blob: a70acae496e44d6c872ba7c93d4d9ce56c2f7f00 [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 Kinsbursky9793f7c2012-05-02 16:08:38 +0400183 int shutdown = 0;
Stanislav Kinsbursky914edb12011-10-25 14:16:36 +0300184
Stanislav Kinsburskydff02d42012-01-13 12:52:10 +0400185 spin_lock(&sn->rpcb_clnt_lock);
Stanislav Kinsbursky9793f7c2012-05-02 16:08:38 +0400186 if (sn->rpcb_users) {
187 if (--sn->rpcb_users == 0) {
188 sn->rpcb_local_clnt = NULL;
189 sn->rpcb_local_clnt4 = NULL;
190 }
191 shutdown = !sn->rpcb_users;
Stanislav Kinsbursky914edb12011-10-25 14:16:36 +0300192 }
Stanislav Kinsburskydff02d42012-01-13 12:52:10 +0400193 spin_unlock(&sn->rpcb_clnt_lock);
Stanislav Kinsbursky914edb12011-10-25 14:16:36 +0300194
195 if (shutdown) {
196 /*
197 * cleanup_rpcb_clnt - remove xprtsock's sysctls, unregister
198 */
199 if (clnt4)
200 rpc_shutdown_client(clnt4);
201 if (clnt)
202 rpc_shutdown_client(clnt);
203 }
204}
205
Stanislav Kinsbursky2ea75a12012-01-13 12:52:18 +0400206static void rpcb_set_local(struct net *net, struct rpc_clnt *clnt,
207 struct rpc_clnt *clnt4)
Stanislav Kinsbursky914edb12011-10-25 14:16:36 +0300208{
Stanislav Kinsbursky2ea75a12012-01-13 12:52:18 +0400209 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
Stanislav Kinsburskydff02d42012-01-13 12:52:10 +0400210
Stanislav Kinsbursky914edb12011-10-25 14:16:36 +0300211 /* Protected by rpcb_create_local_mutex */
Stanislav Kinsburskydff02d42012-01-13 12:52:10 +0400212 sn->rpcb_local_clnt = clnt;
213 sn->rpcb_local_clnt4 = clnt4;
Stanislav Kinsbursky914edb12011-10-25 14:16:36 +0300214 smp_wmb();
Stanislav Kinsburskydff02d42012-01-13 12:52:10 +0400215 sn->rpcb_users = 1;
Stanislav Kinsbursky914edb12011-10-25 14:16:36 +0300216 dprintk("RPC: created new rpcb local clients (rpcb_local_clnt: "
Stanislav Kinsbursky2ea75a12012-01-13 12:52:18 +0400217 "%p, rpcb_local_clnt4: %p) for net %p%s\n",
218 sn->rpcb_local_clnt, sn->rpcb_local_clnt4,
219 net, (net == &init_net) ? " (init_net)" : "");
Stanislav Kinsbursky914edb12011-10-25 14:16:36 +0300220}
221
Chuck Lever7402ab192011-05-09 15:22:55 -0400222/*
223 * Returns zero on success, otherwise a negative errno value
224 * is returned.
225 */
Stanislav Kinsbursky2ea75a12012-01-13 12:52:18 +0400226static int rpcb_create_local_unix(struct net *net)
Chuck Lever7402ab192011-05-09 15:22:55 -0400227{
228 static const struct sockaddr_un rpcb_localaddr_rpcbind = {
229 .sun_family = AF_LOCAL,
230 .sun_path = RPCBIND_SOCK_PATHNAME,
231 };
232 struct rpc_create_args args = {
Stanislav Kinsbursky2ea75a12012-01-13 12:52:18 +0400233 .net = net,
Chuck Lever7402ab192011-05-09 15:22:55 -0400234 .protocol = XPRT_TRANSPORT_LOCAL,
235 .address = (struct sockaddr *)&rpcb_localaddr_rpcbind,
236 .addrsize = sizeof(rpcb_localaddr_rpcbind),
237 .servername = "localhost",
238 .program = &rpcb_program,
239 .version = RPCBVERS_2,
240 .authflavor = RPC_AUTH_NULL,
241 };
242 struct rpc_clnt *clnt, *clnt4;
243 int result = 0;
Chuck Levercc5598b2008-07-14 16:03:27 -0400244
Chuck Lever7402ab192011-05-09 15:22:55 -0400245 /*
246 * Because we requested an RPC PING at transport creation time,
247 * this works only if the user space portmapper is rpcbind, and
248 * it's listening on AF_LOCAL on the named socket.
249 */
250 clnt = rpc_create(&args);
251 if (IS_ERR(clnt)) {
252 dprintk("RPC: failed to create AF_LOCAL rpcbind "
253 "client (errno %ld).\n", PTR_ERR(clnt));
Stanislav Kinsburskycaea33d2012-07-20 15:57:48 +0400254 result = PTR_ERR(clnt);
Chuck Lever7402ab192011-05-09 15:22:55 -0400255 goto out;
256 }
257
258 clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4);
259 if (IS_ERR(clnt4)) {
260 dprintk("RPC: failed to bind second program to "
261 "rpcbind v4 client (errno %ld).\n",
262 PTR_ERR(clnt4));
263 clnt4 = NULL;
264 }
265
Stanislav Kinsbursky2ea75a12012-01-13 12:52:18 +0400266 rpcb_set_local(net, clnt, clnt4);
Chuck Lever7402ab192011-05-09 15:22:55 -0400267
268out:
269 return result;
270}
Chuck Leverc5266112009-12-03 15:58:56 -0500271
272/*
273 * Returns zero on success, otherwise a negative errno value
274 * is returned.
275 */
Stanislav Kinsbursky2ea75a12012-01-13 12:52:18 +0400276static int rpcb_create_local_net(struct net *net)
Chuck Levercc5598b2008-07-14 16:03:27 -0400277{
Chuck Lever7402ab192011-05-09 15:22:55 -0400278 static const struct sockaddr_in rpcb_inaddr_loopback = {
279 .sin_family = AF_INET,
280 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
281 .sin_port = htons(RPCBIND_PORT),
282 };
Chuck Levercc5598b2008-07-14 16:03:27 -0400283 struct rpc_create_args args = {
Stanislav Kinsbursky2ea75a12012-01-13 12:52:18 +0400284 .net = net,
Chuck Lever2a76b3b2009-12-03 15:58:56 -0500285 .protocol = XPRT_TRANSPORT_TCP,
Chuck Lever5a462112009-12-03 15:58:56 -0500286 .address = (struct sockaddr *)&rpcb_inaddr_loopback,
287 .addrsize = sizeof(rpcb_inaddr_loopback),
Chuck Levercc5598b2008-07-14 16:03:27 -0400288 .servername = "localhost",
289 .program = &rpcb_program,
Chuck Leverc5266112009-12-03 15:58:56 -0500290 .version = RPCBVERS_2,
Chuck Levercc5598b2008-07-14 16:03:27 -0400291 .authflavor = RPC_AUTH_UNIX,
292 .flags = RPC_CLNT_CREATE_NOPING,
293 };
Chuck Leverc5266112009-12-03 15:58:56 -0500294 struct rpc_clnt *clnt, *clnt4;
295 int result = 0;
Chuck Levercc5598b2008-07-14 16:03:27 -0400296
Chuck Leverc5266112009-12-03 15:58:56 -0500297 clnt = rpc_create(&args);
298 if (IS_ERR(clnt)) {
299 dprintk("RPC: failed to create local rpcbind "
300 "client (errno %ld).\n", PTR_ERR(clnt));
Stanislav Kinsburskycaea33d2012-07-20 15:57:48 +0400301 result = PTR_ERR(clnt);
Chuck Leverc5266112009-12-03 15:58:56 -0500302 goto out;
303 }
304
305 /*
306 * This results in an RPC ping. On systems running portmapper,
307 * the v4 ping will fail. Proceed anyway, but disallow rpcb
308 * v4 upcalls.
