 -040019#include <linux/in.h>
20#include <linux/in6.h>
Chuck Levera5090502007-03-29 16:48:04 -040021#include <linux/kernel.h>
22#include <linux/errno.h>
23
24#include <linux/sunrpc/clnt.h>
25#include <linux/sunrpc/sched.h>
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -040026#include <linux/sunrpc/xprtsock.h>
Chuck Levera5090502007-03-29 16:48:04 -040027
28#ifdef RPC_DEBUG
29# define RPCDBG_FACILITY RPCDBG_BIND
30#endif
31
32#define RPCBIND_PROGRAM (100000u)
33#define RPCBIND_PORT (111u)
34
Chuck Leverfc200e72008-06-25 17:24:31 -040035#define RPCBVERS_2 (2u)
36#define RPCBVERS_3 (3u)
37#define RPCBVERS_4 (4u)
38
Chuck Levera5090502007-03-29 16:48:04 -040039enum {
40 RPCBPROC_NULL,
41 RPCBPROC_SET,
42 RPCBPROC_UNSET,
43 RPCBPROC_GETPORT,
44 RPCBPROC_GETADDR = 3, /* alias for GETPORT */
45 RPCBPROC_DUMP,
46 RPCBPROC_CALLIT,
47 RPCBPROC_BCAST = 5, /* alias for CALLIT */
48 RPCBPROC_GETTIME,
49 RPCBPROC_UADDR2TADDR,
50 RPCBPROC_TADDR2UADDR,
51 RPCBPROC_GETVERSADDR,
52 RPCBPROC_INDIRECT,
53 RPCBPROC_GETADDRLIST,
54 RPCBPROC_GETSTAT,
55};
56
57#define RPCB_HIGHPROC_2 RPCBPROC_CALLIT
58#define RPCB_HIGHPROC_3 RPCBPROC_TADDR2UADDR
59#define RPCB_HIGHPROC_4 RPCBPROC_GETSTAT
60
61/*
Chuck Levera5090502007-03-29 16:48:04 -040062 * r_owner
63 *
64 * The "owner" is allowed to unset a service in the rpcbind database.
65 * We always use the following (arbitrary) fixed string.
66 */
67#define RPCB_OWNER_STRING "rpcb"
68#define RPCB_MAXOWNERLEN sizeof(RPCB_OWNER_STRING)
69
70static void rpcb_getport_done(struct rpc_task *, void *);
Trond Myklebust381ba742008-07-07 12:18:53 -040071static void rpcb_map_release(void *data);
Adrian Bunk7f4adef2007-06-13 01:03:13 +020072static struct rpc_program rpcb_program;
Chuck Levera5090502007-03-29 16:48:04 -040073
74struct rpcbind_args {
75 struct rpc_xprt * r_xprt;
76
77 u32 r_prog;
78 u32 r_vers;
79 u32 r_prot;
80 unsigned short r_port;
Trond Myklebust86d61d82008-01-07 21:16:56 -050081 const char * r_netid;
82 const char * r_addr;
83 const char * r_owner;
Trond Myklebust381ba742008-07-07 12:18:53 -040084
85 int r_status;
Chuck Levera5090502007-03-29 16:48:04 -040086};
87
88static struct rpc_procinfo rpcb_procedures2[];
89static struct rpc_procinfo rpcb_procedures3[];
Chuck Leverc2e1b092008-07-14 16:03:30 -040090static struct rpc_procinfo rpcb_procedures4[];
Chuck Levera5090502007-03-29 16:48:04 -040091
Chuck Leverd5b64432007-08-06 11:57:18 -040092struct rpcb_info {
Chuck Leverfc200e72008-06-25 17:24:31 -040093 u32 rpc_vers;
Chuck Levera5090502007-03-29 16:48:04 -040094 struct rpc_procinfo * rpc_proc;
Chuck Leverd5b64432007-08-06 11:57:18 -040095};
96
97static struct rpcb_info rpcb_next_version[];
98static struct rpcb_info rpcb_next_version6[];
Chuck Levera5090502007-03-29 16:48:04 -040099
Chuck Levera5090502007-03-29 16:48:04 -0400100static const struct rpc_call_ops rpcb_getport_ops = {
Chuck Levera5090502007-03-29 16:48:04 -0400101 .rpc_call_done = rpcb_getport_done,
102 .rpc_release = rpcb_map_release,
103};
104
105static void rpcb_wake_rpcbind_waiters(struct rpc_xprt *xprt, int status)
106{
107 xprt_clear_binding(xprt);
108 rpc_wake_up_status(&xprt->binding, status);
109}
110
Trond Myklebust381ba742008-07-07 12:18:53 -0400111static void rpcb_map_release(void *data)
112{
113 struct rpcbind_args *map = data;
114
115 rpcb_wake_rpcbind_waiters(map->r_xprt, map->r_status);
116 xprt_put(map->r_xprt);
117 kfree(map);
118}
119
Chuck Levercc5598b2008-07-14 16:03:27 -0400120static const struct sockaddr_in rpcb_inaddr_loopback = {
121 .sin_family = AF_INET,
122 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
123 .sin_port = htons(RPCBIND_PORT),
124};
125
Chuck Leverc2e1b092008-07-14 16:03:30 -0400126static const struct sockaddr_in6 rpcb_in6addr_loopback = {
127 .sin6_family = AF_INET6,
128 .sin6_addr = IN6ADDR_LOOPBACK_INIT,
129 .sin6_port = htons(RPCBIND_PORT),
130};
131
Chuck Levercc5598b2008-07-14 16:03:27 -0400132static struct rpc_clnt *rpcb_create_local(struct sockaddr *addr,
133 size_t addrlen, u32 version)
134{
135 struct rpc_create_args args = {
