[linux-2.6-block.git] / fs / cifs / xattr.c

/*
 *   fs/cifs/xattr.c
 *
 *   Copyright (c) International Business Machines  Corp., 2003, 2007
 *   Author(s): Steve French (sfrench@us.ibm.com)
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published
 *   by the Free Software Foundation; either version 2.1 of the License, or
 *   (at your option) any later version.
 *
 *   This library is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/fs.h>
#include <linux/posix_acl_xattr.h>
#include <linux/slab.h>
#include <linux/xattr.h>
#include "cifsfs.h"
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"
#include "cifs_unicode.h"

#define MAX_EA_VALUE_SIZE CIFSMaxBufSize
#define CIFS_XATTR_CIFS_ACL "system.cifs_acl" /* DACL only */
#define CIFS_XATTR_CIFS_NTSD "system.cifs_ntsd" /* owner plus DACL */
#define CIFS_XATTR_ATTRIB "cifs.dosattrib"  /* full name: user.cifs.dosattrib */
#define CIFS_XATTR_CREATETIME "cifs.creationtime"  /* user.cifs.creationtime */
/*
 * Although these three are just aliases for the above, need to move away from
 * confusing users and using the 20+ year old term 'cifs' when it is no longer
 * secure, replaced by SMB2 (then even more highly secure SMB3) many years ago
 */
#define SMB3_XATTR_CIFS_ACL "system.smb3_acl" /* DACL only */
#define SMB3_XATTR_CIFS_NTSD "system.smb3_ntsd" /* owner plus DACL */
#define SMB3_XATTR_ATTRIB "smb3.dosattrib"  /* full name: user.smb3.dosattrib */
#define SMB3_XATTR_CREATETIME "smb3.creationtime"  /* user.smb3.creationtime */
/* BB need to add server (Samba e.g) support for security and trusted prefix */

enum { XATTR_USER, XATTR_CIFS_ACL, XATTR_ACL_ACCESS, XATTR_ACL_DEFAULT,
	XATTR_CIFS_NTSD };

static int cifs_attrib_set(unsigned int xid, struct cifs_tcon *pTcon,
			   struct inode *inode, char *full_path,
			   const void *value, size_t size)
{
	ssize_t rc = -EOPNOTSUPP;
	__u32 *pattrib = (__u32 *)value;
	__u32 attrib;
	FILE_BASIC_INFO info_buf;

	if ((value == NULL) || (size != sizeof(__u32)))
		return -ERANGE;

	memset(&info_buf, 0, sizeof(info_buf));
	attrib = *pattrib;
	info_buf.Attributes = cpu_to_le32(attrib);
	if (pTcon->ses->server->ops->set_file_info)
		rc = pTcon->ses->server->ops->set_file_info(inode, full_path,
				&info_buf, xid);
	if (rc == 0)
		CIFS_I(inode)->cifsAttrs = attrib;

	return rc;
}

static int cifs_creation_time_set(unsigned int xid, struct cifs_tcon *pTcon,
				  struct inode *inode, char *full_path,
				  const void *value, size_t size)
{
	ssize_t rc = -EOPNOTSUPP;
	__u64 *pcreation_time = (__u64 *)value;
	__u64 creation_time;
	FILE_BASIC_INFO info_buf;

	if ((value == NULL) || (size != sizeof(__u64)))
		return -ERANGE;

	memset(&info_buf, 0, sizeof(info_buf));
	creation_time = *pcreation_time;
	info_buf.CreationTime = cpu_to_le64(creation_time);
	if (pTcon->ses->server->ops->set_file_info)
		rc = pTcon->ses->server->ops->set_file_info(inode, full_path,
				&info_buf, xid);
	if (rc == 0)
		CIFS_I(inode)->createtime = creation_time;

	return rc;
}

static int cifs_xattr_set(const struct xattr_handler *handler,
			  struct dentry *dentry, struct inode *inode,
			  const char *name, const void *value,
			  size_t size, int flags)
{
	int rc = -EOPNOTSUPP;
	unsigned int xid;
	struct super_block *sb = dentry->d_sb;
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
	struct tcon_link *tlink;
	struct cifs_tcon *pTcon;
	char *full_path;

	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink))
		return PTR_ERR(tlink);
	pTcon = tlink_tcon(tlink);

	xid = get_xid();

	full_path = build_path_from_dentry(dentry);
	if (full_path == NULL) {
		rc = -ENOMEM;
		goto out;
	}
	/* return dos attributes as pseudo xattr */
	/* return alt name if available as pseudo attr */

