[mirror_ubuntu-bionic-kernel.git] / net / sunrpc / rpcb_clnt.c

/*
 * 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)

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_addr
 *
 * Quoting RFC 3530, section 2.2:
 *
 * For TCP over IPv4 and for UDP over IPv4, the format of r_addr is the
 * US-ASCII string:
 *
 *	h1.h2.h3.h4.p1.p2
 *
 * The prefix, "h1.h2.h3.h4", is the standard textual form for
 * representing an IPv4 address, which is always four octets long.
 * Assuming big-endian ordering, h1, h2, h3, and h4, are respectively,
 * the first through fourth octets each converted to ASCII-decimal.
 * Assuming big-endian ordering, p1 and p2 are, respectively, the first
 * and second octets each converted to ASCII-decimal.  For example, if a
 * host, in big-endian order, has an address of 0x0A010307 and there is
 * a service listening on, in big endian order, port 0x020F (decimal
 * 527), then the complete universal address is "10.1.3.7.2.15".
 *
 * ...
 *
 * For TCP over IPv6 and for UDP over IPv6, the format of r_addr is the
 * US-ASCII string:
 *
 *	x1:x2:x3:x4:x5:x6:x7:x8.p1.p2
 *
 * The suffix "p1.p2" is the service port, and is computed the same way
 * as with universal addresses for TCP and UDP over IPv4.  The prefix,
 * "x1:x2:x3:x4:x5:x6:x7:x8", is the standard textual form for
 * representing an IPv6 address as defined in Section 2.2 of [RFC2373].
 * Additionally, the two alternative forms specified in Section 2.2 of
 * [RFC2373] are also acceptable.
 *
 * XXX: Currently this implementation does not explicitly convert the
 *      stored address to US-ASCII on non-ASCII systems.
 */
#define RPCB_MAXADDRLEN		(128u)

/*
 * 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 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;
	char *			r_netid;
	char			r_addr[RPCB_MAXADDRLEN];
	char *			r_owner;
};

static struct rpc_procinfo rpcb_procedures2[];
static struct rpc_procinfo rpcb_procedures3[];

struct rpcb_info {
	int			rpc_vers;
	struct rpc_procinfo *	rpc_proc;
};

static struct rpcb_info rpcb_next_version[];
static struct rpcb_info rpcb_next_version6[];

static void rpcb_map_release(void *data)
{
	struct rpcbind_args *map = data;

	xprt_put(map->r_xprt);
	kfree(map);
}

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 struct rpc_clnt *rpcb_create(char *hostname, struct sockaddr *srvaddr,
					int proto, int version, int privileged)
{
	struct rpc_create_args args = {
		.protocol	= proto,
		.address	= srvaddr,
		.addrsize	= sizeof(struct sockaddr_in),
		.servername	= hostname,
		.program	= &rpcb_program,
		.version	= version,
		.authflavor	= RPC_AUTH_UNIX,
		.flags		= (RPC_CLNT_CREATE_NOPING |
				   RPC_CLNT_CREATE_INTR),
	};

	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;
	}

	if (!privileged)
		args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
	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 sockaddr_in sin = {
		.sin_family		= AF_INET,
		.sin_addr.s_addr	= htonl(INADDR_LOOPBACK),
	};
	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("localhost", (struct sockaddr *) &sin,
					XPRT_TRANSPORT_UDP, 2, 1);
	if (IS_ERR(rpcb_clnt))
		return PTR_ERR(rpcb_clnt);

	error = rpc_call_sync(rpcb_clnt, &msg, 0);

	rpc_shutdown_client(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
 *
 * Called from outside the RPC client in a synchronous task context.
 * Uses default timeout parameters specified by underlying transport.
 *
 * XXX: Needs to support IPv6, and rpcbind versions 3 and 4
 */
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;
	char hostname[40];
	int status;

	dprintk("RPC:       %s(" NIPQUAD_FMT ", %u, %u, %d)\n",
		__FUNCTION__, NIPQUAD(sin->sin_addr.s_addr), prog, vers, prot);

	sprintf(hostname, NIPQUAD_FMT, NIPQUAD(sin->sin_addr.s_addr));
	rpcb_clnt = rpcb_create(hostname, (struct sockaddr *)sin, prot, 2, 0);
	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, int version)
{
	struct rpc_message msg = {
		.rpc_proc = rpcb_next_version[version].rpc_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;
	int 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 addr;
	int status;
	struct rpcb_info *info;

	dprintk("RPC: %5u %s(%s, %u, %u, %d)\n",
		task->tk_pid, __FUNCTION__,
		clnt->cl_server, clnt->cl_prog, clnt->cl_vers, xprt->prot);

	/* Autobind on cloned rpc clients is discouraged */
	BUG_ON(clnt->cl_parent != clnt);

	if (xprt_test_and_set_binding(xprt)) {
		status = -EAGAIN;	/* tell caller to check again */
		dprintk("RPC: %5u %s: waiting for another binder\n",
			task->tk_pid, __FUNCTION__);
		goto bailout_nowake;
	}