309 */
310 clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4);
311 if (IS_ERR(clnt4)) {
Chuck Lever38359352010-09-21 16:55:48 -0400312 dprintk("RPC: failed to bind second program to "
313 "rpcbind v4 client (errno %ld).\n",
314 PTR_ERR(clnt4));
Chuck Leverc5266112009-12-03 15:58:56 -0500315 clnt4 = NULL;
316 }
317
Stanislav Kinsbursky2ea75a12012-01-13 12:52:18 +0400318 rpcb_set_local(net, clnt, clnt4);
Chuck Leverc5266112009-12-03 15:58:56 -0500319
320out:
Chuck Lever7402ab192011-05-09 15:22:55 -0400321 return result;
322}
323
324/*
325 * Returns zero on success, otherwise a negative errno value
326 * is returned.
327 */
Stanislav Kinsburskyf7a30c12012-01-13 12:52:51 +0400328int rpcb_create_local(struct net *net)
Chuck Lever7402ab192011-05-09 15:22:55 -0400329{
330 static DEFINE_MUTEX(rpcb_create_local_mutex);
331 int result = 0;
332
Stanislav Kinsbursky2ea75a12012-01-13 12:52:18 +0400333 if (rpcb_get_local(net))
Chuck Lever7402ab192011-05-09 15:22:55 -0400334 return result;
335
336 mutex_lock(&rpcb_create_local_mutex);
Stanislav Kinsbursky2ea75a12012-01-13 12:52:18 +0400337 if (rpcb_get_local(net))
Chuck Lever7402ab192011-05-09 15:22:55 -0400338 goto out;
339
Stanislav Kinsbursky2ea75a12012-01-13 12:52:18 +0400340 if (rpcb_create_local_unix(net) != 0)
341 result = rpcb_create_local_net(net);
Chuck Lever7402ab192011-05-09 15:22:55 -0400342
343out:
Chuck Leverc5266112009-12-03 15:58:56 -0500344 mutex_unlock(&rpcb_create_local_mutex);
345 return result;
Chuck Levercc5598b2008-07-14 16:03:27 -0400346}
347
Trond Myklebust6eac7d32012-01-20 13:53:37 -0500348static struct rpc_clnt *rpcb_create(struct net *net, const char *hostname,
Stanislav Kinsburskyc2550e02012-01-13 12:52:35 +0400349 struct sockaddr *srvaddr, size_t salen,
350 int proto, u32 version)
Chuck Levera5090502007-03-29 16:48:04 -0400351{
352 struct rpc_create_args args = {
Stanislav Kinsburskyc2550e02012-01-13 12:52:35 +0400353 .net = net,
Chuck Levera5090502007-03-29 16:48:04 -0400354 .protocol = proto,
355 .address = srvaddr,
Chuck Lever9f6ad262007-12-10 14:56:31 -0500356 .addrsize = salen,
Chuck Levera5090502007-03-29 16:48:04 -0400357 .servername = hostname,
358 .program = &rpcb_program,
359 .version = version,
360 .authflavor = RPC_AUTH_UNIX,
Chuck Lever423d8b02008-07-14 16:03:28 -0400361 .flags = (RPC_CLNT_CREATE_NOPING |
362 RPC_CLNT_CREATE_NONPRIVPORT),
Chuck Levera5090502007-03-29 16:48:04 -0400363 };
364
Chuck Leverd5b64432007-08-06 11:57:18 -0400365 switch (srvaddr->sa_family) {
366 case AF_INET:
367 ((struct sockaddr_in *)srvaddr)->sin_port = htons(RPCBIND_PORT);
368 break;
369 case AF_INET6:
370 ((struct sockaddr_in6 *)srvaddr)->sin6_port = htons(RPCBIND_PORT);
371 break;
372 default:
Pavel Emelyanovc636b572010-10-06 13:45:56 +0400373 return ERR_PTR(-EAFNOSUPPORT);
Chuck Leverd5b64432007-08-06 11:57:18 -0400374 }
375
Chuck Levera5090502007-03-29 16:48:04 -0400376 return rpc_create(&args);
377}
378
Chuck Leverc5266112009-12-03 15:58:56 -0500379static int rpcb_register_call(struct rpc_clnt *clnt, struct rpc_message *msg)
Chuck Leverbabe80e2008-07-14 16:03:29 -0400380{
Chuck Lever14aeb212008-08-18 19:34:00 -0400381 int result, error = 0;
Chuck Leverbabe80e2008-07-14 16:03:29 -0400382
Chuck Lever14aeb212008-08-18 19:34:00 -0400383 msg->rpc_resp = &result;
Chuck Leverbabe80e2008-07-14 16:03:29 -0400384
Chuck Lever2a76b3b2009-12-03 15:58:56 -0500385 error = rpc_call_sync(clnt, msg, RPC_TASK_SOFTCONN);
Chuck Lever14aeb212008-08-18 19:34:00 -0400386 if (error < 0) {
Chuck Lever363f7242009-03-18 20:47:44 -0400387 dprintk("RPC: failed to contact local rpcbind "
Chuck Leverbabe80e2008-07-14 16:03:29 -0400388 "server (errno %d).\n", -error);
Chuck Lever14aeb212008-08-18 19:34:00 -0400389 return error;
390 }
Chuck Leverbabe80e2008-07-14 16:03:29 -0400391
Chuck Leverdb820d62008-09-25 11:57:05 -0400392 if (!result)
Chuck Lever14aeb212008-08-18 19:34:00 -0400393 return -EACCES;
Chuck Lever14aeb212008-08-18 19:34:00 -0400394 return 0;
Chuck Leverbabe80e2008-07-14 16:03:29 -0400395}
396
Chuck Levera5090502007-03-29 16:48:04 -0400397/**
398 * rpcb_register - set or unset a port registration with the local rpcbind svc
Randy Dunlapbda14602012-05-13 10:35:40 -0700399 * @net: target network namespace
Chuck Levera5090502007-03-29 16:48:04 -0400400 * @prog: RPC program number to bind
401 * @vers: RPC version number to bind
Chuck Leverc2e1b092008-07-14 16:03:30 -0400402 * @prot: transport protocol to register
Chuck Levera5090502007-03-29 16:48:04 -0400403 * @port: port value to register
Chuck Lever14aeb212008-08-18 19:34:00 -0400404 *
405 * Returns zero if the registration request was dispatched successfully
406 * and the rpcbind daemon returned success. Otherwise, returns an errno
407 * value that reflects the nature of the error (request could not be
408 * dispatched, timed out, or rpcbind returned an error).
Chuck Levera5090502007-03-29 16:48:04 -0400409 *
Chuck Leverc2e1b092008-07-14 16:03:30 -0400410 * RPC services invoke this function to advertise their contact
411 * information via the system's rpcbind daemon. RPC services
412 * invoke this function once for each [program, version, transport]
413 * tuple they wish to advertise.
Chuck Levera5090502007-03-29 16:48:04 -0400414 *
Chuck Leverc2e1b092008-07-14 16:03:30 -0400415 * Callers may also unregister RPC services that are no longer
416 * available by setting the passed-in port to zero. This removes
417 * all registered transports for [program, version] from the local
418 * rpcbind database.
419 *
Chuck Leverc2e1b092008-07-14 16:03:30 -0400420 * This function uses rpcbind protocol version 2 to contact the
421 * local rpcbind daemon.
