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cdf7fb0a AS |
1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
2 | /* A pointer that can point to either kernel or userspace memory. */ | |
3 | #ifndef _LINUX_BPFPTR_H | |
4 | #define _LINUX_BPFPTR_H | |
5 | ||
6 | #include <linux/sockptr.h> | |
7 | ||
8 | typedef sockptr_t bpfptr_t; | |
9 | ||
10 | static inline bool bpfptr_is_kernel(bpfptr_t bpfptr) | |
11 | { | |
12 | return bpfptr.is_kernel; | |
13 | } | |
14 | ||
15 | static inline bpfptr_t KERNEL_BPFPTR(void *p) | |
16 | { | |
17 | return (bpfptr_t) { .kernel = p, .is_kernel = true }; | |
18 | } | |
19 | ||
20 | static inline bpfptr_t USER_BPFPTR(void __user *p) | |
21 | { | |
22 | return (bpfptr_t) { .user = p }; | |
23 | } | |
24 | ||
25 | static inline bpfptr_t make_bpfptr(u64 addr, bool is_kernel) | |
26 | { | |
27 | if (is_kernel) | |
28 | return KERNEL_BPFPTR((void*) (uintptr_t) addr); | |
29 | else | |
30 | return USER_BPFPTR(u64_to_user_ptr(addr)); | |
31 | } | |
32 | ||
33 | static inline bool bpfptr_is_null(bpfptr_t bpfptr) | |
34 | { | |
35 | if (bpfptr_is_kernel(bpfptr)) | |
36 | return !bpfptr.kernel; | |
37 | return !bpfptr.user; | |
38 | } | |
39 | ||
40 | static inline void bpfptr_add(bpfptr_t *bpfptr, size_t val) | |
41 | { | |
42 | if (bpfptr_is_kernel(*bpfptr)) | |
43 | bpfptr->kernel += val; | |
44 | else | |
45 | bpfptr->user += val; | |
46 | } | |
47 | ||
48 | static inline int copy_from_bpfptr_offset(void *dst, bpfptr_t src, | |
49 | size_t offset, size_t size) | |
50 | { | |
51 | return copy_from_sockptr_offset(dst, (sockptr_t) src, offset, size); | |
52 | } | |
53 | ||
54 | static inline int copy_from_bpfptr(void *dst, bpfptr_t src, size_t size) | |
55 | { | |
56 | return copy_from_bpfptr_offset(dst, src, 0, size); | |
57 | } | |
58 | ||
59 | static inline int copy_to_bpfptr_offset(bpfptr_t dst, size_t offset, | |
60 | const void *src, size_t size) | |
61 | { | |
62 | return copy_to_sockptr_offset((sockptr_t) dst, offset, src, size); | |
63 | } | |
64 | ||
65 | static inline void *memdup_bpfptr(bpfptr_t src, size_t len) | |
66 | { | |
67 | return memdup_sockptr((sockptr_t) src, len); | |
68 | } | |
69 | ||
70 | static inline long strncpy_from_bpfptr(char *dst, bpfptr_t src, size_t count) | |
71 | { | |
72 | return strncpy_from_sockptr(dst, (sockptr_t) src, count); | |
73 | } | |
74 | ||
75 | #endif /* _LINUX_BPFPTR_H */ |