]>
Commit | Line | Data |
---|---|---|
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> | |
9d548b9c | 23 | #include <net/ipv6.h> |
a509050b CL |
24 | |
25 | #include <linux/sunrpc/clnt.h> | |
26 | #include <linux/sunrpc/sched.h> | |
0896a725 | 27 | #include <linux/sunrpc/xprtsock.h> |
a509050b CL |
28 | |
29 | #ifdef RPC_DEBUG | |
30 | # define RPCDBG_FACILITY RPCDBG_BIND | |
31 | #endif | |
32 | ||
33 | #define RPCBIND_PROGRAM (100000u) | |
34 | #define RPCBIND_PORT (111u) | |
35 | ||
fc200e79 CL |
36 | #define RPCBVERS_2 (2u) |
37 | #define RPCBVERS_3 (3u) | |
38 | #define RPCBVERS_4 (4u) | |
39 | ||
a509050b CL |
40 | enum { |
41 | RPCBPROC_NULL, | |
42 | RPCBPROC_SET, | |
43 | RPCBPROC_UNSET, | |
44 | RPCBPROC_GETPORT, | |
45 | RPCBPROC_GETADDR = 3, /* alias for GETPORT */ | |
46 | RPCBPROC_DUMP, | |
47 | RPCBPROC_CALLIT, | |
48 | RPCBPROC_BCAST = 5, /* alias for CALLIT */ | |
49 | RPCBPROC_GETTIME, | |
50 | RPCBPROC_UADDR2TADDR, | |
51 | RPCBPROC_TADDR2UADDR, | |
52 | RPCBPROC_GETVERSADDR, | |
53 | RPCBPROC_INDIRECT, | |
54 | RPCBPROC_GETADDRLIST, | |
55 | RPCBPROC_GETSTAT, | |
56 | }; | |
57 | ||
58 | #define RPCB_HIGHPROC_2 RPCBPROC_CALLIT | |
59 | #define RPCB_HIGHPROC_3 RPCBPROC_TADDR2UADDR | |
60 | #define RPCB_HIGHPROC_4 RPCBPROC_GETSTAT | |
61 | ||
a509050b CL |
62 | /* |
63 | * r_owner | |
64 | * | |
65 | * The "owner" is allowed to unset a service in the rpcbind database. | |
66 | * We always use the following (arbitrary) fixed string. | |
67 | */ | |
68 | #define RPCB_OWNER_STRING "rpcb" | |
69 | #define RPCB_MAXOWNERLEN sizeof(RPCB_OWNER_STRING) | |
70 | ||
71 | static void rpcb_getport_done(struct rpc_task *, void *); | |
381ba74a | 72 | static void rpcb_map_release(void *data); |
7f4adeff | 73 | static struct rpc_program rpcb_program; |
a509050b CL |
74 | |
75 | struct rpcbind_args { | |
76 | struct rpc_xprt * r_xprt; | |
77 | ||
78 | u32 r_prog; | |
79 | u32 r_vers; | |
80 | u32 r_prot; | |
81 | unsigned short r_port; | |
86d61d86 TM |
82 | const char * r_netid; |
83 | const char * r_addr; | |
84 | const char * r_owner; | |
381ba74a TM |
85 | |
86 | int r_status; | |
a509050b CL |
87 | }; |
88 | ||
89 | static struct rpc_procinfo rpcb_procedures2[]; | |
90 | static struct rpc_procinfo rpcb_procedures3[]; | |
c2e1b09f | 91 | static struct rpc_procinfo rpcb_procedures4[]; |
a509050b | 92 | |
d5b64430 | 93 | struct rpcb_info { |
fc200e79 | 94 | u32 rpc_vers; |
a509050b | 95 | struct rpc_procinfo * rpc_proc; |
d5b64430 CL |
96 | }; |
97 | ||
98 | static struct rpcb_info rpcb_next_version[]; | |
99 | static struct rpcb_info rpcb_next_version6[]; | |
a509050b | 100 | |
a509050b | 101 | static const struct rpc_call_ops rpcb_getport_ops = { |
a509050b CL |
102 | .rpc_call_done = rpcb_getport_done, |
103 | .rpc_release = rpcb_map_release, | |
104 | }; | |
105 | ||
106 | static void rpcb_wake_rpcbind_waiters(struct rpc_xprt *xprt, int status) | |
107 | { | |
108 | xprt_clear_binding(xprt); | |
109 | rpc_wake_up_status(&xprt->binding, status); | |
110 | } | |
111 | ||
381ba74a TM |
112 | static void rpcb_map_release(void *data) |
113 | { | |
114 | struct rpcbind_args *map = data; | |
115 | ||
116 | rpcb_wake_rpcbind_waiters(map->r_xprt, map->r_status); | |
117 | xprt_put(map->r_xprt); | |
118 | kfree(map); | |
119 | } | |
120 | ||
cc5598b7 CL |
121 | static const struct sockaddr_in rpcb_inaddr_loopback = { |
122 | .sin_family = AF_INET, | |
123 | .sin_addr.s_addr = htonl(INADDR_LOOPBACK), | |
124 | .sin_port = htons(RPCBIND_PORT), | |
125 | }; | |
126 | ||
c2e1b09f CL |
127 | static const struct sockaddr_in6 rpcb_in6addr_loopback = { |
128 | .sin6_family = AF_INET6, | |
129 | .sin6_addr = IN6ADDR_LOOPBACK_INIT, | |
130 | .sin6_port = htons(RPCBIND_PORT), | |
131 | }; | |
132 | ||
cc5598b7 CL |
133 | static struct rpc_clnt *rpcb_create_local(struct sockaddr *addr, |
134 | size_t addrlen, u32 version) | |
135 | { | |
136 | struct rpc_create_args args = { | |
