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. | |
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 | ||
db820d63 | 200 | if (!result) |
14aeb211 | 201 | return -EACCES; |
14aeb211 | 202 | return 0; |
babe80eb CL |
203 | } |
204 | ||
a509050b CL |
205 | /** |
206 | * rpcb_register - set or unset a port registration with the local rpcbind svc | |
207 | * @prog: RPC program number to bind | |
208 | * @vers: RPC version number to bind | |
c2e1b09f | 209 | * @prot: transport protocol to register |
a509050b | 210 | * @port: port value to register |
14aeb211 CL |
211 | * |
212 | * Returns zero if the registration request was dispatched successfully | |
213 | * and the rpcbind daemon returned success. Otherwise, returns an errno | |
214 | * value that reflects the nature of the error (request could not be | |
215 | * dispatched, timed out, or rpcbind returned an error). | |
c2e1b09f CL |
216 | * |
217 | * RPC services invoke this function to advertise their contact | |
218 | * information via the system's rpcbind daemon. RPC services | |
219 | * invoke this function once for each [program, version, transport] | |
220 | * tuple they wish to advertise. | |
221 | * | |
222 | * Callers may also unregister RPC services that are no longer | |
223 | * available by setting the passed-in port to zero. This removes | |
224 | * all registered transports for [program, version] from the local | |
225 | * rpcbind database. | |
226 | * | |
c2e1b09f CL |
227 | * This function uses rpcbind protocol version 2 to contact the |
228 | * local rpcbind daemon. | |
229 | * | |
230 | * Registration works over both AF_INET and AF_INET6, and services | |
231 | * registered via this function are advertised as available for any | |
232 | * address. If the local rpcbind daemon is listening on AF_INET6, | |
233 | * services registered via this function will be advertised on | |
234 | * IN6ADDR_ANY (ie available for all AF_INET and AF_INET6 | |
235 | * addresses). | |
a509050b | 236 | */ |
14aeb211 | 237 | int rpcb_register(u32 prog, u32 vers, int prot, unsigned short port) |
a509050b | 238 | { |
a509050b CL |
239 | struct rpcbind_args map = { |
240 | .r_prog = prog, | |
241 | .r_vers = vers, | |
242 | .r_prot = prot, | |
243 | .r_port = port, | |
244 | }; | |
245 | struct rpc_message msg = { | |
a509050b | 246 | .rpc_argp = &map, |
a509050b | 247 | }; |
a509050b CL |
248 | |
249 | dprintk("RPC: %sregistering (%u, %u, %d, %u) with local " | |
250 | "rpcbind\n", (port ? "" : "un"), | |
251 | prog, vers, prot, port); | |
252 | ||
babe80eb CL |
253 | msg.rpc_proc = &rpcb_procedures2[RPCBPROC_UNSET]; |
254 | if (port) | |
255 | msg.rpc_proc = &rpcb_procedures2[RPCBPROC_SET]; | |
a509050b | 256 | |
babe80eb CL |
257 | return rpcb_register_call((struct sockaddr *)&rpcb_inaddr_loopback, |
258 | sizeof(rpcb_inaddr_loopback), | |
14aeb211 | 259 | RPCBVERS_2, &msg); |
a509050b CL |
260 | } |
261 | ||
c2e1b09f CL |
262 | /* |
263 | * Fill in AF_INET family-specific arguments to register | |
264 | */ | |
265 | static int rpcb_register_netid4(struct sockaddr_in *address_to_register, | |
266 | struct rpc_message *msg) | |
267 | { | |
268 | struct rpcbind_args *map = msg->rpc_argp; | |
269 | unsigned short port = ntohs(address_to_register->sin_port); | |
270 | char buf[32]; | |
271 | ||
