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1149 lines
30 KiB
C
1149 lines
30 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/un.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/mutex.h>
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#include <linux/slab.h>
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#include <net/ipv6.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/sunrpc/addr.h>
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#include <linux/sunrpc/sched.h>
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#include <linux/sunrpc/xprtsock.h>
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#include "netns.h"
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#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
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# define RPCDBG_FACILITY RPCDBG_BIND
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#endif
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#define RPCBIND_SOCK_PATHNAME "/var/run/rpcbind.sock"
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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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/*
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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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*
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* For AF_LOCAL SET/UNSET requests, rpcbind treats this string as a
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* UID which it maps to a local user name via a password lookup.
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* In all other cases it is ignored.
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*
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* For SET/UNSET requests, user space provides a value, even for
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* network requests, and GETADDR uses an empty string. We follow
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* those precedents here.
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*/
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#define RPCB_OWNER_STRING "0"
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#define RPCB_MAXOWNERLEN sizeof(RPCB_OWNER_STRING)
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/*
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* XDR data type sizes
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*/
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#define RPCB_program_sz (1)
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#define RPCB_version_sz (1)
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#define RPCB_protocol_sz (1)
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#define RPCB_port_sz (1)
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#define RPCB_boolean_sz (1)
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#define RPCB_netid_sz (1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN))
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#define RPCB_addr_sz (1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN))
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#define RPCB_ownerstring_sz (1 + XDR_QUADLEN(RPCB_MAXOWNERLEN))
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/*
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* XDR argument and result sizes
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*/
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#define RPCB_mappingargs_sz (RPCB_program_sz + RPCB_version_sz + \
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RPCB_protocol_sz + RPCB_port_sz)
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#define RPCB_getaddrargs_sz (RPCB_program_sz + RPCB_version_sz + \
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RPCB_netid_sz + RPCB_addr_sz + \
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RPCB_ownerstring_sz)
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#define RPCB_getportres_sz RPCB_port_sz
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#define RPCB_setres_sz RPCB_boolean_sz
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/*
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* Note that RFC 1833 does not put any size restrictions on the
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* address string returned by the remote rpcbind database.
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*/
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#define RPCB_getaddrres_sz RPCB_addr_sz
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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 const 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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static struct rpc_procinfo rpcb_procedures4[];
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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 const struct rpcb_info rpcb_next_version[];
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static const 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->r_addr);
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kfree(map);
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}
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static int rpcb_get_local(struct net *net)
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{
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int cnt;
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struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
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spin_lock(&sn->rpcb_clnt_lock);
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if (sn->rpcb_users)
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sn->rpcb_users++;
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cnt = sn->rpcb_users;
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spin_unlock(&sn->rpcb_clnt_lock);
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return cnt;
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}
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void rpcb_put_local(struct net *net)
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{
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struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
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struct rpc_clnt *clnt = sn->rpcb_local_clnt;
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struct rpc_clnt *clnt4 = sn->rpcb_local_clnt4;
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int shutdown = 0;
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spin_lock(&sn->rpcb_clnt_lock);
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if (sn->rpcb_users) {
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if (--sn->rpcb_users == 0) {
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sn->rpcb_local_clnt = NULL;
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sn->rpcb_local_clnt4 = NULL;
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}
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shutdown = !sn->rpcb_users;
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}
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spin_unlock(&sn->rpcb_clnt_lock);
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if (shutdown) {
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/*
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* cleanup_rpcb_clnt - remove xprtsock's sysctls, unregister
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*/
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if (clnt4)
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rpc_shutdown_client(clnt4);
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if (clnt)
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rpc_shutdown_client(clnt);
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}
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}
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static void rpcb_set_local(struct net *net, struct rpc_clnt *clnt,
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struct rpc_clnt *clnt4,
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bool is_af_local)
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{
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struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
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/* Protected by rpcb_create_local_mutex */
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sn->rpcb_local_clnt = clnt;
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sn->rpcb_local_clnt4 = clnt4;
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sn->rpcb_is_af_local = is_af_local ? 1 : 0;
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smp_wmb();
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sn->rpcb_users = 1;
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dprintk("RPC: created new rpcb local clients (rpcb_local_clnt: "
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"%p, rpcb_local_clnt4: %p) for net %p%s\n",
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sn->rpcb_local_clnt, sn->rpcb_local_clnt4,
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net, (net == &init_net) ? " (init_net)" : "");
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}
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/*
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* Returns zero on success, otherwise a negative errno value
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* is returned.
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*/
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static int rpcb_create_local_unix(struct net *net)
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{
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static const struct sockaddr_un rpcb_localaddr_rpcbind = {
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.sun_family = AF_LOCAL,
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.sun_path = RPCBIND_SOCK_PATHNAME,
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};
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struct rpc_create_args args = {
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.net = net,
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.protocol = XPRT_TRANSPORT_LOCAL,
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.address = (struct sockaddr *)&rpcb_localaddr_rpcbind,
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.addrsize = sizeof(rpcb_localaddr_rpcbind),
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.servername = "localhost",
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.program = &rpcb_program,
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.version = RPCBVERS_2,
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.authflavor = RPC_AUTH_NULL,
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/*
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* We turn off the idle timeout to prevent the kernel
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* from automatically disconnecting the socket.
