Commit | Line | Data |
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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> | |
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. | |
126e4bc3 CL |
66 | * |
67 | * For AF_LOCAL SET/UNSET requests, rpcbind treats this string as a | |
68 | * UID which it maps to a local user name via a password lookup. | |
69 | * In all other cases it is ignored. | |
70 | * | |
71 | * For SET/UNSET requests, user space provides a value, even for | |
72 | * network requests, and GETADDR uses an empty string. We follow | |
73 | * those precedents here. | |
a509050b | 74 | */ |
126e4bc3 | 75 | #define RPCB_OWNER_STRING "0" |
a509050b CL |
76 | #define RPCB_MAXOWNERLEN sizeof(RPCB_OWNER_STRING) |
77 | ||
0b10bf5e CL |
78 | /* |
79 | * XDR data type sizes | |
80 | */ | |
81 | #define RPCB_program_sz (1) | |
82 | #define RPCB_version_sz (1) | |
83 | #define RPCB_protocol_sz (1) | |
84 | #define RPCB_port_sz (1) | |
85 | #define RPCB_boolean_sz (1) | |
86 | ||
87 | #define RPCB_netid_sz (1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN)) | |
88 | #define RPCB_addr_sz (1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN)) | |
89 | #define RPCB_ownerstring_sz (1 + XDR_QUADLEN(RPCB_MAXOWNERLEN)) | |
90 | ||
91 | /* | |
92 | * XDR argument and result sizes | |
93 | */ | |
94 | #define RPCB_mappingargs_sz (RPCB_program_sz + RPCB_version_sz + \ | |
95 | RPCB_protocol_sz + RPCB_port_sz) | |
96 | #define RPCB_getaddrargs_sz (RPCB_program_sz + RPCB_version_sz + \ | |
97 | RPCB_netid_sz + RPCB_addr_sz + \ | |
98 | RPCB_ownerstring_sz) | |
99 | ||
100 | #define RPCB_getportres_sz RPCB_port_sz | |
101 | #define RPCB_setres_sz RPCB_boolean_sz | |
102 | ||
103 | /* | |
104 | * Note that RFC 1833 does not put any size restrictions on the | |
105 | * address string returned by the remote rpcbind database. | |
106 | */ | |
107 | #define RPCB_getaddrres_sz RPCB_addr_sz | |
108 | ||
a509050b | 109 | static void rpcb_getport_done(struct rpc_task *, void *); |
381ba74a | 110 | static void rpcb_map_release(void *data); |
7f4adeff | 111 | static struct rpc_program rpcb_program; |
a509050b CL |
112 | |
113 | struct rpcbind_args { | |
114 | struct rpc_xprt * r_xprt; | |
115 | ||
116 | u32 r_prog; | |
117 | u32 r_vers; | |
118 | u32 r_prot; | |
119 | unsigned short r_port; | |
86d61d86 TM |
120 | const char * r_netid; |
121 | const char * r_addr; | |
122 | const char * r_owner; | |
381ba74a TM |
123 | |
124 | int r_status; | |
a509050b CL |
125 | }; |
126 | ||
127 | static struct rpc_procinfo rpcb_procedures2[]; | |
128 | static struct rpc_procinfo rpcb_procedures3[]; | |
c2e1b09f | 129 | static struct rpc_procinfo rpcb_procedures4[]; |
a509050b | 130 | |
d5b64430 | 131 | struct rpcb_info { |
fc200e79 | 132 | u32 rpc_vers; |
a509050b | 133 | struct rpc_procinfo * rpc_proc; |
d5b64430 CL |
134 | }; |
135 | ||
136 | static struct rpcb_info rpcb_next_version[]; | |
137 | static struct rpcb_info rpcb_next_version6[]; | |
a509050b | 138 | |
a509050b | 139 | static const struct rpc_call_ops rpcb_getport_ops = { |
a509050b CL |
140 | .rpc_call_done = rpcb_getport_done, |
141 | .rpc_release = rpcb_map_release, | |
142 | }; | |
143 | ||
144 | static void rpcb_wake_rpcbind_waiters(struct rpc_xprt *xprt, int status) | |
145 | { | |
146 | xprt_clear_binding(xprt); | |
147 | rpc_wake_up_status(&xprt->binding, status); | |
148 | } | |
149 | ||
381ba74a TM |
150 | static void rpcb_map_release(void *data) |
151 | { | |
152 | struct rpcbind_args *map = data; | |
153 | ||
154 | rpcb_wake_rpcbind_waiters(map->r_xprt, map->r_status); | |
155 | xprt_put(map->r_xprt); | |
156 | kfree(map); | |
157 | } | |
158 | ||
cc5598b7 CL |
159 | static const struct sockaddr_in rpcb_inaddr_loopback = { |
160 | .sin_family = AF_INET, | |
161 | .sin_addr.s_addr = htonl(INADDR_LOOPBACK), | |
162 | .sin_port = htons(RPCBIND_PORT), | |
163 | }; | |
164 | ||
165 | static struct rpc_clnt *rpcb_create_local(struct sockaddr *addr, | |
166 | size_t addrlen, u32 version) | |
167 | { | |
