| /* 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__ */ |