422 *
423 * Registration works over both AF_INET and AF_INET6, and services
424 * registered via this function are advertised as available for any
425 * address. If the local rpcbind daemon is listening on AF_INET6,
426 * services registered via this function will be advertised on
427 * IN6ADDR_ANY (ie available for all AF_INET and AF_INET6
428 * addresses).
Chuck Levera5090502007-03-29 16:48:04 -0400429 */
Stanislav Kinsbursky977ac312012-01-13 12:52:43 +0400430int rpcb_register(struct net *net, u32 prog, u32 vers, int prot, unsigned short port)
Chuck Levera5090502007-03-29 16:48:04 -0400431{
Chuck Levera5090502007-03-29 16:48:04 -0400432 struct rpcbind_args map = {
433 .r_prog = prog,
434 .r_vers = vers,
435 .r_prot = prot,
436 .r_port = port,
437 };
438 struct rpc_message msg = {
Chuck Levera5090502007-03-29 16:48:04 -0400439 .rpc_argp = &map,
Chuck Levera5090502007-03-29 16:48:04 -0400440 };
Stanislav Kinsbursky977ac312012-01-13 12:52:43 +0400441 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
Chuck Levera5090502007-03-29 16:48:04 -0400442
443 dprintk("RPC: %sregistering (%u, %u, %d, %u) with local "
444 "rpcbind\n", (port ? "" : "un"),
445 prog, vers, prot, port);
446
Chuck Leverbabe80e2008-07-14 16:03:29 -0400447 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_UNSET];
448 if (port)
449 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_SET];
450
Stanislav Kinsburskydff02d42012-01-13 12:52:10 +0400451 return rpcb_register_call(sn->rpcb_local_clnt, &msg);
Chuck Levera5090502007-03-29 16:48:04 -0400452}
453
Chuck Leverc2e1b092008-07-14 16:03:30 -0400454/*
455 * Fill in AF_INET family-specific arguments to register
456 */
Stanislav Kinsbursky1a114a62012-01-13 12:52:26 +0400457static int rpcb_register_inet4(struct sunrpc_net *sn,
458 const struct sockaddr *sap,
Chuck Lever1673d0d2009-03-18 20:47:21 -0400459 struct rpc_message *msg)
Chuck Leverc2e1b092008-07-14 16:03:30 -0400460{
Chuck Lever3aba4552009-03-18 20:47:06 -0400461 const struct sockaddr_in *sin = (const struct sockaddr_in *)sap;
Chuck Leverc2e1b092008-07-14 16:03:30 -0400462 struct rpcbind_args *map = msg->rpc_argp;
Chuck Lever3aba4552009-03-18 20:47:06 -0400463 unsigned short port = ntohs(sin->sin_port);
Chuck Leverba809132009-08-09 15:09:35 -0400464 int result;
Chuck Leverc2e1b092008-07-14 16:03:30 -0400465
Trond Myklebustd77385f2011-10-17 16:08:10 -0700466 map->r_addr = rpc_sockaddr2uaddr(sap, GFP_KERNEL);
Chuck Leverc2e1b092008-07-14 16:03:30 -0400467
468 dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with "
469 "local rpcbind\n", (port ? "" : "un"),
470 map->r_prog, map->r_vers,
471 map->r_addr, map->r_netid);
472
473 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
474 if (port)
475 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
476
Stanislav Kinsburskydff02d42012-01-13 12:52:10 +0400477 result = rpcb_register_call(sn->rpcb_local_clnt4, msg);
Chuck Leverba809132009-08-09 15:09:35 -0400478 kfree(map->r_addr);
479 return result;
Chuck Leverc2e1b092008-07-14 16:03:30 -0400480}
481
482/*
483 * Fill in AF_INET6 family-specific arguments to register
484 */
Stanislav Kinsbursky1a114a62012-01-13 12:52:26 +0400485static int rpcb_register_inet6(struct sunrpc_net *sn,
486 const struct sockaddr *sap,
Chuck Lever1673d0d2009-03-18 20:47:21 -0400487 struct rpc_message *msg)
Chuck Leverc2e1b092008-07-14 16:03:30 -0400488{
Chuck Lever3aba4552009-03-18 20:47:06 -0400489 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sap;
Chuck Leverc2e1b092008-07-14 16:03:30 -0400490 struct rpcbind_args *map = msg->rpc_argp;
Chuck Lever3aba4552009-03-18 20:47:06 -0400491 unsigned short port = ntohs(sin6->sin6_port);
Chuck Leverba809132009-08-09 15:09:35 -0400492 int result;
Chuck Leverc2e1b092008-07-14 16:03:30 -0400493
Trond Myklebustd77385f2011-10-17 16:08:10 -0700494 map->r_addr = rpc_sockaddr2uaddr(sap, GFP_KERNEL);
Chuck Leverc2e1b092008-07-14 16:03:30 -0400495
496 dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with "
497 "local rpcbind\n", (port ? "" : "un"),
498 map->r_prog, map->r_vers,
499 map->r_addr, map->r_netid);
500
501 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
502 if (port)
503 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
504
Stanislav Kinsburskydff02d42012-01-13 12:52:10 +0400505 result = rpcb_register_call(sn->rpcb_local_clnt4, msg);
Chuck Leverba809132009-08-09 15:09:35 -0400506 kfree(map->r_addr);
507 return result;
Chuck Leverc2e1b092008-07-14 16:03:30 -0400508}
509
Stanislav Kinsbursky1a114a62012-01-13 12:52:26 +0400510static int rpcb_unregister_all_protofamilies(struct sunrpc_net *sn,
511 struct rpc_message *msg)
Chuck Lever1673d0d2009-03-18 20:47:21 -0400512{
513 struct rpcbind_args *map = msg->rpc_argp;
514
515 dprintk("RPC: unregistering [%u, %u, '%s'] with "
516 "local rpcbind\n",
517 map->r_prog, map->r_vers, map->r_netid);
518
519 map->r_addr = "";
520 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
521
Stanislav Kinsburskydff02d42012-01-13 12:52:10 +0400522 return rpcb_register_call(sn->rpcb_local_clnt4, msg);
Chuck Lever1673d0d2009-03-18 20:47:21 -0400523}
524
Chuck Leverc2e1b092008-07-14 16:03:30 -0400525/**
526 * rpcb_v4_register - set or unset a port registration with the local rpcbind
Randy Dunlapbda14602012-05-13 10:35:40 -0700527 * @net: target network namespace
Chuck Leverc2e1b092008-07-14 16:03:30 -0400528 * @program: RPC program number of service to (un)register
529 * @version: RPC version number of service to (un)register
530 * @address: address family, IP address, and port to (un)register
531 * @netid: netid of transport protocol to (un)register
Chuck Lever14aeb212008-08-18 19:34:00 -0400532 *
533 * Returns zero if the registration request was dispatched successfully
534 * and the rpcbind daemon returned success. Otherwise, returns an errno
535 * value that reflects the nature of the error (request could not be
536 * dispatched, timed out, or rpcbind returned an error).
Chuck Leverc2e1b092008-07-14 16:03:30 -0400537 *
538 * RPC services invoke this function to advertise their contact
539 * information via the system's rpcbind daemon. RPC services
540 * invoke this function once for each [program, version, address,
541 * netid] tuple they wish to advertise.
542 *
Chuck Lever1673d0d2009-03-18 20:47:21 -0400543 * Callers may also unregister RPC services that are registered at a
544 * specific address by setting the port number in @address to zero.