	/* Put self on queue before sending rpcbind request, in case
	 * rpcb_getport_done completes before we return from rpc_run_task */
	rpc_sleep_on(&xprt->binding, task, NULL, NULL);

	/* Someone else may have bound if we slept */
	if (xprt_bound(xprt)) {
		status = 0;
		dprintk("RPC: %5u %s: already bound\n",
			task->tk_pid, __FUNCTION__);
		goto bailout_nofree;
	}

	rpc_peeraddr(clnt, (void *)&addr, sizeof(addr));

	/* Don't ever use rpcbind v2 for AF_INET6 requests */
	switch (addr.sa_family) {
	case AF_INET:
		info = rpcb_next_version;
		break;
	case AF_INET6:
		info = rpcb_next_version6;
		break;
	default:
		status = -EAFNOSUPPORT;
		dprintk("RPC: %5u %s: bad address family\n",
				task->tk_pid, __FUNCTION__);
		goto bailout_nofree;
	}
	if (info[xprt->bind_index].rpc_proc == NULL) {
		xprt->bind_index = 0;
		status = -EPFNOSUPPORT;
		dprintk("RPC: %5u %s: no more getport versions available\n",
			task->tk_pid, __FUNCTION__);
		goto bailout_nofree;
	}
	bind_version = info[xprt->bind_index].rpc_vers;

	dprintk("RPC: %5u %s: trying rpcbind version %u\n",
		task->tk_pid, __FUNCTION__, bind_version);

	rpcb_clnt = rpcb_create(clnt->cl_server, &addr, xprt->prot,
				bind_version, 0);
	if (IS_ERR(rpcb_clnt)) {
		status = PTR_ERR(rpcb_clnt);
		dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n",
			task->tk_pid, __FUNCTION__, 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, __FUNCTION__);
		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);
	memcpy(map->r_addr,
	       rpc_peeraddr2str(rpcb_clnt, RPC_DISPLAY_UNIVERSAL_ADDR),
	       sizeof(map->r_addr));
	map->r_owner = RPCB_OWNER_STRING;	/* ignored for GETADDR */

	child = rpcb_call_async(rpcb_clnt, map, xprt->bind_index);
	rpc_release_client(rpcb_clnt);
	if (IS_ERR(child)) {
		status = -EIO;
		dprintk("RPC: %5u %s: rpc_run_task failed\n",
			task->tk_pid, __FUNCTION__);
		goto bailout;
	}
	rpc_put_task(child);

	task->tk_xprt->stat.bind_count++;
	return;

bailout:
	kfree(map);
	xprt_put(xprt);
bailout_nofree:
	rpcb_wake_rpcbind_waiters(xprt, status);
bailout_nowake:
	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);

	rpcb_wake_rpcbind_waiters(xprt, status);
}

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 result %u\n",
			*boolp);
	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 > RPCB_MAXADDRLEN)
		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(RPCB_MAXADDRLEN))
#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(GETADDR,		mapping,	getport),
};

static struct rpc_procinfo rpcb_procedures3[] = {
	PROC(SET,		mapping,	set),
	PROC(UNSET,		mapping,	set),
	PROC(GETADDR,		getaddr,	getaddr),
};

static struct rpc_procinfo rpcb_procedures4[] = {
	PROC(SET,		mapping,	set),
	PROC(UNSET,		mapping,	set),
	PROC(GETVERSADDR,	getaddr,	getaddr),
};

static struct rpcb_info rpcb_next_version[] = {
#ifdef CONFIG_SUNRPC_BIND34
	{ 4, &rpcb_procedures4[RPCBPROC_GETVERSADDR] },
	{ 3, &rpcb_procedures3[RPCBPROC_GETADDR] },
#endif
	{ 2, &rpcb_procedures2[RPCBPROC_GETPORT] },
	{ 0, NULL },
};

static struct rpcb_info rpcb_next_version6[] = {
#ifdef CONFIG_SUNRPC_BIND34
	{ 4, &rpcb_procedures4[RPCBPROC_GETVERSADDR] },
	{ 3, &rpcb_procedures3[RPCBPROC_GETADDR] },
#endif
	{ 0, NULL },
};

static struct rpc_version rpcb_version2 = {
	.number		= 2,
	.nrprocs	= RPCB_HIGHPROC_2,
	.procs		= rpcb_procedures2
};

static struct rpc_version rpcb_version3 = {
	.number		= 3,
	.nrprocs	= RPCB_HIGHPROC_3,
	.procs		= rpcb_procedures3
};

