aboutsummaryrefslogtreecommitdiffstats
path: root/net/sunrpc/pmap_clnt.c
blob: a398575f94b8a1dd1a9da067c597ccdd7bb24ce3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
/*
 * linux/net/sunrpc/pmap.c
 *
 * Portmapper client.
 *
 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
 */

#include <linux/config.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/uio.h>
#include <linux/in.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/xprt.h>
#include <linux/sunrpc/sched.h>

#ifdef RPC_DEBUG
# define RPCDBG_FACILITY	RPCDBG_PMAP
#endif

#define PMAP_SET		1
#define PMAP_UNSET		2
#define PMAP_GETPORT		3

static struct rpc_procinfo	pmap_procedures[];
static struct rpc_clnt *	pmap_create(char *, struct sockaddr_in *, int, int);
static void			pmap_getport_done(struct rpc_task *);
static struct rpc_program	pmap_program;
static DEFINE_SPINLOCK(pmap_lock);

/*
 * Obtain the port for a given RPC service on a given host. This one can
 * be called for an ongoing RPC request.
 */
void
rpc_getport(struct rpc_task *task, struct rpc_clnt *clnt)
{
	struct rpc_portmap *map = clnt->cl_pmap;
	struct sockaddr_in *sap = &clnt->cl_xprt->addr;
	struct rpc_message msg = {
		.rpc_proc	= &pmap_procedures[PMAP_GETPORT],
		.rpc_argp	= map,
		.rpc_resp	= &clnt->cl_port,
		.rpc_cred	= NULL
	};
	struct rpc_clnt	*pmap_clnt;
	struct rpc_task	*child;

	dprintk("RPC: %4d rpc_getport(%s, %d, %d, %d)\n",
			task->tk_pid, clnt->cl_server,
			map->pm_prog, map->pm_vers, map->pm_prot);

	/* Autobind on cloned rpc clients is discouraged */
	BUG_ON(clnt->cl_parent != clnt);

	spin_lock(&pmap_lock);
	if (map->pm_binding) {
		rpc_sleep_on(&map->pm_bindwait, task, NULL, NULL);
		spin_unlock(&pmap_lock);
		return;
	}
	map->pm_binding = 1;
	spin_unlock(&pmap_lock);

	pmap_clnt = pmap_create(clnt->cl_server, sap, map->pm_prot, 0);
	if (IS_ERR(pmap_clnt)) {
		task->tk_status = PTR_ERR(pmap_clnt);
		goto bailout;
	}
	task->tk_status = 0;

	/*
	 * Note: rpc_new_child will release client after a failure.
	 */
	if (!(child = rpc_new_child(pmap_clnt, task)))
		goto bailout;

	/* Setup the call info struct */
	rpc_call_setup(child, &msg, 0);

	/* ... and run the child task */
	rpc_run_child(task, child, pmap_getport_done);
	return;

bailout:
	spin_lock(&pmap_lock);
	map->pm_binding = 0;
	rpc_wake_up(&map->pm_bindwait);
	spin_unlock(&pmap_lock);
	task->tk_status = -EIO;
	task->tk_action = NULL;
}

#ifdef CONFIG_ROOT_NFS
int
rpc_getport_external(struct sockaddr_in *sin, __u32 prog, __u32 vers, int prot)
{
	struct rpc_portmap map = {
		.pm_prog	= prog,
		.pm_vers	= vers,
		.pm_prot	= prot,
		.pm_port	= 0
	};
	struct rpc_clnt	*pmap_clnt;
	char		hostname[32];
	int		status;

	dprintk("RPC:      rpc_getport_external(%u.%u.%u.%u, %d, %d, %d)\n",
			NIPQUAD(sin->sin_addr.s_addr), prog, vers, prot);

	sprintf(hostname, "%u.%u.%u.%u", NIPQUAD(sin->sin_addr.s_addr));
	pmap_clnt = pmap_create(hostname, sin, prot, 0);
	if (IS_ERR(pmap_clnt))
		return PTR_ERR(pmap_clnt);

	/* Setup the call info struct */
	status = rpc_call(pmap_clnt, PMAP_GETPORT, &map, &map.pm_port, 0);

	if (status >= 0) {
		if (map.pm_port != 0)
			return map.pm_port;
		status = -EACCES;
	}
	return status;
}
#endif

static void
pmap_getport_done(struct rpc_task *task)
{
	struct rpc_clnt	*clnt = task->tk_client;
	struct rpc_portmap *map = clnt->cl_pmap;

	dprintk("RPC: %4d pmap_getport_done(status %d, port %d)\n",
			task->tk_pid, task->tk_status, clnt->cl_port);
	if (task->tk_status < 0) {
		/* Make the calling task exit with an error */
		task->tk_action = NULL;
	} else if (clnt->cl_port == 0) {
		/* Program not registered */
		task->tk_status = -EACCES;
		task->tk_action = NULL;
	} else {
		/* byte-swap port number first */
		clnt->cl_port = htons(clnt->cl_port);
		clnt->cl_xprt->addr.sin_port = clnt->cl_port;
	}
	spin_lock(&pmap_lock);
	map->pm_binding = 0;
	rpc_wake_up(&map->pm_bindwait);
	spin_unlock(&pmap_lock);
}

