[mirror_ubuntu-bionic-kernel.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_fhs_status_sz	(1)
#define MNT_fhandle_sz		XDR_QUADLEN(NFS2_FHSIZE)
#define MNT_fhandle3_sz		(1 + 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_fhandle_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,
	};
	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,
	};
	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 CL	31	#define MNT_status_sz (1)
fb125295 CL	32	#define MNT_fhs_status_sz (1)
4fdcd996 CL	33	#define MNT_fhandle_sz XDR_QUADLEN(NFS2_FHSIZE)
4fdcd996 CL	34	#define MNT_fhandle3_sz (1 + XDR_QUADLEN(NFS3_FHSIZE))
a14017db	35	#define MNT_authflav3_sz (1 + NFS_MAX_SECFLAVORS)
29a1bd6b CL	36
	37	/*
	38	* XDR argument and result sizes
	39	*/
	40	#define MNT_enc_dirpath_sz encode_dirpath_sz
8e02f6b9 CL	41	#define MNT_dec_mountres_sz (MNT_status_sz + MNT_fhandle_sz)
	42	#define MNT_dec_mountres3_sz (MNT_status_sz + MNT_fhandle_sz + \
	43	MNT_authflav3_sz)
29a1bd6b	44
2ad78097 CL	45	/*
	46	* Defined by RFC 1094, section A.5
	47	*/
	48	enum {
	49	MOUNTPROC_NULL = 0,
	50	MOUNTPROC_MNT = 1,
	51	MOUNTPROC_DUMP = 2,
	52	MOUNTPROC_UMNT = 3,
	53	MOUNTPROC_UMNTALL = 4,
	54	MOUNTPROC_EXPORT = 5,
	55	};
	56
	57	/*
	58	* Defined by RFC 1813, section 5.2
	59	*/
	60	enum {
	61	MOUNTPROC3_NULL = 0,
	62	MOUNTPROC3_MNT = 1,
	63	MOUNTPROC3_DUMP = 2,
	64	MOUNTPROC3_UMNT = 3,
	65	MOUNTPROC3_UMNTALL = 4,
	66	MOUNTPROC3_EXPORT = 5,
	67	};
	68
a613fa16	69	static const struct rpc_program mnt_program;
1da177e4	70
fb125295 CL	71	/*
	72	* Defined by OpenGroup XNFS Version 3W, chapter 8
	73	*/
	74	enum mountstat {
	75	MNT_OK = 0,
	76	MNT_EPERM = 1,
	77	MNT_ENOENT = 2,
	78	MNT_EACCES = 13,
	79	MNT_EINVAL = 22,
	80	};
	81
	82	static struct {
	83	u32 status;
	84	int errno;
	85	} mnt_errtbl[] = {
	86	{ .status = MNT_OK, .errno = 0, },
	87	{ .status = MNT_EPERM, .errno = -EPERM, },
	88	{ .status = MNT_ENOENT, .errno = -ENOENT, },
	89	{ .status = MNT_EACCES, .errno = -EACCES, },
	90	{ .status = MNT_EINVAL, .errno = -EINVAL, },
	91	};
	92
	93	/*
	94	* Defined by RFC 1813, section 5.1.5
	95	*/
	96	enum mountstat3 {
	97	MNT3_OK = 0, /* no error */
	98	MNT3ERR_PERM = 1, /* Not owner */
	99	MNT3ERR_NOENT = 2, /* No such file or directory */
	100	MNT3ERR_IO = 5, /* I/O error */
	101	MNT3ERR_ACCES = 13, /* Permission denied */
	102	MNT3ERR_NOTDIR = 20, /* Not a directory */
	103	MNT3ERR_INVAL = 22, /* Invalid argument */
	104	MNT3ERR_NAMETOOLONG = 63, /* Filename too long */
	105	MNT3ERR_NOTSUPP = 10004, /* Operation not supported */
	106	MNT3ERR_SERVERFAULT = 10006, /* A failure on the server */
	107	};
	108
	109	static struct {
	110	u32 status;
	111	int errno;
	112	} mnt3_errtbl[] = {
	113	{ .status = MNT3_OK, .errno = 0, },