	/* if proc/fs/cifs/streamstoxattr is set then
		search server for EAs or streams to
		returns as xattrs */
	if (size > MAX_EA_VALUE_SIZE) {
		cifs_dbg(FYI, "size of EA value too large\n");
		rc = -EOPNOTSUPP;
		goto out;
	}

	switch (handler->flags) {
	case XATTR_USER:
		cifs_dbg(FYI, "%s:setting user xattr %s\n", __func__, name);
		if ((strcmp(name, CIFS_XATTR_ATTRIB) == 0) ||
		    (strcmp(name, SMB3_XATTR_ATTRIB) == 0)) {
			rc = cifs_attrib_set(xid, pTcon, inode, full_path,
					value, size);
			if (rc == 0) /* force revalidate of the inode */
				CIFS_I(inode)->time = 0;
			break;
		} else if ((strcmp(name, CIFS_XATTR_CREATETIME) == 0) ||
			   (strcmp(name, SMB3_XATTR_CREATETIME) == 0)) {
			rc = cifs_creation_time_set(xid, pTcon, inode,
					full_path, value, size);
			if (rc == 0) /* force revalidate of the inode */
				CIFS_I(inode)->time = 0;
			break;
		}

		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
			goto out;

		if (pTcon->ses->server->ops->set_EA)
			rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
				full_path, name, value, (__u16)size,
				cifs_sb->local_nls, cifs_sb);
		break;

	case XATTR_CIFS_ACL:
	case XATTR_CIFS_NTSD: {
		struct cifs_ntsd *pacl;

		if (!value)
			goto out;
		pacl = kmalloc(size, GFP_KERNEL);
		if (!pacl) {
			rc = -ENOMEM;
		} else {
			memcpy(pacl, value, size);
			if (value &&
			    pTcon->ses->server->ops->set_acl) {
				rc = 0;
				if (handler->flags == XATTR_CIFS_NTSD) {
					/* set owner and DACL */
					rc = pTcon->ses->server->ops->set_acl(
							pacl, size, inode,
							full_path,
							CIFS_ACL_OWNER);
				}
				if (rc == 0) {
					/* set DACL */
					rc = pTcon->ses->server->ops->set_acl(
							pacl, size, inode,
							full_path,
							CIFS_ACL_DACL);
				}
			} else {
				rc = -EOPNOTSUPP;
			}
			if (rc == 0) /* force revalidate of the inode */
				CIFS_I(inode)->time = 0;
			kfree(pacl);
		}
		break;
	}

	case XATTR_ACL_ACCESS:
#ifdef CONFIG_CIFS_POSIX
		if (!value)
			goto out;
		if (sb->s_flags & SB_POSIXACL)
			rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
				value, (const int)size,
				ACL_TYPE_ACCESS, cifs_sb->local_nls,
				cifs_remap(cifs_sb));
#endif  /* CONFIG_CIFS_POSIX */
		break;

	case XATTR_ACL_DEFAULT:
#ifdef CONFIG_CIFS_POSIX
		if (!value)
			goto out;
		if (sb->s_flags & SB_POSIXACL)
			rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
				value, (const int)size,
				ACL_TYPE_DEFAULT, cifs_sb->local_nls,
				cifs_remap(cifs_sb));
#endif  /* CONFIG_CIFS_POSIX */
		break;
	}

out:
	kfree(full_path);
	free_xid(xid);
	cifs_put_tlink(tlink);
	return rc;
}

static int cifs_attrib_get(struct dentry *dentry,
			   struct inode *inode, void *value,
			   size_t size)
{
	ssize_t rc;
	__u32 *pattribute;

	rc = cifs_revalidate_dentry_attr(dentry);

	if (rc)
		return rc;

	if ((value == NULL) || (size == 0))
		return sizeof(__u32);
	else if (size < sizeof(__u32))
		return -ERANGE;

	/* return dos attributes as pseudo xattr */
	pattribute = (__u32 *)value;
	*pattribute = CIFS_I(inode)->cifsAttrs;

	return sizeof(__u32);
}

static int cifs_creation_time_get(struct dentry *dentry, struct inode *inode,
				  void *value, size_t size)
{
	ssize_t rc;
	__u64 *pcreatetime;

	rc = cifs_revalidate_dentry_attr(dentry);
	if (rc)
		return rc;

	if ((value == NULL) || (size == 0))
		return sizeof(__u64);
	else if (size < sizeof(__u64))
		return -ERANGE;

	/* return dos attributes as pseudo xattr */
	pcreatetime = (__u64 *)value;
	*pcreatetime = CIFS_I(inode)->createtime;
	return sizeof(__u64);
}


static int cifs_xattr_get(const struct xattr_handler *handler,
			  struct dentry *dentry, struct inode *inode,
			  const char *name, void *value, size_t size)
{
	ssize_t rc = -EOPNOTSUPP;
	unsigned int xid;
	struct super_block *sb = dentry->d_sb;
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
	struct tcon_link *tlink;
	struct cifs_tcon *pTcon;
	char *full_path;

	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink))
		return PTR_ERR(tlink);
	pTcon = tlink_tcon(tlink);

	xid = get_xid();

	full_path = build_path_from_dentry(dentry);
	if (full_path == NULL) {
		rc = -ENOMEM;
		goto out;
	}