/*
 * Set or unset a port registration with the local portmapper.
 * port == 0 means unregister, port != 0 means register.
 */
int
rpc_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay)
{
	struct sockaddr_in	sin;
	struct rpc_portmap	map;
	struct rpc_clnt		*pmap_clnt;
	int error = 0;

	dprintk("RPC: registering (%d, %d, %d, %d) with portmapper.\n",
			prog, vers, prot, port);

	sin.sin_family = AF_INET;
	sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
	pmap_clnt = pmap_create("localhost", &sin, IPPROTO_UDP, 1);
	if (IS_ERR(pmap_clnt)) {
		error = PTR_ERR(pmap_clnt);
		dprintk("RPC: couldn't create pmap client. Error = %d\n", error);
		return error;
	}

	map.pm_prog = prog;
	map.pm_vers = vers;
	map.pm_prot = prot;
	map.pm_port = port;

	error = rpc_call(pmap_clnt, port? PMAP_SET : PMAP_UNSET,
					&map, okay, 0);

	if (error < 0) {
		printk(KERN_WARNING
			"RPC: failed to contact portmap (errno %d).\n",
			error);
	}
	dprintk("RPC: registration status %d/%d\n", error, *okay);

	/* Client deleted automatically because cl_oneshot == 1 */
	return error;
}

static struct rpc_clnt *
pmap_create(char *hostname, struct sockaddr_in *srvaddr, int proto, int privileged)
{
	struct rpc_xprt	*xprt;
	struct rpc_clnt	*clnt;

	/* printk("pmap: create xprt\n"); */
	xprt = xprt_create_proto(proto, srvaddr, NULL);
	if (IS_ERR(xprt))
		return (struct rpc_clnt *)xprt;
	xprt->addr.sin_port = htons(RPC_PMAP_PORT);
	if (!privileged)
		xprt->resvport = 0;

	/* printk("pmap: create clnt\n"); */
	clnt = rpc_new_client(xprt, hostname,
				&pmap_program, RPC_PMAP_VERSION,
				RPC_AUTH_UNIX);
	if (!IS_ERR(clnt)) {
		clnt->cl_softrtry = 1;
		clnt->cl_chatty   = 1;
		clnt->cl_oneshot  = 1;
	}
	return clnt;
}

/*
 * XDR encode/decode functions for PMAP
 */
static int
xdr_encode_mapping(struct rpc_rqst *req, u32 *p, struct rpc_portmap *map)
{
	dprintk("RPC: xdr_encode_mapping(%d, %d, %d, %d)\n",
		map->pm_prog, map->pm_vers, map->pm_prot, map->pm_port);
	*p++ = htonl(map->pm_prog);
	*p++ = htonl(map->pm_vers);
	*p++ = htonl(map->pm_prot);
	*p++ = htonl(map->pm_port);

	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
	return 0;
}

static int
xdr_decode_port(struct rpc_rqst *req, u32 *p, unsigned short *portp)
{
	*portp = (unsigned short) ntohl(*p++);
	return 0;
}

static int
xdr_decode_bool(struct rpc_rqst *req, u32 *p, unsigned int *boolp)
{
	*boolp = (unsigned int) ntohl(*p++);
	return 0;
}

static struct rpc_procinfo	pmap_procedures[] = {
[PMAP_SET] = {
	  .p_proc		= PMAP_SET,
	  .p_encode		= (kxdrproc_t) xdr_encode_mapping,	
	  .p_decode		= (kxdrproc_t) xdr_decode_bool,
	  .p_bufsiz		= 4,
	  .p_count		= 1,
	},
[PMAP_UNSET] = {
	  .p_proc		= PMAP_UNSET,
	  .p_encode		= (kxdrproc_t) xdr_encode_mapping,	
	  .p_decode		= (kxdrproc_t) xdr_decode_bool,
	  .p_bufsiz		= 4,
	  .p_count		= 1,
	},
[PMAP_GETPORT] = {
	  .p_proc		= PMAP_GETPORT,
	  .p_encode		= (kxdrproc_t) xdr_encode_mapping,
	  .p_decode		= (kxdrproc_t) xdr_decode_port,
	  .p_bufsiz		= 4,
	  .p_count		= 1,
	},
};

static struct rpc_version	pmap_version2 = {
	.number		= 2,
	.nrprocs	= 4,
	.procs		= pmap_procedures
};

static struct rpc_version *	pmap_version[] = {
	NULL,
	NULL,
	&pmap_version2
};

static struct rpc_stat		pmap_stats;

static struct rpc_program	pmap_program = {
	.name		= "portmap",
	.number		= RPC_PMAP_PROGRAM,
	.nrvers		= ARRAY_SIZE(pmap_version),
	.version	= pmap_version,
	.stats		= &pmap_stats,
};