	114	{ .status = MNT3ERR_PERM, .errno = -EPERM, },
	115	{ .status = MNT3ERR_NOENT, .errno = -ENOENT, },
	116	{ .status = MNT3ERR_IO, .errno = -EIO, },
	117	{ .status = MNT3ERR_ACCES, .errno = -EACCES, },
	118	{ .status = MNT3ERR_NOTDIR, .errno = -ENOTDIR, },
	119	{ .status = MNT3ERR_INVAL, .errno = -EINVAL, },
	120	{ .status = MNT3ERR_NAMETOOLONG, .errno = -ENAMETOOLONG, },
	121	{ .status = MNT3ERR_NOTSUPP, .errno = -ENOTSUPP, },
fdcb4577	122	{ .status = MNT3ERR_SERVERFAULT, .errno = -EREMOTEIO, },
fb125295 CL	123	};
	124
	125	struct mountres {
	126	int errno;
	127	struct nfs_fh *fh;
a14017db CL	128	unsigned int *auth_count;
a14017db CL	129	rpc_authflavor_t *auth_flavors;
fb125295 CL	130	};
fb125295 CL	131
1da177e4	132	struct mnt_fhstatus {
19207231 CL	133	u32 status;
19207231 CL	134	struct nfs_fh *fh;
1da177e4 LT	135	};
1da177e4 LT	136
3ea97309 CL	137	/**
3ea97309 CL	138	* nfs_mount - Obtain an NFS file handle for the given host and path
c5d120f8	139	* @info: pointer to mount request arguments
3ea97309	140	*
fb9b02fd JL	141	* Uses default timeout parameters specified by underlying transport. On
	142	* successful return, the auth_flavs list and auth_flav_len will be populated
	143	* with the list from the server or a faked-up list if the server didn't
	144	* provide one.
1da177e4	145	*/
c5d120f8	146	int nfs_mount(struct nfs_mount_request *info)
1da177e4	147	{
8e02f6b9 CL	148	struct mountres result = {
	149	.fh = info->fh,
	150	.auth_count = info->auth_flav_len,
	151	.auth_flavors = info->auth_flavs,
1da177e4	152	};
dead28da	153	struct rpc_message msg = {
c5d120f8	154	.rpc_argp = info->dirpath,
dead28da CL	155	.rpc_resp = &result,
dead28da CL	156	};
3ea97309	157	struct rpc_create_args args = {
6d59b8d5	158	.net = info->net,
c5d120f8 CL	159	.protocol = info->protocol,
	160	.address = info->sap,
	161	.addrsize = info->salen,
	162	.servername = info->hostname,
3ea97309	163	.program = &mnt_program,
c5d120f8	164	.version = info->version,
3ea97309	165	.authflavor = RPC_AUTH_UNIX,
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,
	252	};
0b524123 CL	253	struct rpc_message msg = {
0b524123 CL	254	.rpc_argp = info->dirpath,
0b524123 CL	255	};
	256	struct rpc_clnt *clnt;
	257	int status;
	258
28d79ea3 TM	259	if (strlen(info->dirpath) > MNTPATHLEN)
	260	return;
	261
0b524123 CL	262	if (info->noresvport)
	263	args.flags \|= RPC_CLNT_CREATE_NONPRIVPORT;
	264
	265	clnt = rpc_create(&args);
c8b031eb	266	if (IS_ERR(clnt))
0b524123 CL	267	goto out_clnt_err;
	268
	269	dprintk("NFS: sending UMNT request for %s:%s\n",
	270	(info->hostname ? info->hostname : "server"), info->dirpath);
	271
	272	if (info->version == NFS_MNT3_VERSION)
	273	msg.rpc_proc = &clnt->cl_procinfo[MOUNTPROC3_UMNT];
