blob: 78ac39fd9fe7556a71dc361406904cf8bb32d7b2 [file] [log] [blame]
Chuck Levera5090502007-03-29 16:48:04 -04001/*
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
Chuck Levercce63cd2007-07-01 12:13:12 -040015#include <linux/module.h>
16
Chuck Levera5090502007-03-29 16:48:04 -040017#include <linux/types.h>
18#include <linux/socket.h>
Chuck Lever7402ab192011-05-09 15:22:55 -040019#include <linux/un.h>
Chuck Leverd5b64432007-08-06 11:57:18 -040020#include <linux/in.h>
21#include <linux/in6.h>
Chuck Levera5090502007-03-29 16:48:04 -040022#include <linux/kernel.h>
23#include <linux/errno.h>
Chuck Leverc5266112009-12-03 15:58:56 -050024#include <linux/mutex.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090025#include <linux/slab.h>
Stanislav Kinsburskydff02d42012-01-13 12:52:10 +040026#include <linux/nsproxy.h>
Chuck Lever9d548b92008-09-15 16:27:30 -050027#include <net/ipv6.h>
Chuck Levera5090502007-03-29 16:48:04 -040028
29#include <linux/sunrpc/clnt.h>
30#include <linux/sunrpc/sched.h>
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -040031#include <linux/sunrpc/xprtsock.h>
Chuck Levera5090502007-03-29 16:48:04 -040032
Stanislav Kinsburskydff02d42012-01-13 12:52:10 +040033#include "netns.h"
34
Chuck Levera5090502007-03-29 16:48:04 -040035#ifdef RPC_DEBUG
36# define RPCDBG_FACILITY RPCDBG_BIND
37#endif
38
Chuck Lever7402ab192011-05-09 15:22:55 -040039#define RPCBIND_SOCK_PATHNAME "/var/run/rpcbind.sock"
40
Chuck Levera5090502007-03-29 16:48:04 -040041#define RPCBIND_PROGRAM (100000u)
42#define RPCBIND_PORT (111u)
43
Chuck Leverfc200e72008-06-25 17:24:31 -040044#define RPCBVERS_2 (2u)
45#define RPCBVERS_3 (3u)
46#define RPCBVERS_4 (4u)
47
Chuck Levera5090502007-03-29 16:48:04 -040048enum {
49 RPCBPROC_NULL,
50 RPCBPROC_SET,
51 RPCBPROC_UNSET,
52 RPCBPROC_GETPORT,
53 RPCBPROC_GETADDR = 3, /* alias for GETPORT */
54 RPCBPROC_DUMP,
55 RPCBPROC_CALLIT,
56 RPCBPROC_BCAST = 5, /* alias for CALLIT */
57 RPCBPROC_GETTIME,
58 RPCBPROC_UADDR2TADDR,
59 RPCBPROC_TADDR2UADDR,
60 RPCBPROC_GETVERSADDR,
61 RPCBPROC_INDIRECT,
62 RPCBPROC_GETADDRLIST,
63 RPCBPROC_GETSTAT,
64};
65
Chuck Levera5090502007-03-29 16:48:04 -040066/*
Chuck Levera5090502007-03-29 16:48:04 -040067 * r_owner
68 *
69 * The "owner" is allowed to unset a service in the rpcbind database.
Chuck Lever126e4bc2009-03-18 20:47:14 -040070 *
71 * For AF_LOCAL SET/UNSET requests, rpcbind treats this string as a
72 * UID which it maps to a local user name via a password lookup.
73 * In all other cases it is ignored.
74 *
75 * For SET/UNSET requests, user space provides a value, even for
76 * network requests, and GETADDR uses an empty string. We follow
77 * those precedents here.
Chuck Levera5090502007-03-29 16:48:04 -040078 */
Chuck Lever126e4bc2009-03-18 20:47:14 -040079#define RPCB_OWNER_STRING "0"
Chuck Levera5090502007-03-29 16:48:04 -040080#define RPCB_MAXOWNERLEN sizeof(RPCB_OWNER_STRING)
81
Chuck Lever0b10bf52009-08-09 15:09:33 -040082/*
83 * XDR data type sizes
84 */
85#define RPCB_program_sz (1)
86#define RPCB_version_sz (1)
87#define RPCB_protocol_sz (1)
88#define RPCB_port_sz (1)
89#define RPCB_boolean_sz (1)
90
91#define RPCB_netid_sz (1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN))
92#define RPCB_addr_sz (1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN))
93#define RPCB_ownerstring_sz (1 + XDR_QUADLEN(RPCB_MAXOWNERLEN))
94
95/*
96 * XDR argument and result sizes
97 */
98#define RPCB_mappingargs_sz (RPCB_program_sz + RPCB_version_sz + \
99 RPCB_protocol_sz + RPCB_port_sz)
100#define RPCB_getaddrargs_sz (RPCB_program_sz + RPCB_version_sz + \
101 RPCB_netid_sz + RPCB_addr_sz + \
102 RPCB_ownerstring_sz)
103
104#define RPCB_getportres_sz RPCB_port_sz
105#define RPCB_setres_sz RPCB_boolean_sz
106
107/*
108 * Note that RFC 1833 does not put any size restrictions on the
109 * address string returned by the remote rpcbind database.
110 */
111#define RPCB_getaddrres_sz RPCB_addr_sz
112
Chuck Levera5090502007-03-29 16:48:04 -0400113static void rpcb_getport_done(struct rpc_task *, void *);
Trond Myklebust381ba742008-07-07 12:18:53 -0400114static void rpcb_map_release(void *data);
Trond Myklebusta613fa12012-01-20 13:53:56 -0500115static const struct rpc_program rpcb_program;
Chuck Levera5090502007-03-29 16:48:04 -0400116
117struct rpcbind_args {
118 struct rpc_xprt * r_xprt;
119
120 u32 r_prog;
121 u32 r_vers;
122 u32 r_prot;
123 unsigned short r_port;
Trond Myklebust86d61d82008-01-07 21:16:56 -0500124 const char * r_netid;
125 const char * r_addr;
126 const char * r_owner;
Trond Myklebust381ba742008-07-07 12:18:53 -0400127
128 int r_status;
Chuck Levera5090502007-03-29 16:48:04 -0400129};
130
131static struct rpc_procinfo rpcb_procedures2[];
132static struct rpc_procinfo rpcb_procedures3[];
Chuck Leverc2e1b092008-07-14 16:03:30 -0400133static struct rpc_procinfo rpcb_procedures4[];
Chuck Levera5090502007-03-29 16:48:04 -0400134
Chuck Leverd5b64432007-08-06 11:57:18 -0400135struct rpcb_info {
Chuck Leverfc200e72008-06-25 17:24:31 -0400136 u32 rpc_vers;
Chuck Levera5090502007-03-29 16:48:04 -0400137 struct rpc_procinfo * rpc_proc;
Chuck Leverd5b64432007-08-06 11:57:18 -0400138};
139
Trond Myklebusta613fa12012-01-20 13:53:56 -0500140static const struct rpcb_info rpcb_next_version[];
141static const struct rpcb_info rpcb_next_version6[];
Chuck Levera5090502007-03-29 16:48:04 -0400142
Chuck Levera5090502007-03-29 16:48:04 -0400143static const struct rpc_call_ops rpcb_getport_ops = {
Chuck Levera5090502007-03-29 16:48:04 -0400144 .rpc_call_done = rpcb_getport_done,
145 .rpc_release = rpcb_map_release,
146};
147
148static void rpcb_wake_rpcbind_waiters(struct rpc_xprt *xprt, int status)
149{
150 xprt_clear_binding(xprt);
151 rpc_wake_up_status(&xprt->binding, status);
152}
153
Trond Myklebust381ba742008-07-07 12:18:53 -0400154static void rpcb_map_release(void *data)
155{
156 struct rpcbind_args *map = data;
157
158 rpcb_wake_rpcbind_waiters(map->r_xprt, map->r_status);
159 xprt_put(map->r_xprt);
Chuck Leverba809132009-08-09 15:09:35 -0400160 kfree(map->r_addr);
Trond Myklebust381ba742008-07-07 12:18:53 -0400161 kfree(map);
162}
163
Stanislav Kinsbursky2ea75a12012-01-13 12:52:18 +0400164static int rpcb_get_local(struct net *net)
Stanislav Kinsbursky914edb12011-10-25 14:16:36 +0300165{
166 int cnt;
Stanislav Kinsbursky2ea75a12012-01-13 12:52:18 +0400167 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
Stanislav Kinsbursky914edb12011-10-25 14:16:36 +0300168
Stanislav Kinsburskydff02d42012-01-13 12:52:10 +0400169 spin_lock(&sn->rpcb_clnt_lock);
170 if (sn->rpcb_users)
