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a509050b CL |
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 | ||
cce63cd6 CL |
15 | #include <linux/module.h> |
16 | ||
a509050b CL |
17 | #include <linux/types.h> |
18 | #include <linux/socket.h> | |
d5b64430 CL |
19 | #include <linux/in.h> |
20 | #include <linux/in6.h> | |
a509050b CL |
21 | #include <linux/kernel.h> |
22 | #include <linux/errno.h> | |
23 | ||
24 | #include <linux/sunrpc/clnt.h> | |
25 | #include <linux/sunrpc/sched.h> | |
0896a725 | 26 | #include <linux/sunrpc/xprtsock.h> |
a509050b CL |
27 | |
28 | #ifdef RPC_DEBUG | |
29 | # define RPCDBG_FACILITY RPCDBG_BIND | |
30 | #endif | |
31 | ||
32 | #define RPCBIND_PROGRAM (100000u) | |
33 | #define RPCBIND_PORT (111u) | |
34 | ||
fc200e79 CL |
35 | #define RPCBVERS_2 (2u) |
36 | #define RPCBVERS_3 (3u) | |
37 | #define RPCBVERS_4 (4u) | |
38 | ||
a509050b CL |
39 | enum { |
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 | ||
a509050b CL |
61 | /* |
62 | * 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 | ||
70 | static void rpcb_getport_done(struct rpc_task *, void *); | |
381ba74a | 71 | static void rpcb_map_release(void *data); |
7f4adeff | 72 | static struct rpc_program rpcb_program; |
a509050b CL |
73 | |
74 | struct 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; | |
86d61d86 TM |
81 | const char * r_netid; |
82 | const char * r_addr; | |
83 | const char * r_owner; | |
381ba74a TM |
84 | |
85 | int r_status; | |
a509050b CL |
86 | }; |
87 | ||
88 | static struct rpc_procinfo rpcb_procedures2[]; | |
89 | static struct rpc_procinfo rpcb_procedures3[]; | |
c2e1b09f | 90 | static struct rpc_procinfo rpcb_procedures4[]; |
a509050b | 91 | |
d5b64430 | 92 | struct rpcb_info { |
fc200e79 | 93 | u32 rpc_vers; |
a509050b | 94 | struct rpc_procinfo * rpc_proc; |
d5b64430 CL |
95 | }; |
96 | ||
97 | static struct rpcb_info rpcb_next_version[]; | |
98 | static struct rpcb_info rpcb_next_version6[]; | |
a509050b | 99 | |
a509050b | 100 | static const struct rpc_call_ops rpcb_getport_ops = { |
a509050b CL |
101 | .rpc_call_done = rpcb_getport_done, |
102 | .rpc_release = rpcb_map_release, | |
103 | }; | |
104 | ||
105 | static 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 | ||
381ba74a TM |
111 | static 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 | ||
cc5598b7 CL |
120 | static 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 | ||
c2e1b09f CL |
126 | static 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 | ||
cc5598b7 CL |
132 | static 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 | ||
a509050b | 149 | static struct rpc_clnt *rpcb_create(char *hostname, struct sockaddr *srvaddr, |
423d8b06 | 150 | size_t salen, int proto, u32 version) |
a509050b CL |
151 | { |
152 | struct rpc_create_args args = { | |
153 | .protocol = proto, | |
154 | .address = srvaddr, | |
9f6ad26d | 155 | .addrsize = salen, |
a509050b CL |
156 | .servername = hostname, |
157 | .program = &rpcb_program, | |
158 | .version = version, | |
159 | .authflavor = RPC_AUTH_UNIX, | |
423d8b06 CL |
160 | .flags = (RPC_CLNT_CREATE_NOPING | |
161 | RPC_CLNT_CREATE_NONPRIVPORT), | |
a509050b CL |
162 | }; |
163 | ||
d5b64430 CL |
164 | 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 | ||
a509050b CL |
175 | return rpc_create(&args); |
176 | } | |
177 | ||
babe80eb CL |
178 | static 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 | ||
