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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); | |
ba809130 | 156 | kfree(map->r_addr); |
381ba74a TM |
157 | kfree(map); |
158 | } | |
159 | ||
cc5598b7 CL |
160 | static const struct sockaddr_in rpcb_inaddr_loopback = { |
161 | .sin_family = AF_INET, | |
162 | .sin_addr.s_addr = htonl(INADDR_LOOPBACK), | |
163 | .sin_port = htons(RPCBIND_PORT), | |
164 | }; | |
165 | ||
166 | static struct rpc_clnt *rpcb_create_local(struct sockaddr *addr, | |
167 | size_t addrlen, u32 version) | |
168 | { | |
169 | struct rpc_create_args args = { | |
170 | .protocol = XPRT_TRANSPORT_UDP, | |
171 | .address = addr, | |
172 | .addrsize = addrlen, | |
173 | .servername = "localhost", | |
174 | .program = &rpcb_program, | |
175 | .version = version, | |
176 | .authflavor = RPC_AUTH_UNIX, | |
177 | .flags = RPC_CLNT_CREATE_NOPING, | |
178 | }; | |
179 | ||
180 | return rpc_create(&args); | |
181 | } | |
182 | ||
a509050b | 183 | static struct rpc_clnt *rpcb_create(char *hostname, struct sockaddr *srvaddr, |
423d8b06 | 184 | size_t salen, int proto, u32 version) |
a509050b CL |
185 | { |
186 | struct rpc_create_args args = { | |
187 | .protocol = proto, | |
188 | .address = srvaddr, | |
9f6ad26d | 189 | .addrsize = salen, |
a509050b CL |
190 | .servername = hostname, |
191 | .program = &rpcb_program, | |
192 | .version = version, | |
193 | .authflavor = RPC_AUTH_UNIX, | |
423d8b06 CL |
194 | .flags = (RPC_CLNT_CREATE_NOPING | |
195 | RPC_CLNT_CREATE_NONPRIVPORT), | |
a509050b CL |
196 | }; |
197 | ||
d5b64430 CL |
198 | switch (srvaddr->sa_family) { |
199 | case AF_INET: | |
200 | ((struct sockaddr_in *)srvaddr)->sin_port = htons(RPCBIND_PORT); | |
201 | break; | |
202 | case AF_INET6: | |
203 | ((struct sockaddr_in6 *)srvaddr)->sin6_port = htons(RPCBIND_PORT); | |
204 | break; | |
205 | default: | |
206 | return NULL; | |
207 | } | |
208 | ||
a509050b CL |
209 | return rpc_create(&args); |
210 | } | |
211 | ||
3aba4553 | 212 | static int rpcb_register_call(const u32 version, struct rpc_message *msg) |
babe80eb | 213 | { |
fc28decd CL |
214 | struct sockaddr *addr = (struct sockaddr *)&rpcb_inaddr_loopback; |
215 | size_t addrlen = sizeof(rpcb_inaddr_loopback); | |
babe80eb | 216 | struct rpc_clnt *rpcb_clnt; |
14aeb211 | 217 | int result, error = 0; |
babe80eb | 218 | |
14aeb211 | 219 | msg->rpc_resp = &result; |
babe80eb CL |
220 | |
221 | rpcb_clnt = rpcb_create_local(addr, addrlen, version); | |
222 | if (!IS_ERR(rpcb_clnt)) { | |
223 | error = rpc_call_sync(rpcb_clnt, msg, 0); | |
224 | rpc_shutdown_client(rpcb_clnt); | |
225 | } else | |
226 | error = PTR_ERR(rpcb_clnt); | |
227 | ||
14aeb211 | 228 | if (error < 0) { |
363f724c | 229 | dprintk("RPC: failed to contact local rpcbind " |
babe80eb | 230 | "server (errno %d).\n", -error); |
14aeb211 CL |
231 | return error; |
232 | } | |
233 | ||
db820d63 | 234 | if (!result) |
14aeb211 | 235 | return -EACCES; |
14aeb211 | 236 | return 0; |
babe80eb CL |
237 | } |
238 | ||
a509050b CL |
239 | /** |
240 | * rpcb_register - set or unset a port registration with the local rpcbind svc | |
241 | * @prog: RPC program number to bind | |
242 | * @vers: RPC version number to bind | |
c2e1b09f | 243 | * @prot: transport protocol to register |
a509050b | 244 | * @port: port value to register |
14aeb211 CL |
245 | * |
246 | * Returns zero if the registration request was dispatched successfully | |
247 | * and the rpcbind daemon returned success. Otherwise, returns an errno | |
248 | * value that reflects the nature of the error (request could not be | |
249 | * dispatched, timed out, or rpcbind returned an error). | |
c2e1b09f CL |
250 | * |
251 | * RPC services invoke this function to advertise their contact | |
