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
bpfptr_is_kernel(bpfptr_t bpfptr)10 static inline bool bpfptr_is_kernel(bpfptr_t bpfptr)
11 {
12 return bpfptr.is_kernel;
13 }
14
KERNEL_BPFPTR(void * p)15 static inline bpfptr_t KERNEL_BPFPTR(void *p)
16 {
17 return (bpfptr_t) { .kernel = p, .is_kernel = true };
18 }
19
USER_BPFPTR(void __user * p)20 static inline bpfptr_t USER_BPFPTR(void __user *p)
21 {
22 return (bpfptr_t) { .user = p };
23 }
24
make_bpfptr(u64 addr,bool is_kernel)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
bpfptr_is_null(bpfptr_t bpfptr)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
bpfptr_add(bpfptr_t * bpfptr,size_t val)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
copy_from_bpfptr_offset(void * dst,bpfptr_t src,size_t offset,size_t size)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
copy_from_bpfptr(void * dst,bpfptr_t src,size_t size)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
copy_to_bpfptr_offset(bpfptr_t dst,size_t offset,const void * src,size_t size)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
kvmemdup_bpfptr(bpfptr_t src,size_t len)65 static 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
strncpy_from_bpfptr(char * dst,bpfptr_t src,size_t count)78 static 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 */
84