171 sn->rpcb_users++;
172 cnt = sn->rpcb_users;
173 spin_unlock(&sn->rpcb_clnt_lock);
Stanislav Kinsbursky914edb12011-10-25 14:16:36 +0300174
175 return cnt;
176}
177
Stanislav Kinsburskyf7a30c12012-01-13 12:52:51 +0400178void rpcb_put_local(struct net *net)
Stanislav Kinsbursky914edb12011-10-25 14:16:36 +0300179{
Stanislav Kinsburskyf7a30c12012-01-13 12:52:51 +0400180 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
Stanislav Kinsburskydff02d42012-01-13 12:52:10 +0400181 struct rpc_clnt *clnt = sn->rpcb_local_clnt;
182 struct rpc_clnt *clnt4 = sn->rpcb_local_clnt4;
Stanislav Kinsbursky914edb12011-10-25 14:16:36 +0300183 int shutdown;
184
Stanislav Kinsburskydff02d42012-01-13 12:52:10 +0400185 spin_lock(&sn->rpcb_clnt_lock);
186 if (--sn->rpcb_users == 0) {
187 sn->rpcb_local_clnt = NULL;
188 sn->rpcb_local_clnt4 = NULL;
Stanislav Kinsbursky914edb12011-10-25 14:16:36 +0300189 }
Stanislav Kinsburskydff02d42012-01-13 12:52:10 +0400190 shutdown = !sn->rpcb_users;
191 spin_unlock(&sn->rpcb_clnt_lock);
Stanislav Kinsbursky914edb12011-10-25 14:16:36 +0300192
193 if (shutdown) {
194 /*
195 * cleanup_rpcb_clnt - remove xprtsock's sysctls, unregister
196 */
197 if (clnt4)
198 rpc_shutdown_client(clnt4);
199 if (clnt)
200 rpc_shutdown_client(clnt);
201 }
202}
203
Stanislav Kinsbursky2ea75a12012-01-13 12:52:18 +0400204static void rpcb_set_local(struct net *net, struct rpc_clnt *clnt,
205 struct rpc_clnt *clnt4)
Stanislav Kinsbursky914edb12011-10-25 14:16:36 +0300206{
Stanislav Kinsbursky2ea75a12012-01-13 12:52:18 +0400207 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
Stanislav Kinsburskydff02d42012-01-13 12:52:10 +0400208
Stanislav Kinsbursky914edb12011-10-25 14:16:36 +0300209 /* Protected by rpcb_create_local_mutex */
Stanislav Kinsburskydff02d42012-01-13 12:52:10 +0400210 sn->rpcb_local_clnt = clnt;
211 sn->rpcb_local_clnt4 = clnt4;
Stanislav Kinsbursky914edb12011-10-25 14:16:36 +0300212 smp_wmb();
Stanislav Kinsburskydff02d42012-01-13 12:52:10 +0400213 sn->rpcb_users = 1;
Stanislav Kinsbursky914edb12011-10-25 14:16:36 +0300214 dprintk("RPC: created new rpcb local clients (rpcb_local_clnt: "
Stanislav Kinsbursky2ea75a12012-01-13 12:52:18 +0400215 "%p, rpcb_local_clnt4: %p) for net %p%s\n",
216 sn->rpcb_local_clnt, sn->rpcb_local_clnt4,
217 net, (net == &init_net) ? " (init_net)" : "");
Stanislav Kinsbursky914edb12011-10-25 14:16:36 +0300218}
219
Chuck Lever7402ab192011-05-09 15:22:55 -0400220/*
221 * Returns zero on success, otherwise a negative errno value
222 * is returned.
223 */
Stanislav Kinsbursky2ea75a12012-01-13 12:52:18 +0400224static int rpcb_create_local_unix(struct net *net)
Chuck Lever7402ab192011-05-09 15:22:55 -0400225{
226 static const struct sockaddr_un rpcb_localaddr_rpcbind = {
227 .sun_family = AF_LOCAL,
228 .sun_path = RPCBIND_SOCK_PATHNAME,
229 };
230 struct rpc_create_args args = {
Stanislav Kinsbursky2ea75a12012-01-13 12:52:18 +0400231 .net = net,
Chuck Lever7402ab192011-05-09 15:22:55 -0400232 .protocol = XPRT_TRANSPORT_LOCAL,
233 .address = (struct sockaddr *)&rpcb_localaddr_rpcbind,
234 .addrsize = sizeof(rpcb_localaddr_rpcbind),
235 .servername = "localhost",
236 .program = &rpcb_program,
237 .version = RPCBVERS_2,
238 .authflavor = RPC_AUTH_NULL,
239 };
240 struct rpc_clnt *clnt, *clnt4;
241 int result = 0;
Chuck Levercc5598b2008-07-14 16:03:27 -0400242
Chuck Lever7402ab192011-05-09 15:22:55 -0400243 /*
244 * Because we requested an RPC PING at transport creation time,
245 * this works only if the user space portmapper is rpcbind, and
246 * it's listening on AF_LOCAL on the named socket.
247 */
248 clnt = rpc_create(&args);
249 if (IS_ERR(clnt)) {
250 dprintk("RPC: failed to create AF_LOCAL rpcbind "
251 "client (errno %ld).\n", PTR_ERR(clnt));
252 result = -PTR_ERR(clnt);
253 goto out;
254 }
255
256 clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4);
257 if (IS_ERR(clnt4)) {
258 dprintk("RPC: failed to bind second program to "
259 "rpcbind v4 client (errno %ld).\n",
260 PTR_ERR(clnt4));
261 clnt4 = NULL;
262 }
263
Stanislav Kinsbursky2ea75a12012-01-13 12:52:18 +0400264 rpcb_set_local(net, clnt, clnt4);
Chuck Lever7402ab192011-05-09 15:22:55 -0400265
266out:
267 return result;
268}
Chuck Leverc5266112009-12-03 15:58:56 -0500269
270/*
271 * Returns zero on success, otherwise a negative errno value
272 * is returned.
273 */
Stanislav Kinsbursky2ea75a12012-01-13 12:52:18 +0400274static int rpcb_create_local_net(struct net *net)
Chuck Levercc5598b2008-07-14 16:03:27 -0400275{
Chuck Lever7402ab192011-05-09 15:22:55 -0400276 static const struct sockaddr_in rpcb_inaddr_loopback = {
277 .sin_family = AF_INET,
278 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
279 .sin_port = htons(RPCBIND_PORT),
280 };
Chuck Levercc5598b2008-07-14 16:03:27 -0400281 struct rpc_create_args args = {
Stanislav Kinsbursky2ea75a12012-01-13 12:52:18 +0400282 .net = net,
Chuck Lever2a76b3b2009-12-03 15:58:56 -0500283 .protocol = XPRT_TRANSPORT_TCP,
Chuck Lever5a462112009-12-03 15:58:56 -0500284 .address = (struct sockaddr *)&rpcb_inaddr_loopback,
285 .addrsize = sizeof(rpcb_inaddr_loopback),
Chuck Levercc5598b2008-07-14 16:03:27 -0400286 .servername = "localhost",
287 .program = &rpcb_program,
Chuck Leverc5266112009-12-03 15:58:56 -0500288 .version = RPCBVERS_2,
Chuck Levercc5598b2008-07-14 16:03:27 -0400289 .authflavor = RPC_AUTH_UNIX,
290 .flags = RPC_CLNT_CREATE_NOPING,
291 };
Chuck Leverc5266112009-12-03 15:58:56 -0500292 struct rpc_clnt *clnt, *clnt4;
293 int result = 0;
Chuck Levercc5598b2008-07-14 16:03:27 -0400294
Chuck Leverc5266112009-12-03 15:58:56 -0500295 clnt = rpc_create(&args);
296 if (IS_ERR(clnt)) {
297 dprintk("RPC: failed to create local rpcbind "
298 "client (errno %ld).\n", PTR_ERR(clnt));
299 result = -PTR_ERR(clnt);
300 goto out;
301 }
302
303 /*
304 * This results in an RPC ping. On systems running portmapper,
305 * the v4 ping will fail. Proceed anyway, but disallow rpcb
306 * v4 upcalls.
307 */
308 clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4);
309 if (IS_ERR(clnt4)) {
Chuck Lever38359352010-09-21 16:55:48 -0400310 dprintk("RPC: failed to bind second program to "
311 "rpcbind v4 client (errno %ld).\n",
312 PTR_ERR(clnt4));
Chuck Leverc5266112009-12-03 15:58:56 -0500313 clnt4 = NULL;
314 }
315
Stanislav Kinsbursky2ea75a12012-01-13 12:52:18 +0400316 rpcb_set_local(net, clnt, clnt4);
Chuck Leverc5266112009-12-03 15:58:56 -0500317
318out:
Chuck Lever7402ab192011-05-09 15:22:55 -0400319 return result;
320}
321
322/*
323 * Returns zero on success, otherwise a negative errno value
324 * is returned.