252 | * information via the system's rpcbind daemon. RPC services | |
253 | * invoke this function once for each [program, version, transport] | |
254 | * tuple they wish to advertise. | |
255 | * | |
256 | * Callers may also unregister RPC services that are no longer | |
257 | * available by setting the passed-in port to zero. This removes | |
258 | * all registered transports for [program, version] from the local | |
259 | * rpcbind database. | |
260 | * | |
c2e1b09f CL |
261 | * This function uses rpcbind protocol version 2 to contact the |
262 | * local rpcbind daemon. | |
263 | * | |
264 | * Registration works over both AF_INET and AF_INET6, and services | |
265 | * registered via this function are advertised as available for any | |
266 | * address. If the local rpcbind daemon is listening on AF_INET6, | |
267 | * services registered via this function will be advertised on | |
268 | * IN6ADDR_ANY (ie available for all AF_INET and AF_INET6 | |
269 | * addresses). | |
a509050b | 270 | */ |
14aeb211 | 271 | int rpcb_register(u32 prog, u32 vers, int prot, unsigned short port) |
a509050b | 272 | { |
a509050b CL |
273 | struct rpcbind_args map = { |
274 | .r_prog = prog, | |
275 | .r_vers = vers, | |
276 | .r_prot = prot, | |
277 | .r_port = port, | |
278 | }; | |
279 | struct rpc_message msg = { | |
a509050b | 280 | .rpc_argp = &map, |
a509050b | 281 | }; |
a509050b CL |
282 | |
283 | dprintk("RPC: %sregistering (%u, %u, %d, %u) with local " | |
284 | "rpcbind\n", (port ? "" : "un"), | |
285 | prog, vers, prot, port); | |
286 | ||
babe80eb CL |
287 | msg.rpc_proc = &rpcb_procedures2[RPCBPROC_UNSET]; |
288 | if (port) | |
289 | msg.rpc_proc = &rpcb_procedures2[RPCBPROC_SET]; | |
a509050b | 290 | |
fc28decd | 291 | return rpcb_register_call(RPCBVERS_2, &msg); |
a509050b CL |
292 | } |
293 | ||
c2e1b09f CL |
294 | /* |
295 | * Fill in AF_INET family-specific arguments to register | |
296 | */ | |
1673d0de CL |
297 | static int rpcb_register_inet4(const struct sockaddr *sap, |
298 | struct rpc_message *msg) | |
c2e1b09f | 299 | { |
3aba4553 | 300 | const struct sockaddr_in *sin = (const struct sockaddr_in *)sap; |
c2e1b09f | 301 | struct rpcbind_args *map = msg->rpc_argp; |
3aba4553 | 302 | unsigned short port = ntohs(sin->sin_port); |
ba809130 | 303 | int result; |
c2e1b09f | 304 | |
ba809130 | 305 | map->r_addr = rpc_sockaddr2uaddr(sap); |
c2e1b09f CL |
306 | |
307 | dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with " | |
308 | "local rpcbind\n", (port ? "" : "un"), | |
309 | map->r_prog, map->r_vers, | |
310 | map->r_addr, map->r_netid); | |
311 | ||
312 | msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET]; | |
313 | if (port) | |
314 | msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET]; | |
315 | ||
ba809130 CL |
316 | result = rpcb_register_call(RPCBVERS_4, msg); |
317 | kfree(map->r_addr); | |
318 | return result; | |
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); |
ba809130 | 330 | int result; |
c2e1b09f | 331 | |
ba809130 | 332 | map->r_addr = rpc_sockaddr2uaddr(sap); |
c2e1b09f CL |
333 | |
334 | dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with " | |
335 | "local rpcbind\n", (port ? "" : "un"), | |
336 | map->r_prog, map->r_vers, | |
337 | map->r_addr, map->r_netid); | |
338 | ||
339 | msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET]; | |
340 | if (port) | |
341 | msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET]; | |
342 | ||
ba809130 CL |
343 | result = rpcb_register_call(RPCBVERS_4, msg); |
344 | kfree(map->r_addr); | |
345 | return result; | |
c2e1b09f CL |
346 | } |
347 | ||
1673d0de CL |
348 | static int rpcb_unregister_all_protofamilies(struct rpc_message *msg) |