	/* return alt name if available as pseudo attr */
	switch (handler->flags) {
	case XATTR_USER:
		cifs_dbg(FYI, "%s:querying user xattr %s\n", __func__, name);
		if ((strcmp(name, CIFS_XATTR_ATTRIB) == 0) ||
		    (strcmp(name, SMB3_XATTR_ATTRIB) == 0)) {
			rc = cifs_attrib_get(dentry, inode, value, size);
			break;
		} else if ((strcmp(name, CIFS_XATTR_CREATETIME) == 0) ||
		    (strcmp(name, SMB3_XATTR_CREATETIME) == 0)) {
			rc = cifs_creation_time_get(dentry, inode, value, size);
			break;
		}

		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
			goto out;

		if (pTcon->ses->server->ops->query_all_EAs)
			rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
				full_path, name, value, size, cifs_sb);
		break;

	case XATTR_CIFS_ACL:
	case XATTR_CIFS_NTSD: {
		/* the whole ntsd is fetched regardless */
		u32 acllen;
		struct cifs_ntsd *pacl;

		if (pTcon->ses->server->ops->get_acl == NULL)
			goto out; /* rc already EOPNOTSUPP */

		pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
				inode, full_path, &acllen);
		if (IS_ERR(pacl)) {
			rc = PTR_ERR(pacl);
			cifs_dbg(VFS, "%s: error %zd getting sec desc\n",
				 __func__, rc);
		} else {
			if (value) {
				if (acllen > size)
					acllen = -ERANGE;
				else
					memcpy(value, pacl, acllen);
			}
			rc = acllen;
			kfree(pacl);
		}
		break;
	}

	case XATTR_ACL_ACCESS:
#ifdef CONFIG_CIFS_POSIX
		if (sb->s_flags & SB_POSIXACL)
			rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
				value, size, ACL_TYPE_ACCESS,
				cifs_sb->local_nls,
				cifs_remap(cifs_sb));
#endif  /* CONFIG_CIFS_POSIX */
		break;

	case XATTR_ACL_DEFAULT:
#ifdef CONFIG_CIFS_POSIX
		if (sb->s_flags & SB_POSIXACL)
			rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
				value, size, ACL_TYPE_DEFAULT,
				cifs_sb->local_nls,
				cifs_remap(cifs_sb));
#endif  /* CONFIG_CIFS_POSIX */
		break;
	}

	/* We could add an additional check for streams ie
	    if proc/fs/cifs/streamstoxattr is set then
		search server for EAs or streams to
		returns as xattrs */

	if (rc == -EINVAL)
		rc = -EOPNOTSUPP;

out:
	kfree(full_path);
	free_xid(xid);
	cifs_put_tlink(tlink);
	return rc;
}

ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
{
	ssize_t rc = -EOPNOTSUPP;
	unsigned int xid;
	struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
	struct tcon_link *tlink;
	struct cifs_tcon *pTcon;
	char *full_path;

	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
		return -EOPNOTSUPP;

	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink))
		return PTR_ERR(tlink);
	pTcon = tlink_tcon(tlink);

	xid = get_xid();

	full_path = build_path_from_dentry(direntry);
	if (full_path == NULL) {
		rc = -ENOMEM;
		goto list_ea_exit;
	}
	/* return dos attributes as pseudo xattr */
	/* return alt name if available as pseudo attr */

	/* if proc/fs/cifs/streamstoxattr is set then
		search server for EAs or streams to
		returns as xattrs */

	if (pTcon->ses->server->ops->query_all_EAs)
		rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
				full_path, NULL, data, buf_size, cifs_sb);
list_ea_exit:
	kfree(full_path);
	free_xid(xid);
	cifs_put_tlink(tlink);
	return rc;
}

static const struct xattr_handler cifs_user_xattr_handler = {
	.prefix = XATTR_USER_PREFIX,
	.flags = XATTR_USER,
	.get = cifs_xattr_get,
	.set = cifs_xattr_set,
};

/* os2.* attributes are treated like user.* attributes */
static const struct xattr_handler cifs_os2_xattr_handler = {
	.prefix = XATTR_OS2_PREFIX,
	.flags = XATTR_USER,
	.get = cifs_xattr_get,
	.set = cifs_xattr_set,
};

static const struct xattr_handler cifs_cifs_acl_xattr_handler = {
	.name = CIFS_XATTR_CIFS_ACL,
	.flags = XATTR_CIFS_ACL,
	.get = cifs_xattr_get,
	.set = cifs_xattr_set,
};

/*
 * Although this is just an alias for the above, need to move away from
 * confusing users and using the 20 year old term 'cifs' when it is no
 * longer secure and was replaced by SMB2/SMB3 a long time ago, and
 * SMB3 and later are highly secure.
 */
static const struct xattr_handler smb3_acl_xattr_handler = {
	.name = SMB3_XATTR_CIFS_ACL,
	.flags = XATTR_CIFS_ACL,
	.get = cifs_xattr_get,
	.set = cifs_xattr_set,
};

static const struct xattr_handler cifs_cifs_ntsd_xattr_handler = {
	.name = CIFS_XATTR_CIFS_NTSD,
	.flags = XATTR_CIFS_NTSD,
	.get = cifs_xattr_get,
	.set = cifs_xattr_set,
};