static struct rpc_version rpcb_version4 = {
	.number		= 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,
};
Commit	Line	Data
a509050b CL	1	/*
	2	* In-kernel rpcbind client supporting versions 2, 3, and 4 of the rpcbind
	3	* protocol
	4	*
	5	* Based on RFC 1833: "Binding Protocols for ONC RPC Version 2" and
	6	* RFC 3530: "Network File System (NFS) version 4 Protocol"
	7	*
	8	* Original: Gilles Quillard, Bull Open Source, 2005 <gilles.quillard@bull.net>
	9	* Updated: Chuck Lever, Oracle Corporation, 2007 <chuck.lever@oracle.com>
	10	*
	11	* Descended from net/sunrpc/pmap_clnt.c,
	12	* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
	13	*/
	14
cce63cd6 CL	15	#include <linux/module.h>
cce63cd6 CL	16
a509050b CL	17	#include <linux/types.h>
a509050b CL	18	#include <linux/socket.h>
d5b64430 CL	19	#include <linux/in.h>
d5b64430 CL	20	#include <linux/in6.h>
a509050b CL	21	#include <linux/kernel.h>
	22	#include <linux/errno.h>
	23
	24	#include <linux/sunrpc/clnt.h>
	25	#include <linux/sunrpc/sched.h>
0896a725	26	#include <linux/sunrpc/xprtsock.h>
a509050b CL	27
	28	#ifdef RPC_DEBUG
	29	# define RPCDBG_FACILITY RPCDBG_BIND
	30	#endif
	31
	32	#define RPCBIND_PROGRAM (100000u)
	33	#define RPCBIND_PORT (111u)
	34
	35	enum {
	36	RPCBPROC_NULL,
	37	RPCBPROC_SET,
	38	RPCBPROC_UNSET,
	39	RPCBPROC_GETPORT,
	40	RPCBPROC_GETADDR = 3, /* alias for GETPORT */
	41	RPCBPROC_DUMP,
	42	RPCBPROC_CALLIT,
	43	RPCBPROC_BCAST = 5, /* alias for CALLIT */
	44	RPCBPROC_GETTIME,
	45	RPCBPROC_UADDR2TADDR,
	46	RPCBPROC_TADDR2UADDR,
	47	RPCBPROC_GETVERSADDR,
	48	RPCBPROC_INDIRECT,
	49	RPCBPROC_GETADDRLIST,
	50	RPCBPROC_GETSTAT,
	51	};
	52
	53	#define RPCB_HIGHPROC_2 RPCBPROC_CALLIT
	54	#define RPCB_HIGHPROC_3 RPCBPROC_TADDR2UADDR
	55	#define RPCB_HIGHPROC_4 RPCBPROC_GETSTAT
	56
	57	/*
	58	* r_addr
	59	*
	60	* Quoting RFC 3530, section 2.2:
	61	*
	62	* For TCP over IPv4 and for UDP over IPv4, the format of r_addr is the
	63	* US-ASCII string:
	64	*
	65	* h1.h2.h3.h4.p1.p2
	66	*
	67	* The prefix, "h1.h2.h3.h4", is the standard textual form for
	68	* representing an IPv4 address, which is always four octets long.
	69	* Assuming big-endian ordering, h1, h2, h3, and h4, are respectively,
	70	* the first through fourth octets each converted to ASCII-decimal.
	71	* Assuming big-endian ordering, p1 and p2 are, respectively, the first
	72	* and second octets each converted to ASCII-decimal. For example, if a
	73	* host, in big-endian order, has an address of 0x0A010307 and there is
	74	* a service listening on, in big endian order, port 0x020F (decimal
	75	* 527), then the complete universal address is "10.1.3.7.2.15".
	76	*
	77	* ...
	78	*
	79	* For TCP over IPv6 and for UDP over IPv6, the format of r_addr is the
	80	* US-ASCII string:
	81	*
	82	* x1:x2:x3:x4:x5:x6:x7:x8.p1.p2
	83	*
	84	* The suffix "p1.p2" is the service port, and is computed the same way
	85	* as with universal addresses for TCP and UDP over IPv4. The prefix,
	86	* "x1:x2:x3:x4:x5:x6:x7:x8", is the standard textual form for
	87	* representing an IPv6 address as defined in Section 2.2 of [RFC2373].
	88	* Additionally, the two alternative forms specified in Section 2.2 of
	89	* [RFC2373] are also acceptable.
	90	*
91	* XXX: Currently this implementation does not explicitly convert the
92	* stored address to US-ASCII on non-ASCII systems.
93	*/
94	#define RPCB_MAXADDRLEN (128u)
95
a509050b CL	96	/*
	97	* r_owner
	98	*
	99	* The "owner" is allowed to unset a service in the rpcbind database.
	100	* We always use the following (arbitrary) fixed string.
	101	*/
	102	#define RPCB_OWNER_STRING "rpcb"
