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 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * In-kernel rpcbind client supporting versions 2, 3, and 4 of the rpcbind
  * protocol
  *
  * Based on RFC 1833: "Binding Protocols for ONC RPC Version 2" and
  * RFC 3530: "Network File System (NFS) version 4 Protocol"
  *
  * Original: Gilles Quillard, Bull Open Source, 2005 <gilles.quillard@bull.net>
  * Updated: Chuck Lever, Oracle Corporation, 2007 <chuck.lever@oracle.com>
  *
  * Descended from net/sunrpc/pmap_clnt.c,
  *  Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
  */
 
 #include <linux/module.h>
 
 #include <linux/types.h>
 #include <linux/socket.h>
 #include <linux/un.h>
 #include <linux/in.h>
 #include <linux/in6.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/mutex.h>
 #include <linux/slab.h>
 #include <net/ipv6.h>
 
 #include <linux/sunrpc/clnt.h>
 #include <linux/sunrpc/addr.h>
 #include <linux/sunrpc/sched.h>
 #include <linux/sunrpc/xprtsock.h>
 
 #include <trace/events/sunrpc.h>
 
 #include "netns.h"
 
 #define RPCBIND_SOCK_PATHNAME   "/var/run/rpcbind.sock"
 
 #define RPCBIND_PROGRAM     (100000u)
 #define RPCBIND_PORT        (111u)
 
 #define RPCBVERS_2      (2u)
 #define RPCBVERS_3      (3u)
 #define RPCBVERS_4      (4u)
 
 enum {
     RPCBPROC_NULL,
     RPCBPROC_SET,
     RPCBPROC_UNSET,
     RPCBPROC_GETPORT,
     RPCBPROC_GETADDR = 3,       /* alias for GETPORT */
     RPCBPROC_DUMP,
     RPCBPROC_CALLIT,
     RPCBPROC_BCAST = 5,     /* alias for CALLIT */
     RPCBPROC_GETTIME,
     RPCBPROC_UADDR2TADDR,
     RPCBPROC_TADDR2UADDR,
     RPCBPROC_GETVERSADDR,
     RPCBPROC_INDIRECT,
     RPCBPROC_GETADDRLIST,
     RPCBPROC_GETSTAT,
 };
 
 /*
  * r_owner
  *
  * The "owner" is allowed to unset a service in the rpcbind database.
  *
  * For AF_LOCAL SET/UNSET requests, rpcbind treats this string as a
  * UID which it maps to a local user name via a password lookup.
  * In all other cases it is ignored.
  *
  * For SET/UNSET requests, user space provides a value, even for
  * network requests, and GETADDR uses an empty string.  We follow
  * those precedents here.
  */
 #define RPCB_OWNER_STRING   "0"
 #define RPCB_MAXOWNERLEN    sizeof(RPCB_OWNER_STRING)
 
 /*
  * XDR data type sizes
  */
 #define RPCB_program_sz     (1)
 #define RPCB_version_sz     (1)
 #define RPCB_protocol_sz    (1)
 #define RPCB_port_sz        (1)
 #define RPCB_boolean_sz     (1)
 
 #define RPCB_netid_sz       (1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN))
 #define RPCB_addr_sz        (1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN))
 #define RPCB_ownerstring_sz (1 + XDR_QUADLEN(RPCB_MAXOWNERLEN))
 
 /*
  * XDR argument and result sizes
  */
 #define RPCB_mappingargs_sz (RPCB_program_sz + RPCB_version_sz + \
                 RPCB_protocol_sz + RPCB_port_sz)
 #define RPCB_getaddrargs_sz (RPCB_program_sz + RPCB_version_sz + \
                 RPCB_netid_sz + RPCB_addr_sz + \
                 RPCB_ownerstring_sz)
 
 #define RPCB_getportres_sz  RPCB_port_sz
 #define RPCB_setres_sz      RPCB_boolean_sz
 
 /*
  * Note that RFC 1833 does not put any size restrictions on the
  * address string returned by the remote rpcbind database.
  */
 #define RPCB_getaddrres_sz  RPCB_addr_sz
 
 static void         rpcb_getport_done(struct rpc_task *, void *);
 static void         rpcb_map_release(void *data);
 static const struct rpc_program rpcb_program;
 
 struct rpcbind_args {
     struct rpc_xprt *   r_xprt;
 
     u32         r_prog;
     u32         r_vers;
     u32         r_prot;
     unsigned short      r_port;
     const char *        r_netid;
     const char *        r_addr;
     const char *        r_owner;
 
     int         r_status;
 };
 
 static const struct rpc_procinfo rpcb_procedures2[];
 static const struct rpc_procinfo rpcb_procedures3[];
 static const struct rpc_procinfo rpcb_procedures4[];
 