349 | { | |
350 | struct rpcbind_args *map = msg->rpc_argp; | |
351 | ||
352 | dprintk("RPC: unregistering [%u, %u, '%s'] with " | |
353 | "local rpcbind\n", | |
354 | map->r_prog, map->r_vers, map->r_netid); | |
355 | ||
356 | map->r_addr = ""; | |
357 | msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET]; | |
358 | ||
359 | return rpcb_register_call(RPCBVERS_4, msg); | |
360 | } | |
361 | ||
c2e1b09f CL |
362 | /** |
363 | * rpcb_v4_register - set or unset a port registration with the local rpcbind | |
364 | * @program: RPC program number of service to (un)register | |
365 | * @version: RPC version number of service to (un)register | |
366 | * @address: address family, IP address, and port to (un)register | |
367 | * @netid: netid of transport protocol to (un)register | |
14aeb211 CL |
368 | * |
369 | * Returns zero if the registration request was dispatched successfully | |
370 | * and the rpcbind daemon returned success. Otherwise, returns an errno | |
371 | * value that reflects the nature of the error (request could not be | |
372 | * dispatched, timed out, or rpcbind returned an error). | |
c2e1b09f CL |
373 | * |
374 | * RPC services invoke this function to advertise their contact | |
375 | * information via the system's rpcbind daemon. RPC services | |
376 | * invoke this function once for each [program, version, address, | |
377 | * netid] tuple they wish to advertise. | |
378 | * | |
1673d0de CL |
379 | * Callers may also unregister RPC services that are registered at a |
380 | * specific address by setting the port number in @address to zero. | |
381 | * They may unregister all registered protocol families at once for | |
382 | * a service by passing a NULL @address argument. If @netid is "" | |
383 | * then all netids for [program, version, address] are unregistered. | |
c2e1b09f | 384 | * |
c2e1b09f CL |
385 | * This function uses rpcbind protocol version 4 to contact the |
386 | * local rpcbind daemon. The local rpcbind daemon must support | |
387 | * version 4 of the rpcbind protocol in order for these functions | |
388 | * to register a service successfully. | |
389 | * | |
390 | * Supported netids include "udp" and "tcp" for UDP and TCP over | |
391 | * IPv4, and "udp6" and "tcp6" for UDP and TCP over IPv6, | |
392 | * respectively. | |
393 | * | |
394 | * The contents of @address determine the address family and the | |
395 | * port to be registered. The usual practice is to pass INADDR_ANY | |
396 | * as the raw address, but specifying a non-zero address is also | |
397 | * supported by this API if the caller wishes to advertise an RPC | |
398 | * service on a specific network interface. | |
399 | * | |
400 | * Note that passing in INADDR_ANY does not create the same service | |
401 | * registration as IN6ADDR_ANY. The former advertises an RPC | |
402 | * service on any IPv4 address, but not on IPv6. The latter | |
403 | * advertises the service on all IPv4 and IPv6 addresses. | |
404 | */ | |
405 | int rpcb_v4_register(const u32 program, const u32 version, | |
14aeb211 | 406 | const struct sockaddr *address, const char *netid) |
c2e1b09f CL |
407 | { |
408 | struct rpcbind_args map = { | |
409 | .r_prog = program, | |
410 | .r_vers = version, | |
411 | .r_netid = netid, | |
412 | .r_owner = RPCB_OWNER_STRING, | |
413 | }; | |
414 | struct rpc_message msg = { | |
415 | .rpc_argp = &map, | |
c2e1b09f CL |
416 | }; |
417 | ||
1673d0de CL |
418 | if (address == NULL) |
419 | return rpcb_unregister_all_protofamilies(&msg); | |
420 | ||
c2e1b09f CL |
421 | switch (address->sa_family) { |
422 | case AF_INET: | |
1673d0de | 423 | return rpcb_register_inet4(address, &msg); |
c2e1b09f | 424 | case AF_INET6: |