272 | /* Construct AF_INET universal address */ | |
273 | snprintf(buf, sizeof(buf), | |
274 | NIPQUAD_FMT".%u.%u", | |
275 | NIPQUAD(address_to_register->sin_addr.s_addr), | |
276 | port >> 8, port & 0xff); | |
277 | map->r_addr = buf; | |
278 | ||
279 | dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with " | |
280 | "local rpcbind\n", (port ? "" : "un"), | |
281 | map->r_prog, map->r_vers, | |
282 | map->r_addr, map->r_netid); | |
283 | ||
284 | msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET]; | |
285 | if (port) | |
286 | msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET]; | |
287 | ||
288 | return rpcb_register_call((struct sockaddr *)&rpcb_inaddr_loopback, | |
289 | sizeof(rpcb_inaddr_loopback), | |
14aeb211 | 290 | RPCBVERS_4, msg); |
c2e1b09f CL |
291 | } |
292 | ||
293 | /* | |
294 | * Fill in AF_INET6 family-specific arguments to register | |
295 | */ | |
296 | static int rpcb_register_netid6(struct sockaddr_in6 *address_to_register, | |
297 | struct rpc_message *msg) | |
298 | { | |
299 | struct rpcbind_args *map = msg->rpc_argp; | |
300 | unsigned short port = ntohs(address_to_register->sin6_port); | |
301 | char buf[64]; | |
302 | ||
303 | /* Construct AF_INET6 universal address */ | |
9d548b9c CL |
304 | if (ipv6_addr_any(&address_to_register->sin6_addr)) |
305 | snprintf(buf, sizeof(buf), "::.%u.%u", | |
306 | port >> 8, port & 0xff); | |
307 | else | |
5b095d98 | 308 | snprintf(buf, sizeof(buf), "%pI6.%u.%u", |
fdb46ee7 HH |
309 | &address_to_register->sin6_addr, |
310 | port >> 8, port & 0xff); | |
c2e1b09f CL |
311 | map->r_addr = buf; |
312 | ||
313 | dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with " | |
314 | "local rpcbind\n", (port ? "" : "un"), | |
315 | map->r_prog, map->r_vers, | |
316 | map->r_addr, map->r_netid); | |
317 | ||
318 | msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET]; | |
319 | if (port) | |
320 | msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET]; | |
321 | ||
322 | return rpcb_register_call((struct sockaddr *)&rpcb_in6addr_loopback, | |
323 | sizeof(rpcb_in6addr_loopback), | |
14aeb211 | 324 | RPCBVERS_4, msg); |
c2e1b09f CL |
325 | } |
326 | ||
327 | /** | |
328 | * rpcb_v4_register - set or unset a port registration with the local rpcbind | |
329 | * @program: RPC program number of service to (un)register | |
330 | * @version: RPC version number of service to (un)register | |
331 | * @address: address family, IP address, and port to (un)register | |
332 | * @netid: netid of transport protocol to (un)register | |
14aeb211 CL |
333 | * |
334 | * Returns zero if the registration request was dispatched successfully | |
335 | * and the rpcbind daemon returned success. Otherwise, returns an errno | |
336 | * value that reflects the nature of the error (request could not be | |
337 | * dispatched, timed out, or rpcbind returned an error). | |
c2e1b09f CL |
338 | * |
339 | * RPC services invoke this function to advertise their contact | |
340 | * information via the system's rpcbind daemon. RPC services | |
341 | * invoke this function once for each [program, version, address, | |
342 | * netid] tuple they wish to advertise. | |
343 | * | |
344 | * Callers may also unregister RPC services that are no longer | |
345 | * available by setting the port number in the passed-in address | |
