89 lines
2.0 KiB
C
89 lines
2.0 KiB
C
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/* SPDX-License-Identifier: GPL-2.0-only */
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/* A pointer that can point to either kernel or userspace memory. */
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#ifndef _LINUX_BPFPTR_H
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#define _LINUX_BPFPTR_H
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#include <linux/mm.h>
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#include <linux/sockptr.h>
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typedef sockptr_t bpfptr_t;
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static inline bool bpfptr_is_kernel(bpfptr_t bpfptr)
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{
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return bpfptr.is_kernel;
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}
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static inline bpfptr_t KERNEL_BPFPTR(void *p)
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{
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return (bpfptr_t) { .kernel = p, .is_kernel = true };
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}
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static inline bpfptr_t USER_BPFPTR(void __user *p)
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{
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return (bpfptr_t) { .user = p };
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}
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static inline bpfptr_t make_bpfptr(u64 addr, bool is_kernel)
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{
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if (is_kernel)
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return KERNEL_BPFPTR((void*) (uintptr_t) addr);
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else
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return USER_BPFPTR(u64_to_user_ptr(addr));
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}
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static inline bool bpfptr_is_null(bpfptr_t bpfptr)
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{
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if (bpfptr_is_kernel(bpfptr))
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return !bpfptr.kernel;
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return !bpfptr.user;
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}
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static inline void bpfptr_add(bpfptr_t *bpfptr, size_t val)
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{
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if (bpfptr_is_kernel(*bpfptr))
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bpfptr->kernel += val;
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else
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bpfptr->user += val;
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}
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static inline int copy_from_bpfptr_offset(void *dst, bpfptr_t src,
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size_t offset, size_t size)
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{
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if (!bpfptr_is_kernel(src))
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return copy_from_user(dst, src.user + offset, size);
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return copy_from_kernel_nofault(dst, src.kernel + offset, size);
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}
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static inline int copy_from_bpfptr(void *dst, bpfptr_t src, size_t size)
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{
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return copy_from_bpfptr_offset(dst, src, 0, size);
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}
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static inline int copy_to_bpfptr_offset(bpfptr_t dst, size_t offset,
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const void *src, size_t size)
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{
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return copy_to_sockptr_offset((sockptr_t) dst, offset, src, size);
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}
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static inline void *kvmemdup_bpfptr(bpfptr_t src, size_t len)
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{
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void *p = kvmalloc(len, GFP_USER | __GFP_NOWARN);
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if (!p)
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return ERR_PTR(-ENOMEM);
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if (copy_from_bpfptr(p, src, len)) {
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kvfree(p);
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return ERR_PTR(-EFAULT);
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}
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return p;
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}
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static inline long strncpy_from_bpfptr(char *dst, bpfptr_t src, size_t count)
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{
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if (bpfptr_is_kernel(src))
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return strncpy_from_kernel_nofault(dst, src.kernel, count);
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return strncpy_from_user(dst, src.user, count);
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}
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#endif /* _LINUX_BPFPTR_H */
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