	103	#define RPCB_MAXOWNERLEN sizeof(RPCB_OWNER_STRING)
	104
	105	static void rpcb_getport_done(struct rpc_task , void );
7f4adeff	106	static struct rpc_program rpcb_program;
a509050b CL	107
	108	struct rpcbind_args {
	109	struct rpc_xprt * r_xprt;
	110
	111	u32 r_prog;
	112	u32 r_vers;
	113	u32 r_prot;
	114	unsigned short r_port;
	115	char * r_netid;
	116	char r_addr[RPCB_MAXADDRLEN];
	117	char * r_owner;
	118	};
	119
	120	static struct rpc_procinfo rpcb_procedures2[];
	121	static struct rpc_procinfo rpcb_procedures3[];
	122
d5b64430	123	struct rpcb_info {
a509050b CL	124	int rpc_vers;
a509050b CL	125	struct rpc_procinfo * rpc_proc;
d5b64430 CL	126	};
	127
	128	static struct rpcb_info rpcb_next_version[];
	129	static struct rpcb_info rpcb_next_version6[];
a509050b	130
a509050b CL	131	static void rpcb_map_release(void *data)
	132	{
	133	struct rpcbind_args *map = data;
	134
	135	xprt_put(map->r_xprt);
	136	kfree(map);
	137	}
	138
	139	static const struct rpc_call_ops rpcb_getport_ops = {
a509050b CL	140	.rpc_call_done = rpcb_getport_done,
	141	.rpc_release = rpcb_map_release,
	142	};
	143
	144	static void rpcb_wake_rpcbind_waiters(struct rpc_xprt *xprt, int status)
	145	{
	146	xprt_clear_binding(xprt);
	147	rpc_wake_up_status(&xprt->binding, status);
	148	}
	149
	150	static struct rpc_clnt rpcb_create(char hostname, struct sockaddr *srvaddr,
	151	int proto, int version, int privileged)
	152	{
	153	struct rpc_create_args args = {
	154	.protocol = proto,
	155	.address = srvaddr,
	156	.addrsize = sizeof(struct sockaddr_in),
	157	.servername = hostname,
	158	.program = &rpcb_program,
	159	.version = version,
	160	.authflavor = RPC_AUTH_UNIX,
f7fb558e CL	161	.flags = (RPC_CLNT_CREATE_NOPING \|
f7fb558e CL	162	RPC_CLNT_CREATE_INTR),
a509050b CL	163	};
a509050b CL	164
d5b64430 CL	165	switch (srvaddr->sa_family) {
	166	case AF_INET:
	167	((struct sockaddr_in *)srvaddr)->sin_port = htons(RPCBIND_PORT);
	168	break;
	169	case AF_INET6:
	170	((struct sockaddr_in6 *)srvaddr)->sin6_port = htons(RPCBIND_PORT);
	171	break;
	172	default:
	173	return NULL;
	174	}
	175
a509050b CL	176	if (!privileged)
	177	args.flags \|= RPC_CLNT_CREATE_NONPRIVPORT;
	178	return rpc_create(&args);
	179	}
	180
	181	/**
	182	* rpcb_register - set or unset a port registration with the local rpcbind svc
	183	* @prog: RPC program number to bind
	184	* @vers: RPC version number to bind
	185	* @prot: transport protocol to use to make this request
	186	* @port: port value to register
	187	* @okay: result code
	188	*
	189	* port == 0 means unregister, port != 0 means register.
	190	*
	191	* This routine supports only rpcbind version 2.
	192	*/
	193	int rpcb_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay)
	194	{
	195	struct sockaddr_in sin = {
	196	.sin_family = AF_INET,
	197	.sin_addr.s_addr = htonl(INADDR_LOOPBACK),
	198	};
	199	struct rpcbind_args map = {
	200	.r_prog = prog,
	201	.r_vers = vers,
	202	.r_prot = prot,
	203	.r_port = port,
	204	};
	205	struct rpc_message msg = {
	206	.rpc_proc = &rpcb_procedures2[port ?
	207	RPCBPROC_SET : RPCBPROC_UNSET],
	208	.rpc_argp = &map,
	209	.rpc_resp = okay,
	210	};
	211	struct rpc_clnt *rpcb_clnt;
	212	int error = 0;
	213
	214	dprintk("RPC: %sregistering (%u, %u, %d, %u) with local "
	215	"rpcbind\n", (port ? "" : "un"),
	216	prog, vers, prot, port);
	217
	218	rpcb_clnt = rpcb_create("localhost", (struct sockaddr *) &sin,
0896a725	219	XPRT_TRANSPORT_UDP, 2, 1);
a509050b CL	220	if (IS_ERR(rpcb_clnt))
	221	return PTR_ERR(rpcb_clnt);
	222
	223	error = rpc_call_sync(rpcb_clnt, &msg, 0);
	224