136 .protocol = XPRT_TRANSPORT_UDP,
137 .address = addr,
138 .addrsize = addrlen,
139 .servername = "localhost",
140 .program = &rpcb_program,
141 .version = version,
142 .authflavor = RPC_AUTH_UNIX,
143 .flags = RPC_CLNT_CREATE_NOPING,
144 };
145
146 return rpc_create(&args);
147}
148
Chuck Levera5090502007-03-29 16:48:04 -0400149static struct rpc_clnt *rpcb_create(char *hostname, struct sockaddr *srvaddr,
Chuck Lever423d8b02008-07-14 16:03:28 -0400150 size_t salen, int proto, u32 version)
Chuck Levera5090502007-03-29 16:48:04 -0400151{
152 struct rpc_create_args args = {
153 .protocol = proto,
154 .address = srvaddr,
Chuck Lever9f6ad262007-12-10 14:56:31 -0500155 .addrsize = salen,
Chuck Levera5090502007-03-29 16:48:04 -0400156 .servername = hostname,
157 .program = &rpcb_program,
158 .version = version,
159 .authflavor = RPC_AUTH_UNIX,
Chuck Lever423d8b02008-07-14 16:03:28 -0400160 .flags = (RPC_CLNT_CREATE_NOPING |
161 RPC_CLNT_CREATE_NONPRIVPORT),
Chuck Levera5090502007-03-29 16:48:04 -0400162 };
163
Chuck Leverd5b64432007-08-06 11:57:18 -0400164 switch (srvaddr->sa_family) {
165 case AF_INET:
166 ((struct sockaddr_in *)srvaddr)->sin_port = htons(RPCBIND_PORT);
167 break;
168 case AF_INET6:
169 ((struct sockaddr_in6 *)srvaddr)->sin6_port = htons(RPCBIND_PORT);
170 break;
171 default:
172 return NULL;
173 }
174
Chuck Levera5090502007-03-29 16:48:04 -0400175 return rpc_create(&args);
176}
177
Chuck Leverbabe80e2008-07-14 16:03:29 -0400178static int rpcb_register_call(struct sockaddr *addr, size_t addrlen,
179 u32 version, struct rpc_message *msg,
180 int *result)
181{
182 struct rpc_clnt *rpcb_clnt;
183 int error = 0;
184
185 *result = 0;
186
187 rpcb_clnt = rpcb_create_local(addr, addrlen, version);
188 if (!IS_ERR(rpcb_clnt)) {
189 error = rpc_call_sync(rpcb_clnt, msg, 0);
190 rpc_shutdown_client(rpcb_clnt);
191 } else
192 error = PTR_ERR(rpcb_clnt);
193
194 if (error < 0)
195 printk(KERN_WARNING "RPC: failed to contact local rpcbind "
196 "server (errno %d).\n", -error);
197 dprintk("RPC: registration status %d/%d\n", error, *result);
198
199 return error;
200}
201
Chuck Levera5090502007-03-29 16:48:04 -0400202/**
203 * rpcb_register - set or unset a port registration with the local rpcbind svc
204 * @prog: RPC program number to bind
205 * @vers: RPC version number to bind
Chuck Leverc2e1b092008-07-14 16:03:30 -0400206 * @prot: transport protocol to register
Chuck Levera5090502007-03-29 16:48:04 -0400207 * @port: port value to register
Chuck Leverc2e1b092008-07-14 16:03:30 -0400208 * @okay: OUT: result code
Chuck Levera5090502007-03-29 16:48:04 -0400209 *
Chuck Leverc2e1b092008-07-14 16:03:30 -0400210 * RPC services invoke this function to advertise their contact
211 * information via the system's rpcbind daemon. RPC services
212 * invoke this function once for each [program, version, transport]
213 * tuple they wish to advertise.
Chuck Levera5090502007-03-29 16:48:04 -0400214 *
Chuck Leverc2e1b092008-07-14 16:03:30 -0400215 * Callers may also unregister RPC services that are no longer
216 * available by setting the passed-in port to zero. This removes
217 * all registered transports for [program, version] from the local
218 * rpcbind database.
219 *
220 * Returns zero if the registration request was dispatched
221 * successfully and a reply was received. The rpcbind daemon's
222 * boolean result code is stored in *okay.
223 *
224 * Returns an errno value and sets *result to zero if there was
225 * some problem that prevented the rpcbind request from being
226 * dispatched, or if the rpcbind daemon did not respond within
227 * the timeout.
228 *
229 * This function uses rpcbind protocol version 2 to contact the
230 * local rpcbind daemon.
231 *
232 * Registration works over both AF_INET and AF_INET6, and services
233 * registered via this function are advertised as available for any
234 * address. If the local rpcbind daemon is listening on AF_INET6,
235 * services registered via this function will be advertised on
236 * IN6ADDR_ANY (ie available for all AF_INET and AF_INET6
237 * addresses).