/*
 * Although this is just an alias for the above, need to move away from
 * confusing users and using the 20 year old term 'cifs' when it is no
 * longer secure and was replaced by SMB2/SMB3 a long time ago, and
 * SMB3 and later are highly secure.
 */
static const struct xattr_handler smb3_ntsd_xattr_handler = {
	.name = SMB3_XATTR_CIFS_NTSD,
	.flags = XATTR_CIFS_NTSD,
	.get = cifs_xattr_get,
	.set = cifs_xattr_set,
};

static const struct xattr_handler cifs_posix_acl_access_xattr_handler = {
	.name = XATTR_NAME_POSIX_ACL_ACCESS,
	.flags = XATTR_ACL_ACCESS,
	.get = cifs_xattr_get,
	.set = cifs_xattr_set,
};

static const struct xattr_handler cifs_posix_acl_default_xattr_handler = {
	.name = XATTR_NAME_POSIX_ACL_DEFAULT,
	.flags = XATTR_ACL_DEFAULT,
	.get = cifs_xattr_get,
	.set = cifs_xattr_set,
};

const struct xattr_handler *cifs_xattr_handlers[] = {
	&cifs_user_xattr_handler,
	&cifs_os2_xattr_handler,
	&cifs_cifs_acl_xattr_handler,
	&smb3_acl_xattr_handler, /* alias for above since avoiding "cifs" */
	&cifs_cifs_ntsd_xattr_handler,
	&smb3_ntsd_xattr_handler, /* alias for above since avoiding "cifs" */
	&cifs_posix_acl_access_xattr_handler,
	&cifs_posix_acl_default_xattr_handler,
	NULL
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* fs/cifs/xattr.c
	3	*
79a58d1f	4	* Copyright (c) International Business Machines Corp., 2003, 2007
1da177e4 LT	5	* Author(s): Steve French (sfrench@us.ibm.com)
	6	*
	7	* This library is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU Lesser General Public License as published
	9	* by the Free Software Foundation; either version 2.1 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This library is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
	15	* the GNU Lesser General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU Lesser General Public License
	18	* along with this library; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*/
	21
	22	#include <linux/fs.h>
	23	#include <linux/posix_acl_xattr.h>
5a0e3ad6	24	#include <linux/slab.h>
f995e740	25	#include <linux/xattr.h>
1da177e4 LT	26	#include "cifsfs.h"
	27	#include "cifspdu.h"
	28	#include "cifsglob.h"
	29	#include "cifsproto.h"
	30	#include "cifs_debug.h"
2baa2682 SF	31	#include "cifs_fs_sb.h"
2baa2682 SF	32	#include "cifs_unicode.h"
1da177e4	33
63d37fb4	34	#define MAX_EA_VALUE_SIZE CIFSMaxBufSize
438471b6 BP	35	#define CIFS_XATTR_CIFS_ACL "system.cifs_acl" /* DACL only */
438471b6 BP	36	#define CIFS_XATTR_CIFS_NTSD "system.cifs_ntsd" /* owner plus DACL */
a958fff2	37	#define CIFS_XATTR_ATTRIB "cifs.dosattrib" /* full name: user.cifs.dosattrib */
66098044	38	#define CIFS_XATTR_CREATETIME "cifs.creationtime" /* user.cifs.creationtime */
c4f7173a SF	39	/*
	40	* Although these three are just aliases for the above, need to move away from
	41	* confusing users and using the 20+ year old term 'cifs' when it is no longer
	42	* secure, replaced by SMB2 (then even more highly secure SMB3) many years ago
	43	*/
438471b6 BP	44	#define SMB3_XATTR_CIFS_ACL "system.smb3_acl" /* DACL only */
438471b6 BP	45	#define SMB3_XATTR_CIFS_NTSD "system.smb3_ntsd" /* owner plus DACL */
c4f7173a SF	46	#define SMB3_XATTR_ATTRIB "smb3.dosattrib" /* full name: user.smb3.dosattrib */
c4f7173a SF	47	#define SMB3_XATTR_CREATETIME "smb3.creationtime" /* user.smb3.creationtime */
f995e740	48	/* BB need to add server (Samba e.g) support for security and trusted prefix */
1da177e4	49
438471b6 BP	50	enum { XATTR_USER, XATTR_CIFS_ACL, XATTR_ACL_ACCESS, XATTR_ACL_DEFAULT,
	51	XATTR_CIFS_NTSD };
	52
	53	static int cifs_attrib_set(unsigned int xid, struct cifs_tcon *pTcon,
	54	struct inode inode, char full_path,
	55	const void *value, size_t size)
	56	{