	274	else
	275	msg.rpc_proc = &clnt->cl_procinfo[MOUNTPROC_UMNT];
	276
	277	status = rpc_call_sync(clnt, &msg, 0);
	278	rpc_shutdown_client(clnt);
	279
	280	if (unlikely(status < 0))
	281	goto out_call_err;
	282
	283	return;
	284
	285	out_clnt_err:
	286	dprintk("NFS: failed to create UMNT RPC client, status=%ld\n",
	287	PTR_ERR(clnt));
	288	return;
	289
	290	out_call_err:
	291	dprintk("NFS: UMNT request failed, status=%d\n", status);
	292	}
	293
1da177e4 LT	294	/*
	295	* XDR encode/decode functions for MOUNT
	296	*/
1da177e4	297
98eb2b4f	298	static void encode_mntdirpath(struct xdr_stream xdr, const char pathname)
29a1bd6b CL	299	{
	300	const u32 pathname_len = strlen(pathname);
	301	__be32 *p;
	302
98eb2b4f	303	p = xdr_reserve_space(xdr, 4 + pathname_len);
29a1bd6b	304	xdr_encode_opaque(p, pathname, pathname_len);
29a1bd6b CL	305	}
29a1bd6b CL	306
9f06c719	307	static void mnt_xdr_enc_dirpath(struct rpc_rqst req, struct xdr_stream xdr,
fcc85819	308	const void *dirpath)
29a1bd6b	309	{
9f06c719	310	encode_mntdirpath(xdr, dirpath);
29a1bd6b CL	311	}
29a1bd6b CL	312
fb125295 CL	313	/*
	314	* RFC 1094: "A non-zero status indicates some sort of error. In this
	315	* case, the status is a UNIX error number." This can be problematic
	316	* if the server and client use different errno values for the same
	317	* error.
	318	*
	319	* However, the OpenGroup XNFS spec provides a simple mapping that is
	320	* independent of local errno values on the server and the client.
	321	*/
	322	static int decode_status(struct xdr_stream xdr, struct mountres res)
	323	{
	324	unsigned int i;
	325	u32 status;
	326	__be32 *p;
	327
98eb2b4f	328	p = xdr_inline_decode(xdr, 4);
fb125295 CL	329	if (unlikely(p == NULL))
fb125295 CL	330	return -EIO;
98eb2b4f	331	status = be32_to_cpup(p);
fb125295	332
dd8ac1da	333	for (i = 0; i < ARRAY_SIZE(mnt_errtbl); i++) {
fb125295 CL	334	if (mnt_errtbl[i].status == status) {
	335	res->errno = mnt_errtbl[i].errno;
	336	return 0;
	337	}
	338	}
	339
	340	dprintk("NFS: unrecognized MNT status code: %u\n", status);
	341	res->errno = -EACCES;
	342	return 0;
	343	}
	344
4fdcd996 CL	345	static int decode_fhandle(struct xdr_stream xdr, struct mountres res)
	346	{
	347	struct nfs_fh *fh = res->fh;
	348	__be32 *p;
	349
	350	p = xdr_inline_decode(xdr, NFS2_FHSIZE);
	351	if (unlikely(p == NULL))
	352	return -EIO;
	353
	354	fh->size = NFS2_FHSIZE;
	355	memcpy(fh->data, p, NFS2_FHSIZE);
	356	return 0;
	357	}
	358
bf269551 CL	359	static int mnt_xdr_dec_mountres(struct rpc_rqst *req,
bf269551 CL	360	struct xdr_stream *xdr,
fc016483	361	void *data)
8e02f6b9	362	{
fc016483	363	struct mountres *res = data;
8e02f6b9 CL	364	int status;
8e02f6b9 CL	365
bf269551	366	status = decode_status(xdr, res);