Chuck Levera5090502007-03-29 16:48:04 -0400238 */
239int rpcb_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay)
240{
Chuck Levera5090502007-03-29 16:48:04 -0400241 struct rpcbind_args map = {
242 .r_prog = prog,
243 .r_vers = vers,
244 .r_prot = prot,
245 .r_port = port,
246 };
247 struct rpc_message msg = {
Chuck Levera5090502007-03-29 16:48:04 -0400248 .rpc_argp = &map,
249 .rpc_resp = okay,
250 };
Chuck Levera5090502007-03-29 16:48:04 -0400251
252 dprintk("RPC: %sregistering (%u, %u, %d, %u) with local "
253 "rpcbind\n", (port ? "" : "un"),
254 prog, vers, prot, port);
255
Chuck Leverbabe80e2008-07-14 16:03:29 -0400256 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_UNSET];
257 if (port)
258 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_SET];
259
260 return rpcb_register_call((struct sockaddr *)&rpcb_inaddr_loopback,
Chuck Levercc5598b2008-07-14 16:03:27 -0400261 sizeof(rpcb_inaddr_loopback),
Chuck Leverbabe80e2008-07-14 16:03:29 -0400262 RPCBVERS_2, &msg, okay);
Chuck Levera5090502007-03-29 16:48:04 -0400263}
264
Chuck Leverc2e1b092008-07-14 16:03:30 -0400265/*
266 * Fill in AF_INET family-specific arguments to register
267 */
268static int rpcb_register_netid4(struct sockaddr_in *address_to_register,
269 struct rpc_message *msg)
270{
271 struct rpcbind_args *map = msg->rpc_argp;
272 unsigned short port = ntohs(address_to_register->sin_port);
273 char buf[32];
274
275 /* Construct AF_INET universal address */
276 snprintf(buf, sizeof(buf),
277 NIPQUAD_FMT".%u.%u",
278 NIPQUAD(address_to_register->sin_addr.s_addr),
279 port >> 8, port & 0xff);
280 map->r_addr = buf;
281
282 dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with "
283 "local rpcbind\n", (port ? "" : "un"),
284 map->r_prog, map->r_vers,
285 map->r_addr, map->r_netid);
286
287 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
288 if (port)
289 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
290
291 return rpcb_register_call((struct sockaddr *)&rpcb_inaddr_loopback,
292 sizeof(rpcb_inaddr_loopback),
293 RPCBVERS_4, msg, msg->rpc_resp);
294}
295
296/*
297 * Fill in AF_INET6 family-specific arguments to register
298 */
299static int rpcb_register_netid6(struct sockaddr_in6 *address_to_register,
300 struct rpc_message *msg)
301{
302 struct rpcbind_args *map = msg->rpc_argp;
303 unsigned short port = ntohs(address_to_register->sin6_port);
304 char buf[64];
305
306 /* Construct AF_INET6 universal address */
307 snprintf(buf, sizeof(buf),
308 NIP6_FMT".%u.%u",
309 NIP6(address_to_register->sin6_addr),
310 port >> 8, port & 0xff);
311 map->r_addr = buf;
312
313 dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with "
314 "local rpcbind\n", (port ? "" : "un"),
315 map->r_prog, map->r_vers,
316 map->r_addr, map->r_netid);
317
318 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
319 if (port)
320 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
321
322 return rpcb_register_call((struct sockaddr *)&rpcb_in6addr_loopback,
323 sizeof(rpcb_in6addr_loopback),
324 RPCBVERS_4, msg, msg->rpc_resp);
325}
326
327/**
328 * rpcb_v4_register - set or unset a port registration with the local rpcbind
329 * @program: RPC program number of service to (un)register
330 * @version: RPC version number of service to (un)register
331 * @address: address family, IP address, and port to (un)register
332 * @netid: netid of transport protocol to (un)register
333 * @result: result code from rpcbind RPC call
334 *
335 * RPC services invoke this function to advertise their contact
336 * information via the system's rpcbind daemon. RPC services
337 * invoke this function once for each [program, version, address,
338 * netid] tuple they wish to advertise.
339 *
340 * Callers may also unregister RPC services that are no longer
341 * available by setting the port number in the passed-in address
342 * to zero. Callers pass a netid of "" to unregister all
343 * transport netids associated with [program, version, address].
344 *
345 * Returns zero if the registration request was dispatched
346 * successfully and a reply was received. The rpcbind daemon's
347 * result code is stored in *result.
348 *
349 * Returns an errno value and sets *result to zero if there was
350 * some problem that prevented the rpcbind request from being
351 * dispatched, or if the rpcbind daemon did not respond within
352 * the timeout.
353 *
354 * This function uses rpcbind protocol version 4 to contact the
355 * local rpcbind daemon. The local rpcbind daemon must support
356 * version 4 of the rpcbind protocol in order for these functions
357 * to register a service successfully.
358 *
359 * Supported netids include "udp" and "tcp" for UDP and TCP over
360 * IPv4, and "udp6" and "tcp6" for UDP and TCP over IPv6,
361 * respectively.
362 *
363 * The contents of @address determine the address family and the
364 * port to be registered. The usual practice is to pass INADDR_ANY
365 * as the raw address, but specifying a non-zero address is also
366 * supported by this API if the caller wishes to advertise an RPC
367 * service on a specific network interface.