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* Otherwise, we'd have to cache the mount namespace
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* of the caller and somehow pass that to the socket
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* reconnect code.
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*/
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.flags = RPC_CLNT_CREATE_NO_IDLE_TIMEOUT,
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};
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struct rpc_clnt *clnt, *clnt4;
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int result = 0;
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/*
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* Because we requested an RPC PING at transport creation time,
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* this works only if the user space portmapper is rpcbind, and
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* it's listening on AF_LOCAL on the named socket.
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*/
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clnt = rpc_create(&args);
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if (IS_ERR(clnt)) {
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dprintk("RPC: failed to create AF_LOCAL rpcbind "
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"client (errno %ld).\n", PTR_ERR(clnt));
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result = PTR_ERR(clnt);
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goto out;
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}
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clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4);
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if (IS_ERR(clnt4)) {
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dprintk("RPC: failed to bind second program to "
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"rpcbind v4 client (errno %ld).\n",
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PTR_ERR(clnt4));
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clnt4 = NULL;
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}
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rpcb_set_local(net, clnt, clnt4, true);
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out:
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return result;
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}
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/*
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* Returns zero on success, otherwise a negative errno value
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* is returned.
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*/
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static int rpcb_create_local_net(struct net *net)
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{
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static const struct sockaddr_in rpcb_inaddr_loopback = {
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.sin_family = AF_INET,
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.sin_addr.s_addr = htonl(INADDR_LOOPBACK),
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.sin_port = htons(RPCBIND_PORT),
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};
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struct rpc_create_args args = {
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.net = net,
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.protocol = XPRT_TRANSPORT_TCP,
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.address = (struct sockaddr *)&rpcb_inaddr_loopback,
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.addrsize = sizeof(rpcb_inaddr_loopback),
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.servername = "localhost",
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.program = &rpcb_program,
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.version = RPCBVERS_2,
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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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struct rpc_clnt *clnt, *clnt4;
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int result = 0;
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clnt = rpc_create(&args);
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if (IS_ERR(clnt)) {
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dprintk("RPC: failed to create local rpcbind "
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"client (errno %ld).\n", PTR_ERR(clnt));
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result = PTR_ERR(clnt);
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goto out;
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}
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/*
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* This results in an RPC ping. On systems running portmapper,
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* the v4 ping will fail. Proceed anyway, but disallow rpcb
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* v4 upcalls.
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*/
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clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4);
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if (IS_ERR(clnt4)) {
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dprintk("RPC: failed to bind second program to "
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"rpcbind v4 client (errno %ld).\n",
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PTR_ERR(clnt4));
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clnt4 = NULL;
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}
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rpcb_set_local(net, clnt, clnt4, false);
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out:
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return result;
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}
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/*
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* Returns zero on success, otherwise a negative errno value
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* is returned.
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*/
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int rpcb_create_local(struct net *net)
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{
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static DEFINE_MUTEX(rpcb_create_local_mutex);
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int result = 0;
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if (rpcb_get_local(net))
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return result;
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mutex_lock(&rpcb_create_local_mutex);
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if (rpcb_get_local(net))
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goto out;
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if (rpcb_create_local_unix(net) != 0)
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result = rpcb_create_local_net(net);
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out:
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mutex_unlock(&rpcb_create_local_mutex);
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return result;
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}
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static struct rpc_clnt *rpcb_create(struct net *net, const char *nodename,
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const char *hostname,
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struct sockaddr *srvaddr, size_t salen,
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int proto, u32 version)
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{
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struct rpc_create_args args = {
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.net = net,
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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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.nodename = nodename,
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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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RPC_CLNT_CREATE_NONPRIVPORT),
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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 ERR_PTR(-EAFNOSUPPORT);
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}
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return rpc_create(&args);
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}
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static int rpcb_register_call(struct sunrpc_net *sn, struct rpc_clnt *clnt, struct rpc_message *msg, bool is_set)
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{
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int flags = RPC_TASK_NOCONNECT;
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int error, result = 0;
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if (is_set || !sn->rpcb_is_af_local)
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flags = RPC_TASK_SOFTCONN;
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msg->rpc_resp = &result;
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error = rpc_call_sync(clnt, msg, flags);
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if (error < 0) {
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dprintk("RPC: failed to contact local rpcbind "
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"server (errno %d).\n", -error);
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return error;
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}
|
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|
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if (!result)
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return -EACCES;
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return 0;
|
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}
|
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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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* @net: target network namespace
|
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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 register
|
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* @port: port value to register
|
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*
|
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* Returns zero if the registration request was dispatched successfully
|
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* and the rpcbind daemon returned success. Otherwise, returns an errno
|
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* value that reflects the nature of the error (request could not be
|
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* dispatched, timed out, or rpcbind returned an error).
