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OpenCloudOS-Kernel/net/sunrpc/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/in.h>
#include <linux/in6.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/sched.h>
#include <linux/sunrpc/xprtsock.h>
#ifdef RPC_DEBUG
# define RPCDBG_FACILITY RPCDBG_BIND
#endif
#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,
};
#define RPCB_HIGHPROC_2 RPCBPROC_CALLIT
#define RPCB_HIGHPROC_3 RPCBPROC_TADDR2UADDR
#define RPCB_HIGHPROC_4 RPCBPROC_GETSTAT
/*
* r_owner
*
* The "owner" is allowed to unset a service in the rpcbind database.
* We always use the following (arbitrary) fixed string.
*/
#define RPCB_OWNER_STRING "rpcb"
#define RPCB_MAXOWNERLEN sizeof(RPCB_OWNER_STRING)
static void rpcb_getport_done(struct rpc_task *, void *);
static void rpcb_map_release(void *data);
static 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[];
struct rpcb_info {
u32 rpc_vers;
struct rpc_procinfo * rpc_proc;
};
static struct rpcb_info rpcb_next_version[];
static 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);
}
static const struct sockaddr_in rpcb_inaddr_loopback = {
.sin_family = AF_INET,
.sin_addr.s_addr = htonl(INADDR_LOOPBACK),
.sin_port = htons(RPCBIND_PORT),
};
static struct rpc_clnt *rpcb_create_local(struct sockaddr *addr,
size_t addrlen, u32 version)
{
struct rpc_create_args args = {
.protocol = XPRT_TRANSPORT_UDP,
.address = addr,
.addrsize = addrlen,
.servername = "localhost",
.program = &rpcb_program,
.version = version,
.authflavor = RPC_AUTH_UNIX,
.flags = RPC_CLNT_CREATE_NOPING,
};
return rpc_create(&args);
}
static struct rpc_clnt *rpcb_create(char *hostname, struct sockaddr *srvaddr,
size_t salen, int proto, u32 version)
{
struct rpc_create_args args = {
.protocol = proto,
.address = srvaddr,
.addrsize = salen,
.servername = hostname,
.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 NULL;
}
return rpc_create(&args);
}
/**
* rpcb_register - set or unset a port registration with the local rpcbind svc
* @prog: RPC program number to bind
* @vers: RPC version number to bind
* @prot: transport protocol to use to make this request
* @port: port value to register
* @okay: result code
*
* port == 0 means unregister, port != 0 means register.
*
* This routine supports only rpcbind version 2.
*/
int rpcb_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay)
{
struct rpcbind_args map = {
.r_prog = prog,
.r_vers = vers,
.r_prot = prot,
.r_port = port,
};
struct rpc_message msg = {
.rpc_proc = &rpcb_procedures2[port ?
RPCBPROC_SET : RPCBPROC_UNSET],
.rpc_argp = &map,
.rpc_resp = okay,
};
struct rpc_clnt *rpcb_clnt;
int error = 0;
dprintk("RPC: %sregistering (%u, %u, %d, %u) with local "
"rpcbind\n", (port ? "" : "un"),
prog, vers, prot, port);
rpcb_clnt = rpcb_create_local((struct sockaddr *)&rpcb_inaddr_loopback,
sizeof(rpcb_inaddr_loopback),
RPCBVERS_2);
if (!IS_ERR(rpcb_clnt)) {
error = rpc_call_sync(rpcb_clnt, &msg, 0);
rpc_shutdown_client(rpcb_clnt);
} else
error = PTR_ERR(rpcb_clnt);
if (error < 0)
printk(KERN_WARNING "RPC: failed to contact local rpcbind "
"server (errno %d).\n", -error);
dprintk("RPC: registration status %d/%d\n", error, *okay);
return error;
}
/**
* rpcb_getport_sync - obtain the port for an RPC service on a given host
* @sin: address of remote peer
* @prog: RPC program number to bind
* @vers: RPC version number to bind
* @prot: transport protocol to use to make this request
*
* Return value is the requested advertised port number,
* or a negative errno value.
*
* Called from outside the RPC client in a synchronous task context.
* Uses default timeout parameters specified by underlying transport.