368 *
369 * Note that passing in INADDR_ANY does not create the same service
370 * registration as IN6ADDR_ANY. The former advertises an RPC
371 * service on any IPv4 address, but not on IPv6. The latter
372 * advertises the service on all IPv4 and IPv6 addresses.
373 */
374int rpcb_v4_register(const u32 program, const u32 version,
375 const struct sockaddr *address, const char *netid,
376 int *result)
377{
378 struct rpcbind_args map = {
379 .r_prog = program,
380 .r_vers = version,
381 .r_netid = netid,
382 .r_owner = RPCB_OWNER_STRING,
383 };
384 struct rpc_message msg = {
385 .rpc_argp = &map,
386 .rpc_resp = result,
387 };
388
389 *result = 0;
390
391 switch (address->sa_family) {
392 case AF_INET:
393 return rpcb_register_netid4((struct sockaddr_in *)address,
394 &msg);
395 case AF_INET6:
396 return rpcb_register_netid6((struct sockaddr_in6 *)address,
397 &msg);
398 }
399
400 return -EAFNOSUPPORT;
401}
402
Chuck Levera5090502007-03-29 16:48:04 -0400403/**
Chuck Levercce63cd2007-07-01 12:13:12 -0400404 * rpcb_getport_sync - obtain the port for an RPC service on a given host
Chuck Levera5090502007-03-29 16:48:04 -0400405 * @sin: address of remote peer
406 * @prog: RPC program number to bind
407 * @vers: RPC version number to bind
408 * @prot: transport protocol to use to make this request
409 *
Chuck Lever67d60212008-01-14 15:12:01 -0500410 * Return value is the requested advertised port number,
411 * or a negative errno value.
412 *
Chuck Levera5090502007-03-29 16:48:04 -0400413 * Called from outside the RPC client in a synchronous task context.
Chuck Levercce63cd2007-07-01 12:13:12 -0400414 * Uses default timeout parameters specified by underlying transport.
Chuck Levera5090502007-03-29 16:48:04 -0400415 *
Chuck Lever67d60212008-01-14 15:12:01 -0500416 * XXX: Needs to support IPv6
Chuck Levera5090502007-03-29 16:48:04 -0400417 */
Chuck Leverf1ec08c2008-01-14 15:11:53 -0500418int rpcb_getport_sync(struct sockaddr_in *sin, u32 prog, u32 vers, int prot)
Chuck Levera5090502007-03-29 16:48:04 -0400419{
420 struct rpcbind_args map = {
421 .r_prog = prog,
422 .r_vers = vers,
423 .r_prot = prot,
424 .r_port = 0,
425 };
426 struct rpc_message msg = {
427 .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT],
428 .rpc_argp = &map,
429 .rpc_resp = &map.r_port,
430 };
431 struct rpc_clnt *rpcb_clnt;
Chuck Levera5090502007-03-29 16:48:04 -0400432 int status;
433
Chuck Levercce63cd2007-07-01 12:13:12 -0400434 dprintk("RPC: %s(" NIPQUAD_FMT ", %u, %u, %d)\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800435 __func__, NIPQUAD(sin->sin_addr.s_addr), prog, vers, prot);
Chuck Levera5090502007-03-29 16:48:04 -0400436
Chuck Leverb91e1012008-01-14 15:11:46 -0500437 rpcb_clnt = rpcb_create(NULL, (struct sockaddr *)sin,
Chuck Lever423d8b02008-07-14 16:03:28 -0400438 sizeof(*sin), prot, RPCBVERS_2);
Chuck Levera5090502007-03-29 16:48:04 -0400439 if (IS_ERR(rpcb_clnt))
440 return PTR_ERR(rpcb_clnt);
441
442 status = rpc_call_sync(rpcb_clnt, &msg, 0);
Trond Myklebust90c57552007-06-09 19:49:36 -0400443 rpc_shutdown_client(rpcb_clnt);
Chuck Levera5090502007-03-29 16:48:04 -0400444
445 if (status >= 0) {
446 if (map.r_port != 0)
447 return map.r_port;
448 status = -EACCES;
449 }
450 return status;
451}
Chuck Levercce63cd2007-07-01 12:13:12 -0400452EXPORT_SYMBOL_GPL(rpcb_getport_sync);
Chuck Levera5090502007-03-29 16:48:04 -0400453
Trond Myklebust803a9062008-07-01 15:20:55 -0400454static struct rpc_task *rpcb_call_async(struct rpc_clnt *rpcb_clnt, struct rpcbind_args *map, struct rpc_procinfo *proc)
Trond Myklebust5138fde2007-07-14 15:40:01 -0400455{
456 struct rpc_message msg = {
Trond Myklebust803a9062008-07-01 15:20:55 -0400457 .rpc_proc = proc,
Trond Myklebust5138fde2007-07-14 15:40:01 -0400458 .rpc_argp = map,
459 .rpc_resp = &map->r_port,
460 };
461 struct rpc_task_setup task_setup_data = {
462 .rpc_client = rpcb_clnt,
463 .rpc_message = &msg,
464 .callback_ops = &rpcb_getport_ops,
465 .callback_data = map,
466 .flags = RPC_TASK_ASYNC,
467 };
468
469 return rpc_run_task(&task_setup_data);
470}
471
Chuck Levera5090502007-03-29 16:48:04 -0400472/**
Chuck Lever45160d62007-07-01 12:13:17 -0400473 * rpcb_getport_async - obtain the port for a given RPC service on a given host
Chuck Levera5090502007-03-29 16:48:04 -0400474 * @task: task that is waiting for portmapper request
475 *
476 * This one can be called for an ongoing RPC request, and can be used in
477 * an async (rpciod) context.