1673d0de | 425 | return rpcb_register_inet6(address, &msg); |
c2e1b09f CL |
426 | } |
427 | ||
428 | return -EAFNOSUPPORT; | |
429 | } | |
430 | ||
a509050b | 431 | /** |
cce63cd6 | 432 | * rpcb_getport_sync - obtain the port for an RPC service on a given host |
a509050b CL |
433 | * @sin: address of remote peer |
434 | * @prog: RPC program number to bind | |
435 | * @vers: RPC version number to bind | |
436 | * @prot: transport protocol to use to make this request | |
437 | * | |
67d60213 CL |
438 | * Return value is the requested advertised port number, |
439 | * or a negative errno value. | |
440 | * | |
a509050b | 441 | * Called from outside the RPC client in a synchronous task context. |
cce63cd6 | 442 | * Uses default timeout parameters specified by underlying transport. |
a509050b | 443 | * |
67d60213 | 444 | * XXX: Needs to support IPv6 |
a509050b | 445 | */ |
f1ec08cb | 446 | int rpcb_getport_sync(struct sockaddr_in *sin, u32 prog, u32 vers, int prot) |
a509050b CL |
447 | { |
448 | struct rpcbind_args map = { | |
449 | .r_prog = prog, | |
450 | .r_vers = vers, | |
451 | .r_prot = prot, | |
452 | .r_port = 0, | |
453 | }; | |
454 | struct rpc_message msg = { | |
455 | .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT], | |
456 | .rpc_argp = &map, | |
457 | .rpc_resp = &map.r_port, | |
458 | }; | |
459 | struct rpc_clnt *rpcb_clnt; | |
a509050b CL |
460 | int status; |
461 | ||
21454aaa HH |
462 | dprintk("RPC: %s(%pI4, %u, %u, %d)\n", |
463 | __func__, &sin->sin_addr.s_addr, prog, vers, prot); | |
a509050b | 464 | |
b91e101f | 465 | rpcb_clnt = rpcb_create(NULL, (struct sockaddr *)sin, |
423d8b06 | 466 | sizeof(*sin), prot, RPCBVERS_2); |
a509050b CL |
467 | if (IS_ERR(rpcb_clnt)) |
468 | return PTR_ERR(rpcb_clnt); | |
469 | ||
470 | status = rpc_call_sync(rpcb_clnt, &msg, 0); | |
90c5755f | 471 | rpc_shutdown_client(rpcb_clnt); |
a509050b CL |
472 | |
473 | if (status >= 0) { | |
474 | if (map.r_port != 0) | |
475 | return map.r_port; | |
476 | status = -EACCES; | |
477 | } | |
478 | return status; | |
479 | } | |
cce63cd6 | 480 | EXPORT_SYMBOL_GPL(rpcb_getport_sync); |
a509050b | 481 | |
803a9067 | 482 | static struct rpc_task *rpcb_call_async(struct rpc_clnt *rpcb_clnt, struct rpcbind_args *map, struct rpc_procinfo *proc) |
5138fde0 TM |
483 | { |
484 | struct rpc_message msg = { | |
803a9067 | 485 | .rpc_proc = proc, |
5138fde0 TM |
486 | .rpc_argp = map, |
487 | .rpc_resp = &map->r_port, | |
488 | }; | |
489 | struct rpc_task_setup task_setup_data = { | |
490 | .rpc_client = rpcb_clnt, | |
491 | .rpc_message = &msg, | |
492 | .callback_ops = &rpcb_getport_ops, | |
493 | .callback_data = map, | |
494 | .flags = RPC_TASK_ASYNC, | |
495 | }; | |
496 | ||
497 | return rpc_run_task(&task_setup_data); | |
498 | } | |
499 | ||
9a4bd29f TM |
500 | /* |
501 | * In the case where rpc clients have been cloned, we want to make | |
502 | * sure that we use the program number/version etc of the actual | |
503 | * owner of the xprt. To do so, we walk back up the tree of parents | |
504 | * to find whoever created the transport and/or whoever has the | |
505 | * autobind flag set. | |
506 | */ | |
507 | static struct rpc_clnt *rpcb_find_transport_owner(struct rpc_clnt *clnt) | |
508 | { | |
509 | struct rpc_clnt *parent = clnt->cl_parent; | |
510 | ||
511 | while (parent != clnt) { | |
512 | if (parent->cl_xprt != clnt->cl_xprt) | |
513 | break; | |
514 | if (clnt->cl_autobind) | |
515 | break; | |
516 | clnt = parent; | |
517 | parent = parent->cl_parent; | |
518 | } | |
519 | return clnt; | |
520 | } | |
521 | ||
a509050b | 522 | /** |
45160d62 | 523 | * rpcb_getport_async - obtain the port for a given RPC service on a given host |
a509050b CL |
524 | * @task: task that is waiting for portmapper request |