|
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*
|
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* RPC services invoke this function to advertise their contact
|
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* information via the system's rpcbind daemon. RPC services
|
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* invoke this function once for each [program, version, transport]
|
|
* tuple they wish to advertise.
|
|
*
|
|
* Callers may also unregister RPC services that are no longer
|
|
* available by setting the passed-in port to zero. This removes
|
|
* all registered transports for [program, version] from the local
|
|
* rpcbind database.
|
|
*
|
|
* This function uses rpcbind protocol version 2 to contact the
|
|
* local rpcbind daemon.
|
|
*
|
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* Registration works over both AF_INET and AF_INET6, and services
|
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* registered via this function are advertised as available for any
|
|
* address. If the local rpcbind daemon is listening on AF_INET6,
|
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* services registered via this function will be advertised on
|
|
* IN6ADDR_ANY (ie available for all AF_INET and AF_INET6
|
|
* addresses).
|
|
*/
|
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int rpcb_register(struct net *net, u32 prog, u32 vers, int prot, unsigned short port)
|
|
{
|
|
struct rpcbind_args map = {
|
|
.r_prog = prog,
|
|
.r_vers = vers,
|
|
.r_prot = prot,
|
|
.r_port = port,
|
|
};
|
|
struct rpc_message msg = {
|
|
.rpc_argp = &map,
|
|
};
|
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
|
|
bool is_set = false;
|
|
|
|
dprintk("RPC: %sregistering (%u, %u, %d, %u) with local "
|
|
"rpcbind\n", (port ? "" : "un"),
|
|
prog, vers, prot, port);
|
|
|
|
msg.rpc_proc = &rpcb_procedures2[RPCBPROC_UNSET];
|
|
if (port != 0) {
|
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msg.rpc_proc = &rpcb_procedures2[RPCBPROC_SET];
|
|
is_set = true;
|
|
}
|
|
|
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return rpcb_register_call(sn, sn->rpcb_local_clnt, &msg, is_set);
|
|
}
|
|
|
|
/*
|
|
* Fill in AF_INET family-specific arguments to register
|
|
*/
|
|
static int rpcb_register_inet4(struct sunrpc_net *sn,
|
|
const struct sockaddr *sap,
|
|
struct rpc_message *msg)
|
|
{
|
|
const struct sockaddr_in *sin = (const struct sockaddr_in *)sap;
|
|
struct rpcbind_args *map = msg->rpc_argp;
|
|
unsigned short port = ntohs(sin->sin_port);
|
|
bool is_set = false;
|
|
int result;
|
|
|
|
map->r_addr = rpc_sockaddr2uaddr(sap, GFP_KERNEL);
|
|
|
|
dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with "
|
|
"local rpcbind\n", (port ? "" : "un"),
|
|
map->r_prog, map->r_vers,
|
|
map->r_addr, map->r_netid);
|
|
|
|
msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
|
|
if (port != 0) {
|
|
msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
|
|
is_set = true;
|
|
}
|
|
|
|
result = rpcb_register_call(sn, sn->rpcb_local_clnt4, msg, is_set);
|
|
kfree(map->r_addr);
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Fill in AF_INET6 family-specific arguments to register
|
|
*/
|
|
static int rpcb_register_inet6(struct sunrpc_net *sn,
|
|
const struct sockaddr *sap,
|
|
struct rpc_message *msg)
|
|
{
|
|
const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sap;
|
|
struct rpcbind_args *map = msg->rpc_argp;
|
|
unsigned short port = ntohs(sin6->sin6_port);
|
|
bool is_set = false;
|
|
int result;
|
|
|
|
map->r_addr = rpc_sockaddr2uaddr(sap, GFP_KERNEL);
|
|
|
|
dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with "
|
|
"local rpcbind\n", (port ? "" : "un"),
|
|
map->r_prog, map->r_vers,
|
|
map->r_addr, map->r_netid);
|
|
|
|
msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
|
|
if (port != 0) {
|
|
msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
|
|
is_set = true;
|
|
}
|
|
|
|
result = rpcb_register_call(sn, sn->rpcb_local_clnt4, msg, is_set);
|
|
kfree(map->r_addr);
|
|
return result;
|
|
}
|
|
|
|
static int rpcb_unregister_all_protofamilies(struct sunrpc_net *sn,
|
|
struct rpc_message *msg)
|
|
{
|
|
struct rpcbind_args *map = msg->rpc_argp;
|
|
|
|
dprintk("RPC: unregistering [%u, %u, '%s'] with "
|
|
"local rpcbind\n",
|
|
map->r_prog, map->r_vers, map->r_netid);
|
|
|
|
map->r_addr = "";
|
|
msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
|
|
|
|
return rpcb_register_call(sn, sn->rpcb_local_clnt4, msg, false);
|
|
}
|
|
|
|
/**
|
|
* rpcb_v4_register - set or unset a port registration with the local rpcbind
|
|
* @net: target network namespace
|
|
* @program: RPC program number of service to (un)register
|
|
* @version: RPC version number of service to (un)register
|
|
* @address: address family, IP address, and port to (un)register
|
|
* @netid: netid of transport protocol to (un)register
|
|
*
|
|
* Returns zero if the registration request was dispatched successfully
|
|
* and the rpcbind daemon returned success. Otherwise, returns an errno
|
|
* value that reflects the nature of the error (request could not be
|
|
* dispatched, timed out, or rpcbind returned an error).