346 | * to zero. Callers pass a netid of "" to unregister all | |
347 | * transport netids associated with [program, version, address]. | |
348 | * | |
c2e1b09f CL |
349 | * This function uses rpcbind protocol version 4 to contact the |
350 | * local rpcbind daemon. The local rpcbind daemon must support | |
351 | * version 4 of the rpcbind protocol in order for these functions | |
352 | * to register a service successfully. | |
353 | * | |
354 | * Supported netids include "udp" and "tcp" for UDP and TCP over | |
355 | * IPv4, and "udp6" and "tcp6" for UDP and TCP over IPv6, | |
356 | * respectively. | |
357 | * | |
358 | * The contents of @address determine the address family and the | |
359 | * port to be registered. The usual practice is to pass INADDR_ANY | |
360 | * as the raw address, but specifying a non-zero address is also | |
361 | * supported by this API if the caller wishes to advertise an RPC | |
362 | * service on a specific network interface. | |
363 | * | |
364 | * Note that passing in INADDR_ANY does not create the same service | |
365 | * registration as IN6ADDR_ANY. The former advertises an RPC | |
366 | * service on any IPv4 address, but not on IPv6. The latter | |
367 | * advertises the service on all IPv4 and IPv6 addresses. | |
368 | */ | |
369 | int rpcb_v4_register(const u32 program, const u32 version, | |
14aeb211 | 370 | const struct sockaddr *address, const char *netid) |
c2e1b09f CL |
371 | { |
372 | struct rpcbind_args map = { | |
373 | .r_prog = program, | |
374 | .r_vers = version, | |
375 | .r_netid = netid, | |
376 | .r_owner = RPCB_OWNER_STRING, | |
377 | }; | |
378 | struct rpc_message msg = { | |
379 | .rpc_argp = &map, | |
c2e1b09f CL |
380 | }; |
381 | ||
c2e1b09f CL |
382 | switch (address->sa_family) { |
383 | case AF_INET: | |
384 | return rpcb_register_netid4((struct sockaddr_in *)address, | |
385 | &msg); | |
386 | case AF_INET6: | |
387 | return rpcb_register_netid6((struct sockaddr_in6 *)address, | |
388 | &msg); | |
389 | } | |
390 | ||
391 | return -EAFNOSUPPORT; | |
392 | } | |
393 | ||
a509050b | 394 | /** |
cce63cd6 | 395 | * rpcb_getport_sync - obtain the port for an RPC service on a given host |
a509050b CL |
396 | * @sin: address of remote peer |
397 | * @prog: RPC program number to bind | |
398 | * @vers: RPC version number to bind | |
399 | * @prot: transport protocol to use to make this request | |
400 | * | |
67d60213 CL |
401 | * Return value is the requested advertised port number, |
402 | * or a negative errno value. | |
403 | * | |
a509050b | 404 | * Called from outside the RPC client in a synchronous task context. |
cce63cd6 | 405 | * Uses default timeout parameters specified by underlying transport. |
a509050b | 406 | * |
67d60213 | 407 | * XXX: Needs to support IPv6 |
a509050b | 408 | */ |
f1ec08cb | 409 | int rpcb_getport_sync(struct sockaddr_in *sin, u32 prog, u32 vers, int prot) |
a509050b CL |
410 | { |
411 | struct rpcbind_args map = { | |
412 | .r_prog = prog, | |
413 | .r_vers = vers, | |
414 | .r_prot = prot, | |
415 | .r_port = 0, | |
416 | }; | |
417 | struct rpc_message msg = { | |
418 | .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT], | |
419 | .rpc_argp = &map, | |
420 | .rpc_resp = &map.r_port, | |
421 | }; | |
422 | struct rpc_clnt *rpcb_clnt; | |
a509050b CL |
423 | int status; |
424 | ||
