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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/net/sunrpc/pmap.c
3 *
4 * Portmapper client.
5 *
6 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
7 */
8
9#include <linux/config.h>
10#include <linux/types.h>
11#include <linux/socket.h>
12#include <linux/kernel.h>
13#include <linux/errno.h>
14#include <linux/uio.h>
15#include <linux/in.h>
16#include <linux/sunrpc/clnt.h>
17#include <linux/sunrpc/xprt.h>
18#include <linux/sunrpc/sched.h>
19
20#ifdef RPC_DEBUG
21# define RPCDBG_FACILITY RPCDBG_PMAP
22#endif
23
24#define PMAP_SET 1
25#define PMAP_UNSET 2
26#define PMAP_GETPORT 3
27
28static struct rpc_procinfo pmap_procedures[];
Chuck Lever6cd75252005-09-22 21:24:59 -040029static struct rpc_clnt * pmap_create(char *, struct sockaddr_in *, int, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -070030static void pmap_getport_done(struct rpc_task *);
31static struct rpc_program pmap_program;
32static DEFINE_SPINLOCK(pmap_lock);
33
34/*
35 * Obtain the port for a given RPC service on a given host. This one can
36 * be called for an ongoing RPC request.
37 */
38void
39rpc_getport(struct rpc_task *task, struct rpc_clnt *clnt)
40{
41 struct rpc_portmap *map = clnt->cl_pmap;
42 struct sockaddr_in *sap = &clnt->cl_xprt->addr;
43 struct rpc_message msg = {
44 .rpc_proc = &pmap_procedures[PMAP_GETPORT],
45 .rpc_argp = map,
46 .rpc_resp = &clnt->cl_port,
47 .rpc_cred = NULL
48 };
49 struct rpc_clnt *pmap_clnt;
50 struct rpc_task *child;
51
52 dprintk("RPC: %4d rpc_getport(%s, %d, %d, %d)\n",
53 task->tk_pid, clnt->cl_server,
54 map->pm_prog, map->pm_vers, map->pm_prot);
55
Andreas Gruenbacher007e2512005-06-22 17:16:23 +000056 /* Autobind on cloned rpc clients is discouraged */
57 BUG_ON(clnt->cl_parent != clnt);
58
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 spin_lock(&pmap_lock);
60 if (map->pm_binding) {
61 rpc_sleep_on(&map->pm_bindwait, task, NULL, NULL);
62 spin_unlock(&pmap_lock);
63 return;
64 }
65 map->pm_binding = 1;
66 spin_unlock(&pmap_lock);
67
Chuck Lever6cd75252005-09-22 21:24:59 -040068 pmap_clnt = pmap_create(clnt->cl_server, sap, map->pm_prot, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 if (IS_ERR(pmap_clnt)) {
70 task->tk_status = PTR_ERR(pmap_clnt);
71 goto bailout;
72 }
73 task->tk_status = 0;
74
75 /*
76 * Note: rpc_new_child will release client after a failure.
77 */
78 if (!(child = rpc_new_child(pmap_clnt, task)))
79 goto bailout;
80
81 /* Setup the call info struct */
82 rpc_call_setup(child, &msg, 0);
83
84 /* ... and run the child task */
Chuck Lever262ca072006-03-20 13:44:16 -050085 task->tk_xprt->stat.bind_count++;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 rpc_run_child(task, child, pmap_getport_done);
87 return;
88
89bailout:
90 spin_lock(&pmap_lock);
91 map->pm_binding = 0;
92 rpc_wake_up(&map->pm_bindwait);
93 spin_unlock(&pmap_lock);
Trond Myklebustabbcf282006-01-03 09:55:03 +010094 rpc_exit(task, -EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095}
96
97#ifdef CONFIG_ROOT_NFS
98int
99rpc_getport_external(struct sockaddr_in *sin, __u32 prog, __u32 vers, int prot)
100{
101 struct rpc_portmap map = {
102 .pm_prog = prog,
103 .pm_vers = vers,
104 .pm_prot = prot,
105 .pm_port = 0
106 };
Chuck Leverdead28d2006-03-20 13:44:23 -0500107 struct rpc_message msg = {
108 .rpc_proc = &pmap_procedures[PMAP_GETPORT],
109 .rpc_argp = &map,
110 .rpc_resp = &map.pm_port,
111 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 struct rpc_clnt *pmap_clnt;
113 char hostname[32];
