[thirdparty/linux.git] / fs / nfs / mount_clnt.c

// SPDX-License-Identifier: GPL-2.0
/*
 * In-kernel MOUNT protocol client
 *
 * Copyright (C) 1997, Olaf Kirch <okir@monad.swb.de>
 */

#include <linux/types.h>
#include <linux/socket.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/uio.h>
#include <linux/net.h>
#include <linux/in.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/sched.h>
#include <linux/nfs_fs.h>
#include "internal.h"

#define NFSDBG_FACILITY	NFSDBG_MOUNT

/*
 * Defined by RFC 1094, section A.3; and RFC 1813, section 5.1.4
 */
#define MNTPATHLEN		(1024)

/*
 * XDR data type sizes
 */
#define encode_dirpath_sz	(1 + XDR_QUADLEN(MNTPATHLEN))
#define MNT_status_sz		(1)
#define MNT_fhandle_sz		XDR_QUADLEN(NFS2_FHSIZE)
#define MNT_fhandlev3_sz	XDR_QUADLEN(NFS3_FHSIZE)
#define MNT_authflav3_sz	(1 + NFS_MAX_SECFLAVORS)

/*
 * XDR argument and result sizes
 */
#define MNT_enc_dirpath_sz	encode_dirpath_sz
#define MNT_dec_mountres_sz	(MNT_status_sz + MNT_fhandle_sz)
#define MNT_dec_mountres3_sz	(MNT_status_sz + MNT_fhandlev3_sz + \
				 MNT_authflav3_sz)

/*
 * Defined by RFC 1094, section A.5
 */
enum {
	MOUNTPROC_NULL		= 0,
	MOUNTPROC_MNT		= 1,
	MOUNTPROC_DUMP		= 2,
	MOUNTPROC_UMNT		= 3,
	MOUNTPROC_UMNTALL	= 4,
	MOUNTPROC_EXPORT	= 5,
};

/*
 * Defined by RFC 1813, section 5.2
 */
enum {
	MOUNTPROC3_NULL		= 0,
	MOUNTPROC3_MNT		= 1,
	MOUNTPROC3_DUMP		= 2,
	MOUNTPROC3_UMNT		= 3,
	MOUNTPROC3_UMNTALL	= 4,
	MOUNTPROC3_EXPORT	= 5,
};

static const struct rpc_program mnt_program;

/*
 * Defined by OpenGroup XNFS Version 3W, chapter 8
 */
enum mountstat {
	MNT_OK			= 0,
	MNT_EPERM		= 1,
	MNT_ENOENT		= 2,
	MNT_EACCES		= 13,
	MNT_EINVAL		= 22,
};

static struct {
	u32 status;
	int errno;
} mnt_errtbl[] = {
	{ .status = MNT_OK,			.errno = 0,		},
	{ .status = MNT_EPERM,			.errno = -EPERM,	},
	{ .status = MNT_ENOENT,			.errno = -ENOENT,	},
	{ .status = MNT_EACCES,			.errno = -EACCES,	},
	{ .status = MNT_EINVAL,			.errno = -EINVAL,	},
};

/*
 * Defined by RFC 1813, section 5.1.5
 */
enum mountstat3 {
	MNT3_OK			= 0,		/* no error */
	MNT3ERR_PERM		= 1,		/* Not owner */
	MNT3ERR_NOENT		= 2,		/* No such file or directory */
	MNT3ERR_IO		= 5,		/* I/O error */
	MNT3ERR_ACCES		= 13,		/* Permission denied */
	MNT3ERR_NOTDIR		= 20,		/* Not a directory */
	MNT3ERR_INVAL		= 22,		/* Invalid argument */
	MNT3ERR_NAMETOOLONG	= 63,		/* Filename too long */
	MNT3ERR_NOTSUPP		= 10004,	/* Operation not supported */
	MNT3ERR_SERVERFAULT	= 10006,	/* A failure on the server */
};

static struct {
	u32 status;
	int errno;
} mnt3_errtbl[] = {
	{ .status = MNT3_OK,			.errno = 0,		},
	{ .status = MNT3ERR_PERM,		.errno = -EPERM,	},
	{ .status = MNT3ERR_NOENT,		.errno = -ENOENT,	},
	{ .status = MNT3ERR_IO,			.errno = -EIO,		},
	{ .status = MNT3ERR_ACCES,		.errno = -EACCES,	},
	{ .status = MNT3ERR_NOTDIR,		.errno = -ENOTDIR,	},
	{ .status = MNT3ERR_INVAL,		.errno = -EINVAL,	},
	{ .status = MNT3ERR_NAMETOOLONG,	.errno = -ENAMETOOLONG,	},
	{ .status = MNT3ERR_NOTSUPP,		.errno = -ENOTSUPP,	},
	{ .status = MNT3ERR_SERVERFAULT,	.errno = -EREMOTEIO,	},
};

struct mountres {
	int errno;
	struct nfs_fh *fh;
	unsigned int *auth_count;
	rpc_authflavor_t *auth_flavors;
};

struct mnt_fhstatus {
	u32 status;
	struct nfs_fh *fh;
};