cce63cd6 | 425 | dprintk("RPC: %s(" NIPQUAD_FMT ", %u, %u, %d)\n", |
0dc47877 | 426 | __func__, NIPQUAD(sin->sin_addr.s_addr), prog, vers, prot); |
a509050b | 427 | |
b91e101f | 428 | rpcb_clnt = rpcb_create(NULL, (struct sockaddr *)sin, |
423d8b06 | 429 | sizeof(*sin), prot, RPCBVERS_2); |
a509050b CL |
430 | if (IS_ERR(rpcb_clnt)) |
431 | return PTR_ERR(rpcb_clnt); | |
432 | ||
433 | status = rpc_call_sync(rpcb_clnt, &msg, 0); | |
90c5755f | 434 | rpc_shutdown_client(rpcb_clnt); |
a509050b CL |
435 | |
436 | if (status >= 0) { | |
437 | if (map.r_port != 0) | |
438 | return map.r_port; | |
439 | status = -EACCES; | |
440 | } | |
441 | return status; | |
442 | } | |
cce63cd6 | 443 | EXPORT_SYMBOL_GPL(rpcb_getport_sync); |
a509050b | 444 | |
803a9067 | 445 | static struct rpc_task *rpcb_call_async(struct rpc_clnt *rpcb_clnt, struct rpcbind_args *map, struct rpc_procinfo *proc) |
5138fde0 TM |
446 | { |
447 | struct rpc_message msg = { | |
803a9067 | 448 | .rpc_proc = proc, |
5138fde0 TM |
449 | .rpc_argp = map, |
450 | .rpc_resp = &map->r_port, | |
451 | }; | |
452 | struct rpc_task_setup task_setup_data = { | |
453 | .rpc_client = rpcb_clnt, | |
454 | .rpc_message = &msg, | |
455 | .callback_ops = &rpcb_getport_ops, | |
456 | .callback_data = map, | |
457 | .flags = RPC_TASK_ASYNC, | |
458 | }; | |
459 | ||
460 | return rpc_run_task(&task_setup_data); | |
461 | } | |
462 | ||
9a4bd29f TM |
463 | /* |
464 | * In the case where rpc clients have been cloned, we want to make | |
465 | * sure that we use the program number/version etc of the actual | |
466 | * owner of the xprt. To do so, we walk back up the tree of parents | |
467 | * to find whoever created the transport and/or whoever has the | |
468 | * autobind flag set. | |
469 | */ | |
470 | static struct rpc_clnt *rpcb_find_transport_owner(struct rpc_clnt *clnt) | |
471 | { | |
472 | struct rpc_clnt *parent = clnt->cl_parent; | |
473 | ||
474 | while (parent != clnt) { | |
475 | if (parent->cl_xprt != clnt->cl_xprt) | |
476 | break; | |
477 | if (clnt->cl_autobind) | |
478 | break; | |
479 | clnt = parent; | |
480 | parent = parent->cl_parent; | |
481 | } | |
482 | return clnt; | |
483 | } | |
484 | ||
a509050b | 485 | /** |
45160d62 | 486 | * rpcb_getport_async - obtain the port for a given RPC service on a given host |
a509050b CL |
487 | * @task: task that is waiting for portmapper request |
488 | * | |
489 | * This one can be called for an ongoing RPC request, and can be used in | |
490 | * an async (rpciod) context. | |
491 | */ | |
45160d62 | 492 | void rpcb_getport_async(struct rpc_task *task) |
a509050b | 493 | { |
9a4bd29f | 494 | struct rpc_clnt *clnt; |
803a9067 | 495 | struct rpc_procinfo *proc; |
0a48f5d7 | 496 | u32 bind_version; |
9a4bd29f | 497 | struct rpc_xprt *xprt; |
a509050b CL |
498 | struct rpc_clnt *rpcb_clnt; |
499 | static struct rpcbind_args *map; | |
500 | struct rpc_task *child; | |
9f6ad26d CL |
501 | struct sockaddr_storage addr; |
502 | struct sockaddr *sap = (struct sockaddr *)&addr; | |
503 | size_t salen; | |
a509050b CL |
504 | int status; |
505 | ||
9a4bd29f TM |
506 | clnt = rpcb_find_transport_owner(task->tk_client); |
507 | xprt = clnt->cl_xprt; | |
508 | ||
45160d62 | 509 | dprintk("RPC: %5u %s(%s, %u, %u, %d)\n", |
0dc47877 | 510 | task->tk_pid, __func__, |