90c5755f	225	rpc_shutdown_client(rpcb_clnt);
a509050b CL	226	if (error < 0)
	227	printk(KERN_WARNING "RPC: failed to contact local rpcbind "
	228	"server (errno %d).\n", -error);
	229	dprintk("RPC: registration status %d/%d\n", error, *okay);
	230
	231	return error;
	232	}
	233
a509050b	234	/**
cce63cd6	235	* rpcb_getport_sync - obtain the port for an RPC service on a given host
a509050b CL	236	* @sin: address of remote peer
	237	* @prog: RPC program number to bind
	238	* @vers: RPC version number to bind
	239	* @prot: transport protocol to use to make this request
	240	*
	241	* Called from outside the RPC client in a synchronous task context.
cce63cd6	242	* Uses default timeout parameters specified by underlying transport.
a509050b	243	*
cce63cd6	244	* XXX: Needs to support IPv6, and rpcbind versions 3 and 4
a509050b	245	*/
cce63cd6 CL	246	int rpcb_getport_sync(struct sockaddr_in *sin, __u32 prog,
cce63cd6 CL	247	__u32 vers, int prot)
a509050b CL	248	{
	249	struct rpcbind_args map = {
	250	.r_prog = prog,
	251	.r_vers = vers,
	252	.r_prot = prot,
	253	.r_port = 0,
	254	};
	255	struct rpc_message msg = {
	256	.rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT],
	257	.rpc_argp = &map,
	258	.rpc_resp = &map.r_port,
	259	};
	260	struct rpc_clnt *rpcb_clnt;
	261	char hostname[40];
	262	int status;
	263
cce63cd6 CL	264	dprintk("RPC: %s(" NIPQUAD_FMT ", %u, %u, %d)\n",
cce63cd6 CL	265	__FUNCTION__, NIPQUAD(sin->sin_addr.s_addr), prog, vers, prot);
a509050b	266
cce63cd6	267	sprintf(hostname, NIPQUAD_FMT, NIPQUAD(sin->sin_addr.s_addr));
a509050b CL	268	rpcb_clnt = rpcb_create(hostname, (struct sockaddr *)sin, prot, 2, 0);
	269	if (IS_ERR(rpcb_clnt))
	270	return PTR_ERR(rpcb_clnt);
	271
	272	status = rpc_call_sync(rpcb_clnt, &msg, 0);
90c5755f	273	rpc_shutdown_client(rpcb_clnt);
a509050b CL	274
	275	if (status >= 0) {
	276	if (map.r_port != 0)
	277	return map.r_port;
	278	status = -EACCES;
	279	}
	280	return status;
	281	}
cce63cd6	282	EXPORT_SYMBOL_GPL(rpcb_getport_sync);
a509050b	283
5138fde0 TM	284	static struct rpc_task rpcb_call_async(struct rpc_clnt rpcb_clnt, struct rpcbind_args *map, int version)
	285	{
	286	struct rpc_message msg = {
	287	.rpc_proc = rpcb_next_version[version].rpc_proc,
	288	.rpc_argp = map,
	289	.rpc_resp = &map->r_port,
	290	};
	291	struct rpc_task_setup task_setup_data = {
	292	.rpc_client = rpcb_clnt,
	293	.rpc_message = &msg,
	294	.callback_ops = &rpcb_getport_ops,
	295	.callback_data = map,
	296	.flags = RPC_TASK_ASYNC,
	297	};
	298
	299	return rpc_run_task(&task_setup_data);
	300	}
	301
a509050b	302	/**
45160d62	303	* rpcb_getport_async - obtain the port for a given RPC service on a given host
a509050b CL	304	* @task: task that is waiting for portmapper request
	305	*
	306	* This one can be called for an ongoing RPC request, and can be used in
	307	* an async (rpciod) context.
	308	*/
45160d62	309	void rpcb_getport_async(struct rpc_task *task)
a509050b CL	310	{
	311	struct rpc_clnt *clnt = task->tk_client;
	312	int bind_version;
	313	struct rpc_xprt *xprt = task->tk_xprt;
	314	struct rpc_clnt *rpcb_clnt;
	315	static struct rpcbind_args *map;
	316	struct rpc_task *child;
	317	struct sockaddr addr;
	318	int status;
d5b64430	319	struct rpcb_info *info;
a509050b	320
45160d62 CL	321	dprintk("RPC: %5u %s(%s, %u, %u, %d)\n",
	322	task->tk_pid, __FUNCTION__,
	323	clnt->cl_server, clnt->cl_prog, clnt->cl_vers, xprt->prot);
a509050b CL	324
	325	/* Autobind on cloned rpc clients is discouraged */
	326	BUG_ON(clnt->cl_parent != clnt);
	327
	328	if (xprt_test_and_set_binding(xprt)) {