|
|
*
|
|
* RPC services invoke this function to advertise their contact
|
|
* information via the system's rpcbind daemon. RPC services
|
|
* invoke this function once for each [program, version, address,
|
|
* netid] tuple they wish to advertise.
|
|
*
|
|
* Callers may also unregister RPC services that are registered at a
|
|
* specific address by setting the port number in @address to zero.
|
|
* They may unregister all registered protocol families at once for
|
|
* a service by passing a NULL @address argument. If @netid is ""
|
|
* then all netids for [program, version, address] are unregistered.
|
|
*
|
|
* This function uses rpcbind protocol version 4 to contact the
|
|
* local rpcbind daemon. The local rpcbind daemon must support
|
|
* version 4 of the rpcbind protocol in order for these functions
|
|
* to register a service successfully.
|
|
*
|
|
* Supported netids include "udp" and "tcp" for UDP and TCP over
|
|
* IPv4, and "udp6" and "tcp6" for UDP and TCP over IPv6,
|
|
* respectively.
|
|
*
|
|
* The contents of @address determine the address family and the
|
|
* port to be registered. The usual practice is to pass INADDR_ANY
|
|
* as the raw address, but specifying a non-zero address is also
|
|
* supported by this API if the caller wishes to advertise an RPC
|
|
* service on a specific network interface.
|
|
*
|
|
* Note that passing in INADDR_ANY does not create the same service
|
|
* registration as IN6ADDR_ANY. The former advertises an RPC
|
|
* service on any IPv4 address, but not on IPv6. The latter
|
|
* advertises the service on all IPv4 and IPv6 addresses.
|
|
*/
|
|
int rpcb_v4_register(struct net *net, const u32 program, const u32 version,
|
|
const struct sockaddr *address, const char *netid)
|
|
{
|
|
struct rpcbind_args map = {
|
|
.r_prog = program,
|
|
.r_vers = version,
|
|
.r_netid = netid,
|
|
.r_owner = RPCB_OWNER_STRING,
|
|
};
|
|
struct rpc_message msg = {
|
|
.rpc_argp = &map,
|
|
};
|
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
|
|
|
|
if (sn->rpcb_local_clnt4 == NULL)
|
|
return -EPROTONOSUPPORT;
|
|
|
|
if (address == NULL)
|
|
return rpcb_unregister_all_protofamilies(sn, &msg);
|
|
|
|
switch (address->sa_family) {
|
|
case AF_INET:
|
|
return rpcb_register_inet4(sn, address, &msg);
|
|
case AF_INET6:
|
|
return rpcb_register_inet6(sn, address, &msg);
|
|
}
|
|
|
|
return -EAFNOSUPPORT;
|
|
}
|
|
|
|
static struct rpc_task *rpcb_call_async(struct rpc_clnt *rpcb_clnt, struct rpcbind_args *map, struct rpc_procinfo *proc)
|
|
{
|
|
struct rpc_message msg = {
|
|
.rpc_proc = proc,
|
|
.rpc_argp = map,
|
|
.rpc_resp = map,
|
|
};
|
|
struct rpc_task_setup task_setup_data = {
|
|
.rpc_client = rpcb_clnt,
|
|
.rpc_message = &msg,
|
|
.callback_ops = &rpcb_getport_ops,
|
|
.callback_data = map,
|
|
.flags = RPC_TASK_ASYNC | RPC_TASK_SOFTCONN,
|
|
};
|
|
|
|
return rpc_run_task(&task_setup_data);
|
|
}
|
|
|
|
/*
|
|
* In the case where rpc clients have been cloned, we want to make
|
|
* sure that we use the program number/version etc of the actual
|
|
* owner of the xprt. To do so, we walk back up the tree of parents
|
|
* to find whoever created the transport and/or whoever has the
|
|
* autobind flag set.
