[thirdparty/linux.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 65535
#define CIFS_XATTR_CIFS_ACL "system.cifs_acl"
#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"
#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 };

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:
		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: {
#ifdef CONFIG_CIFS_ACL
		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 = 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);
		}
#endif /* CONFIG_CIFS_ACL */
		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: {
#ifdef CONFIG_CIFS_ACL
		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);
		}
#endif  /* CONFIG_CIFS_ACL */
		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_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_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 LT	33
1da177e4 LT	34	#define MAX_EA_VALUE_SIZE 65535
fbeba8bb	35	#define CIFS_XATTR_CIFS_ACL "system.cifs_acl"
a958fff2	36	#define CIFS_XATTR_ATTRIB "cifs.dosattrib" /* full name: user.cifs.dosattrib */
66098044	37	#define CIFS_XATTR_CREATETIME "cifs.creationtime" /* user.cifs.creationtime */
c4f7173a SF	38	/*
	39	* Although these three are just aliases for the above, need to move away from
	40	* confusing users and using the 20+ year old term 'cifs' when it is no longer
	41	* secure, replaced by SMB2 (then even more highly secure SMB3) many years ago
	42	*/
	43	#define SMB3_XATTR_CIFS_ACL "system.smb3_acl"
	44	#define SMB3_XATTR_ATTRIB "smb3.dosattrib" /* full name: user.smb3.dosattrib */
	45	#define SMB3_XATTR_CREATETIME "smb3.creationtime" /* user.smb3.creationtime */
f995e740	46	/* BB need to add server (Samba e.g) support for security and trusted prefix */
1da177e4	47
a9ae008f	48	enum { XATTR_USER, XATTR_CIFS_ACL, XATTR_ACL_ACCESS, XATTR_ACL_DEFAULT };
7ffec372	49
a9ae008f	50	static int cifs_xattr_set(const struct xattr_handler *handler,
59301226 AV	51	struct dentry dentry, struct inode inode,
	52	const char name, const void value,
	53	size_t size, int flags)
1da177e4 LT	54	{
1da177e4 LT	55	int rc = -EOPNOTSUPP;
6d5786a3	56	unsigned int xid;
a9ae008f	57	struct super_block *sb = dentry->d_sb;
5fdccfef	58	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
7ffec372	59	struct tcon_link *tlink;
96daf2b0	60	struct cifs_tcon *pTcon;
79a58d1f	61	char *full_path;
1da177e4	62
7ffec372 JL	63	tlink = cifs_sb_tlink(cifs_sb);
	64	if (IS_ERR(tlink))
	65	return PTR_ERR(tlink);
	66	pTcon = tlink_tcon(tlink);
	67
6d5786a3	68	xid = get_xid();
1da177e4	69
a9ae008f	70	full_path = build_path_from_dentry(dentry);
79a58d1f	71	if (full_path == NULL) {
0f3bc09e	72	rc = -ENOMEM;
a9ae008f	73	goto out;
1da177e4 LT	74	}
	75	/* return dos attributes as pseudo xattr */
	76	/* return alt name if available as pseudo attr */
	77
	78	/* if proc/fs/cifs/streamstoxattr is set then
79a58d1f	79	search server for EAs or streams to
1da177e4	80	returns as xattrs */
a9ae008f	81	if (size > MAX_EA_VALUE_SIZE) {
f96637be	82	cifs_dbg(FYI, "size of EA value too large\n");
7ffec372	83	rc = -EOPNOTSUPP;
a9ae008f	84	goto out;
1da177e4 LT	85	}
1da177e4 LT	86
a9ae008f AG	87	switch (handler->flags) {
a9ae008f AG	88	case XATTR_USER:
79a58d1f	89	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
a9ae008f	90	goto out;
ad7a2926	91
666753c3 SF	92	if (pTcon->ses->server->ops->set_EA)
666753c3 SF	93	rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