325 */
Stanislav Kinsburskyf7a30c12012-01-13 12:52:51 +0400326int rpcb_create_local(struct net *net)
Chuck Lever7402ab192011-05-09 15:22:55 -0400327{
328 static DEFINE_MUTEX(rpcb_create_local_mutex);
329 int result = 0;
330
Stanislav Kinsbursky2ea75a12012-01-13 12:52:18 +0400331 if (rpcb_get_local(net))
Chuck Lever7402ab192011-05-09 15:22:55 -0400332 return result;
333
334 mutex_lock(&rpcb_create_local_mutex);
Stanislav Kinsbursky2ea75a12012-01-13 12:52:18 +0400335 if (rpcb_get_local(net))
Chuck Lever7402ab192011-05-09 15:22:55 -0400336 goto out;
337
Stanislav Kinsbursky2ea75a12012-01-13 12:52:18 +0400338 if (rpcb_create_local_unix(net) != 0)
339 result = rpcb_create_local_net(net);
Chuck Lever7402ab192011-05-09 15:22:55 -0400340
341out:
Chuck Leverc5266112009-12-03 15:58:56 -0500342 mutex_unlock(&rpcb_create_local_mutex);
343 return result;
Chuck Levercc5598b2008-07-14 16:03:27 -0400344}
345
Trond Myklebust6eac7d32012-01-20 13:53:37 -0500346static struct rpc_clnt *rpcb_create(struct net *net, const char *hostname,
Stanislav Kinsburskyc2550e02012-01-13 12:52:35 +0400347 struct sockaddr *srvaddr, size_t salen,
348 int proto, u32 version)
Chuck Levera5090502007-03-29 16:48:04 -0400349{
350 struct rpc_create_args args = {
Stanislav Kinsburskyc2550e02012-01-13 12:52:35 +0400351 .net = net,
Chuck Levera5090502007-03-29 16:48:04 -0400352 .protocol = proto,
353 .address = srvaddr,
Chuck Lever9f6ad262007-12-10 14:56:31 -0500354 .addrsize = salen,
Chuck Levera5090502007-03-29 16:48:04 -0400355 .servername = hostname,
356 .program = &rpcb_program,
357 .version = version,
358 .authflavor = RPC_AUTH_UNIX,
Chuck Lever423d8b02008-07-14 16:03:28 -0400359 .flags = (RPC_CLNT_CREATE_NOPING |
360 RPC_CLNT_CREATE_NONPRIVPORT),
Chuck Levera5090502007-03-29 16:48:04 -0400361 };
362
Chuck Leverd5b64432007-08-06 11:57:18 -0400363 switch (srvaddr->sa_family) {
364 case AF_INET:
365 ((struct sockaddr_in *)srvaddr)->sin_port = htons(RPCBIND_PORT);
366 break;
367 case AF_INET6:
368 ((struct sockaddr_in6 *)srvaddr)->sin6_port = htons(RPCBIND_PORT);
369 break;
370 default:
Pavel Emelyanovc636b572010-10-06 13:45:56 +0400371 return ERR_PTR(-EAFNOSUPPORT);
Chuck Leverd5b64432007-08-06 11:57:18 -0400372 }
373
Chuck Levera5090502007-03-29 16:48:04 -0400374 return rpc_create(&args);
375}
376
Chuck Leverc5266112009-12-03 15:58:56 -0500377static int rpcb_register_call(struct rpc_clnt *clnt, struct rpc_message *msg)
Chuck Leverbabe80e2008-07-14 16:03:29 -0400378{
Chuck Lever14aeb212008-08-18 19:34:00 -0400379 int result, error = 0;
Chuck Leverbabe80e2008-07-14 16:03:29 -0400380
Chuck Lever14aeb212008-08-18 19:34:00 -0400381 msg->rpc_resp = &result;
Chuck Leverbabe80e2008-07-14 16:03:29 -0400382
Chuck Lever2a76b3b2009-12-03 15:58:56 -0500383 error = rpc_call_sync(clnt, msg, RPC_TASK_SOFTCONN);
Chuck Lever14aeb212008-08-18 19:34:00 -0400384 if (error < 0) {
Chuck Lever363f7242009-03-18 20:47:44 -0400385 dprintk("RPC: failed to contact local rpcbind "
Chuck Leverbabe80e2008-07-14 16:03:29 -0400386 "server (errno %d).\n", -error);
Chuck Lever14aeb212008-08-18 19:34:00 -0400387 return error;
388 }
Chuck Leverbabe80e2008-07-14 16:03:29 -0400389
Chuck Leverdb820d62008-09-25 11:57:05 -0400390 if (!result)
Chuck Lever14aeb212008-08-18 19:34:00 -0400391 return -EACCES;
Chuck Lever14aeb212008-08-18 19:34:00 -0400392 return 0;
Chuck Leverbabe80e2008-07-14 16:03:29 -0400393}
394
Chuck Levera5090502007-03-29 16:48:04 -0400395/**
396 * rpcb_register - set or unset a port registration with the local rpcbind svc
397 * @prog: RPC program number to bind
398 * @vers: RPC version number to bind
Chuck Leverc2e1b092008-07-14 16:03:30 -0400399 * @prot: transport protocol to register
Chuck Levera5090502007-03-29 16:48:04 -0400400 * @port: port value to register
Chuck Lever14aeb212008-08-18 19:34:00 -0400401 *
402 * Returns zero if the registration request was dispatched successfully
403 * and the rpcbind daemon returned success. Otherwise, returns an errno
404 * value that reflects the nature of the error (request could not be
405 * dispatched, timed out, or rpcbind returned an error).
Chuck Levera5090502007-03-29 16:48:04 -0400406 *
Chuck Leverc2e1b092008-07-14 16:03:30 -0400407 * RPC services invoke this function to advertise their contact
408 * information via the system's rpcbind daemon. RPC services
409 * invoke this function once for each [program, version, transport]
410 * tuple they wish to advertise.
Chuck Levera5090502007-03-29 16:48:04 -0400411 *
Chuck Leverc2e1b092008-07-14 16:03:30 -0400412 * Callers may also unregister RPC services that are no longer
413 * available by setting the passed-in port to zero. This removes
414 * all registered transports for [program, version] from the local
415 * rpcbind database.
416 *
Chuck Leverc2e1b092008-07-14 16:03:30 -0400417 * This function uses rpcbind protocol version 2 to contact the
418 * local rpcbind daemon.
419 *
420 * Registration works over both AF_INET and AF_INET6, and services
421 * registered via this function are advertised as available for any
422 * address. If the local rpcbind daemon is listening on AF_INET6,
423 * services registered via this function will be advertised on
424 * IN6ADDR_ANY (ie available for all AF_INET and AF_INET6
425 * addresses).