/**
 * nfs_mount - Obtain an NFS file handle for the given host and path
 * @info: pointer to mount request arguments
 *
 * Uses default timeout parameters specified by underlying transport. On
 * successful return, the auth_flavs list and auth_flav_len will be populated
 * with the list from the server or a faked-up list if the server didn't
 * provide one.
 */
int nfs_mount(struct nfs_mount_request *info)
{
	struct mountres	result = {
		.fh		= info->fh,
		.auth_count	= info->auth_flav_len,
		.auth_flavors	= info->auth_flavs,
	};
	struct rpc_message msg	= {
		.rpc_argp	= info->dirpath,
		.rpc_resp	= &result,
	};
	struct rpc_create_args args = {
		.net		= info->net,
		.protocol	= info->protocol,
		.address	= info->sap,
		.addrsize	= info->salen,
		.servername	= info->hostname,
		.program	= &mnt_program,
		.version	= info->version,
		.authflavor	= RPC_AUTH_UNIX,
		.cred		= current_cred(),
	};
	struct rpc_clnt		*mnt_clnt;
	int			status;

	dprintk("NFS: sending MNT request for %s:%s\n",
		(info->hostname ? info->hostname : "server"),
			info->dirpath);

	if (strlen(info->dirpath) > MNTPATHLEN)
		return -ENAMETOOLONG;

	if (info->noresvport)
		args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;

	mnt_clnt = rpc_create(&args);
	if (IS_ERR(mnt_clnt))
		goto out_clnt_err;

	if (info->version == NFS_MNT3_VERSION)
		msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC3_MNT];
	else
		msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC_MNT];

	status = rpc_call_sync(mnt_clnt, &msg, RPC_TASK_SOFT|RPC_TASK_TIMEOUT);
	rpc_shutdown_client(mnt_clnt);

	if (status < 0)
		goto out_call_err;
	if (result.errno != 0)
		goto out_mnt_err;

	dprintk("NFS: MNT request succeeded\n");
	status = 0;

	/*
	 * If the server didn't provide a flavor list, allow the
	 * client to try any flavor.
	 */
	if (info->version != NFS_MNT3_VERSION || *info->auth_flav_len == 0) {
		dprintk("NFS: Faking up auth_flavs list\n");
		info->auth_flavs[0] = RPC_AUTH_NULL;
		*info->auth_flav_len = 1;
	}
out:
	return status;

out_clnt_err:
	status = PTR_ERR(mnt_clnt);
	dprintk("NFS: failed to create MNT RPC client, status=%d\n", status);
	goto out;

out_call_err:
	dprintk("NFS: MNT request failed, status=%d\n", status);
	goto out;

out_mnt_err:
	dprintk("NFS: MNT server returned result %d\n", result.errno);
	status = result.errno;
	goto out;
}

/**
 * nfs_umount - Notify a server that we have unmounted this export
 * @info: pointer to umount request arguments
 *
 * MOUNTPROC_UMNT is advisory, so we set a short timeout, and always
 * use UDP.
 */
void nfs_umount(const struct nfs_mount_request *info)
{
	static const struct rpc_timeout nfs_umnt_timeout = {
		.to_initval = 1 * HZ,
		.to_maxval = 3 * HZ,
		.to_retries = 2,
	};
	struct rpc_create_args args = {
		.net		= info->net,
		.protocol	= IPPROTO_UDP,
		.address	= info->sap,
		.addrsize	= info->salen,
		.timeout	= &nfs_umnt_timeout,
		.servername	= info->hostname,
		.program	= &mnt_program,
		.version	= info->version,
		.authflavor	= RPC_AUTH_UNIX,
		.flags		= RPC_CLNT_CREATE_NOPING,
		.cred		= current_cred(),
	};
	struct rpc_message msg	= {
		.rpc_argp	= info->dirpath,
	};
	struct rpc_clnt *clnt;
	int status;

	if (strlen(info->dirpath) > MNTPATHLEN)
		return;

	if (info->noresvport)
		args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;

	clnt = rpc_create(&args);
	if (IS_ERR(clnt))
		goto out_clnt_err;

	dprintk("NFS: sending UMNT request for %s:%s\n",
		(info->hostname ? info->hostname : "server"), info->dirpath);

	if (info->version == NFS_MNT3_VERSION)
		msg.rpc_proc = &clnt->cl_procinfo[MOUNTPROC3_UMNT];
	else
		msg.rpc_proc = &clnt->cl_procinfo[MOUNTPROC_UMNT];

	status = rpc_call_sync(clnt, &msg, 0);
	rpc_shutdown_client(clnt);

	if (unlikely(status < 0))
		goto out_call_err;

	return;

out_clnt_err:
	dprintk("NFS: failed to create UMNT RPC client, status=%ld\n",
			PTR_ERR(clnt));
	return;

out_call_err:
	dprintk("NFS: UMNT request failed, status=%d\n", status);
}

/*
 * XDR encode/decode functions for MOUNT
 */

static void encode_mntdirpath(struct xdr_stream *xdr, const char *pathname)
{
	const u32 pathname_len = strlen(pathname);
	__be32 *p;

	p = xdr_reserve_space(xdr, 4 + pathname_len);
	xdr_encode_opaque(p, pathname, pathname_len);
}

static void mnt_xdr_enc_dirpath(struct rpc_rqst *req, struct xdr_stream *xdr,
				const void *dirpath)
{
	encode_mntdirpath(xdr, dirpath);
}