137 | .protocol = XPRT_TRANSPORT_UDP, | |
138 | .address = addr, | |
139 | .addrsize = addrlen, | |
140 | .servername = "localhost", | |
141 | .program = &rpcb_program, | |
142 | .version = version, | |
143 | .authflavor = RPC_AUTH_UNIX, | |
144 | .flags = RPC_CLNT_CREATE_NOPING, | |
145 | }; | |
146 | ||
147 | return rpc_create(&args); | |
148 | } | |
149 | ||
a509050b | 150 | static struct rpc_clnt *rpcb_create(char *hostname, struct sockaddr *srvaddr, |
423d8b06 | 151 | size_t salen, int proto, u32 version) |
a509050b CL |
152 | { |
153 | struct rpc_create_args args = { | |
154 | .protocol = proto, | |
155 | .address = srvaddr, | |
9f6ad26d | 156 | .addrsize = salen, |
a509050b CL |
157 | .servername = hostname, |
158 | .program = &rpcb_program, | |
159 | .version = version, | |
160 | .authflavor = RPC_AUTH_UNIX, | |
423d8b06 CL |
161 | .flags = (RPC_CLNT_CREATE_NOPING | |
162 | RPC_CLNT_CREATE_NONPRIVPORT), | |
a509050b CL |
163 | }; |
164 | ||
d5b64430 CL |
165 | switch (srvaddr->sa_family) { |
166 | case AF_INET: | |
167 | ((struct sockaddr_in *)srvaddr)->sin_port = htons(RPCBIND_PORT); | |
168 | break; | |
169 | case AF_INET6: | |
170 | ((struct sockaddr_in6 *)srvaddr)->sin6_port = htons(RPCBIND_PORT); | |
171 | break; | |
172 | default: | |
173 | return NULL; | |
174 | } | |
175 | ||
a509050b CL |
176 | return rpc_create(&args); |
177 | } | |
178 | ||
babe80eb | 179 | static int rpcb_register_call(struct sockaddr *addr, size_t addrlen, |
14aeb211 | 180 | u32 version, struct rpc_message *msg) |
babe80eb CL |
181 | { |
182 | struct rpc_clnt *rpcb_clnt; | |
14aeb211 | 183 | int result, error = 0; |
babe80eb | 184 | |
14aeb211 | 185 | msg->rpc_resp = &result; |
babe80eb CL |
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 | ||
14aeb211 | 194 | if (error < 0) { |
babe80eb CL |
195 | printk(KERN_WARNING "RPC: failed to contact local rpcbind " |
196 | "server (errno %d).\n", -error); | |
14aeb211 CL |
197 | return error; |
198 | } | |
199 | ||
200 | if (!result) { | |
201 | dprintk("RPC: registration failed\n"); | |
202 | return -EACCES; | |
203 | } | |
babe80eb | 204 | |
14aeb211 CL |
205 | dprintk("RPC: registration succeeded\n"); |
206 | return 0; | |
babe80eb CL |
207 | } |
208 | ||
a509050b CL |
209 | /** |
210 | * rpcb_register - set or unset a port registration with the local rpcbind svc | |
211 | * @prog: RPC program number to bind | |
212 | * @vers: RPC version number to bind | |
c2e1b09f | 213 | * @prot: transport protocol to register |
a509050b | 214 | * @port: port value to register |
14aeb211 CL |
215 | * |
216 | * Returns zero if the registration request was dispatched successfully | |
217 | * and the rpcbind daemon returned success. Otherwise, returns an errno | |
218 | * value that reflects the nature of the error (request could not be | |
219 | * dispatched, timed out, or rpcbind returned an error). | |
c2e1b09f CL |
220 | * |
221 | * RPC services invoke this function to advertise their contact | |
222 | * information via the system's rpcbind daemon. RPC services | |
223 | * invoke this function once for each [program, version, transport] | |
224 | * tuple they wish to advertise. | |
225 | * | |
226 | * Callers may also unregister RPC services that are no longer | |
227 | * available by setting the passed-in port to zero. This removes | |
228 | * all registered transports for [program, version] from the local | |
229 | * rpcbind database. | |
230 | * | |
c2e1b09f CL |
231 | * This function uses rpcbind protocol version 2 to contact the |
232 | * local rpcbind daemon. | |
233 | * | |
234 | * Registration works over both AF_INET and AF_INET6, and services | |
235 | * registered via this function are advertised as available for any | |
236 | * address. If the local rpcbind daemon is listening on AF_INET6, | |
237 | * services registered via this function will be advertised on | |
238 | * IN6ADDR_ANY (ie available for all AF_INET and AF_INET6 | |
239 | * addresses). | |