Chuck Levera5090502007-03-29 16:48:04 -0400426 */
Stanislav Kinsbursky977ac312012-01-13 12:52:43 +0400427int rpcb_register(struct net *net, u32 prog, u32 vers, int prot, unsigned short port)
Chuck Levera5090502007-03-29 16:48:04 -0400428{
Chuck Levera5090502007-03-29 16:48:04 -0400429 struct rpcbind_args map = {
430 .r_prog = prog,
431 .r_vers = vers,
432 .r_prot = prot,
433 .r_port = port,
434 };
435 struct rpc_message msg = {
Chuck Levera5090502007-03-29 16:48:04 -0400436 .rpc_argp = &map,
Chuck Levera5090502007-03-29 16:48:04 -0400437 };
Stanislav Kinsbursky977ac312012-01-13 12:52:43 +0400438 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
Chuck Levera5090502007-03-29 16:48:04 -0400439
440 dprintk("RPC: %sregistering (%u, %u, %d, %u) with local "
441 "rpcbind\n", (port ? "" : "un"),
442 prog, vers, prot, port);
443
Chuck Leverbabe80e2008-07-14 16:03:29 -0400444 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_UNSET];
445 if (port)
446 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_SET];
447
Stanislav Kinsburskydff02d42012-01-13 12:52:10 +0400448 return rpcb_register_call(sn->rpcb_local_clnt, &msg);
Chuck Levera5090502007-03-29 16:48:04 -0400449}
450
Chuck Leverc2e1b092008-07-14 16:03:30 -0400451/*
452 * Fill in AF_INET family-specific arguments to register
453 */
Stanislav Kinsbursky1a114a62012-01-13 12:52:26 +0400454static int rpcb_register_inet4(struct sunrpc_net *sn,
455 const struct sockaddr *sap,
Chuck Lever1673d0d2009-03-18 20:47:21 -0400456 struct rpc_message *msg)
Chuck Leverc2e1b092008-07-14 16:03:30 -0400457{
Chuck Lever3aba4552009-03-18 20:47:06 -0400458 const struct sockaddr_in *sin = (const struct sockaddr_in *)sap;
Chuck Leverc2e1b092008-07-14 16:03:30 -0400459 struct rpcbind_args *map = msg->rpc_argp;
Chuck Lever3aba4552009-03-18 20:47:06 -0400460 unsigned short port = ntohs(sin->sin_port);
Chuck Leverba809132009-08-09 15:09:35 -0400461 int result;
Chuck Leverc2e1b092008-07-14 16:03:30 -0400462
Trond Myklebustd77385f2011-10-17 16:08:10 -0700463 map->r_addr = rpc_sockaddr2uaddr(sap, GFP_KERNEL);
Chuck Leverc2e1b092008-07-14 16:03:30 -0400464
465 dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with "
466 "local rpcbind\n", (port ? "" : "un"),
467 map->r_prog, map->r_vers,
468 map->r_addr, map->r_netid);
469
470 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
471 if (port)
472 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
473
Stanislav Kinsburskydff02d42012-01-13 12:52:10 +0400474 result = rpcb_register_call(sn->rpcb_local_clnt4, msg);
Chuck Leverba809132009-08-09 15:09:35 -0400475 kfree(map->r_addr);
476 return result;
Chuck Leverc2e1b092008-07-14 16:03:30 -0400477}
478
479/*
480 * Fill in AF_INET6 family-specific arguments to register
481 */
Stanislav Kinsbursky1a114a62012-01-13 12:52:26 +0400482static int rpcb_register_inet6(struct sunrpc_net *sn,
483 const struct sockaddr *sap,
Chuck Lever1673d0d2009-03-18 20:47:21 -0400484 struct rpc_message *msg)
Chuck Leverc2e1b092008-07-14 16:03:30 -0400485{
Chuck Lever3aba4552009-03-18 20:47:06 -0400486 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sap;
Chuck Leverc2e1b092008-07-14 16:03:30 -0400487 struct rpcbind_args *map = msg->rpc_argp;
Chuck Lever3aba4552009-03-18 20:47:06 -0400488 unsigned short port = ntohs(sin6->sin6_port);
Chuck Leverba809132009-08-09 15:09:35 -0400489 int result;
Chuck Leverc2e1b092008-07-14 16:03:30 -0400490
Trond Myklebustd77385f2011-10-17 16:08:10 -0700491 map->r_addr = rpc_sockaddr2uaddr(sap, GFP_KERNEL);
Chuck Leverc2e1b092008-07-14 16:03:30 -0400492
493 dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with "
494 "local rpcbind\n", (port ? "" : "un"),
495 map->r_prog, map->r_vers,
496 map->r_addr, map->r_netid);
497
498 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
499 if (port)
500 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
501
Stanislav Kinsburskydff02d42012-01-13 12:52:10 +0400502 result = rpcb_register_call(sn->rpcb_local_clnt4, msg);
Chuck Leverba809132009-08-09 15:09:35 -0400503 kfree(map->r_addr);
504 return result;
Chuck Leverc2e1b092008-07-14 16:03:30 -0400505}
506
Stanislav Kinsbursky1a114a62012-01-13 12:52:26 +0400507static int rpcb_unregister_all_protofamilies(struct sunrpc_net *sn,
508 struct rpc_message *msg)
Chuck Lever1673d0d2009-03-18 20:47:21 -0400509{
510 struct rpcbind_args *map = msg->rpc_argp;
511
512 dprintk("RPC: unregistering [%u, %u, '%s'] with "
513 "local rpcbind\n",
514 map->r_prog, map->r_vers, map->r_netid);
515
516 map->r_addr = "";
517 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
518
Stanislav Kinsburskydff02d42012-01-13 12:52:10 +0400519 return rpcb_register_call(sn->rpcb_local_clnt4, msg);
Chuck Lever1673d0d2009-03-18 20:47:21 -0400520}
521
Chuck Leverc2e1b092008-07-14 16:03:30 -0400522/**
523 * rpcb_v4_register - set or unset a port registration with the local rpcbind
524 * @program: RPC program number of service to (un)register
525 * @version: RPC version number of service to (un)register
526 * @address: address family, IP address, and port to (un)register
527 * @netid: netid of transport protocol to (un)register
Chuck Lever14aeb212008-08-18 19:34:00 -0400528 *
529 * Returns zero if the registration request was dispatched successfully
530 * and the rpcbind daemon returned success. Otherwise, returns an errno
531 * value that reflects the nature of the error (request could not be
532 * dispatched, timed out, or rpcbind returned an error).
Chuck Leverc2e1b092008-07-14 16:03:30 -0400533 *
534 * RPC services invoke this function to advertise their contact
535 * information via the system's rpcbind daemon. RPC services
536 * invoke this function once for each [program, version, address,
537 * netid] tuple they wish to advertise.
538 *
Chuck Lever1673d0d2009-03-18 20:47:21 -0400539 * Callers may also unregister RPC services that are registered at a
540 * specific address by setting the port number in @address to zero.
541 * They may unregister all registered protocol families at once for
542 * a service by passing a NULL @address argument. If @netid is ""
543 * then all netids for [program, version, address] are unregistered.
Chuck Leverc2e1b092008-07-14 16:03:30 -0400544 *
Chuck Leverc2e1b092008-07-14 16:03:30 -0400545 * This function uses rpcbind protocol version 4 to contact the
546 * local rpcbind daemon. The local rpcbind daemon must support
547 * version 4 of the rpcbind protocol in order for these functions
548 * to register a service successfully.
549 *
550 * Supported netids include "udp" and "tcp" for UDP and TCP over
551 * IPv4, and "udp6" and "tcp6" for UDP and TCP over IPv6,
552 * respectively.
553 *
554 * The contents of @address determine the address family and the
555 * port to be registered. The usual practice is to pass INADDR_ANY
556 * as the raw address, but specifying a non-zero address is also
557 * supported by this API if the caller wishes to advertise an RPC
558 * service on a specific network interface.
559 *
560 * Note that passing in INADDR_ANY does not create the same service
561 * registration as IN6ADDR_ANY. The former advertises an RPC
562 * service on any IPv4 address, but not on IPv6. The latter
563 * advertises the service on all IPv4 and IPv6 addresses.
564 */
Stanislav Kinsbursky977ac312012-01-13 12:52:43 +0400565int rpcb_v4_register(struct net *net, const u32 program, const u32 version,
Chuck Lever14aeb212008-08-18 19:34:00 -0400566 const struct sockaddr *address, const char *netid)
Chuck Leverc2e1b092008-07-14 16:03:30 -0400567{
568 struct rpcbind_args map = {
569 .r_prog = program,
570 .r_vers = version,
571 .r_netid = netid,
572 .r_owner = RPCB_OWNER_STRING,
573 };
574 struct rpc_message msg = {
575 .rpc_argp = &map,
Chuck Leverc2e1b092008-07-14 16:03:30 -0400576 };
Stanislav Kinsbursky977ac312012-01-13 12:52:43 +0400577 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
Chuck Leverc5266112009-12-03 15:58:56 -0500578
Stanislav Kinsburskydff02d42012-01-13 12:52:10 +0400579 if (sn->rpcb_local_clnt4 == NULL)
Chuck Leverc5266112009-12-03 15:58:56 -0500580 return -EPROTONOSUPPORT;
Chuck Leverc2e1b092008-07-14 16:03:30 -0400581
Chuck Lever1673d0d2009-03-18 20:47:21 -0400582 if (address == NULL)
Stanislav Kinsbursky1a114a62012-01-13 12:52:26 +0400583 return rpcb_unregister_all_protofamilies(sn, &msg);
Chuck Lever1673d0d2009-03-18 20:47:21 -0400584
Chuck Leverc2e1b092008-07-14 16:03:30 -0400585 switch (address->sa_family) {
586 case AF_INET:
Stanislav Kinsbursky1a114a62012-01-13 12:52:26 +0400587 return rpcb_register_inet4(sn, address, &msg);
Chuck Leverc2e1b092008-07-14 16:03:30 -0400588 case AF_INET6:
Stanislav Kinsbursky1a114a62012-01-13 12:52:26 +0400589 return rpcb_register_inet6(sn, address, &msg);
Chuck Leverc2e1b092008-07-14 16:03:30 -0400590 }
591
592 return -EAFNOSUPPORT;
593}
594
Trond Myklebust803a9062008-07-01 15:20:55 -0400595static struct rpc_task *rpcb_call_async(struct rpc_clnt *rpcb_clnt, struct rpcbind_args *map, struct rpc_procinfo *proc)
Trond Myklebust5138fde2007-07-14 15:40:01 -0400596{
597 struct rpc_message msg = {
Trond Myklebust803a9062008-07-01 15:20:55 -0400598 .rpc_proc = proc,
Trond Myklebust5138fde2007-07-14 15:40:01 -0400599 .rpc_argp = map,
Chuck Leverc0c077d2009-08-09 15:09:43 -0400600 .rpc_resp = map,
Trond Myklebust5138fde2007-07-14 15:40:01 -0400601 };
602 struct rpc_task_setup task_setup_data = {
603 .rpc_client = rpcb_clnt,
604 .rpc_message = &msg,
605 .callback_ops = &rpcb_getport_ops,
606 .callback_data = map,
Chuck Lever012da152009-12-03 15:58:56 -0500607 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFTCONN,
Trond Myklebust5138fde2007-07-14 15:40:01 -0400608 };
609
610 return rpc_run_task(&task_setup_data);
611}
612
Trond Myklebust9a4bd292008-10-03 16:48:34 -0400613/*
614 * In the case where rpc clients have been cloned, we want to make
615 * sure that we use the program number/version etc of the actual
616 * owner of the xprt. To do so, we walk back up the tree of parents
617 * to find whoever created the transport and/or whoever has the
618 * autobind flag set.
