Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
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
8typedef sockptr_t bpfptr_t;
9
10static inline bool bpfptr_is_kernel(bpfptr_t bpfptr)
11{
12 return bpfptr.is_kernel;
13}
14
15static inline bpfptr_t KERNEL_BPFPTR(void *p)
16{
17 return (bpfptr_t) { .kernel = p, .is_kernel = true };
18}
19
20static inline bpfptr_t USER_BPFPTR(void __user *p)
21{
22 return (bpfptr_t) { .user = p };
23}
24
25static 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
33static 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
40static 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
48static 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
54static 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
59static 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
65static inline void *kvmemdup_bpfptr(bpfptr_t src, size_t len)
66{
67 void *p = kvmalloc(len, GFP_USER | __GFP_NOWARN);
68
69 if (!p)
70 return ERR_PTR(-ENOMEM);
71 if (copy_from_bpfptr(p, src, len)) {
72 kvfree(p);
73 return ERR_PTR(-EFAULT);
74 }
75 return p;
76}
77
78static inline long strncpy_from_bpfptr(char *dst, bpfptr_t src, size_t count)
79{
80 return strncpy_from_sockptr(dst, (sockptr_t) src, count);
81}
82
83#endif /* _LINUX_BPFPTR_H */