 struct rpcb_info {
     u32         rpc_vers;
     const struct rpc_procinfo *rpc_proc;
 };
 
 static const struct rpcb_info rpcb_next_version[];
 static const struct rpcb_info rpcb_next_version6[];
 
 static const struct rpc_call_ops rpcb_getport_ops = {
     .rpc_call_done      = rpcb_getport_done,
     .rpc_release        = rpcb_map_release,
 };
 
 static void rpcb_wake_rpcbind_waiters(struct rpc_xprt *xprt, int status)
 {
     xprt_clear_binding(xprt);
     rpc_wake_up_status(&xprt->binding, status);
 }
 
 static void rpcb_map_release(void *data)
 {
     struct rpcbind_args *map = data;
 
     rpcb_wake_rpcbind_waiters(map->r_xprt, map->r_status);
     xprt_put(map->r_xprt);
     kfree(map->r_addr);
     kfree(map);
 }
 
 static int rpcb_get_local(struct net *net)
 {
     int cnt;
     struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
 
     spin_lock(&sn->rpcb_clnt_lock);
     if (sn->rpcb_users)
         sn->rpcb_users++;
     cnt = sn->rpcb_users;
     spin_unlock(&sn->rpcb_clnt_lock);
 
     return cnt;
 }
 
 void rpcb_put_local(struct net *net)
 {
     struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
     struct rpc_clnt *clnt = sn->rpcb_local_clnt;
     struct rpc_clnt *clnt4 = sn->rpcb_local_clnt4;
     int shutdown = 0;
 
     spin_lock(&sn->rpcb_clnt_lock);
     if (sn->rpcb_users) {
         if (--sn->rpcb_users == 0) {
             sn->rpcb_local_clnt = NULL;
             sn->rpcb_local_clnt4 = NULL;
         }
         shutdown = !sn->rpcb_users;
     }
     spin_unlock(&sn->rpcb_clnt_lock);
 
     if (shutdown) {
         /*
          * cleanup_rpcb_clnt - remove xprtsock's sysctls, unregister
          */
         if (clnt4)
             rpc_shutdown_client(clnt4);
         if (clnt)
             rpc_shutdown_client(clnt);
     }
 }
 
 static void rpcb_set_local(struct net *net, struct rpc_clnt *clnt,
             struct rpc_clnt *clnt4,
             bool is_af_local)
 {
     struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
 
     /* Protected by rpcb_create_local_mutex */
     sn->rpcb_local_clnt = clnt;
     sn->rpcb_local_clnt4 = clnt4;
     sn->rpcb_is_af_local = is_af_local ? 1 : 0;
     smp_wmb();
     sn->rpcb_users = 1;
 }
 
 /*
  * Returns zero on success, otherwise a negative errno value
  * is returned.
  */
 static int rpcb_create_local_unix(struct net *net)
 {
     static const struct sockaddr_un rpcb_localaddr_rpcbind = {
         .sun_family     = AF_LOCAL,
         .sun_path       = RPCBIND_SOCK_PATHNAME,
     };
     struct rpc_create_args args = {
         .net        = net,
         .protocol   = XPRT_TRANSPORT_LOCAL,
         .address    = (struct sockaddr *)&rpcb_localaddr_rpcbind,
         .addrsize   = sizeof(rpcb_localaddr_rpcbind),
         .servername = "localhost",
         .program    = &rpcb_program,
         .version    = RPCBVERS_2,
         .authflavor = RPC_AUTH_NULL,
         .cred       = current_cred(),
         /*
          * We turn off the idle timeout to prevent the kernel
          * from automatically disconnecting the socket.
          * Otherwise, we'd have to cache the mount namespace
          * of the caller and somehow pass that to the socket
          * reconnect code.
          */
         .flags      = RPC_CLNT_CREATE_NO_IDLE_TIMEOUT,
     };
     struct rpc_clnt *clnt, *clnt4;
     int result = 0;
 
     /*
      * Because we requested an RPC PING at transport creation time,
      * this works only if the user space portmapper is rpcbind, and
      * it's listening on AF_LOCAL on the named socket.
      */
     clnt = rpc_create(&args);
     if (IS_ERR(clnt)) {
         result = PTR_ERR(clnt);
         goto out;
     }
 
     clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4);
     if (IS_ERR(clnt4))
         clnt4 = NULL;
 
     rpcb_set_local(net, clnt, clnt4, true);
 