a509050b CL |
202 | /** |
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 | |
c2e1b09f | 206 | * @prot: transport protocol to register |
a509050b | 207 | * @port: port value to register |
c2e1b09f CL |
208 | * @okay: OUT: result code |
209 | * | |
210 | * 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. | |
214 | * | |
215 | * 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. | |
a509050b | 223 | * |
c2e1b09f CL |
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. | |
a509050b | 228 | * |
c2e1b09f CL |
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). | |
a509050b CL |
238 | */ |
239 | int rpcb_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay) | |
240 | { | |
a509050b CL |
241 | 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 = { | |
a509050b CL |
248 | .rpc_argp = &map, |
249 | .rpc_resp = okay, | |
250 | }; | |
a509050b CL |
251 | |
252 | dprintk("RPC: %sregistering (%u, %u, %d, %u) with local " | |
253 | "rpcbind\n", (port ? "" : "un"), | |
254 | prog, vers, prot, port); | |
255 | ||
babe80eb CL |
256 | msg.rpc_proc = &rpcb_procedures2[RPCBPROC_UNSET]; |
257 | if (port) | |
258 | msg.rpc_proc = &rpcb_procedures2[RPCBPROC_SET]; | |
a509050b | 259 | |
babe80eb CL |
260 | return rpcb_register_call((struct sockaddr *)&rpcb_inaddr_loopback, |
261 | sizeof(rpcb_inaddr_loopback), | |
262 | RPCBVERS_2, &msg, okay); | |
a509050b CL |
263 | } |
264 | ||
c2e1b09f CL |
265 | /* |
266 | * Fill in AF_INET family-specific arguments to register | |
267 | */ | |
268 | static 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 | */ | |
299 | static 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 | */ | |
374 | int 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 | ||
a509050b | 403 | /** |
cce63cd6 | 404 | * rpcb_getport_sync - obtain the port for an RPC service on a given host |
a509050b CL |
405 | * @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 | * | |
67d60213 CL |
410 | * Return value is the requested advertised port number, |
411 | * or a negative errno value. | |
412 | * | |
a509050b | 413 | * Called from outside the RPC client in a synchronous task context. |
cce63cd6 | 414 | * Uses default timeout parameters specified by underlying transport. |
a509050b | 415 | * |
67d60213 | 416 | * XXX: Needs to support IPv6 |
a509050b | 417 | */ |
f1ec08cb | 418 | int rpcb_getport_sync(struct sockaddr_in *sin, u32 prog, u32 vers, int prot) |
a509050b CL |
419 | { |
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; | |
a509050b CL |
432 | int status; |
433 | ||
cce63cd6 | 434 | dprintk("RPC: %s(" NIPQUAD_FMT ", %u, %u, %d)\n", |
0dc47877 | 435 | __func__, NIPQUAD(sin->sin_addr.s_addr), prog, vers, prot); |
a509050b | 436 | |
b91e101f | 437 | rpcb_clnt = rpcb_create(NULL, (struct sockaddr *)sin, |
423d8b06 | 438 | sizeof(*sin), prot, RPCBVERS_2); |
a509050b CL |
439 | if (IS_ERR(rpcb_clnt)) |
440 | return PTR_ERR(rpcb_clnt); | |
441 | ||
442 | status = rpc_call_sync(rpcb_clnt, &msg, 0); | |
90c5755f | 443 | rpc_shutdown_client(rpcb_clnt); |
a509050b CL |
444 | |
445 | if (status >= 0) { | |
446 | if (map.r_port != 0) | |
447 | return map.r_port; | |
448 | status = -EACCES; | |
449 | } | |
450 | return status; | |
451 | } | |
cce63cd6 | 452 | EXPORT_SYMBOL_GPL(rpcb_getport_sync); |
a509050b | 453 | |
803a9067 | 454 | static struct rpc_task *rpcb_call_async(struct rpc_clnt *rpcb_clnt, struct rpcbind_args *map, struct rpc_procinfo *proc) |
