659 строки
16 KiB
C
659 строки
16 KiB
C
/*
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* In-kernel rpcbind client supporting versions 2, 3, and 4 of the rpcbind
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* protocol
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*
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* Based on RFC 1833: "Binding Protocols for ONC RPC Version 2" and
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* RFC 3530: "Network File System (NFS) version 4 Protocol"
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*
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* Original: Gilles Quillard, Bull Open Source, 2005 <gilles.quillard@bull.net>
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* Updated: Chuck Lever, Oracle Corporation, 2007 <chuck.lever@oracle.com>
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*
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* Descended from net/sunrpc/pmap_clnt.c,
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* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/in6.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/sunrpc/sched.h>
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#include <linux/sunrpc/xprtsock.h>
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#ifdef RPC_DEBUG
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# define RPCDBG_FACILITY RPCDBG_BIND
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#endif
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#define RPCBIND_PROGRAM (100000u)
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#define RPCBIND_PORT (111u)
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#define RPCBVERS_2 (2u)
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#define RPCBVERS_3 (3u)
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#define RPCBVERS_4 (4u)
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enum {
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RPCBPROC_NULL,
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RPCBPROC_SET,
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RPCBPROC_UNSET,
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RPCBPROC_GETPORT,
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RPCBPROC_GETADDR = 3, /* alias for GETPORT */
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RPCBPROC_DUMP,
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RPCBPROC_CALLIT,
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RPCBPROC_BCAST = 5, /* alias for CALLIT */
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RPCBPROC_GETTIME,
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RPCBPROC_UADDR2TADDR,
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RPCBPROC_TADDR2UADDR,
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RPCBPROC_GETVERSADDR,
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RPCBPROC_INDIRECT,
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RPCBPROC_GETADDRLIST,
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RPCBPROC_GETSTAT,
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};
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#define RPCB_HIGHPROC_2 RPCBPROC_CALLIT
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#define RPCB_HIGHPROC_3 RPCBPROC_TADDR2UADDR
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#define RPCB_HIGHPROC_4 RPCBPROC_GETSTAT
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/*
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* r_owner
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*
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* The "owner" is allowed to unset a service in the rpcbind database.
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* We always use the following (arbitrary) fixed string.
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*/
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#define RPCB_OWNER_STRING "rpcb"
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#define RPCB_MAXOWNERLEN sizeof(RPCB_OWNER_STRING)
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static void rpcb_getport_done(struct rpc_task *, void *);
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static void rpcb_map_release(void *data);
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static struct rpc_program rpcb_program;
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struct rpcbind_args {
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struct rpc_xprt * r_xprt;
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u32 r_prog;
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u32 r_vers;
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u32 r_prot;
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unsigned short r_port;
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const char * r_netid;
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const char * r_addr;
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const char * r_owner;
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int r_status;
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};
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static struct rpc_procinfo rpcb_procedures2[];
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static struct rpc_procinfo rpcb_procedures3[];
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struct rpcb_info {
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u32 rpc_vers;
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struct rpc_procinfo * rpc_proc;
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};
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static struct rpcb_info rpcb_next_version[];
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static struct rpcb_info rpcb_next_version6[];
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static const struct rpc_call_ops rpcb_getport_ops = {
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.rpc_call_done = rpcb_getport_done,
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.rpc_release = rpcb_map_release,
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};
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static void rpcb_wake_rpcbind_waiters(struct rpc_xprt *xprt, int status)
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{
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xprt_clear_binding(xprt);
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rpc_wake_up_status(&xprt->binding, status);
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}
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static void rpcb_map_release(void *data)
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{
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struct rpcbind_args *map = data;
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rpcb_wake_rpcbind_waiters(map->r_xprt, map->r_status);
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xprt_put(map->r_xprt);
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kfree(map);
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}
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static struct rpc_clnt *rpcb_create(char *hostname, struct sockaddr *srvaddr,
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size_t salen, int proto, u32 version,
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int privileged)
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{
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struct rpc_create_args args = {
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.protocol = proto,
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.address = srvaddr,
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.addrsize = salen,
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.servername = hostname,
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.program = &rpcb_program,
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.version = version,
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.authflavor = RPC_AUTH_UNIX,
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.flags = RPC_CLNT_CREATE_NOPING,
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};
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switch (srvaddr->sa_family) {
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case AF_INET:
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((struct sockaddr_in *)srvaddr)->sin_port = htons(RPCBIND_PORT);
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break;
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case AF_INET6:
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((struct sockaddr_in6 *)srvaddr)->sin6_port = htons(RPCBIND_PORT);
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break;
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default:
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return NULL;
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}
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if (!privileged)
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args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
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return rpc_create(&args);
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}
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/**
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* rpcb_register - set or unset a port registration with the local rpcbind svc
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* @prog: RPC program number to bind
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* @vers: RPC version number to bind
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* @prot: transport protocol to use to make this request
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* @port: port value to register
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* @okay: result code
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*
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* port == 0 means unregister, port != 0 means register.