	57	ssize_t rc = -EOPNOTSUPP;
	58	__u32 pattrib = (__u32 )value;
	59	__u32 attrib;
	60	FILE_BASIC_INFO info_buf;
	61
	62	if ((value == NULL) \|\| (size != sizeof(__u32)))
	63	return -ERANGE;
	64
	65	memset(&info_buf, 0, sizeof(info_buf));
	66	attrib = *pattrib;
	67	info_buf.Attributes = cpu_to_le32(attrib);
	68	if (pTcon->ses->server->ops->set_file_info)
	69	rc = pTcon->ses->server->ops->set_file_info(inode, full_path,
	70	&info_buf, xid);
	71	if (rc == 0)
	72	CIFS_I(inode)->cifsAttrs = attrib;
	73
	74	return rc;
	75	}
	76
	77	static int cifs_creation_time_set(unsigned int xid, struct cifs_tcon *pTcon,
	78	struct inode inode, char full_path,
	79	const void *value, size_t size)
	80	{
	81	ssize_t rc = -EOPNOTSUPP;
	82	__u64 pcreation_time = (__u64 )value;
	83	__u64 creation_time;
	84	FILE_BASIC_INFO info_buf;
	85
	86	if ((value == NULL) \|\| (size != sizeof(__u64)))
	87	return -ERANGE;
	88
	89	memset(&info_buf, 0, sizeof(info_buf));
	90	creation_time = *pcreation_time;
	91	info_buf.CreationTime = cpu_to_le64(creation_time);
	92	if (pTcon->ses->server->ops->set_file_info)
	93	rc = pTcon->ses->server->ops->set_file_info(inode, full_path,
	94	&info_buf, xid);
	95	if (rc == 0)
	96	CIFS_I(inode)->createtime = creation_time;
	97
	98	return rc;
	99	}
7ffec372	100
a9ae008f	101	static int cifs_xattr_set(const struct xattr_handler *handler,
59301226 AV	102	struct dentry dentry, struct inode inode,
	103	const char name, const void value,
	104	size_t size, int flags)
1da177e4 LT	105	{
1da177e4 LT	106	int rc = -EOPNOTSUPP;
6d5786a3	107	unsigned int xid;
a9ae008f	108	struct super_block *sb = dentry->d_sb;
5fdccfef	109	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
7ffec372	110	struct tcon_link *tlink;
96daf2b0	111	struct cifs_tcon *pTcon;
79a58d1f	112	char *full_path;
1da177e4	113
7ffec372 JL	114	tlink = cifs_sb_tlink(cifs_sb);
	115	if (IS_ERR(tlink))
	116	return PTR_ERR(tlink);
	117	pTcon = tlink_tcon(tlink);
	118
6d5786a3	119	xid = get_xid();
1da177e4	120
a9ae008f	121	full_path = build_path_from_dentry(dentry);
79a58d1f	122	if (full_path == NULL) {
0f3bc09e	123	rc = -ENOMEM;
a9ae008f	124	goto out;
1da177e4 LT	125	}
	126	/* return dos attributes as pseudo xattr */
	127	/* return alt name if available as pseudo attr */
	128
	129	/* if proc/fs/cifs/streamstoxattr is set then
79a58d1f	130	search server for EAs or streams to
1da177e4	131	returns as xattrs */
a9ae008f	132	if (size > MAX_EA_VALUE_SIZE) {
f96637be	133	cifs_dbg(FYI, "size of EA value too large\n");
7ffec372	134	rc = -EOPNOTSUPP;
a9ae008f	135	goto out;
1da177e4 LT	136	}
1da177e4 LT	137
a9ae008f AG	138	switch (handler->flags) {
a9ae008f AG	139	case XATTR_USER:
438471b6 BP	140	cifs_dbg(FYI, "%s:setting user xattr %s\n", __func__, name);
	141	if ((strcmp(name, CIFS_XATTR_ATTRIB) == 0) \|\|
	142	(strcmp(name, SMB3_XATTR_ATTRIB) == 0)) {
	143	rc = cifs_attrib_set(xid, pTcon, inode, full_path,
	144	value, size);
	145	if (rc == 0) /* force revalidate of the inode */
	146	CIFS_I(inode)->time = 0;
	147	break;
	148	} else if ((strcmp(name, CIFS_XATTR_CREATETIME) == 0) \|\|
	149	(strcmp(name, SMB3_XATTR_CREATETIME) == 0)) {
	150	rc = cifs_creation_time_set(xid, pTcon, inode,
	151	full_path, value, size);
	152	if (rc == 0) /* force revalidate of the inode */
	153	CIFS_I(inode)->time = 0;
	154	break;
	155	}
	156
79a58d1f	157	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
a9ae008f	158	goto out;
ad7a2926	159
666753c3 SF	160	if (pTcon->ses->server->ops->set_EA)
666753c3 SF	161	rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
a9ae008f	162	full_path, name, value, (__u16)size,
5517554e	163	cifs_sb->local_nls, cifs_sb);
a9ae008f	164	break;
1da177e4	165
438471b6 BP	166	case XATTR_CIFS_ACL:
438471b6 BP	167	case XATTR_CIFS_NTSD: {
b0f8ef20	168	struct cifs_ntsd *pacl;
a9ae008f AG	169
	170	if (!value)
	171	goto out;
	172	pacl = kmalloc(size, GFP_KERNEL);
b73b9a4b	173	if (!pacl) {
b73b9a4b SF	174	rc = -ENOMEM;
b73b9a4b SF	175	} else {
a9ae008f AG	176	memcpy(pacl, value, size);
a9ae008f AG	177	if (value &&
438471b6 BP	178	pTcon->ses->server->ops->set_acl) {
	179	rc = 0;
	180	if (handler->flags == XATTR_CIFS_NTSD) {
	181	/* set owner and DACL */
	182	rc = pTcon->ses->server->ops->set_acl(
	183	pacl, size, inode,
	184	full_path,
	185	CIFS_ACL_OWNER);
	186	}
	187	if (rc == 0) {
	188	/* set DACL */
	189	rc = pTcon->ses->server->ops->set_acl(
	190	pacl, size, inode,
	191	full_path,
	192	CIFS_ACL_DACL);
	193	}
	194	} else {
83e3bc23	195	rc = -EOPNOTSUPP;
438471b6	196	}
b73b9a4b	197	if (rc == 0) /* force revalidate of the inode */
59301226	198	CIFS_I(inode)->time = 0;
b73b9a4b	199	kfree(pacl);
b0f8ef20	200	}
a9ae008f AG	201	break;
	202	}
	203
	204	case XATTR_ACL_ACCESS:
1da177e4	205	#ifdef CONFIG_CIFS_POSIX
a9ae008f AG	206	if (!value)
a9ae008f AG	207	goto out;
1751e8a6	208	if (sb->s_flags & SB_POSIXACL)
a9ae008f AG	209	rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
	210	value, (const int)size,
	211	ACL_TYPE_ACCESS, cifs_sb->local_nls,
	212	cifs_remap(cifs_sb));
	213	#endif /* CONFIG_CIFS_POSIX */
	214	break;
	215
	216	case XATTR_ACL_DEFAULT:
1da177e4	217	#ifdef CONFIG_CIFS_POSIX
a9ae008f AG	218	if (!value)
a9ae008f AG	219	goto out;
1751e8a6	220	if (sb->s_flags & SB_POSIXACL)
a9ae008f AG	221	rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
	222	value, (const int)size,
	223	ACL_TYPE_DEFAULT, cifs_sb->local_nls,
	224	cifs_remap(cifs_sb));
	225	#endif /* CONFIG_CIFS_POSIX */
	226	break;
1da177e4 LT	227	}
1da177e4 LT	228
a9ae008f	229	out:
f99d49ad	230	kfree(full_path);
6d5786a3	231	free_xid(xid);
7ffec372	232	cifs_put_tlink(tlink);
1da177e4 LT	233	return rc;
	234	}
	235
a958fff2 SF	236	static int cifs_attrib_get(struct dentry *dentry,
	237	struct inode inode, void value,
	238	size_t size)
	239	{
	240	ssize_t rc;
	241	__u32 *pattribute;
	242
	243	rc = cifs_revalidate_dentry_attr(dentry);
	244
	245	if (rc)
	246	return rc;
	247
	248	if ((value == NULL) \|\| (size == 0))
	249	return sizeof(__u32);
	250	else if (size < sizeof(__u32))
	251	return -ERANGE;
	252
	253	/* return dos attributes as pseudo xattr */
	254	pattribute = (__u32 *)value;
	255	*pattribute = CIFS_I(inode)->cifsAttrs;
	256
	257	return sizeof(__u32);
	258	}
	259
66098044 SF	260	static int cifs_creation_time_get(struct dentry dentry, struct inode inode,
	261	void *value, size_t size)
	262	{
	263	ssize_t rc;
438471b6	264	__u64 *pcreatetime;
66098044 SF	265
	266	rc = cifs_revalidate_dentry_attr(dentry);
	267	if (rc)
	268	return rc;
	269
	270	if ((value == NULL) \|\| (size == 0))
	271	return sizeof(__u64);
	272	else if (size < sizeof(__u64))
	273	return -ERANGE;
	274
	275	/* return dos attributes as pseudo xattr */
	276	pcreatetime = (__u64 *)value;
	277	*pcreatetime = CIFS_I(inode)->createtime;
	278	return sizeof(__u64);
66098044 SF	279	}
66098044 SF	280
a958fff2	281
a9ae008f AG	282	static int cifs_xattr_get(const struct xattr_handler *handler,
	283	struct dentry dentry, struct inode inode,
	284	const char name, void value, size_t size)
1da177e4 LT	285	{
1da177e4 LT	286	ssize_t rc = -EOPNOTSUPP;
6d5786a3	287	unsigned int xid;
a9ae008f	288	struct super_block *sb = dentry->d_sb;
5fdccfef	289	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
7ffec372	290	struct tcon_link *tlink;
96daf2b0	291	struct cifs_tcon *pTcon;
79a58d1f	292	char *full_path;
1da177e4	293
7ffec372 JL	294	tlink = cifs_sb_tlink(cifs_sb);
	295	if (IS_ERR(tlink))
	296	return PTR_ERR(tlink);