619 */
620static struct rpc_clnt *rpcb_find_transport_owner(struct rpc_clnt *clnt)
621{
622 struct rpc_clnt *parent = clnt->cl_parent;
Trond Myklebust2446ab62012-03-01 17:00:56 -0500623 struct rpc_xprt *xprt = rcu_dereference(clnt->cl_xprt);
Trond Myklebust9a4bd292008-10-03 16:48:34 -0400624
625 while (parent != clnt) {
Trond Myklebust2446ab62012-03-01 17:00:56 -0500626 if (rcu_dereference(parent->cl_xprt) != xprt)
Trond Myklebust9a4bd292008-10-03 16:48:34 -0400627 break;
628 if (clnt->cl_autobind)
629 break;
630 clnt = parent;
631 parent = parent->cl_parent;
632 }
633 return clnt;
634}
635
Chuck Levera5090502007-03-29 16:48:04 -0400636/**
Chuck Lever45160d62007-07-01 12:13:17 -0400637 * rpcb_getport_async - obtain the port for a given RPC service on a given host
Chuck Levera5090502007-03-29 16:48:04 -0400638 * @task: task that is waiting for portmapper request
639 *
640 * This one can be called for an ongoing RPC request, and can be used in
641 * an async (rpciod) context.
642 */
Chuck Lever45160d62007-07-01 12:13:17 -0400643void rpcb_getport_async(struct rpc_task *task)
Chuck Levera5090502007-03-29 16:48:04 -0400644{
Trond Myklebust9a4bd292008-10-03 16:48:34 -0400645 struct rpc_clnt *clnt;
Trond Myklebust803a9062008-07-01 15:20:55 -0400646 struct rpc_procinfo *proc;
Chuck Lever0a48f5d2007-12-10 14:56:38 -0500647 u32 bind_version;
Trond Myklebust9a4bd292008-10-03 16:48:34 -0400648 struct rpc_xprt *xprt;
Chuck Levera5090502007-03-29 16:48:04 -0400649 struct rpc_clnt *rpcb_clnt;
Ben Greearec0dd262011-07-12 10:27:55 -0700650 struct rpcbind_args *map;
Chuck Levera5090502007-03-29 16:48:04 -0400651 struct rpc_task *child;
Chuck Lever9f6ad262007-12-10 14:56:31 -0500652 struct sockaddr_storage addr;
653 struct sockaddr *sap = (struct sockaddr *)&addr;
654 size_t salen;
Chuck Levera5090502007-03-29 16:48:04 -0400655 int status;
656
Trond Myklebust2446ab62012-03-01 17:00:56 -0500657 rcu_read_lock();
658 do {
659 clnt = rpcb_find_transport_owner(task->tk_client);
660 xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
661 } while (xprt == NULL);
662 rcu_read_unlock();
Trond Myklebust9a4bd292008-10-03 16:48:34 -0400663
Chuck Lever45160d62007-07-01 12:13:17 -0400664 dprintk("RPC: %5u %s(%s, %u, %u, %d)\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800665 task->tk_pid, __func__,
Trond Myklebust4e0038b2012-03-01 17:01:05 -0500666 xprt->servername, clnt->cl_prog, clnt->cl_vers, xprt->prot);
Chuck Levera5090502007-03-29 16:48:04 -0400667
Trond Myklebust381ba742008-07-07 12:18:53 -0400668 /* Put self on the wait queue to ensure we get notified if
669 * some other task is already attempting to bind the port */
670 rpc_sleep_on(&xprt->binding, task, NULL);
671
Chuck Levera5090502007-03-29 16:48:04 -0400672 if (xprt_test_and_set_binding(xprt)) {
Chuck Lever45160d62007-07-01 12:13:17 -0400673 dprintk("RPC: %5u %s: waiting for another binder\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800674 task->tk_pid, __func__);
Trond Myklebust2446ab62012-03-01 17:00:56 -0500675 xprt_put(xprt);
Trond Myklebust381ba742008-07-07 12:18:53 -0400676 return;
Chuck Levera5090502007-03-29 16:48:04 -0400677 }
678
Chuck Levera5090502007-03-29 16:48:04 -0400679 /* Someone else may have bound if we slept */
680 if (xprt_bound(xprt)) {
681 status = 0;
Chuck Lever45160d62007-07-01 12:13:17 -0400682 dprintk("RPC: %5u %s: already bound\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800683 task->tk_pid, __func__);
Chuck Levera5090502007-03-29 16:48:04 -0400684 goto bailout_nofree;
685 }
686
Chuck Leverba809132009-08-09 15:09:35 -0400687 /* Parent transport's destination address */
Chuck Lever9f6ad262007-12-10 14:56:31 -0500688 salen = rpc_peeraddr(clnt, sap, sizeof(addr));
Chuck Leverd5b64432007-08-06 11:57:18 -0400689
690 /* Don't ever use rpcbind v2 for AF_INET6 requests */
Chuck Lever9f6ad262007-12-10 14:56:31 -0500691 switch (sap->sa_family) {
Chuck Leverd5b64432007-08-06 11:57:18 -0400692 case AF_INET:
Trond Myklebust803a9062008-07-01 15:20:55 -0400693 proc = rpcb_next_version[xprt->bind_index].rpc_proc;
694 bind_version = rpcb_next_version[xprt->bind_index].rpc_vers;
Chuck Leverd5b64432007-08-06 11:57:18 -0400695 break;
696 case AF_INET6:
Trond Myklebust803a9062008-07-01 15:20:55 -0400697 proc = rpcb_next_version6[xprt->bind_index].rpc_proc;
698 bind_version = rpcb_next_version6[xprt->bind_index].rpc_vers;
Chuck Leverd5b64432007-08-06 11:57:18 -0400699 break;
700 default:
701 status = -EAFNOSUPPORT;
702 dprintk("RPC: %5u %s: bad address family\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800703 task->tk_pid, __func__);
Chuck Leverd5b64432007-08-06 11:57:18 -0400704 goto bailout_nofree;
705 }
Trond Myklebust803a9062008-07-01 15:20:55 -0400706 if (proc == NULL) {
Chuck Levera5090502007-03-29 16:48:04 -0400707 xprt->bind_index = 0;
Chuck Lever906462a2007-09-11 18:00:47 -0400708 status = -EPFNOSUPPORT;
Chuck Lever45160d62007-07-01 12:13:17 -0400709 dprintk("RPC: %5u %s: no more getport versions available\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800710 task->tk_pid, __func__);
Chuck Levera5090502007-03-29 16:48:04 -0400711 goto bailout_nofree;
712 }
Chuck Levera5090502007-03-29 16:48:04 -0400713
Chuck Lever45160d62007-07-01 12:13:17 -0400714 dprintk("RPC: %5u %s: trying rpcbind version %u\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800715 task->tk_pid, __func__, bind_version);
Chuck Levera5090502007-03-29 16:48:04 -0400716
Trond Myklebust4e0038b2012-03-01 17:01:05 -0500717 rpcb_clnt = rpcb_create(xprt->xprt_net, xprt->servername, sap, salen,