/*
 * RFC 1094: "A non-zero status indicates some sort of error.  In this
 * case, the status is a UNIX error number."  This can be problematic
 * if the server and client use different errno values for the same
 * error.
 *
 * However, the OpenGroup XNFS spec provides a simple mapping that is
 * independent of local errno values on the server and the client.
 */
static int decode_status(struct xdr_stream *xdr, struct mountres *res)
{
	unsigned int i;
	u32 status;
	__be32 *p;

	p = xdr_inline_decode(xdr, 4);
	if (unlikely(p == NULL))
		return -EIO;
	status = be32_to_cpup(p);

	for (i = 0; i < ARRAY_SIZE(mnt_errtbl); i++) {
		if (mnt_errtbl[i].status == status) {
			res->errno = mnt_errtbl[i].errno;
			return 0;
		}
	}

	dprintk("NFS: unrecognized MNT status code: %u\n", status);
	res->errno = -EACCES;
	return 0;
}

static int decode_fhandle(struct xdr_stream *xdr, struct mountres *res)
{
	struct nfs_fh *fh = res->fh;
	__be32 *p;

	p = xdr_inline_decode(xdr, NFS2_FHSIZE);
	if (unlikely(p == NULL))
		return -EIO;

	fh->size = NFS2_FHSIZE;
	memcpy(fh->data, p, NFS2_FHSIZE);
	return 0;
}

static int mnt_xdr_dec_mountres(struct rpc_rqst *req,
				struct xdr_stream *xdr,
				void *data)
{
	struct mountres *res = data;
	int status;

	status = decode_status(xdr, res);
	if (unlikely(status != 0 || res->errno != 0))
		return status;
	return decode_fhandle(xdr, res);
}

static int decode_fhs_status(struct xdr_stream *xdr, struct mountres *res)
{
	unsigned int i;
	u32 status;
	__be32 *p;

	p = xdr_inline_decode(xdr, 4);
	if (unlikely(p == NULL))
		return -EIO;
	status = be32_to_cpup(p);

	for (i = 0; i < ARRAY_SIZE(mnt3_errtbl); i++) {
		if (mnt3_errtbl[i].status == status) {
			res->errno = mnt3_errtbl[i].errno;
			return 0;
		}
	}

	dprintk("NFS: unrecognized MNT3 status code: %u\n", status);
	res->errno = -EACCES;
	return 0;
}

static int decode_fhandle3(struct xdr_stream *xdr, struct mountres *res)
{
	struct nfs_fh *fh = res->fh;
	u32 size;
	__be32 *p;

	p = xdr_inline_decode(xdr, 4);
	if (unlikely(p == NULL))
		return -EIO;

	size = be32_to_cpup(p);
	if (size > NFS3_FHSIZE || size == 0)
		return -EIO;

	p = xdr_inline_decode(xdr, size);
	if (unlikely(p == NULL))
		return -EIO;

	fh->size = size;
	memcpy(fh->data, p, size);
	return 0;
}

static int decode_auth_flavors(struct xdr_stream *xdr, struct mountres *res)
{
	rpc_authflavor_t *flavors = res->auth_flavors;
	unsigned int *count = res->auth_count;
	u32 entries, i;
	__be32 *p;

	if (*count == 0)
		return 0;

	p = xdr_inline_decode(xdr, 4);
	if (unlikely(p == NULL))
		return -EIO;
	entries = be32_to_cpup(p);
	dprintk("NFS: received %u auth flavors\n", entries);
	if (entries > NFS_MAX_SECFLAVORS)
		entries = NFS_MAX_SECFLAVORS;

	p = xdr_inline_decode(xdr, 4 * entries);
	if (unlikely(p == NULL))
		return -EIO;

	if (entries > *count)
		entries = *count;

	for (i = 0; i < entries; i++) {
		flavors[i] = be32_to_cpup(p++);
		dprintk("NFS:   auth flavor[%u]: %d\n", i, flavors[i]);
	}
	*count = i;

	return 0;
}

static int mnt_xdr_dec_mountres3(struct rpc_rqst *req,
				 struct xdr_stream *xdr,
				 void *data)
{
	struct mountres *res = data;
	int status;

	status = decode_fhs_status(xdr, res);
	if (unlikely(status != 0 || res->errno != 0))
		return status;
	status = decode_fhandle3(xdr, res);
	if (unlikely(status != 0)) {
		res->errno = -EBADHANDLE;
		return 0;
	}
	return decode_auth_flavors(xdr, res);
}

static const struct rpc_procinfo mnt_procedures[] = {
	[MOUNTPROC_MNT] = {
		.p_proc		= MOUNTPROC_MNT,
		.p_encode	= mnt_xdr_enc_dirpath,
		.p_decode	= mnt_xdr_dec_mountres,
		.p_arglen	= MNT_enc_dirpath_sz,
		.p_replen	= MNT_dec_mountres_sz,
		.p_statidx	= MOUNTPROC_MNT,
		.p_name		= "MOUNT",
	},
	[MOUNTPROC_UMNT] = {
		.p_proc		= MOUNTPROC_UMNT,
		.p_encode	= mnt_xdr_enc_dirpath,
		.p_arglen	= MNT_enc_dirpath_sz,
		.p_statidx	= MOUNTPROC_UMNT,
		.p_name		= "UMOUNT",
	},
};

