blob: b028a0ecd593771583ff7f2f45156b3af1324914 [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>
26
27#ifdef RPC_DEBUG
28# define RPCDBG_FACILITY RPCDBG_BIND
29#endif
30
31#define RPCBIND_PROGRAM (100000u)
32#define RPCBIND_PORT (111u)
33
34enum {
35 RPCBPROC_NULL,
36 RPCBPROC_SET,
37 RPCBPROC_UNSET,
38 RPCBPROC_GETPORT,
39 RPCBPROC_GETADDR = 3, /* alias for GETPORT */
40 RPCBPROC_DUMP,
41 RPCBPROC_CALLIT,
42 RPCBPROC_BCAST = 5, /* alias for CALLIT */
43 RPCBPROC_GETTIME,
44 RPCBPROC_UADDR2TADDR,
45 RPCBPROC_TADDR2UADDR,
46 RPCBPROC_GETVERSADDR,
47 RPCBPROC_INDIRECT,
48 RPCBPROC_GETADDRLIST,
49 RPCBPROC_GETSTAT,
50};
51
52#define RPCB_HIGHPROC_2 RPCBPROC_CALLIT
53#define RPCB_HIGHPROC_3 RPCBPROC_TADDR2UADDR
54#define RPCB_HIGHPROC_4 RPCBPROC_GETSTAT
55
56/*
57 * r_addr
58 *
59 * Quoting RFC 3530, section 2.2:
60 *
61 * For TCP over IPv4 and for UDP over IPv4, the format of r_addr is the
62 * US-ASCII string:
63 *
64 * h1.h2.h3.h4.p1.p2
65 *
66 * The prefix, "h1.h2.h3.h4", is the standard textual form for
67 * representing an IPv4 address, which is always four octets long.
68 * Assuming big-endian ordering, h1, h2, h3, and h4, are respectively,
69 * the first through fourth octets each converted to ASCII-decimal.
70 * Assuming big-endian ordering, p1 and p2 are, respectively, the first
71 * and second octets each converted to ASCII-decimal. For example, if a
72 * host, in big-endian order, has an address of 0x0A010307 and there is
73 * a service listening on, in big endian order, port 0x020F (decimal
74 * 527), then the complete universal address is "10.1.3.7.2.15".
75 *
76 * ...
77 *
78 * For TCP over IPv6 and for UDP over IPv6, the format of r_addr is the
79 * US-ASCII string:
80 *
81 * x1:x2:x3:x4:x5:x6:x7:x8.p1.p2
82 *
83 * The suffix "p1.p2" is the service port, and is computed the same way
84 * as with universal addresses for TCP and UDP over IPv4. The prefix,
85 * "x1:x2:x3:x4:x5:x6:x7:x8", is the standard textual form for
86 * representing an IPv6 address as defined in Section 2.2 of [RFC2373].
87 * Additionally, the two alternative forms specified in Section 2.2 of
88 * [RFC2373] are also acceptable.
89 *
90 * XXX: Currently this implementation does not explicitly convert the
91 * stored address to US-ASCII on non-ASCII systems.
92 */
93#define RPCB_MAXADDRLEN (128u)
94
95/*
Chuck Levera5090502007-03-29 16:48:04 -040096 * r_owner
97 *
98 * The "owner" is allowed to unset a service in the rpcbind database.
99 * We always use the following (arbitrary) fixed string.