168 | struct rpc_create_args args = { | |
169 | .protocol = XPRT_TRANSPORT_UDP, | |
170 | .address = addr, | |
171 | .addrsize = addrlen, | |
172 | .servername = "localhost", | |
173 | .program = &rpcb_program, | |
174 | .version = version, | |
175 | .authflavor = RPC_AUTH_UNIX, | |
176 | .flags = RPC_CLNT_CREATE_NOPING, | |
177 | }; | |
178 | ||
179 | return rpc_create(&args); | |
180 | } | |
181 | ||
a509050b | 182 | static struct rpc_clnt *rpcb_create(char *hostname, struct sockaddr *srvaddr, |
423d8b06 | 183 | size_t salen, int proto, u32 version) |
a509050b CL |
184 | { |
185 | struct rpc_create_args args = { | |
186 | .protocol = proto, | |
187 | .address = srvaddr, | |
9f6ad26d | 188 | .addrsize = salen, |
a509050b CL |
189 | .servername = hostname, |
190 | .program = &rpcb_program, | |
191 | .version = version, | |
192 | .authflavor = RPC_AUTH_UNIX, | |
423d8b06 CL |
193 | .flags = (RPC_CLNT_CREATE_NOPING | |
194 | RPC_CLNT_CREATE_NONPRIVPORT), | |
a509050b CL |
195 | }; |
196 | ||
d5b64430 CL |
197 | switch (srvaddr->sa_family) { |
198 | case AF_INET: | |
199 | ((struct sockaddr_in *)srvaddr)->sin_port = htons(RPCBIND_PORT); | |
200 | break; | |
201 | case AF_INET6: | |
202 | ((struct sockaddr_in6 *)srvaddr)->sin6_port = htons(RPCBIND_PORT); | |
203 | break; | |
204 | default: | |
205 | return NULL; | |
206 | } | |
207 | ||
a509050b CL |
208 | return rpc_create(&args); |
209 | } | |
210 | ||
3aba4553 | 211 | static int rpcb_register_call(const u32 version, struct rpc_message *msg) |
babe80eb | 212 | { |
fc28decd CL |
213 | struct sockaddr *addr = (struct sockaddr *)&rpcb_inaddr_loopback; |
214 | size_t addrlen = sizeof(rpcb_inaddr_loopback); | |
babe80eb | 215 | struct rpc_clnt *rpcb_clnt; |
14aeb211 | 216 | int result, error = 0; |
babe80eb | 217 | |
14aeb211 | 218 | msg->rpc_resp = &result; |
babe80eb CL |
219 | |
220 | rpcb_clnt = rpcb_create_local(addr, addrlen, version); | |
221 | if (!IS_ERR(rpcb_clnt)) { | |
222 | error = rpc_call_sync(rpcb_clnt, msg, 0); | |
223 | rpc_shutdown_client(rpcb_clnt); | |
224 | } else | |
225 | error = PTR_ERR(rpcb_clnt); | |
226 | ||
14aeb211 | 227 | if (error < 0) { |
363f724c | 228 | dprintk("RPC: failed to contact local rpcbind " |
babe80eb | 229 | "server (errno %d).\n", -error); |
14aeb211 CL |
230 | return error; |
231 | } | |
232 | ||
db820d63 | 233 | if (!result) |
14aeb211 | 234 | return -EACCES; |
14aeb211 | 235 | return 0; |
babe80eb CL |
236 | } |
237 | ||
a509050b CL |
238 | /** |
239 | * rpcb_register - set or unset a port registration with the local rpcbind svc | |
240 | * @prog: RPC program number to bind | |
241 | * @vers: RPC version number to bind | |
c2e1b09f | 242 | * @prot: transport protocol to register |
a509050b | 243 | * @port: port value to register |
14aeb211 CL |
244 | * |
245 | * Returns zero if the registration request was dispatched successfully | |
246 | * and the rpcbind daemon returned success. Otherwise, returns an errno | |
247 | * value that reflects the nature of the error (request could not be | |
248 | * dispatched, timed out, or rpcbind returned an error). | |
c2e1b09f CL |
249 | * |
250 | * RPC services invoke this function to advertise their contact | |
251 | * information via the system's rpcbind daemon. RPC services | |
252 | * invoke this function once for each [program, version, transport] | |
253 | * tuple they wish to advertise. | |
254 | * | |
255 | * Callers may also unregister RPC services that are no longer | |
256 | * available by setting the passed-in port to zero. This removes | |
257 | * all registered transports for [program, version] from the local | |
258 | * rpcbind database. | |
259 | * | |
c2e1b09f CL |
260 | * This function uses rpcbind protocol version 2 to contact the |
261 | * local rpcbind daemon. | |
262 | * | |
263 | * Registration works over both AF_INET and AF_INET6, and services | |
264 | * registered via this function are advertised as available for any | |
265 | * address. If the local rpcbind daemon is listening on AF_INET6, | |
266 | * services registered via this function will be advertised on | |
