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1094 lines
28 KiB
1094 lines
28 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
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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 <[email protected]> |
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* Updated: Chuck Lever, Oracle Corporation, 2007 <[email protected]> |
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* |
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* Descended from net/sunrpc/pmap_clnt.c, |
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* Copyright (C) 1996, Olaf Kirch <[email protected]> |
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*/ |
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|
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#include <linux/module.h> |
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|
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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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|
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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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|
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#include <trace/events/sunrpc.h> |
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|
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#include "netns.h" |
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|
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#define RPCBIND_SOCK_PATHNAME "/var/run/rpcbind.sock" |
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|
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#define RPCBIND_PROGRAM (100000u) |
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#define RPCBIND_PORT (111u) |
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|
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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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|
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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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/* |
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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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/* |
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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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|
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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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/* |
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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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|
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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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/* |
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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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|
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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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|
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struct rpcbind_args { |
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struct rpc_xprt * r_xprt; |
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|
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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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|
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int r_status; |
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}; |
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|
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static const struct rpc_procinfo rpcb_procedures2[]; |
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static const struct rpc_procinfo rpcb_procedures3[]; |
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static const struct rpc_procinfo rpcb_procedures4[]; |
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|
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struct rpcb_info { |
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u32 rpc_vers; |
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const struct rpc_procinfo *rpc_proc; |
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}; |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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return cnt; |
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} |
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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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|
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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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|
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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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|
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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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|
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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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} |
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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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.cred = current_cred(), |
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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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/* |
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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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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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clnt4 = NULL; |
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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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/* |
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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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.cred = current_cred(), |
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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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|
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clnt = rpc_create(&args); |
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if (IS_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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/* |
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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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clnt4 = NULL; |
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rpcb_set_local(net, clnt, clnt4, false); |
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|
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out: |
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return result; |
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} |
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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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|
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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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|
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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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const struct cred *cred, |
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const struct rpc_timeout *timeo) |
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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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.timeout = timeo, |
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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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.cred = cred, |
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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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|
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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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|
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error = rpc_call_sync(clnt, msg, flags); |
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if (error < 0) |
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return error; |
|
|
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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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* 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 |