478 */
Chuck Lever45160d62007-07-01 12:13:17 -0400479void rpcb_getport_async(struct rpc_task *task)
Chuck Levera5090502007-03-29 16:48:04 -0400480{
481 struct rpc_clnt *clnt = task->tk_client;
Trond Myklebust803a9062008-07-01 15:20:55 -0400482 struct rpc_procinfo *proc;
Chuck Lever0a48f5d2007-12-10 14:56:38 -0500483 u32 bind_version;
Chuck Levera5090502007-03-29 16:48:04 -0400484 struct rpc_xprt *xprt = task->tk_xprt;
485 struct rpc_clnt *rpcb_clnt;
486 static struct rpcbind_args *map;
487 struct rpc_task *child;
Chuck Lever9f6ad262007-12-10 14:56:31 -0500488 struct sockaddr_storage addr;
489 struct sockaddr *sap = (struct sockaddr *)&addr;
490 size_t salen;
Chuck Levera5090502007-03-29 16:48:04 -0400491 int status;
492
Chuck Lever45160d62007-07-01 12:13:17 -0400493 dprintk("RPC: %5u %s(%s, %u, %u, %d)\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800494 task->tk_pid, __func__,
Chuck Lever45160d62007-07-01 12:13:17 -0400495 clnt->cl_server, clnt->cl_prog, clnt->cl_vers, xprt->prot);
Chuck Levera5090502007-03-29 16:48:04 -0400496
497 /* Autobind on cloned rpc clients is discouraged */
498 BUG_ON(clnt->cl_parent != clnt);
499
Trond Myklebust381ba742008-07-07 12:18:53 -0400500 /* Put self on the wait queue to ensure we get notified if
501 * some other task is already attempting to bind the port */
502 rpc_sleep_on(&xprt->binding, task, NULL);
503
Chuck Levera5090502007-03-29 16:48:04 -0400504 if (xprt_test_and_set_binding(xprt)) {
Chuck Lever45160d62007-07-01 12:13:17 -0400505 dprintk("RPC: %5u %s: waiting for another binder\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800506 task->tk_pid, __func__);
Trond Myklebust381ba742008-07-07 12:18:53 -0400507 return;
Chuck Levera5090502007-03-29 16:48:04 -0400508 }
509
Chuck Levera5090502007-03-29 16:48:04 -0400510 /* Someone else may have bound if we slept */
511 if (xprt_bound(xprt)) {
512 status = 0;
Chuck Lever45160d62007-07-01 12:13:17 -0400513 dprintk("RPC: %5u %s: already bound\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800514 task->tk_pid, __func__);
Chuck Levera5090502007-03-29 16:48:04 -0400515 goto bailout_nofree;
516 }
517
Chuck Lever9f6ad262007-12-10 14:56:31 -0500518 salen = rpc_peeraddr(clnt, sap, sizeof(addr));
Chuck Leverd5b64432007-08-06 11:57:18 -0400519
520 /* Don't ever use rpcbind v2 for AF_INET6 requests */
Chuck Lever9f6ad262007-12-10 14:56:31 -0500521 switch (sap->sa_family) {
Chuck Leverd5b64432007-08-06 11:57:18 -0400522 case AF_INET:
Trond Myklebust803a9062008-07-01 15:20:55 -0400523 proc = rpcb_next_version[xprt->bind_index].rpc_proc;
524 bind_version = rpcb_next_version[xprt->bind_index].rpc_vers;
Chuck Leverd5b64432007-08-06 11:57:18 -0400525 break;
526 case AF_INET6:
Trond Myklebust803a9062008-07-01 15:20:55 -0400527 proc = rpcb_next_version6[xprt->bind_index].rpc_proc;
528 bind_version = rpcb_next_version6[xprt->bind_index].rpc_vers;
Chuck Leverd5b64432007-08-06 11:57:18 -0400529 break;
530 default:
531 status = -EAFNOSUPPORT;
532 dprintk("RPC: %5u %s: bad address family\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800533 task->tk_pid, __func__);
Chuck Leverd5b64432007-08-06 11:57:18 -0400534 goto bailout_nofree;
535 }
Trond Myklebust803a9062008-07-01 15:20:55 -0400536 if (proc == NULL) {
Chuck Levera5090502007-03-29 16:48:04 -0400537 xprt->bind_index = 0;
Chuck Lever906462a2007-09-11 18:00:47 -0400538 status = -EPFNOSUPPORT;
Chuck Lever45160d62007-07-01 12:13:17 -0400539 dprintk("RPC: %5u %s: no more getport versions available\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800540 task->tk_pid, __func__);
Chuck Levera5090502007-03-29 16:48:04 -0400541 goto bailout_nofree;
542 }
Chuck Levera5090502007-03-29 16:48:04 -0400543
Chuck Lever45160d62007-07-01 12:13:17 -0400544 dprintk("RPC: %5u %s: trying rpcbind version %u\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800545 task->tk_pid, __func__, bind_version);
Chuck Levera5090502007-03-29 16:48:04 -0400546
Chuck Lever9f6ad262007-12-10 14:56:31 -0500547 rpcb_clnt = rpcb_create(clnt->cl_server, sap, salen, xprt->prot,