a509050b | 240 | */ |
14aeb211 | 241 | int rpcb_register(u32 prog, u32 vers, int prot, unsigned short port) |
a509050b | 242 | { |
a509050b CL |
243 | struct rpcbind_args map = { |
244 | .r_prog = prog, | |
245 | .r_vers = vers, | |
246 | .r_prot = prot, | |
247 | .r_port = port, | |
248 | }; | |
249 | struct rpc_message msg = { | |
a509050b | 250 | .rpc_argp = &map, |
a509050b | 251 | }; |
a509050b CL |
252 | |
253 | dprintk("RPC: %sregistering (%u, %u, %d, %u) with local " | |
254 | "rpcbind\n", (port ? "" : "un"), | |
255 | prog, vers, prot, port); | |
256 | ||
babe80eb CL |
257 | msg.rpc_proc = &rpcb_procedures2[RPCBPROC_UNSET]; |
258 | if (port) | |
259 | msg.rpc_proc = &rpcb_procedures2[RPCBPROC_SET]; | |
a509050b | 260 | |
babe80eb CL |
261 | return rpcb_register_call((struct sockaddr *)&rpcb_inaddr_loopback, |
262 | sizeof(rpcb_inaddr_loopback), | |
14aeb211 | 263 | RPCBVERS_2, &msg); |
a509050b CL |
264 | } |
265 | ||
c2e1b09f CL |
266 | /* |
267 | * Fill in AF_INET family-specific arguments to register | |
268 | */ | |
269 | static int rpcb_register_netid4(struct sockaddr_in *address_to_register, | |
270 | struct rpc_message *msg) | |
271 | { | |
272 | struct rpcbind_args *map = msg->rpc_argp; | |
273 | unsigned short port = ntohs(address_to_register->sin_port); | |
274 | char buf[32]; | |
275 | ||
276 | /* Construct AF_INET universal address */ | |
277 | snprintf(buf, sizeof(buf), | |
278 | NIPQUAD_FMT".%u.%u", | |
279 | NIPQUAD(address_to_register->sin_addr.s_addr), | |
280 | port >> 8, port & 0xff); | |
281 | map->r_addr = buf; | |
282 | ||
283 | dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with " | |
284 | "local rpcbind\n", (port ? "" : "un"), | |
285 | map->r_prog, map->r_vers, | |
286 | map->r_addr, map->r_netid); | |
287 | ||
288 | msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET]; | |
289 | if (port) | |
290 | msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET]; | |
291 | ||
292 | return rpcb_register_call((struct sockaddr *)&rpcb_inaddr_loopback, | |
293 | sizeof(rpcb_inaddr_loopback), | |
14aeb211 | 294 | RPCBVERS_4, msg); |
c2e1b09f CL |
295 | } |
296 | ||
297 | /* | |
298 | * Fill in AF_INET6 family-specific arguments to register | |
299 | */ | |
300 | static int rpcb_register_netid6(struct sockaddr_in6 *address_to_register, | |
301 | struct rpc_message *msg) | |
302 | { | |
303 | struct rpcbind_args *map = msg->rpc_argp; | |
304 | unsigned short port = ntohs(address_to_register->sin6_port); | |
305 | char buf[64]; | |
306 | ||
307 | /* Construct AF_INET6 universal address */ | |
9d548b9c CL |
308 | if (ipv6_addr_any(&address_to_register->sin6_addr)) |
309 | snprintf(buf, sizeof(buf), "::.%u.%u", | |
310 | port >> 8, port & 0xff); | |
311 | else | |
312 | snprintf(buf, sizeof(buf), NIP6_FMT".%u.%u", | |
313 | NIP6(address_to_register->sin6_addr), | |
314 | port >> 8, port & 0xff); | |
c2e1b09f CL |
315 | map->r_addr = buf; |
316 | ||
317 | dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with " | |
318 | "local rpcbind\n", (port ? "" : "un"), | |
319 | map->r_prog, map->r_vers, | |
320 | map->r_addr, map->r_netid); | |
321 | ||
322 | msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET]; | |
323 | if (port) | |
324 | msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET]; | |
325 | ||
326 | return rpcb_register_call((struct sockaddr *)&rpcb_in6addr_loopback, | |
327 | sizeof(rpcb_in6addr_loopback), | |
14aeb211 | 328 | RPCBVERS_4, msg); |
c2e1b09f CL |
329 | } |
330 | ||
331 | /** | |
332 | * rpcb_v4_register - set or unset a port registration with the local rpcbind | |
333 | * @program: RPC program number of service to (un)register | |
334 | * @version: RPC version number of service to (un)register | |
335 | * @address: address family, IP address, and port to (un)register | |
336 | * @netid: netid of transport protocol to (un)register | |
14aeb211 CL |
337 | * |
338 | * Returns zero if the registration request was dispatched successfully | |