45160d62 | 511 | clnt->cl_server, clnt->cl_prog, clnt->cl_vers, xprt->prot); |
a509050b | 512 | |
381ba74a TM |
513 | /* Put self on the wait queue to ensure we get notified if |
514 | * some other task is already attempting to bind the port */ | |
515 | rpc_sleep_on(&xprt->binding, task, NULL); | |
516 | ||
a509050b | 517 | if (xprt_test_and_set_binding(xprt)) { |
45160d62 | 518 | dprintk("RPC: %5u %s: waiting for another binder\n", |
0dc47877 | 519 | task->tk_pid, __func__); |
381ba74a | 520 | return; |
a509050b CL |
521 | } |
522 | ||
a509050b CL |
523 | /* Someone else may have bound if we slept */ |
524 | if (xprt_bound(xprt)) { | |
525 | status = 0; | |
45160d62 | 526 | dprintk("RPC: %5u %s: already bound\n", |
0dc47877 | 527 | task->tk_pid, __func__); |
a509050b CL |
528 | goto bailout_nofree; |
529 | } | |
530 | ||
9f6ad26d | 531 | salen = rpc_peeraddr(clnt, sap, sizeof(addr)); |
d5b64430 CL |
532 | |
533 | /* Don't ever use rpcbind v2 for AF_INET6 requests */ | |
9f6ad26d | 534 | switch (sap->sa_family) { |
d5b64430 | 535 | case AF_INET: |
803a9067 TM |
536 | proc = rpcb_next_version[xprt->bind_index].rpc_proc; |
537 | bind_version = rpcb_next_version[xprt->bind_index].rpc_vers; | |
d5b64430 CL |
538 | break; |
539 | case AF_INET6: | |
803a9067 TM |
540 | proc = rpcb_next_version6[xprt->bind_index].rpc_proc; |
541 | bind_version = rpcb_next_version6[xprt->bind_index].rpc_vers; | |
d5b64430 CL |
542 | break; |
543 | default: | |
544 | status = -EAFNOSUPPORT; | |
545 | dprintk("RPC: %5u %s: bad address family\n", | |
0dc47877 | 546 | task->tk_pid, __func__); |
d5b64430 CL |
547 | goto bailout_nofree; |
548 | } | |
803a9067 | 549 | if (proc == NULL) { |
a509050b | 550 | xprt->bind_index = 0; |
906462af | 551 | status = -EPFNOSUPPORT; |
45160d62 | 552 | dprintk("RPC: %5u %s: no more getport versions available\n", |
0dc47877 | 553 | task->tk_pid, __func__); |
a509050b CL |
554 | goto bailout_nofree; |
555 | } | |
a509050b | 556 | |
45160d62 | 557 | dprintk("RPC: %5u %s: trying rpcbind version %u\n", |
0dc47877 | 558 | task->tk_pid, __func__, bind_version); |
a509050b | 559 | |
9f6ad26d | 560 | rpcb_clnt = rpcb_create(clnt->cl_server, sap, salen, xprt->prot, |
423d8b06 | 561 | bind_version); |
143b6c40 CL |
562 | if (IS_ERR(rpcb_clnt)) { |
563 | status = PTR_ERR(rpcb_clnt); | |
564 | dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n", | |
0dc47877 | 565 | task->tk_pid, __func__, PTR_ERR(rpcb_clnt)); |
143b6c40 CL |
566 | goto bailout_nofree; |
567 | } | |
568 | ||
a509050b CL |
569 | map = kzalloc(sizeof(struct rpcbind_args), GFP_ATOMIC); |
570 | if (!map) { | |
571 | status = -ENOMEM; | |
45160d62 | 572 | dprintk("RPC: %5u %s: no memory available\n", |
0dc47877 | 573 | task->tk_pid, __func__); |
96165e2b | 574 | goto bailout_release_client; |
a509050b CL |
575 | } |
576 | map->r_prog = clnt->cl_prog; | |
577 | map->r_vers = clnt->cl_vers; | |
578 | map->r_prot = xprt->prot; | |
579 | map->r_port = 0; | |
580 | map->r_xprt = xprt_get(xprt); | |
86d61d86 TM |
581 | map->r_netid = rpc_peeraddr2str(clnt, RPC_DISPLAY_NETID); |
582 | map->r_addr = rpc_peeraddr2str(rpcb_clnt, RPC_DISPLAY_UNIVERSAL_ADDR); | |
a509050b | 583 | map->r_owner = RPCB_OWNER_STRING; /* ignored for GETADDR */ |
381ba74a | 584 | map->r_status = -EIO; |
a509050b | 585 | |
803a9067 | 586 | child = rpcb_call_async(rpcb_clnt, map, proc); |