Stanislav Kinsburskyc2550e02012-01-13 12:52:35 +0400718 xprt->prot, bind_version);
Chuck Lever143b6c42007-08-16 16:03:31 -0400719 if (IS_ERR(rpcb_clnt)) {
720 status = PTR_ERR(rpcb_clnt);
721 dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800722 task->tk_pid, __func__, PTR_ERR(rpcb_clnt));
Chuck Lever143b6c42007-08-16 16:03:31 -0400723 goto bailout_nofree;
724 }
725
Chuck Levera5090502007-03-29 16:48:04 -0400726 map = kzalloc(sizeof(struct rpcbind_args), GFP_ATOMIC);
727 if (!map) {
728 status = -ENOMEM;
Chuck Lever45160d62007-07-01 12:13:17 -0400729 dprintk("RPC: %5u %s: no memory available\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800730 task->tk_pid, __func__);
Trond Myklebust96165e22008-10-03 16:48:40 -0400731 goto bailout_release_client;
Chuck Levera5090502007-03-29 16:48:04 -0400732 }
733 map->r_prog = clnt->cl_prog;
734 map->r_vers = clnt->cl_vers;
735 map->r_prot = xprt->prot;
736 map->r_port = 0;
Bryan Schumaker864cf9b2012-03-27 13:46:32 -0400737 map->r_xprt = xprt;
Trond Myklebust381ba742008-07-07 12:18:53 -0400738 map->r_status = -EIO;
Chuck Levera5090502007-03-29 16:48:04 -0400739
Chuck Leverba809132009-08-09 15:09:35 -0400740 switch (bind_version) {
741 case RPCBVERS_4:
742 case RPCBVERS_3:
Trond Myklebust2446ab62012-03-01 17:00:56 -0500743 map->r_netid = xprt->address_strings[RPC_DISPLAY_NETID];
Trond Myklebustd77385f2011-10-17 16:08:10 -0700744 map->r_addr = rpc_sockaddr2uaddr(sap, GFP_ATOMIC);
Chuck Leverba809132009-08-09 15:09:35 -0400745 map->r_owner = "";
746 break;
747 case RPCBVERS_2:
748 map->r_addr = NULL;
749 break;
750 default:
751 BUG();
752 }
753
Trond Myklebust803a9062008-07-01 15:20:55 -0400754 child = rpcb_call_async(rpcb_clnt, map, proc);
Trond Myklebust4c402b42007-06-14 16:40:32 -0400755 rpc_release_client(rpcb_clnt);
Chuck Levera5090502007-03-29 16:48:04 -0400756 if (IS_ERR(child)) {
Trond Myklebust0d3a34b2008-07-07 12:18:52 -0400757 /* rpcb_map_release() has freed the arguments */
Chuck Lever45160d62007-07-01 12:13:17 -0400758 dprintk("RPC: %5u %s: rpc_run_task failed\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800759 task->tk_pid, __func__);
Trond Myklebust381ba742008-07-07 12:18:53 -0400760 return;
Chuck Levera5090502007-03-29 16:48:04 -0400761 }
Chuck Levera5090502007-03-29 16:48:04 -0400762
Trond Myklebust9a4bd292008-10-03 16:48:34 -0400763 xprt->stat.bind_count++;
764 rpc_put_task(child);
Chuck Levera5090502007-03-29 16:48:04 -0400765 return;
766
Trond Myklebust96165e22008-10-03 16:48:40 -0400767bailout_release_client:
768 rpc_release_client(rpcb_clnt);
Chuck Levera5090502007-03-29 16:48:04 -0400769bailout_nofree:
770 rpcb_wake_rpcbind_waiters(xprt, status);
Chuck Levera5090502007-03-29 16:48:04 -0400771 task->tk_status = status;
Trond Myklebust2446ab62012-03-01 17:00:56 -0500772 xprt_put(xprt);
Chuck Levera5090502007-03-29 16:48:04 -0400773}
\"Talpey, Thomas\12444802007-09-10 13:45:36 -0400774EXPORT_SYMBOL_GPL(rpcb_getport_async);
Chuck Levera5090502007-03-29 16:48:04 -0400775
776/*
777 * Rpcbind child task calls this callback via tk_exit.
778 */
779static void rpcb_getport_done(struct rpc_task *child, void *data)
780{
781 struct rpcbind_args *map = data;
782 struct rpc_xprt *xprt = map->r_xprt;
783 int status = child->tk_status;
784
Chuck Lever4784cb52007-09-11 18:00:36 -0400785 /* Garbage reply: retry with a lesser rpcbind version */
786 if (status == -EIO)
787 status = -EPROTONOSUPPORT;
788
Chuck Levera5090502007-03-29 16:48:04 -0400789 /* rpcbind server doesn't support this rpcbind protocol version */
790 if (status == -EPROTONOSUPPORT)
791 xprt->bind_index++;
792
793 if (status < 0) {
794 /* rpcbind server not available on remote host? */
795 xprt->ops->set_port(xprt, 0);
796 } else if (map->r_port == 0) {
797 /* Requested RPC service wasn't registered on remote host */
798 xprt->ops->set_port(xprt, 0);
799 status = -EACCES;
800 } else {
801 /* Succeeded */
802 xprt->ops->set_port(xprt, map->r_port);
803 xprt_set_bound(xprt);
804 status = 0;
805 }
806
807 dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n",
808 child->tk_pid, status, map->r_port);
809
Trond Myklebust381ba742008-07-07 12:18:53 -0400810 map->r_status = status;
Chuck Levera5090502007-03-29 16:48:04 -0400811}
812
Chuck Lever166b88d2008-07-14 16:03:26 -0400813/*
814 * XDR functions for rpcbind
815 */
816
Chuck Lever9f06c712010-12-14 14:59:18 +0000817static void rpcb_enc_mapping(struct rpc_rqst *req, struct xdr_stream *xdr,
818 const struct rpcbind_args *rpcb)
Chuck Lever6f2c2db2009-08-09 15:09:40 -0400819{
Chuck Lever9f06c712010-12-14 14:59:18 +0000820 __be32 *p;
Chuck Lever6f2c2db2009-08-09 15:09:40 -0400821
822 dprintk("RPC: %5u encoding PMAP_%s call (%u, %u, %d, %u)\n",
Trond Myklebustffa94db2012-03-20 09:22:00 -0400823 req->rq_task->tk_pid,
824 req->rq_task->tk_msg.rpc_proc->p_name,
Chuck Lever6f2c2db2009-08-09 15:09:40 -0400825 rpcb->r_prog, rpcb->r_vers, rpcb->r_prot, rpcb->r_port);
826
Chuck Lever9f06c712010-12-14 14:59:18 +0000827 p = xdr_reserve_space(xdr, RPCB_mappingargs_sz << 2);
Chuck Lever4129ccf2010-12-14 14:58:59 +0000828 *p++ = cpu_to_be32(rpcb->r_prog);
829 *p++ = cpu_to_be32(rpcb->r_vers);
830 *p++ = cpu_to_be32(rpcb->r_prot);
831 *p = cpu_to_be32(rpcb->r_port);
Chuck Lever6f2c2db2009-08-09 15:09:40 -0400832}
833
Chuck Leverbf269552010-12-14 14:59:29 +0000834static int rpcb_dec_getport(struct rpc_rqst *req, struct xdr_stream *xdr,
Chuck Leverc0c077d2009-08-09 15:09:43 -0400835 struct rpcbind_args *rpcb)
836{
Chuck Leverc0c077d2009-08-09 15:09:43 -0400837 unsigned long port;
Chuck Leverbf269552010-12-14 14:59:29 +0000838 __be32 *p;
Chuck Leverc0c077d2009-08-09 15:09:43 -0400839