545 * They may unregister all registered protocol families at once for
546 * a service by passing a NULL @address argument. If @netid is ""
547 * then all netids for [program, version, address] are unregistered.
Chuck Leverc2e1b092008-07-14 16:03:30 -0400548 *
Chuck Leverc2e1b092008-07-14 16:03:30 -0400549 * This function uses rpcbind protocol version 4 to contact the
550 * local rpcbind daemon. The local rpcbind daemon must support
551 * version 4 of the rpcbind protocol in order for these functions
552 * to register a service successfully.
553 *
554 * Supported netids include "udp" and "tcp" for UDP and TCP over
555 * IPv4, and "udp6" and "tcp6" for UDP and TCP over IPv6,
556 * respectively.
557 *
558 * The contents of @address determine the address family and the
559 * port to be registered. The usual practice is to pass INADDR_ANY
560 * as the raw address, but specifying a non-zero address is also
561 * supported by this API if the caller wishes to advertise an RPC
562 * service on a specific network interface.
563 *
564 * Note that passing in INADDR_ANY does not create the same service
565 * registration as IN6ADDR_ANY. The former advertises an RPC
566 * service on any IPv4 address, but not on IPv6. The latter
567 * advertises the service on all IPv4 and IPv6 addresses.
568 */
Stanislav Kinsbursky977ac312012-01-13 12:52:43 +0400569int rpcb_v4_register(struct net *net, const u32 program, const u32 version,
Chuck Lever14aeb212008-08-18 19:34:00 -0400570 const struct sockaddr *address, const char *netid)
Chuck Leverc2e1b092008-07-14 16:03:30 -0400571{
572 struct rpcbind_args map = {
573 .r_prog = program,
574 .r_vers = version,
575 .r_netid = netid,
576 .r_owner = RPCB_OWNER_STRING,
577 };
578 struct rpc_message msg = {
579 .rpc_argp = &map,
Chuck Leverc2e1b092008-07-14 16:03:30 -0400580 };
Stanislav Kinsbursky977ac312012-01-13 12:52:43 +0400581 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
Chuck Leverc5266112009-12-03 15:58:56 -0500582
Stanislav Kinsburskydff02d42012-01-13 12:52:10 +0400583 if (sn->rpcb_local_clnt4 == NULL)
Chuck Leverc5266112009-12-03 15:58:56 -0500584 return -EPROTONOSUPPORT;
Chuck Leverc2e1b092008-07-14 16:03:30 -0400585
Chuck Lever1673d0d2009-03-18 20:47:21 -0400586 if (address == NULL)
Stanislav Kinsbursky1a114a62012-01-13 12:52:26 +0400587 return rpcb_unregister_all_protofamilies(sn, &msg);
Chuck Lever1673d0d2009-03-18 20:47:21 -0400588
Chuck Leverc2e1b092008-07-14 16:03:30 -0400589 switch (address->sa_family) {
590 case AF_INET:
Stanislav Kinsbursky1a114a62012-01-13 12:52:26 +0400591 return rpcb_register_inet4(sn, address, &msg);
Chuck Leverc2e1b092008-07-14 16:03:30 -0400592 case AF_INET6:
Stanislav Kinsbursky1a114a62012-01-13 12:52:26 +0400593 return rpcb_register_inet6(sn, address, &msg);
Chuck Leverc2e1b092008-07-14 16:03:30 -0400594 }
595
596 return -EAFNOSUPPORT;
597}
598
Trond Myklebust803a9062008-07-01 15:20:55 -0400599static 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 -0400600{
601 struct rpc_message msg = {
Trond Myklebust803a9062008-07-01 15:20:55 -0400602 .rpc_proc = proc,
Trond Myklebust5138fde2007-07-14 15:40:01 -0400603 .rpc_argp = map,
Chuck Leverc0c077d2009-08-09 15:09:43 -0400604 .rpc_resp = map,
Trond Myklebust5138fde2007-07-14 15:40:01 -0400605 };
606 struct rpc_task_setup task_setup_data = {
607 .rpc_client = rpcb_clnt,
608 .rpc_message = &msg,
609 .callback_ops = &rpcb_getport_ops,
610 .callback_data = map,
Chuck Lever012da152009-12-03 15:58:56 -0500611 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFTCONN,
Trond Myklebust5138fde2007-07-14 15:40:01 -0400612 };
613
614 return rpc_run_task(&task_setup_data);
615}
616
Trond Myklebust9a4bd292008-10-03 16:48:34 -0400617/*
618 * In the case where rpc clients have been cloned, we want to make
619 * sure that we use the program number/version etc of the actual
620 * owner of the xprt. To do so, we walk back up the tree of parents
621 * to find whoever created the transport and/or whoever has the
622 * autobind flag set.
623 */
624static struct rpc_clnt *rpcb_find_transport_owner(struct rpc_clnt *clnt)
625{
626 struct rpc_clnt *parent = clnt->cl_parent;
Trond Myklebust2446ab62012-03-01 17:00:56 -0500627 struct rpc_xprt *xprt = rcu_dereference(clnt->cl_xprt);
Trond Myklebust9a4bd292008-10-03 16:48:34 -0400628
629 while (parent != clnt) {
Trond Myklebust2446ab62012-03-01 17:00:56 -0500630 if (rcu_dereference(parent->cl_xprt) != xprt)
Trond Myklebust9a4bd292008-10-03 16:48:34 -0400631 break;
632 if (clnt->cl_autobind)
633 break;
634 clnt = parent;
635 parent = parent->cl_parent;
636 }
637 return clnt;
638}
639
Chuck Levera5090502007-03-29 16:48:04 -0400640/**
Chuck Lever45160d62007-07-01 12:13:17 -0400641 * rpcb_getport_async - obtain the port for a given RPC service on a given host
Chuck Levera5090502007-03-29 16:48:04 -0400642 * @task: task that is waiting for portmapper request
643 *
644 * This one can be called for an ongoing RPC request, and can be used in
645 * an async (rpciod) context.
