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 <[email protected]> 7 * Copyright (c) 2006-2008 Novell Inc. 8 * 9 * Split from kobject.h by David Howells ([email protected]) 10 * 11 * This file is released under the GPLv2. 12 * 13 * Please read Documentation/kobject.txt before using the kobject 14 * interface, ESPECIALLY the parts about reference counts and object 15 * destructors. 16 */ 17 18 #ifndef _LINUX_KOBJECT_NS_H 19 #define _LINUX_KOBJECT_NS_H 20 21 struct sock; 22 struct kobject; 23 24 /* 25 * Namespace types which are used to tag kobjects and sysfs entries. 26 * Network namespace will likely be the first. 27 */ 28 enum kobj_ns_type { 29 KOBJ_NS_TYPE_NONE = 0, 30 KOBJ_NS_TYPE_NET, 31 KOBJ_NS_TYPES 32 }; 33 34 /* 35 * Callbacks so sysfs can determine namespaces 36 * @grab_current_ns: return a new reference to calling task's namespace 37 * @netlink_ns: return namespace to which a sock belongs (right?) 38 * @initial_ns: return the initial namespace (i.e. init_net_ns) 39 * @drop_ns: drops a reference to namespace 40 */ 41 struct kobj_ns_type_operations { 42 enum kobj_ns_type type; 43 bool (*current_may_mount)(void); 44 void *(*grab_current_ns)(void); 45 const void *(*netlink_ns)(struct sock *sk); 46 const void *(*initial_ns)(void); 47 void (*drop_ns)(void *); 48 }; 49 50 int kobj_ns_type_register(const struct kobj_ns_type_operations *ops); 51 int kobj_ns_type_registered(enum kobj_ns_type type); 52 const struct kobj_ns_type_operations *kobj_child_ns_ops(struct kobject *parent); 53 const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj); 54 55 bool kobj_ns_current_may_mount(enum kobj_ns_type type); 56 void *kobj_ns_grab_current(enum kobj_ns_type type); 57 const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk); 58 const void *kobj_ns_initial(enum kobj_ns_type type); 59 void kobj_ns_drop(enum kobj_ns_type type, void *ns); 60 61 #endif /* _LINUX_KOBJECT_NS_H */ 62