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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 File: linux/xattr.h
4
5 Extended attributes handling.
6
7 Copyright (C) 2001 by Andreas Gruenbacher <a.gruenbacher@computer.org>
8 Copyright (c) 2001-2002 Silicon Graphics, Inc. All Rights Reserved.
9 Copyright (c) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
10*/
11#ifndef _LINUX_XATTR_H
12#define _LINUX_XATTR_H
13
14
15#include <linux/slab.h>
16#include <linux/types.h>
17#include <linux/spinlock.h>
18#include <linux/mm.h>
19#include <uapi/linux/xattr.h>
20
21struct inode;
22struct dentry;
23
24/*
25 * struct xattr_handler: When @name is set, match attributes with exactly that
26 * name. When @prefix is set instead, match attributes with that prefix and
27 * with a non-empty suffix.
28 */
29struct xattr_handler {
30 const char *name;
31 const char *prefix;
32 int flags; /* fs private flags */
33 bool (*list)(struct dentry *dentry);
34 int (*get)(const struct xattr_handler *, struct dentry *dentry,
35 struct inode *inode, const char *name, void *buffer,
36 size_t size);
37 int (*set)(const struct xattr_handler *, struct dentry *dentry,
38 struct inode *inode, const char *name, const void *buffer,
39 size_t size, int flags);
40};
41
42const char *xattr_full_name(const struct xattr_handler *, const char *);
43
44struct xattr {
45 const char *name;
46 void *value;
47 size_t value_len;
48};
49
50ssize_t __vfs_getxattr(struct dentry *, struct inode *, const char *, void *, size_t);
51ssize_t vfs_getxattr(struct dentry *, const char *, void *, size_t);
52ssize_t vfs_listxattr(struct dentry *d, char *list, size_t size);
53int __vfs_setxattr(struct dentry *, struct inode *, const char *, const void *, size_t, int);
54int __vfs_setxattr_noperm(struct dentry *, const char *, const void *, size_t, int);
55int __vfs_setxattr_locked(struct dentry *, const char *, const void *, size_t, int, struct inode **);
56int vfs_setxattr(struct dentry *, const char *, const void *, size_t, int);
57int __vfs_removexattr(struct dentry *, const char *);
58int __vfs_removexattr_locked(struct dentry *, const char *, struct inode **);
59int vfs_removexattr(struct dentry *, const char *);
60
61ssize_t generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size);
62ssize_t vfs_getxattr_alloc(struct dentry *dentry, const char *name,
63 char **xattr_value, size_t size, gfp_t flags);
64
65int xattr_supported_namespace(struct inode *inode, const char *prefix);
66
67static inline const char *xattr_prefix(const struct xattr_handler *handler)
68{
69 return handler->prefix ?: handler->name;
70}
71
72struct simple_xattrs {
73 struct list_head head;
74 spinlock_t lock;
75};
76
77struct simple_xattr {
78 struct list_head list;
79 char *name;
80 size_t size;
81 char value[];
82};
83
84/*
85 * initialize the simple_xattrs structure
86 */
87static inline void simple_xattrs_init(struct simple_xattrs *xattrs)
88{
89 INIT_LIST_HEAD(&xattrs->head);
90 spin_lock_init(&xattrs->lock);
91}
92
93/*
94 * free all the xattrs
95 */
96static inline void simple_xattrs_free(struct simple_xattrs *xattrs)
97{
98 struct simple_xattr *xattr, *node;
99
100 list_for_each_entry_safe(xattr, node, &xattrs->head, list) {
101 kfree(xattr->name);
102 kvfree(xattr);
103 }
104}
105
106struct simple_xattr *simple_xattr_alloc(const void *value, size_t size);
107int simple_xattr_get(struct simple_xattrs *xattrs, const char *name,
108 void *buffer, size_t size);
109int simple_xattr_set(struct simple_xattrs *xattrs, const char *name,
110 const void *value, size_t size, int flags,
111 ssize_t *removed_size);
112ssize_t simple_xattr_list(struct inode *inode, struct simple_xattrs *xattrs, char *buffer,
113 size_t size);
114void simple_xattr_list_add(struct simple_xattrs *xattrs,
115 struct simple_xattr *new_xattr);
116
117#endif /* _LINUX_XATTR_H */
1/*
2 File: linux/xattr.h
3
4 Extended attributes handling.
5
6 Copyright (C) 2001 by Andreas Gruenbacher <a.gruenbacher@computer.org>
7 Copyright (c) 2001-2002 Silicon Graphics, Inc. All Rights Reserved.
8 Copyright (c) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
9*/
10#ifndef _LINUX_XATTR_H
11#define _LINUX_XATTR_H
12
13#define XATTR_CREATE 0x1 /* set value, fail if attr already exists */
14#define XATTR_REPLACE 0x2 /* set value, fail if attr does not exist */
15
16/* Namespaces */
17#define XATTR_OS2_PREFIX "os2."