100 */
101#define RPCB_OWNER_STRING "rpcb"
102#define RPCB_MAXOWNERLEN sizeof(RPCB_OWNER_STRING)
103
104static void rpcb_getport_done(struct rpc_task *, void *);
105extern struct rpc_program rpcb_program;
106
107struct rpcbind_args {
108 struct rpc_xprt * r_xprt;
109
110 u32 r_prog;
111 u32 r_vers;
112 u32 r_prot;
113 unsigned short r_port;
114 char * r_netid;
115 char r_addr[RPCB_MAXADDRLEN];
116 char * r_owner;
117};
118
119static struct rpc_procinfo rpcb_procedures2[];
120static struct rpc_procinfo rpcb_procedures3[];
121
Chuck Leverd5b64432007-08-06 11:57:18 -0400122struct rpcb_info {
Chuck Levera5090502007-03-29 16:48:04 -0400123 int rpc_vers;
124 struct rpc_procinfo * rpc_proc;
Chuck Leverd5b64432007-08-06 11:57:18 -0400125};
126
127static struct rpcb_info rpcb_next_version[];
128static struct rpcb_info rpcb_next_version6[];
Chuck Levera5090502007-03-29 16:48:04 -0400129
130static void rpcb_getport_prepare(struct rpc_task *task, void *calldata)
131{
132 struct rpcbind_args *map = calldata;
133 struct rpc_xprt *xprt = map->r_xprt;
134 struct rpc_message msg = {
135 .rpc_proc = rpcb_next_version[xprt->bind_index].rpc_proc,
136 .rpc_argp = map,
137 .rpc_resp = &map->r_port,
138 };
139
140 rpc_call_setup(task, &msg, 0);
141}
142
143static void rpcb_map_release(void *data)
144{
145 struct rpcbind_args *map = data;
146
147 xprt_put(map->r_xprt);
148 kfree(map);
149}
150
151static const struct rpc_call_ops rpcb_getport_ops = {
152 .rpc_call_prepare = rpcb_getport_prepare,
153 .rpc_call_done = rpcb_getport_done,
154 .rpc_release = rpcb_map_release,
155};
156
157static void rpcb_wake_rpcbind_waiters(struct rpc_xprt *xprt, int status)
158{
159 xprt_clear_binding(xprt);
160 rpc_wake_up_status(&xprt->binding, status);
161}
162
163static struct rpc_clnt *rpcb_create(char *hostname, struct sockaddr *srvaddr,
164 int proto, int version, int privileged)
165{
166 struct rpc_create_args args = {
167 .protocol = proto,
168 .address = srvaddr,
169 .addrsize = sizeof(struct sockaddr_in),
170 .servername = hostname,
171 .program = &rpcb_program,
172 .version = version,
173 .authflavor = RPC_AUTH_UNIX,
Chuck Leverf7fb5582007-07-01 12:13:07 -0400174 .flags = (RPC_CLNT_CREATE_NOPING |
175 RPC_CLNT_CREATE_INTR),
Chuck Levera5090502007-03-29 16:48:04 -0400176 };
177
Chuck Leverd5b64432007-08-06 11:57:18 -0400178 switch (srvaddr->sa_family) {
179 case AF_INET:
180 ((struct sockaddr_in *)srvaddr)->sin_port = htons(RPCBIND_PORT);
181 break;
182 case AF_INET6:
183 ((struct sockaddr_in6 *)srvaddr)->sin6_port = htons(RPCBIND_PORT);
184 break;
185 default:
186 return NULL;
187 }
188
Chuck Levera5090502007-03-29 16:48:04 -0400189 if (!privileged)
190 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
191 return rpc_create(&args);
192}
193
194/**
195 * rpcb_register - set or unset a port registration with the local rpcbind svc
196 * @prog: RPC program number to bind
197 * @vers: RPC version number to bind
198 * @prot: transport protocol to use to make this request
199 * @port: port value to register
200 * @okay: result code
201 *
202 * port == 0 means unregister, port != 0 means register.
203 *
204 * This routine supports only rpcbind version 2.
205 */
206int rpcb_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay)
207{
208 struct sockaddr_in sin = {
209 .sin_family = AF_INET,
210 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
211 };
212 struct rpcbind_args map = {
213 .r_prog = prog,
214 .r_vers = vers,
215 .r_prot = prot,
216 .r_port = port,
217 };
218 struct rpc_message msg = {
219 .rpc_proc = &rpcb_procedures2[port ?
