2 * linux/net/sunrpc/pmap.c
6 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
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>
16 #include <linux/sunrpc/clnt.h>
17 #include <linux/sunrpc/xprt.h>
18 #include <linux/sunrpc/sched.h>
21 # define RPCDBG_FACILITY RPCDBG_PMAP
26 #define PMAP_GETPORT 3
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);
35 * Obtain the port for a given RPC service on a given host. This one can
36 * be called for an ongoing RPC request.
39 rpc_getport(struct rpc_task *task, struct rpc_clnt *clnt)
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],
46 .rpc_resp = &clnt->cl_port,
49 struct rpc_clnt *pmap_clnt;
50 struct rpc_task *child;
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);
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);
63 spin_unlock(&pmap_lock);
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);
73 * Note: rpc_new_child will release client after a failure.
75 if (!(child = rpc_new_child(pmap_clnt, task)))
78 /* Setup the call info struct */
79 rpc_call_setup(child, &msg, 0);
81 /* ... and run the child task */
82 rpc_run_child(task, child, pmap_getport_done);
86 spin_lock(&pmap_lock);
88 rpc_wake_up(&map->pm_bindwait);
89 spin_unlock(&pmap_lock);
90 task->tk_status = -EIO;
91 task->tk_action = NULL;
94 #ifdef CONFIG_ROOT_NFS
96 rpc_getport_external(struct sockaddr_in *sin, __u32 prog, __u32 vers, int prot)
98 struct rpc_portmap map = {
104 struct rpc_clnt *pmap_clnt;
108 dprintk("RPC: rpc_getport_external(%u.%u.%u.%u, %d, %d, %d)\n",
109 NIPQUAD(sin->sin_addr.s_addr), prog, vers, prot);
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);
116 /* Setup the call info struct */
117 status = rpc_call(pmap_clnt, PMAP_GETPORT, &map, &map.pm_port, 0);
120 if (map.pm_port != 0)
129 pmap_getport_done(struct rpc_task *task)
131 struct rpc_clnt *clnt = task->tk_client;
132 struct rpc_portmap *map = clnt->cl_pmap;
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;
144 /* byte-swap port number first */
145 clnt->cl_port = htons(clnt->cl_port);
146 clnt->cl_xprt->addr.sin_port = clnt->cl_port;
148 spin_lock(&pmap_lock);
150 rpc_wake_up(&map->pm_bindwait);
151 spin_unlock(&pmap_lock);
155 * Set or unset a port registration with the local portmapper.
156 * port == 0 means unregister, port != 0 means register.
159 rpc_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay)
161 struct sockaddr_in sin;
162 struct rpc_portmap map;
163 struct rpc_clnt *pmap_clnt;
166 dprintk("RPC: registering (%d, %d, %d, %d) with portmapper.\n",
167 prog, vers, prot, port);
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);
183 error = rpc_call(pmap_clnt, port? PMAP_SET : PMAP_UNSET,
188 "RPC: failed to contact portmap (errno %d).\n",
191 dprintk("RPC: registration status %d/%d\n", error, *okay);
193 /* Client deleted automatically because cl_oneshot == 1 */
197 static struct rpc_clnt *
198 pmap_create(char *hostname, struct sockaddr_in *srvaddr, int proto)
200 struct rpc_xprt *xprt;
201 struct rpc_clnt *clnt;
203 /* printk("pmap: create xprt\n"); */
204 xprt = xprt_create_proto(proto, srvaddr, NULL);
206 return (struct rpc_clnt *)xprt;
207 xprt->addr.sin_port = htons(RPC_PMAP_PORT);
209 /* printk("pmap: create clnt\n"); */
210 clnt = rpc_create_client(xprt, hostname,
211 &pmap_program, RPC_PMAP_VERSION,
214 clnt->cl_softrtry = 1;
216 clnt->cl_oneshot = 1;
222 * XDR encode/decode functions for PMAP
225 xdr_encode_mapping(struct rpc_rqst *req, u32 *p, struct rpc_portmap *map)
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);
234 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
239 xdr_decode_port(struct rpc_rqst *req, u32 *p, unsigned short *portp)
241 *portp = (unsigned short) ntohl(*p++);
246 xdr_decode_bool(struct rpc_rqst *req, u32 *p, unsigned int *boolp)
248 *boolp = (unsigned int) ntohl(*p++);
252 static struct rpc_procinfo pmap_procedures[] = {
255 .p_encode = (kxdrproc_t) xdr_encode_mapping,
256 .p_decode = (kxdrproc_t) xdr_decode_bool,
261 .p_proc = PMAP_UNSET,
262 .p_encode = (kxdrproc_t) xdr_encode_mapping,
263 .p_decode = (kxdrproc_t) xdr_decode_bool,
268 .p_proc = PMAP_GETPORT,
269 .p_encode = (kxdrproc_t) xdr_encode_mapping,
270 .p_decode = (kxdrproc_t) xdr_decode_port,
276 static struct rpc_version pmap_version2 = {
279 .procs = pmap_procedures
282 static struct rpc_version * pmap_version[] = {
288 static struct rpc_stat pmap_stats;
290 static struct rpc_program pmap_program = {
292 .number = RPC_PMAP_PROGRAM,
293 .nrvers = ARRAY_SIZE(pmap_version),
294 .version = pmap_version,
295 .stats = &pmap_stats,