X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=net%2Fsunrpc%2Fpmap_clnt.c;h=e52afab413ded56212cad69a2801df58bc6b6d6c;hb=b7651030a56b9aa80e9cb43b4c8bb28b89c42359;hp=d25b054ec921cd1e11d0497bf152fcaf7d105b96;hpb=55d8ca4f8094246da6e71889a4e04bfafaa78b10;p=linux-2.6-omap-h63xx.git diff --git a/net/sunrpc/pmap_clnt.c b/net/sunrpc/pmap_clnt.c index d25b054ec92..e52afab413d 100644 --- a/net/sunrpc/pmap_clnt.c +++ b/net/sunrpc/pmap_clnt.c @@ -1,12 +1,13 @@ /* - * linux/net/sunrpc/pmap.c + * linux/net/sunrpc/pmap_clnt.c * - * Portmapper client. + * In-kernel RPC portmapper client. + * + * Portmapper supports version 2 of the rpcbind protocol (RFC 1833). * * Copyright (C) 1996, Olaf Kirch */ -#include #include #include #include @@ -14,7 +15,6 @@ #include #include #include -#include #include #ifdef RPC_DEBUG @@ -25,80 +25,141 @@ #define PMAP_UNSET 2 #define PMAP_GETPORT 3 +struct portmap_args { + u32 pm_prog; + u32 pm_vers; + u32 pm_prot; + unsigned short pm_port; + struct rpc_xprt * pm_xprt; +}; + 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 void pmap_getport_done(struct rpc_task *, void *); 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) +static void pmap_getport_prepare(struct rpc_task *task, void *calldata) { - struct rpc_portmap *map = clnt->cl_pmap; - struct sockaddr_in *sap = &clnt->cl_xprt->addr; + struct portmap_args *map = calldata; struct rpc_message msg = { .rpc_proc = &pmap_procedures[PMAP_GETPORT], .rpc_argp = map, - .rpc_resp = &clnt->cl_port, - .rpc_cred = NULL + .rpc_resp = &map->pm_port, }; + + rpc_call_setup(task, &msg, 0); +} + +static inline struct portmap_args *pmap_map_alloc(void) +{ + return kmalloc(sizeof(struct portmap_args), GFP_NOFS); +} + +static inline void pmap_map_free(struct portmap_args *map) +{ + kfree(map); +} + +static void pmap_map_release(void *data) +{ + pmap_map_free(data); +} + +static const struct rpc_call_ops pmap_getport_ops = { + .rpc_call_prepare = pmap_getport_prepare, + .rpc_call_done = pmap_getport_done, + .rpc_release = pmap_map_release, +}; + +static inline void pmap_wake_portmap_waiters(struct rpc_xprt *xprt, int status) +{ + xprt_clear_binding(xprt); + rpc_wake_up_status(&xprt->binding, status); +} + +/** + * rpc_getport - obtain the port for a given RPC service on a given host + * @task: task that is waiting for portmapper request + * + * This one can be called for an ongoing RPC request, and can be used in + * an async (rpciod) context. + */ +void rpc_getport(struct rpc_task *task) +{ + struct rpc_clnt *clnt = task->tk_client; + struct rpc_xprt *xprt = task->tk_xprt; + struct sockaddr_in addr; + struct portmap_args *map; struct rpc_clnt *pmap_clnt; - struct rpc_task *child; + struct rpc_task *child; + int status; - dprintk("RPC: %4d rpc_getport(%s, %d, %d, %d)\n", + dprintk("RPC: %4d rpc_getport(%s, %u, %u, %d)\n", task->tk_pid, clnt->cl_server, - map->pm_prog, map->pm_vers, map->pm_prot); + clnt->cl_prog, clnt->cl_vers, xprt->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); + /* Put self on queue before sending rpcbind request, in case + * pmap_getport_done completes before we return from rpc_run_task */ + rpc_sleep_on(&xprt->binding, task, NULL, NULL); + + status = -EACCES; /* tell caller to check again */ + if (xprt_test_and_set_binding(xprt)) + goto bailout_nofree; + + /* Someone else may have bound if we slept */ + status = 0; + if (xprt_bound(xprt)) + goto bailout_nofree; + + status = -ENOMEM; + map = pmap_map_alloc(); + if (!map) + goto bailout_nofree; + map->pm_prog = clnt->cl_prog; + map->pm_vers = clnt->cl_vers; + map->pm_prot = xprt->prot; + map->pm_port = 0; + map->pm_xprt = xprt_get(xprt); + + rpc_peeraddr(clnt, (struct sockaddr *) &addr, sizeof(addr)); + pmap_clnt = pmap_create(clnt->cl_server, &addr, map->pm_prot, 0); + status = PTR_ERR(pmap_clnt); + if (IS_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))) + status = -EIO; + child = rpc_run_task(pmap_clnt, RPC_TASK_ASYNC, &pmap_getport_ops, map); + if (IS_ERR(child)) goto bailout; + rpc_release_task(child); - /* Setup the call info struct */ - rpc_call_setup(child, &msg, 0); - - /* ... and run the child task */ task->tk_xprt->stat.bind_count++; - 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); - rpc_exit(task, -EIO); + pmap_map_free(map); + xprt_put(xprt); +bailout_nofree: + task->tk_status = status; + pmap_wake_portmap_waiters(xprt, status); } #ifdef CONFIG_ROOT_NFS -int -rpc_getport_external(struct sockaddr_in *sin, __u32 prog, __u32 vers, int prot) +/** + * rpc_getport_external - obtain the port for a given RPC service on a given host + * @sin: address of remote peer + * @prog: RPC program number to bind + * @vers: RPC version number to bind + * @prot: transport protocol to use to make this request + * + * This one is called from outside the RPC client in a synchronous task context. + */ +int rpc_getport_external(struct sockaddr_in *sin, __u32 prog, __u32 vers, int prot) { - struct rpc_portmap map = { + struct portmap_args map = { .pm_prog = prog, .pm_vers = vers, .pm_prot = prot, @@ -113,7 +174,7 @@ rpc_getport_external(struct sockaddr_in *sin, __u32 prog, __u32 vers, int prot) char hostname[32]; int status; - dprintk("RPC: rpc_getport_external(%u.