220 RPCBPROC_SET : RPCBPROC_UNSET],
221 .rpc_argp = &map,
222 .rpc_resp = okay,
223 };
224 struct rpc_clnt *rpcb_clnt;
225 int error = 0;
226
227 dprintk("RPC: %sregistering (%u, %u, %d, %u) with local "
228 "rpcbind\n", (port ? "" : "un"),
229 prog, vers, prot, port);
230
231 rpcb_clnt = rpcb_create("localhost", (struct sockaddr *) &sin,
232 IPPROTO_UDP, 2, 1);
233 if (IS_ERR(rpcb_clnt))
234 return PTR_ERR(rpcb_clnt);
235
236 error = rpc_call_sync(rpcb_clnt, &msg, 0);
237
Trond Myklebust90c57552007-06-09 19:49:36 -0400238 rpc_shutdown_client(rpcb_clnt);
Chuck Levera5090502007-03-29 16:48:04 -0400239 if (error < 0)
240 printk(KERN_WARNING "RPC: failed to contact local rpcbind "
241 "server (errno %d).\n", -error);
242 dprintk("RPC: registration status %d/%d\n", error, *okay);
243
244 return error;
245}
246
Chuck Levera5090502007-03-29 16:48:04 -0400247/**
Chuck Levercce63cd2007-07-01 12:13:12 -0400248 * rpcb_getport_sync - obtain the port for an RPC service on a given host
Chuck Levera5090502007-03-29 16:48:04 -0400249 * @sin: address of remote peer
250 * @prog: RPC program number to bind
251 * @vers: RPC version number to bind
252 * @prot: transport protocol to use to make this request
253 *
254 * Called from outside the RPC client in a synchronous task context.
Chuck Levercce63cd2007-07-01 12:13:12 -0400255 * Uses default timeout parameters specified by underlying transport.
Chuck Levera5090502007-03-29 16:48:04 -0400256 *
Chuck Levercce63cd2007-07-01 12:13:12 -0400257 * XXX: Needs to support IPv6, and rpcbind versions 3 and 4
Chuck Levera5090502007-03-29 16:48:04 -0400258 */
Chuck Levercce63cd2007-07-01 12:13:12 -0400259int rpcb_getport_sync(struct sockaddr_in *sin, __u32 prog,
260 __u32 vers, int prot)
Chuck Levera5090502007-03-29 16:48:04 -0400261{
262 struct rpcbind_args map = {
263 .r_prog = prog,
264 .r_vers = vers,
265 .r_prot = prot,
266 .r_port = 0,
267 };
268 struct rpc_message msg = {
269 .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT],
270 .rpc_argp = &map,
271 .rpc_resp = &map.r_port,
272 };
273 struct rpc_clnt *rpcb_clnt;
274 char hostname[40];
275 int status;
276
Chuck Levercce63cd2007-07-01 12:13:12 -0400277 dprintk("RPC: %s(" NIPQUAD_FMT ", %u, %u, %d)\n",
278 __FUNCTION__, NIPQUAD(sin->sin_addr.s_addr), prog, vers, prot);
Chuck Levera5090502007-03-29 16:48:04 -0400279
Chuck Levercce63cd2007-07-01 12:13:12 -0400280 sprintf(hostname, NIPQUAD_FMT, NIPQUAD(sin->sin_addr.s_addr));
Chuck Levera5090502007-03-29 16:48:04 -0400281 rpcb_clnt = rpcb_create(hostname, (struct sockaddr *)sin, prot, 2, 0);
282 if (IS_ERR(rpcb_clnt))
283 return PTR_ERR(rpcb_clnt);
284
285 status = rpc_call_sync(rpcb_clnt, &msg, 0);
Trond Myklebust90c57552007-06-09 19:49:36 -0400286 rpc_shutdown_client(rpcb_clnt);
Chuck Levera5090502007-03-29 16:48:04 -0400287
288 if (status >= 0) {
289 if (map.r_port != 0)
290 return map.r_port;
291 status = -EACCES;
292 }
293 return status;
294}
Chuck Levercce63cd2007-07-01 12:13:12 -0400295EXPORT_SYMBOL_GPL(rpcb_getport_sync);
Chuck Levera5090502007-03-29 16:48:04 -0400296
297/**
Chuck Lever45160d62007-07-01 12:13:17 -0400298 * rpcb_getport_async - obtain the port for a given RPC service on a given host
Chuck Levera5090502007-03-29 16:48:04 -0400299 * @task: task that is waiting for portmapper request
300 *
301 * This one can be called for an ongoing RPC request, and can be used in
302 * an async (rpciod) context.