840 rpcb->r_port = 0;
841
Chuck Leverbf269552010-12-14 14:59:29 +0000842 p = xdr_inline_decode(xdr, 4);
Chuck Leverc0c077d2009-08-09 15:09:43 -0400843 if (unlikely(p == NULL))
844 return -EIO;
845
Chuck Lever4129ccf2010-12-14 14:58:59 +0000846 port = be32_to_cpup(p);
Trond Myklebustffa94db2012-03-20 09:22:00 -0400847 dprintk("RPC: %5u PMAP_%s result: %lu\n", req->rq_task->tk_pid,
848 req->rq_task->tk_msg.rpc_proc->p_name, port);
Alexey Dobriyan4be929b2010-05-24 14:33:03 -0700849 if (unlikely(port > USHRT_MAX))
Chuck Leverc0c077d2009-08-09 15:09:43 -0400850 return -EIO;
851
852 rpcb->r_port = port;
853 return 0;
854}
855
Chuck Leverbf269552010-12-14 14:59:29 +0000856static int rpcb_dec_set(struct rpc_rqst *req, struct xdr_stream *xdr,
Chuck Lever7ed0ff92009-08-09 15:09:42 -0400857 unsigned int *boolp)
858{
Chuck Leverbf269552010-12-14 14:59:29 +0000859 __be32 *p;
Chuck Lever7ed0ff92009-08-09 15:09:42 -0400860
Chuck Leverbf269552010-12-14 14:59:29 +0000861 p = xdr_inline_decode(xdr, 4);
Chuck Lever7ed0ff92009-08-09 15:09:42 -0400862 if (unlikely(p == NULL))
863 return -EIO;
864
865 *boolp = 0;
Chuck Leverbf269552010-12-14 14:59:29 +0000866 if (*p != xdr_zero)
Chuck Lever7ed0ff92009-08-09 15:09:42 -0400867 *boolp = 1;
868
869 dprintk("RPC: %5u RPCB_%s call %s\n",
Trond Myklebustffa94db2012-03-20 09:22:00 -0400870 req->rq_task->tk_pid,
871 req->rq_task->tk_msg.rpc_proc->p_name,
Chuck Lever7ed0ff92009-08-09 15:09:42 -0400872 (*boolp ? "succeeded" : "failed"));
873 return 0;
874}
875
Chuck Lever4129ccf2010-12-14 14:58:59 +0000876static void encode_rpcb_string(struct xdr_stream *xdr, const char *string,
877 const u32 maxstrlen)
Chuck Lever6f2c2db2009-08-09 15:09:40 -0400878{
Chuck Lever6f2c2db2009-08-09 15:09:40 -0400879 __be32 *p;
Chuck Lever4129ccf2010-12-14 14:58:59 +0000880 u32 len;
Chuck Lever6f2c2db2009-08-09 15:09:40 -0400881
Chuck Lever6f2c2db2009-08-09 15:09:40 -0400882 len = strlen(string);
Chuck Lever4129ccf2010-12-14 14:58:59 +0000883 BUG_ON(len > maxstrlen);
884 p = xdr_reserve_space(xdr, 4 + len);
Chuck Lever6f2c2db2009-08-09 15:09:40 -0400885 xdr_encode_opaque(p, string, len);
Chuck Lever6f2c2db2009-08-09 15:09:40 -0400886}
887
Chuck Lever9f06c712010-12-14 14:59:18 +0000888static void rpcb_enc_getaddr(struct rpc_rqst *req, struct xdr_stream *xdr,
889 const struct rpcbind_args *rpcb)
Chuck Lever6f2c2db2009-08-09 15:09:40 -0400890{
Chuck Lever9f06c712010-12-14 14:59:18 +0000891 __be32 *p;
Chuck Lever6f2c2db2009-08-09 15:09:40 -0400892
893 dprintk("RPC: %5u encoding RPCB_%s call (%u, %u, '%s', '%s')\n",
Trond Myklebustffa94db2012-03-20 09:22:00 -0400894 req->rq_task->tk_pid,
895 req->rq_task->tk_msg.rpc_proc->p_name,
Chuck Lever6f2c2db2009-08-09 15:09:40 -0400896 rpcb->r_prog, rpcb->r_vers,
897 rpcb->r_netid, rpcb->r_addr);
898
Chuck Lever9f06c712010-12-14 14:59:18 +0000899 p = xdr_reserve_space(xdr, (RPCB_program_sz + RPCB_version_sz) << 2);
Chuck Lever4129ccf2010-12-14 14:58:59 +0000900 *p++ = cpu_to_be32(rpcb->r_prog);
901 *p = cpu_to_be32(rpcb->r_vers);
Chuck Lever6f2c2db2009-08-09 15:09:40 -0400902
Chuck Lever9f06c712010-12-14 14:59:18 +0000903 encode_rpcb_string(xdr, rpcb->r_netid, RPCBIND_MAXNETIDLEN);
904 encode_rpcb_string(xdr, rpcb->r_addr, RPCBIND_MAXUADDRLEN);
905 encode_rpcb_string(xdr, rpcb->r_owner, RPCB_MAXOWNERLEN);
Chuck Lever6f2c2db2009-08-09 15:09:40 -0400906}
907
Chuck Leverbf269552010-12-14 14:59:29 +0000908static int rpcb_dec_getaddr(struct rpc_rqst *req, struct xdr_stream *xdr,
Chuck Leverc0c077d2009-08-09 15:09:43 -0400909 struct rpcbind_args *rpcb)
910{
911 struct sockaddr_storage address;
912 struct sockaddr *sap = (struct sockaddr *)&address;
Chuck Leverbf269552010-12-14 14:59:29 +0000913 __be32 *p;
Chuck Leverc0c077d2009-08-09 15:09:43 -0400914 u32 len;
915
916 rpcb->r_port = 0;
917
Chuck Leverbf269552010-12-14 14:59:29 +0000918 p = xdr_inline_decode(xdr, 4);
Chuck Leverc0c077d2009-08-09 15:09:43 -0400919 if (unlikely(p == NULL))
920 goto out_fail;
Chuck Lever4129ccf2010-12-14 14:58:59 +0000921 len = be32_to_cpup(p);
Chuck Leverc0c077d2009-08-09 15:09:43 -0400922
923 /*
924 * If the returned universal address is a null string,
925 * the requested RPC service was not registered.
926 */
927 if (len == 0) {
928 dprintk("RPC: %5u RPCB reply: program not registered\n",
Trond Myklebustffa94db2012-03-20 09:22:00 -0400929 req->rq_task->tk_pid);
Chuck Leverc0c077d2009-08-09 15:09:43 -0400930 return 0;
931 }
932
933 if (unlikely(len > RPCBIND_MAXUADDRLEN))
934 goto out_fail;
935
Chuck Leverbf269552010-12-14 14:59:29 +0000936 p = xdr_inline_decode(xdr, len);
Chuck Leverc0c077d2009-08-09 15:09:43 -0400937 if (unlikely(p == NULL))
938 goto out_fail;
Trond Myklebustffa94db2012-03-20 09:22:00 -0400939 dprintk("RPC: %5u RPCB_%s reply: %s\n", req->rq_task->tk_pid,
940 req->rq_task->tk_msg.rpc_proc->p_name, (char *)p);
Chuck Leverc0c077d2009-08-09 15:09:43 -0400941
Stanislav Kinsburskyb030fb02012-01-13 14:02:40 +0400942 if (rpc_uaddr2sockaddr(req->rq_xprt->xprt_net, (char *)p, len,
943 sap, sizeof(address)) == 0)
Chuck Leverc0c077d2009-08-09 15:09:43 -0400944 goto out_fail;
945 rpcb->r_port = rpc_get_port(sap);
946
947 return 0;
948
949out_fail:
950 dprintk("RPC: %5u malformed RPCB_%s reply\n",
Trond Myklebustffa94db2012-03-20 09:22:00 -0400951 req->rq_task->tk_pid,
952 req->rq_task->tk_msg.rpc_proc->p_name);
Chuck Leverc0c077d2009-08-09 15:09:43 -0400953 return -EIO;
954}
955
Chuck Levera5090502007-03-29 16:48:04 -0400956/*
957 * Not all rpcbind procedures described in RFC 1833 are implemented
958 * since the Linux kernel RPC code requires only these.