339 | * and the rpcbind daemon returned success. Otherwise, returns an errno | |
340 | * value that reflects the nature of the error (request could not be | |
341 | * dispatched, timed out, or rpcbind returned an error). | |
c2e1b09f CL |
342 | * |
343 | * RPC services invoke this function to advertise their contact | |
344 | * information via the system's rpcbind daemon. RPC services | |
345 | * invoke this function once for each [program, version, address, | |
346 | * netid] tuple they wish to advertise. | |
347 | * | |
348 | * Callers may also unregister RPC services that are no longer | |
349 | * available by setting the port number in the passed-in address | |
350 | * to zero. Callers pass a netid of "" to unregister all | |
351 | * transport netids associated with [program, version, address]. | |
352 | * | |
c2e1b09f CL |
353 | * This function uses rpcbind protocol version 4 to contact the |
354 | * local rpcbind daemon. The local rpcbind daemon must support | |
355 | * version 4 of the rpcbind protocol in order for these functions | |
356 | * to register a service successfully. | |
357 | * | |
358 | * Supported netids include "udp" and "tcp" for UDP and TCP over | |
359 | * IPv4, and "udp6" and "tcp6" for UDP and TCP over IPv6, | |
360 | * respectively. | |
361 | * | |
362 | * The contents of @address determine the address family and the | |
363 | * port to be registered. The usual practice is to pass INADDR_ANY | |
364 | * as the raw address, but specifying a non-zero address is also | |
365 | * supported by this API if the caller wishes to advertise an RPC | |
366 | * service on a specific network interface. | |
367 | * | |
368 | * Note that passing in INADDR_ANY does not create the same service | |
369 | * registration as IN6ADDR_ANY. The former advertises an RPC | |
370 | * service on any IPv4 address, but not on IPv6. The latter | |
371 | * advertises the service on all IPv4 and IPv6 addresses. | |
372 | */ | |
373 | int rpcb_v4_register(const u32 program, const u32 version, | |
14aeb211 | 374 | const struct sockaddr *address, const char *netid) |
c2e1b09f CL |
375 | { |
376 | struct rpcbind_args map = { | |
377 | .r_prog = program, | |
378 | .r_vers = version, | |
379 | .r_netid = netid, | |
380 | .r_owner = RPCB_OWNER_STRING, | |
381 | }; | |
382 | struct rpc_message msg = { | |
383 | .rpc_argp = &map, | |
c2e1b09f CL |
384 | }; |
385 | ||
c2e1b09f CL |
386 | switch (address->sa_family) { |
387 | case AF_INET: | |
388 | return rpcb_register_netid4((struct sockaddr_in *)address, | |
389 | &msg); | |
390 | case AF_INET6: | |
391 | return rpcb_register_netid6((struct sockaddr_in6 *)address, | |
392 | &msg); | |
393 | } | |
394 | ||
395 | return -EAFNOSUPPORT; | |
396 | } | |
397 | ||
a509050b | 398 | /** |
cce63cd6 | 399 | * rpcb_getport_sync - obtain the port for an RPC service on a given host |
a509050b CL |
400 | * @sin: address of remote peer |
401 | * @prog: RPC program number to bind | |
402 | * @vers: RPC version number to bind | |
403 | * @prot: transport protocol to use to make this request | |
404 | * | |
67d60213 CL |
405 | * Return value is the requested advertised port number, |
406 | * or a negative errno value. | |
407 | * | |
a509050b | 408 | * Called from outside the RPC client in a synchronous task context. |
cce63cd6 | 409 | * Uses default timeout parameters specified by underlying transport. |
a509050b | 410 | * |
67d60213 | 411 | * XXX: Needs to support IPv6 |
a509050b | 412 | */ |
f1ec08cb | 413 | int rpcb_getport_sync(struct sockaddr_in *sin, u32 prog, u32 vers, int prot) |
a509050b CL |
414 | { |
415 | struct rpcbind_args map = { | |
416 | .r_prog = prog, | |
417 | .r_vers = vers, | |
418 | .r_prot = prot, | |
419 | .r_port = 0, | |
420 | }; | |
421 | struct rpc_message msg = { | |
422 | .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT], | |
423 | .rpc_argp = &map, | |
424 | .rpc_resp = &map.r_port, | |
425 | }; | |