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*
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* This routine supports only rpcbind version 2.
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*/
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int rpcb_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay)
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{
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struct sockaddr_in sin = {
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.sin_family = AF_INET,
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.sin_addr.s_addr = htonl(INADDR_LOOPBACK),
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};
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struct rpcbind_args map = {
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.r_prog = prog,
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.r_vers = vers,
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.r_prot = prot,
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.r_port = port,
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};
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struct rpc_message msg = {
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.rpc_proc = &rpcb_procedures2[port ?
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RPCBPROC_SET : RPCBPROC_UNSET],
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.rpc_argp = &map,
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.rpc_resp = okay,
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};
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struct rpc_clnt *rpcb_clnt;
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int error = 0;
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dprintk("RPC: %sregistering (%u, %u, %d, %u) with local "
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"rpcbind\n", (port ? "" : "un"),
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prog, vers, prot, port);
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rpcb_clnt = rpcb_create("localhost", (struct sockaddr *) &sin,
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sizeof(sin), XPRT_TRANSPORT_UDP, RPCBVERS_2, 1);
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if (IS_ERR(rpcb_clnt))
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return PTR_ERR(rpcb_clnt);
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error = rpc_call_sync(rpcb_clnt, &msg, 0);
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rpc_shutdown_client(rpcb_clnt);
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if (error < 0)
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printk(KERN_WARNING "RPC: failed to contact local rpcbind "
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"server (errno %d).\n", -error);
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dprintk("RPC: registration status %d/%d\n", error, *okay);
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return error;
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}
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/**
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* rpcb_getport_sync - obtain the port for an RPC service on a given host
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* @sin: address of remote peer
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* @prog: RPC program number to bind
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* @vers: RPC version number to bind
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* @prot: transport protocol to use to make this request
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*
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* Return value is the requested advertised port number,
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* or a negative errno value.
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*
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* Called from outside the RPC client in a synchronous task context.
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* Uses default timeout parameters specified by underlying transport.