114 int status;
115
116 dprintk("RPC: rpc_getport_external(%u.%u.%u.%u, %d, %d, %d)\n",
117 NIPQUAD(sin->sin_addr.s_addr), prog, vers, prot);
118
119 sprintf(hostname, "%u.%u.%u.%u", NIPQUAD(sin->sin_addr.s_addr));
Chuck Lever6cd75252005-09-22 21:24:59 -0400120 pmap_clnt = pmap_create(hostname, sin, prot, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 if (IS_ERR(pmap_clnt))
122 return PTR_ERR(pmap_clnt);
123
124 /* Setup the call info struct */
Chuck Leverdead28d2006-03-20 13:44:23 -0500125 status = rpc_call_sync(pmap_clnt, &msg, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126
127 if (status >= 0) {
128 if (map.pm_port != 0)
129 return map.pm_port;
130 status = -EACCES;
131 }
132 return status;
133}
134#endif
135
136static void
137pmap_getport_done(struct rpc_task *task)
138{
139 struct rpc_clnt *clnt = task->tk_client;
Chuck Lever92200412006-01-03 09:55:51 +0100140 struct rpc_xprt *xprt = task->tk_xprt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 struct rpc_portmap *map = clnt->cl_pmap;
142
143 dprintk("RPC: %4d pmap_getport_done(status %d, port %d)\n",
144 task->tk_pid, task->tk_status, clnt->cl_port);
Chuck Lever92200412006-01-03 09:55:51 +0100145
146 xprt->ops->set_port(xprt, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 if (task->tk_status < 0) {
148 /* Make the calling task exit with an error */
Trond Myklebustabbcf282006-01-03 09:55:03 +0100149 task->tk_action = rpc_exit_task;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 } else if (clnt->cl_port == 0) {
151 /* Program not registered */
Trond Myklebustabbcf282006-01-03 09:55:03 +0100152 rpc_exit(task, -EACCES);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 } else {
Chuck Lever92200412006-01-03 09:55:51 +0100154 xprt->ops->set_port(xprt, clnt->cl_port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 clnt->cl_port = htons(clnt->cl_port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 }
157 spin_lock(&pmap_lock);
158 map->pm_binding = 0;
159 rpc_wake_up(&map->pm_bindwait);
160 spin_unlock(&pmap_lock);
161}
162
163/*
164 * Set or unset a port registration with the local portmapper.
165 * port == 0 means unregister, port != 0 means register.
166 */
167int
168rpc_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay)
169{
Chuck Leverdead28d2006-03-20 13:44:23 -0500170 struct sockaddr_in sin = {
171 .sin_family = AF_INET,
172 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
173 };
174 struct rpc_portmap map = {
175 .pm_prog = prog,
176 .pm_vers = vers,
177 .pm_prot = prot,
178 .pm_port = port,
179 };
180 struct rpc_message msg = {
181 .rpc_proc = &pmap_procedures[port ? PMAP_SET : PMAP_UNSET],
182 .rpc_argp = &map,
183 .rpc_resp = okay,
184 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 struct rpc_clnt *pmap_clnt;
186 int error = 0;
187
188 dprintk("RPC: registering (%d, %d, %d, %d) with portmapper.\n",
189 prog, vers, prot, port);
190
Chuck Lever6cd75252005-09-22 21:24:59 -0400191 pmap_clnt = pmap_create("localhost", &sin, IPPROTO_UDP, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 if (IS_ERR(pmap_clnt)) {
193 error = PTR_ERR(pmap_clnt);
194 dprintk("RPC: couldn't create pmap client. Error = %d\n", error);
195 return error;
196 }
197
Chuck Leverdead28d2006-03-20 13:44:23 -0500198 error = rpc_call_sync(pmap_clnt, &msg, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199
200 if (error < 0) {
201 printk(KERN_WARNING
202 "RPC: failed to contact portmap (errno %d).\n",
203 error);
204 }
205 dprintk("RPC: registration status %d/%d\n", error, *okay);