Chuck Lever423d8b02008-07-14 16:03:28 -0400548 bind_version);
Chuck Lever143b6c42007-08-16 16:03:31 -0400549 if (IS_ERR(rpcb_clnt)) {
550 status = PTR_ERR(rpcb_clnt);
551 dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800552 task->tk_pid, __func__, PTR_ERR(rpcb_clnt));
Chuck Lever143b6c42007-08-16 16:03:31 -0400553 goto bailout_nofree;
554 }
555
Chuck Levera5090502007-03-29 16:48:04 -0400556 map = kzalloc(sizeof(struct rpcbind_args), GFP_ATOMIC);
557 if (!map) {
558 status = -ENOMEM;
Chuck Lever45160d62007-07-01 12:13:17 -0400559 dprintk("RPC: %5u %s: no memory available\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800560 task->tk_pid, __func__);
Chuck Levera5090502007-03-29 16:48:04 -0400561 goto bailout_nofree;
562 }
563 map->r_prog = clnt->cl_prog;
564 map->r_vers = clnt->cl_vers;
565 map->r_prot = xprt->prot;
566 map->r_port = 0;
567 map->r_xprt = xprt_get(xprt);
Trond Myklebust86d61d82008-01-07 21:16:56 -0500568 map->r_netid = rpc_peeraddr2str(clnt, RPC_DISPLAY_NETID);
569 map->r_addr = rpc_peeraddr2str(rpcb_clnt, RPC_DISPLAY_UNIVERSAL_ADDR);
Chuck Levera5090502007-03-29 16:48:04 -0400570 map->r_owner = RPCB_OWNER_STRING; /* ignored for GETADDR */
Trond Myklebust381ba742008-07-07 12:18:53 -0400571 map->r_status = -EIO;
Chuck Levera5090502007-03-29 16:48:04 -0400572
Trond Myklebust803a9062008-07-01 15:20:55 -0400573 child = rpcb_call_async(rpcb_clnt, map, proc);
Trond Myklebust4c402b42007-06-14 16:40:32 -0400574 rpc_release_client(rpcb_clnt);
Chuck Levera5090502007-03-29 16:48:04 -0400575 if (IS_ERR(child)) {
Trond Myklebust0d3a34b2008-07-07 12:18:52 -0400576 /* rpcb_map_release() has freed the arguments */
Chuck Lever45160d62007-07-01 12:13:17 -0400577 dprintk("RPC: %5u %s: rpc_run_task failed\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800578 task->tk_pid, __func__);
Trond Myklebust381ba742008-07-07 12:18:53 -0400579 return;
Chuck Levera5090502007-03-29 16:48:04 -0400580 }
581 rpc_put_task(child);
582
583 task->tk_xprt->stat.bind_count++;
584 return;
585
Chuck Levera5090502007-03-29 16:48:04 -0400586bailout_nofree:
587 rpcb_wake_rpcbind_waiters(xprt, status);
Chuck Levera5090502007-03-29 16:48:04 -0400588 task->tk_status = status;
589}
\"Talpey, Thomas\12444802007-09-10 13:45:36 -0400590EXPORT_SYMBOL_GPL(rpcb_getport_async);
Chuck Levera5090502007-03-29 16:48:04 -0400591
592/*
593 * Rpcbind child task calls this callback via tk_exit.
594 */
595static void rpcb_getport_done(struct rpc_task *child, void *data)
596{
597 struct rpcbind_args *map = data;
598 struct rpc_xprt *xprt = map->r_xprt;
599 int status = child->tk_status;
600
Chuck Lever4784cb52007-09-11 18:00:36 -0400601 /* Garbage reply: retry with a lesser rpcbind version */
602 if (status == -EIO)
603 status = -EPROTONOSUPPORT;
604
Chuck Levera5090502007-03-29 16:48:04 -0400605 /* rpcbind server doesn't support this rpcbind protocol version */
606 if (status == -EPROTONOSUPPORT)
607 xprt->bind_index++;
608
609 if (status < 0) {
610 /* rpcbind server not available on remote host? */
611 xprt->ops->set_port(xprt, 0);
612 } else if (map->r_port == 0) {
613 /* Requested RPC service wasn't registered on remote host */
614 xprt->ops->set_port(xprt, 0);
615 status = -EACCES;
616 } else {
617 /* Succeeded */
618 xprt->ops->set_port(xprt, map->r_port);
619 xprt_set_bound(xprt);
620 status = 0;
621 }
622
623 dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n",
624 child->tk_pid, status, map->r_port);
625
Trond Myklebust381ba742008-07-07 12:18:53 -0400626 map->r_status = status;
Chuck Levera5090502007-03-29 16:48:04 -0400627}
628
Chuck Lever166b88d2008-07-14 16:03:26 -0400629/*
630 * XDR functions for rpcbind
631 */
632
Chuck Levera5090502007-03-29 16:48:04 -0400633static int rpcb_encode_mapping(struct rpc_rqst *req, __be32 *p,
634 struct rpcbind_args *rpcb)
635{
636 dprintk("RPC: rpcb_encode_mapping(%u, %u, %d, %u)\n",
637 rpcb->r_prog, rpcb->r_vers, rpcb->r_prot, rpcb->r_port);
638 *p++ = htonl(rpcb->r_prog);
639 *p++ = htonl(rpcb->r_vers);
640 *p++ = htonl(rpcb->r_prot);
641 *p++ = htonl(rpcb->r_port);