	297	pTcon = tlink_tcon(tlink);
	298
6d5786a3	299	xid = get_xid();
1da177e4	300
a9ae008f	301	full_path = build_path_from_dentry(dentry);
79a58d1f	302	if (full_path == NULL) {
0f3bc09e	303	rc = -ENOMEM;
a9ae008f	304	goto out;
1da177e4	305	}
a958fff2	306
1da177e4	307	/* return alt name if available as pseudo attr */
a9ae008f AG	308	switch (handler->flags) {
a9ae008f AG	309	case XATTR_USER:
a958fff2	310	cifs_dbg(FYI, "%s:querying user xattr %s\n", __func__, name);
c4f7173a SF	311	if ((strcmp(name, CIFS_XATTR_ATTRIB) == 0) \|\|
c4f7173a SF	312	(strcmp(name, SMB3_XATTR_ATTRIB) == 0)) {
a958fff2 SF	313	rc = cifs_attrib_get(dentry, inode, value, size);
a958fff2 SF	314	break;
c4f7173a SF	315	} else if ((strcmp(name, CIFS_XATTR_CREATETIME) == 0) \|\|
c4f7173a SF	316	(strcmp(name, SMB3_XATTR_CREATETIME) == 0)) {
66098044 SF	317	rc = cifs_creation_time_get(dentry, inode, value, size);
66098044 SF	318	break;
a958fff2 SF	319	}
a958fff2 SF	320
79a58d1f	321	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
a9ae008f	322	goto out;
1da177e4	323
666753c3 SF	324	if (pTcon->ses->server->ops->query_all_EAs)
666753c3 SF	325	rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
67b4c889	326	full_path, name, value, size, cifs_sb);
a9ae008f	327	break;
1da177e4	328
438471b6 BP	329	case XATTR_CIFS_ACL:
	330	case XATTR_CIFS_NTSD: {
	331	/* the whole ntsd is fetched regardless */
a9ae008f AG	332	u32 acllen;
	333	struct cifs_ntsd *pacl;
	334
	335	if (pTcon->ses->server->ops->get_acl == NULL)
	336	goto out; /* rc already EOPNOTSUPP */
	337
	338	pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
	339	inode, full_path, &acllen);
	340	if (IS_ERR(pacl)) {
	341	rc = PTR_ERR(pacl);
	342	cifs_dbg(VFS, "%s: error %zd getting sec desc\n",
	343	__func__, rc);
	344	} else {
	345	if (value) {
	346	if (acllen > size)
	347	acllen = -ERANGE;
	348	else
	349	memcpy(value, pacl, acllen);
	350	}
	351	rc = acllen;
	352	kfree(pacl);
	353	}
a9ae008f AG	354	break;
	355	}
	356
	357	case XATTR_ACL_ACCESS:
1da177e4	358	#ifdef CONFIG_CIFS_POSIX
1751e8a6	359	if (sb->s_flags & SB_POSIXACL)
1da0c78b	360	rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
a9ae008f	361	value, size, ACL_TYPE_ACCESS,
737b758c	362	cifs_sb->local_nls,
2baa2682	363	cifs_remap(cifs_sb));
a9ae008f AG	364	#endif /* CONFIG_CIFS_POSIX */
	365	break;
	366
	367	case XATTR_ACL_DEFAULT:
1da177e4	368	#ifdef CONFIG_CIFS_POSIX
1751e8a6	369	if (sb->s_flags & SB_POSIXACL)
1da0c78b	370	rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
a9ae008f	371	value, size, ACL_TYPE_DEFAULT,
737b758c	372	cifs_sb->local_nls,
2baa2682	373	cifs_remap(cifs_sb));
a9ae008f AG	374	#endif /* CONFIG_CIFS_POSIX */
	375	break;
	376	}
1da177e4	377
79a58d1f	378	/* We could add an additional check for streams ie
1da177e4	379	if proc/fs/cifs/streamstoxattr is set then
79a58d1f	380	search server for EAs or streams to
1da177e4 LT	381	returns as xattrs */
1da177e4 LT	382
79a58d1f SF	383	if (rc == -EINVAL)
79a58d1f SF	384	rc = -EOPNOTSUPP;
1da177e4	385
a9ae008f	386	out:
f99d49ad	387	kfree(full_path);
6d5786a3	388	free_xid(xid);
7ffec372	389	cifs_put_tlink(tlink);
1da177e4 LT	390	return rc;
	391	}
	392
79a58d1f	393	ssize_t cifs_listxattr(struct dentry direntry, char data, size_t buf_size)
1da177e4 LT	394	{
1da177e4 LT	395	ssize_t rc = -EOPNOTSUPP;
6d5786a3	396	unsigned int xid;
5fdccfef	397	struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
7ffec372	398	struct tcon_link *tlink;
96daf2b0	399	struct cifs_tcon *pTcon;
79a58d1f	400	char *full_path;
1da177e4	401
79a58d1f	402	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
ea4c07d7 SF	403	return -EOPNOTSUPP;
ea4c07d7 SF	404
7ffec372 JL	405	tlink = cifs_sb_tlink(cifs_sb);
	406	if (IS_ERR(tlink))