426 | struct rpc_clnt *rpcb_clnt; | |
a509050b CL |
427 | int status; |
428 | ||
cce63cd6 | 429 | dprintk("RPC: %s(" NIPQUAD_FMT ", %u, %u, %d)\n", |
0dc47877 | 430 | __func__, NIPQUAD(sin->sin_addr.s_addr), prog, vers, prot); |
a509050b | 431 | |
b91e101f | 432 | rpcb_clnt = rpcb_create(NULL, (struct sockaddr *)sin, |
423d8b06 | 433 | sizeof(*sin), prot, RPCBVERS_2); |
a509050b CL |
434 | if (IS_ERR(rpcb_clnt)) |
435 | return PTR_ERR(rpcb_clnt); | |
436 | ||
437 | status = rpc_call_sync(rpcb_clnt, &msg, 0); | |
90c5755f | 438 | rpc_shutdown_client(rpcb_clnt); |
a509050b CL |
439 | |
440 | if (status >= 0) { | |
441 | if (map.r_port != 0) | |
442 | return map.r_port; | |
443 | status = -EACCES; | |
444 | } | |
445 | return status; | |
446 | } | |
cce63cd6 | 447 | EXPORT_SYMBOL_GPL(rpcb_getport_sync); |
a509050b | 448 | |
803a9067 | 449 | static struct rpc_task *rpcb_call_async(struct rpc_clnt *rpcb_clnt, struct rpcbind_args *map, struct rpc_procinfo *proc) |
5138fde0 TM |
450 | { |
451 | struct rpc_message msg = { | |
803a9067 | 452 | .rpc_proc = proc, |
5138fde0 TM |
453 | .rpc_argp = map, |
454 | .rpc_resp = &map->r_port, | |
455 | }; | |
456 | struct rpc_task_setup task_setup_data = { | |
457 | .rpc_client = rpcb_clnt, | |
458 | .rpc_message = &msg, | |
459 | .callback_ops = &rpcb_getport_ops, | |
460 | .callback_data = map, | |
461 | .flags = RPC_TASK_ASYNC, | |
462 | }; | |
463 | ||
464 | return rpc_run_task(&task_setup_data); | |
465 | } | |
466 | ||
a509050b | 467 | /** |
45160d62 | 468 | * rpcb_getport_async - obtain the port for a given RPC service on a given host |
a509050b CL |
469 | * @task: task that is waiting for portmapper request |
470 | * | |
471 | * This one can be called for an ongoing RPC request, and can be used in | |
472 | * an async (rpciod) context. | |
473 | */ | |
45160d62 | 474 | void rpcb_getport_async(struct rpc_task *task) |
a509050b CL |
475 | { |
476 | struct rpc_clnt *clnt = task->tk_client; | |
803a9067 | 477 | struct rpc_procinfo *proc; |
0a48f5d7 | 478 | u32 bind_version; |
a509050b CL |
479 | struct rpc_xprt *xprt = task->tk_xprt; |
480 | struct rpc_clnt *rpcb_clnt; | |
481 | static struct rpcbind_args *map; | |
482 | struct rpc_task *child; | |
9f6ad26d CL |
483 | struct sockaddr_storage addr; |
484 | struct sockaddr *sap = (struct sockaddr *)&addr; | |
485 | size_t salen; | |
a509050b CL |
486 | int status; |
487 | ||
45160d62 | 488 | dprintk("RPC: %5u %s(%s, %u, %u, %d)\n", |
0dc47877 | 489 | task->tk_pid, __func__, |
45160d62 | 490 | clnt->cl_server, clnt->cl_prog, clnt->cl_vers, xprt->prot); |
a509050b CL |
491 | |
492 | /* Autobind on cloned rpc clients is discouraged */ | |
493 | BUG_ON(clnt->cl_parent != clnt); | |
494 | ||
381ba74a TM |
495 | /* Put self on the wait queue to ensure we get notified if |
496 | * some other task is already attempting to bind the port */ | |
497 | rpc_sleep_on(&xprt->binding, task, NULL); | |
498 | ||
a509050b | 499 | if (xprt_test_and_set_binding(xprt)) { |
45160d62 | 500 | dprintk("RPC: %5u %s: waiting for another binder\n", |
0dc47877 | 501 | task->tk_pid, __func__); |
381ba74a | 502 | return; |
a509050b CL |
503 | } |
504 | ||
a509050b CL |
505 | /* Someone else may have bound if we slept */ |
506 | if (xprt_bound(xprt)) { | |
507 | status = 0; | |
45160d62 | 508 | dprintk("RPC: %5u %s: already bound\n", |
0dc47877 | 509 | task->tk_pid, __func__); |
a509050b CL |
510 | goto bailout_nofree; |
511 | } | |
512 | ||
9f6ad26d | 513 | salen = rpc_peeraddr(clnt, sap, sizeof(addr)); |
d5b64430 CL |
514 | |
515 | /* Don't ever use rpcbind v2 for AF_INET6 requests */ | |
9f6ad26d | 516 | switch (sap->sa_family) { |
d5b64430 | 517 | case AF_INET: |
803a9067 TM |
518 | proc = rpcb_next_version[xprt->bind_index].rpc_proc; |
519 | bind_version = rpcb_next_version[xprt->bind_index].rpc_vers; | |
d5b64430 CL |
520 | break; |
521 | case AF_INET6: | |
803a9067 TM |
522 | proc = rpcb_next_version6[xprt->bind_index].rpc_proc; |