5138fde0 TM |
455 | { |
456 | struct rpc_message msg = { | |
803a9067 | 457 | .rpc_proc = proc, |
5138fde0 TM |
458 | .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 | ||
a509050b | 472 | /** |
45160d62 | 473 | * rpcb_getport_async - obtain the port for a given RPC service on a given host |
a509050b CL |
474 | * @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 | */ | |
45160d62 | 479 | void rpcb_getport_async(struct rpc_task *task) |
a509050b CL |
480 | { |
481 | struct rpc_clnt *clnt = task->tk_client; | |
803a9067 | 482 | struct rpc_procinfo *proc; |
0a48f5d7 | 483 | u32 bind_version; |
a509050b CL |
484 | struct rpc_xprt *xprt = task->tk_xprt; |
485 | struct rpc_clnt *rpcb_clnt; | |
486 | static struct rpcbind_args *map; | |
487 | struct rpc_task *child; | |
9f6ad26d CL |
488 | struct sockaddr_storage addr; |
489 | struct sockaddr *sap = (struct sockaddr *)&addr; | |
490 | size_t salen; | |
a509050b CL |
491 | int status; |
492 | ||
45160d62 | 493 | dprintk("RPC: %5u %s(%s, %u, %u, %d)\n", |
0dc47877 | 494 | task->tk_pid, __func__, |
45160d62 | 495 | clnt->cl_server, clnt->cl_prog, clnt->cl_vers, xprt->prot); |
a509050b CL |
496 | |
497 | /* Autobind on cloned rpc clients is discouraged */ | |
498 | BUG_ON(clnt->cl_parent != clnt); | |
499 | ||
381ba74a TM |
500 | /* 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 | ||
a509050b | 504 | if (xprt_test_and_set_binding(xprt)) { |
45160d62 | 505 | dprintk("RPC: %5u %s: waiting for another binder\n", |
0dc47877 | 506 | task->tk_pid, __func__); |
381ba74a | 507 | return; |
a509050b CL |
508 | } |
509 | ||
a509050b CL |
510 | /* Someone else may have bound if we slept */ |
511 | if (xprt_bound(xprt)) { | |
512 | status = 0; | |
45160d62 | 513 | dprintk("RPC: %5u %s: already bound\n", |
0dc47877 | 514 | task->tk_pid, __func__); |
a509050b CL |
515 | goto bailout_nofree; |
516 | } | |
517 | ||
9f6ad26d | 518 | salen = rpc_peeraddr(clnt, sap, sizeof(addr)); |
d5b64430 CL |
519 | |
520 | /* Don't ever use rpcbind v2 for AF_INET6 requests */ | |
9f6ad26d | 521 | switch (sap->sa_family) { |
d5b64430 | 522 | case AF_INET: |
803a9067 TM |
523 | proc = rpcb_next_version[xprt->bind_index].rpc_proc; |
524 | bind_version = rpcb_next_version[xprt->bind_index].rpc_vers; | |
d5b64430 CL |
525 | break; |
526 | case AF_INET6: | |
803a9067 TM |
527 | proc = rpcb_next_version6[xprt->bind_index].rpc_proc; |
528 | bind_version = rpcb_next_version6[xprt->bind_index].rpc_vers; | |
d5b64430 CL |
529 | break; |
530 | default: | |
531 | status = -EAFNOSUPPORT; | |
532 | dprintk("RPC: %5u %s: bad address family\n", | |
0dc47877 | 533 | task->tk_pid, __func__); |
d5b64430 CL |
534 | goto bailout_nofree; |
535 | } | |
803a9067 | 536 | if (proc == NULL) { |
a509050b | 537 | xprt->bind_index = 0; |
906462af | 538 | status = -EPFNOSUPPORT; |
45160d62 | 539 | dprintk("RPC: %5u %s: no more getport versions available\n", |
0dc47877 | 540 | task->tk_pid, __func__); |
a509050b CL |
541 | goto bailout_nofree; |
542 | } | |
a509050b | 543 | |
45160d62 | 544 | dprintk("RPC: %5u %s: trying rpcbind version %u\n", |
0dc47877 | 545 | task->tk_pid, __func__, bind_version); |
a509050b | 546 | |
9f6ad26d | 547 | rpcb_clnt = rpcb_create(clnt->cl_server, sap, salen, xprt->prot, |
423d8b06 | 548 | bind_version); |
143b6c40 CL |
549 | if (IS_ERR(rpcb_clnt)) { |
550 | status = PTR_ERR(rpcb_clnt); | |