static const struct rpc_procinfo mnt3_procedures[] = {
	[MOUNTPROC3_MNT] = {
		.p_proc		= MOUNTPROC3_MNT,
		.p_encode	= mnt_xdr_enc_dirpath,
		.p_decode	= mnt_xdr_dec_mountres3,
		.p_arglen	= MNT_enc_dirpath_sz,
		.p_replen	= MNT_dec_mountres3_sz,
		.p_statidx	= MOUNTPROC3_MNT,
		.p_name		= "MOUNT",
	},
	[MOUNTPROC3_UMNT] = {
		.p_proc		= MOUNTPROC3_UMNT,
		.p_encode	= mnt_xdr_enc_dirpath,
		.p_arglen	= MNT_enc_dirpath_sz,
		.p_statidx	= MOUNTPROC3_UMNT,
		.p_name		= "UMOUNT",
	},
};

static unsigned int mnt_counts[ARRAY_SIZE(mnt_procedures)];
static const struct rpc_version mnt_version1 = {
	.number		= 1,
	.nrprocs	= ARRAY_SIZE(mnt_procedures),
	.procs		= mnt_procedures,
	.counts		= mnt_counts,
};

static unsigned int mnt3_counts[ARRAY_SIZE(mnt3_procedures)];
static const struct rpc_version mnt_version3 = {
	.number		= 3,
	.nrprocs	= ARRAY_SIZE(mnt3_procedures),
	.procs		= mnt3_procedures,
	.counts		= mnt3_counts,
};

static const struct rpc_version *mnt_version[] = {
	NULL,
	&mnt_version1,
	NULL,
	&mnt_version3,
};

static struct rpc_stat mnt_stats;