%u.%u.%u, %d, %d, %d)\n", + dprintk("RPC: rpc_getport_external(%u.%u.%u.%u, %u, %u, %d)\n", NIPQUAD(sin->sin_addr.s_addr), prog, vers, prot); sprintf(hostname, "%u.%u.%u.%u", NIPQUAD(sin->sin_addr.s_addr)); @@ -133,45 +194,53 @@ rpc_getport_external(struct sockaddr_in *sin, __u32 prog, __u32 vers, int prot) } #endif -static void -pmap_getport_done(struct rpc_task *task) +/* + * Portmapper child task invokes this callback via tk_exit. + */ +static void pmap_getport_done(struct rpc_task *child, void *data) { - struct rpc_clnt *clnt = task->tk_client; - struct rpc_xprt *xprt = task->tk_xprt; - 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); - - xprt->ops->set_port(xprt, 0); - if (task->tk_status < 0) { - /* Make the calling task exit with an error */ - task->tk_action = rpc_exit_task; - } else if (clnt->cl_port == 0) { - /* Program not registered */ - rpc_exit(task, -EACCES); + struct portmap_args *map = data; + struct rpc_xprt *xprt = map->pm_xprt; + int status = child->tk_status; + + if (status < 0) { + /* Portmapper not available */ + xprt->ops->set_port(xprt, 0); + } else if (map->pm_port == 0) { + /* Requested RPC service wasn't registered */ + xprt->ops->set_port(xprt, 0); + status = -EACCES; } else { - xprt->ops->set_port(xprt, clnt->cl_port); - clnt->cl_port = htons(clnt->cl_port); + /* Succeeded */ + xprt->ops->set_port(xprt, map->pm_port); + xprt_set_bound(xprt); + status = 0; } - spin_lock(&pmap_lock); - map->pm_binding = 0; - rpc_wake_up(&map->pm_bindwait); - spin_unlock(&pmap_lock); + + dprintk("RPC: %4d pmap_getport_done(status %d, port %u)\n", + child->tk_pid, status, map->pm_port); + + pmap_wake_portmap_waiters(xprt, status); + xprt_put(xprt); } -/* - * Set or unset a port registration with the local portmapper. +/** + * rpc_register - set or unset a port registration with the local portmapper + * @prog: RPC program number to bind + * @vers: RPC version number to bind + * @prot: transport protocol to use to make this request + * @port: port value to register + * @okay: result code + * * port == 0 means unregister, port != 0 means register. */ -int -rpc_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay) +int rpc_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay) { struct sockaddr_in sin = { .sin_family = AF_INET, .sin_addr.s_addr = htonl(INADDR_LOOPBACK), }; - struct rpc_portmap map = { + struct portmap_args map = { .pm_prog = prog, .pm_vers = vers, .pm_prot = prot, @@ -185,7 +254,7 @@ rpc_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay) struct rpc_clnt *pmap_clnt; int error = 0; - dprintk("RPC: registering (%d, %d, %d, %d) with portmapper.\n", + dprintk("RPC: registering (%u, %u, %d, %u) with portmapper.\n", prog, vers, prot, port); pmap_clnt = pmap_create("localhost", &sin, IPPROTO_UDP, 1); @@ -208,38 +277,32 @@ rpc_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay) return error; } -static struct rpc_clnt * -pmap_create(char *hostname, struct sockaddr_in *srvaddr, int proto, int privileged) +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->ops->set_port(xprt, RPC_PMAP_PORT); + struct rpc_create_args args = { + .protocol = proto, + .address = (struct sockaddr *)srvaddr, + .addrsize = sizeof(*srvaddr), + .servername = hostname, + .program = &pmap_program, + .version = RPC_PMAP_VERSION, + .authflavor = RPC_AUTH_UNIX, + .flags = (RPC_CLNT_CREATE_ONESHOT | + RPC_CLNT_CREATE_NOPING), + }; + + srvaddr->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_oneshot = 1; - } - return clnt; + args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; + return rpc_create(&args); } /* * XDR encode/decode functions for PMAP */ -static int -xdr_encode_mapping(struct rpc_rqst *req, u32 *p, struct rpc_portmap *map) +static int xdr_encode_mapping(struct rpc_rqst *req, __be32 *p, struct portmap_args *map) { - dprintk("RPC: xdr_encode_mapping(%d, %d, %d, %d)\n", + dprintk("RPC: xdr_encode_mapping(%u, %u, %u, %u)\n", map->pm_prog, map->pm_vers, map->pm_prot, map->pm_port); *p++ = htonl(map->pm_prog); *p++ = htonl(map->pm_vers); @@ -250,15 +313,13 @@ xdr_encode_mapping(struct rpc_rqst *req, u32 *p, struct rpc_portmap *map) return 0; } -static int -xdr_decode_port(struct rpc_rqst *req, u32 *p, unsigned short *portp) +static int xdr_decode_port(struct rpc_rqst *req, __be32 *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) +static int xdr_decode_bool(struct rpc_rqst *req, __be32 *p, unsigned int *boolp) { *boolp = (unsigned int) ntohl(*p++); return 0;