267 | * IN6ADDR_ANY (ie available for all AF_INET and AF_INET6 | |
268 | * addresses). | |
a509050b | 269 | */ |
14aeb211 | 270 | int rpcb_register(u32 prog, u32 vers, int prot, unsigned short port) |
a509050b | 271 | { |
a509050b CL |
272 | struct rpcbind_args map = { |
273 | .r_prog = prog, | |
274 | .r_vers = vers, | |
275 | .r_prot = prot, | |
276 | .r_port = port, | |
277 | }; | |
278 | struct rpc_message msg = { | |
a509050b | 279 | .rpc_argp = &map, |
a509050b | 280 | }; |
a509050b CL |
281 | |
282 | dprintk("RPC: %sregistering (%u, %u, %d, %u) with local " | |
283 | "rpcbind\n", (port ? "" : "un"), | |
284 | prog, vers, prot, port); | |
285 | ||
babe80eb CL |
286 | msg.rpc_proc = &rpcb_procedures2[RPCBPROC_UNSET]; |
287 | if (port) | |
288 | msg.rpc_proc = &rpcb_procedures2[RPCBPROC_SET]; | |
a509050b | 289 | |
fc28decd | 290 | return rpcb_register_call(RPCBVERS_2, &msg); |
a509050b CL |
291 | } |
292 | ||
c2e1b09f CL |
293 | /* |
294 | * Fill in AF_INET family-specific arguments to register | |
295 | */ | |
1673d0de CL |
296 | static int rpcb_register_inet4(const struct sockaddr *sap, |
297 | struct rpc_message *msg) | |
c2e1b09f | 298 | { |
3aba4553 | 299 | const struct sockaddr_in *sin = (const struct sockaddr_in *)sap; |
c2e1b09f | 300 | struct rpcbind_args *map = msg->rpc_argp; |
3aba4553 | 301 | unsigned short port = ntohs(sin->sin_port); |
c2e1b09f CL |
302 | char buf[32]; |
303 | ||
304 | /* Construct AF_INET universal address */ | |
21454aaa | 305 | snprintf(buf, sizeof(buf), "%pI4.%u.%u", |
3aba4553 | 306 | &sin->sin_addr.s_addr, port >> 8, port & 0xff); |
c2e1b09f CL |
307 | map->r_addr = buf; |
308 | ||
309 | dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with " | |
310 | "local rpcbind\n", (port ? "" : "un"), | |
311 | map->r_prog, map->r_vers, | |
312 | map->r_addr, map->r_netid); | |
313 | ||
314 | msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET]; | |
315 | if (port) | |
316 | msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET]; | |
317 | ||
fc28decd | 318 | return rpcb_register_call(RPCBVERS_4, msg); |
c2e1b09f CL |
319 | } |
320 | ||
321 | /* | |
322 | * Fill in AF_INET6 family-specific arguments to register | |
323 | */ | |
1673d0de CL |
324 | static int rpcb_register_inet6(const struct sockaddr *sap, |
325 | struct rpc_message *msg) | |
c2e1b09f | 326 | { |
3aba4553 | 327 | const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sap; |
c2e1b09f | 328 | struct rpcbind_args *map = msg->rpc_argp; |
3aba4553 | 329 | unsigned short port = ntohs(sin6->sin6_port); |
c2e1b09f CL |
330 | char buf[64]; |
331 | ||
332 | /* Construct AF_INET6 universal address */ | |
3aba4553 | 333 | if (ipv6_addr_any(&sin6->sin6_addr)) |
9d548b9c CL |
334 | snprintf(buf, sizeof(buf), "::.%u.%u", |
335 | port >> 8, port & 0xff); | |
336 | else | |
5b095d98 | 337 | snprintf(buf, sizeof(buf), "%pI6.%u.%u", |
3aba4553 | 338 | &sin6->sin6_addr, port >> 8, port & 0xff); |
c2e1b09f CL |
339 | map->r_addr = buf; |
340 | ||
341 | dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with " | |
342 | "local rpcbind\n", (port ? "" : "un"), | |
343 | map->r_prog, map->r_vers, | |
344 | map->r_addr, map->r_netid); | |
345 | ||
346 | msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET]; | |
347 | if (port) | |
348 | msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET]; | |
349 | ||
fc28decd | 350 | return rpcb_register_call(RPCBVERS_4, msg); |
c2e1b09f CL |
351 | } |
352 | ||
1673d0de CL |
353 | static int rpcb_unregister_all_protofamilies(struct rpc_message *msg) |
354 | { | |
355 | struct rpcbind_args *map = msg->rpc_argp; | |
356 | ||
357 | dprintk("RPC: unregistering [%u, %u, '%s'] with " | |
358 | "local rpcbind\n", | |
359 | map->r_prog, map->r_vers, map->r_netid); | |
360 | ||
361 | map->r_addr = ""; | |
362 | msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET]; | |
363 | ||
364 | return rpcb_register_call(RPCBVERS_4, msg); | |
365 | } | |
366 | ||
c2e1b09f CL |
367 | /** |
368 | * rpcb_v4_register - set or unset a port registration with the local rpcbind | |