static const struct rpc_program mnt_program = {
	.name		= "mount",
	.number		= NFS_MNT_PROGRAM,
	.nrvers		= ARRAY_SIZE(mnt_version),
	.version	= mnt_version,
	.stats		= &mnt_stats,
};
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4	2	/*
19207231	3	* In-kernel MOUNT protocol client
1da177e4 LT	4	*
	5	* Copyright (C) 1997, Olaf Kirch <okir@monad.swb.de>
	6	*/
	7
	8	#include <linux/types.h>
	9	#include <linux/socket.h>
	10	#include <linux/kernel.h>
	11	#include <linux/errno.h>
	12	#include <linux/uio.h>
	13	#include <linux/net.h>
	14	#include <linux/in.h>
	15	#include <linux/sunrpc/clnt.h>
1da177e4 LT	16	#include <linux/sunrpc/sched.h>
1da177e4 LT	17	#include <linux/nfs_fs.h>
8491945f	18	#include "internal.h"
1da177e4	19
39de493e	20	#define NFSDBG_FACILITY NFSDBG_MOUNT
1da177e4	21
29a1bd6b CL	22	/*
	23	* Defined by RFC 1094, section A.3; and RFC 1813, section 5.1.4
	24	*/
	25	#define MNTPATHLEN (1024)
	26
	27	/*
	28	* XDR data type sizes
	29	*/
	30	#define encode_dirpath_sz (1 + XDR_QUADLEN(MNTPATHLEN))
fb125295	31	#define MNT_status_sz (1)
4fdcd996	32	#define MNT_fhandle_sz XDR_QUADLEN(NFS2_FHSIZE)
8eed292b	33	#define MNT_fhandlev3_sz XDR_QUADLEN(NFS3_FHSIZE)
a14017db	34	#define MNT_authflav3_sz (1 + NFS_MAX_SECFLAVORS)
29a1bd6b CL	35
	36	/*
	37	* XDR argument and result sizes
	38	*/
	39	#define MNT_enc_dirpath_sz encode_dirpath_sz
8e02f6b9	40	#define MNT_dec_mountres_sz (MNT_status_sz + MNT_fhandle_sz)
8eed292b	41	#define MNT_dec_mountres3_sz (MNT_status_sz + MNT_fhandlev3_sz + \
8e02f6b9	42	MNT_authflav3_sz)
29a1bd6b	43
2ad78097 CL	44	/*
	45	* Defined by RFC 1094, section A.5
	46	*/
	47	enum {
	48	MOUNTPROC_NULL = 0,
	49	MOUNTPROC_MNT = 1,
	50	MOUNTPROC_DUMP = 2,
	51	MOUNTPROC_UMNT = 3,
	52	MOUNTPROC_UMNTALL = 4,
	53	MOUNTPROC_EXPORT = 5,
	54	};
	55
	56	/*
	57	* Defined by RFC 1813, section 5.2
	58	*/
	59	enum {
	60	MOUNTPROC3_NULL = 0,
	61	MOUNTPROC3_MNT = 1,
	62	MOUNTPROC3_DUMP = 2,
	63	MOUNTPROC3_UMNT = 3,
	64	MOUNTPROC3_UMNTALL = 4,
	65	MOUNTPROC3_EXPORT = 5,
	66	};
	67
a613fa16	68	static const struct rpc_program mnt_program;
1da177e4	69
fb125295 CL	70	/*
	71	* Defined by OpenGroup XNFS Version 3W, chapter 8
	72	*/
	73	enum mountstat {
	74	MNT_OK = 0,
	75	MNT_EPERM = 1,
	76	MNT_ENOENT = 2,
	77	MNT_EACCES = 13,
	78	MNT_EINVAL = 22,
	79	};
	80
	81	static struct {
	82	u32 status;
	83	int errno;
	84	} mnt_errtbl[] = {
	85	{ .status = MNT_OK, .errno = 0, },
	86	{ .status = MNT_EPERM, .errno = -EPERM, },
	87	{ .status = MNT_ENOENT, .errno = -ENOENT, },
	88	{ .status = MNT_EACCES, .errno = -EACCES, },
	89	{ .status = MNT_EINVAL, .errno = -EINVAL, },
	90	};
	91
	92	/*
	93	* Defined by RFC 1813, section 5.1.5
	94	*/
	95	enum mountstat3 {
	96	MNT3_OK = 0, /* no error */
	97	MNT3ERR_PERM = 1, /* Not owner */
	98	MNT3ERR_NOENT = 2, /* No such file or directory */
	99	MNT3ERR_IO = 5, /* I/O error */
	100	MNT3ERR_ACCES = 13, /* Permission denied */
	101	MNT3ERR_NOTDIR = 20, /* Not a directory */
	102	MNT3ERR_INVAL = 22, /* Invalid argument */
	103	MNT3ERR_NAMETOOLONG = 63, /* Filename too long */
	104	MNT3ERR_NOTSUPP = 10004, /* Operation not supported */
	105	MNT3ERR_SERVERFAULT = 10006, /* A failure on the server */
	106	};
	107
	108	static struct {
	109	u32 status;
	110	int errno;
	111	} mnt3_errtbl[] = {
	112	{ .status = MNT3_OK, .errno = 0, },
	113	{ .status = MNT3ERR_PERM, .errno = -EPERM, },
	114	{ .status = MNT3ERR_NOENT, .errno = -ENOENT, },
	115	{ .status = MNT3ERR_IO, .errno = -EIO, },
	116	{ .status = MNT3ERR_ACCES, .errno = -EACCES, },
	117	{ .status = MNT3ERR_NOTDIR, .errno = -ENOTDIR, },
	118	{ .status = MNT3ERR_INVAL, .errno = -EINVAL, },
	119	{ .status = MNT3ERR_NAMETOOLONG, .errno = -ENAMETOOLONG, },
	120	{ .status = MNT3ERR_NOTSUPP, .errno = -ENOTSUPP, },
fdcb4577	121	{ .status = MNT3ERR_SERVERFAULT, .errno = -EREMOTEIO, },
fb125295 CL	122	};
	123
	124	struct mountres {
	125	int errno;
	126	struct nfs_fh *fh;
a14017db CL	127	unsigned int *auth_count;
a14017db CL	128	rpc_authflavor_t *auth_flavors;
fb125295 CL	129	};
fb125295 CL	130
1da177e4	131	struct mnt_fhstatus {
19207231 CL	132	u32 status;
19207231 CL	133	struct nfs_fh *fh;
1da177e4 LT	134	};
1da177e4 LT	135
3ea97309 CL	136	/**
3ea97309 CL	137	* nfs_mount - Obtain an NFS file handle for the given host and path