2429cbf6	329	status = -EAGAIN; /* tell caller to check again */
45160d62 CL	330	dprintk("RPC: %5u %s: waiting for another binder\n",
45160d62 CL	331	task->tk_pid, __FUNCTION__);
a509050b CL	332	goto bailout_nowake;
	333	}
	334
	335	/* Put self on queue before sending rpcbind request, in case
	336	* rpcb_getport_done completes before we return from rpc_run_task */
	337	rpc_sleep_on(&xprt->binding, task, NULL, NULL);
	338
	339	/* Someone else may have bound if we slept */
	340	if (xprt_bound(xprt)) {
	341	status = 0;
45160d62 CL	342	dprintk("RPC: %5u %s: already bound\n",
45160d62 CL	343	task->tk_pid, __FUNCTION__);
a509050b CL	344	goto bailout_nofree;
	345	}
	346
d5b64430 CL	347	rpc_peeraddr(clnt, (void *)&addr, sizeof(addr));
	348
	349	/* Don't ever use rpcbind v2 for AF_INET6 requests */
	350	switch (addr.sa_family) {
	351	case AF_INET:
	352	info = rpcb_next_version;
	353	break;
	354	case AF_INET6:
	355	info = rpcb_next_version6;
	356	break;
	357	default:
	358	status = -EAFNOSUPPORT;
	359	dprintk("RPC: %5u %s: bad address family\n",
	360	task->tk_pid, __FUNCTION__);
	361	goto bailout_nofree;
	362	}
	363	if (info[xprt->bind_index].rpc_proc == NULL) {
a509050b	364	xprt->bind_index = 0;
906462af	365	status = -EPFNOSUPPORT;
45160d62 CL	366	dprintk("RPC: %5u %s: no more getport versions available\n",
45160d62 CL	367	task->tk_pid, __FUNCTION__);
a509050b CL	368	goto bailout_nofree;
a509050b CL	369	}
d5b64430	370	bind_version = info[xprt->bind_index].rpc_vers;
a509050b	371
45160d62 CL	372	dprintk("RPC: %5u %s: trying rpcbind version %u\n",
45160d62 CL	373	task->tk_pid, __FUNCTION__, bind_version);
a509050b	374
143b6c40 CL	375	rpcb_clnt = rpcb_create(clnt->cl_server, &addr, xprt->prot,
	376	bind_version, 0);
	377	if (IS_ERR(rpcb_clnt)) {
	378	status = PTR_ERR(rpcb_clnt);
	379	dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n",
	380	task->tk_pid, __FUNCTION__, PTR_ERR(rpcb_clnt));
	381	goto bailout_nofree;
	382	}
	383
a509050b CL	384	map = kzalloc(sizeof(struct rpcbind_args), GFP_ATOMIC);
	385	if (!map) {
	386	status = -ENOMEM;
45160d62 CL	387	dprintk("RPC: %5u %s: no memory available\n",
45160d62 CL	388	task->tk_pid, __FUNCTION__);
a509050b CL	389	goto bailout_nofree;
	390	}
	391	map->r_prog = clnt->cl_prog;
	392	map->r_vers = clnt->cl_vers;
	393	map->r_prot = xprt->prot;
	394	map->r_port = 0;
	395	map->r_xprt = xprt_get(xprt);
4417c8c4	396	map->r_netid = rpc_peeraddr2str(clnt, RPC_DISPLAY_NETID);
6d0aa06a	397	memcpy(map->r_addr,
143b6c40 CL	398	rpc_peeraddr2str(rpcb_clnt, RPC_DISPLAY_UNIVERSAL_ADDR),
143b6c40 CL	399	sizeof(map->r_addr));
a509050b CL	400	map->r_owner = RPCB_OWNER_STRING; /* ignored for GETADDR */
a509050b CL	401
5138fde0	402	child = rpcb_call_async(rpcb_clnt, map, xprt->bind_index);
4c402b40	403	rpc_release_client(rpcb_clnt);
a509050b CL	404	if (IS_ERR(child)) {
a509050b CL	405	status = -EIO;
45160d62 CL	406	dprintk("RPC: %5u %s: rpc_run_task failed\n",
45160d62 CL	407	task->tk_pid, __FUNCTION__);
143b6c40	408	goto bailout;
a509050b CL	409	}
	410	rpc_put_task(child);
	411
	412	task->tk_xprt->stat.bind_count++;
	413	return;
	414
	415	bailout:
	416	kfree(map);
	417	xprt_put(xprt);
	418	bailout_nofree:
	419	rpcb_wake_rpcbind_waiters(xprt, status);
	420	bailout_nowake:
	421	task->tk_status = status;
	422	}
12444809	423	EXPORT_SYMBOL_GPL(rpcb_getport_async);
a509050b CL	424
	425	/*
	426	* Rpcbind child task calls this callback via tk_exit.
	427	*/
	428	static void rpcb_getport_done(struct rpc_task child, void data)
	429	{
	430	struct rpcbind_args *map = data;
	431	struct rpc_xprt *xprt = map->r_xprt;