|
|
*/
|
|
static struct rpc_clnt *rpcb_find_transport_owner(struct rpc_clnt *clnt)
|
|
{
|
|
struct rpc_clnt *parent = clnt->cl_parent;
|
|
struct rpc_xprt_switch *xps = rcu_access_pointer(clnt->cl_xpi.xpi_xpswitch);
|
|
|
|
while (parent != clnt) {
|
|
if (rcu_access_pointer(parent->cl_xpi.xpi_xpswitch) != xps)
|
|
break;
|
|
if (clnt->cl_autobind)
|
|
break;
|
|
clnt = parent;
|
|
parent = parent->cl_parent;
|
|
}
|
|
return clnt;
|
|
}
|
|
|
|
/**
|
|
* rpcb_getport_async - 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 rpcb_getport_async(struct rpc_task *task)
|
|
{
|
|
struct rpc_clnt *clnt;
|
|
struct rpc_procinfo *proc;
|
|
u32 bind_version;
|
|
struct rpc_xprt *xprt;
|
|
struct rpc_clnt *rpcb_clnt;
|
|
struct rpcbind_args *map;
|
|
struct rpc_task *child;
|
|
struct sockaddr_storage addr;
|
|
struct sockaddr *sap = (struct sockaddr *)&addr;
|
|
size_t salen;
|
|
int status;
|
|
|
|
rcu_read_lock();
|
|
clnt = rpcb_find_transport_owner(task->tk_client);
|
|
rcu_read_unlock();
|
|
xprt = xprt_get(task->tk_xprt);
|
|
|
|
dprintk("RPC: %5u %s(%s, %u, %u, %d)\n",
|
|
task->tk_pid, __func__,
|
|
xprt->servername, clnt->cl_prog, clnt->cl_vers, xprt->prot);
|
|
|
|
/* Put self on the wait queue to ensure we get notified if
|
|
* some other task is already attempting to bind the port */
|
|
rpc_sleep_on(&xprt->binding, task, NULL);
|
|
|
|
if (xprt_test_and_set_binding(xprt)) {
|
|
dprintk("RPC: %5u %s: waiting for another binder\n",
|
|
task->tk_pid, __func__);
|
|
xprt_put(xprt);
|
|
return;
|
|
}
|
|
|
|
/* Someone else may have bound if we slept */
|
|
if (xprt_bound(xprt)) {
|
|
status = 0;
|
|
dprintk("RPC: %5u %s: already bound\n",
|
|
task->tk_pid, __func__);
|
|
goto bailout_nofree;
|
|
}
|
|
|
|
/* Parent transport's destination address */
|
|
salen = rpc_peeraddr(clnt, sap, sizeof(addr));
|
|
|
|
/* Don't ever use rpcbind v2 for AF_INET6 requests */
|
|
switch (sap->sa_family) {
|
|
case AF_INET:
|
|
proc = rpcb_next_version[xprt->bind_index].rpc_proc;
|
|
bind_version = rpcb_next_version[xprt->bind_index].rpc_vers;
|
|
break;
|
|
case AF_INET6:
|
|
proc = rpcb_next_version6[xprt->bind_index].rpc_proc;
|
|
bind_version = rpcb_next_version6[xprt->bind_index].rpc_vers;
|
|
break;
|
|
default:
|
|
status = -EAFNOSUPPORT;
|
|
dprintk("RPC: %5u %s: bad address family\n",
|
|
task->tk_pid, __func__);
|
|
goto bailout_nofree;
|
|
}
|
|
if (proc == NULL) {
|
|
xprt->bind_index = 0;
|
|
status = -EPFNOSUPPORT;
|
|
dprintk("RPC: %5u %s: no more getport versions available\n",
|
|
task->tk_pid, __func__);
|
|
goto bailout_nofree;
|
|
}
|
|
|
|
dprintk("RPC: %5u %s: trying rpcbind version %u\n",
|
|
task->tk_pid, __func__, bind_version);
|
|
|
|
rpcb_clnt = rpcb_create(xprt->xprt_net,
|
|
clnt->cl_nodename,
|
|
xprt->servername, sap, salen,
|
|
xprt->prot, bind_version);
|
|
if (IS_ERR(rpcb_clnt)) {
|
|
status = PTR_ERR(rpcb_clnt);
|
|
dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n",
|
|
task->tk_pid, __func__, PTR_ERR(rpcb_clnt));
|
|
goto bailout_nofree;
|
|
}
|
|
|
|
map = kzalloc(sizeof(struct rpcbind_args), GFP_ATOMIC);
|
|
if (!map) {
|
|
status = -ENOMEM;
|
|
dprintk("RPC: %5u %s: no memory available\n",
|
|
task->tk_pid, __func__);
|
|
goto bailout_release_client;
|
|
}
|
|
map->r_prog = clnt->cl_prog;
|
|
map->r_vers = clnt->cl_vers;
|
|
map->r_prot = xprt->prot;
|
|
map->r_port = 0;
|
|
map->r_xprt = xprt;
|
|
map->r_status = -EIO;
|
|
|
|
switch (bind_version) {
|
|
case RPCBVERS_4:
|
|
case RPCBVERS_3:
|
|
map->r_netid = xprt->address_strings[RPC_DISPLAY_NETID];
|
|
map->r_addr = rpc_sockaddr2uaddr(sap, GFP_ATOMIC);
|
|
map->r_owner = "";
|
|
break;
|
|
case RPCBVERS_2:
|
|
map->r_addr = NULL;
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
child = rpcb_call_async(rpcb_clnt, map, proc);
|
|
rpc_release_client(rpcb_clnt);
|
|
if (IS_ERR(child)) {
|
|
/* rpcb_map_release() has freed the arguments */
|
|
dprintk("RPC: %5u %s: rpc_run_task failed\n",
|
|
task->tk_pid, __func__);
|
|
return;
|
|
}
|
|
|
|
xprt->stat.bind_count++;
|
|
rpc_put_task(child);
|
|
return;
|
|
|
|
bailout_release_client:
|
|
rpc_release_client(rpcb_clnt);
|
|
bailout_nofree:
|
|
rpcb_wake_rpcbind_waiters(xprt, status);
|
|
task->tk_status = status;
|
|
xprt_put(xprt);
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpcb_getport_async);
|
|
|
|
/*
|
|
* Rpcbind child task calls this callback via tk_exit.