|
* 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). |
|
* |
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* 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, transport] |
|
* tuple they wish to advertise. |
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* |
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* Callers may also unregister RPC services that are no longer |
|
* available by setting the passed-in port to zero. This removes |
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* all registered transports for [program, version] from the local |
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* rpcbind database. |
|
* |
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* This function uses rpcbind protocol version 2 to contact the |
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* local rpcbind daemon. |
|
* |
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* Registration works over both AF_INET and AF_INET6, and services |
|
* registered via this function are advertised as available for any |
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* address. If the local rpcbind daemon is listening on AF_INET6, |
|
* services registered via this function will be advertised on |
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* 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) |
|
{ |
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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_argp = &map, |
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}; |
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struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
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bool is_set = false; |
|
|
|
trace_pmap_register(prog, vers, prot, port); |
|
|
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msg.rpc_proc = &rpcb_procedures2[RPCBPROC_UNSET]; |
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if (port != 0) { |
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msg.rpc_proc = &rpcb_procedures2[RPCBPROC_SET]; |
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is_set = true; |
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} |
|
|
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return rpcb_register_call(sn, sn->rpcb_local_clnt, &msg, is_set); |
|
} |
|
|
|
/* |
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* Fill in AF_INET family-specific arguments to register |
|
*/ |
|
static int rpcb_register_inet4(struct sunrpc_net *sn, |
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const struct sockaddr *sap, |
|
struct rpc_message *msg) |
|
{ |
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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; |
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int result; |
|
|
|
map->r_addr = rpc_sockaddr2uaddr(sap, GFP_KERNEL); |
|
|
|
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); |
|
|
|
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; |
|
|
|
trace_rpcb_unregister(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); |
|
|
|
trace_rpcb_register(map.r_prog, map.r_vers, map.r_addr, map.r_netid); |
|
|
|
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, const 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; |
|
const 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); |
|
|
|
/* 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_timeout(&xprt->binding, task, |
|
NULL, jiffies + xprt->bind_timeout); |
|
|
|
if (xprt_test_and_set_binding(xprt)) { |
|
xprt_put(xprt); |
|
return; |
|
} |
|
|
|
/* Someone else may have bound if we slept */ |
|
if (xprt_bound(xprt)) { |
|
status = 0; |
|
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; |
|
goto bailout_nofree; |
|
} |
|
if (proc == NULL) { |
|
xprt->bind_index = 0; |
|
status = -EPFNOSUPPORT; |
|
goto bailout_nofree; |
|
} |
|
|
|
trace_rpcb_getport(clnt, task, bind_version); |
|
|
|
rpcb_clnt = rpcb_create(xprt->xprt_net, |
|
clnt->cl_nodename, |
|
xprt->servername, sap, salen, |
|
xprt->prot, bind_version, |
|
clnt->cl_cred, |
|
task->tk_client->cl_timeout); |
|
if (IS_ERR(rpcb_clnt)) { |
|
status = PTR_ERR(rpcb_clnt); |
|
goto bailout_nofree; |
|
} |
|
|
|
map = kzalloc(sizeof(struct rpcbind_args), GFP_NOFS); |
|
if (!map) { |
|
status = -ENOMEM; |
|
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_NOFS); |
|
if (!map->r_addr) { |
|
status = -ENOMEM; |
|
goto bailout_free_args; |
|
} |
|
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); |
|
|
|
xprt->stat.bind_count++; |
|
rpc_put_task(child); |
|
return; |
|
|
|
bailout_free_args: |
|
kfree(map); |
|
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; |
|
|
|
map->r_status = child->tk_status; |
|
|
|
/* Garbage reply: retry with a lesser rpcbind version */ |
|
if (map->r_status == -EIO) |
|
map->r_status = -EPROTONOSUPPORT; |
|
|
|
/* rpcbind server doesn't support this rpcbind protocol version */ |
|
if (map->r_status == -EPROTONOSUPPORT) |
|
xprt->bind_index++; |
|
|
|
if (map->r_status < 0) { |
|
/* rpcbind server not available on remote host? */ |
|
map->r_port = 0; |
|
|
|
} else if (map->r_port == 0) { |
|
/* Requested RPC service wasn't registered on remote host */ |
|
map->r_status = -EACCES; |
|
} else { |
|
/* Succeeded */ |
|
map->r_status = 0; |
|
} |
|
|
|
trace_rpcb_setport(child, map->r_status, map->r_port); |
|
xprt->ops->set_port(xprt, map->r_port); |
|
if (map->r_port) |
|
xprt_set_bound(xprt); |
|
} |
|
|
|
/* |
|
* XDR functions for rpcbind |
|
*/ |
|
|
|
static void rpcb_enc_mapping(struct rpc_rqst *req, struct xdr_stream *xdr, |
|
const void *data) |
|
{ |
|
const struct rpcbind_args *rpcb = data; |
|
__be32 *p; |
|
|
|
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, |
|
void *data) |
|
{ |
|
struct rpcbind_args *rpcb = data; |
|
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); |
|
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, |
|
void *data) |
|
{ |
|
unsigned int *boolp = data; |
|
__be32 *p; |
|
|
|
p = xdr_inline_decode(xdr, 4); |
|
if (unlikely(p == NULL)) |
|
return -EIO; |
|
|
|
*boolp = 0; |
|
if (*p != xdr_zero) |
|
*boolp = 1; |
|
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 void *data) |
|
{ |
|
const struct rpcbind_args *rpcb = data; |
|
__be32 *p; |
|
|
|
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, |
|
void *data) |
|
{ |
|
struct rpcbind_args *rpcb = data; |
|
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) |
|
return 0; |
|
|
|
if (unlikely(len > RPCBIND_MAXUADDRLEN)) |
|
goto out_fail; |
|
|
|
p = xdr_inline_decode(xdr, len); |
|
if (unlikely(p == NULL)) |
|
goto out_fail; |
|
|
|
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: |
|
return -EIO; |
|
} |
|
|
|
/* |
|
* Not all rpcbind procedures described in RFC 1833 are implemented |
|
* since the Linux kernel RPC code requires only these. |
|
*/ |
|
|
|
static const struct rpc_procinfo rpcb_procedures2[] = { |
|
[RPCBPROC_SET] = { |
|
.p_proc = RPCBPROC_SET, |
|
.p_encode = rpcb_enc_mapping, |
|
.p_decode = 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 = rpcb_enc_mapping, |
|
.p_decode = 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 = rpcb_enc_mapping, |
|
.p_decode = rpcb_dec_getport, |
|
.p_arglen = RPCB_mappingargs_sz, |
|
.p_replen = RPCB_getportres_sz, |
|
.p_statidx = RPCBPROC_GETPORT, |
|
.p_timer = 0, |
|
.p_name = "GETPORT", |
|
}, |
|
}; |
|
|
|
static const struct rpc_procinfo rpcb_procedures3[] = { |
|
[RPCBPROC_SET] = { |
|
.p_proc = RPCBPROC_SET, |
|
.p_encode = rpcb_enc_getaddr, |
|
.p_decode = 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 = rpcb_enc_getaddr, |
|
.p_decode = 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 = rpcb_enc_getaddr, |
|
.p_decode = 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 rpc_procinfo rpcb_procedures4[] = { |
|
[RPCBPROC_SET] = { |
|
.p_proc = RPCBPROC_SET, |
|
.p_encode = rpcb_enc_getaddr, |
|
.p_decode = 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 = rpcb_enc_getaddr, |
|
.p_decode = 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 = rpcb_enc_getaddr, |
|
.p_decode = 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 unsigned int rpcb_version2_counts[ARRAY_SIZE(rpcb_procedures2)]; |
|
static const struct rpc_version rpcb_version2 = { |
|
.number = RPCBVERS_2, |
|
.nrprocs = ARRAY_SIZE(rpcb_procedures2), |
|
.procs = rpcb_procedures2, |
|
.counts = rpcb_version2_counts, |
|
}; |
|
|
|
static unsigned int rpcb_version3_counts[ARRAY_SIZE(rpcb_procedures3)]; |
|
static const struct rpc_version rpcb_version3 = { |
|
.number = RPCBVERS_3, |
|
.nrprocs = ARRAY_SIZE(rpcb_procedures3), |
|
.procs = rpcb_procedures3, |
|
.counts = rpcb_version3_counts, |
|
}; |
|
|
|
static unsigned int rpcb_version4_counts[ARRAY_SIZE(rpcb_procedures4)]; |
|
static const struct rpc_version rpcb_version4 = { |
|
.number = RPCBVERS_4, |
|
.nrprocs = ARRAY_SIZE(rpcb_procedures4), |
|
.procs = rpcb_procedures4, |
|
.counts = rpcb_version4_counts, |
|
}; |
|
|
|
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, |
|
};
|
|
|