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*
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* XXX: Needs to support IPv6
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*/
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int rpcb_getport_sync(struct sockaddr_in *sin, u32 prog, u32 vers, int prot)
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{
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struct rpcbind_args map = {
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.r_prog = prog,
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.r_vers = vers,
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.r_prot = prot,
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.r_port = 0,
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};
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struct rpc_message msg = {
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.rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT],
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.rpc_argp = &map,
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.rpc_resp = &map.r_port,
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};
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struct rpc_clnt *rpcb_clnt;
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int status;
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dprintk("RPC: %s(" NIPQUAD_FMT ", %u, %u, %d)\n",
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__func__, NIPQUAD(sin->sin_addr.s_addr), prog, vers, prot);
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rpcb_clnt = rpcb_create(NULL, (struct sockaddr *)sin,
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sizeof(*sin), prot, RPCBVERS_2, 0);
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if (IS_ERR(rpcb_clnt))
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return PTR_ERR(rpcb_clnt);
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status = rpc_call_sync(rpcb_clnt, &msg, 0);
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rpc_shutdown_client(rpcb_clnt);
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if (status >= 0) {
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if (map.r_port != 0)
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return map.r_port;
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status = -EACCES;
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}
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return status;
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}
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EXPORT_SYMBOL_GPL(rpcb_getport_sync);
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static struct rpc_task *rpcb_call_async(struct rpc_clnt *rpcb_clnt, struct rpcbind_args *map, struct rpc_procinfo *proc)
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{
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struct rpc_message msg = {
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.rpc_proc = proc,
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.rpc_argp = map,
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.rpc_resp = &map->r_port,
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};
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struct rpc_task_setup task_setup_data = {
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.rpc_client = rpcb_clnt,
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.rpc_message = &msg,
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.callback_ops = &rpcb_getport_ops,
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.callback_data = map,
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.flags = RPC_TASK_ASYNC,
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};
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return rpc_run_task(&task_setup_data);
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}
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/**
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* rpcb_getport_async - obtain the port for a given RPC service on a given host
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* @task: task that is waiting for portmapper request
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*
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* This one can be called for an ongoing RPC request, and can be used in
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* an async (rpciod) context.
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*/
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void rpcb_getport_async(struct rpc_task *task)
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{
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struct rpc_clnt *clnt = task->tk_client;
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struct rpc_procinfo *proc;
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u32 bind_version;
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struct rpc_xprt *xprt = task->tk_xprt;
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struct rpc_clnt *rpcb_clnt;
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static struct rpcbind_args *map;
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struct rpc_task *child;
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struct sockaddr_storage addr;
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struct sockaddr *sap = (struct sockaddr *)&addr;
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size_t salen;
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int status;
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dprintk("RPC: %5u %s(%s, %u, %u, %d)\n",
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task->tk_pid, __func__,
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clnt->cl_server, clnt->cl_prog, clnt->cl_vers, xprt->prot);
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/* Autobind on cloned rpc clients is discouraged */
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BUG_ON(clnt->cl_parent != clnt);
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/* Put self on the wait queue to ensure we get notified if
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* some other task is already attempting to bind the port */
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rpc_sleep_on(&xprt->binding, task, NULL);
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if (xprt_test_and_set_binding(xprt)) {
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dprintk("RPC: %5u %s: waiting for another binder\n",
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task->tk_pid, __func__);
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return;
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}
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/* Someone else may have bound if we slept */
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if (xprt_bound(xprt)) {
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status = 0;