369 | * @program: RPC program number of service to (un)register | |
370 | * @version: RPC version number of service to (un)register | |
371 | * @address: address family, IP address, and port to (un)register | |
372 | * @netid: netid of transport protocol to (un)register | |
14aeb211 CL |
373 | * |
374 | * Returns zero if the registration request was dispatched successfully | |
375 | * and the rpcbind daemon returned success. Otherwise, returns an errno | |
376 | * value that reflects the nature of the error (request could not be | |
377 | * dispatched, timed out, or rpcbind returned an error). | |
c2e1b09f CL |
378 | * |
379 | * RPC services invoke this function to advertise their contact | |
380 | * information via the system's rpcbind daemon. RPC services | |
381 | * invoke this function once for each [program, version, address, | |
382 | * netid] tuple they wish to advertise. | |
383 | * | |
1673d0de CL |
384 | * Callers may also unregister RPC services that are registered at a |
385 | * specific address by setting the port number in @address to zero. | |
386 | * They may unregister all registered protocol families at once for | |
387 | * a service by passing a NULL @address argument. If @netid is "" | |
388 | * then all netids for [program, version, address] are unregistered. | |
c2e1b09f | 389 | * |
c2e1b09f CL |
390 | * This function uses rpcbind protocol version 4 to contact the |
391 | * local rpcbind daemon. The local rpcbind daemon must support | |
392 | * version 4 of the rpcbind protocol in order for these functions | |
393 | * to register a service successfully. | |
394 | * | |
395 | * Supported netids include "udp" and "tcp" for UDP and TCP over | |
396 | * IPv4, and "udp6" and "tcp6" for UDP and TCP over IPv6, | |
397 | * respectively. | |
398 | * | |
399 | * The contents of @address determine the address family and the | |
400 | * port to be registered. The usual practice is to pass INADDR_ANY | |
401 | * as the raw address, but specifying a non-zero address is also | |
402 | * supported by this API if the caller wishes to advertise an RPC | |
403 | * service on a specific network interface. | |
404 | * | |
405 | * Note that passing in INADDR_ANY does not create the same service | |
406 | * registration as IN6ADDR_ANY. The former advertises an RPC | |
407 | * service on any IPv4 address, but not on IPv6. The latter | |
408 | * advertises the service on all IPv4 and IPv6 addresses. | |
409 | */ | |
410 | int rpcb_v4_register(const u32 program, const u32 version, | |
14aeb211 | 411 | const struct sockaddr *address, const char *netid) |
c2e1b09f CL |
412 | { |
413 | struct rpcbind_args map = { | |
414 | .r_prog = program, | |
415 | .r_vers = version, | |
416 | .r_netid = netid, | |
417 | .r_owner = RPCB_OWNER_STRING, | |
418 | }; | |
419 | struct rpc_message msg = { | |
420 | .rpc_argp = &map, | |
c2e1b09f CL |
421 | }; |
422 | ||
1673d0de CL |
423 | if (address == NULL) |
424 | return rpcb_unregister_all_protofamilies(&msg); | |
425 | ||
c2e1b09f CL |
426 | switch (address->sa_family) { |
427 | case AF_INET: | |
1673d0de | 428 | return rpcb_register_inet4(address, &msg); |
c2e1b09f | 429 | case AF_INET6: |
1673d0de | 430 | return rpcb_register_inet6(address, &msg); |
c2e1b09f CL |
431 | } |
432 | ||
433 | return -EAFNOSUPPORT; | |
434 | } | |
435 | ||
a509050b | 436 | /** |
cce63cd6 | 437 | * rpcb_getport_sync - obtain the port for an RPC service on a given host |
a509050b CL |
438 | * @sin: address of remote peer |
439 | * @prog: RPC program number to bind | |
440 | * @vers: RPC version number to bind | |
441 | * @prot: transport protocol to use to make this request | |
442 | * | |
67d60213 CL |
443 | * Return value is the requested advertised port number, |
444 | * or a negative errno value. | |
445 | * | |
a509050b | 446 | * Called from outside the RPC client in a synchronous task context. |
cce63cd6 | 447 | * Uses default timeout parameters specified by underlying transport. |
a509050b | 448 | * |
67d60213 | 449 | * XXX: Needs to support IPv6 |