a9ae008f	94	full_path, name, value, (__u16)size,
5517554e	95	cifs_sb->local_nls, cifs_sb);
a9ae008f	96	break;
1da177e4	97
a9ae008f	98	case XATTR_CIFS_ACL: {
b0f8ef20 SN	99	#ifdef CONFIG_CIFS_ACL
b0f8ef20 SN	100	struct cifs_ntsd *pacl;
a9ae008f AG	101
	102	if (!value)
	103	goto out;
	104	pacl = kmalloc(size, GFP_KERNEL);
b73b9a4b	105	if (!pacl) {
b73b9a4b SF	106	rc = -ENOMEM;
b73b9a4b SF	107	} else {
a9ae008f AG	108	memcpy(pacl, value, size);
	109	if (value &&
	110	pTcon->ses->server->ops->set_acl)
83e3bc23	111	rc = pTcon->ses->server->ops->set_acl(pacl,
59301226	112	size, inode,
83e3bc23 SF	113	full_path, CIFS_ACL_DACL);
	114	else
	115	rc = -EOPNOTSUPP;
b73b9a4b	116	if (rc == 0) /* force revalidate of the inode */
59301226	117	CIFS_I(inode)->time = 0;
b73b9a4b	118	kfree(pacl);
b0f8ef20	119	}
b73b9a4b	120	#endif /* CONFIG_CIFS_ACL */
a9ae008f AG	121	break;
	122	}
	123
	124	case XATTR_ACL_ACCESS:
1da177e4	125	#ifdef CONFIG_CIFS_POSIX
a9ae008f AG	126	if (!value)
a9ae008f AG	127	goto out;
1751e8a6	128	if (sb->s_flags & SB_POSIXACL)
a9ae008f AG	129	rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
	130	value, (const int)size,
	131	ACL_TYPE_ACCESS, cifs_sb->local_nls,
	132	cifs_remap(cifs_sb));
	133	#endif /* CONFIG_CIFS_POSIX */
	134	break;
	135
	136	case XATTR_ACL_DEFAULT:
1da177e4	137	#ifdef CONFIG_CIFS_POSIX
a9ae008f AG	138	if (!value)
a9ae008f AG	139	goto out;
1751e8a6	140	if (sb->s_flags & SB_POSIXACL)
a9ae008f AG	141	rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
	142	value, (const int)size,
	143	ACL_TYPE_DEFAULT, cifs_sb->local_nls,
	144	cifs_remap(cifs_sb));
	145	#endif /* CONFIG_CIFS_POSIX */
	146	break;
1da177e4 LT	147	}
1da177e4 LT	148
a9ae008f	149	out:
f99d49ad	150	kfree(full_path);
6d5786a3	151	free_xid(xid);
7ffec372	152	cifs_put_tlink(tlink);
1da177e4 LT	153	return rc;
	154	}
	155
a958fff2 SF	156	static int cifs_attrib_get(struct dentry *dentry,
	157	struct inode inode, void value,
	158	size_t size)
	159	{
	160	ssize_t rc;
	161	__u32 *pattribute;
	162
	163	rc = cifs_revalidate_dentry_attr(dentry);
	164
	165	if (rc)
	166	return rc;
	167
	168	if ((value == NULL) \|\| (size == 0))
	169	return sizeof(__u32);
	170	else if (size < sizeof(__u32))
	171	return -ERANGE;
	172
	173	/* return dos attributes as pseudo xattr */
	174	pattribute = (__u32 *)value;
	175	*pattribute = CIFS_I(inode)->cifsAttrs;
	176
	177	return sizeof(__u32);
	178	}
	179
66098044 SF	180	static int cifs_creation_time_get(struct dentry dentry, struct inode inode,
	181	void *value, size_t size)
	182	{
	183	ssize_t rc;
	184	__u64 * pcreatetime;
	185
	186	rc = cifs_revalidate_dentry_attr(dentry);
	187	if (rc)
	188	return rc;
	189
	190	if ((value == NULL) \|\| (size == 0))
	191	return sizeof(__u64);
	192	else if (size < sizeof(__u64))
	193	return -ERANGE;
	194
	195	/* return dos attributes as pseudo xattr */
	196	pcreatetime = (__u64 *)value;
	197	*pcreatetime = CIFS_I(inode)->createtime;
	198	return sizeof(__u64);
66098044 SF	199	}
66098044 SF	200
a958fff2	201
a9ae008f AG	202	static int cifs_xattr_get(const struct xattr_handler *handler,
	203	struct dentry dentry, struct inode inode,
	204	const char name, void value, size_t size)
1da177e4 LT	205	{
1da177e4 LT	206	ssize_t rc = -EOPNOTSUPP;
6d5786a3	207	unsigned int xid;
a9ae008f	208	struct super_block *sb = dentry->d_sb;
5fdccfef	209	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
