Commit | Line | Data |
---|---|---|
acce292c CLG |
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> | |
77ec739d | 7 | #include <linux/err.h> |
acce292c | 8 | |
22d917d8 EB |
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 | ||
acce292c | 20 | struct user_namespace { |
22d917d8 EB |
21 | struct uid_gid_map uid_map; |
22 | struct uid_gid_map gid_map; | |
f76d207a | 23 | struct uid_gid_map projid_map; |
c61a2810 | 24 | atomic_t count; |
aeb3ae9d | 25 | struct user_namespace *parent; |
8742f229 | 26 | int level; |
783291e6 EB |
27 | kuid_t owner; |
28 | kgid_t group; | |
98f842e6 | 29 | unsigned int proc_inum; |
acce292c CLG |
30 | }; |
31 | ||
32 | extern struct user_namespace init_user_ns; | |
33 | ||
34 | #ifdef CONFIG_USER_NS | |
35 | ||
36 | static inline struct user_namespace *get_user_ns(struct user_namespace *ns) | |
37 | { | |
38 | if (ns) | |
c61a2810 | 39 | atomic_inc(&ns->count); |
acce292c CLG |
40 | return ns; |
41 | } | |
42 | ||
18b6e041 | 43 | extern int create_user_ns(struct cred *new); |
b2e0d987 | 44 | extern int unshare_userns(unsigned long unshare_flags, struct cred **new_cred); |
c61a2810 | 45 | extern void free_user_ns(struct user_namespace *ns); |
acce292c CLG |
46 | |
47 | static inline void put_user_ns(struct user_namespace *ns) | |
48 | { | |
c61a2810 EB |
49 | if (ns && atomic_dec_and_test(&ns->count)) |
50 | free_user_ns(ns); | |
acce292c CLG |
51 | } |
52 | ||
22d917d8 EB |
53 | struct seq_operations; |
54 | extern struct seq_operations proc_uid_seq_operations; | |
55 | extern struct seq_operations proc_gid_seq_operations; | |
f76d207a | 56 | extern struct seq_operations proc_projid_seq_operations; |
22d917d8 EB |
57 | extern ssize_t proc_uid_map_write(struct file *, const char __user *, size_t, loff_t *); |
58 | extern ssize_t proc_gid_map_write(struct file *, const char __user *, size_t, loff_t *); | |
f76d207a | 59 | extern ssize_t proc_projid_map_write(struct file *, const char __user *, size_t, loff_t *); |
acce292c CLG |
60 | #else |
61 | ||
62 | static inline struct user_namespace *get_user_ns(struct user_namespace *ns) | |
63 | { | |
64 | return &init_user_ns; | |
65 | } | |
66 | ||
18b6e041 | 67 | static inline int create_user_ns(struct cred *new) |
acce292c | 68 | { |
18b6e041 | 69 | return -EINVAL; |
acce292c CLG |
70 | } |
71 | ||
b2e0d987 EB |
72 | static inline int unshare_userns(unsigned long unshare_flags, |
73 | struct cred **new_cred) | |
74 | { | |
75 | if (unshare_flags & CLONE_NEWUSER) | |
76 | return -EINVAL; | |
77 | return 0; | |
78 | } | |
79 | ||
acce292c CLG |
80 | static inline void put_user_ns(struct user_namespace *ns) |
81 | { | |
82 | } | |
83 | ||
22d917d8 EB |
84 | #endif |
85 | ||
acce292c | 86 | #endif /* _LINUX_USER_H */ |