*
* XXX: Needs to support IPv6
*/
int rpcb_getport_sync(struct sockaddr_in *sin, u32 prog, u32 vers, int prot)
{
struct rpcbind_args map = {
.r_prog = prog,
.r_vers = vers,
.r_prot = prot,
.r_port = 0,
};
struct rpc_message msg = {
.rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT],
.rpc_argp = &map,
.rpc_resp = &map.r_port,
};
struct rpc_clnt *rpcb_clnt;
int status;
dprintk("RPC: %s(" NIPQUAD_FMT ", %u, %u, %d)\n",
__func__, NIPQUAD(sin->sin_addr.s_addr), prog, vers, prot);
rpcb_clnt = rpcb_create(NULL, (struct sockaddr *)sin,
sizeof(*sin), prot, RPCBVERS_2);
if (IS_ERR(rpcb_clnt))
return PTR_ERR(rpcb_clnt);
status = rpc_call_sync(rpcb_clnt, &msg, 0);
rpc_shutdown_client(rpcb_clnt);
if (status >= 0) {
if (map.r_port != 0)
return map.r_port;
status = -EACCES;
}
return status;
}
EXPORT_SYMBOL_GPL(rpcb_getport_sync);
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->r_port,
};
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,
};
return rpc_run_task(&task_setup_data);
}
/**
* 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 = task->tk_client;
struct rpc_procinfo *proc;
u32 bind_version;
struct rpc_xprt *xprt = task->tk_xprt;
struct rpc_clnt *rpcb_clnt;
static struct rpcbind_args *map;
struct rpc_task *child;
struct sockaddr_storage addr;
struct sockaddr *sap = (struct sockaddr *)&addr;
size_t salen;
int status;
dprintk("RPC: %5u %s(%s, %u, %u, %d)\n",
task->tk_pid, __func__,
clnt->cl_server, clnt->cl_prog, clnt->cl_vers, xprt->prot);
/* Autobind on cloned rpc clients is discouraged */
BUG_ON(clnt->cl_parent != clnt);
/* 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__);
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;
}
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(clnt->cl_server, 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_nofree;
}
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_get(xprt);
map->r_netid = rpc_peeraddr2str(clnt, RPC_DISPLAY_NETID);
map->r_addr = rpc_peeraddr2str(rpcb_clnt, RPC_DISPLAY_UNIVERSAL_ADDR);
map->r_owner = RPCB_OWNER_STRING; /* ignored for GETADDR */
map->r_status = -EIO;
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;
}
rpc_put_task(child);
task->tk_xprt->stat.bind_count++;
return;
bailout_nofree:
rpcb_wake_rpcbind_waiters(xprt, status);
task->tk_status = status;
}
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 int rpcb_encode_mapping(struct rpc_rqst *req, __be32 *p,
struct rpcbind_args *rpcb)
{
dprintk("RPC: rpcb_encode_mapping(%u, %u, %d, %u)\n",
rpcb->r_prog, rpcb->r_vers, rpcb->r_prot, rpcb->r_port);
*p++ = htonl(rpcb->r_prog);
*p++ = htonl(rpcb->r_vers);
*p++ = htonl(rpcb->r_prot);
*p++ = htonl(rpcb->r_port);
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
return 0;
}
static int rpcb_decode_getport(struct rpc_rqst *req, __be32 *p,
unsigned short *portp)
{
*portp = (unsigned short) ntohl(*p++);
dprintk("RPC: rpcb_decode_getport result %u\n",
*portp);
return 0;
}
static int rpcb_decode_set(struct rpc_rqst *req, __be32 *p,
unsigned int *boolp)
{
*boolp = (unsigned int) ntohl(*p++);
dprintk("RPC: rpcb_decode_set: call %s\n",
(*boolp ? "succeeded" : "failed"));
return 0;
}
static int rpcb_encode_getaddr(struct rpc_rqst *req, __be32 *p,
struct rpcbind_args *rpcb)
{
dprintk("RPC: rpcb_encode_getaddr(%u, %u, %s)\n",
rpcb->r_prog, rpcb->r_vers, rpcb->r_addr);
*p++ = htonl(rpcb->r_prog);
*p++ = htonl(rpcb->r_vers);
p = xdr_encode_string(p, rpcb->r_netid);
p = xdr_encode_string(p, rpcb->r_addr);
p = xdr_encode_string(p, rpcb->r_owner);
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
return 0;
}
static int rpcb_decode_getaddr(struct rpc_rqst *req, __be32 *p,
unsigned short *portp)
{
char *addr;
u32 addr_len;
int c, i, f, first, val;
*portp = 0;
addr_len = ntohl(*p++);
/*
* Simple sanity check. The smallest possible universal
* address is an IPv4 address string containing 11 bytes.
*/
if (addr_len < 11 || addr_len > RPCBIND_MAXUADDRLEN)
goto out_err;
/*
* Start at the end and walk backwards until the first dot
* is encountered. When the second dot is found, we have
* both parts of the port number.