8e02f6b9 CL	367	if (unlikely(status != 0 \|\| res->errno != 0))
8e02f6b9 CL	368	return status;
bf269551	369	return decode_fhandle(xdr, res);
8e02f6b9 CL	370	}
8e02f6b9 CL	371
fb125295 CL	372	static int decode_fhs_status(struct xdr_stream xdr, struct mountres res)
	373	{
	374	unsigned int i;
	375	u32 status;
	376	__be32 *p;
	377
98eb2b4f	378	p = xdr_inline_decode(xdr, 4);
fb125295 CL	379	if (unlikely(p == NULL))
fb125295 CL	380	return -EIO;
98eb2b4f	381	status = be32_to_cpup(p);
fb125295	382
dd8ac1da	383	for (i = 0; i < ARRAY_SIZE(mnt3_errtbl); i++) {
fb125295 CL	384	if (mnt3_errtbl[i].status == status) {
	385	res->errno = mnt3_errtbl[i].errno;
	386	return 0;
	387	}
	388	}
	389
	390	dprintk("NFS: unrecognized MNT3 status code: %u\n", status);
	391	res->errno = -EACCES;
	392	return 0;
	393	}
	394
4fdcd996 CL	395	static int decode_fhandle3(struct xdr_stream xdr, struct mountres res)
	396	{
	397	struct nfs_fh *fh = res->fh;
	398	u32 size;
	399	__be32 *p;
	400
98eb2b4f	401	p = xdr_inline_decode(xdr, 4);
4fdcd996 CL	402	if (unlikely(p == NULL))
	403	return -EIO;
	404
98eb2b4f	405	size = be32_to_cpup(p);
4fdcd996 CL	406	if (size > NFS3_FHSIZE \|\| size == 0)
	407	return -EIO;
	408
	409	p = xdr_inline_decode(xdr, size);
	410	if (unlikely(p == NULL))
	411	return -EIO;
	412
	413	fh->size = size;
	414	memcpy(fh->data, p, size);
	415	return 0;
	416	}
	417
a14017db CL	418	static int decode_auth_flavors(struct xdr_stream xdr, struct mountres res)
	419	{
	420	rpc_authflavor_t *flavors = res->auth_flavors;
	421	unsigned int *count = res->auth_count;
	422	u32 entries, i;
	423	__be32 *p;
	424
	425	if (*count == 0)
	426	return 0;
	427
98eb2b4f	428	p = xdr_inline_decode(xdr, 4);
a14017db CL	429	if (unlikely(p == NULL))
a14017db CL	430	return -EIO;
98eb2b4f	431	entries = be32_to_cpup(p);
a14017db CL	432	dprintk("NFS: received %u auth flavors\n", entries);
	433	if (entries > NFS_MAX_SECFLAVORS)
	434	entries = NFS_MAX_SECFLAVORS;
	435
98eb2b4f	436	p = xdr_inline_decode(xdr, 4 * entries);
a14017db CL	437	if (unlikely(p == NULL))
	438	return -EIO;
	439
	440	if (entries > *count)
	441	entries = *count;
	442
	443	for (i = 0; i < entries; i++) {
98eb2b4f	444	flavors[i] = be32_to_cpup(p++);
ed58b291	445	dprintk("NFS: auth flavor[%u]: %d\n", i, flavors[i]);
a14017db CL	446	}
	447	*count = i;
	448
	449	return 0;
	450	}
	451
bf269551 CL	452	static int mnt_xdr_dec_mountres3(struct rpc_rqst *req,
bf269551 CL	453	struct xdr_stream *xdr,
fc016483	454	void *data)
8e02f6b9	455	{
fc016483	456	struct mountres *res = data;
8e02f6b9 CL	457	int status;
8e02f6b9 CL	458
bf269551	459	status = decode_fhs_status(xdr, res);
8e02f6b9 CL	460	if (unlikely(status != 0 \|\| res->errno != 0))
8e02f6b9 CL	461	return status;