|
|
*/
|
|
static void rpcb_getport_done(struct rpc_task *child, void *data)
|
|
{
|
|
struct rpcbind_args *map = data;
|
|
struct rpc_xprt *xprt = map->r_xprt;
|
|
int status = child->tk_status;
|
|
|
|
/* Garbage reply: retry with a lesser rpcbind version */
|
|
if (status == -EIO)
|
|
status = -EPROTONOSUPPORT;
|
|
|
|
/* rpcbind server doesn't support this rpcbind protocol version */
|
|
if (status == -EPROTONOSUPPORT)
|
|
xprt->bind_index++;
|
|
|
|
if (status < 0) {
|
|
/* rpcbind server not available on remote host? */
|
|
xprt->ops->set_port(xprt, 0);
|
|
} else if (map->r_port == 0) {
|
|
/* Requested RPC service wasn't registered on remote host */
|
|
xprt->ops->set_port(xprt, 0);
|
|
status = -EACCES;
|
|
} else {
|
|
/* Succeeded */
|
|
xprt->ops->set_port(xprt, map->r_port);
|
|
xprt_set_bound(xprt);
|
|
status = 0;
|
|
}
|
|
|
|
dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n",
|
|
child->tk_pid, status, map->r_port);
|
|
|
|
map->r_status = status;
|
|
}
|
|
|
|
/*
|
|
* XDR functions for rpcbind
|
|
*/
|
|
|
|
static void rpcb_enc_mapping(struct rpc_rqst *req, struct xdr_stream *xdr,
|
|
const struct rpcbind_args *rpcb)
|
|
{
|
|
__be32 *p;
|
|
|
|
dprintk("RPC: %5u encoding PMAP_%s call (%u, %u, %d, %u)\n",
|
|
req->rq_task->tk_pid,
|
|
req->rq_task->tk_msg.rpc_proc->p_name,
|
|
rpcb->r_prog, rpcb->r_vers, rpcb->r_prot, rpcb->r_port);
|
|
|
|
p = xdr_reserve_space(xdr, RPCB_mappingargs_sz << 2);
|
|
*p++ = cpu_to_be32(rpcb->r_prog);
|
|
*p++ = cpu_to_be32(rpcb->r_vers);
|
|
*p++ = cpu_to_be32(rpcb->r_prot);
|
|
*p = cpu_to_be32(rpcb->r_port);
|
|
}
|
|
|
|
static int rpcb_dec_getport(struct rpc_rqst *req, struct xdr_stream *xdr,
|
|
struct rpcbind_args *rpcb)
|
|
{
|
|
unsigned long port;
|
|
__be32 *p;
|
|
|
|
rpcb->r_port = 0;
|
|
|
|
p = xdr_inline_decode(xdr, 4);
|
|
if (unlikely(p == NULL))
|
|
return -EIO;
|
|
|
|
port = be32_to_cpup(p);
|
|
dprintk("RPC: %5u PMAP_%s result: %lu\n", req->rq_task->tk_pid,
|
|
req->rq_task->tk_msg.rpc_proc->p_name, port);
|
|
if (unlikely(port > USHRT_MAX))
|
|
return -EIO;
|
|
|
|
rpcb->r_port = port;
|
|
return 0;
|
|
}
|
|
|
|
static int rpcb_dec_set(struct rpc_rqst *req, struct xdr_stream *xdr,
|
|
unsigned int *boolp)
|
|
{
|
|
__be32 *p;
|
|
|
|
p = xdr_inline_decode(xdr, 4);
|
|
if (unlikely(p == NULL))
|
|
return -EIO;
|
|
|
|
*boolp = 0;
|
|
if (*p != xdr_zero)
|
|
*boolp = 1;
|
|
|
|
dprintk("RPC: %5u RPCB_%s call %s\n",
|
|
req->rq_task->tk_pid,
|
|
req->rq_task->tk_msg.rpc_proc->p_name,
|
|
(*boolp ? "succeeded" : "failed"));
|
|
return 0;
|
|
}
|
|
|
|
static void encode_rpcb_string(struct xdr_stream *xdr, const char *string,
|
|
const u32 maxstrlen)
|
|
{
|
|
__be32 *p;
|
|
u32 len;
|
|
|
|
len = strlen(string);
|
|
WARN_ON_ONCE(len > maxstrlen);
|
|
if (len > maxstrlen)
|
|
/* truncate and hope for the best */
|
|
len = maxstrlen;
|
|
p = xdr_reserve_space(xdr, 4 + len);
|
|
xdr_encode_opaque(p, string, len);
|
|
}
|
|
|
|