303 */
Chuck Lever45160d62007-07-01 12:13:17 -0400304void rpcb_getport_async(struct rpc_task *task)
Chuck Levera5090502007-03-29 16:48:04 -0400305{
306 struct rpc_clnt *clnt = task->tk_client;
307 int bind_version;
308 struct rpc_xprt *xprt = task->tk_xprt;
309 struct rpc_clnt *rpcb_clnt;
310 static struct rpcbind_args *map;
311 struct rpc_task *child;
312 struct sockaddr addr;
313 int status;
Chuck Leverd5b64432007-08-06 11:57:18 -0400314 struct rpcb_info *info;
Chuck Levera5090502007-03-29 16:48:04 -0400315
Chuck Lever45160d62007-07-01 12:13:17 -0400316 dprintk("RPC: %5u %s(%s, %u, %u, %d)\n",
317 task->tk_pid, __FUNCTION__,
318 clnt->cl_server, clnt->cl_prog, clnt->cl_vers, xprt->prot);
Chuck Levera5090502007-03-29 16:48:04 -0400319
320 /* Autobind on cloned rpc clients is discouraged */
321 BUG_ON(clnt->cl_parent != clnt);
322
323 if (xprt_test_and_set_binding(xprt)) {
Chuck Lever2429cbf2007-09-11 18:00:41 -0400324 status = -EAGAIN; /* tell caller to check again */
Chuck Lever45160d62007-07-01 12:13:17 -0400325 dprintk("RPC: %5u %s: waiting for another binder\n",
326 task->tk_pid, __FUNCTION__);
Chuck Levera5090502007-03-29 16:48:04 -0400327 goto bailout_nowake;
328 }
329
330 /* Put self on queue before sending rpcbind request, in case
331 * rpcb_getport_done completes before we return from rpc_run_task */
332 rpc_sleep_on(&xprt->binding, task, NULL, NULL);
333
334 /* Someone else may have bound if we slept */
335 if (xprt_bound(xprt)) {
336 status = 0;
Chuck Lever45160d62007-07-01 12:13:17 -0400337 dprintk("RPC: %5u %s: already bound\n",
338 task->tk_pid, __FUNCTION__);
Chuck Levera5090502007-03-29 16:48:04 -0400339 goto bailout_nofree;
340 }
341
Chuck Leverd5b64432007-08-06 11:57:18 -0400342 rpc_peeraddr(clnt, (void *)&addr, sizeof(addr));
343
344 /* Don't ever use rpcbind v2 for AF_INET6 requests */
345 switch (addr.sa_family) {
346 case AF_INET:
347 info = rpcb_next_version;
348 break;
349 case AF_INET6:
350 info = rpcb_next_version6;
351 break;
352 default:
353 status = -EAFNOSUPPORT;
354 dprintk("RPC: %5u %s: bad address family\n",
355 task->tk_pid, __FUNCTION__);
356 goto bailout_nofree;
357 }
358 if (info[xprt->bind_index].rpc_proc == NULL) {
Chuck Levera5090502007-03-29 16:48:04 -0400359 xprt->bind_index = 0;
Chuck Lever906462a2007-09-11 18:00:47 -0400360 status = -EPFNOSUPPORT;
Chuck Lever45160d62007-07-01 12:13:17 -0400361 dprintk("RPC: %5u %s: no more getport versions available\n",
362 task->tk_pid, __FUNCTION__);
Chuck Levera5090502007-03-29 16:48:04 -0400363 goto bailout_nofree;
364 }
Chuck Leverd5b64432007-08-06 11:57:18 -0400365 bind_version = info[xprt->bind_index].rpc_vers;
Chuck Levera5090502007-03-29 16:48:04 -0400366
Chuck Lever45160d62007-07-01 12:13:17 -0400367 dprintk("RPC: %5u %s: trying rpcbind version %u\n",
368 task->tk_pid, __FUNCTION__, bind_version);
Chuck Levera5090502007-03-29 16:48:04 -0400369
Chuck Lever143b6c42007-08-16 16:03:31 -0400370 rpcb_clnt = rpcb_create(clnt->cl_server, &addr, xprt->prot,
371 bind_version, 0);
372 if (IS_ERR(rpcb_clnt)) {
373 status = PTR_ERR(rpcb_clnt);
374 dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n",
375 task->tk_pid, __FUNCTION__, PTR_ERR(rpcb_clnt));
376 goto bailout_nofree;
377 }
378
Chuck Levera5090502007-03-29 16:48:04 -0400379 map = kzalloc(sizeof(struct rpcbind_args), GFP_ATOMIC);
380 if (!map) {
381 status = -ENOMEM;