525 | * | |
526 | * This one can be called for an ongoing RPC request, and can be used in | |
527 | * an async (rpciod) context. | |
528 | */ | |
45160d62 | 529 | void rpcb_getport_async(struct rpc_task *task) |
a509050b | 530 | { |
9a4bd29f | 531 | struct rpc_clnt *clnt; |
803a9067 | 532 | struct rpc_procinfo *proc; |
0a48f5d7 | 533 | u32 bind_version; |
9a4bd29f | 534 | struct rpc_xprt *xprt; |
a509050b CL |
535 | struct rpc_clnt *rpcb_clnt; |
536 | static struct rpcbind_args *map; | |
537 | struct rpc_task *child; | |
9f6ad26d CL |
538 | struct sockaddr_storage addr; |
539 | struct sockaddr *sap = (struct sockaddr *)&addr; | |
540 | size_t salen; | |
a509050b CL |
541 | int status; |
542 | ||
9a4bd29f TM |
543 | clnt = rpcb_find_transport_owner(task->tk_client); |
544 | xprt = clnt->cl_xprt; | |
545 | ||
45160d62 | 546 | dprintk("RPC: %5u %s(%s, %u, %u, %d)\n", |
0dc47877 | 547 | task->tk_pid, __func__, |
45160d62 | 548 | clnt->cl_server, clnt->cl_prog, clnt->cl_vers, xprt->prot); |
a509050b | 549 | |
381ba74a TM |
550 | /* Put self on the wait queue to ensure we get notified if |
551 | * some other task is already attempting to bind the port */ | |
552 | rpc_sleep_on(&xprt->binding, task, NULL); | |
553 | ||
a509050b | 554 | if (xprt_test_and_set_binding(xprt)) { |
45160d62 | 555 | dprintk("RPC: %5u %s: waiting for another binder\n", |
0dc47877 | 556 | task->tk_pid, __func__); |
381ba74a | 557 | return; |
a509050b CL |
558 | } |
559 | ||
a509050b CL |
560 | /* Someone else may have bound if we slept */ |
561 | if (xprt_bound(xprt)) { | |
562 | status = 0; | |
45160d62 | 563 | dprintk("RPC: %5u %s: already bound\n", |
0dc47877 | 564 | task->tk_pid, __func__); |
a509050b CL |
565 | goto bailout_nofree; |
566 | } | |
567 | ||
ba809130 | 568 | /* Parent transport's destination address */ |
9f6ad26d | 569 | salen = rpc_peeraddr(clnt, sap, sizeof(addr)); |
d5b64430 CL |
570 | |
571 | /* Don't ever use rpcbind v2 for AF_INET6 requests */ | |
9f6ad26d | 572 | switch (sap->sa_family) { |
d5b64430 | 573 | case AF_INET: |
803a9067 TM |
574 | proc = rpcb_next_version[xprt->bind_index].rpc_proc; |
575 | bind_version = rpcb_next_version[xprt->bind_index].rpc_vers; | |
d5b64430 CL |
576 | break; |
577 | case AF_INET6: | |
803a9067 TM |
578 | proc = rpcb_next_version6[xprt->bind_index].rpc_proc; |
579 | bind_version = rpcb_next_version6[xprt->bind_index].rpc_vers; | |
d5b64430 CL |
580 | break; |
581 | default: | |
582 | status = -EAFNOSUPPORT; | |
583 | dprintk("RPC: %5u %s: bad address family\n", | |
0dc47877 | 584 | task->tk_pid, __func__); |
d5b64430 CL |
585 | goto bailout_nofree; |
586 | } | |
803a9067 | 587 | if (proc == NULL) { |
a509050b | 588 | xprt->bind_index = 0; |
906462af | 589 | status = -EPFNOSUPPORT; |
45160d62 | 590 | dprintk("RPC: %5u %s: no more getport versions available\n", |
0dc47877 | 591 | task->tk_pid, __func__); |
a509050b CL |
592 | goto bailout_nofree; |
593 | } | |
a509050b | 594 | |
45160d62 | 595 | dprintk("RPC: %5u %s: trying rpcbind version %u\n", |
0dc47877 | 596 | task->tk_pid, __func__, bind_version); |
a509050b | 597 | |
9f6ad26d | 598 | rpcb_clnt = rpcb_create(clnt->cl_server, sap, salen, xprt->prot, |
423d8b06 | 599 | bind_version); |
143b6c40 CL |
600 | if (IS_ERR(rpcb_clnt)) { |
601 | status = PTR_ERR(rpcb_clnt); | |
602 | dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n", | |
0dc47877 | 603 | task->tk_pid, __func__, PTR_ERR(rpcb_clnt)); |
143b6c40 CL |
604 | goto bailout_nofree; |
605 | } | |
606 | ||
a509050b CL |
607 | map = kzalloc(sizeof(struct rpcbind_args), GFP_ATOMIC); |
608 | if (!map) { | |
609 | status = -ENOMEM; | |
45160d62 | 610 | dprintk("RPC: %5u %s: no memory available\n", |