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dprintk("RPC: %5u %s: already bound\n",
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task->tk_pid, __func__);
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goto bailout_nofree;
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}
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salen = rpc_peeraddr(clnt, sap, sizeof(addr));
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/* Don't ever use rpcbind v2 for AF_INET6 requests */
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switch (sap->sa_family) {
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case AF_INET:
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proc = rpcb_next_version[xprt->bind_index].rpc_proc;
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bind_version = rpcb_next_version[xprt->bind_index].rpc_vers;
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break;
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case AF_INET6:
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proc = rpcb_next_version6[xprt->bind_index].rpc_proc;
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bind_version = rpcb_next_version6[xprt->bind_index].rpc_vers;
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break;
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default:
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status = -EAFNOSUPPORT;
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dprintk("RPC: %5u %s: bad address family\n",
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task->tk_pid, __func__);
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goto bailout_nofree;
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}
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if (proc == NULL) {
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xprt->bind_index = 0;
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status = -EPFNOSUPPORT;
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dprintk("RPC: %5u %s: no more getport versions available\n",
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task->tk_pid, __func__);
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goto bailout_nofree;
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}
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dprintk("RPC: %5u %s: trying rpcbind version %u\n",
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task->tk_pid, __func__, bind_version);
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rpcb_clnt = rpcb_create(clnt->cl_server, sap, salen, xprt->prot,
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bind_version, 0);
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if (IS_ERR(rpcb_clnt)) {
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status = PTR_ERR(rpcb_clnt);
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dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n",
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task->tk_pid, __func__, PTR_ERR(rpcb_clnt));
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goto bailout_nofree;
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}
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map = kzalloc(sizeof(struct rpcbind_args), GFP_ATOMIC);
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if (!map) {
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status = -ENOMEM;
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dprintk("RPC: %5u %s: no memory available\n",
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task->tk_pid, __func__);
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goto bailout_nofree;
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}
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map->r_prog = clnt->cl_prog;
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map->r_vers = clnt->cl_vers;
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map->r_prot = xprt->prot;
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map->r_port = 0;
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map->r_xprt = xprt_get(xprt);
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map->r_netid = rpc_peeraddr2str(clnt, RPC_DISPLAY_NETID);
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map->r_addr = rpc_peeraddr2str(rpcb_clnt, RPC_DISPLAY_UNIVERSAL_ADDR);
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map->r_owner = RPCB_OWNER_STRING; /* ignored for GETADDR */
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map->r_status = -EIO;
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child = rpcb_call_async(rpcb_clnt, map, proc);
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rpc_release_client(rpcb_clnt);
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if (IS_ERR(child)) {
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/* rpcb_map_release() has freed the arguments */
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dprintk("RPC: %5u %s: rpc_run_task failed\n",
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task->tk_pid, __func__);
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return;
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}
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rpc_put_task(child);
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task->tk_xprt->stat.bind_count++;
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return;
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bailout_nofree:
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rpcb_wake_rpcbind_waiters(xprt, status);
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task->tk_status = status;
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}
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EXPORT_SYMBOL_GPL(rpcb_getport_async);
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/*
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* Rpcbind child task calls this callback via tk_exit.
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*/
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static void rpcb_getport_done(struct rpc_task *child, void *data)
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{
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struct rpcbind_args *map = data;
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struct rpc_xprt *xprt = map->r_xprt;
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int status = child->tk_status;
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/* Garbage reply: retry with a lesser rpcbind version */
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if (status == -EIO)
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status = -EPROTONOSUPPORT;
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/* rpcbind server doesn't support this rpcbind protocol version */
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if (status == -EPROTONOSUPPORT)
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xprt->bind_index++;
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if (status < 0) {