646 */
Chuck Lever45160d62007-07-01 12:13:17 -0400647void rpcb_getport_async(struct rpc_task *task)
Chuck Levera5090502007-03-29 16:48:04 -0400648{
Trond Myklebust9a4bd292008-10-03 16:48:34 -0400649 struct rpc_clnt *clnt;
Trond Myklebust803a9062008-07-01 15:20:55 -0400650 struct rpc_procinfo *proc;
Chuck Lever0a48f5d2007-12-10 14:56:38 -0500651 u32 bind_version;
Trond Myklebust9a4bd292008-10-03 16:48:34 -0400652 struct rpc_xprt *xprt;
Chuck Levera5090502007-03-29 16:48:04 -0400653 struct rpc_clnt *rpcb_clnt;
Ben Greearec0dd262011-07-12 10:27:55 -0700654 struct rpcbind_args *map;
Chuck Levera5090502007-03-29 16:48:04 -0400655 struct rpc_task *child;
Chuck Lever9f6ad262007-12-10 14:56:31 -0500656 struct sockaddr_storage addr;
657 struct sockaddr *sap = (struct sockaddr *)&addr;
658 size_t salen;
Chuck Levera5090502007-03-29 16:48:04 -0400659 int status;
660
Trond Myklebust2446ab62012-03-01 17:00:56 -0500661 rcu_read_lock();
662 do {
663 clnt = rpcb_find_transport_owner(task->tk_client);
664 xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
665 } while (xprt == NULL);
666 rcu_read_unlock();
Trond Myklebust9a4bd292008-10-03 16:48:34 -0400667
Chuck Lever45160d62007-07-01 12:13:17 -0400668 dprintk("RPC: %5u %s(%s, %u, %u, %d)\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800669 task->tk_pid, __func__,
Trond Myklebust4e0038b2012-03-01 17:01:05 -0500670 xprt->servername, clnt->cl_prog, clnt->cl_vers, xprt->prot);
Chuck Levera5090502007-03-29 16:48:04 -0400671
Trond Myklebust381ba742008-07-07 12:18:53 -0400672 /* Put self on the wait queue to ensure we get notified if
673 * some other task is already attempting to bind the port */
674 rpc_sleep_on(&xprt->binding, task, NULL);
675
Chuck Levera5090502007-03-29 16:48:04 -0400676 if (xprt_test_and_set_binding(xprt)) {
Chuck Lever45160d62007-07-01 12:13:17 -0400677 dprintk("RPC: %5u %s: waiting for another binder\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800678 task->tk_pid, __func__);
Trond Myklebust2446ab62012-03-01 17:00:56 -0500679 xprt_put(xprt);
Trond Myklebust381ba742008-07-07 12:18:53 -0400680 return;
Chuck Levera5090502007-03-29 16:48:04 -0400681 }
682
Chuck Levera5090502007-03-29 16:48:04 -0400683 /* Someone else may have bound if we slept */
684 if (xprt_bound(xprt)) {
685 status = 0;
Chuck Lever45160d62007-07-01 12:13:17 -0400686 dprintk("RPC: %5u %s: already bound\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800687 task->tk_pid, __func__);
Chuck Levera5090502007-03-29 16:48:04 -0400688 goto bailout_nofree;
689 }
690
Chuck Leverba809132009-08-09 15:09:35 -0400691 /* Parent transport's destination address */
Chuck Lever9f6ad262007-12-10 14:56:31 -0500692 salen = rpc_peeraddr(clnt, sap, sizeof(addr));
Chuck Leverd5b64432007-08-06 11:57:18 -0400693
694 /* Don't ever use rpcbind v2 for AF_INET6 requests */
Chuck Lever9f6ad262007-12-10 14:56:31 -0500695 switch (sap->sa_family) {
Chuck Leverd5b64432007-08-06 11:57:18 -0400696 case AF_INET:
Trond Myklebust803a9062008-07-01 15:20:55 -0400697 proc = rpcb_next_version[xprt->bind_index].rpc_proc;
698 bind_version = rpcb_next_version[xprt->bind_index].rpc_vers;
Chuck Leverd5b64432007-08-06 11:57:18 -0400699 break;
700 case AF_INET6:
Trond Myklebust803a9062008-07-01 15:20:55 -0400701 proc = rpcb_next_version6[xprt->bind_index].rpc_proc;
702 bind_version = rpcb_next_version6[xprt->bind_index].rpc_vers;
Chuck Leverd5b64432007-08-06 11:57:18 -0400703 break;
704 default:
705 status = -EAFNOSUPPORT;
706 dprintk("RPC: %5u %s: bad address family\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800707 task->tk_pid, __func__);
Chuck Leverd5b64432007-08-06 11:57:18 -0400708 goto bailout_nofree;
709 }
Trond Myklebust803a9062008-07-01 15:20:55 -0400710 if (proc == NULL) {
Chuck Levera5090502007-03-29 16:48:04 -0400711 xprt->bind_index = 0;
Chuck Lever906462a2007-09-11 18:00:47 -0400712 status = -EPFNOSUPPORT;
Chuck Lever45160d62007-07-01 12:13:17 -0400713 dprintk("RPC: %5u %s: no more getport versions available\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800714 task->tk_pid, __func__);
Chuck Levera5090502007-03-29 16:48:04 -0400715 goto bailout_nofree;
716 }
Chuck Levera5090502007-03-29 16:48:04 -0400717
Chuck Lever45160d62007-07-01 12:13:17 -0400718 dprintk("RPC: %5u %s: trying rpcbind version %u\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800719 task->tk_pid, __func__, bind_version);
Chuck Levera5090502007-03-29 16:48:04 -0400720
Trond Myklebust4e0038b2012-03-01 17:01:05 -0500721 rpcb_clnt = rpcb_create(xprt->xprt_net, xprt->servername, sap, salen,
Stanislav Kinsburskyc2550e02012-01-13 12:52:35 +0400722 xprt->prot, bind_version);
Chuck Lever143b6c42007-08-16 16:03:31 -0400723 if (IS_ERR(rpcb_clnt)) {
724 status = PTR_ERR(rpcb_clnt);
725 dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800726 task->tk_pid, __func__, PTR_ERR(rpcb_clnt));
Chuck Lever143b6c42007-08-16 16:03:31 -0400727 goto bailout_nofree;
728 }
729
Chuck Levera5090502007-03-29 16:48:04 -0400730 map = kzalloc(sizeof(struct rpcbind_args), GFP_ATOMIC);
731 if (!map) {
732 status = -ENOMEM;
Chuck Lever45160d62007-07-01 12:13:17 -0400733 dprintk("RPC: %5u %s: no memory available\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800734 task->tk_pid, __func__);
Trond Myklebust96165e22008-10-03 16:48:40 -0400735 goto bailout_release_client;
Chuck Levera5090502007-03-29 16:48:04 -0400736 }
737 map->r_prog = clnt->cl_prog;
738 map->r_vers = clnt->cl_vers;
739 map->r_prot = xprt->prot;
740 map->r_port = 0;
Bryan Schumaker864cf9b2012-03-27 13:46:32 -0400741 map->r_xprt = xprt;
Trond Myklebust381ba742008-07-07 12:18:53 -0400742 map->r_status = -EIO;
Chuck Levera5090502007-03-29 16:48:04 -0400743
Chuck Leverba809132009-08-09 15:09:35 -0400744 switch (bind_version) {
745 case RPCBVERS_4:
746 case RPCBVERS_3:
Trond Myklebust2446ab62012-03-01 17:00:56 -0500747 map->r_netid = xprt->address_strings[RPC_DISPLAY_NETID];
Trond Myklebustd77385f2011-10-17 16:08:10 -0700748 map->r_addr = rpc_sockaddr2uaddr(sap, GFP_ATOMIC);
Chuck Leverba809132009-08-09 15:09:35 -0400749 map->r_owner = "";
750 break;
751 case RPCBVERS_2:
752 map->r_addr = NULL;
753 break;
754 default:
755 BUG();
756 }
757
Trond Myklebust803a9062008-07-01 15:20:55 -0400758 child = rpcb_call_async(rpcb_clnt, map, proc);
Trond Myklebust4c402b42007-06-14 16:40:32 -0400759 rpc_release_client(rpcb_clnt);
Chuck Levera5090502007-03-29 16:48:04 -0400760 if (IS_ERR(child)) {
Trond Myklebust0d3a34b2008-07-07 12:18:52 -0400761 /* rpcb_map_release() has freed the arguments */
Chuck Lever45160d62007-07-01 12:13:17 -0400762 dprintk("RPC: %5u %s: rpc_run_task failed\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800763 task->tk_pid, __func__);
Trond Myklebust381ba742008-07-07 12:18:53 -0400764 return;
Chuck Levera5090502007-03-29 16:48:04 -0400765 }
Chuck Levera5090502007-03-29 16:48:04 -0400766
Trond Myklebust9a4bd292008-10-03 16:48:34 -0400767 xprt->stat.bind_count++;
768 rpc_put_task(child);
Chuck Levera5090502007-03-29 16:48:04 -0400769 return;
770
Trond Myklebust96165e22008-10-03 16:48:40 -0400771bailout_release_client:
772 rpc_release_client(rpcb_clnt);
Chuck Levera5090502007-03-29 16:48:04 -0400773bailout_nofree:
774 rpcb_wake_rpcbind_waiters(xprt, status);
Chuck Levera5090502007-03-29 16:48:04 -0400775 task->tk_status = status;
Trond Myklebust2446ab62012-03-01 17:00:56 -0500776 xprt_put(xprt);
Chuck Levera5090502007-03-29 16:48:04 -0400777}
\"Talpey, Thomas\12444802007-09-10 13:45:36 -0400778EXPORT_SYMBOL_GPL(rpcb_getport_async);
Chuck Levera5090502007-03-29 16:48:04 -0400779
780/*
781 * Rpcbind child task calls this callback via tk_exit.