642
643 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
644 return 0;
645}
646
647static int rpcb_decode_getport(struct rpc_rqst *req, __be32 *p,
648 unsigned short *portp)
649{
650 *portp = (unsigned short) ntohl(*p++);
Chuck Lever877fcf12008-06-25 17:24:23 -0400651 dprintk("RPC: rpcb_decode_getport result %u\n",
Chuck Levera5090502007-03-29 16:48:04 -0400652 *portp);
653 return 0;
654}
655
656static int rpcb_decode_set(struct rpc_rqst *req, __be32 *p,
657 unsigned int *boolp)
658{
659 *boolp = (unsigned int) ntohl(*p++);
Chuck Lever877fcf12008-06-25 17:24:23 -0400660 dprintk("RPC: rpcb_decode_set: call %s\n",
661 (*boolp ? "succeeded" : "failed"));
Chuck Levera5090502007-03-29 16:48:04 -0400662 return 0;
663}
664
665static int rpcb_encode_getaddr(struct rpc_rqst *req, __be32 *p,
666 struct rpcbind_args *rpcb)
667{
668 dprintk("RPC: rpcb_encode_getaddr(%u, %u, %s)\n",
669 rpcb->r_prog, rpcb->r_vers, rpcb->r_addr);
670 *p++ = htonl(rpcb->r_prog);
671 *p++ = htonl(rpcb->r_vers);
672
673 p = xdr_encode_string(p, rpcb->r_netid);
674 p = xdr_encode_string(p, rpcb->r_addr);
675 p = xdr_encode_string(p, rpcb->r_owner);
676
677 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
678
679 return 0;
680}
681
682static int rpcb_decode_getaddr(struct rpc_rqst *req, __be32 *p,
683 unsigned short *portp)
684{
685 char *addr;
Chuck Leveradc24df2007-08-06 11:56:31 -0400686 u32 addr_len;
687 int c, i, f, first, val;
Chuck Levera5090502007-03-29 16:48:04 -0400688
689 *portp = 0;
Chuck Leveradc24df2007-08-06 11:56:31 -0400690 addr_len = ntohl(*p++);
Chuck Levera5090502007-03-29 16:48:04 -0400691
Chuck Levere65fe392007-09-11 18:00:31 -0400692 /*
693 * Simple sanity check. The smallest possible universal
694 * address is an IPv4 address string containing 11 bytes.
695 */
Chuck Lever0fb2b7e2007-12-10 14:56:46 -0500696 if (addr_len < 11 || addr_len > RPCBIND_MAXUADDRLEN)
Chuck Levere65fe392007-09-11 18:00:31 -0400697 goto out_err;
Chuck Levera5090502007-03-29 16:48:04 -0400698
Chuck Levere65fe392007-09-11 18:00:31 -0400699 /*
700 * Start at the end and walk backwards until the first dot
701 * is encountered. When the second dot is found, we have
702 * both parts of the port number.
703 */
Chuck Levera5090502007-03-29 16:48:04 -0400704 addr = (char *)p;
705 val = 0;
706 first = 1;
707 f = 1;
708 for (i = addr_len - 1; i > 0; i--) {
709 c = addr[i];
710 if (c >= '0' && c <= '9') {
711 val += (c - '0') * f;
712 f *= 10;
713 } else if (c == '.') {
714 if (first) {
715 *portp = val;
716 val = first = 0;
717 f = 1;
718 } else {
719 *portp |= (val << 8);
720 break;
721 }
722 }
723 }
724
Chuck Levere65fe392007-09-11 18:00:31 -0400725 /*
726 * Simple sanity check. If we never saw a dot in the reply,
727 * then this was probably just garbage.
728 */
729 if (first)
730 goto out_err;
731
Chuck Levera5090502007-03-29 16:48:04 -0400732 dprintk("RPC: rpcb_decode_getaddr port=%u\n", *portp);
733 return 0;
Chuck Levere65fe392007-09-11 18:00:31 -0400734
735out_err:
736 dprintk("RPC: rpcbind server returned malformed reply\n");
737 return -EIO;
Chuck Levera5090502007-03-29 16:48:04 -0400738}
739
740#define RPCB_program_sz (1u)
741#define RPCB_version_sz (1u)
742#define RPCB_protocol_sz (1u)
743#define RPCB_port_sz (1u)
744#define RPCB_boolean_sz (1u)
745
\"Talpey, Thomas\4f40ee42007-09-10 13:42:38 -0400746#define RPCB_netid_sz (1+XDR_QUADLEN(RPCBIND_MAXNETIDLEN))
Chuck Lever0fb2b7e2007-12-10 14:56:46 -0500747#define RPCB_addr_sz (1+XDR_QUADLEN(RPCBIND_MAXUADDRLEN))
Chuck Levera5090502007-03-29 16:48:04 -0400748#define RPCB_ownerstring_sz (1+XDR_QUADLEN(RPCB_MAXOWNERLEN))
749
750#define RPCB_mappingargs_sz RPCB_program_sz+RPCB_version_sz+ \
751 RPCB_protocol_sz+RPCB_port_sz
752#define RPCB_getaddrargs_sz RPCB_program_sz+RPCB_version_sz+ \
753 RPCB_netid_sz+RPCB_addr_sz+ \
754 RPCB_ownerstring_sz
755
756#define RPCB_setres_sz RPCB_boolean_sz
757#define RPCB_getportres_sz RPCB_port_sz
758
759/*
760 * Note that RFC 1833 does not put any size restrictions on the
761 * address string returned by the remote rpcbind database.
