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Diffstat (limited to 'net/sunrpc/pmap_clnt.c')
-rw-r--r--net/sunrpc/pmap_clnt.c298
1 files changed, 298 insertions, 0 deletions
diff --git a/net/sunrpc/pmap_clnt.c b/net/sunrpc/pmap_clnt.c
new file mode 100644
index 00000000000..d0b1d2c34a4
--- /dev/null
+++ b/net/sunrpc/pmap_clnt.c
@@ -0,0 +1,298 @@
+/*
+ * 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);
+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);
+
+ 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);
+ 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);
+ 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);
+ 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)
+{
+ 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);
+
+ /* printk("pmap: create clnt\n"); */
+ clnt = rpc_create_client(xprt, hostname,
+ &pmap_program, RPC_PMAP_VERSION,
+ RPC_AUTH_UNIX);
+ if (IS_ERR(clnt)) {
+ xprt_destroy(xprt);
+ } else {
+ 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,
+};