c5d120f8	138	* @info: pointer to mount request arguments
3ea97309	139	*
fb9b02fd JL	140	* Uses default timeout parameters specified by underlying transport. On
	141	* successful return, the auth_flavs list and auth_flav_len will be populated
	142	* with the list from the server or a faked-up list if the server didn't
	143	* provide one.
1da177e4	144	*/
c5d120f8	145	int nfs_mount(struct nfs_mount_request *info)
1da177e4	146	{
8e02f6b9 CL	147	struct mountres result = {
	148	.fh = info->fh,
	149	.auth_count = info->auth_flav_len,
	150	.auth_flavors = info->auth_flavs,
1da177e4	151	};
dead28da	152	struct rpc_message msg = {
c5d120f8	153	.rpc_argp = info->dirpath,
dead28da CL	154	.rpc_resp = &result,
dead28da CL	155	};
3ea97309	156	struct rpc_create_args args = {
6d59b8d5	157	.net = info->net,
c5d120f8 CL	158	.protocol = info->protocol,
	159	.address = info->sap,
	160	.addrsize = info->salen,
	161	.servername = info->hostname,
3ea97309	162	.program = &mnt_program,
c5d120f8	163	.version = info->version,
3ea97309	164	.authflavor = RPC_AUTH_UNIX,
79caa5fa	165	.cred = current_cred(),
3ea97309 CL	166	};
3ea97309 CL	167	struct rpc_clnt *mnt_clnt;
1da177e4	168	int status;
1da177e4	169
3ea97309	170	dprintk("NFS: sending MNT request for %s:%s\n",
c5d120f8 CL	171	(info->hostname ? info->hostname : "server"),
c5d120f8 CL	172	info->dirpath);
1da177e4	173
28d79ea3 TM	174	if (strlen(info->dirpath) > MNTPATHLEN)
	175	return -ENAMETOOLONG;
	176
50a737f8 CL	177	if (info->noresvport)
	178	args.flags \|= RPC_CLNT_CREATE_NONPRIVPORT;
	179
3ea97309	180	mnt_clnt = rpc_create(&args);
1da177e4	181	if (IS_ERR(mnt_clnt))
013a8c1a	182	goto out_clnt_err;
1da177e4	183
c5d120f8	184	if (info->version == NFS_MNT3_VERSION)
dead28da CL	185	msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC3_MNT];
dead28da CL	186	else
2ad78097	187	msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC_MNT];
dead28da	188
acce94e6	189	status = rpc_call_sync(mnt_clnt, &msg, RPC_TASK_SOFT\|RPC_TASK_TIMEOUT);
90c5755f	190	rpc_shutdown_client(mnt_clnt);
013a8c1a CL	191
	192	if (status < 0)
	193	goto out_call_err;
8e02f6b9	194	if (result.errno != 0)
013a8c1a CL	195	goto out_mnt_err;
	196
	197	dprintk("NFS: MNT request succeeded\n");
	198	status = 0;
	199
fb9b02fd JL	200	/*
	201	* If the server didn't provide a flavor list, allow the
	202	* client to try any flavor.
	203	*/
	204	if (info->version != NFS_MNT3_VERSION \|\| *info->auth_flav_len == 0) {
	205	dprintk("NFS: Faking up auth_flavs list\n");
	206	info->auth_flavs[0] = RPC_AUTH_NULL;
	207	*info->auth_flav_len = 1;
	208	}
013a8c1a CL	209	out:
	210	return status;
	211
	212	out_clnt_err:
	213	status = PTR_ERR(mnt_clnt);
8e02f6b9	214	dprintk("NFS: failed to create MNT RPC client, status=%d\n", status);
013a8c1a CL	215	goto out;
	216
	217	out_call_err:
8e02f6b9	218	dprintk("NFS: MNT request failed, status=%d\n", status);
013a8c1a CL	219	goto out;
	220
	221	out_mnt_err:
8e02f6b9 CL	222	dprintk("NFS: MNT server returned result %d\n", result.errno);
8e02f6b9 CL	223	status = result.errno;
013a8c1a	224	goto out;
1da177e4 LT	225	}
1da177e4 LT	226
0b524123 CL	227	/**
	228	* nfs_umount - Notify a server that we have unmounted this export
	229	* @info: pointer to umount request arguments
	230	*
	231	* MOUNTPROC_UMNT is advisory, so we set a short timeout, and always
	232	* use UDP.
	233	*/
	234	void nfs_umount(const struct nfs_mount_request *info)
	235	{
	236	static const struct rpc_timeout nfs_umnt_timeout = {
	237	.to_initval = 1 * HZ,
	238	.to_maxval = 3 * HZ,
	239	.to_retries = 2,
	240	};
	241	struct rpc_create_args args = {
6d59b8d5	242	.net = info->net,
0b524123 CL	243	.protocol = IPPROTO_UDP,
	244	.address = info->sap,
	245	.addrsize = info->salen,
	246	.timeout = &nfs_umnt_timeout,
	247	.servername = info->hostname,
	248	.program = &mnt_program,
	249	.version = info->version,
	250	.authflavor = RPC_AUTH_UNIX,
	251	.flags = RPC_CLNT_CREATE_NOPING,
79caa5fa	252	.cred = current_cred(),
0b524123	253	};
0b524123 CL	254	struct rpc_message msg = {
0b524123 CL	255	.rpc_argp = info->dirpath,
0b524123 CL	256	};
	257	struct rpc_clnt *clnt;
	258	int status;
	259
28d79ea3 TM	260	if (strlen(info->dirpath) > MNTPATHLEN)
	261	return;
	262
0b524123 CL	263	if (info->noresvport)
	264	args.flags \|= RPC_CLNT_CREATE_NONPRIVPORT;