Chuck Lever45160d62007-07-01 12:13:17 -0400382 dprintk("RPC: %5u %s: no memory available\n",
383 task->tk_pid, __FUNCTION__);
Chuck Levera5090502007-03-29 16:48:04 -0400384 goto bailout_nofree;
385 }
386 map->r_prog = clnt->cl_prog;
387 map->r_vers = clnt->cl_vers;
388 map->r_prot = xprt->prot;
389 map->r_port = 0;
390 map->r_xprt = xprt_get(xprt);
\"Talpey, Thomas\4f40ee42007-09-10 13:42:38 -0400391 map->r_netid = (xprt->prot == IPPROTO_TCP) ? RPCBIND_NETID_TCP :
392 RPCBIND_NETID_UDP;
Chuck Lever6d0aa062007-09-11 18:00:15 -0400393 memcpy(map->r_addr,
Chuck Lever143b6c42007-08-16 16:03:31 -0400394 rpc_peeraddr2str(rpcb_clnt, RPC_DISPLAY_UNIVERSAL_ADDR),
395 sizeof(map->r_addr));
Chuck Levera5090502007-03-29 16:48:04 -0400396 map->r_owner = RPCB_OWNER_STRING; /* ignored for GETADDR */
397
Chuck Levera5090502007-03-29 16:48:04 -0400398 child = rpc_run_task(rpcb_clnt, RPC_TASK_ASYNC, &rpcb_getport_ops, map);
Trond Myklebust4c402b42007-06-14 16:40:32 -0400399 rpc_release_client(rpcb_clnt);
Chuck Levera5090502007-03-29 16:48:04 -0400400 if (IS_ERR(child)) {
401 status = -EIO;
Chuck Lever45160d62007-07-01 12:13:17 -0400402 dprintk("RPC: %5u %s: rpc_run_task failed\n",
403 task->tk_pid, __FUNCTION__);
Chuck Lever143b6c42007-08-16 16:03:31 -0400404 goto bailout;
Chuck Levera5090502007-03-29 16:48:04 -0400405 }
406 rpc_put_task(child);
407
408 task->tk_xprt->stat.bind_count++;
409 return;
410
411bailout:
412 kfree(map);
413 xprt_put(xprt);
414bailout_nofree:
415 rpcb_wake_rpcbind_waiters(xprt, status);
416bailout_nowake:
417 task->tk_status = status;
418}
419
420/*
421 * Rpcbind child task calls this callback via tk_exit.
422 */
423static void rpcb_getport_done(struct rpc_task *child, void *data)
424{
425 struct rpcbind_args *map = data;
426 struct rpc_xprt *xprt = map->r_xprt;
427 int status = child->tk_status;
428
Chuck Lever4784cb52007-09-11 18:00:36 -0400429 /* Garbage reply: retry with a lesser rpcbind version */
430 if (status == -EIO)
431 status = -EPROTONOSUPPORT;
432
Chuck Levera5090502007-03-29 16:48:04 -0400433 /* rpcbind server doesn't support this rpcbind protocol version */
434 if (status == -EPROTONOSUPPORT)
435 xprt->bind_index++;
436
437 if (status < 0) {
438 /* rpcbind server not available on remote host? */
439 xprt->ops->set_port(xprt, 0);
440 } else if (map->r_port == 0) {
441 /* Requested RPC service wasn't registered on remote host */
442 xprt->ops->set_port(xprt, 0);
443 status = -EACCES;
444 } else {
445 /* Succeeded */
446 xprt->ops->set_port(xprt, map->r_port);
447 xprt_set_bound(xprt);
448 status = 0;
449 }
450
451 dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n",
452 child->tk_pid, status, map->r_port);
453
454 rpcb_wake_rpcbind_waiters(xprt, status);
455}
456
457static int rpcb_encode_mapping(struct rpc_rqst *req, __be32 *p,
458 struct rpcbind_args *rpcb)
459{
460 dprintk("RPC: rpcb_encode_mapping(%u, %u, %d, %u)\n",
461 rpcb->r_prog, rpcb->r_vers, rpcb->r_prot, rpcb->r_port);
462 *p++ = htonl(rpcb->r_prog);
463 *p++ = htonl(rpcb->r_vers);
464 *p++ = htonl(rpcb->r_prot);
465 *p++ = htonl(rpcb->r_port);
466
467 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
468 return 0;
469}
470
471static int rpcb_decode_getport(struct rpc_rqst *req, __be32 *p,
472 unsigned short *portp)
473{
474 *portp = (unsigned short) ntohl(*p++);
475 dprintk("RPC: rpcb_decode_getport result %u\n",
476 *portp);
477 return 0;
478}
479