	407	return PTR_ERR(tlink);
	408	pTcon = tlink_tcon(tlink);
	409
6d5786a3	410	xid = get_xid();
ea4c07d7	411
1da177e4	412	full_path = build_path_from_dentry(direntry);
79a58d1f	413	if (full_path == NULL) {
0f3bc09e	414	rc = -ENOMEM;
7ffec372	415	goto list_ea_exit;
1da177e4 LT	416	}
	417	/* return dos attributes as pseudo xattr */
	418	/* return alt name if available as pseudo attr */
	419
	420	/* if proc/fs/cifs/streamstoxattr is set then
79a58d1f	421	search server for EAs or streams to
1da177e4	422	returns as xattrs */
1da177e4	423
666753c3 SF	424	if (pTcon->ses->server->ops->query_all_EAs)
666753c3 SF	425	rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
67b4c889	426	full_path, NULL, data, buf_size, cifs_sb);
7ffec372	427	list_ea_exit:
f99d49ad	428	kfree(full_path);
6d5786a3	429	free_xid(xid);
7ffec372	430	cifs_put_tlink(tlink);
1da177e4 LT	431	return rc;
1da177e4 LT	432	}
a9ae008f AG	433
	434	static const struct xattr_handler cifs_user_xattr_handler = {
	435	.prefix = XATTR_USER_PREFIX,
	436	.flags = XATTR_USER,
	437	.get = cifs_xattr_get,
	438	.set = cifs_xattr_set,
	439	};
	440
	441	/* os2.* attributes are treated like user.* attributes */
	442	static const struct xattr_handler cifs_os2_xattr_handler = {
	443	.prefix = XATTR_OS2_PREFIX,
	444	.flags = XATTR_USER,
	445	.get = cifs_xattr_get,
	446	.set = cifs_xattr_set,
	447	};
	448
	449	static const struct xattr_handler cifs_cifs_acl_xattr_handler = {
	450	.name = CIFS_XATTR_CIFS_ACL,
	451	.flags = XATTR_CIFS_ACL,
	452	.get = cifs_xattr_get,
	453	.set = cifs_xattr_set,
	454	};
	455
c4f7173a SF	456	/*
	457	* Although this is just an alias for the above, need to move away from
	458	* confusing users and using the 20 year old term 'cifs' when it is no
	459	* longer secure and was replaced by SMB2/SMB3 a long time ago, and
	460	* SMB3 and later are highly secure.
	461	*/
	462	static const struct xattr_handler smb3_acl_xattr_handler = {
	463	.name = SMB3_XATTR_CIFS_ACL,
	464	.flags = XATTR_CIFS_ACL,
	465	.get = cifs_xattr_get,
	466	.set = cifs_xattr_set,
	467	};
	468
438471b6 BP	469	static const struct xattr_handler cifs_cifs_ntsd_xattr_handler = {
	470	.name = CIFS_XATTR_CIFS_NTSD,
	471	.flags = XATTR_CIFS_NTSD,
	472	.get = cifs_xattr_get,
	473	.set = cifs_xattr_set,
	474	};
	475
	476	/*
	477	* Although this is just an alias for the above, need to move away from
	478	* confusing users and using the 20 year old term 'cifs' when it is no
	479	* longer secure and was replaced by SMB2/SMB3 a long time ago, and
	480	* SMB3 and later are highly secure.
	481	*/
	482	static const struct xattr_handler smb3_ntsd_xattr_handler = {
	483	.name = SMB3_XATTR_CIFS_NTSD,
	484	.flags = XATTR_CIFS_NTSD,
	485	.get = cifs_xattr_get,
	486	.set = cifs_xattr_set,
	487	};
	488
a9ae008f AG	489	static const struct xattr_handler cifs_posix_acl_access_xattr_handler = {
	490	.name = XATTR_NAME_POSIX_ACL_ACCESS,
	491	.flags = XATTR_ACL_ACCESS,
	492	.get = cifs_xattr_get,
	493	.set = cifs_xattr_set,
	494	};
	495
	496	static const struct xattr_handler cifs_posix_acl_default_xattr_handler = {
	497	.name = XATTR_NAME_POSIX_ACL_DEFAULT,
	498	.flags = XATTR_ACL_DEFAULT,
	499	.get = cifs_xattr_get,
	500	.set = cifs_xattr_set,
	501	};
	502
	503	const struct xattr_handler *cifs_xattr_handlers[] = {
	504	&cifs_user_xattr_handler,
	505	&cifs_os2_xattr_handler,
	506	&cifs_cifs_acl_xattr_handler,
c4f7173a	507	&smb3_acl_xattr_handler, /* alias for above since avoiding "cifs" */
438471b6 BP	508	&cifs_cifs_ntsd_xattr_handler,
438471b6 BP	509	&smb3_ntsd_xattr_handler, /* alias for above since avoiding "cifs" */
a9ae008f AG	510	&cifs_posix_acl_access_xattr_handler,
	511	&cifs_posix_acl_default_xattr_handler,
	512	NULL
	513	};