7ffec372	210	struct tcon_link *tlink;
96daf2b0	211	struct cifs_tcon *pTcon;
79a58d1f	212	char *full_path;
1da177e4	213
7ffec372 JL	214	tlink = cifs_sb_tlink(cifs_sb);
	215	if (IS_ERR(tlink))
	216	return PTR_ERR(tlink);
	217	pTcon = tlink_tcon(tlink);
	218
6d5786a3	219	xid = get_xid();
1da177e4	220
a9ae008f	221	full_path = build_path_from_dentry(dentry);
79a58d1f	222	if (full_path == NULL) {
0f3bc09e	223	rc = -ENOMEM;
a9ae008f	224	goto out;
1da177e4	225	}
a958fff2	226
1da177e4	227	/* return alt name if available as pseudo attr */
a9ae008f AG	228	switch (handler->flags) {
a9ae008f AG	229	case XATTR_USER:
a958fff2	230	cifs_dbg(FYI, "%s:querying user xattr %s\n", __func__, name);
c4f7173a SF	231	if ((strcmp(name, CIFS_XATTR_ATTRIB) == 0) \|\|
c4f7173a SF	232	(strcmp(name, SMB3_XATTR_ATTRIB) == 0)) {
a958fff2 SF	233	rc = cifs_attrib_get(dentry, inode, value, size);
a958fff2 SF	234	break;
c4f7173a SF	235	} else if ((strcmp(name, CIFS_XATTR_CREATETIME) == 0) \|\|
c4f7173a SF	236	(strcmp(name, SMB3_XATTR_CREATETIME) == 0)) {
66098044 SF	237	rc = cifs_creation_time_get(dentry, inode, value, size);
66098044 SF	238	break;
a958fff2 SF	239	}
a958fff2 SF	240
79a58d1f	241	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
a9ae008f	242	goto out;
1da177e4	243
666753c3 SF	244	if (pTcon->ses->server->ops->query_all_EAs)
666753c3 SF	245	rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
67b4c889	246	full_path, name, value, size, cifs_sb);
a9ae008f	247	break;
1da177e4	248
a9ae008f AG	249	case XATTR_CIFS_ACL: {
	250	#ifdef CONFIG_CIFS_ACL
	251	u32 acllen;
	252	struct cifs_ntsd *pacl;
	253
	254	if (pTcon->ses->server->ops->get_acl == NULL)
	255	goto out; /* rc already EOPNOTSUPP */
	256
	257	pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
	258	inode, full_path, &acllen);
	259	if (IS_ERR(pacl)) {
	260	rc = PTR_ERR(pacl);
	261	cifs_dbg(VFS, "%s: error %zd getting sec desc\n",
	262	__func__, rc);
	263	} else {
	264	if (value) {
	265	if (acllen > size)
	266	acllen = -ERANGE;
	267	else
	268	memcpy(value, pacl, acllen);
	269	}
	270	rc = acllen;
	271	kfree(pacl);
	272	}
	273	#endif /* CONFIG_CIFS_ACL */
	274	break;
	275	}
	276
	277	case XATTR_ACL_ACCESS:
1da177e4	278	#ifdef CONFIG_CIFS_POSIX
1751e8a6	279	if (sb->s_flags & SB_POSIXACL)
1da0c78b	280	rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
a9ae008f	281	value, size, ACL_TYPE_ACCESS,
737b758c	282	cifs_sb->local_nls,
2baa2682	283	cifs_remap(cifs_sb));
a9ae008f AG	284	#endif /* CONFIG_CIFS_POSIX */
	285	break;
	286
	287	case XATTR_ACL_DEFAULT:
1da177e4	288	#ifdef CONFIG_CIFS_POSIX
1751e8a6	289	if (sb->s_flags & SB_POSIXACL)
1da0c78b	290	rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
a9ae008f	291	value, size, ACL_TYPE_DEFAULT,
737b758c	292	cifs_sb->local_nls,
2baa2682	293	cifs_remap(cifs_sb));
a9ae008f AG	294	#endif /* CONFIG_CIFS_POSIX */
	295	break;
	296	}
1da177e4	297
79a58d1f	298	/* We could add an additional check for streams ie
1da177e4	299	if proc/fs/cifs/streamstoxattr is set then
79a58d1f	300	search server for EAs or streams to
1da177e4 LT	301	returns as xattrs */
1da177e4 LT	302
79a58d1f SF	303	if (rc == -EINVAL)
79a58d1f SF	304	rc = -EOPNOTSUPP;
1da177e4	305
a9ae008f	306	out:
f99d49ad	307	kfree(full_path);
6d5786a3	308	free_xid(xid);
7ffec372	309	cifs_put_tlink(tlink);
1da177e4 LT	310	return rc;
	311	}
	312