551 | dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n", | |
0dc47877 | 552 | task->tk_pid, __func__, PTR_ERR(rpcb_clnt)); |
143b6c40 CL |
553 | goto bailout_nofree; |
554 | } | |
555 | ||
a509050b CL |
556 | map = kzalloc(sizeof(struct rpcbind_args), GFP_ATOMIC); |
557 | if (!map) { | |
558 | status = -ENOMEM; | |
45160d62 | 559 | dprintk("RPC: %5u %s: no memory available\n", |
0dc47877 | 560 | task->tk_pid, __func__); |
a509050b CL |
561 | 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); | |
86d61d86 TM |
568 | map->r_netid = rpc_peeraddr2str(clnt, RPC_DISPLAY_NETID); |
569 | map->r_addr = rpc_peeraddr2str(rpcb_clnt, RPC_DISPLAY_UNIVERSAL_ADDR); | |
a509050b | 570 | map->r_owner = RPCB_OWNER_STRING; /* ignored for GETADDR */ |
381ba74a | 571 | map->r_status = -EIO; |
a509050b | 572 | |
803a9067 | 573 | child = rpcb_call_async(rpcb_clnt, map, proc); |
4c402b40 | 574 | rpc_release_client(rpcb_clnt); |
a509050b | 575 | if (IS_ERR(child)) { |
0d3a34b4 | 576 | /* rpcb_map_release() has freed the arguments */ |
45160d62 | 577 | dprintk("RPC: %5u %s: rpc_run_task failed\n", |
0dc47877 | 578 | task->tk_pid, __func__); |
381ba74a | 579 | return; |
a509050b CL |
580 | } |
581 | rpc_put_task(child); | |
582 | ||
583 | task->tk_xprt->stat.bind_count++; | |
584 | return; | |
585 | ||
a509050b CL |
586 | bailout_nofree: |
587 | rpcb_wake_rpcbind_waiters(xprt, status); | |
a509050b CL |
588 | task->tk_status = status; |
589 | } | |
12444809 | 590 | EXPORT_SYMBOL_GPL(rpcb_getport_async); |
a509050b CL |
591 | |
592 | /* | |
593 | * Rpcbind child task calls this callback via tk_exit. | |
594 | */ | |
595 | static 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 | ||
4784cb51 CL |
601 | /* Garbage reply: retry with a lesser rpcbind version */ |
602 | if (status == -EIO) | |
603 | status = -EPROTONOSUPPORT; | |
604 | ||
a509050b CL |
605 | /* 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 | ||
381ba74a | 626 | map->r_status = status; |
a509050b CL |
627 | } |
628 | ||
166b88d7 CL |
629 | /* |
630 | * XDR functions for rpcbind | |
631 | */ | |
632 | ||
a509050b CL |
633 | static 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 | ||
647 | static int rpcb_decode_getport(struct rpc_rqst *req, __be32 *p, | |
648 | unsigned short *portp) | |
649 | { | |
650 | *portp = (unsigned short) ntohl(*p++); | |
877fcf10 | 651 | dprintk("RPC: rpcb_decode_getport result %u\n", |
a509050b CL |
652 | *portp); |
653 | return 0; | |
654 | } | |
655 | ||
656 | static int rpcb_decode_set(struct rpc_rqst *req, __be32 *p, | |
657 | unsigned int *boolp) | |
658 | { | |
659 | *boolp = (unsigned int) ntohl(*p++); | |
877fcf10 CL |
660 | dprintk("RPC: rpcb_decode_set: call %s\n", |
661 | (*boolp ? "succeeded" : "failed")); | |
a509050b CL |
662 | return 0; |
663 | } | |
664 | ||
665 | static 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 | ||
682 | static int rpcb_decode_getaddr(struct rpc_rqst *req, __be32 *p, | |
683 | unsigned short *portp) | |
684 | { | |
685 | char *addr; | |
adc24df8 CL |
686 | u32 addr_len; |
687 | int c, i, f, first, val; | |
a509050b CL |
688 | |
689 | *portp = 0; | |
adc24df8 | 690 | addr_len = ntohl(*p++); |
a509050b | 691 | |
e65fe397 CL |
692 | /* |
693 | * Simple sanity check. The smallest possible universal | |
694 | * address is an IPv4 address string containing 11 bytes. | |
695 | */ | |
0fb2b7e9 | 696 | if (addr_len < 11 || addr_len > RPCBIND_MAXUADDRLEN) |