4c402b40 | 587 | rpc_release_client(rpcb_clnt); |
a509050b | 588 | if (IS_ERR(child)) { |
0d3a34b4 | 589 | /* rpcb_map_release() has freed the arguments */ |
45160d62 | 590 | dprintk("RPC: %5u %s: rpc_run_task failed\n", |
0dc47877 | 591 | task->tk_pid, __func__); |
381ba74a | 592 | return; |
a509050b | 593 | } |
a509050b | 594 | |
9a4bd29f TM |
595 | xprt->stat.bind_count++; |
596 | rpc_put_task(child); | |
a509050b CL |
597 | return; |
598 | ||
96165e2b TM |
599 | bailout_release_client: |
600 | rpc_release_client(rpcb_clnt); | |
a509050b CL |
601 | bailout_nofree: |
602 | rpcb_wake_rpcbind_waiters(xprt, status); | |
a509050b CL |
603 | task->tk_status = status; |
604 | } | |
12444809 | 605 | EXPORT_SYMBOL_GPL(rpcb_getport_async); |
a509050b CL |
606 | |
607 | /* | |
608 | * Rpcbind child task calls this callback via tk_exit. | |
609 | */ | |
610 | static void rpcb_getport_done(struct rpc_task *child, void *data) | |
611 | { | |
612 | struct rpcbind_args *map = data; | |
613 | struct rpc_xprt *xprt = map->r_xprt; | |
614 | int status = child->tk_status; | |
615 | ||
4784cb51 CL |
616 | /* Garbage reply: retry with a lesser rpcbind version */ |
617 | if (status == -EIO) | |
618 | status = -EPROTONOSUPPORT; | |
619 | ||
a509050b CL |
620 | /* rpcbind server doesn't support this rpcbind protocol version */ |
621 | if (status == -EPROTONOSUPPORT) | |
622 | xprt->bind_index++; | |
623 | ||
624 | if (status < 0) { | |
625 | /* rpcbind server not available on remote host? */ | |
626 | xprt->ops->set_port(xprt, 0); | |
627 | } else if (map->r_port == 0) { | |
628 | /* Requested RPC service wasn't registered on remote host */ | |
629 | xprt->ops->set_port(xprt, 0); | |
630 | status = -EACCES; | |
631 | } else { | |
632 | /* Succeeded */ | |
633 | xprt->ops->set_port(xprt, map->r_port); | |
634 | xprt_set_bound(xprt); | |
635 | status = 0; | |
636 | } | |
637 | ||
638 | dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n", | |
639 | child->tk_pid, status, map->r_port); | |
640 | ||
381ba74a | 641 | map->r_status = status; |
a509050b CL |
642 | } |
643 | ||
166b88d7 CL |
644 | /* |
645 | * XDR functions for rpcbind | |
646 | */ | |
647 | ||
a509050b CL |
648 | static int rpcb_encode_mapping(struct rpc_rqst *req, __be32 *p, |
649 | struct rpcbind_args *rpcb) | |
650 | { | |
db820d63 | 651 | dprintk("RPC: encoding rpcb request (%u, %u, %d, %u)\n", |
a509050b CL |
652 | rpcb->r_prog, rpcb->r_vers, rpcb->r_prot, rpcb->r_port); |
653 | *p++ = htonl(rpcb->r_prog); | |
654 | *p++ = htonl(rpcb->r_vers); | |
655 | *p++ = htonl(rpcb->r_prot); | |
656 | *p++ = htonl(rpcb->r_port); | |
657 | ||
658 | req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); | |
659 | return 0; | |
660 | } | |
661 | ||
662 | static int rpcb_decode_getport(struct rpc_rqst *req, __be32 *p, | |
663 | unsigned short *portp) | |
664 | { | |
665 | *portp = (unsigned short) ntohl(*p++); | |
db820d63 | 666 | dprintk("RPC: rpcb getport result: %u\n", |
a509050b CL |
667 | *portp); |
668 | return 0; | |
669 | } | |
670 | ||
671 | static int rpcb_decode_set(struct rpc_rqst *req, __be32 *p, | |
672 | unsigned int *boolp) | |
673 | { | |
674 | *boolp = (unsigned int) ntohl(*p++); | |
db820d63 | 675 | dprintk("RPC: rpcb set/unset call %s\n", |
877fcf10 | 676 | (*boolp ? "succeeded" : "failed")); |
a509050b CL |