*/
addr = (char *)p;
val = 0;
first = 1;
f = 1;
for (i = addr_len - 1; i > 0; i--) {
c = addr[i];
if (c >= '0' && c <= '9') {
val += (c - '0') * f;
f *= 10;
} else if (c == '.') {
if (first) {
*portp = val;
val = first = 0;
f = 1;
} else {
*portp |= (val << 8);
break;
}
}
}
/*
* Simple sanity check. If we never saw a dot in the reply,
* then this was probably just garbage.
*/
if (first)
goto out_err;
dprintk("RPC: rpcb_decode_getaddr port=%u\n", *portp);
return 0;
out_err:
dprintk("RPC: rpcbind server returned malformed reply\n");
return -EIO;
}
#define RPCB_program_sz (1u)
#define RPCB_version_sz (1u)
#define RPCB_protocol_sz (1u)
#define RPCB_port_sz (1u)
#define RPCB_boolean_sz (1u)
#define RPCB_netid_sz (1+XDR_QUADLEN(RPCBIND_MAXNETIDLEN))
#define RPCB_addr_sz (1+XDR_QUADLEN(RPCBIND_MAXUADDRLEN))
#define RPCB_ownerstring_sz (1+XDR_QUADLEN(RPCB_MAXOWNERLEN))
#define RPCB_mappingargs_sz RPCB_program_sz+RPCB_version_sz+ \
RPCB_protocol_sz+RPCB_port_sz
#define RPCB_getaddrargs_sz RPCB_program_sz+RPCB_version_sz+ \
RPCB_netid_sz+RPCB_addr_sz+ \
RPCB_ownerstring_sz
#define RPCB_setres_sz RPCB_boolean_sz
#define RPCB_getportres_sz RPCB_port_sz
/*
* Note that RFC 1833 does not put any size restrictions on the
* address string returned by the remote rpcbind database.
*/
#define RPCB_getaddrres_sz RPCB_addr_sz
#define PROC(proc, argtype, restype) \
[RPCBPROC_##proc] = { \
.p_proc = RPCBPROC_##proc, \
.p_encode = (kxdrproc_t) rpcb_encode_##argtype, \
.p_decode = (kxdrproc_t) rpcb_decode_##restype, \
.p_arglen = RPCB_##argtype##args_sz, \
.p_replen = RPCB_##restype##res_sz, \
.p_statidx = RPCBPROC_##proc, \
.p_timer = 0, \
.p_name = #proc, \
}
/*
* Not all rpcbind procedures described in RFC 1833 are implemented
* since the Linux kernel RPC code requires only these.
*/
static struct rpc_procinfo rpcb_procedures2[] = {
PROC(SET, mapping, set),
PROC(UNSET, mapping, set),
PROC(GETPORT, mapping, getport),
};
static struct rpc_procinfo rpcb_procedures3[] = {
PROC(SET, getaddr, set),
PROC(UNSET, getaddr, set),
PROC(GETADDR, getaddr, getaddr),
};
static struct rpc_procinfo rpcb_procedures4[] = {
PROC(SET, getaddr, set),
PROC(UNSET, getaddr, set),
PROC(GETADDR, getaddr, getaddr),
PROC(GETVERSADDR, getaddr, getaddr),
};
static struct rpcb_info rpcb_next_version[] = {
{
.rpc_vers = RPCBVERS_2,
.rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT],
},
{
.rpc_proc = NULL,
},
};
static struct rpcb_info rpcb_next_version6[] = {
{
.rpc_vers = RPCBVERS_4,
.rpc_proc = &rpcb_procedures4[RPCBPROC_GETADDR],
},
{
.rpc_vers = RPCBVERS_3,
.rpc_proc = &rpcb_procedures3[RPCBPROC_GETADDR],
},
{
.rpc_proc = NULL,
},
};
static struct rpc_version rpcb_version2 = {
.number = RPCBVERS_2,
.nrprocs = RPCB_HIGHPROC_2,
.procs = rpcb_procedures2
};
static struct rpc_version rpcb_version3 = {
.number = RPCBVERS_3,
.nrprocs = RPCB_HIGHPROC_3,
.procs = rpcb_procedures3
};
static struct rpc_version rpcb_version4 = {
.number = RPCBVERS_4,
.nrprocs = RPCB_HIGHPROC_4,
.procs = rpcb_procedures4
};
static struct rpc_version *rpcb_version[] = {
NULL,
NULL,
&rpcb_version2,
&rpcb_version3,
&rpcb_version4
};
static struct rpc_stat rpcb_stats;
static struct rpc_program rpcb_program = {
.name = "rpcbind",
.number = RPCBIND_PROGRAM,
.nrvers = ARRAY_SIZE(rpcb_version),
.version = rpcb_version,
.stats = &rpcb_stats,
};
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