782 */
783static void rpcb_getport_done(struct rpc_task *child, void *data)
784{
785 struct rpcbind_args *map = data;
786 struct rpc_xprt *xprt = map->r_xprt;
787 int status = child->tk_status;
788
Chuck Lever4784cb52007-09-11 18:00:36 -0400789 /* Garbage reply: retry with a lesser rpcbind version */
790 if (status == -EIO)
791 status = -EPROTONOSUPPORT;
792
Chuck Levera5090502007-03-29 16:48:04 -0400793 /* rpcbind server doesn't support this rpcbind protocol version */
794 if (status == -EPROTONOSUPPORT)
795 xprt->bind_index++;
796
797 if (status < 0) {
798 /* rpcbind server not available on remote host? */
799 xprt->ops->set_port(xprt, 0);
800 } else if (map->r_port == 0) {
801 /* Requested RPC service wasn't registered on remote host */
802 xprt->ops->set_port(xprt, 0);
803 status = -EACCES;
804 } else {
805 /* Succeeded */
806 xprt->ops->set_port(xprt, map->r_port);
807 xprt_set_bound(xprt);
808 status = 0;
809 }
810
811 dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n",
812 child->tk_pid, status, map->r_port);
813
Trond Myklebust381ba742008-07-07 12:18:53 -0400814 map->r_status = status;
Chuck Levera5090502007-03-29 16:48:04 -0400815}
816
Chuck Lever166b88d2008-07-14 16:03:26 -0400817/*
818 * XDR functions for rpcbind
819 */
820
Chuck Lever9f06c712010-12-14 14:59:18 +0000821static void rpcb_enc_mapping(struct rpc_rqst *req, struct xdr_stream *xdr,
822 const struct rpcbind_args *rpcb)
Chuck Lever6f2c2db2009-08-09 15:09:40 -0400823{
Chuck Lever9f06c712010-12-14 14:59:18 +0000824 __be32 *p;
Chuck Lever6f2c2db2009-08-09 15:09:40 -0400825
826 dprintk("RPC: %5u encoding PMAP_%s call (%u, %u, %d, %u)\n",
Trond Myklebustffa94db2012-03-20 09:22:00 -0400827 req->rq_task->tk_pid,
828 req->rq_task->tk_msg.rpc_proc->p_name,
Chuck Lever6f2c2db2009-08-09 15:09:40 -0400829 rpcb->r_prog, rpcb->r_vers, rpcb->r_prot, rpcb->r_port);
830
Chuck Lever9f06c712010-12-14 14:59:18 +0000831 p = xdr_reserve_space(xdr, RPCB_mappingargs_sz << 2);
Chuck Lever4129ccf2010-12-14 14:58:59 +0000832 *p++ = cpu_to_be32(rpcb->r_prog);
833 *p++ = cpu_to_be32(rpcb->r_vers);
834 *p++ = cpu_to_be32(rpcb->r_prot);
835 *p = cpu_to_be32(rpcb->r_port);
Chuck Lever6f2c2db2009-08-09 15:09:40 -0400836}
837
Chuck Leverbf269552010-12-14 14:59:29 +0000838static int rpcb_dec_getport(struct rpc_rqst *req, struct xdr_stream *xdr,
Chuck Leverc0c077d2009-08-09 15:09:43 -0400839 struct rpcbind_args *rpcb)
840{
Chuck Leverc0c077d2009-08-09 15:09:43 -0400841 unsigned long port;
Chuck Leverbf269552010-12-14 14:59:29 +0000842 __be32 *p;
Chuck Leverc0c077d2009-08-09 15:09:43 -0400843
844 rpcb->r_port = 0;
845
Chuck Leverbf269552010-12-14 14:59:29 +0000846 p = xdr_inline_decode(xdr, 4);
Chuck Leverc0c077d2009-08-09 15:09:43 -0400847 if (unlikely(p == NULL))
848 return -EIO;
849
Chuck Lever4129ccf2010-12-14 14:58:59 +0000850 port = be32_to_cpup(p);
Trond Myklebustffa94db2012-03-20 09:22:00 -0400851 dprintk("RPC: %5u PMAP_%s result: %lu\n", req->rq_task->tk_pid,
852 req->rq_task->tk_msg.rpc_proc->p_name, port);
Alexey Dobriyan4be929b2010-05-24 14:33:03 -0700853 if (unlikely(port > USHRT_MAX))
Chuck Leverc0c077d2009-08-09 15:09:43 -0400854 return -EIO;
855
856 rpcb->r_port = port;
857 return 0;
858}
859
Chuck Leverbf269552010-12-14 14:59:29 +0000860static int rpcb_dec_set(struct rpc_rqst *req, struct xdr_stream *xdr,
Chuck Lever7ed0ff92009-08-09 15:09:42 -0400861 unsigned int *boolp)
862{
Chuck Leverbf269552010-12-14 14:59:29 +0000863 __be32 *p;
Chuck Lever7ed0ff92009-08-09 15:09:42 -0400864
Chuck Leverbf269552010-12-14 14:59:29 +0000865 p = xdr_inline_decode(xdr, 4);
Chuck Lever7ed0ff92009-08-09 15:09:42 -0400866 if (unlikely(p == NULL))
867 return -EIO;
868
869 *boolp = 0;
Chuck Leverbf269552010-12-14 14:59:29 +0000870 if (*p != xdr_zero)
Chuck Lever7ed0ff92009-08-09 15:09:42 -0400871 *boolp = 1;
872
873 dprintk("RPC: %5u RPCB_%s call %s\n",
Trond Myklebustffa94db2012-03-20 09:22:00 -0400874 req->rq_task->tk_pid,
875 req->rq_task->tk_msg.rpc_proc->p_name,
Chuck Lever7ed0ff92009-08-09 15:09:42 -0400876 (*boolp ? "succeeded" : "failed"));
877 return 0;
878}
879
Chuck Lever4129ccf2010-12-14 14:58:59 +0000880static void encode_rpcb_string(struct xdr_stream *xdr, const char *string,
881 const u32 maxstrlen)
Chuck Lever6f2c2db2009-08-09 15:09:40 -0400882{
Chuck Lever6f2c2db2009-08-09 15:09:40 -0400883 __be32 *p;
Chuck Lever4129ccf2010-12-14 14:58:59 +0000884 u32 len;
Chuck Lever6f2c2db2009-08-09 15:09:40 -0400885
Chuck Lever6f2c2db2009-08-09 15:09:40 -0400886 len = strlen(string);
Chuck Lever4129ccf2010-12-14 14:58:59 +0000887 BUG_ON(len > maxstrlen);
888 p = xdr_reserve_space(xdr, 4 + len);
Chuck Lever6f2c2db2009-08-09 15:09:40 -0400889 xdr_encode_opaque(p, string, len);
Chuck Lever6f2c2db2009-08-09 15:09:40 -0400890}
891
Chuck Lever9f06c712010-12-14 14:59:18 +0000892static void rpcb_enc_getaddr(struct rpc_rqst *req, struct xdr_stream *xdr,
893 const struct rpcbind_args *rpcb)
Chuck Lever6f2c2db2009-08-09 15:09:40 -0400894{
Chuck Lever9f06c712010-12-14 14:59:18 +0000895 __be32 *p;
Chuck Lever6f2c2db2009-08-09 15:09:40 -0400896