677 | return 0; |
678 | } | |
679 | ||
680 | static int rpcb_encode_getaddr(struct rpc_rqst *req, __be32 *p, | |
681 | struct rpcbind_args *rpcb) | |
682 | { | |
db820d63 | 683 | dprintk("RPC: encoding rpcb request (%u, %u, %s)\n", |
a509050b CL |
684 | rpcb->r_prog, rpcb->r_vers, rpcb->r_addr); |
685 | *p++ = htonl(rpcb->r_prog); | |
686 | *p++ = htonl(rpcb->r_vers); | |
687 | ||
688 | p = xdr_encode_string(p, rpcb->r_netid); | |
689 | p = xdr_encode_string(p, rpcb->r_addr); | |
690 | p = xdr_encode_string(p, rpcb->r_owner); | |
691 | ||
692 | req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); | |
693 | ||
694 | return 0; | |
695 | } | |
696 | ||
697 | static int rpcb_decode_getaddr(struct rpc_rqst *req, __be32 *p, | |
698 | unsigned short *portp) | |
699 | { | |
700 | char *addr; | |
adc24df8 CL |
701 | u32 addr_len; |
702 | int c, i, f, first, val; | |
a509050b CL |
703 | |
704 | *portp = 0; | |
adc24df8 | 705 | addr_len = ntohl(*p++); |
a509050b | 706 | |
e65fe397 CL |
707 | /* |
708 | * Simple sanity check. The smallest possible universal | |
709 | * address is an IPv4 address string containing 11 bytes. | |
710 | */ | |
0fb2b7e9 | 711 | if (addr_len < 11 || addr_len > RPCBIND_MAXUADDRLEN) |
e65fe397 CL |
712 | goto out_err; |
713 | ||
714 | /* | |
715 | * Start at the end and walk backwards until the first dot | |
716 | * is encountered. When the second dot is found, we have | |
717 | * both parts of the port number. | |
718 | */ | |
a509050b CL |
719 | addr = (char *)p; |
720 | val = 0; | |
721 | first = 1; | |
722 | f = 1; | |
723 | for (i = addr_len - 1; i > 0; i--) { | |
724 | c = addr[i]; | |
725 | if (c >= '0' && c <= '9') { | |
726 | val += (c - '0') * f; | |
727 | f *= 10; | |
728 | } else if (c == '.') { | |
729 | if (first) { | |
730 | *portp = val; | |
731 | val = first = 0; | |
732 | f = 1; | |
733 | } else { | |
734 | *portp |= (val << 8); | |
735 | break; | |
736 | } | |
737 | } | |
738 | } | |
739 | ||
e65fe397 CL |
740 | /* |
741 | * Simple sanity check. If we never saw a dot in the reply, | |
742 | * then this was probably just garbage. | |
743 | */ | |
744 | if (first) | |
745 | goto out_err; | |
746 | ||
a509050b CL |
747 | dprintk("RPC: rpcb_decode_getaddr port=%u\n", *portp); |
748 | return 0; | |
e65fe397 CL |
749 | |
750 | out_err: | |
751 | dprintk("RPC: rpcbind server returned malformed reply\n"); | |
752 | return -EIO; | |
a509050b CL |
753 | } |
754 | ||
755 | #define RPCB_program_sz (1u) | |
756 | #define RPCB_version_sz (1u) | |
757 | #define RPCB_protocol_sz (1u) | |
758 | #define RPCB_port_sz (1u) | |
759 | #define RPCB_boolean_sz (1u) | |
760 | ||
4f40ee4a | 761 | #define RPCB_netid_sz (1+XDR_QUADLEN(RPCBIND_MAXNETIDLEN)) |
0fb2b7e9 | 762 | #define RPCB_addr_sz (1+XDR_QUADLEN(RPCBIND_MAXUADDRLEN)) |
a509050b CL |
763 | #define RPCB_ownerstring_sz (1+XDR_QUADLEN(RPCB_MAXOWNERLEN)) |
764 | ||
765 | #define RPCB_mappingargs_sz RPCB_program_sz+RPCB_version_sz+ \ | |
766 | RPCB_protocol_sz+RPCB_port_sz | |
767 | #define RPCB_getaddrargs_sz RPCB_program_sz+RPCB_version_sz+ \ | |
768 | RPCB_netid_sz+RPCB_addr_sz+ \ | |
769 | RPCB_ownerstring_sz | |
770 | ||
771 | #define RPCB_setres_sz RPCB_boolean_sz | |
772 | #define RPCB_getportres_sz RPCB_port_sz | |
773 | ||
774 | /* | |
775 | * Note that RFC 1833 does not put any size restrictions on the | |