79a58d1f	313	ssize_t cifs_listxattr(struct dentry direntry, char data, size_t buf_size)
1da177e4 LT	314	{
1da177e4 LT	315	ssize_t rc = -EOPNOTSUPP;
6d5786a3	316	unsigned int xid;
5fdccfef	317	struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
7ffec372	318	struct tcon_link *tlink;
96daf2b0	319	struct cifs_tcon *pTcon;
79a58d1f	320	char *full_path;
1da177e4	321
79a58d1f	322	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
ea4c07d7 SF	323	return -EOPNOTSUPP;
ea4c07d7 SF	324
7ffec372 JL	325	tlink = cifs_sb_tlink(cifs_sb);
	326	if (IS_ERR(tlink))
	327	return PTR_ERR(tlink);
	328	pTcon = tlink_tcon(tlink);
	329
6d5786a3	330	xid = get_xid();
ea4c07d7	331
1da177e4	332	full_path = build_path_from_dentry(direntry);
79a58d1f	333	if (full_path == NULL) {
0f3bc09e	334	rc = -ENOMEM;
7ffec372	335	goto list_ea_exit;
1da177e4 LT	336	}
	337	/* return dos attributes as pseudo xattr */
	338	/* return alt name if available as pseudo attr */
	339
	340	/* if proc/fs/cifs/streamstoxattr is set then
79a58d1f	341	search server for EAs or streams to
1da177e4	342	returns as xattrs */
1da177e4	343
666753c3 SF	344	if (pTcon->ses->server->ops->query_all_EAs)
666753c3 SF	345	rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
67b4c889	346	full_path, NULL, data, buf_size, cifs_sb);
7ffec372	347	list_ea_exit:
f99d49ad	348	kfree(full_path);
6d5786a3	349	free_xid(xid);
7ffec372	350	cifs_put_tlink(tlink);
1da177e4 LT	351	return rc;
1da177e4 LT	352	}
a9ae008f AG	353
	354	static const struct xattr_handler cifs_user_xattr_handler = {
	355	.prefix = XATTR_USER_PREFIX,
	356	.flags = XATTR_USER,
	357	.get = cifs_xattr_get,
	358	.set = cifs_xattr_set,
	359	};
	360
	361	/* os2.* attributes are treated like user.* attributes */
	362	static const struct xattr_handler cifs_os2_xattr_handler = {
	363	.prefix = XATTR_OS2_PREFIX,
	364	.flags = XATTR_USER,
	365	.get = cifs_xattr_get,
	366	.set = cifs_xattr_set,
	367	};
	368
	369	static const struct xattr_handler cifs_cifs_acl_xattr_handler = {
	370	.name = CIFS_XATTR_CIFS_ACL,
	371	.flags = XATTR_CIFS_ACL,
	372	.get = cifs_xattr_get,
	373	.set = cifs_xattr_set,
	374	};
	375
c4f7173a SF	376	/*
	377	* Although this is just an alias for the above, need to move away from
	378	* confusing users and using the 20 year old term 'cifs' when it is no
	379	* longer secure and was replaced by SMB2/SMB3 a long time ago, and
	380	* SMB3 and later are highly secure.
	381	*/
	382	static const struct xattr_handler smb3_acl_xattr_handler = {
	383	.name = SMB3_XATTR_CIFS_ACL,
	384	.flags = XATTR_CIFS_ACL,
	385	.get = cifs_xattr_get,
	386	.set = cifs_xattr_set,
	387	};
	388
a9ae008f AG	389	static const struct xattr_handler cifs_posix_acl_access_xattr_handler = {
	390	.name = XATTR_NAME_POSIX_ACL_ACCESS,
	391	.flags = XATTR_ACL_ACCESS,
	392	.get = cifs_xattr_get,
	393	.set = cifs_xattr_set,
	394	};
	395
	396	static const struct xattr_handler cifs_posix_acl_default_xattr_handler = {
	397	.name = XATTR_NAME_POSIX_ACL_DEFAULT,
	398	.flags = XATTR_ACL_DEFAULT,
	399	.get = cifs_xattr_get,
	400	.set = cifs_xattr_set,
	401	};
	402
	403	const struct xattr_handler *cifs_xattr_handlers[] = {
	404	&cifs_user_xattr_handler,
	405	&cifs_os2_xattr_handler,
	406	&cifs_cifs_acl_xattr_handler,
c4f7173a	407	&smb3_acl_xattr_handler, /* alias for above since avoiding "cifs" */
a9ae008f AG	408	&cifs_posix_acl_access_xattr_handler,
	409	&cifs_posix_acl_default_xattr_handler,
	410	NULL
	411	};