e65fe397 CL |
697 | goto out_err; |
698 | ||
699 | /* | |
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 | */ | |
a509050b CL |
704 | 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 | ||
e65fe397 CL |
725 | /* |
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 | ||
a509050b CL |
732 | dprintk("RPC: rpcb_decode_getaddr port=%u\n", *portp); |
733 | return 0; | |
e65fe397 CL |
734 | |
735 | out_err: | |
736 | dprintk("RPC: rpcbind server returned malformed reply\n"); | |
737 | return -EIO; | |
a509050b CL |
738 | } |
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 | ||
4f40ee4a | 746 | #define RPCB_netid_sz (1+XDR_QUADLEN(RPCBIND_MAXNETIDLEN)) |
0fb2b7e9 | 747 | #define RPCB_addr_sz (1+XDR_QUADLEN(RPCBIND_MAXUADDRLEN)) |
a509050b CL |
748 | #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 | */ | |
781 | static struct rpc_procinfo rpcb_procedures2[] = { | |
782 | PROC(SET, mapping, set), | |
783 | PROC(UNSET, mapping, set), | |
6a774051 | 784 | PROC(GETPORT, mapping, getport), |
a509050b CL |
785 | }; |
786 | ||
787 | static struct rpc_procinfo rpcb_procedures3[] = { | |
166b88d7 CL |
788 | PROC(SET, getaddr, set), |
789 | PROC(UNSET, getaddr, set), | |
a509050b CL |
790 | PROC(GETADDR, getaddr, getaddr), |
791 | }; | |
792 | ||
793 | static struct rpc_procinfo rpcb_procedures4[] = { | |
166b88d7 CL |
794 | PROC(SET, getaddr, set), |
795 | PROC(UNSET, getaddr, set), | |
8842413a | 796 | PROC(GETADDR, getaddr, getaddr), |
a509050b CL |
797 | PROC(GETVERSADDR, getaddr, getaddr), |
798 | }; | |
799 | ||
800 | static struct rpcb_info rpcb_next_version[] = { | |
fc200e79 CL |
801 | { |
802 | .rpc_vers = RPCBVERS_2, | |
803 | .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT], | |
804 | }, | |
805 | { | |
806 | .rpc_proc = NULL, | |
807 | }, | |
a509050b CL |
808 | }; |
809 | ||
d5b64430 | 810 | static struct rpcb_info rpcb_next_version6[] = { |
fc200e79 CL |
811 | { |
812 | .rpc_vers = RPCBVERS_4, | |
8842413a | 813 | .rpc_proc = &rpcb_procedures4[RPCBPROC_GETADDR], |
fc200e79 CL |
814 | }, |
815 | { | |
816 | .rpc_vers = RPCBVERS_3, | |
817 | .rpc_proc = &rpcb_procedures3[RPCBPROC_GETADDR], | |
818 | }, | |
fc200e79 CL |
819 | { |
820 | .rpc_proc = NULL, | |
821 | }, | |
d5b64430 CL |
822 | }; |
823 | ||
a509050b | 824 | static struct rpc_version rpcb_version2 = { |
fc200e79 | 825 | .number = RPCBVERS_2, |
a509050b CL |
826 | .nrprocs = RPCB_HIGHPROC_2, |
827 | .procs = rpcb_procedures2 | |
828 | }; | |
829 | ||
830 | static struct rpc_version rpcb_version3 = { | |
fc200e79 | 831 | .number = RPCBVERS_3, |
a509050b CL |
832 | .nrprocs = RPCB_HIGHPROC_3, |
833 | .procs = rpcb_procedures3 | |
834 | }; | |
835 | ||
836 | static struct rpc_version rpcb_version4 = { | |
fc200e79 | 837 | .number = RPCBVERS_4, |
a509050b CL |
838 | .nrprocs = RPCB_HIGHPROC_4, |
839 | .procs = rpcb_procedures4 | |
840 | }; | |
841 | ||
842 | static struct rpc_version *rpcb_version[] = { | |
843 | NULL, | |
844 | NULL, | |
845 | &rpcb_version2, | |
846 | &rpcb_version3, | |
847 | &rpcb_version4 | |
848 | }; | |
849 | ||
850 | static struct rpc_stat rpcb_stats; | |
851 | ||
7f4adeff | 852 | static struct rpc_program rpcb_program = { |
a509050b CL |
853 | .name = "rpcbind", |
854 | .number = RPCBIND_PROGRAM, | |
855 | .nrvers = ARRAY_SIZE(rpcb_version), | |
856 | .version = rpcb_version, | |
857 | .stats = &rpcb_stats, | |
858 | }; |