	432	int status = child->tk_status;
	433
4784cb51 CL	434	/* Garbage reply: retry with a lesser rpcbind version */
	435	if (status == -EIO)
	436	status = -EPROTONOSUPPORT;
	437
a509050b CL	438	/* rpcbind server doesn't support this rpcbind protocol version */
	439	if (status == -EPROTONOSUPPORT)
	440	xprt->bind_index++;
	441
	442	if (status < 0) {
	443	/* rpcbind server not available on remote host? */
	444	xprt->ops->set_port(xprt, 0);
	445	} else if (map->r_port == 0) {
	446	/* Requested RPC service wasn't registered on remote host */
	447	xprt->ops->set_port(xprt, 0);
	448	status = -EACCES;
	449	} else {
	450	/* Succeeded */
	451	xprt->ops->set_port(xprt, map->r_port);
	452	xprt_set_bound(xprt);
	453	status = 0;
	454	}
	455
	456	dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n",
	457	child->tk_pid, status, map->r_port);
	458
	459	rpcb_wake_rpcbind_waiters(xprt, status);
	460	}
	461
	462	static int rpcb_encode_mapping(struct rpc_rqst req, __be32 p,
	463	struct rpcbind_args *rpcb)
	464	{
	465	dprintk("RPC: rpcb_encode_mapping(%u, %u, %d, %u)\n",
	466	rpcb->r_prog, rpcb->r_vers, rpcb->r_prot, rpcb->r_port);
	467	*p++ = htonl(rpcb->r_prog);
	468	*p++ = htonl(rpcb->r_vers);
	469	*p++ = htonl(rpcb->r_prot);
	470	*p++ = htonl(rpcb->r_port);
	471
	472	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
	473	return 0;
	474	}
	475
	476	static int rpcb_decode_getport(struct rpc_rqst req, __be32 p,
	477	unsigned short *portp)
	478	{
	479	portp = (unsigned short) ntohl(p++);
	480	dprintk("RPC: rpcb_decode_getport result %u\n",
	481	*portp);
	482	return 0;
	483	}
	484
	485	static int rpcb_decode_set(struct rpc_rqst req, __be32 p,
	486	unsigned int *boolp)
	487	{
	488	boolp = (unsigned int) ntohl(p++);
	489	dprintk("RPC: rpcb_decode_set result %u\n",
	490	*boolp);
	491	return 0;
	492	}
	493
	494	static int rpcb_encode_getaddr(struct rpc_rqst req, __be32 p,
	495	struct rpcbind_args *rpcb)
	496	{
	497	dprintk("RPC: rpcb_encode_getaddr(%u, %u, %s)\n",
	498	rpcb->r_prog, rpcb->r_vers, rpcb->r_addr);
	499	*p++ = htonl(rpcb->r_prog);
	500	*p++ = htonl(rpcb->r_vers);
	501
502	p = xdr_encode_string(p, rpcb->r_netid);
503	p = xdr_encode_string(p, rpcb->r_addr);
504	p = xdr_encode_string(p, rpcb->r_owner);
505
506	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
507
508	return 0;
509	}
510
511	static int rpcb_decode_getaddr(struct rpc_rqst req, __be32 p,
512	unsigned short *portp)
513	{
514	char *addr;
adc24df8 CL	515	u32 addr_len;
adc24df8 CL	516	int c, i, f, first, val;
a509050b CL	517
a509050b CL	518	*portp = 0;
adc24df8	519	addr_len = ntohl(*p++);
a509050b	520
e65fe397 CL	521	/*
	522	* Simple sanity check. The smallest possible universal
	523	* address is an IPv4 address string containing 11 bytes.
	524	*/
	525	if (addr_len < 11 \|\| addr_len > RPCB_MAXADDRLEN)
	526	goto out_err;
	527
	528	/*
	529	* Start at the end and walk backwards until the first dot
	530	* is encountered. When the second dot is found, we have
	531	* both parts of the port number.
	532	*/
a509050b CL	533	addr = (char *)p;
	534	val = 0;
	535	first = 1;
	536	f = 1;
	537	for (i = addr_len - 1; i > 0; i--) {
	538	c = addr[i];
	539	if (c >= '0' && c <= '9') {
	540	val += (c - '0') * f;
	541	f *= 10;
	542	} else if (c == '.') {
	543	if (first) {
	544	*portp = val;
	545	val = first = 0;
	546	f = 1;
	547	} else {
	548	*portp \|= (val << 8);
	549	break;
	550	}
	551	}
	552	}
	553
e65fe397 CL	554	/*
	555	* Simple sanity check. If we never saw a dot in the reply,
	556	* then this was probably just garbage.
	557	*/
	558	if (first)
	559	goto out_err;
	560