897 dprintk("RPC: %5u encoding RPCB_%s call (%u, %u, '%s', '%s')\n",
Trond Myklebustffa94db2012-03-20 09:22:00 -0400898 req->rq_task->tk_pid,
899 req->rq_task->tk_msg.rpc_proc->p_name,
Chuck Lever6f2c2db2009-08-09 15:09:40 -0400900 rpcb->r_prog, rpcb->r_vers,
901 rpcb->r_netid, rpcb->r_addr);
902
Chuck Lever9f06c712010-12-14 14:59:18 +0000903 p = xdr_reserve_space(xdr, (RPCB_program_sz + RPCB_version_sz) << 2);
Chuck Lever4129ccf2010-12-14 14:58:59 +0000904 *p++ = cpu_to_be32(rpcb->r_prog);
905 *p = cpu_to_be32(rpcb->r_vers);
Chuck Lever6f2c2db2009-08-09 15:09:40 -0400906
Chuck Lever9f06c712010-12-14 14:59:18 +0000907 encode_rpcb_string(xdr, rpcb->r_netid, RPCBIND_MAXNETIDLEN);
908 encode_rpcb_string(xdr, rpcb->r_addr, RPCBIND_MAXUADDRLEN);
909 encode_rpcb_string(xdr, rpcb->r_owner, RPCB_MAXOWNERLEN);
Chuck Lever6f2c2db2009-08-09 15:09:40 -0400910}
911
Chuck Leverbf269552010-12-14 14:59:29 +0000912static int rpcb_dec_getaddr(struct rpc_rqst *req, struct xdr_stream *xdr,
Chuck Leverc0c077d2009-08-09 15:09:43 -0400913 struct rpcbind_args *rpcb)
914{
915 struct sockaddr_storage address;
916 struct sockaddr *sap = (struct sockaddr *)&address;
Chuck Leverbf269552010-12-14 14:59:29 +0000917 __be32 *p;
Chuck Leverc0c077d2009-08-09 15:09:43 -0400918 u32 len;
919
920 rpcb->r_port = 0;
921
Chuck Leverbf269552010-12-14 14:59:29 +0000922 p = xdr_inline_decode(xdr, 4);
Chuck Leverc0c077d2009-08-09 15:09:43 -0400923 if (unlikely(p == NULL))
924 goto out_fail;
Chuck Lever4129ccf2010-12-14 14:58:59 +0000925 len = be32_to_cpup(p);
Chuck Leverc0c077d2009-08-09 15:09:43 -0400926
927 /*
928 * If the returned universal address is a null string,
929 * the requested RPC service was not registered.
930 */
931 if (len == 0) {
932 dprintk("RPC: %5u RPCB reply: program not registered\n",
Trond Myklebustffa94db2012-03-20 09:22:00 -0400933 req->rq_task->tk_pid);
Chuck Leverc0c077d2009-08-09 15:09:43 -0400934 return 0;
935 }
936
937 if (unlikely(len > RPCBIND_MAXUADDRLEN))
938 goto out_fail;
939
Chuck Leverbf269552010-12-14 14:59:29 +0000940 p = xdr_inline_decode(xdr, len);
Chuck Leverc0c077d2009-08-09 15:09:43 -0400941 if (unlikely(p == NULL))
942 goto out_fail;
Trond Myklebustffa94db2012-03-20 09:22:00 -0400943 dprintk("RPC: %5u RPCB_%s reply: %s\n", req->rq_task->tk_pid,
944 req->rq_task->tk_msg.rpc_proc->p_name, (char *)p);
Chuck Leverc0c077d2009-08-09 15:09:43 -0400945
Stanislav Kinsburskyb030fb02012-01-13 14:02:40 +0400946 if (rpc_uaddr2sockaddr(req->rq_xprt->xprt_net, (char *)p, len,
947 sap, sizeof(address)) == 0)
Chuck Leverc0c077d2009-08-09 15:09:43 -0400948 goto out_fail;
949 rpcb->r_port = rpc_get_port(sap);
950
951 return 0;
952
953out_fail:
954 dprintk("RPC: %5u malformed RPCB_%s reply\n",
Trond Myklebustffa94db2012-03-20 09:22:00 -0400955 req->rq_task->tk_pid,
956 req->rq_task->tk_msg.rpc_proc->p_name);
Chuck Leverc0c077d2009-08-09 15:09:43 -0400957 return -EIO;
958}
959
Chuck Levera5090502007-03-29 16:48:04 -0400960/*
961 * Not all rpcbind procedures described in RFC 1833 are implemented
962 * since the Linux kernel RPC code requires only these.
963 */
Chuck Leverf8b761e2009-08-09 15:09:44 -0400964
Chuck Levera5090502007-03-29 16:48:04 -0400965static struct rpc_procinfo rpcb_procedures2[] = {
Chuck Leverf8b761e2009-08-09 15:09:44 -0400966 [RPCBPROC_SET] = {
967 .p_proc = RPCBPROC_SET,
Chuck Lever9f06c712010-12-14 14:59:18 +0000968 .p_encode = (kxdreproc_t)rpcb_enc_mapping,
Chuck Leverbf269552010-12-14 14:59:29 +0000969 .p_decode = (kxdrdproc_t)rpcb_dec_set,
Chuck Leverf8b761e2009-08-09 15:09:44 -0400970 .p_arglen = RPCB_mappingargs_sz,
971 .p_replen = RPCB_setres_sz,
972 .p_statidx = RPCBPROC_SET,
973 .p_timer = 0,
974 .p_name = "SET",
975 },
976 [RPCBPROC_UNSET] = {
977 .p_proc = RPCBPROC_UNSET,
Chuck Lever9f06c712010-12-14 14:59:18 +0000978 .p_encode = (kxdreproc_t)rpcb_enc_mapping,
Chuck Leverbf269552010-12-14 14:59:29 +0000979 .p_decode = (kxdrdproc_t)rpcb_dec_set,
Chuck Leverf8b761e2009-08-09 15:09:44 -0400980 .p_arglen = RPCB_mappingargs_sz,
981 .p_replen = RPCB_setres_sz,
982 .p_statidx = RPCBPROC_UNSET,
983 .p_timer = 0,
984 .p_name = "UNSET",
985 },
986 [RPCBPROC_GETPORT] = {
987 .p_proc = RPCBPROC_GETPORT,
Chuck Lever9f06c712010-12-14 14:59:18 +0000988 .p_encode = (kxdreproc_t)rpcb_enc_mapping,
Chuck Leverbf269552010-12-14 14:59:29 +0000989 .p_decode = (kxdrdproc_t)rpcb_dec_getport,
Chuck Leverf8b761e2009-08-09 15:09:44 -0400990 .p_arglen = RPCB_mappingargs_sz,
991 .p_replen = RPCB_getportres_sz,
992 .p_statidx = RPCBPROC_GETPORT,
993 .p_timer = 0,
994 .p_name = "GETPORT",
995 },
Chuck Levera5090502007-03-29 16:48:04 -0400996};
997
998static struct rpc_procinfo rpcb_procedures3[] = {
Chuck Leverf8b761e2009-08-09 15:09:44 -0400999 [RPCBPROC_SET] = {
1000 .p_proc = RPCBPROC_SET,
Chuck Lever9f06c712010-12-14 14:59:18 +00001001 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
Chuck Leverbf269552010-12-14 14:59:29 +00001002 .p_decode = (kxdrdproc_t)rpcb_dec_set,
Chuck Leverf8b761e2009-08-09 15:09:44 -04001003 .p_arglen = RPCB_getaddrargs_sz,
1004 .p_replen = RPCB_setres_sz,