762 */
763#define RPCB_getaddrres_sz RPCB_addr_sz
764
765#define PROC(proc, argtype, restype) \
766 [RPCBPROC_##proc] = { \
767 .p_proc = RPCBPROC_##proc, \
768 .p_encode = (kxdrproc_t) rpcb_encode_##argtype, \
769 .p_decode = (kxdrproc_t) rpcb_decode_##restype, \
770 .p_arglen = RPCB_##argtype##args_sz, \
771 .p_replen = RPCB_##restype##res_sz, \
772 .p_statidx = RPCBPROC_##proc, \
773 .p_timer = 0, \
774 .p_name = #proc, \
775 }
776
777/*
778 * Not all rpcbind procedures described in RFC 1833 are implemented
779 * since the Linux kernel RPC code requires only these.
780 */
781static struct rpc_procinfo rpcb_procedures2[] = {
782 PROC(SET, mapping, set),
783 PROC(UNSET, mapping, set),
Chuck Lever6a774052008-06-25 17:24:39 -0400784 PROC(GETPORT, mapping, getport),
Chuck Levera5090502007-03-29 16:48:04 -0400785};
786
787static struct rpc_procinfo rpcb_procedures3[] = {
Chuck Lever166b88d2008-07-14 16:03:26 -0400788 PROC(SET, getaddr, set),
789 PROC(UNSET, getaddr, set),
Chuck Levera5090502007-03-29 16:48:04 -0400790 PROC(GETADDR, getaddr, getaddr),
791};
792
793static struct rpc_procinfo rpcb_procedures4[] = {
Chuck Lever166b88d2008-07-14 16:03:26 -0400794 PROC(SET, getaddr, set),
795 PROC(UNSET, getaddr, set),
Chuck Lever88424132008-06-25 17:24:47 -0400796 PROC(GETADDR, getaddr, getaddr),
Chuck Levera5090502007-03-29 16:48:04 -0400797 PROC(GETVERSADDR, getaddr, getaddr),
798};
799
800static struct rpcb_info rpcb_next_version[] = {
Chuck Leverfc200e72008-06-25 17:24:31 -0400801 {
802 .rpc_vers = RPCBVERS_2,
803 .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT],
804 },
805 {
806 .rpc_proc = NULL,
807 },
Chuck Levera5090502007-03-29 16:48:04 -0400808};
809
Chuck Leverd5b64432007-08-06 11:57:18 -0400810static struct rpcb_info rpcb_next_version6[] = {
Chuck Leverfc200e72008-06-25 17:24:31 -0400811 {
812 .rpc_vers = RPCBVERS_4,
Chuck Lever88424132008-06-25 17:24:47 -0400813 .rpc_proc = &rpcb_procedures4[RPCBPROC_GETADDR],
Chuck Leverfc200e72008-06-25 17:24:31 -0400814 },
815 {
816 .rpc_vers = RPCBVERS_3,
817 .rpc_proc = &rpcb_procedures3[RPCBPROC_GETADDR],
818 },
Chuck Leverfc200e72008-06-25 17:24:31 -0400819 {
820 .rpc_proc = NULL,
821 },
Chuck Leverd5b64432007-08-06 11:57:18 -0400822};
823
Chuck Levera5090502007-03-29 16:48:04 -0400824static struct rpc_version rpcb_version2 = {
Chuck Leverfc200e72008-06-25 17:24:31 -0400825 .number = RPCBVERS_2,
Chuck Levera5090502007-03-29 16:48:04 -0400826 .nrprocs = RPCB_HIGHPROC_2,
827 .procs = rpcb_procedures2
828};
829
830static struct rpc_version rpcb_version3 = {
Chuck Leverfc200e72008-06-25 17:24:31 -0400831 .number = RPCBVERS_3,
Chuck Levera5090502007-03-29 16:48:04 -0400832 .nrprocs = RPCB_HIGHPROC_3,
833 .procs = rpcb_procedures3
834};
835
836static struct rpc_version rpcb_version4 = {
Chuck Leverfc200e72008-06-25 17:24:31 -0400837 .number = RPCBVERS_4,
Chuck Levera5090502007-03-29 16:48:04 -0400838 .nrprocs = RPCB_HIGHPROC_4,
839 .procs = rpcb_procedures4
840};
841
842static struct rpc_version *rpcb_version[] = {
843 NULL,
844 NULL,
845 &rpcb_version2,
846 &rpcb_version3,
847 &rpcb_version4
848};
849
850static struct rpc_stat rpcb_stats;
851
Adrian Bunk7f4adef2007-06-13 01:03:13 +0200852static struct rpc_program rpcb_program = {
Chuck Levera5090502007-03-29 16:48:04 -0400853 .name = "rpcbind",
854 .number = RPCBIND_PROGRAM,
855 .nrvers = ARRAY_SIZE(rpcb_version),
856 .version = rpcb_version,
857 .stats = &rpcb_stats,
858};