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/* rpcbind server not available on remote host? */
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xprt->ops->set_port(xprt, 0);
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} else if (map->r_port == 0) {
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/* Requested RPC service wasn't registered on remote host */
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xprt->ops->set_port(xprt, 0);
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status = -EACCES;
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} else {
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/* Succeeded */
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xprt->ops->set_port(xprt, map->r_port);
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xprt_set_bound(xprt);
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status = 0;
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}
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dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n",
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child->tk_pid, status, map->r_port);
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map->r_status = status;
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}
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/*
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* XDR functions for rpcbind
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*/
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static int rpcb_encode_mapping(struct rpc_rqst *req, __be32 *p,
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struct rpcbind_args *rpcb)
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{
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dprintk("RPC: rpcb_encode_mapping(%u, %u, %d, %u)\n",
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rpcb->r_prog, rpcb->r_vers, rpcb->r_prot, rpcb->r_port);
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*p++ = htonl(rpcb->r_prog);
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*p++ = htonl(rpcb->r_vers);
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*p++ = htonl(rpcb->r_prot);
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*p++ = htonl(rpcb->r_port);
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req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
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return 0;
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}
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static int rpcb_decode_getport(struct rpc_rqst *req, __be32 *p,
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unsigned short *portp)
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{
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*portp = (unsigned short) ntohl(*p++);
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dprintk("RPC: rpcb_decode_getport result %u\n",
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*portp);
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return 0;
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}
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static int rpcb_decode_set(struct rpc_rqst *req, __be32 *p,
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unsigned int *boolp)
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{
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*boolp = (unsigned int) ntohl(*p++);
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dprintk("RPC: rpcb_decode_set: call %s\n",
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(*boolp ? "succeeded" : "failed"));
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return 0;
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}
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static int rpcb_encode_getaddr(struct rpc_rqst *req, __be32 *p,
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struct rpcbind_args *rpcb)
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{
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dprintk("RPC: rpcb_encode_getaddr(%u, %u, %s)\n",
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rpcb->r_prog, rpcb->r_vers, rpcb->r_addr);
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*p++ = htonl(rpcb->r_prog);
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*p++ = htonl(rpcb->r_vers);
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p = xdr_encode_string(p, rpcb->r_netid);
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p = xdr_encode_string(p, rpcb->r_addr);
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p = xdr_encode_string(p, rpcb->r_owner);
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req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
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return 0;
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}
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|
|
|
static int rpcb_decode_getaddr(struct rpc_rqst *req, __be32 *p,
|
|
unsigned short *portp)
|
|
{
|
|
char *addr;
|
|
u32 addr_len;
|
|
int c, i, f, first, val;
|
|
|
|
*portp = 0;
|
|
addr_len = ntohl(*p++);
|
|
|
|
/*
|
|
* Simple sanity check. The smallest possible universal
|
|
* address is an IPv4 address string containing 11 bytes.
|
|
*/
|
|
if (addr_len < 11 || addr_len > RPCBIND_MAXUADDRLEN)
|
|
goto out_err;
|
|
|
|
/*
|
|
* Start at the end and walk backwards until the first dot
|
|
* is encountered. When the second dot is found, we have
|
|
* both parts of the port number.
|
|
*/
|
|
addr = (char *)p;
|
|
val = 0;
|
|
first = 1;
|
|
f = 1;
|
|
for (i = addr_len - 1; i > 0; i--) {
|
|
c = addr[i];
|
|
if (c >= '0' && c <= '9') {
|
|
val += (c - '0') * f;
|
|
f *= 10;
|
|
} else if (c == '.') {
|
|
if (first) {
|
|
*portp = val;
|
|
val = first = 0;
|
|
f = 1;
|
|
} else {
|
|
*portp |= (val << 8);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Simple sanity check. If we never saw a dot in the reply,
|
|
* then this was probably just garbage.
|
|
*/
|
|
if (first)
|
|
goto out_err;
|
|
|
|
dprintk("RPC: rpcb_decode_getaddr port=%u\n", *portp);
|
|
return 0;
|
|
|
|
out_err:
|
|
dprintk("RPC: rpcbind server returned malformed reply\n");
|
|
return -EIO;
|
|
}
|
|
|
|
#define RPCB_program_sz (1u)
|
|
#define RPCB_version_sz (1u)
|
|
#define RPCB_protocol_sz (1u)
|
|
#define RPCB_port_sz (1u)
|
|
#define RPCB_boolean_sz (1u)
|
|
|
|
#define RPCB_netid_sz (1+XDR_QUADLEN(RPCBIND_MAXNETIDLEN))
|
|
#define RPCB_addr_sz (1+XDR_QUADLEN(RPCBIND_MAXUADDRLEN))
|
|
#define RPCB_ownerstring_sz (1+XDR_QUADLEN(RPCB_MAXOWNERLEN))
|
|
|
|
#define RPCB_mappingargs_sz RPCB_program_sz+RPCB_version_sz+ \
|
|
RPCB_protocol_sz+RPCB_port_sz
|
|
#define RPCB_getaddrargs_sz RPCB_program_sz+RPCB_version_sz+ \
|
|
RPCB_netid_sz+RPCB_addr_sz+ \
|
|
RPCB_ownerstring_sz
|
|
|
|
#define RPCB_setres_sz RPCB_boolean_sz
|
|
#define RPCB_getportres_sz RPCB_port_sz
|
|
|
|
/*
|
|
* Note that RFC 1833 does not put any size restrictions on the
|
|
* address string returned by the remote rpcbind database.
