58 lines
2.0 KiB
C
58 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __BPF_ENDIAN__
|
|
#define __BPF_ENDIAN__
|
|
|
|
#include <linux/swab.h>
|
|
|
|
/* LLVM's BPF target selects the endianness of the CPU
|
|
* it compiles on, or the user specifies (bpfel/bpfeb),
|
|
* respectively. The used __BYTE_ORDER__ is defined by
|
|
* the compiler, we cannot rely on __BYTE_ORDER from
|
|
* libc headers, since it doesn't reflect the actual
|
|
* requested byte order.
|
|
*
|
|
* Note, LLVM's BPF target has different __builtin_bswapX()
|
|
* semantics. It does map to BPF_ALU | BPF_END | BPF_TO_BE
|
|
* in bpfel and bpfeb case, which means below, that we map
|
|
* to cpu_to_be16(). We could use it unconditionally in BPF
|
|
* case, but better not rely on it, so that this header here
|
|
* can be used from application and BPF program side, which
|
|
* use different targets.
|
|
*/
|
|
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
|
|
# define __bpf_ntohs(x) __builtin_bswap16(x)
|
|
# define __bpf_htons(x) __builtin_bswap16(x)
|
|
# define __bpf_constant_ntohs(x) ___constant_swab16(x)
|
|
# define __bpf_constant_htons(x) ___constant_swab16(x)
|
|
# define __bpf_ntohl(x) __builtin_bswap32(x)
|
|
# define __bpf_htonl(x) __builtin_bswap32(x)
|
|
# define __bpf_constant_ntohl(x) ___constant_swab32(x)
|
|
# define __bpf_constant_htonl(x) ___constant_swab32(x)
|
|
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
|
|
# define __bpf_ntohs(x) (x)
|
|
# define __bpf_htons(x) (x)
|
|
# define __bpf_constant_ntohs(x) (x)
|
|
# define __bpf_constant_htons(x) (x)
|
|
# define __bpf_ntohl(x) (x)
|
|
# define __bpf_htonl(x) (x)
|
|
# define __bpf_constant_ntohl(x) (x)
|
|
# define __bpf_constant_htonl(x) (x)
|
|
#else
|
|
# error "Fix your compiler's __BYTE_ORDER__?!"
|
|
#endif
|
|
|
|
#define bpf_htons(x) \
|
|
(__builtin_constant_p(x) ? \
|
|
__bpf_constant_htons(x) : __bpf_htons(x))
|
|
#define bpf_ntohs(x) \
|
|
(__builtin_constant_p(x) ? \
|
|
__bpf_constant_ntohs(x) : __bpf_ntohs(x))
|
|
#define bpf_htonl(x) \
|
|
(__builtin_constant_p(x) ? \
|
|
__bpf_constant_htonl(x) : __bpf_htonl(x))
|
|
#define bpf_ntohl(x) \
|
|
(__builtin_constant_p(x) ? \
|
|
__bpf_constant_ntohl(x) : __bpf_ntohl(x))
|
|
|
|
#endif /* __BPF_ENDIAN__ */
|