[PATCH] RPC: Make rpc_create_client() destroy the transport on failure.
[linux-2.6.git] / net / sunrpc / pmap_clnt.c
1 /*
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
28 static struct rpc_procinfo      pmap_procedures[];
29 static struct rpc_clnt *        pmap_create(char *, struct sockaddr_in *, int);
30 static void                     pmap_getport_done(struct rpc_task *);
31 static struct rpc_program       pmap_program;
32 static 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  */
38 void
39 rpc_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
56         spin_lock(&pmap_lock);
57         if (map->pm_binding) {
58                 rpc_sleep_on(&map->pm_bindwait, task, NULL, NULL);
59                 spin_unlock(&pmap_lock);
60                 return;
61         }
62         map->pm_binding = 1;
63         spin_unlock(&pmap_lock);
64
65         pmap_clnt = pmap_create(clnt->cl_server, sap, map->pm_prot);
66         if (IS_ERR(pmap_clnt)) {
67                 task->tk_status = PTR_ERR(pmap_clnt);
68                 goto bailout;
69         }
70         task->tk_status = 0;
71
72         /*
73          * Note: rpc_new_child will release client after a failure.
74          */
75         if (!(child = rpc_new_child(pmap_clnt, task)))
76                 goto bailout;
77
78         /* Setup the call info struct */
79         rpc_call_setup(child, &msg, 0);
80
81         /* ... and run the child task */
82         rpc_run_child(task, child, pmap_getport_done);
83         return;
84
85 bailout:
86         spin_lock(&pmap_lock);
87         map->pm_binding = 0;
88         rpc_wake_up(&map->pm_bindwait);
89         spin_unlock(&pmap_lock);
90         task->tk_status = -EIO;
91         task->tk_action = NULL;
92 }
93
94 #ifdef CONFIG_ROOT_NFS
95 int
96 rpc_getport_external(struct sockaddr_in *sin, __u32 prog, __u32 vers, int prot)
97 {
98         struct rpc_portmap map = {
99                 .pm_prog        = prog,
100                 .pm_vers        = vers,
101                 .pm_prot        = prot,
102                 .pm_port        = 0
103         };
104         struct rpc_clnt *pmap_clnt;
105         char            hostname[32];
106         int             status;
107
108         dprintk("RPC:      rpc_getport_external(%u.%u.%u.%u, %d, %d, %d)\n",
109                         NIPQUAD(sin->sin_addr.s_addr), prog, vers, prot);
110
111         sprintf(hostname, "%u.%u.%u.%u", NIPQUAD(sin->sin_addr.s_addr));
112         pmap_clnt = pmap_create(hostname, sin, prot);
113         if (IS_ERR(pmap_clnt))
114                 return PTR_ERR(pmap_clnt);
115
116         /* Setup the call info struct */
117         status = rpc_call(pmap_clnt, PMAP_GETPORT, &map, &map.pm_port, 0);
118
119         if (status >= 0) {
120                 if (map.pm_port != 0)
121                         return map.pm_port;
122                 status = -EACCES;
123         }
124         return status;
125 }
126 #endif
127
128 static void
129 pmap_getport_done(struct rpc_task *task)
130 {
131         struct rpc_clnt *clnt = task->tk_client;
132         struct rpc_portmap *map = clnt->cl_pmap;
133
134         dprintk("RPC: %4d pmap_getport_done(status %d, port %d)\n",
135                         task->tk_pid, task->tk_status, clnt->cl_port);
136         if (task->tk_status < 0) {
137                 /* Make the calling task exit with an error */
138                 task->tk_action = NULL;
139         } else if (clnt->cl_port == 0) {
140                 /* Program not registered */
141                 task->tk_status = -EACCES;
142                 task->tk_action = NULL;
143         } else {
144                 /* byte-swap port number first */
145                 clnt->cl_port = htons(clnt->cl_port);
146                 clnt->cl_xprt->addr.sin_port = clnt->cl_port;
147         }
148         spin_lock(&pmap_lock);
149         map->pm_binding = 0;
150         rpc_wake_up(&map->pm_bindwait);
151         spin_unlock(&pmap_lock);
152 }
153
154 /*
155  * Set or unset a port registration with the local portmapper.
156  * port == 0 means unregister, port != 0 means register.