480static int rpcb_decode_set(struct rpc_rqst *req, __be32 *p,
481 unsigned int *boolp)
482{
483 *boolp = (unsigned int) ntohl(*p++);
484 dprintk("RPC: rpcb_decode_set result %u\n",
485 *boolp);
486 return 0;
487}
488
489static int rpcb_encode_getaddr(struct rpc_rqst *req, __be32 *p,
490 struct rpcbind_args *rpcb)
491{
492 dprintk("RPC: rpcb_encode_getaddr(%u, %u, %s)\n",
493 rpcb->r_prog, rpcb->r_vers, rpcb->r_addr);
494 *p++ = htonl(rpcb->r_prog);
495 *p++ = htonl(rpcb->r_vers);
496
497 p = xdr_encode_string(p, rpcb->r_netid);
498 p = xdr_encode_string(p, rpcb->r_addr);
499 p = xdr_encode_string(p, rpcb->r_owner);
500
501 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
502
503 return 0;
504}
505
506static int rpcb_decode_getaddr(struct rpc_rqst *req, __be32 *p,
507 unsigned short *portp)
508{
509 char *addr;
Chuck Leveradc24df2007-08-06 11:56:31 -0400510 u32 addr_len;
511 int c, i, f, first, val;
Chuck Levera5090502007-03-29 16:48:04 -0400512
513 *portp = 0;
Chuck Leveradc24df2007-08-06 11:56:31 -0400514 addr_len = ntohl(*p++);
Chuck Levera5090502007-03-29 16:48:04 -0400515
Chuck Levere65fe392007-09-11 18:00:31 -0400516 /*
517 * Simple sanity check. The smallest possible universal
518 * address is an IPv4 address string containing 11 bytes.
519 */
520 if (addr_len < 11 || addr_len > RPCB_MAXADDRLEN)
521 goto out_err;
Chuck Levera5090502007-03-29 16:48:04 -0400522
Chuck Levere65fe392007-09-11 18:00:31 -0400523 /*
524 * Start at the end and walk backwards until the first dot
525 * is encountered. When the second dot is found, we have
526 * both parts of the port number.
527 */
Chuck Levera5090502007-03-29 16:48:04 -0400528 addr = (char *)p;
529 val = 0;
530 first = 1;
531 f = 1;
532 for (i = addr_len - 1; i > 0; i--) {
533 c = addr[i];
534 if (c >= '0' && c <= '9') {
535 val += (c - '0') * f;
536 f *= 10;
537 } else if (c == '.') {
538 if (first) {
539 *portp = val;
540 val = first = 0;
541 f = 1;
542 } else {
543 *portp |= (val << 8);
544 break;
545 }
546 }
547 }
548
Chuck Levere65fe392007-09-11 18:00:31 -0400549 /*
550 * Simple sanity check. If we never saw a dot in the reply,
551 * then this was probably just garbage.
552 */
553 if (first)
554 goto out_err;
555
Chuck Levera5090502007-03-29 16:48:04 -0400556 dprintk("RPC: rpcb_decode_getaddr port=%u\n", *portp);
557 return 0;
Chuck Levere65fe392007-09-11 18:00:31 -0400558
559out_err:
560 dprintk("RPC: rpcbind server returned malformed reply\n");
561 return -EIO;
Chuck Levera5090502007-03-29 16:48:04 -0400562}
563
564#define RPCB_program_sz (1u)
565#define RPCB_version_sz (1u)
566#define RPCB_protocol_sz (1u)
567#define RPCB_port_sz (1u)
568#define RPCB_boolean_sz (1u)
569
\"Talpey, Thomas\4f40ee42007-09-10 13:42:38 -0400570#define RPCB_netid_sz (1+XDR_QUADLEN(RPCBIND_MAXNETIDLEN))
Chuck Levera5090502007-03-29 16:48:04 -0400571#define RPCB_addr_sz (1+XDR_QUADLEN(RPCB_MAXADDRLEN))
572#define RPCB_ownerstring_sz (1+XDR_QUADLEN(RPCB_MAXOWNERLEN))
573
574#define RPCB_mappingargs_sz RPCB_program_sz+RPCB_version_sz+ \
575 RPCB_protocol_sz+RPCB_port_sz
576#define RPCB_getaddrargs_sz RPCB_program_sz+RPCB_version_sz+ \
577 RPCB_netid_sz+RPCB_addr_sz+ \
578 RPCB_ownerstring_sz
579
580#define RPCB_setres_sz RPCB_boolean_sz
581#define RPCB_getportres_sz RPCB_port_sz
582
583/*
584 * Note that RFC 1833 does not put any size restrictions on the
585 * address string returned by the remote rpcbind database.