523 | bind_version = rpcb_next_version6[xprt->bind_index].rpc_vers; | |
d5b64430 CL |
524 | break; |
525 | default: | |
526 | status = -EAFNOSUPPORT; | |
527 | dprintk("RPC: %5u %s: bad address family\n", | |
0dc47877 | 528 | task->tk_pid, __func__); |
d5b64430 CL |
529 | goto bailout_nofree; |
530 | } | |
803a9067 | 531 | if (proc == NULL) { |
a509050b | 532 | xprt->bind_index = 0; |
906462af | 533 | status = -EPFNOSUPPORT; |
45160d62 | 534 | dprintk("RPC: %5u %s: no more getport versions available\n", |
0dc47877 | 535 | task->tk_pid, __func__); |
a509050b CL |
536 | goto bailout_nofree; |
537 | } | |
a509050b | 538 | |
45160d62 | 539 | dprintk("RPC: %5u %s: trying rpcbind version %u\n", |
0dc47877 | 540 | task->tk_pid, __func__, bind_version); |
a509050b | 541 | |
9f6ad26d | 542 | rpcb_clnt = rpcb_create(clnt->cl_server, sap, salen, xprt->prot, |
423d8b06 | 543 | bind_version); |
143b6c40 CL |
544 | if (IS_ERR(rpcb_clnt)) { |
545 | status = PTR_ERR(rpcb_clnt); | |
546 | dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n", | |
0dc47877 | 547 | task->tk_pid, __func__, PTR_ERR(rpcb_clnt)); |
143b6c40 CL |
548 | goto bailout_nofree; |
549 | } | |
550 | ||
a509050b CL |
551 | map = kzalloc(sizeof(struct rpcbind_args), GFP_ATOMIC); |
552 | if (!map) { | |
553 | status = -ENOMEM; | |
45160d62 | 554 | dprintk("RPC: %5u %s: no memory available\n", |
0dc47877 | 555 | task->tk_pid, __func__); |
a509050b CL |
556 | goto bailout_nofree; |
557 | } | |
558 | map->r_prog = clnt->cl_prog; | |
559 | map->r_vers = clnt->cl_vers; | |
560 | map->r_prot = xprt->prot; | |
561 | map->r_port = 0; | |
562 | map->r_xprt = xprt_get(xprt); | |
86d61d86 TM |
563 | map->r_netid = rpc_peeraddr2str(clnt, RPC_DISPLAY_NETID); |
564 | map->r_addr = rpc_peeraddr2str(rpcb_clnt, RPC_DISPLAY_UNIVERSAL_ADDR); | |
a509050b | 565 | map->r_owner = RPCB_OWNER_STRING; /* ignored for GETADDR */ |
381ba74a | 566 | map->r_status = -EIO; |
a509050b | 567 | |
803a9067 | 568 | child = rpcb_call_async(rpcb_clnt, map, proc); |
4c402b40 | 569 | rpc_release_client(rpcb_clnt); |
a509050b | 570 | if (IS_ERR(child)) { |
0d3a34b4 | 571 | /* rpcb_map_release() has freed the arguments */ |
45160d62 | 572 | dprintk("RPC: %5u %s: rpc_run_task failed\n", |
0dc47877 | 573 | task->tk_pid, __func__); |
381ba74a | 574 | return; |
a509050b CL |
575 | } |
576 | rpc_put_task(child); | |
577 | ||
578 | task->tk_xprt->stat.bind_count++; | |
579 | return; | |
580 | ||
a509050b CL |
581 | bailout_nofree: |
582 | rpcb_wake_rpcbind_waiters(xprt, status); | |
a509050b CL |
583 | task->tk_status = status; |
584 | } | |
12444809 | 585 | EXPORT_SYMBOL_GPL(rpcb_getport_async); |
a509050b CL |
586 | |
587 | /* | |
588 | * Rpcbind child task calls this callback via tk_exit. | |
589 | */ | |
590 | static void rpcb_getport_done(struct rpc_task *child, void *data) | |
591 | { | |
592 | struct rpcbind_args *map = data; | |
593 | struct rpc_xprt *xprt = map->r_xprt; | |
594 | int status = child->tk_status; | |
595 | ||
4784cb51 CL |
596 | /* Garbage reply: retry with a lesser rpcbind version */ |
597 | if (status == -EIO) | |
598 | status = -EPROTONOSUPPORT; | |
599 | ||
a509050b CL |
600 | /* rpcbind server doesn't support this rpcbind protocol version */ |
601 | if (status == -EPROTONOSUPPORT) | |
602 | xprt->bind_index++; | |
603 | ||
604 | if (status < 0) { | |
605 | /* rpcbind server not available on remote host? */ | |
606 | xprt->ops->set_port(xprt, 0); | |
607 | } else if (map->r_port == 0) { | |
608 | /* Requested RPC service wasn't registered on remote host */ | |
609 | xprt->ops->set_port(xprt, 0); | |
610 | status = -EACCES; | |
611 | } else { | |
612 | /* Succeeded */ | |
613 | xprt->ops->set_port(xprt, map->r_port); | |
614 | xprt_set_bound(xprt); | |
615 | status = 0; | |
616 | } | |
617 | ||
618 | dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n", | |
619 | child->tk_pid, status, map->r_port); | |
620 | ||
381ba74a | 621 | map->r_status = status; |
