1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* Kernel object name space definitions |
3 | * |
4 | * Copyright (c) 2002-2003 Patrick Mochel |
5 | * Copyright (c) 2002-2003 Open Source Development Labs |
6 | * Copyright (c) 2006-2008 Greg Kroah-Hartman <greg@kroah.com> |
7 | * Copyright (c) 2006-2008 Novell Inc. |
8 | * |
9 | * Split from kobject.h by David Howells (dhowells@redhat.com) |
10 | * |
11 | * Please read Documentation/core-api/kobject.rst before using the kobject |
12 | * interface, ESPECIALLY the parts about reference counts and object |
13 | * destructors. |
14 | */ |
15 | |
16 | #ifndef _LINUX_KOBJECT_NS_H |
17 | #define _LINUX_KOBJECT_NS_H |
18 | |
19 | struct sock; |
20 | struct kobject; |
21 | |
22 | /* |
23 | * Namespace types which are used to tag kobjects and sysfs entries. |
24 | * Network namespace will likely be the first. |
25 | */ |
26 | enum kobj_ns_type { |
27 | KOBJ_NS_TYPE_NONE = 0, |
28 | KOBJ_NS_TYPE_NET, |
29 | KOBJ_NS_TYPES |
30 | }; |
31 | |
32 | /* |
33 | * Callbacks so sysfs can determine namespaces |
34 | * @grab_current_ns: return a new reference to calling task's namespace |
35 | * @netlink_ns: return namespace to which a sock belongs (right?) |
36 | * @initial_ns: return the initial namespace (i.e. init_net_ns) |
37 | * @drop_ns: drops a reference to namespace |
38 | */ |
39 | struct kobj_ns_type_operations { |
40 | enum kobj_ns_type type; |
41 | bool (*current_may_mount)(void); |
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(const struct kobject *parent); |
51 | const struct kobj_ns_type_operations *kobj_ns_ops(const struct kobject *kobj); |
52 | |
53 | bool kobj_ns_current_may_mount(enum kobj_ns_type type); |
54 | void *kobj_ns_grab_current(enum kobj_ns_type type); |
55 | const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk); |
56 | const void *kobj_ns_initial(enum kobj_ns_type type); |
57 | void kobj_ns_drop(enum kobj_ns_type type, void *ns); |
58 | |
59 | #endif /* _LINUX_KOBJECT_NS_H */ |
60 | |