a509050b CL	561	dprintk("RPC: rpcb_decode_getaddr port=%u\n", *portp);
a509050b CL	562	return 0;
e65fe397 CL	563
	564	out_err:
	565	dprintk("RPC: rpcbind server returned malformed reply\n");
	566	return -EIO;
a509050b CL	567	}
	568
	569	#define RPCB_program_sz (1u)
	570	#define RPCB_version_sz (1u)
	571	#define RPCB_protocol_sz (1u)
	572	#define RPCB_port_sz (1u)
	573	#define RPCB_boolean_sz (1u)
	574
4f40ee4a	575	#define RPCB_netid_sz (1+XDR_QUADLEN(RPCBIND_MAXNETIDLEN))
a509050b CL	576	#define RPCB_addr_sz (1+XDR_QUADLEN(RPCB_MAXADDRLEN))
	577	#define RPCB_ownerstring_sz (1+XDR_QUADLEN(RPCB_MAXOWNERLEN))
	578
	579	#define RPCB_mappingargs_sz RPCB_program_sz+RPCB_version_sz+ \
	580	RPCB_protocol_sz+RPCB_port_sz
	581	#define RPCB_getaddrargs_sz RPCB_program_sz+RPCB_version_sz+ \
	582	RPCB_netid_sz+RPCB_addr_sz+ \
	583	RPCB_ownerstring_sz
	584
	585	#define RPCB_setres_sz RPCB_boolean_sz
	586	#define RPCB_getportres_sz RPCB_port_sz
	587
	588	/*
	589	* Note that RFC 1833 does not put any size restrictions on the
	590	* address string returned by the remote rpcbind database.
	591	*/
	592	#define RPCB_getaddrres_sz RPCB_addr_sz
	593
	594	#define PROC(proc, argtype, restype) \
	595	[RPCBPROC_##proc] = { \
	596	.p_proc = RPCBPROC_##proc, \
	597	.p_encode = (kxdrproc_t) rpcb_encode_##argtype, \
	598	.p_decode = (kxdrproc_t) rpcb_decode_##restype, \
	599	.p_arglen = RPCB_##argtype##args_sz, \
	600	.p_replen = RPCB_##restype##res_sz, \
	601	.p_statidx = RPCBPROC_##proc, \
	602	.p_timer = 0, \
	603	.p_name = #proc, \
	604	}
	605
	606	/*
	607	* Not all rpcbind procedures described in RFC 1833 are implemented
	608	* since the Linux kernel RPC code requires only these.
	609	*/
	610	static struct rpc_procinfo rpcb_procedures2[] = {
	611	PROC(SET, mapping, set),
	612	PROC(UNSET, mapping, set),
	613	PROC(GETADDR, mapping, getport),
	614	};
	615
	616	static struct rpc_procinfo rpcb_procedures3[] = {
	617	PROC(SET, mapping, set),
	618	PROC(UNSET, mapping, set),
	619	PROC(GETADDR, getaddr, getaddr),
	620	};
	621
	622	static struct rpc_procinfo rpcb_procedures4[] = {
	623	PROC(SET, mapping, set),
	624	PROC(UNSET, mapping, set),
	625	PROC(GETVERSADDR, getaddr, getaddr),
	626	};
	627
	628	static struct rpcb_info rpcb_next_version[] = {
	629	#ifdef CONFIG_SUNRPC_BIND34
	630	{ 4, &rpcb_procedures4[RPCBPROC_GETVERSADDR] },
	631	{ 3, &rpcb_procedures3[RPCBPROC_GETADDR] },
	632	#endif
	633	{ 2, &rpcb_procedures2[RPCBPROC_GETPORT] },
	634	{ 0, NULL },
	635	};
	636
d5b64430 CL	637	static struct rpcb_info rpcb_next_version6[] = {
	638	#ifdef CONFIG_SUNRPC_BIND34
	639	{ 4, &rpcb_procedures4[RPCBPROC_GETVERSADDR] },
	640	{ 3, &rpcb_procedures3[RPCBPROC_GETADDR] },
	641	#endif
	642	{ 0, NULL },
	643	};
	644
a509050b CL	645	static struct rpc_version rpcb_version2 = {
	646	.number = 2,
	647	.nrprocs = RPCB_HIGHPROC_2,
	648	.procs = rpcb_procedures2
	649	};
	650
	651	static struct rpc_version rpcb_version3 = {
	652	.number = 3,
	653	.nrprocs = RPCB_HIGHPROC_3,
	654	.procs = rpcb_procedures3
	655	};
	656
	657	static struct rpc_version rpcb_version4 = {
	658	.number = 4,
	659	.nrprocs = RPCB_HIGHPROC_4,
	660	.procs = rpcb_procedures4
	661	};
	662
	663	static struct rpc_version *rpcb_version[] = {
	664	NULL,
	665	NULL,
	666	&rpcb_version2,
	667	&rpcb_version3,
	668	&rpcb_version4
	669	};
	670
	671	static struct rpc_stat rpcb_stats;
	672
7f4adeff	673	static struct rpc_program rpcb_program = {
a509050b CL	674	.name = "rpcbind",
	675	.number = RPCBIND_PROGRAM,
	676	.nrvers = ARRAY_SIZE(rpcb_version),
	677	.version = rpcb_version,
	678	.stats = &rpcb_stats,
	679	};