586 */
587#define RPCB_getaddrres_sz RPCB_addr_sz
588
589#define PROC(proc, argtype, restype) \
590 [RPCBPROC_##proc] = { \
591 .p_proc = RPCBPROC_##proc, \
592 .p_encode = (kxdrproc_t) rpcb_encode_##argtype, \
593 .p_decode = (kxdrproc_t) rpcb_decode_##restype, \
594 .p_arglen = RPCB_##argtype##args_sz, \
595 .p_replen = RPCB_##restype##res_sz, \
596 .p_statidx = RPCBPROC_##proc, \
597 .p_timer = 0, \
598 .p_name = #proc, \
599 }
600
601/*
602 * Not all rpcbind procedures described in RFC 1833 are implemented
603 * since the Linux kernel RPC code requires only these.
604 */
605static struct rpc_procinfo rpcb_procedures2[] = {
606 PROC(SET, mapping, set),
607 PROC(UNSET, mapping, set),
608 PROC(GETADDR, mapping, getport),
609};
610
611static struct rpc_procinfo rpcb_procedures3[] = {
612 PROC(SET, mapping, set),
613 PROC(UNSET, mapping, set),
614 PROC(GETADDR, getaddr, getaddr),
615};
616
617static struct rpc_procinfo rpcb_procedures4[] = {
618 PROC(SET, mapping, set),
619 PROC(UNSET, mapping, set),
620 PROC(GETVERSADDR, getaddr, getaddr),
621};
622
623static struct rpcb_info rpcb_next_version[] = {
624#ifdef CONFIG_SUNRPC_BIND34
625 { 4, &rpcb_procedures4[RPCBPROC_GETVERSADDR] },
626 { 3, &rpcb_procedures3[RPCBPROC_GETADDR] },
627#endif
628 { 2, &rpcb_procedures2[RPCBPROC_GETPORT] },
629 { 0, NULL },
630};
631
Chuck Leverd5b64432007-08-06 11:57:18 -0400632static struct rpcb_info rpcb_next_version6[] = {
633#ifdef CONFIG_SUNRPC_BIND34
634 { 4, &rpcb_procedures4[RPCBPROC_GETVERSADDR] },
635 { 3, &rpcb_procedures3[RPCBPROC_GETADDR] },
636#endif
637 { 0, NULL },
638};
639
Chuck Levera5090502007-03-29 16:48:04 -0400640static struct rpc_version rpcb_version2 = {
641 .number = 2,
642 .nrprocs = RPCB_HIGHPROC_2,
643 .procs = rpcb_procedures2
644};
645
646static struct rpc_version rpcb_version3 = {
647 .number = 3,
648 .nrprocs = RPCB_HIGHPROC_3,
649 .procs = rpcb_procedures3
650};
651
652static struct rpc_version rpcb_version4 = {
653 .number = 4,
654 .nrprocs = RPCB_HIGHPROC_4,
655 .procs = rpcb_procedures4
656};
657
658static struct rpc_version *rpcb_version[] = {
659 NULL,
660 NULL,
661 &rpcb_version2,
662 &rpcb_version3,
663 &rpcb_version4
664};
665
666static struct rpc_stat rpcb_stats;
667
668struct rpc_program rpcb_program = {
669 .name = "rpcbind",
670 .number = RPCBIND_PROGRAM,
671 .nrvers = ARRAY_SIZE(rpcb_version),
672 .version = rpcb_version,
673 .stats = &rpcb_stats,
674};