a509050b CL |
622 | } |
623 | ||
166b88d7 CL |
624 | /* |
625 | * XDR functions for rpcbind | |
626 | */ | |
627 | ||
a509050b CL |
628 | static int rpcb_encode_mapping(struct rpc_rqst *req, __be32 *p, |
629 | struct rpcbind_args *rpcb) | |
630 | { | |
631 | dprintk("RPC: rpcb_encode_mapping(%u, %u, %d, %u)\n", | |
632 | rpcb->r_prog, rpcb->r_vers, rpcb->r_prot, rpcb->r_port); | |
633 | *p++ = htonl(rpcb->r_prog); | |
634 | *p++ = htonl(rpcb->r_vers); | |
635 | *p++ = htonl(rpcb->r_prot); | |
636 | *p++ = htonl(rpcb->r_port); | |
637 | ||
638 | req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); | |
639 | return 0; | |
640 | } | |
641 | ||
642 | static int rpcb_decode_getport(struct rpc_rqst *req, __be32 *p, | |
643 | unsigned short *portp) | |
644 | { | |
645 | *portp = (unsigned short) ntohl(*p++); | |
877fcf10 | 646 | dprintk("RPC: rpcb_decode_getport result %u\n", |
a509050b CL |
647 | *portp); |
648 | return 0; | |
649 | } | |
650 | ||
651 | static int rpcb_decode_set(struct rpc_rqst *req, __be32 *p, | |
652 | unsigned int *boolp) | |
653 | { | |
654 | *boolp = (unsigned int) ntohl(*p++); | |
877fcf10 CL |
655 | dprintk("RPC: rpcb_decode_set: call %s\n", |
656 | (*boolp ? "succeeded" : "failed")); | |
a509050b CL |
657 | return 0; |
658 | } | |
659 | ||
660 | static int rpcb_encode_getaddr(struct rpc_rqst *req, __be32 *p, | |
661 | struct rpcbind_args *rpcb) | |
662 | { | |
663 | dprintk("RPC: rpcb_encode_getaddr(%u, %u, %s)\n", | |
664 | rpcb->r_prog, rpcb->r_vers, rpcb->r_addr); | |
665 | *p++ = htonl(rpcb->r_prog); | |
666 | *p++ = htonl(rpcb->r_vers); | |
667 | ||
668 | p = xdr_encode_string(p, rpcb->r_netid); | |
669 | p = xdr_encode_string(p, rpcb->r_addr); | |
670 | p = xdr_encode_string(p, rpcb->r_owner); | |
671 | ||
672 | req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); | |
673 | ||
674 | return 0; | |
675 | } | |
676 | ||
677 | static int rpcb_decode_getaddr(struct rpc_rqst *req, __be32 *p, | |
678 | unsigned short *portp) | |
679 | { | |
680 | char *addr; | |
adc24df8 CL |
681 | u32 addr_len; |
682 | int c, i, f, first, val; | |
a509050b CL |
683 | |
684 | *portp = 0; | |
adc24df8 | 685 | addr_len = ntohl(*p++); |
a509050b | 686 | |
e65fe397 CL |
687 | /* |
688 | * Simple sanity check. The smallest possible universal | |
689 | * address is an IPv4 address string containing 11 bytes. | |
690 | */ | |
0fb2b7e9 | 691 | if (addr_len < 11 || addr_len > RPCBIND_MAXUADDRLEN) |
e65fe397 CL |
692 | goto out_err; |
693 | ||
694 | /* | |
695 | * Start at the end and walk backwards until the first dot | |
696 | * is encountered. When the second dot is found, we have | |
697 | * both parts of the port number. | |
698 | */ | |
a509050b CL |
699 | addr = (char *)p; |
700 | val = 0; | |
701 | first = 1; | |
702 | f = 1; | |
703 | for (i = addr_len - 1; i > 0; i--) { | |
704 | c = addr[i]; | |
705 | if (c >= '0' && c <= '9') { | |
706 | val += (c - '0') * f; | |
707 | f *= 10; | |
708 | } else if (c == '.') { | |
709 | if (first) { | |
710 | *portp = val; | |
711 | val = first = 0; | |
712 | f = 1; | |
713 | } else { | |
714 | *portp |= (val << 8); | |
715 | break; | |
716 | } | |
717 | } | |
718 | } | |
719 | ||
e65fe397 CL |
720 | /* |
721 | * Simple sanity check. If we never saw a dot in the reply, | |
722 | * then this was probably just garbage. | |
723 | */ | |
724 | if (first) | |
725 | goto out_err; | |
726 | ||
a509050b CL |
727 | dprintk("RPC: rpcb_decode_getaddr port=%u\n", *portp); |
728 | return 0; | |
e65fe397 CL |
729 | |
730 | out_err: | |
731 | dprintk("RPC: rpcbind server returned malformed reply\n"); | |
732 | return -EIO; | |
a509050b CL |
733 | } |
734 | ||
735 | #define RPCB_program_sz (1u) | |
736 | #define RPCB_version_sz (1u) | |
737 | #define RPCB_protocol_sz (1u) | |
738 | #define RPCB_port_sz (1u) | |
739 | #define RPCB_boolean_sz (1u) | |
740 | ||
4f40ee4a | 741 | #define RPCB_netid_sz (1+XDR_QUADLEN(RPCBIND_MAXNETIDLEN)) |