0dc47877 | 611 | task->tk_pid, __func__); |
96165e2b | 612 | goto bailout_release_client; |
a509050b CL |
613 | } |
614 | map->r_prog = clnt->cl_prog; | |
615 | map->r_vers = clnt->cl_vers; | |
616 | map->r_prot = xprt->prot; | |
617 | map->r_port = 0; | |
618 | map->r_xprt = xprt_get(xprt); | |
381ba74a | 619 | map->r_status = -EIO; |
a509050b | 620 | |
ba809130 CL |
621 | switch (bind_version) { |
622 | case RPCBVERS_4: | |
623 | case RPCBVERS_3: | |
624 | map->r_netid = rpc_peeraddr2str(clnt, RPC_DISPLAY_NETID); | |
625 | map->r_addr = rpc_sockaddr2uaddr(sap); | |
626 | map->r_owner = ""; | |
627 | break; | |
628 | case RPCBVERS_2: | |
629 | map->r_addr = NULL; | |
630 | break; | |
631 | default: | |
632 | BUG(); | |
633 | } | |
634 | ||
803a9067 | 635 | child = rpcb_call_async(rpcb_clnt, map, proc); |
4c402b40 | 636 | rpc_release_client(rpcb_clnt); |
a509050b | 637 | if (IS_ERR(child)) { |
0d3a34b4 | 638 | /* rpcb_map_release() has freed the arguments */ |
45160d62 | 639 | dprintk("RPC: %5u %s: rpc_run_task failed\n", |
0dc47877 | 640 | task->tk_pid, __func__); |
381ba74a | 641 | return; |
a509050b | 642 | } |
a509050b | 643 | |
9a4bd29f TM |
644 | xprt->stat.bind_count++; |
645 | rpc_put_task(child); | |
a509050b CL |
646 | return; |
647 | ||
96165e2b TM |
648 | bailout_release_client: |
649 | rpc_release_client(rpcb_clnt); | |
a509050b CL |
650 | bailout_nofree: |
651 | rpcb_wake_rpcbind_waiters(xprt, status); | |
a509050b CL |
652 | task->tk_status = status; |
653 | } | |
12444809 | 654 | EXPORT_SYMBOL_GPL(rpcb_getport_async); |
a509050b CL |
655 | |
656 | /* | |
657 | * Rpcbind child task calls this callback via tk_exit. | |
658 | */ | |
659 | static void rpcb_getport_done(struct rpc_task *child, void *data) | |
660 | { | |
661 | struct rpcbind_args *map = data; | |
662 | struct rpc_xprt *xprt = map->r_xprt; | |
663 | int status = child->tk_status; | |
664 | ||
4784cb51 CL |
665 | /* Garbage reply: retry with a lesser rpcbind version */ |
666 | if (status == -EIO) | |
667 | status = -EPROTONOSUPPORT; | |
668 | ||
a509050b CL |
669 | /* rpcbind server doesn't support this rpcbind protocol version */ |
670 | if (status == -EPROTONOSUPPORT) | |
671 | xprt->bind_index++; | |
672 | ||
673 | if (status < 0) { | |
674 | /* rpcbind server not available on remote host? */ | |
675 | xprt->ops->set_port(xprt, 0); | |
676 | } else if (map->r_port == 0) { | |
677 | /* Requested RPC service wasn't registered on remote host */ | |
678 | xprt->ops->set_port(xprt, 0); | |
679 | status = -EACCES; | |
680 | } else { | |
681 | /* Succeeded */ | |
682 | xprt->ops->set_port(xprt, map->r_port); | |
683 | xprt_set_bound(xprt); | |
684 | status = 0; | |
685 | } | |
686 | ||
687 | dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n", | |
688 | child->tk_pid, status, map->r_port); | |
689 | ||
381ba74a | 690 | map->r_status = status; |
a509050b CL |
691 | } |
692 | ||
166b88d7 CL |
693 | /* |
694 | * XDR functions for rpcbind | |
695 | */ | |
696 | ||
6f2c2db7 CL |
697 | static int rpcb_enc_mapping(struct rpc_rqst *req, __be32 *p, |
698 | const struct rpcbind_args *rpcb) | |
699 | { | |
700 | struct rpc_task *task = req->rq_task; | |
701 | struct xdr_stream xdr; | |
702 | ||
703 | dprintk("RPC: %5u encoding PMAP_%s call (%u, %u, %d, %u)\n", | |
704 | task->tk_pid, task->tk_msg.rpc_proc->p_name, | |
705 | rpcb->r_prog, rpcb->r_vers, rpcb->r_prot, rpcb->r_port); | |
706 | ||
707 | xdr_init_encode(&xdr, &req->rq_snd_buf, p); | |
708 | ||
709 | p = xdr_reserve_space(&xdr, sizeof(__be32) * RPCB_mappingargs_sz); | |
710 | if (unlikely(p == NULL)) | |
711 | return -EIO; | |
712 | ||
713 | *p++ = htonl(rpcb->r_prog); | |
714 | *p++ = htonl(rpcb->r_vers); | |
715 | *p++ = htonl(rpcb->r_prot); | |