a509050b | 450 | */ |
f1ec08cb | 451 | int rpcb_getport_sync(struct sockaddr_in *sin, u32 prog, u32 vers, int prot) |
a509050b CL |
452 | { |
453 | struct rpcbind_args map = { | |
454 | .r_prog = prog, | |
455 | .r_vers = vers, | |
456 | .r_prot = prot, | |
457 | .r_port = 0, | |
458 | }; | |
459 | struct rpc_message msg = { | |
460 | .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT], | |
461 | .rpc_argp = &map, | |
462 | .rpc_resp = &map.r_port, | |
463 | }; | |
464 | struct rpc_clnt *rpcb_clnt; | |
a509050b CL |
465 | int status; |
466 | ||
21454aaa HH |
467 | dprintk("RPC: %s(%pI4, %u, %u, %d)\n", |
468 | __func__, &sin->sin_addr.s_addr, prog, vers, prot); | |
a509050b | 469 | |
b91e101f | 470 | rpcb_clnt = rpcb_create(NULL, (struct sockaddr *)sin, |
423d8b06 | 471 | sizeof(*sin), prot, RPCBVERS_2); |
a509050b CL |
472 | if (IS_ERR(rpcb_clnt)) |
473 | return PTR_ERR(rpcb_clnt); | |
474 | ||
475 | status = rpc_call_sync(rpcb_clnt, &msg, 0); | |
90c5755f | 476 | rpc_shutdown_client(rpcb_clnt); |
a509050b CL |
477 | |
478 | if (status >= 0) { | |
479 | if (map.r_port != 0) | |
480 | return map.r_port; | |
481 | status = -EACCES; | |
482 | } | |
483 | return status; | |
484 | } | |
cce63cd6 | 485 | EXPORT_SYMBOL_GPL(rpcb_getport_sync); |
a509050b | 486 | |
803a9067 | 487 | static struct rpc_task *rpcb_call_async(struct rpc_clnt *rpcb_clnt, struct rpcbind_args *map, struct rpc_procinfo *proc) |
5138fde0 TM |
488 | { |
489 | struct rpc_message msg = { | |
803a9067 | 490 | .rpc_proc = proc, |
5138fde0 TM |
491 | .rpc_argp = map, |
492 | .rpc_resp = &map->r_port, | |
493 | }; | |
494 | struct rpc_task_setup task_setup_data = { | |
495 | .rpc_client = rpcb_clnt, | |
496 | .rpc_message = &msg, | |
497 | .callback_ops = &rpcb_getport_ops, | |
498 | .callback_data = map, | |
499 | .flags = RPC_TASK_ASYNC, | |
500 | }; | |
501 | ||
502 | return rpc_run_task(&task_setup_data); | |
503 | } | |
504 | ||
9a4bd29f TM |
505 | /* |
506 | * In the case where rpc clients have been cloned, we want to make | |
507 | * sure that we use the program number/version etc of the actual | |
508 | * owner of the xprt. To do so, we walk back up the tree of parents | |
509 | * to find whoever created the transport and/or whoever has the | |
510 | * autobind flag set. | |
511 | */ | |
512 | static struct rpc_clnt *rpcb_find_transport_owner(struct rpc_clnt *clnt) | |
513 | { | |
514 | struct rpc_clnt *parent = clnt->cl_parent; | |
515 | ||
516 | while (parent != clnt) { | |
517 | if (parent->cl_xprt != clnt->cl_xprt) | |
518 | break; | |
519 | if (clnt->cl_autobind) | |
520 | break; | |
521 | clnt = parent; | |
522 | parent = parent->cl_parent; | |
523 | } | |
524 | return clnt; | |
525 | } | |
526 | ||
a509050b | 527 | /** |
45160d62 | 528 | * rpcb_getport_async - obtain the port for a given RPC service on a given host |
a509050b CL |
529 | * @task: task that is waiting for portmapper request |
530 | * | |
531 | * This one can be called for an ongoing RPC request, and can be used in | |
532 | * an async (rpciod) context. | |
533 | */ | |
45160d62 | 534 | void rpcb_getport_async(struct rpc_task *task) |
a509050b | 535 | { |
9a4bd29f | 536 | struct rpc_clnt *clnt; |
803a9067 | 537 | struct rpc_procinfo *proc; |
0a48f5d7 | 538 | u32 bind_version; |
9a4bd29f | 539 | struct rpc_xprt *xprt; |
a509050b CL |
540 | struct rpc_clnt *rpcb_clnt; |
541 | static struct rpcbind_args *map; | |
542 | struct rpc_task *child; | |
9f6ad26d CL |
543 | struct sockaddr_storage addr; |
544 | struct sockaddr *sap = (struct sockaddr *)&addr; | |
545 | size_t salen; | |
a509050b CL |
546 | int status; |
547 | ||
9a4bd29f TM |
548 | clnt = rpcb_find_transport_owner(task->tk_client); |
549 | xprt = clnt->cl_xprt; | |
550 | ||
45160d62 | 551 | dprintk("RPC: %5u %s(%s, %u, %u, %d)\n", |
0dc47877 | 552 | task->tk_pid, __func__, |
45160d62 | 553 | clnt->cl_server, clnt->cl_prog, clnt->cl_vers, xprt->prot); |
a509050b | 554 | |
381ba74a TM |
555 | /* Put self on the wait queue to ensure we get notified if |