0fb2b7e9 | 742 | #define RPCB_addr_sz (1+XDR_QUADLEN(RPCBIND_MAXUADDRLEN)) |
a509050b CL |
743 | #define RPCB_ownerstring_sz (1+XDR_QUADLEN(RPCB_MAXOWNERLEN)) |
744 | ||
745 | #define RPCB_mappingargs_sz RPCB_program_sz+RPCB_version_sz+ \ | |
746 | RPCB_protocol_sz+RPCB_port_sz | |
747 | #define RPCB_getaddrargs_sz RPCB_program_sz+RPCB_version_sz+ \ | |
748 | RPCB_netid_sz+RPCB_addr_sz+ \ | |
749 | RPCB_ownerstring_sz | |
750 | ||
751 | #define RPCB_setres_sz RPCB_boolean_sz | |
752 | #define RPCB_getportres_sz RPCB_port_sz | |
753 | ||
754 | /* | |
755 | * Note that RFC 1833 does not put any size restrictions on the | |
756 | * address string returned by the remote rpcbind database. | |
757 | */ | |
758 | #define RPCB_getaddrres_sz RPCB_addr_sz | |
759 | ||
760 | #define PROC(proc, argtype, restype) \ | |
761 | [RPCBPROC_##proc] = { \ | |
762 | .p_proc = RPCBPROC_##proc, \ | |
763 | .p_encode = (kxdrproc_t) rpcb_encode_##argtype, \ | |
764 | .p_decode = (kxdrproc_t) rpcb_decode_##restype, \ | |
765 | .p_arglen = RPCB_##argtype##args_sz, \ | |
766 | .p_replen = RPCB_##restype##res_sz, \ | |
767 | .p_statidx = RPCBPROC_##proc, \ | |
768 | .p_timer = 0, \ | |
769 | .p_name = #proc, \ | |
770 | } | |
771 | ||
772 | /* | |
773 | * Not all rpcbind procedures described in RFC 1833 are implemented | |
774 | * since the Linux kernel RPC code requires only these. | |
775 | */ | |
776 | static struct rpc_procinfo rpcb_procedures2[] = { | |
777 | PROC(SET, mapping, set), | |
778 | PROC(UNSET, mapping, set), | |
6a774051 | 779 | PROC(GETPORT, mapping, getport), |
a509050b CL |
780 | }; |
781 | ||
782 | static struct rpc_procinfo rpcb_procedures3[] = { | |
166b88d7 CL |
783 | PROC(SET, getaddr, set), |
784 | PROC(UNSET, getaddr, set), | |
a509050b CL |
785 | PROC(GETADDR, getaddr, getaddr), |
786 | }; | |
787 | ||
788 | static struct rpc_procinfo rpcb_procedures4[] = { | |
166b88d7 CL |
789 | PROC(SET, getaddr, set), |
790 | PROC(UNSET, getaddr, set), | |
8842413a | 791 | PROC(GETADDR, getaddr, getaddr), |
a509050b CL |
792 | PROC(GETVERSADDR, getaddr, getaddr), |
793 | }; | |
794 | ||
795 | static struct rpcb_info rpcb_next_version[] = { | |
fc200e79 CL |
796 | { |
797 | .rpc_vers = RPCBVERS_2, | |
798 | .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT], | |
799 | }, | |
800 | { | |
801 | .rpc_proc = NULL, | |
802 | }, | |
a509050b CL |
803 | }; |
804 | ||
d5b64430 | 805 | static struct rpcb_info rpcb_next_version6[] = { |
fc200e79 CL |
806 | { |
807 | .rpc_vers = RPCBVERS_4, | |
8842413a | 808 | .rpc_proc = &rpcb_procedures4[RPCBPROC_GETADDR], |
fc200e79 CL |
809 | }, |
810 | { | |
811 | .rpc_vers = RPCBVERS_3, | |
812 | .rpc_proc = &rpcb_procedures3[RPCBPROC_GETADDR], | |
813 | }, | |
fc200e79 CL |
814 | { |
815 | .rpc_proc = NULL, | |
816 | }, | |
d5b64430 CL |
817 | }; |
818 | ||
a509050b | 819 | static struct rpc_version rpcb_version2 = { |
fc200e79 | 820 | .number = RPCBVERS_2, |
a509050b CL |
821 | .nrprocs = RPCB_HIGHPROC_2, |
822 | .procs = rpcb_procedures2 | |
823 | }; | |
824 | ||
825 | static struct rpc_version rpcb_version3 = { | |
fc200e79 | 826 | .number = RPCBVERS_3, |
a509050b CL |
827 | .nrprocs = RPCB_HIGHPROC_3, |
828 | .procs = rpcb_procedures3 | |
829 | }; | |
830 | ||
831 | static struct rpc_version rpcb_version4 = { | |
fc200e79 | 832 | .number = RPCBVERS_4, |
a509050b CL |
833 | .nrprocs = RPCB_HIGHPROC_4, |
834 | .procs = rpcb_procedures4 | |
835 | }; | |
836 | ||
837 | static struct rpc_version *rpcb_version[] = { | |
838 | NULL, | |
839 | NULL, | |
840 | &rpcb_version2, | |
841 | &rpcb_version3, | |
842 | &rpcb_version4 | |
843 | }; | |
844 | ||
845 | static struct rpc_stat rpcb_stats; | |
846 | ||
7f4adeff | 847 | static struct rpc_program rpcb_program = { |
a509050b CL |
848 | .name = "rpcbind", |
849 | .number = RPCBIND_PROGRAM, | |
850 | .nrvers = ARRAY_SIZE(rpcb_version), | |
851 | .version = rpcb_version, | |
852 | .stats = &rpcb_stats, | |
853 | }; |