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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; | |
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; |
f36f8c75 DH |
30 | |
31 | /* Register of per-UID persistent keyrings for this namespace */ | |
32 | #ifdef CONFIG_PERSISTENT_KEYRINGS | |
33 | struct key *persistent_keyring_register; | |
34 | struct rw_semaphore persistent_keyring_register_sem; | |
35 | #endif | |
acce292c CLG |
36 | }; |
37 | ||
38 | extern struct user_namespace init_user_ns; | |
39 | ||
40 | #ifdef CONFIG_USER_NS | |
41 | ||
42 | static inline struct user_namespace *get_user_ns(struct user_namespace *ns) | |
43 | { | |
44 | if (ns) | |
c61a2810 | 45 | atomic_inc(&ns->count); |
acce292c CLG |
46 | return ns; |
47 | } | |
48 | ||
18b6e041 | 49 | extern int create_user_ns(struct cred *new); |
b2e0d987 | 50 | extern int unshare_userns(unsigned long unshare_flags, struct cred **new_cred); |
c61a2810 | 51 | extern void free_user_ns(struct user_namespace *ns); |
acce292c CLG |
52 | |
53 | static inline void put_user_ns(struct user_namespace *ns) | |
54 | { | |
c61a2810 EB |
55 | if (ns && atomic_dec_and_test(&ns->count)) |
56 | free_user_ns(ns); | |
acce292c CLG |
57 | } |
58 | ||
22d917d8 EB |
59 | struct seq_operations; |
60 | extern struct seq_operations proc_uid_seq_operations; | |
61 | extern struct seq_operations proc_gid_seq_operations; | |
f76d207a | 62 | extern struct seq_operations proc_projid_seq_operations; |
22d917d8 EB |
63 | extern ssize_t proc_uid_map_write(struct file *, const char __user *, size_t, loff_t *); |
64 | extern ssize_t proc_gid_map_write(struct file *, const char __user *, size_t, loff_t *); | |
f76d207a | 65 | extern ssize_t proc_projid_map_write(struct file *, const char __user *, size_t, loff_t *); |
acce292c CLG |
66 | #else |
67 | ||
68 | static inline struct user_namespace *get_user_ns(struct user_namespace *ns) | |
69 | { | |
70 | return &init_user_ns; | |
71 | } | |
72 | ||
18b6e041 | 73 | static inline int create_user_ns(struct cred *new) |
acce292c | 74 | { |
18b6e041 | 75 | return -EINVAL; |
acce292c CLG |
76 | } |
77 | ||
b2e0d987 EB |
78 | static inline int unshare_userns(unsigned long unshare_flags, |
79 | struct cred **new_cred) | |
80 | { | |
81 | if (unshare_flags & CLONE_NEWUSER) | |
82 | return -EINVAL; | |
83 | return 0; | |
84 | } | |
85 | ||
acce292c CLG |
86 | static inline void put_user_ns(struct user_namespace *ns) |
87 | { | |
88 | } | |
89 | ||
22d917d8 EB |
90 | #endif |
91 | ||
acce292c | 92 | #endif /* _LINUX_USER_H */ |