| 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899 |
- /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
- #ifndef __BPF_ENDIAN__
- #define __BPF_ENDIAN__
- /*
- * Isolate byte #n and put it into byte #m, for __u##b type.
- * E.g., moving byte #6 (nnnnnnnn) into byte #1 (mmmmmmmm) for __u64:
- * 1) xxxxxxxx nnnnnnnn xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx mmmmmmmm xxxxxxxx
- * 2) nnnnnnnn xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx mmmmmmmm xxxxxxxx 00000000
- * 3) 00000000 00000000 00000000 00000000 00000000 00000000 00000000 nnnnnnnn
- * 4) 00000000 00000000 00000000 00000000 00000000 00000000 nnnnnnnn 00000000
- */
- #define ___bpf_mvb(x, b, n, m) ((__u##b)(x) << (b-(n+1)*8) >> (b-8) << (m*8))
- #define ___bpf_swab16(x) ((__u16)( \
- ___bpf_mvb(x, 16, 0, 1) | \
- ___bpf_mvb(x, 16, 1, 0)))
- #define ___bpf_swab32(x) ((__u32)( \
- ___bpf_mvb(x, 32, 0, 3) | \
- ___bpf_mvb(x, 32, 1, 2) | \
- ___bpf_mvb(x, 32, 2, 1) | \
- ___bpf_mvb(x, 32, 3, 0)))
- #define ___bpf_swab64(x) ((__u64)( \
- ___bpf_mvb(x, 64, 0, 7) | \
- ___bpf_mvb(x, 64, 1, 6) | \
- ___bpf_mvb(x, 64, 2, 5) | \
- ___bpf_mvb(x, 64, 3, 4) | \
- ___bpf_mvb(x, 64, 4, 3) | \
- ___bpf_mvb(x, 64, 5, 2) | \
- ___bpf_mvb(x, 64, 6, 1) | \
- ___bpf_mvb(x, 64, 7, 0)))
- /* 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) ___bpf_swab16(x)
- # define __bpf_constant_htons(x) ___bpf_swab16(x)
- # define __bpf_ntohl(x) __builtin_bswap32(x)
- # define __bpf_htonl(x) __builtin_bswap32(x)
- # define __bpf_constant_ntohl(x) ___bpf_swab32(x)
- # define __bpf_constant_htonl(x) ___bpf_swab32(x)
- # define __bpf_be64_to_cpu(x) __builtin_bswap64(x)
- # define __bpf_cpu_to_be64(x) __builtin_bswap64(x)
- # define __bpf_constant_be64_to_cpu(x) ___bpf_swab64(x)
- # define __bpf_constant_cpu_to_be64(x) ___bpf_swab64(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)
- # define __bpf_be64_to_cpu(x) (x)
- # define __bpf_cpu_to_be64(x) (x)
- # define __bpf_constant_be64_to_cpu(x) (x)
- # define __bpf_constant_cpu_to_be64(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))
- #define bpf_cpu_to_be64(x) \
- (__builtin_constant_p(x) ? \
- __bpf_constant_cpu_to_be64(x) : __bpf_cpu_to_be64(x))
- #define bpf_be64_to_cpu(x) \
- (__builtin_constant_p(x) ? \
- __bpf_constant_be64_to_cpu(x) : __bpf_be64_to_cpu(x))
- #endif /* __BPF_ENDIAN__ */
|
