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1 | #ifndef _LINUX_PROJID_H |
2 | #define _LINUX_PROJID_H | |
3 | ||
4 | /* | |
5 | * A set of types for the internal kernel types representing project ids. | |
6 | * | |
7 | * The types defined in this header allow distinguishing which project ids in | |
8 | * the kernel are values used by userspace and which project id values are | |
9 | * the internal kernel values. With the addition of user namespaces the values | |
10 | * can be different. Using the type system makes it possible for the compiler | |
11 | * to detect when we overlook these differences. | |
12 | * | |
13 | */ | |
14 | #include <linux/types.h> | |
15 | ||
16 | struct user_namespace; | |
17 | extern struct user_namespace init_user_ns; | |
18 | ||
19 | typedef __kernel_uid32_t projid_t; | |
20 | ||
21 | #ifdef CONFIG_UIDGID_STRICT_TYPE_CHECKS | |
22 | ||
23 | typedef struct { | |
24 | projid_t val; | |
25 | } kprojid_t; | |
26 | ||
27 | static inline projid_t __kprojid_val(kprojid_t projid) | |
28 | { | |
29 | return projid.val; | |
30 | } | |
31 | ||
32 | #define KPROJIDT_INIT(value) (kprojid_t){ value } | |
33 | ||
34 | #else | |
35 | ||
36 | typedef projid_t kprojid_t; | |
37 | ||
38 | static inline projid_t __kprojid_val(kprojid_t projid) | |
39 | { | |
40 | return projid; | |
41 | } | |
42 | ||
43 | #define KPROJIDT_INIT(value) ((kprojid_t) value ) | |
44 | ||
45 | #endif | |
46 | ||
47 | #define INVALID_PROJID KPROJIDT_INIT(-1) | |
48 | #define OVERFLOW_PROJID 65534 | |
49 | ||
50 | static inline bool projid_eq(kprojid_t left, kprojid_t right) | |
51 | { | |
52 | return __kprojid_val(left) == __kprojid_val(right); | |
53 | } | |
54 | ||
55 | static inline bool projid_lt(kprojid_t left, kprojid_t right) | |
56 | { | |
57 | return __kprojid_val(left) < __kprojid_val(right); | |
58 | } | |
59 | ||
60 | static inline bool projid_valid(kprojid_t projid) | |
61 | { | |
62 | return !projid_eq(projid, INVALID_PROJID); | |
63 | } | |
64 | ||
65 | #ifdef CONFIG_USER_NS | |
66 | ||
67 | extern kprojid_t make_kprojid(struct user_namespace *from, projid_t projid); | |
68 | ||
69 | extern projid_t from_kprojid(struct user_namespace *to, kprojid_t projid); | |
70 | extern projid_t from_kprojid_munged(struct user_namespace *to, kprojid_t projid); | |
71 | ||
72 | static inline bool kprojid_has_mapping(struct user_namespace *ns, kprojid_t projid) | |
73 | { | |
74 | return from_kprojid(ns, projid) != (projid_t)-1; | |
75 | } | |
76 | ||
77 | #else | |
78 | ||
79 | static inline kprojid_t make_kprojid(struct user_namespace *from, projid_t projid) | |
80 | { | |
81 | return KPROJIDT_INIT(projid); | |
82 | } | |
83 | ||
84 | static inline projid_t from_kprojid(struct user_namespace *to, kprojid_t kprojid) | |
85 | { | |
86 | return __kprojid_val(kprojid); | |
87 | } | |
88 | ||
89 | static inline projid_t from_kprojid_munged(struct user_namespace *to, kprojid_t kprojid) | |
90 | { | |
91 | projid_t projid = from_kprojid(to, kprojid); | |
92 | if (projid == (projid_t)-1) | |
93 | projid = OVERFLOW_PROJID; | |
94 | return projid; | |
95 | } | |
96 | ||
97 | static inline bool kprojid_has_mapping(struct user_namespace *ns, kprojid_t projid) | |
98 | { | |
99 | return true; | |
100 | } | |
101 | ||
102 | #endif /* CONFIG_USER_NS */ | |
103 | ||
104 | #endif /* _LINUX_PROJID_H */ |