	265
	266	clnt = rpc_create(&args);
c8b031eb	267	if (IS_ERR(clnt))
0b524123 CL	268	goto out_clnt_err;
	269
	270	dprintk("NFS: sending UMNT request for %s:%s\n",
	271	(info->hostname ? info->hostname : "server"), info->dirpath);
	272
	273	if (info->version == NFS_MNT3_VERSION)
	274	msg.rpc_proc = &clnt->cl_procinfo[MOUNTPROC3_UMNT];
	275	else
	276	msg.rpc_proc = &clnt->cl_procinfo[MOUNTPROC_UMNT];
	277
	278	status = rpc_call_sync(clnt, &msg, 0);
	279	rpc_shutdown_client(clnt);
	280
	281	if (unlikely(status < 0))
	282	goto out_call_err;
	283
	284	return;
	285
	286	out_clnt_err:
	287	dprintk("NFS: failed to create UMNT RPC client, status=%ld\n",
	288	PTR_ERR(clnt));
	289	return;
	290
	291	out_call_err:
	292	dprintk("NFS: UMNT request failed, status=%d\n", status);
	293	}
	294
1da177e4 LT	295	/*
	296	* XDR encode/decode functions for MOUNT
	297	*/
1da177e4	298
98eb2b4f	299	static void encode_mntdirpath(struct xdr_stream xdr, const char pathname)
29a1bd6b CL	300	{
	301	const u32 pathname_len = strlen(pathname);
	302	__be32 *p;
	303
98eb2b4f	304	p = xdr_reserve_space(xdr, 4 + pathname_len);
29a1bd6b	305	xdr_encode_opaque(p, pathname, pathname_len);
29a1bd6b CL	306	}
29a1bd6b CL	307
9f06c719	308	static void mnt_xdr_enc_dirpath(struct rpc_rqst req, struct xdr_stream xdr,
fcc85819	309	const void *dirpath)
29a1bd6b	310	{
9f06c719	311	encode_mntdirpath(xdr, dirpath);
29a1bd6b CL	312	}
29a1bd6b CL	313
fb125295 CL	314	/*
	315	* RFC 1094: "A non-zero status indicates some sort of error. In this
	316	* case, the status is a UNIX error number." This can be problematic
	317	* if the server and client use different errno values for the same
	318	* error.
	319	*
	320	* However, the OpenGroup XNFS spec provides a simple mapping that is
	321	* independent of local errno values on the server and the client.
	322	*/
	323	static int decode_status(struct xdr_stream xdr, struct mountres res)
	324	{
	325	unsigned int i;
	326	u32 status;
	327	__be32 *p;
	328
98eb2b4f	329	p = xdr_inline_decode(xdr, 4);
fb125295 CL	330	if (unlikely(p == NULL))
fb125295 CL	331	return -EIO;
98eb2b4f	332	status = be32_to_cpup(p);
fb125295	333
dd8ac1da	334	for (i = 0; i < ARRAY_SIZE(mnt_errtbl); i++) {
fb125295 CL	335	if (mnt_errtbl[i].status == status) {
	336	res->errno = mnt_errtbl[i].errno;
	337	return 0;
	338	}
	339	}
	340
	341	dprintk("NFS: unrecognized MNT status code: %u\n", status);
	342	res->errno = -EACCES;
	343	return 0;
	344	}
	345
4fdcd996 CL	346	static int decode_fhandle(struct xdr_stream xdr, struct mountres res)
	347	{
	348	struct nfs_fh *fh = res->fh;
	349	__be32 *p;
	350
	351	p = xdr_inline_decode(xdr, NFS2_FHSIZE);
	352	if (unlikely(p == NULL))
	353	return -EIO;
	354
	355	fh->size = NFS2_FHSIZE;
	356	memcpy(fh->data, p, NFS2_FHSIZE);
	357	return 0;
	358	}
	359
bf269551 CL	360	static int mnt_xdr_dec_mountres(struct rpc_rqst *req,
bf269551 CL	361	struct xdr_stream *xdr,
fc016483	362	void *data)
8e02f6b9	363	{
fc016483	364	struct mountres *res = data;
8e02f6b9 CL	365	int status;
8e02f6b9 CL	366
bf269551	367	status = decode_status(xdr, res);
8e02f6b9 CL	368	if (unlikely(status != 0 \|\| res->errno != 0))
8e02f6b9 CL	369	return status;
bf269551	370	return decode_fhandle(xdr, res);
8e02f6b9 CL	371	}
8e02f6b9 CL	372
fb125295 CL	373	static int decode_fhs_status(struct xdr_stream xdr, struct mountres res)
	374	{
	375	unsigned int i;
	376	u32 status;
	377	__be32 *p;
	378
98eb2b4f	379	p = xdr_inline_decode(xdr, 4);
fb125295 CL	380	if (unlikely(p == NULL))
fb125295 CL	381	return -EIO;
98eb2b4f	382	status = be32_to_cpup(p);
fb125295	383
dd8ac1da	384	for (i = 0; i < ARRAY_SIZE(mnt3_errtbl); i++) {
fb125295 CL	385	if (mnt3_errtbl[i].status == status) {
	386	res->errno = mnt3_errtbl[i].errno;
	387	return 0;
	388	}
	389	}
	390
	391	dprintk("NFS: unrecognized MNT3 status code: %u\n", status);
	392	res->errno = -EACCES;
	393	return 0;
	394	}
	395
4fdcd996 CL	396	static int decode_fhandle3(struct xdr_stream xdr, struct mountres res)
	397	{
	398	struct nfs_fh *fh = res->fh;
	399	u32 size;
	400	__be32 *p;
	401
98eb2b4f	402	p = xdr_inline_decode(xdr, 4);
4fdcd996 CL	403	if (unlikely(p == NULL))
	404	return -EIO;
	405
98eb2b4f	406	size = be32_to_cpup(p);
4fdcd996 CL	407	if (size > NFS3_FHSIZE \|\| size == 0)
	408	return -EIO;
	409