static void rpcb_enc_getaddr(struct rpc_rqst *req, struct xdr_stream *xdr,
|
|
const struct rpcbind_args *rpcb)
|
|
{
|
|
__be32 *p;
|
|
|
|
dprintk("RPC: %5u encoding RPCB_%s call (%u, %u, '%s', '%s')\n",
|
|
req->rq_task->tk_pid,
|
|
req->rq_task->tk_msg.rpc_proc->p_name,
|
|
rpcb->r_prog, rpcb->r_vers,
|
|
rpcb->r_netid, rpcb->r_addr);
|
|
|
|
p = xdr_reserve_space(xdr, (RPCB_program_sz + RPCB_version_sz) << 2);
|
|
*p++ = cpu_to_be32(rpcb->r_prog);
|
|
*p = cpu_to_be32(rpcb->r_vers);
|
|
|
|
encode_rpcb_string(xdr, rpcb->r_netid, RPCBIND_MAXNETIDLEN);
|
|
encode_rpcb_string(xdr, rpcb->r_addr, RPCBIND_MAXUADDRLEN);
|
|
encode_rpcb_string(xdr, rpcb->r_owner, RPCB_MAXOWNERLEN);
|
|
}
|
|
|
|
static int rpcb_dec_getaddr(struct rpc_rqst *req, struct xdr_stream *xdr,
|
|
struct rpcbind_args *rpcb)
|
|
{
|
|
struct sockaddr_storage address;
|
|
struct sockaddr *sap = (struct sockaddr *)&address;
|
|
__be32 *p;
|
|
u32 len;
|
|
|
|
rpcb->r_port = 0;
|
|
|
|
p = xdr_inline_decode(xdr, 4);
|
|
if (unlikely(p == NULL))
|
|
goto out_fail;
|
|
len = be32_to_cpup(p);
|
|
|
|
/*
|
|
* If the returned universal address is a null string,
|
|
* the requested RPC service was not registered.
|
|
*/
|
|
if (len == 0) {
|
|
dprintk("RPC: %5u RPCB reply: program not registered\n",
|
|
req->rq_task->tk_pid);
|
|
return 0;
|
|
}
|
|
|
|
if (unlikely(len > RPCBIND_MAXUADDRLEN))
|
|
goto out_fail;
|
|
|
|
p = xdr_inline_decode(xdr, len);
|
|
if (unlikely(p == NULL))
|
|
goto out_fail;
|
|
dprintk("RPC: %5u RPCB_%s reply: %s\n", req->rq_task->tk_pid,
|
|
req->rq_task->tk_msg.rpc_proc->p_name, (char *)p);
|
|
|
|
if (rpc_uaddr2sockaddr(req->rq_xprt->xprt_net, (char *)p, len,
|
|
sap, sizeof(address)) == 0)
|
|
goto out_fail;
|
|
rpcb->r_port = rpc_get_port(sap);
|
|
|
|
return 0;
|
|
|
|
out_fail:
|
|
dprintk("RPC: %5u malformed RPCB_%s reply\n",
|
|
req->rq_task->tk_pid,
|
|
req->rq_task->tk_msg.rpc_proc->p_name);
|
|
return -EIO;
|
|
}
|
|
|
|
/*
|
|
* 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[] = {
|
|
[RPCBPROC_SET] = {
|
|
.p_proc = RPCBPROC_SET,
|
|
.p_encode = (kxdreproc_t)rpcb_enc_mapping,
|
|
.p_decode = (kxdrdproc_t)rpcb_dec_set,
|
|
.p_arglen = RPCB_mappingargs_sz,
|
|
.p_replen = RPCB_setres_sz,
|
|
.p_statidx = RPCBPROC_SET,
|
|
.p_timer = 0,
|
|
.p_name = "SET",
|
|
},
|
|
[RPCBPROC_UNSET] = {
|
|
.p_proc = RPCBPROC_UNSET,
|
|
.p_encode = (kxdreproc_t)rpcb_enc_mapping,
|
|
.p_decode = (kxdrdproc_t)rpcb_dec_set,
|
|
.p_arglen = RPCB_mappingargs_sz,
|
|
.p_replen = RPCB_setres_sz,
|
|
.p_statidx = RPCBPROC_UNSET,
|
|
.p_timer = 0,
|
|
.p_name = "UNSET",
|
|
},
|
|
[RPCBPROC_GETPORT] = {
|
|
.p_proc = RPCBPROC_GETPORT,
|
|
.p_encode = (kxdreproc_t)rpcb_enc_mapping,
|
|
.p_decode = (kxdrdproc_t)rpcb_dec_getport,
|
|
.p_arglen = RPCB_mappingargs_sz,
|
|
.p_replen = RPCB_getportres_sz,
|
|
.p_statidx = RPCBPROC_GETPORT,
|
|
.p_timer = 0,
|
|
.p_name = "GETPORT",
|
|
},
|
|
};
|
|
|
|
static struct rpc_procinfo rpcb_procedures3[] = {
|
|
[RPCBPROC_SET] = {
|
|
.p_proc = RPCBPROC_SET,
