Cedric Le Goater | acce292 | 2007-07-15 23:40:59 -0700 | [diff] [blame] | 1 | #ifndef _LINUX_USER_NAMESPACE_H |
| 2 | #define _LINUX_USER_NAMESPACE_H |
| 3 | |
| 4 | #include <linux/kref.h> |
| 5 | #include <linux/nsproxy.h> |
| 6 | #include <linux/sched.h> |
Serge E. Hallyn | 77ec739 | 2007-07-15 23:41:01 -0700 | [diff] [blame] | 7 | #include <linux/err.h> |
Cedric Le Goater | acce292 | 2007-07-15 23:40:59 -0700 | [diff] [blame] | 8 | |
Eric W. Biederman | 22d917d | 2011-11-17 00:11:58 -0800 | [diff] [blame] | 9 | #define UID_GID_MAP_MAX_EXTENTS 5 |
| 10 | |
| 11 | struct uid_gid_map { /* 64 bytes -- 1 cache line */ |
| 12 | u32 nr_extents; |
| 13 | struct uid_gid_extent { |
| 14 | u32 first; |
| 15 | u32 lower_first; |
| 16 | u32 count; |
| 17 | } extent[UID_GID_MAP_MAX_EXTENTS]; |
| 18 | }; |
| 19 | |
Cedric Le Goater | acce292 | 2007-07-15 23:40:59 -0700 | [diff] [blame] | 20 | struct user_namespace { |
Eric W. Biederman | 22d917d | 2011-11-17 00:11:58 -0800 | [diff] [blame] | 21 | struct uid_gid_map uid_map; |
| 22 | struct uid_gid_map gid_map; |
Cedric Le Goater | acce292 | 2007-07-15 23:40:59 -0700 | [diff] [blame] | 23 | struct kref kref; |
Eric W. Biederman | aeb3ae9 | 2011-11-16 21:59:43 -0800 | [diff] [blame] | 24 | struct user_namespace *parent; |
Eric W. Biederman | 783291e | 2011-11-17 01:32:59 -0800 | [diff] [blame] | 25 | kuid_t owner; |
| 26 | kgid_t group; |
Cedric Le Goater | acce292 | 2007-07-15 23:40:59 -0700 | [diff] [blame] | 27 | }; |
| 28 | |
| 29 | extern struct user_namespace init_user_ns; |
| 30 | |
| 31 | #ifdef CONFIG_USER_NS |
| 32 | |
| 33 | static inline struct user_namespace *get_user_ns(struct user_namespace *ns) |
| 34 | { |
| 35 | if (ns) |
| 36 | kref_get(&ns->kref); |
| 37 | return ns; |
| 38 | } |
| 39 | |
Serge Hallyn | 18b6e04 | 2008-10-15 16:38:45 -0500 | [diff] [blame] | 40 | extern int create_user_ns(struct cred *new); |
Cedric Le Goater | acce292 | 2007-07-15 23:40:59 -0700 | [diff] [blame] | 41 | extern void free_user_ns(struct kref *kref); |
| 42 | |
| 43 | static inline void put_user_ns(struct user_namespace *ns) |
| 44 | { |
| 45 | if (ns) |
| 46 | kref_put(&ns->kref, free_user_ns); |
| 47 | } |
| 48 | |
Eric W. Biederman | 22d917d | 2011-11-17 00:11:58 -0800 | [diff] [blame] | 49 | struct seq_operations; |
| 50 | extern struct seq_operations proc_uid_seq_operations; |
| 51 | extern struct seq_operations proc_gid_seq_operations; |
| 52 | extern ssize_t proc_uid_map_write(struct file *, const char __user *, size_t, loff_t *); |
| 53 | extern ssize_t proc_gid_map_write(struct file *, const char __user *, size_t, loff_t *); |
Cedric Le Goater | acce292 | 2007-07-15 23:40:59 -0700 | [diff] [blame] | 54 | #else |
| 55 | |
| 56 | static inline struct user_namespace *get_user_ns(struct user_namespace *ns) |
| 57 | { |
| 58 | return &init_user_ns; |
| 59 | } |
| 60 | |
Serge Hallyn | 18b6e04 | 2008-10-15 16:38:45 -0500 | [diff] [blame] | 61 | static inline int create_user_ns(struct cred *new) |
Cedric Le Goater | acce292 | 2007-07-15 23:40:59 -0700 | [diff] [blame] | 62 | { |
Serge Hallyn | 18b6e04 | 2008-10-15 16:38:45 -0500 | [diff] [blame] | 63 | return -EINVAL; |
Cedric Le Goater | acce292 | 2007-07-15 23:40:59 -0700 | [diff] [blame] | 64 | } |
| 65 | |
| 66 | static inline void put_user_ns(struct user_namespace *ns) |
| 67 | { |
| 68 | } |
| 69 | |
Eric W. Biederman | 22d917d | 2011-11-17 00:11:58 -0800 | [diff] [blame] | 70 | #endif |
| 71 | |
Cedric Le Goater | acce292 | 2007-07-15 23:40:59 -0700 | [diff] [blame] | 72 | #endif /* _LINUX_USER_H */ |