 out:
     return result;
 }
 
 /*
  * Returns zero on success, otherwise a negative errno value
  * is returned.
  */
 static int rpcb_create_local_net(struct net *net)
 {
     static const struct sockaddr_in rpcb_inaddr_loopback = {
         .sin_family     = AF_INET,
         .sin_addr.s_addr    = htonl(INADDR_LOOPBACK),
         .sin_port       = htons(RPCBIND_PORT),
     };
     struct rpc_create_args args = {
         .net        = net,
         .protocol   = XPRT_TRANSPORT_TCP,
         .address    = (struct sockaddr *)&rpcb_inaddr_loopback,
         .addrsize   = sizeof(rpcb_inaddr_loopback),
         .servername = "localhost",
         .program    = &rpcb_program,
         .version    = RPCBVERS_2,
         .authflavor = RPC_AUTH_UNIX,
         .cred       = current_cred(),
         .flags      = RPC_CLNT_CREATE_NOPING,
     };
     struct rpc_clnt *clnt, *clnt4;
     int result = 0;
 
     clnt = rpc_create(&args);
     if (IS_ERR(clnt)) {
         result = PTR_ERR(clnt);
         goto out;
     }
 
     /*
      * This results in an RPC ping.  On systems running portmapper,
      * the v4 ping will fail.  Proceed anyway, but disallow rpcb
      * v4 upcalls.
      */
     clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4);
     if (IS_ERR(clnt4))
         clnt4 = NULL;
 
     rpcb_set_local(net, clnt, clnt4, false);
 
 out:
     return result;
 }
 
 /*
  * Returns zero on success, otherwise a negative errno value
  * is returned.
  */
 int rpcb_create_local(struct net *net)
 {
     static DEFINE_MUTEX(rpcb_create_local_mutex);
     int result = 0;
 
     if (rpcb_get_local(net))
         return result;
 
     mutex_lock(&rpcb_create_local_mutex);
     if (rpcb_get_local(net))
         goto out;
 
     if (rpcb_create_local_unix(net) != 0)
         result = rpcb_create_local_net(net);
 
 out:
     mutex_unlock(&rpcb_create_local_mutex);
     return result;
 }
 
 static struct rpc_clnt *rpcb_create(struct net *net, const char *nodename,
                     const char *hostname,
                     struct sockaddr *srvaddr, size_t salen,
                     int proto, u32 version,
                     const struct cred *cred,
                     const struct rpc_timeout *timeo)
 {
     struct rpc_create_args args = {
         .net        = net,
         .protocol   = proto,
         .address    = srvaddr,
         .addrsize   = salen,
         .timeout    = timeo,
         .servername = hostname,
         .nodename   = nodename,
         .program    = &rpcb_program,
         .version    = version,
         .authflavor = RPC_AUTH_UNIX,
         .cred       = cred,
         .flags      = (RPC_CLNT_CREATE_NOPING |
                     RPC_CLNT_CREATE_NONPRIVPORT),
     };
 
     switch (srvaddr->sa_family) {
     case AF_INET:
         ((struct sockaddr_in *)srvaddr)->sin_port = htons(RPCBIND_PORT);
         break;
     case AF_INET6:
         ((struct sockaddr_in6 *)srvaddr)->sin6_port = htons(RPCBIND_PORT);
         break;
     default:
         return ERR_PTR(-EAFNOSUPPORT);
     }
 
     return rpc_create(&args);
 }
 
 static int rpcb_register_call(struct sunrpc_net *sn, struct rpc_clnt *clnt, struct rpc_message *msg, bool is_set)
 {
     int flags = RPC_TASK_NOCONNECT;
     int error, result = 0;
 
     if (is_set || !sn->rpcb_is_af_local)
         flags = RPC_TASK_SOFTCONN;
     msg->rpc_resp = &result;
 
     error = rpc_call_sync(clnt, msg, flags);
     if (error < 0)
         return error;
 
     if (!result)
         return -EACCES;
     return 0;
 }
 
 /**
  * rpcb_register - set or unset a port registration with the local rpcbind svc
  * @net: target network namespace
  * @prog: RPC program number to bind
  * @vers: RPC version number to bind
  * @prot: transport protocol to register
  * @port: port value to 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, 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.
  *
  * Registration works over both AF_INET and AF_INET6, and services
  * registered via this function are advertised as available for any
  * address.  If the local rpcbind daemon is listening on AF_INET6,
  * services registered via this function will be advertised on
  * IN6ADDR_ANY (ie available for all AF_INET and AF_INET6
  * addresses).
  */
 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;
 
     trace_pmap_register(prog, vers, prot, port);
 
     msg.rpc_proc = &rpcb_procedures2[RPCBPROC_UNSET];
     if (port != 0) {
         msg.rpc_proc = &rpcb_procedures2[RPCBPROC_SET];
         is_set = true;
     }
 
     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);
 
     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), rpc_task_gfp_mask());
     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, rpc_task_gfp_mask());
         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,
 };

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