959 */
Chuck Leverf8b761e2009-08-09 15:09:44 -0400960
Chuck Levera5090502007-03-29 16:48:04 -0400961static struct rpc_procinfo rpcb_procedures2[] = {
Chuck Leverf8b761e2009-08-09 15:09:44 -0400962 [RPCBPROC_SET] = {
963 .p_proc = RPCBPROC_SET,
Chuck Lever9f06c712010-12-14 14:59:18 +0000964 .p_encode = (kxdreproc_t)rpcb_enc_mapping,
Chuck Leverbf269552010-12-14 14:59:29 +0000965 .p_decode = (kxdrdproc_t)rpcb_dec_set,
Chuck Leverf8b761e2009-08-09 15:09:44 -0400966 .p_arglen = RPCB_mappingargs_sz,
967 .p_replen = RPCB_setres_sz,
968 .p_statidx = RPCBPROC_SET,
969 .p_timer = 0,
970 .p_name = "SET",
971 },
972 [RPCBPROC_UNSET] = {
973 .p_proc = RPCBPROC_UNSET,
Chuck Lever9f06c712010-12-14 14:59:18 +0000974 .p_encode = (kxdreproc_t)rpcb_enc_mapping,
Chuck Leverbf269552010-12-14 14:59:29 +0000975 .p_decode = (kxdrdproc_t)rpcb_dec_set,
Chuck Leverf8b761e2009-08-09 15:09:44 -0400976 .p_arglen = RPCB_mappingargs_sz,
977 .p_replen = RPCB_setres_sz,
978 .p_statidx = RPCBPROC_UNSET,
979 .p_timer = 0,
980 .p_name = "UNSET",
981 },
982 [RPCBPROC_GETPORT] = {
983 .p_proc = RPCBPROC_GETPORT,
Chuck Lever9f06c712010-12-14 14:59:18 +0000984 .p_encode = (kxdreproc_t)rpcb_enc_mapping,
Chuck Leverbf269552010-12-14 14:59:29 +0000985 .p_decode = (kxdrdproc_t)rpcb_dec_getport,
Chuck Leverf8b761e2009-08-09 15:09:44 -0400986 .p_arglen = RPCB_mappingargs_sz,
987 .p_replen = RPCB_getportres_sz,
988 .p_statidx = RPCBPROC_GETPORT,
989 .p_timer = 0,
990 .p_name = "GETPORT",
991 },
Chuck Levera5090502007-03-29 16:48:04 -0400992};
993
994static struct rpc_procinfo rpcb_procedures3[] = {
Chuck Leverf8b761e2009-08-09 15:09:44 -0400995 [RPCBPROC_SET] = {
996 .p_proc = RPCBPROC_SET,
Chuck Lever9f06c712010-12-14 14:59:18 +0000997 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
Chuck Leverbf269552010-12-14 14:59:29 +0000998 .p_decode = (kxdrdproc_t)rpcb_dec_set,
Chuck Leverf8b761e2009-08-09 15:09:44 -0400999 .p_arglen = RPCB_getaddrargs_sz,
1000 .p_replen = RPCB_setres_sz,
1001 .p_statidx = RPCBPROC_SET,
1002 .p_timer = 0,
1003 .p_name = "SET",
1004 },
1005 [RPCBPROC_UNSET] = {
1006 .p_proc = RPCBPROC_UNSET,
Chuck Lever9f06c712010-12-14 14:59:18 +00001007 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
Chuck Leverbf269552010-12-14 14:59:29 +00001008 .p_decode = (kxdrdproc_t)rpcb_dec_set,
Chuck Leverf8b761e2009-08-09 15:09:44 -04001009 .p_arglen = RPCB_getaddrargs_sz,
1010 .p_replen = RPCB_setres_sz,
1011 .p_statidx = RPCBPROC_UNSET,
1012 .p_timer = 0,
1013 .p_name = "UNSET",
1014 },
1015 [RPCBPROC_GETADDR] = {
1016 .p_proc = RPCBPROC_GETADDR,
Chuck Lever9f06c712010-12-14 14:59:18 +00001017 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
Chuck Leverbf269552010-12-14 14:59:29 +00001018 .p_decode = (kxdrdproc_t)rpcb_dec_getaddr,
Chuck Leverf8b761e2009-08-09 15:09:44 -04001019 .p_arglen = RPCB_getaddrargs_sz,
1020 .p_replen = RPCB_getaddrres_sz,
1021 .p_statidx = RPCBPROC_GETADDR,
1022 .p_timer = 0,
1023 .p_name = "GETADDR",
1024 },
Chuck Levera5090502007-03-29 16:48:04 -04001025};
1026
1027static struct rpc_procinfo rpcb_procedures4[] = {
Chuck Leverf8b761e2009-08-09 15:09:44 -04001028 [RPCBPROC_SET] = {
1029 .p_proc = RPCBPROC_SET,
Chuck Lever9f06c712010-12-14 14:59:18 +00001030 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
Chuck Leverbf269552010-12-14 14:59:29 +00001031 .p_decode = (kxdrdproc_t)rpcb_dec_set,
Chuck Leverf8b761e2009-08-09 15:09:44 -04001032 .p_arglen = RPCB_getaddrargs_sz,
1033 .p_replen = RPCB_setres_sz,
1034 .p_statidx = RPCBPROC_SET,
1035 .p_timer = 0,
1036 .p_name = "SET",
1037 },
1038 [RPCBPROC_UNSET] = {
1039 .p_proc = RPCBPROC_UNSET,
Chuck Lever9f06c712010-12-14 14:59:18 +00001040 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
Chuck Leverbf269552010-12-14 14:59:29 +00001041 .p_decode = (kxdrdproc_t)rpcb_dec_set,
Chuck Leverf8b761e2009-08-09 15:09:44 -04001042 .p_arglen = RPCB_getaddrargs_sz,
1043 .p_replen = RPCB_setres_sz,
1044 .p_statidx = RPCBPROC_UNSET,
1045 .p_timer = 0,
1046 .p_name = "UNSET",
1047 },
1048 [RPCBPROC_GETADDR] = {
1049 .p_proc = RPCBPROC_GETADDR,
Chuck Lever9f06c712010-12-14 14:59:18 +00001050 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
Chuck Leverbf269552010-12-14 14:59:29 +00001051 .p_decode = (kxdrdproc_t)rpcb_dec_getaddr,
Chuck Leverf8b761e2009-08-09 15:09:44 -04001052 .p_arglen = RPCB_getaddrargs_sz,
1053 .p_replen = RPCB_getaddrres_sz,
1054 .p_statidx = RPCBPROC_GETADDR,
1055 .p_timer = 0,
1056 .p_name = "GETADDR",
1057 },
Chuck Levera5090502007-03-29 16:48:04 -04001058};
1059
Trond Myklebusta613fa12012-01-20 13:53:56 -05001060static const struct rpcb_info rpcb_next_version[] = {
Chuck Leverfc200e72008-06-25 17:24:31 -04001061 {
1062 .rpc_vers = RPCBVERS_2,
1063 .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT],
1064 },
1065 {
1066 .rpc_proc = NULL,
1067 },
Chuck Levera5090502007-03-29 16:48:04 -04001068};
1069
Trond Myklebusta613fa12012-01-20 13:53:56 -05001070static const struct rpcb_info rpcb_next_version6[] = {
Chuck Leverfc200e72008-06-25 17:24:31 -04001071 {
1072 .rpc_vers = RPCBVERS_4,
Chuck Lever88424132008-06-25 17:24:47 -04001073 .rpc_proc = &rpcb_procedures4[RPCBPROC_GETADDR],
Chuck Leverfc200e72008-06-25 17:24:31 -04001074 },
1075 {
1076 .rpc_vers = RPCBVERS_3,
1077 .rpc_proc = &rpcb_procedures3[RPCBPROC_GETADDR],
1078 },
Chuck Leverfc200e72008-06-25 17:24:31 -04001079 {
1080 .rpc_proc = NULL,
1081 },
Chuck Leverd5b64432007-08-06 11:57:18 -04001082};
1083
Trond Myklebusta613fa12012-01-20 13:53:56 -05001084static const struct rpc_version rpcb_version2 = {
Chuck Leverfc200e72008-06-25 17:24:31 -04001085 .number = RPCBVERS_2,
Chuck Lever1ac7c232010-12-14 14:59:09 +00001086 .nrprocs = ARRAY_SIZE(rpcb_procedures2),
Chuck Levera5090502007-03-29 16:48:04 -04001087 .procs = rpcb_procedures2
1088};
1089
Trond Myklebusta613fa12012-01-20 13:53:56 -05001090static const struct rpc_version rpcb_version3 = {
Chuck Leverfc200e72008-06-25 17:24:31 -04001091 .number = RPCBVERS_3,
Chuck Lever1ac7c232010-12-14 14:59:09 +00001092 .nrprocs = ARRAY_SIZE(rpcb_procedures3),
Chuck Levera5090502007-03-29 16:48:04 -04001093 .procs = rpcb_procedures3
1094};
1095
Trond Myklebusta613fa12012-01-20 13:53:56 -05001096static const struct rpc_version rpcb_version4 = {
Chuck Leverfc200e72008-06-25 17:24:31 -04001097 .number = RPCBVERS_4,
Chuck Lever1ac7c232010-12-14 14:59:09 +00001098 .nrprocs = ARRAY_SIZE(rpcb_procedures4),
Chuck Levera5090502007-03-29 16:48:04 -04001099 .procs = rpcb_procedures4
1100};
1101
Trond Myklebusta613fa12012-01-20 13:53:56 -05001102static const struct rpc_version *rpcb_version[] = {
Chuck Levera5090502007-03-29 16:48:04 -04001103 NULL,
1104 NULL,
1105 &rpcb_version2,
1106 &rpcb_version3,
1107 &rpcb_version4
1108};
1109
1110static struct rpc_stat rpcb_stats;
1111
Trond Myklebusta613fa12012-01-20 13:53:56 -05001112static const struct rpc_program rpcb_program = {
Chuck Levera5090502007-03-29 16:48:04 -04001113 .name = "rpcbind",
1114 .number = RPCBIND_PROGRAM,
1115 .nrvers = ARRAY_SIZE(rpcb_version),
1116 .version = rpcb_version,
1117 .stats = &rpcb_stats,
1118};