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
7 #include <linux/sockptr.h>
9 typedef sockptr_t bpfptr_t;
11 static inline bool bpfptr_is_kernel(bpfptr_t bpfptr)
13 return bpfptr.is_kernel;
16 static inline bpfptr_t KERNEL_BPFPTR(void *p)
18 return (bpfptr_t) { .kernel = p, .is_kernel = true };
21 static inline bpfptr_t USER_BPFPTR(void __user *p)
23 return (bpfptr_t) { .user = p };
26 static inline bpfptr_t make_bpfptr(u64 addr, bool is_kernel)
29 return KERNEL_BPFPTR((void*) (uintptr_t) addr);
31 return USER_BPFPTR(u64_to_user_ptr(addr));
34 static inline bool bpfptr_is_null(bpfptr_t bpfptr)
36 if (bpfptr_is_kernel(bpfptr))
37 return !bpfptr.kernel;
41 static inline void bpfptr_add(bpfptr_t *bpfptr, size_t val)
43 if (bpfptr_is_kernel(*bpfptr))
44 bpfptr->kernel += val;
49 static inline int copy_from_bpfptr_offset(void *dst, bpfptr_t src,
50 size_t offset, size_t size)
52 return copy_from_sockptr_offset(dst, (sockptr_t) src, offset, size);
55 static inline int copy_from_bpfptr(void *dst, bpfptr_t src, size_t size)
57 return copy_from_bpfptr_offset(dst, src, 0, size);
60 static inline int copy_to_bpfptr_offset(bpfptr_t dst, size_t offset,
61 const void *src, size_t size)
63 return copy_to_sockptr_offset((sockptr_t) dst, offset, src, size);
66 static inline void *kvmemdup_bpfptr(bpfptr_t src, size_t len)
68 void *p = kvmalloc(len, GFP_USER | __GFP_NOWARN);
71 return ERR_PTR(-ENOMEM);
72 if (copy_from_bpfptr(p, src, len)) {
74 return ERR_PTR(-EFAULT);
79 static inline long strncpy_from_bpfptr(char *dst, bpfptr_t src, size_t count)
81 return strncpy_from_sockptr(dst, (sockptr_t) src, count);
84 #endif /* _LINUX_BPFPTR_H */