| /* |
| * 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); |
| |
| /* 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); |
| 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); |
| 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, |
| }; |