157  */
158 int
159 rpc_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay)
160 {
161         struct sockaddr_in      sin;
162         struct rpc_portmap      map;
163         struct rpc_clnt         *pmap_clnt;
164         int error = 0;
165
166         dprintk("RPC: registering (%d, %d, %d, %d) with portmapper.\n",
167                         prog, vers, prot, port);
168
169         sin.sin_family = AF_INET;
170         sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
171         pmap_clnt = pmap_create("localhost", &sin, IPPROTO_UDP);
172         if (IS_ERR(pmap_clnt)) {
173                 error = PTR_ERR(pmap_clnt);
174                 dprintk("RPC: couldn't create pmap client. Error = %d\n", error);
175                 return error;
176         }
177
178         map.pm_prog = prog;
179         map.pm_vers = vers;
180         map.pm_prot = prot;
181         map.pm_port = port;
182
183         error = rpc_call(pmap_clnt, port? PMAP_SET : PMAP_UNSET,
184                                         &map, okay, 0);
185
186         if (error < 0) {
187                 printk(KERN_WARNING
188                         "RPC: failed to contact portmap (errno %d).\n",
189                         error);
190         }
191         dprintk("RPC: registration status %d/%d\n", error, *okay);
192
193         /* Client deleted automatically because cl_oneshot == 1 */
194         return error;
195 }
196
197 static struct rpc_clnt *
198 pmap_create(char *hostname, struct sockaddr_in *srvaddr, int proto)
199 {
200         struct rpc_xprt *xprt;
201         struct rpc_clnt *clnt;
202
203         /* printk("pmap: create xprt\n"); */
204         xprt = xprt_create_proto(proto, srvaddr, NULL);
205         if (IS_ERR(xprt))
206                 return (struct rpc_clnt *)xprt;
207         xprt->addr.sin_port = htons(RPC_PMAP_PORT);
208
209         /* printk("pmap: create clnt\n"); */
210         clnt = rpc_create_client(xprt, hostname,
211                                 &pmap_program, RPC_PMAP_VERSION,
212                                 RPC_AUTH_UNIX);
213         if (!IS_ERR(clnt)) {
214                 clnt->cl_softrtry = 1;
215                 clnt->cl_chatty   = 1;
216                 clnt->cl_oneshot  = 1;
217         }
218         return clnt;
219 }
220
221 /*
222  * XDR encode/decode functions for PMAP
223  */
224 static int
225 xdr_encode_mapping(struct rpc_rqst *req, u32 *p, struct rpc_portmap *map)
226 {
227         dprintk("RPC: xdr_encode_mapping(%d, %d, %d, %d)\n",
228                 map->pm_prog, map->pm_vers, map->pm_prot, map->pm_port);
229         *p++ = htonl(map->pm_prog);
230         *p++ = htonl(map->pm_vers);
231         *p++ = htonl(map->pm_prot);
232         *p++ = htonl(map->pm_port);
233
234         req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
235         return 0;
236 }
237
238 static int
239 xdr_decode_port(struct rpc_rqst *req, u32 *p, unsigned short *portp)
240 {
241         *portp = (unsigned short) ntohl(*p++);
242         return 0;
243 }
244
245 static int
246 xdr_decode_bool(struct rpc_rqst *req, u32 *p, unsigned int *boolp)
247 {
248         *boolp = (unsigned int) ntohl(*p++);
249         return 0;
250 }
251
252 static struct rpc_procinfo      pmap_procedures[] = {
253 [PMAP_SET] = {
254           .p_proc               = PMAP_SET,
255           .p_encode             = (kxdrproc_t) xdr_encode_mapping,      
256           .p_decode             = (kxdrproc_t) xdr_decode_bool,
257           .p_bufsiz             = 4,
258           .p_count              = 1,
259         },
260 [PMAP_UNSET] = {
261           .p_proc               = PMAP_UNSET,
262           .p_encode             = (kxdrproc_t) xdr_encode_mapping,      
263           .p_decode             = (kxdrproc_t) xdr_decode_bool,
264           .p_bufsiz             = 4,
265           .p_count              = 1,
266         },
267 [PMAP_GETPORT] = {
268           .p_proc               = PMAP_GETPORT,
269           .p_encode             = (kxdrproc_t) xdr_encode_mapping,
270           .p_decode             = (kxdrproc_t) xdr_decode_port,
271           .p_bufsiz             = 4,
272           .p_count              = 1,
273         },
274 };
275
276 static struct rpc_version       pmap_version2 = {
277         .number         = 2,
278         .nrprocs        = 4,
279         .procs          = pmap_procedures
280 };
281
282 static struct rpc_version *     pmap_version[] = {
283         NULL,
284         NULL,
285         &pmap_version2
286 };
287
288 static struct rpc_stat          pmap_stats;
289
290 static struct rpc_program       pmap_program = {
291         .name           = "portmap",
292         .number         = RPC_PMAP_PROGRAM,
293         .nrvers         = ARRAY_SIZE(pmap_version),
294         .version        = pmap_version,
295         .stats          = &pmap_stats,
296 };