|
|
.p_encode = (kxdreproc_t)rpcb_enc_getaddr,
|
|
.p_decode = (kxdrdproc_t)rpcb_dec_set,
|
|
.p_arglen = RPCB_getaddrargs_sz,
|
|
.p_replen = RPCB_setres_sz,
|
|
.p_statidx = RPCBPROC_SET,
|
|
.p_timer = 0,
|
|
.p_name = "SET",
|
|
},
|
|
[RPCBPROC_UNSET] = {
|
|
.p_proc = RPCBPROC_UNSET,
|
|
.p_encode = (kxdreproc_t)rpcb_enc_getaddr,
|
|
.p_decode = (kxdrdproc_t)rpcb_dec_set,
|
|
.p_arglen = RPCB_getaddrargs_sz,
|
|
.p_replen = RPCB_setres_sz,
|
|
.p_statidx = RPCBPROC_UNSET,
|
|
.p_timer = 0,
|
|
.p_name = "UNSET",
|
|
},
|
|
[RPCBPROC_GETADDR] = {
|
|
.p_proc = RPCBPROC_GETADDR,
|
|
.p_encode = (kxdreproc_t)rpcb_enc_getaddr,
|
|
.p_decode = (kxdrdproc_t)rpcb_dec_getaddr,
|
|
.p_arglen = RPCB_getaddrargs_sz,
|
|
.p_replen = RPCB_getaddrres_sz,
|
|
.p_statidx = RPCBPROC_GETADDR,
|
|
.p_timer = 0,
|
|
.p_name = "GETADDR",
|
|
},
|
|
};
|
|
|
|
static struct rpc_procinfo rpcb_procedures4[] = {
|
|
[RPCBPROC_SET] = {
|
|
.p_proc = RPCBPROC_SET,
|
|
.p_encode = (kxdreproc_t)rpcb_enc_getaddr,
|
|
.p_decode = (kxdrdproc_t)rpcb_dec_set,
|
|
.p_arglen = RPCB_getaddrargs_sz,
|
|
.p_replen = RPCB_setres_sz,
|
|
.p_statidx = RPCBPROC_SET,
|
|
.p_timer = 0,
|
|
.p_name = "SET",
|
|
},
|
|
[RPCBPROC_UNSET] = {
|
|
.p_proc = RPCBPROC_UNSET,
|
|
.p_encode = (kxdreproc_t)rpcb_enc_getaddr,
|
|
.p_decode = (kxdrdproc_t)rpcb_dec_set,
|
|
.p_arglen = RPCB_getaddrargs_sz,
|
|
.p_replen = RPCB_setres_sz,
|
|
.p_statidx = RPCBPROC_UNSET,
|
|
.p_timer = 0,
|
|
.p_name = "UNSET",
|
|
},
|
|
[RPCBPROC_GETADDR] = {
|
|
.p_proc = RPCBPROC_GETADDR,
|
|
.p_encode = (kxdreproc_t)rpcb_enc_getaddr,
|
|
.p_decode = (kxdrdproc_t)rpcb_dec_getaddr,
|
|
.p_arglen = RPCB_getaddrargs_sz,
|
|
.p_replen = RPCB_getaddrres_sz,
|
|
.p_statidx = RPCBPROC_GETADDR,
|
|
.p_timer = 0,
|
|
.p_name = "GETADDR",
|
|
},
|
|
};
|
|
|
|
static const struct rpcb_info rpcb_next_version[] = {
|
|
{
|
|
.rpc_vers = RPCBVERS_2,
|
|
.rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT],
|
|
},
|
|
{
|
|
.rpc_proc = NULL,
|
|
},
|
|
};
|
|
|
|
static const 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 const struct rpc_version rpcb_version2 = {
|
|
.number = RPCBVERS_2,
|
|
.nrprocs = ARRAY_SIZE(rpcb_procedures2),
|
|
.procs = rpcb_procedures2
|
|
};
|
|
|
|
static const struct rpc_version rpcb_version3 = {
|
|
.number = RPCBVERS_3,
|
|
.nrprocs = ARRAY_SIZE(rpcb_procedures3),
|
|
.procs = rpcb_procedures3
|
|
};
|
|
|
|
static const struct rpc_version rpcb_version4 = {
|
|
.number = RPCBVERS_4,
|
|
.nrprocs = ARRAY_SIZE(rpcb_procedures4),
|
|
.procs = rpcb_procedures4
|
|
};
|
|
|
|
static const struct rpc_version *rpcb_version[] = {
|
|
NULL,
|
|
NULL,
|
|
&rpcb_version2,
|
|
&rpcb_version3,
|
|
&rpcb_version4
|
|
};
|
|
|
|
static struct rpc_stat rpcb_stats;
|
|
|
|
static const struct rpc_program rpcb_program = {
|
|
.name = "rpcbind",
|
|
.number = RPCBIND_PROGRAM,
|
|
.nrvers = ARRAY_SIZE(rpcb_version),
|
|
.version = rpcb_version,
|
|
.stats = &rpcb_stats,
|
|
};
|