bf269551	462	status = decode_fhandle3(xdr, res);
8e02f6b9 CL	463	if (unlikely(status != 0)) {
	464	res->errno = -EBADHANDLE;
	465	return 0;
	466	}
bf269551	467	return decode_auth_flavors(xdr, res);
8e02f6b9 CL	468	}
8e02f6b9 CL	469
511e936b	470	static const struct rpc_procinfo mnt_procedures[] = {
2ad78097 CL	471	[MOUNTPROC_MNT] = {
2ad78097 CL	472	.p_proc = MOUNTPROC_MNT,
fcc85819	473	.p_encode = mnt_xdr_enc_dirpath,
fc016483	474	.p_decode = mnt_xdr_dec_mountres,
29a1bd6b	475	.p_arglen = MNT_enc_dirpath_sz,
8e02f6b9	476	.p_replen = MNT_dec_mountres_sz,
2ad78097	477	.p_statidx = MOUNTPROC_MNT,
19207231	478	.p_name = "MOUNT",
1da177e4	479	},
0b524123 CL	480	[MOUNTPROC_UMNT] = {
0b524123 CL	481	.p_proc = MOUNTPROC_UMNT,
fcc85819	482	.p_encode = mnt_xdr_enc_dirpath,
0b524123 CL	483	.p_arglen = MNT_enc_dirpath_sz,
	484	.p_statidx = MOUNTPROC_UMNT,
	485	.p_name = "UMOUNT",
	486	},
1da177e4 LT	487	};
1da177e4 LT	488
511e936b	489	static const struct rpc_procinfo mnt3_procedures[] = {
19207231 CL	490	[MOUNTPROC3_MNT] = {
19207231 CL	491	.p_proc = MOUNTPROC3_MNT,
fcc85819	492	.p_encode = mnt_xdr_enc_dirpath,
fc016483	493	.p_decode = mnt_xdr_dec_mountres3,
29a1bd6b	494	.p_arglen = MNT_enc_dirpath_sz,
8e02f6b9	495	.p_replen = MNT_dec_mountres3_sz,
19207231 CL	496	.p_statidx = MOUNTPROC3_MNT,
19207231 CL	497	.p_name = "MOUNT",
1da177e4	498	},
0b524123 CL	499	[MOUNTPROC3_UMNT] = {
0b524123 CL	500	.p_proc = MOUNTPROC3_UMNT,
fcc85819	501	.p_encode = mnt_xdr_enc_dirpath,
0b524123 CL	502	.p_arglen = MNT_enc_dirpath_sz,
	503	.p_statidx = MOUNTPROC3_UMNT,
	504	.p_name = "UMOUNT",
	505	},
1da177e4 LT	506	};
1da177e4 LT	507
c551858a	508	static unsigned int mnt_counts[ARRAY_SIZE(mnt_procedures)];
a613fa16	509	static const struct rpc_version mnt_version1 = {
19207231	510	.number = 1,
5b362ac3	511	.nrprocs = ARRAY_SIZE(mnt_procedures),
19207231	512	.procs = mnt_procedures,
c551858a	513	.counts = mnt_counts,
1da177e4 LT	514	};
1da177e4 LT	515
ecc7b435	516	static unsigned int mnt3_counts[ARRAY_SIZE(mnt3_procedures)];
a613fa16	517	static const struct rpc_version mnt_version3 = {
19207231	518	.number = 3,
5b362ac3	519	.nrprocs = ARRAY_SIZE(mnt3_procedures),
19207231	520	.procs = mnt3_procedures,
c551858a	521	.counts = mnt3_counts,
1da177e4 LT	522	};
1da177e4 LT	523
a613fa16	524	static const struct rpc_version *mnt_version[] = {
1da177e4 LT	525	NULL,
	526	&mnt_version1,
	527	NULL,
	528	&mnt_version3,
	529	};
	530
19207231	531	static struct rpc_stat mnt_stats;
1da177e4	532
a613fa16	533	static const struct rpc_program mnt_program = {
1da177e4 LT	534	.name = "mount",
1da177e4 LT	535	.number = NFS_MNT_PROGRAM,
e8c96f8c	536	.nrvers = ARRAY_SIZE(mnt_version),
1da177e4 LT	537	.version = mnt_version,
	538	.stats = &mnt_stats,
	539	};