556 | * some other task is already attempting to bind the port */ | |
557 | rpc_sleep_on(&xprt->binding, task, NULL); | |
558 | ||
a509050b | 559 | if (xprt_test_and_set_binding(xprt)) { |
45160d62 | 560 | dprintk("RPC: %5u %s: waiting for another binder\n", |
0dc47877 | 561 | task->tk_pid, __func__); |
381ba74a | 562 | return; |
a509050b CL |
563 | } |
564 | ||
a509050b CL |
565 | /* Someone else may have bound if we slept */ |
566 | if (xprt_bound(xprt)) { | |
567 | status = 0; | |
45160d62 | 568 | dprintk("RPC: %5u %s: already bound\n", |
0dc47877 | 569 | task->tk_pid, __func__); |
a509050b CL |
570 | goto bailout_nofree; |
571 | } | |
572 | ||
9f6ad26d | 573 | salen = rpc_peeraddr(clnt, sap, sizeof(addr)); |
d5b64430 CL |
574 | |
575 | /* Don't ever use rpcbind v2 for AF_INET6 requests */ | |
9f6ad26d | 576 | switch (sap->sa_family) { |
d5b64430 | 577 | case AF_INET: |
803a9067 TM |
578 | proc = rpcb_next_version[xprt->bind_index].rpc_proc; |
579 | bind_version = rpcb_next_version[xprt->bind_index].rpc_vers; | |
d5b64430 CL |
580 | break; |
581 | case AF_INET6: | |
803a9067 TM |
582 | proc = rpcb_next_version6[xprt->bind_index].rpc_proc; |
583 | bind_version = rpcb_next_version6[xprt->bind_index].rpc_vers; | |
d5b64430 CL |
584 | break; |
585 | default: | |
586 | status = -EAFNOSUPPORT; | |
587 | dprintk("RPC: %5u %s: bad address family\n", | |
0dc47877 | 588 | task->tk_pid, __func__); |
d5b64430 CL |
589 | goto bailout_nofree; |
590 | } | |
803a9067 | 591 | if (proc == NULL) { |
a509050b | 592 | xprt->bind_index = 0; |
906462af | 593 | status = -EPFNOSUPPORT; |
45160d62 | 594 | dprintk("RPC: %5u %s: no more getport versions available\n", |
0dc47877 | 595 | task->tk_pid, __func__); |
a509050b CL |
596 | goto bailout_nofree; |
597 | } | |
a509050b | 598 | |
45160d62 | 599 | dprintk("RPC: %5u %s: trying rpcbind version %u\n", |
0dc47877 | 600 | task->tk_pid, __func__, bind_version); |
a509050b | 601 | |
9f6ad26d | 602 | rpcb_clnt = rpcb_create(clnt->cl_server, sap, salen, xprt->prot, |
423d8b06 | 603 | bind_version); |
143b6c40 CL |
604 | if (IS_ERR(rpcb_clnt)) { |
605 | status = PTR_ERR(rpcb_clnt); | |
606 | dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n", | |
0dc47877 | 607 | task->tk_pid, __func__, PTR_ERR(rpcb_clnt)); |
143b6c40 CL |
608 | goto bailout_nofree; |
609 | } | |
610 | ||
a509050b CL |
611 | map = kzalloc(sizeof(struct rpcbind_args), GFP_ATOMIC); |
612 | if (!map) { | |
613 | status = -ENOMEM; | |
45160d62 | 614 | dprintk("RPC: %5u %s: no memory available\n", |
0dc47877 | 615 | task->tk_pid, __func__); |
96165e2b | 616 | goto bailout_release_client; |
a509050b CL |
617 | } |
618 | map->r_prog = clnt->cl_prog; | |
619 | map->r_vers = clnt->cl_vers; | |
620 | map->r_prot = xprt->prot; | |
621 | map->r_port = 0; | |
622 | map->r_xprt = xprt_get(xprt); | |
86d61d86 TM |
623 | map->r_netid = rpc_peeraddr2str(clnt, RPC_DISPLAY_NETID); |
624 | map->r_addr = rpc_peeraddr2str(rpcb_clnt, RPC_DISPLAY_UNIVERSAL_ADDR); | |
126e4bc3 | 625 | map->r_owner = ""; |
381ba74a | 626 | map->r_status = -EIO; |
a509050b | 627 | |
803a9067 | 628 | child = rpcb_call_async(rpcb_clnt, map, proc); |
4c402b40 | 629 | rpc_release_client(rpcb_clnt); |
a509050b | 630 | if (IS_ERR(child)) { |
0d3a34b4 | 631 | /* rpcb_map_release() has freed the arguments */ |
45160d62 | 632 | dprintk("RPC: %5u %s: rpc_run_task failed\n", |
0dc47877 | 633 | task->tk_pid, __func__); |
381ba74a | 634 | return; |
a509050b | 635 | } |
a509050b | 636 | |
9a4bd29f TM |
637 | xprt->stat.bind_count++; |
638 | rpc_put_task(child); | |
a509050b CL |
639 | return; |
640 | ||
96165e2b TM |
641 | bailout_release_client: |
642 | rpc_release_client(rpcb_clnt); | |
a509050b CL |
643 | bailout_nofree: |
644 | rpcb_wake_rpcbind_waiters(xprt, status); | |
a509050b CL |
645 | task->tk_status = status; |
646 | } | |
12444809 | 647 | EXPORT_SYMBOL_GPL(rpcb_getport_async); |
a509050b CL |
648 | |
649 | /* | |
650 | * Rpcbind child task calls this callback via tk_exit. | |
651 | */ | |
652 | static void rpcb_getport_done(struct rpc_task *child, void *data) | |