716 | *p = htonl(rpcb->r_port); | |
717 | ||
718 | return 0; | |
719 | } | |
720 | ||
a509050b CL |
721 | static int rpcb_decode_getport(struct rpc_rqst *req, __be32 *p, |
722 | unsigned short *portp) | |
723 | { | |
724 | *portp = (unsigned short) ntohl(*p++); | |
db820d63 | 725 | dprintk("RPC: rpcb getport result: %u\n", |
a509050b CL |
726 | *portp); |
727 | return 0; | |
728 | } | |
729 | ||
730 | static int rpcb_decode_set(struct rpc_rqst *req, __be32 *p, | |
731 | unsigned int *boolp) | |
732 | { | |
733 | *boolp = (unsigned int) ntohl(*p++); | |
db820d63 | 734 | dprintk("RPC: rpcb set/unset call %s\n", |
877fcf10 | 735 | (*boolp ? "succeeded" : "failed")); |
a509050b CL |
736 | return 0; |
737 | } | |
738 | ||
6f2c2db7 CL |
739 | static int encode_rpcb_string(struct xdr_stream *xdr, const char *string, |
740 | const u32 maxstrlen) | |
741 | { | |
742 | u32 len; | |
743 | __be32 *p; | |
744 | ||
745 | if (unlikely(string == NULL)) | |
746 | return -EIO; | |
747 | len = strlen(string); | |
748 | if (unlikely(len > maxstrlen)) | |
749 | return -EIO; | |
750 | ||
751 | p = xdr_reserve_space(xdr, sizeof(__be32) + len); | |
752 | if (unlikely(p == NULL)) | |
753 | return -EIO; | |
754 | xdr_encode_opaque(p, string, len); | |
755 | ||
756 | return 0; | |
757 | } | |
758 | ||
759 | static int rpcb_enc_getaddr(struct rpc_rqst *req, __be32 *p, | |
760 | const struct rpcbind_args *rpcb) | |
761 | { | |
762 | struct rpc_task *task = req->rq_task; | |
763 | struct xdr_stream xdr; | |
764 | ||
765 | dprintk("RPC: %5u encoding RPCB_%s call (%u, %u, '%s', '%s')\n", | |
766 | task->tk_pid, task->tk_msg.rpc_proc->p_name, | |
767 | rpcb->r_prog, rpcb->r_vers, | |
768 | rpcb->r_netid, rpcb->r_addr); | |
769 | ||
770 | xdr_init_encode(&xdr, &req->rq_snd_buf, p); | |
771 | ||
772 | p = xdr_reserve_space(&xdr, | |
773 | sizeof(__be32) * (RPCB_program_sz + RPCB_version_sz)); | |
774 | if (unlikely(p == NULL)) | |
775 | return -EIO; | |
776 | *p++ = htonl(rpcb->r_prog); | |
777 | *p = htonl(rpcb->r_vers); | |
778 | ||
779 | if (encode_rpcb_string(&xdr, rpcb->r_netid, RPCBIND_MAXNETIDLEN)) | |
780 | return -EIO; | |
781 | if (encode_rpcb_string(&xdr, rpcb->r_addr, RPCBIND_MAXUADDRLEN)) | |
782 | return -EIO; | |
783 | if (encode_rpcb_string(&xdr, rpcb->r_owner, RPCB_MAXOWNERLEN)) | |
784 | return -EIO; | |
785 | ||
786 | return 0; | |
787 | } | |
788 | ||
a509050b CL |
789 | static int rpcb_decode_getaddr(struct rpc_rqst *req, __be32 *p, |
790 | unsigned short *portp) | |
791 | { | |
792 | char *addr; | |
adc24df8 CL |
793 | u32 addr_len; |
794 | int c, i, f, first, val; | |
a509050b CL |
795 | |
796 | *portp = 0; | |
adc24df8 | 797 | addr_len = ntohl(*p++); |
a509050b | 798 | |
776bd5c7 CL |
799 | if (addr_len == 0) { |
800 | dprintk("RPC: rpcb_decode_getaddr: " | |
801 | "service is not registered\n"); | |
802 | return 0; | |
803 | } | |
804 | ||
e65fe397 | 805 | /* |
776bd5c7 | 806 | * Simple sanity check. |
e65fe397 | 807 | */ |
776bd5c7 | 808 | if (addr_len > RPCBIND_MAXUADDRLEN) |
e65fe397 CL |
809 | goto out_err; |
810 | ||
811 | /* | |
812 | * Start at the end and walk backwards until the first dot | |
813 | * is encountered. When the second dot is found, we have | |
814 | * both parts of the port number. | |
815 | */ | |
a509050b CL |
816 | addr = (char *)p; |
817 | val = 0; | |
818 | first = 1; | |
819 | f = 1; | |
820 | for (i = addr_len - 1; i > 0; i--) { | |
821 | c = addr[i]; | |
822 | if (c >= '0' && c <= '9') { | |
823 | val += (c - '0') * f; | |
824 | f *= 10; | |
825 | } else if (c == '.') { | |
826 | if (first) { | |
827 | *portp = val; | |
828 | val = first = 0; | |
829 | f = 1; | |
830 | } else { | |
831 | *portp |= (val << 8); | |
832 | break; | |
