1 /* Kernel object name space definitions
2  *
3  * Copyright (c) 2002-2003 Patrick Mochel
4  * Copyright (c) 2002-2003 Open Source Development Labs
5  * Copyright (c) 2006-2008 Greg Kroah-Hartman <greg@kroah.com>
6  * Copyright (c) 2006-2008 Novell Inc.
7  *
8  * Split from kobject.h by David Howells (dhowells@redhat.com)
9  *
10  * This file is released under the GPLv2.
11  *
12  * Please read Documentation/kobject.txt before using the kobject
13  * interface, ESPECIALLY the parts about reference counts and object
14  * destructors.
15  */
16 
17 #ifndef _LINUX_KOBJECT_NS_H
18 #define _LINUX_KOBJECT_NS_H
19 
20 struct sock;
21 struct kobject;
22 
23 /*
24  * Namespace types which are used to tag kobjects and sysfs entries.
25  * Network namespace will likely be the first.
26  */
27 enum kobj_ns_type {
28 	KOBJ_NS_TYPE_NONE = 0,
29 	KOBJ_NS_TYPE_NET,
30 	KOBJ_NS_TYPES
31 };
32 
33 /*
34  * Callbacks so sysfs can determine namespaces
35  *   @grab_current_ns: return a new reference to calling task's namespace
36  *   @netlink_ns: return namespace to which a sock belongs (right?)
37  *   @initial_ns: return the initial namespace (i.e. init_net_ns)
38  *   @drop_ns: drops a reference to namespace
39  */
40 struct kobj_ns_type_operations {
41 	enum kobj_ns_type type;
42 	void *(*grab_current_ns)(void);
43 	const void *(*netlink_ns)(struct sock *sk);
44 	const void *(*initial_ns)(void);
45 	void (*drop_ns)(void *);
46 };
47 
48 int kobj_ns_type_register(const struct kobj_ns_type_operations *ops);
49 int kobj_ns_type_registered(enum kobj_ns_type type);
50 const struct kobj_ns_type_operations *kobj_child_ns_ops(struct kobject *parent);
51 const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj);
52 
53 void *kobj_ns_grab_current(enum kobj_ns_type type);
54 const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk);
55 const void *kobj_ns_initial(enum kobj_ns_type type);
56 void kobj_ns_drop(enum kobj_ns_type type, void *ns);
57 
58 #endif /* _LINUX_KOBJECT_NS_H */
59