653 | { | |
654 | struct rpcbind_args *map = data; | |
655 | struct rpc_xprt *xprt = map->r_xprt; | |
656 | int status = child->tk_status; | |
657 | ||
4784cb51 CL |
658 | /* Garbage reply: retry with a lesser rpcbind version */ |
659 | if (status == -EIO) | |
660 | status = -EPROTONOSUPPORT; | |
661 | ||
a509050b CL |
662 | /* rpcbind server doesn't support this rpcbind protocol version */ |
663 | if (status == -EPROTONOSUPPORT) | |
664 | xprt->bind_index++; | |
665 | ||
666 | if (status < 0) { | |
667 | /* rpcbind server not available on remote host? */ | |
668 | xprt->ops->set_port(xprt, 0); | |
669 | } else if (map->r_port == 0) { | |
670 | /* Requested RPC service wasn't registered on remote host */ | |
671 | xprt->ops->set_port(xprt, 0); | |
672 | status = -EACCES; | |
673 | } else { | |
674 | /* Succeeded */ | |
675 | xprt->ops->set_port(xprt, map->r_port); | |
676 | xprt_set_bound(xprt); | |
677 | status = 0; | |
678 | } | |
679 | ||
680 | dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n", | |
681 | child->tk_pid, status, map->r_port); | |
682 | ||
381ba74a | 683 | map->r_status = status; |
a509050b CL |
684 | } |
685 | ||
166b88d7 CL |
686 | /* |
687 | * XDR functions for rpcbind | |
688 | */ | |
689 | ||
a509050b CL |
690 | static int rpcb_encode_mapping(struct rpc_rqst *req, __be32 *p, |
691 | struct rpcbind_args *rpcb) | |
692 | { | |
db820d63 | 693 | dprintk("RPC: encoding rpcb request (%u, %u, %d, %u)\n", |
a509050b CL |
694 | rpcb->r_prog, rpcb->r_vers, rpcb->r_prot, rpcb->r_port); |
695 | *p++ = htonl(rpcb->r_prog); | |
696 | *p++ = htonl(rpcb->r_vers); | |
697 | *p++ = htonl(rpcb->r_prot); | |
698 | *p++ = htonl(rpcb->r_port); | |
699 | ||
700 | req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); | |
701 | return 0; | |
702 | } | |
703 | ||
704 | static int rpcb_decode_getport(struct rpc_rqst *req, __be32 *p, | |
705 | unsigned short *portp) | |
706 | { | |
707 | *portp = (unsigned short) ntohl(*p++); | |
db820d63 | 708 | dprintk("RPC: rpcb getport result: %u\n", |
a509050b CL |
709 | *portp); |
710 | return 0; | |
711 | } | |
712 | ||
713 | static int rpcb_decode_set(struct rpc_rqst *req, __be32 *p, | |
714 | unsigned int *boolp) | |
715 | { | |
716 | *boolp = (unsigned int) ntohl(*p++); | |
db820d63 | 717 | dprintk("RPC: rpcb set/unset call %s\n", |
877fcf10 | 718 | (*boolp ? "succeeded" : "failed")); |
a509050b CL |
719 | return 0; |
720 | } | |
721 | ||
722 | static int rpcb_encode_getaddr(struct rpc_rqst *req, __be32 *p, | |
723 | struct rpcbind_args *rpcb) | |
724 | { | |
db820d63 | 725 | dprintk("RPC: encoding rpcb request (%u, %u, %s)\n", |
a509050b CL |
726 | rpcb->r_prog, rpcb->r_vers, rpcb->r_addr); |
727 | *p++ = htonl(rpcb->r_prog); | |
728 | *p++ = htonl(rpcb->r_vers); | |
729 | ||
730 | p = xdr_encode_string(p, rpcb->r_netid); | |
731 | p = xdr_encode_string(p, rpcb->r_addr); | |
732 | p = xdr_encode_string(p, rpcb->r_owner); | |
733 | ||
734 | req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); | |
735 | ||
736 | return 0; | |
737 | } | |
738 | ||
739 | static int rpcb_decode_getaddr(struct rpc_rqst *req, __be32 *p, | |
740 | unsigned short *portp) | |
741 | { | |
742 | char *addr; | |
adc24df8 CL |
743 | u32 addr_len; |
744 | int c, i, f, first, val; | |
a509050b CL |
745 | |
746 | *portp = 0; | |
adc24df8 | 747 | addr_len = ntohl(*p++); |
a509050b | 748 | |
776bd5c7 CL |
749 | if (addr_len == 0) { |
750 | dprintk("RPC: rpcb_decode_getaddr: " | |
751 | "service is not registered\n"); | |
752 | return 0; | |
753 | } | |
754 | ||
e65fe397 | 755 | /* |
776bd5c7 | 756 | * Simple sanity check. |
e65fe397 | 757 | */ |
776bd5c7 | 758 | if (addr_len > RPCBIND_MAXUADDRLEN) |
e65fe397 CL |
759 | goto out_err; |
760 | ||
761 | /* | |
762 | * Start at the end and walk backwards until the first dot | |
763 | * is encountered. When the second dot is found, we have | |
764 | * both parts of the port number. | |
765 | */ | |
a509050b CL |
766 | addr = (char *)p; |
767 | val = 0; | |
768 | first = 1; | |
769 | f = 1; | |
