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rpcb_clnt.c
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/*
* 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 "netns.h"
#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
# define RPCDBG_FACILITY RPCDBG_BIND
#endif
#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 struct rpc_procinfo rpcb_procedures2[];
static struct rpc_procinfo rpcb_procedures3[];
static struct rpc_procinfo rpcb_procedures4[];
struct rpcb_info {
u32 rpc_vers;
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;
dprintk("RPC: created new rpcb local clients (rpcb_local_clnt: "
"%p, rpcb_local_clnt4: %p) for net %p%s\n",
sn->rpcb_local_clnt, sn->rpcb_local_clnt4,
net, (net == &init_net) ? " (init_net)" : "");
}
/*
* 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,
/*
* 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)) {
dprintk("RPC: failed to create AF_LOCAL rpcbind "
"client (errno %ld).\n", PTR_ERR(clnt));
result = PTR_ERR(clnt);
goto out;
}
clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4);
if (IS_ERR(clnt4)) {
dprintk("RPC: failed to bind second program to "
"rpcbind v4 client (errno %ld).\n",
PTR_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,
.flags = RPC_CLNT_CREATE_NOPING,
};
struct rpc_clnt *clnt, *clnt4;
int result = 0;
clnt = rpc_create(&args);
if (IS_ERR(clnt)) {
dprintk("RPC: failed to create local rpcbind "
"client (errno %ld).\n", PTR_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)) {
dprintk("RPC: failed to bind second program to "
"rpcbind v4 client (errno %ld).\n",
PTR_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)
{
struct rpc_create_args args = {
.net = net,
.protocol = proto,
.address = srvaddr,
.addrsize = salen,
.servername = hostname,
.nodename = nodename,
.program = &rpcb_program,
.version = version,
.authflavor = RPC_AUTH_UNIX,
.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) {
dprintk("RPC: failed to contact local rpcbind "
"server (errno %d).\n", -error);
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;
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) {
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);
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,