206
207 /* Client deleted automatically because cl_oneshot == 1 */
208 return error;
209}
210
211static struct rpc_clnt *
Chuck Lever6cd75252005-09-22 21:24:59 -0400212pmap_create(char *hostname, struct sockaddr_in *srvaddr, int proto, int privileged)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213{
214 struct rpc_xprt *xprt;
215 struct rpc_clnt *clnt;
216
217 /* printk("pmap: create xprt\n"); */
218 xprt = xprt_create_proto(proto, srvaddr, NULL);
219 if (IS_ERR(xprt))
220 return (struct rpc_clnt *)xprt;
Chuck Lever92200412006-01-03 09:55:51 +0100221 xprt->ops->set_port(xprt, RPC_PMAP_PORT);
Chuck Lever6cd75252005-09-22 21:24:59 -0400222 if (!privileged)
223 xprt->resvport = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224
225 /* printk("pmap: create clnt\n"); */
Trond Myklebust5ee0ed72005-06-22 17:16:20 +0000226 clnt = rpc_new_client(xprt, hostname,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 &pmap_program, RPC_PMAP_VERSION,
228 RPC_AUTH_UNIX);
Trond Myklebust5b616f52005-06-22 17:16:20 +0000229 if (!IS_ERR(clnt)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 clnt->cl_softrtry = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 clnt->cl_oneshot = 1;
232 }
233 return clnt;
234}
235
236/*
237 * XDR encode/decode functions for PMAP
238 */
239static int
240xdr_encode_mapping(struct rpc_rqst *req, u32 *p, struct rpc_portmap *map)
241{
242 dprintk("RPC: xdr_encode_mapping(%d, %d, %d, %d)\n",
243 map->pm_prog, map->pm_vers, map->pm_prot, map->pm_port);
244 *p++ = htonl(map->pm_prog);
245 *p++ = htonl(map->pm_vers);
246 *p++ = htonl(map->pm_prot);
247 *p++ = htonl(map->pm_port);
248
249 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
250 return 0;
251}
252
253static int
254xdr_decode_port(struct rpc_rqst *req, u32 *p, unsigned short *portp)
255{
256 *portp = (unsigned short) ntohl(*p++);
257 return 0;
258}
259
260static int
261xdr_decode_bool(struct rpc_rqst *req, u32 *p, unsigned int *boolp)
262{
263 *boolp = (unsigned int) ntohl(*p++);
264 return 0;
265}
266
267static struct rpc_procinfo pmap_procedures[] = {
268[PMAP_SET] = {
269 .p_proc = PMAP_SET,
270 .p_encode = (kxdrproc_t) xdr_encode_mapping,
271 .p_decode = (kxdrproc_t) xdr_decode_bool,
272 .p_bufsiz = 4,
273 .p_count = 1,
Chuck Levercc0175c2006-03-20 13:44:22 -0500274 .p_statidx = PMAP_SET,
275 .p_name = "SET",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 },
277[PMAP_UNSET] = {
278 .p_proc = PMAP_UNSET,
279 .p_encode = (kxdrproc_t) xdr_encode_mapping,
280 .p_decode = (kxdrproc_t) xdr_decode_bool,
281 .p_bufsiz = 4,
282 .p_count = 1,
Chuck Levercc0175c2006-03-20 13:44:22 -0500283 .p_statidx = PMAP_UNSET,
284 .p_name = "UNSET",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 },
286[PMAP_GETPORT] = {
287 .p_proc = PMAP_GETPORT,
288 .p_encode = (kxdrproc_t) xdr_encode_mapping,
289 .p_decode = (kxdrproc_t) xdr_decode_port,
290 .p_bufsiz = 4,
291 .p_count = 1,
Chuck Levercc0175c2006-03-20 13:44:22 -0500292 .p_statidx = PMAP_GETPORT,
293 .p_name = "GETPORT",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 },
295};
296
297static struct rpc_version pmap_version2 = {
298 .number = 2,
299 .nrprocs = 4,
300 .procs = pmap_procedures
301};
302
303static struct rpc_version * pmap_version[] = {
304 NULL,
305 NULL,
306 &pmap_version2
307};
308
309static struct rpc_stat pmap_stats;
310
311static struct rpc_program pmap_program = {
312 .name = "portmap",
313 .number = RPC_PMAP_PROGRAM,
314 .nrvers = ARRAY_SIZE(pmap_version),
315 .version = pmap_version,
316 .stats = &pmap_stats,
317};