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(struct kobject *parent); 51 const struct kobj_ns_type_operations *kobj_ns_ops(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