833 | } | |
834 | } | |
835 | } | |
836 | ||
e65fe397 CL |
837 | /* |
838 | * Simple sanity check. If we never saw a dot in the reply, | |
839 | * then this was probably just garbage. | |
840 | */ | |
841 | if (first) | |
842 | goto out_err; | |
843 | ||
a509050b CL |
844 | dprintk("RPC: rpcb_decode_getaddr port=%u\n", *portp); |
845 | return 0; | |
e65fe397 CL |
846 | |
847 | out_err: | |
848 | dprintk("RPC: rpcbind server returned malformed reply\n"); | |
849 | return -EIO; | |
a509050b CL |
850 | } |
851 | ||
a509050b CL |
852 | #define PROC(proc, argtype, restype) \ |
853 | [RPCBPROC_##proc] = { \ | |
854 | .p_proc = RPCBPROC_##proc, \ | |
6f2c2db7 | 855 | .p_encode = (kxdrproc_t) rpcb_enc_##argtype, \ |
a509050b CL |
856 | .p_decode = (kxdrproc_t) rpcb_decode_##restype, \ |
857 | .p_arglen = RPCB_##argtype##args_sz, \ | |
858 | .p_replen = RPCB_##restype##res_sz, \ | |
859 | .p_statidx = RPCBPROC_##proc, \ | |
860 | .p_timer = 0, \ | |
861 | .p_name = #proc, \ | |
862 | } | |
863 | ||
864 | /* | |
865 | * Not all rpcbind procedures described in RFC 1833 are implemented | |
866 | * since the Linux kernel RPC code requires only these. | |
867 | */ | |
868 | static struct rpc_procinfo rpcb_procedures2[] = { | |
869 | PROC(SET, mapping, set), | |
870 | PROC(UNSET, mapping, set), | |
6a774051 | 871 | PROC(GETPORT, mapping, getport), |
a509050b CL |
872 | }; |
873 | ||
874 | static struct rpc_procinfo rpcb_procedures3[] = { | |
166b88d7 CL |
875 | PROC(SET, getaddr, set), |
876 | PROC(UNSET, getaddr, set), | |
a509050b CL |
877 | PROC(GETADDR, getaddr, getaddr), |
878 | }; | |
879 | ||
880 | static struct rpc_procinfo rpcb_procedures4[] = { | |
166b88d7 CL |
881 | PROC(SET, getaddr, set), |
882 | PROC(UNSET, getaddr, set), | |
8842413a | 883 | PROC(GETADDR, getaddr, getaddr), |
a509050b CL |
884 | PROC(GETVERSADDR, getaddr, getaddr), |
885 | }; | |
886 | ||
887 | static struct rpcb_info rpcb_next_version[] = { | |
fc200e79 CL |
888 | { |
889 | .rpc_vers = RPCBVERS_2, | |
890 | .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT], | |
891 | }, | |
892 | { | |
893 | .rpc_proc = NULL, | |
894 | }, | |
a509050b CL |
895 | }; |
896 | ||
d5b64430 | 897 | static struct rpcb_info rpcb_next_version6[] = { |
fc200e79 CL |
898 | { |
899 | .rpc_vers = RPCBVERS_4, | |
8842413a | 900 | .rpc_proc = &rpcb_procedures4[RPCBPROC_GETADDR], |
fc200e79 CL |
901 | }, |
902 | { | |
903 | .rpc_vers = RPCBVERS_3, | |
904 | .rpc_proc = &rpcb_procedures3[RPCBPROC_GETADDR], | |
905 | }, | |
fc200e79 CL |
906 | { |
907 | .rpc_proc = NULL, | |
908 | }, | |
d5b64430 CL |
909 | }; |
910 | ||
a509050b | 911 | static struct rpc_version rpcb_version2 = { |
fc200e79 | 912 | .number = RPCBVERS_2, |
a509050b CL |
913 | .nrprocs = RPCB_HIGHPROC_2, |
914 | .procs = rpcb_procedures2 | |
915 | }; | |
916 | ||
917 | static struct rpc_version rpcb_version3 = { | |
fc200e79 | 918 | .number = RPCBVERS_3, |
a509050b CL |
919 | .nrprocs = RPCB_HIGHPROC_3, |
920 | .procs = rpcb_procedures3 | |
921 | }; | |
922 | ||
923 | static struct rpc_version rpcb_version4 = { | |
fc200e79 | 924 | .number = RPCBVERS_4, |
a509050b CL |
925 | .nrprocs = RPCB_HIGHPROC_4, |
926 | .procs = rpcb_procedures4 | |
927 | }; | |
928 | ||
929 | static struct rpc_version *rpcb_version[] = { | |
930 | NULL, | |
931 | NULL, | |
932 | &rpcb_version2, | |
933 | &rpcb_version3, | |
934 | &rpcb_version4 | |
935 | }; | |
936 | ||
937 | static struct rpc_stat rpcb_stats; | |
938 | ||
7f4adeff | 939 | static struct rpc_program rpcb_program = { |
a509050b CL |
940 | .name = "rpcbind", |
941 | .number = RPCBIND_PROGRAM, | |
942 | .nrvers = ARRAY_SIZE(rpcb_version), | |
943 | .version = rpcb_version, | |
944 | .stats = &rpcb_stats, | |
945 | }; |