770 | for (i = addr_len - 1; i > 0; i--) { | |
771 | c = addr[i]; | |
772 | if (c >= '0' && c <= '9') { | |
773 | val += (c - '0') * f; | |
774 | f *= 10; | |
775 | } else if (c == '.') { | |
776 | if (first) { | |
777 | *portp = val; | |
778 | val = first = 0; | |
779 | f = 1; | |
780 | } else { | |
781 | *portp |= (val << 8); | |
782 | break; | |
783 | } | |
784 | } | |
785 | } | |
786 | ||
e65fe397 CL |
787 | /* |
788 | * Simple sanity check. If we never saw a dot in the reply, | |
789 | * then this was probably just garbage. | |
790 | */ | |
791 | if (first) | |
792 | goto out_err; | |
793 | ||
a509050b CL |
794 | dprintk("RPC: rpcb_decode_getaddr port=%u\n", *portp); |
795 | return 0; | |
e65fe397 CL |
796 | |
797 | out_err: | |
798 | dprintk("RPC: rpcbind server returned malformed reply\n"); | |
799 | return -EIO; | |
a509050b CL |
800 | } |
801 | ||
a509050b CL |
802 | #define PROC(proc, argtype, restype) \ |
803 | [RPCBPROC_##proc] = { \ | |
804 | .p_proc = RPCBPROC_##proc, \ | |
805 | .p_encode = (kxdrproc_t) rpcb_encode_##argtype, \ | |
806 | .p_decode = (kxdrproc_t) rpcb_decode_##restype, \ | |
807 | .p_arglen = RPCB_##argtype##args_sz, \ | |
808 | .p_replen = RPCB_##restype##res_sz, \ | |
809 | .p_statidx = RPCBPROC_##proc, \ | |
810 | .p_timer = 0, \ | |
811 | .p_name = #proc, \ | |
812 | } | |
813 | ||
814 | /* | |
815 | * Not all rpcbind procedures described in RFC 1833 are implemented | |
816 | * since the Linux kernel RPC code requires only these. | |
817 | */ | |
818 | static struct rpc_procinfo rpcb_procedures2[] = { | |
819 | PROC(SET, mapping, set), | |
820 | PROC(UNSET, mapping, set), | |
6a774051 | 821 | PROC(GETPORT, mapping, getport), |
a509050b CL |
822 | }; |
823 | ||
824 | static struct rpc_procinfo rpcb_procedures3[] = { | |
166b88d7 CL |
825 | PROC(SET, getaddr, set), |
826 | PROC(UNSET, getaddr, set), | |
a509050b CL |
827 | PROC(GETADDR, getaddr, getaddr), |
828 | }; | |
829 | ||
830 | static struct rpc_procinfo rpcb_procedures4[] = { | |
166b88d7 CL |
831 | PROC(SET, getaddr, set), |
832 | PROC(UNSET, getaddr, set), | |
8842413a | 833 | PROC(GETADDR, getaddr, getaddr), |
a509050b CL |
834 | PROC(GETVERSADDR, getaddr, getaddr), |
835 | }; | |
836 | ||
837 | static struct rpcb_info rpcb_next_version[] = { | |
fc200e79 CL |
838 | { |
839 | .rpc_vers = RPCBVERS_2, | |
840 | .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT], | |
841 | }, | |
842 | { | |
843 | .rpc_proc = NULL, | |
844 | }, | |
a509050b CL |
845 | }; |
846 | ||
d5b64430 | 847 | static struct rpcb_info rpcb_next_version6[] = { |
fc200e79 CL |
848 | { |
849 | .rpc_vers = RPCBVERS_4, | |
8842413a | 850 | .rpc_proc = &rpcb_procedures4[RPCBPROC_GETADDR], |
fc200e79 CL |
851 | }, |
852 | { | |
853 | .rpc_vers = RPCBVERS_3, | |
854 | .rpc_proc = &rpcb_procedures3[RPCBPROC_GETADDR], | |
855 | }, | |
fc200e79 CL |
856 | { |
857 | .rpc_proc = NULL, | |
858 | }, | |
d5b64430 CL |
859 | }; |
860 | ||
a509050b | 861 | static struct rpc_version rpcb_version2 = { |
fc200e79 | 862 | .number = RPCBVERS_2, |
a509050b CL |
863 | .nrprocs = RPCB_HIGHPROC_2, |
864 | .procs = rpcb_procedures2 | |
865 | }; | |
866 | ||
867 | static struct rpc_version rpcb_version3 = { | |
fc200e79 | 868 | .number = RPCBVERS_3, |
a509050b CL |
869 | .nrprocs = RPCB_HIGHPROC_3, |
870 | .procs = rpcb_procedures3 | |
871 | }; | |
872 | ||
873 | static struct rpc_version rpcb_version4 = { | |
fc200e79 | 874 | .number = RPCBVERS_4, |
a509050b CL |
875 | .nrprocs = RPCB_HIGHPROC_4, |
876 | .procs = rpcb_procedures4 | |
877 | }; | |
878 | ||
879 | static struct rpc_version *rpcb_version[] = { | |
880 | NULL, | |
881 | NULL, | |
882 | &rpcb_version2, | |
883 | &rpcb_version3, | |
884 | &rpcb_version4 | |
885 | }; | |
886 | ||
887 | static struct rpc_stat rpcb_stats; | |
888 | ||
7f4adeff | 889 | static struct rpc_program rpcb_program = { |
a509050b CL |
890 | .name = "rpcbind", |
891 | .number = RPCBIND_PROGRAM, | |
892 | .nrvers = ARRAY_SIZE(rpcb_version), | |
893 | .version = rpcb_version, | |
894 | .stats = &rpcb_stats, | |
895 | }; |