18#define XATTR_OS2_PREFIX_LEN (sizeof (XATTR_OS2_PREFIX) - 1)
19
20#define XATTR_SECURITY_PREFIX "security."
21#define XATTR_SECURITY_PREFIX_LEN (sizeof (XATTR_SECURITY_PREFIX) - 1)
22
23#define XATTR_SYSTEM_PREFIX "system."
24#define XATTR_SYSTEM_PREFIX_LEN (sizeof (XATTR_SYSTEM_PREFIX) - 1)
25
26#define XATTR_TRUSTED_PREFIX "trusted."
27#define XATTR_TRUSTED_PREFIX_LEN (sizeof (XATTR_TRUSTED_PREFIX) - 1)
28
29#define XATTR_USER_PREFIX "user."
30#define XATTR_USER_PREFIX_LEN (sizeof (XATTR_USER_PREFIX) - 1)
31
32/* Security namespace */
33#define XATTR_SELINUX_SUFFIX "selinux"
34#define XATTR_NAME_SELINUX XATTR_SECURITY_PREFIX XATTR_SELINUX_SUFFIX
35
36#define XATTR_SMACK_SUFFIX "SMACK64"
37#define XATTR_SMACK_IPIN "SMACK64IPIN"
38#define XATTR_SMACK_IPOUT "SMACK64IPOUT"
39#define XATTR_SMACK_EXEC "SMACK64EXEC"
40#define XATTR_SMACK_TRANSMUTE "SMACK64TRANSMUTE"
41#define XATTR_SMACK_MMAP "SMACK64MMAP"
42#define XATTR_NAME_SMACK XATTR_SECURITY_PREFIX XATTR_SMACK_SUFFIX
43#define XATTR_NAME_SMACKIPIN XATTR_SECURITY_PREFIX XATTR_SMACK_IPIN
44#define XATTR_NAME_SMACKIPOUT XATTR_SECURITY_PREFIX XATTR_SMACK_IPOUT
45#define XATTR_NAME_SMACKEXEC XATTR_SECURITY_PREFIX XATTR_SMACK_EXEC
46#define XATTR_NAME_SMACKTRANSMUTE XATTR_SECURITY_PREFIX XATTR_SMACK_TRANSMUTE
47#define XATTR_NAME_SMACKMMAP XATTR_SECURITY_PREFIX XATTR_SMACK_MMAP
48
49#define XATTR_CAPS_SUFFIX "capability"
50#define XATTR_NAME_CAPS XATTR_SECURITY_PREFIX XATTR_CAPS_SUFFIX
51
52#ifdef __KERNEL__
53
54#include <linux/types.h>
55
56struct inode;
57struct dentry;
58
59struct xattr_handler {
60 const char *prefix;
61 int flags; /* fs private flags passed back to the handlers */
62 size_t (*list)(struct dentry *dentry, char *list, size_t list_size,
63 const char *name, size_t name_len, int handler_flags);
64 int (*get)(struct dentry *dentry, const char *name, void *buffer,
65 size_t size, int handler_flags);
66 int (*set)(struct dentry *dentry, const char *name, const void *buffer,
67 size_t size, int flags, int handler_flags);
68};
69
70ssize_t xattr_getsecurity(struct inode *, const char *, void *, size_t);
71ssize_t vfs_getxattr(struct dentry *, const char *, void *, size_t);
72ssize_t vfs_listxattr(struct dentry *d, char *list, size_t size);
73int __vfs_setxattr_noperm(struct dentry *, const char *, const void *, size_t, int);
74int vfs_setxattr(struct dentry *, const char *, const void *, size_t, int);
75int vfs_removexattr(struct dentry *, const char *);
76
77ssize_t generic_getxattr(struct dentry *dentry, const char *name, void *buffer, size_t size);
78ssize_t generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size);
79int generic_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags);
80int generic_removexattr(struct dentry *dentry, const char *name);
81
82#endif /* __KERNEL__ */
83
84#endif /* _LINUX_XATTR_H */