|
|
*/
|
|
#define RPCB_getaddrres_sz RPCB_addr_sz
|
|
|
|
#define PROC(proc, argtype, restype) \
|
|
[RPCBPROC_##proc] = { \
|
|
.p_proc = RPCBPROC_##proc, \
|
|
.p_encode = (kxdrproc_t) rpcb_encode_##argtype, \
|
|
.p_decode = (kxdrproc_t) rpcb_decode_##restype, \
|
|
.p_arglen = RPCB_##argtype##args_sz, \
|
|
.p_replen = RPCB_##restype##res_sz, \
|
|
.p_statidx = RPCBPROC_##proc, \
|
|
.p_timer = 0, \
|
|
.p_name = #proc, \
|
|
}
|
|
|
|
/*
|
|
* Not all rpcbind procedures described in RFC 1833 are implemented
|
|
* since the Linux kernel RPC code requires only these.
|
|
*/
|
|
static struct rpc_procinfo rpcb_procedures2[] = {
|
|
PROC(SET, mapping, set),
|
|
PROC(UNSET, mapping, set),
|
|
PROC(GETPORT, mapping, getport),
|
|
};
|
|
|
|
static struct rpc_procinfo rpcb_procedures3[] = {
|
|
PROC(SET, getaddr, set),
|
|
PROC(UNSET, getaddr, set),
|
|
PROC(GETADDR, getaddr, getaddr),
|
|
};
|
|
|
|
static struct rpc_procinfo rpcb_procedures4[] = {
|
|
PROC(SET, getaddr, set),
|
|
PROC(UNSET, getaddr, set),
|
|
PROC(GETADDR, getaddr, getaddr),
|
|
PROC(GETVERSADDR, getaddr, getaddr),
|
|
};
|
|
|
|
static struct rpcb_info rpcb_next_version[] = {
|
|
{
|
|
.rpc_vers = RPCBVERS_2,
|
|
.rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT],
|
|
},
|
|
{
|
|
.rpc_proc = NULL,
|
|
},
|
|
};
|
|
|
|
static struct rpcb_info rpcb_next_version6[] = {
|
|
{
|
|
.rpc_vers = RPCBVERS_4,
|
|
.rpc_proc = &rpcb_procedures4[RPCBPROC_GETADDR],
|
|
},
|
|
{
|
|
.rpc_vers = RPCBVERS_3,
|
|
.rpc_proc = &rpcb_procedures3[RPCBPROC_GETADDR],
|
|
},
|
|
{
|
|
.rpc_proc = NULL,
|
|
},
|
|
};
|
|
|
|
static struct rpc_version rpcb_version2 = {
|
|
.number = RPCBVERS_2,
|
|
.nrprocs = RPCB_HIGHPROC_2,
|
|
.procs = rpcb_procedures2
|
|
};
|
|
|
|
static struct rpc_version rpcb_version3 = {
|
|
.number = RPCBVERS_3,
|
|
.nrprocs = RPCB_HIGHPROC_3,
|
|
.procs = rpcb_procedures3
|
|
};
|
|
|
|
static struct rpc_version rpcb_version4 = {
|
|
.number = RPCBVERS_4,
|
|
.nrprocs = RPCB_HIGHPROC_4,
|
|
.procs = rpcb_procedures4
|
|
};
|
|
|
|
static struct rpc_version *rpcb_version[] = {
|
|
NULL,
|
|
NULL,
|
|
&rpcb_version2,
|
|
&rpcb_version3,
|
|
&rpcb_version4
|
|
};
|
|
|
|
static struct rpc_stat rpcb_stats;
|
|
|
|
static struct rpc_program rpcb_program = {
|
|
.name = "rpcbind",
|
|
.number = RPCBIND_PROGRAM,
|
|
.nrvers = ARRAY_SIZE(rpcb_version),
|
|
.version = rpcb_version,
|
|
.stats = &rpcb_stats,
|
|
};
|