	410	p = xdr_inline_decode(xdr, size);
	411	if (unlikely(p == NULL))
	412	return -EIO;
	413
	414	fh->size = size;
	415	memcpy(fh->data, p, size);
	416	return 0;
	417	}
	418
a14017db CL	419	static int decode_auth_flavors(struct xdr_stream xdr, struct mountres res)
	420	{
	421	rpc_authflavor_t *flavors = res->auth_flavors;
	422	unsigned int *count = res->auth_count;
	423	u32 entries, i;
	424	__be32 *p;
	425
	426	if (*count == 0)
	427	return 0;
	428
98eb2b4f	429	p = xdr_inline_decode(xdr, 4);
a14017db CL	430	if (unlikely(p == NULL))
a14017db CL	431	return -EIO;
98eb2b4f	432	entries = be32_to_cpup(p);
a14017db CL	433	dprintk("NFS: received %u auth flavors\n", entries);
	434	if (entries > NFS_MAX_SECFLAVORS)
	435	entries = NFS_MAX_SECFLAVORS;
	436
98eb2b4f	437	p = xdr_inline_decode(xdr, 4 * entries);
a14017db CL	438	if (unlikely(p == NULL))
	439	return -EIO;
	440
	441	if (entries > *count)
	442	entries = *count;
	443
	444	for (i = 0; i < entries; i++) {
98eb2b4f	445	flavors[i] = be32_to_cpup(p++);
ed58b291	446	dprintk("NFS: auth flavor[%u]: %d\n", i, flavors[i]);
a14017db CL	447	}
	448	*count = i;
	449
	450	return 0;
	451	}
	452
bf269551 CL	453	static int mnt_xdr_dec_mountres3(struct rpc_rqst *req,
bf269551 CL	454	struct xdr_stream *xdr,
fc016483	455	void *data)
8e02f6b9	456	{
fc016483	457	struct mountres *res = data;
8e02f6b9 CL	458	int status;
8e02f6b9 CL	459
bf269551	460	status = decode_fhs_status(xdr, res);
8e02f6b9 CL	461	if (unlikely(status != 0 \|\| res->errno != 0))
8e02f6b9 CL	462	return status;
bf269551	463	status = decode_fhandle3(xdr, res);
8e02f6b9 CL	464	if (unlikely(status != 0)) {
	465	res->errno = -EBADHANDLE;
	466	return 0;
	467	}
bf269551	468	return decode_auth_flavors(xdr, res);
8e02f6b9 CL	469	}
8e02f6b9 CL	470
511e936b	471	static const struct rpc_procinfo mnt_procedures[] = {
2ad78097 CL	472	[MOUNTPROC_MNT] = {
2ad78097 CL	473	.p_proc = MOUNTPROC_MNT,
fcc85819	474	.p_encode = mnt_xdr_enc_dirpath,
fc016483	475	.p_decode = mnt_xdr_dec_mountres,
29a1bd6b	476	.p_arglen = MNT_enc_dirpath_sz,
8e02f6b9	477	.p_replen = MNT_dec_mountres_sz,
2ad78097	478	.p_statidx = MOUNTPROC_MNT,
19207231	479	.p_name = "MOUNT",
1da177e4	480	},
0b524123 CL	481	[MOUNTPROC_UMNT] = {
0b524123 CL	482	.p_proc = MOUNTPROC_UMNT,
fcc85819	483	.p_encode = mnt_xdr_enc_dirpath,
0b524123 CL	484	.p_arglen = MNT_enc_dirpath_sz,
	485	.p_statidx = MOUNTPROC_UMNT,
	486	.p_name = "UMOUNT",
	487	},
1da177e4 LT	488	};
1da177e4 LT	489
511e936b	490	static const struct rpc_procinfo mnt3_procedures[] = {
19207231 CL	491	[MOUNTPROC3_MNT] = {
19207231 CL	492	.p_proc = MOUNTPROC3_MNT,
fcc85819	493	.p_encode = mnt_xdr_enc_dirpath,
fc016483	494	.p_decode = mnt_xdr_dec_mountres3,
29a1bd6b	495	.p_arglen = MNT_enc_dirpath_sz,
8e02f6b9	496	.p_replen = MNT_dec_mountres3_sz,
19207231 CL	497	.p_statidx = MOUNTPROC3_MNT,
19207231 CL	498	.p_name = "MOUNT",
1da177e4	499	},
0b524123 CL	500	[MOUNTPROC3_UMNT] = {
0b524123 CL	501	.p_proc = MOUNTPROC3_UMNT,
fcc85819	502	.p_encode = mnt_xdr_enc_dirpath,
0b524123 CL	503	.p_arglen = MNT_enc_dirpath_sz,
	504	.p_statidx = MOUNTPROC3_UMNT,
	505	.p_name = "UMOUNT",
	506	},
1da177e4 LT	507	};
1da177e4 LT	508
c551858a	509	static unsigned int mnt_counts[ARRAY_SIZE(mnt_procedures)];
a613fa16	510	static const struct rpc_version mnt_version1 = {
19207231	511	.number = 1,
5b362ac3	512	.nrprocs = ARRAY_SIZE(mnt_procedures),
19207231	513	.procs = mnt_procedures,
c551858a	514	.counts = mnt_counts,
1da177e4 LT	515	};
1da177e4 LT	516
ecc7b435	517	static unsigned int mnt3_counts[ARRAY_SIZE(mnt3_procedures)];
a613fa16	518	static const struct rpc_version mnt_version3 = {
19207231	519	.number = 3,
5b362ac3	520	.nrprocs = ARRAY_SIZE(mnt3_procedures),
19207231	521	.procs = mnt3_procedures,
c551858a	522	.counts = mnt3_counts,
1da177e4 LT	523	};
1da177e4 LT	524
a613fa16	525	static const struct rpc_version *mnt_version[] = {
1da177e4 LT	526	NULL,
	527	&mnt_version1,
	528	NULL,
	529	&mnt_version3,
	530	};
	531
19207231	532	static struct rpc_stat mnt_stats;
1da177e4	533
a613fa16	534	static const struct rpc_program mnt_program = {
1da177e4 LT	535	.name = "mount",
1da177e4 LT	536	.number = NFS_MNT_PROGRAM,
e8c96f8c	537	.nrvers = ARRAY_SIZE(mnt_version),
1da177e4 LT	538	.version = mnt_version,
	539	.stats = &mnt_stats,
	540	};