1005 .p_statidx = RPCBPROC_SET,
1006 .p_timer = 0,
1007 .p_name = "SET",
1008 },
1009 [RPCBPROC_UNSET] = {
1010 .p_proc = RPCBPROC_UNSET,
Chuck Lever9f06c712010-12-14 14:59:18 +00001011 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
Chuck Leverbf269552010-12-14 14:59:29 +00001012 .p_decode = (kxdrdproc_t)rpcb_dec_set,
Chuck Leverf8b761e2009-08-09 15:09:44 -04001013 .p_arglen = RPCB_getaddrargs_sz,
1014 .p_replen = RPCB_setres_sz,
1015 .p_statidx = RPCBPROC_UNSET,
1016 .p_timer = 0,
1017 .p_name = "UNSET",
1018 },
1019 [RPCBPROC_GETADDR] = {
1020 .p_proc = RPCBPROC_GETADDR,
Chuck Lever9f06c712010-12-14 14:59:18 +00001021 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
Chuck Leverbf269552010-12-14 14:59:29 +00001022 .p_decode = (kxdrdproc_t)rpcb_dec_getaddr,
Chuck Leverf8b761e2009-08-09 15:09:44 -04001023 .p_arglen = RPCB_getaddrargs_sz,
1024 .p_replen = RPCB_getaddrres_sz,
1025 .p_statidx = RPCBPROC_GETADDR,
1026 .p_timer = 0,
1027 .p_name = "GETADDR",
1028 },
Chuck Levera5090502007-03-29 16:48:04 -04001029};
1030
1031static struct rpc_procinfo rpcb_procedures4[] = {
Chuck Leverf8b761e2009-08-09 15:09:44 -04001032 [RPCBPROC_SET] = {
1033 .p_proc = RPCBPROC_SET,
Chuck Lever9f06c712010-12-14 14:59:18 +00001034 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
Chuck Leverbf269552010-12-14 14:59:29 +00001035 .p_decode = (kxdrdproc_t)rpcb_dec_set,
Chuck Leverf8b761e2009-08-09 15:09:44 -04001036 .p_arglen = RPCB_getaddrargs_sz,
1037 .p_replen = RPCB_setres_sz,
1038 .p_statidx = RPCBPROC_SET,
1039 .p_timer = 0,
1040 .p_name = "SET",
1041 },
1042 [RPCBPROC_UNSET] = {
1043 .p_proc = RPCBPROC_UNSET,
Chuck Lever9f06c712010-12-14 14:59:18 +00001044 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
Chuck Leverbf269552010-12-14 14:59:29 +00001045 .p_decode = (kxdrdproc_t)rpcb_dec_set,
Chuck Leverf8b761e2009-08-09 15:09:44 -04001046 .p_arglen = RPCB_getaddrargs_sz,
1047 .p_replen = RPCB_setres_sz,
1048 .p_statidx = RPCBPROC_UNSET,
1049 .p_timer = 0,
1050 .p_name = "UNSET",
1051 },
1052 [RPCBPROC_GETADDR] = {
1053 .p_proc = RPCBPROC_GETADDR,
Chuck Lever9f06c712010-12-14 14:59:18 +00001054 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
Chuck Leverbf269552010-12-14 14:59:29 +00001055 .p_decode = (kxdrdproc_t)rpcb_dec_getaddr,
Chuck Leverf8b761e2009-08-09 15:09:44 -04001056 .p_arglen = RPCB_getaddrargs_sz,
1057 .p_replen = RPCB_getaddrres_sz,
1058 .p_statidx = RPCBPROC_GETADDR,
1059 .p_timer = 0,
1060 .p_name = "GETADDR",
1061 },
Chuck Levera5090502007-03-29 16:48:04 -04001062};
1063
Trond Myklebusta613fa12012-01-20 13:53:56 -05001064static const struct rpcb_info rpcb_next_version[] = {
Chuck Leverfc200e72008-06-25 17:24:31 -04001065 {
1066 .rpc_vers = RPCBVERS_2,
1067 .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT],
1068 },
1069 {
1070 .rpc_proc = NULL,
1071 },
Chuck Levera5090502007-03-29 16:48:04 -04001072};
1073
Trond Myklebusta613fa12012-01-20 13:53:56 -05001074static const struct rpcb_info rpcb_next_version6[] = {
Chuck Leverfc200e72008-06-25 17:24:31 -04001075 {
1076 .rpc_vers = RPCBVERS_4,
Chuck Lever88424132008-06-25 17:24:47 -04001077 .rpc_proc = &rpcb_procedures4[RPCBPROC_GETADDR],
Chuck Leverfc200e72008-06-25 17:24:31 -04001078 },
1079 {
1080 .rpc_vers = RPCBVERS_3,
1081 .rpc_proc = &rpcb_procedures3[RPCBPROC_GETADDR],
1082 },
Chuck Leverfc200e72008-06-25 17:24:31 -04001083 {
1084 .rpc_proc = NULL,
1085 },
Chuck Leverd5b64432007-08-06 11:57:18 -04001086};
1087
Trond Myklebusta613fa12012-01-20 13:53:56 -05001088static const struct rpc_version rpcb_version2 = {
Chuck Leverfc200e72008-06-25 17:24:31 -04001089 .number = RPCBVERS_2,
Chuck Lever1ac7c232010-12-14 14:59:09 +00001090 .nrprocs = ARRAY_SIZE(rpcb_procedures2),
Chuck Levera5090502007-03-29 16:48:04 -04001091 .procs = rpcb_procedures2
1092};
1093
Trond Myklebusta613fa12012-01-20 13:53:56 -05001094static const struct rpc_version rpcb_version3 = {
Chuck Leverfc200e72008-06-25 17:24:31 -04001095 .number = RPCBVERS_3,
Chuck Lever1ac7c232010-12-14 14:59:09 +00001096 .nrprocs = ARRAY_SIZE(rpcb_procedures3),
Chuck Levera5090502007-03-29 16:48:04 -04001097 .procs = rpcb_procedures3
1098};
1099
Trond Myklebusta613fa12012-01-20 13:53:56 -05001100static const struct rpc_version rpcb_version4 = {
Chuck Leverfc200e72008-06-25 17:24:31 -04001101 .number = RPCBVERS_4,
Chuck Lever1ac7c232010-12-14 14:59:09 +00001102 .nrprocs = ARRAY_SIZE(rpcb_procedures4),
Chuck Levera5090502007-03-29 16:48:04 -04001103 .procs = rpcb_procedures4
1104};
1105
Trond Myklebusta613fa12012-01-20 13:53:56 -05001106static const struct rpc_version *rpcb_version[] = {
Chuck Levera5090502007-03-29 16:48:04 -04001107 NULL,
1108 NULL,
1109 &rpcb_version2,
1110 &rpcb_version3,
1111 &rpcb_version4
1112};
1113
1114static struct rpc_stat rpcb_stats;
1115
Trond Myklebusta613fa12012-01-20 13:53:56 -05001116static const struct rpc_program rpcb_program = {
Chuck Levera5090502007-03-29 16:48:04 -04001117 .name = "rpcbind",
1118 .number = RPCBIND_PROGRAM,
1119 .nrvers = ARRAY_SIZE(rpcb_version),
1120 .version = rpcb_version,
1121 .stats = &rpcb_stats,
1122};