776 | * address string returned by the remote rpcbind database. | |
777 | */ | |
778 | #define RPCB_getaddrres_sz RPCB_addr_sz | |
779 | ||
780 | #define PROC(proc, argtype, restype) \ | |
781 | [RPCBPROC_##proc] = { \ | |
782 | .p_proc = RPCBPROC_##proc, \ | |
783 | .p_encode = (kxdrproc_t) rpcb_encode_##argtype, \ | |
784 | .p_decode = (kxdrproc_t) rpcb_decode_##restype, \ | |
785 | .p_arglen = RPCB_##argtype##args_sz, \ | |
786 | .p_replen = RPCB_##restype##res_sz, \ | |
787 | .p_statidx = RPCBPROC_##proc, \ | |
788 | .p_timer = 0, \ | |
789 | .p_name = #proc, \ | |
790 | } | |
791 | ||
792 | /* | |
793 | * Not all rpcbind procedures described in RFC 1833 are implemented | |
794 | * since the Linux kernel RPC code requires only these. | |
795 | */ | |
796 | static struct rpc_procinfo rpcb_procedures2[] = { | |
797 | PROC(SET, mapping, set), | |
798 | PROC(UNSET, mapping, set), | |
6a774051 | 799 | PROC(GETPORT, mapping, getport), |
a509050b CL |
800 | }; |
801 | ||
802 | static struct rpc_procinfo rpcb_procedures3[] = { | |
166b88d7 CL |
803 | PROC(SET, getaddr, set), |
804 | PROC(UNSET, getaddr, set), | |
a509050b CL |
805 | PROC(GETADDR, getaddr, getaddr), |
806 | }; | |
807 | ||
808 | static struct rpc_procinfo rpcb_procedures4[] = { | |
166b88d7 CL |
809 | PROC(SET, getaddr, set), |
810 | PROC(UNSET, getaddr, set), | |
8842413a | 811 | PROC(GETADDR, getaddr, getaddr), |
a509050b CL |
812 | PROC(GETVERSADDR, getaddr, getaddr), |
813 | }; | |
814 | ||
815 | static struct rpcb_info rpcb_next_version[] = { | |
fc200e79 CL |
816 | { |
817 | .rpc_vers = RPCBVERS_2, | |
818 | .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT], | |
819 | }, | |
820 | { | |
821 | .rpc_proc = NULL, | |
822 | }, | |
a509050b CL |
823 | }; |
824 | ||
d5b64430 | 825 | static struct rpcb_info rpcb_next_version6[] = { |
fc200e79 CL |
826 | { |
827 | .rpc_vers = RPCBVERS_4, | |
8842413a | 828 | .rpc_proc = &rpcb_procedures4[RPCBPROC_GETADDR], |
fc200e79 CL |
829 | }, |
830 | { | |
831 | .rpc_vers = RPCBVERS_3, | |
832 | .rpc_proc = &rpcb_procedures3[RPCBPROC_GETADDR], | |
833 | }, | |
fc200e79 CL |
834 | { |
835 | .rpc_proc = NULL, | |
836 | }, | |
d5b64430 CL |
837 | }; |
838 | ||
a509050b | 839 | static struct rpc_version rpcb_version2 = { |
fc200e79 | 840 | .number = RPCBVERS_2, |
a509050b CL |
841 | .nrprocs = RPCB_HIGHPROC_2, |
842 | .procs = rpcb_procedures2 | |
843 | }; | |
844 | ||
845 | static struct rpc_version rpcb_version3 = { | |
fc200e79 | 846 | .number = RPCBVERS_3, |
a509050b CL |
847 | .nrprocs = RPCB_HIGHPROC_3, |
848 | .procs = rpcb_procedures3 | |
849 | }; | |
850 | ||
851 | static struct rpc_version rpcb_version4 = { | |
fc200e79 | 852 | .number = RPCBVERS_4, |
a509050b CL |
853 | .nrprocs = RPCB_HIGHPROC_4, |
854 | .procs = rpcb_procedures4 | |
855 | }; | |
856 | ||
857 | static struct rpc_version *rpcb_version[] = { | |
858 | NULL, | |
859 | NULL, | |
860 | &rpcb_version2, | |
861 | &rpcb_version3, | |
862 | &rpcb_version4 | |
863 | }; | |
864 | ||
865 | static struct rpc_stat rpcb_stats; | |
866 | ||
7f4adeff | 867 | static struct rpc_program rpcb_program = { |
a509050b CL |
868 | .name = "rpcbind", |
869 | .number = RPCBIND_PROGRAM, | |
870 | .nrvers = ARRAY_SIZE(rpcb_version), | |
871 | .version = rpcb_version, | |
872 | .stats = &rpcb_stats, | |
873 | }; |