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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; | |
acce292c | 23 | struct kref kref; |
aeb3ae9d | 24 | struct user_namespace *parent; |
783291e6 EB |
25 | kuid_t owner; |
26 | kgid_t group; | |
acce292c CLG |
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 | ||
18b6e041 | 40 | extern int create_user_ns(struct cred *new); |
acce292c CLG |
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 | ||
22d917d8 EB |
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 *); | |
acce292c CLG |
54 | #else |
55 | ||
56 | static inline struct user_namespace *get_user_ns(struct user_namespace *ns) | |
57 | { | |
58 | return &init_user_ns; | |
59 | } | |
60 | ||
18b6e041 | 61 | static inline int create_user_ns(struct cred *new) |
acce292c | 62 | { |
18b6e041 | 63 | return -EINVAL; |
acce292c CLG |
64 | } |
65 | ||
66 | static inline void put_user_ns(struct user_namespace *ns) | |
67 | { | |
68 | } | |
69 | ||
22d917d8 EB |
70 | #endif |
71 | ||
5c1469de | 72 | static inline uid_t user_ns_map_uid(struct user_namespace *to, |
078de5f7 | 73 | const struct cred *cred, kuid_t uid) |
5c1469de | 74 | { |
078de5f7 | 75 | return from_kuid_munged(to, uid); |
5c1469de | 76 | } |
22d917d8 | 77 | |
5c1469de | 78 | static inline gid_t user_ns_map_gid(struct user_namespace *to, |
078de5f7 | 79 | const struct cred *cred, kgid_t gid) |
5c1469de | 80 | { |
078de5f7 | 81 | return from_kgid_munged(to, gid); |
5c1469de EB |
82 | } |
83 | ||
acce292c | 84 | #endif /* _LINUX_USER_H */ |