| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ |
| 2 | #ifndef __BPF_ENDIAN__ |
| 3 | #define __BPF_ENDIAN__ |
| 4 | |
| 5 | #include <linux/stddef.h> |
| 6 | #include <linux/swab.h> |
| 7 | |
| 8 | /* LLVM's BPF target selects the endianness of the CPU |
| 9 | * it compiles on, or the user specifies (bpfel/bpfeb), |
| 10 | * respectively. The used __BYTE_ORDER__ is defined by |
| 11 | * the compiler, we cannot rely on __BYTE_ORDER from |
| 12 | * libc headers, since it doesn't reflect the actual |
| 13 | * requested byte order. |
| 14 | * |
| 15 | * Note, LLVM's BPF target has different __builtin_bswapX() |
| 16 | * semantics. It does map to BPF_ALU | BPF_END | BPF_TO_BE |
| 17 | * in bpfel and bpfeb case, which means below, that we map |
| 18 | * to cpu_to_be16(). We could use it unconditionally in BPF |
| 19 | * case, but better not rely on it, so that this header here |
| 20 | * can be used from application and BPF program side, which |
| 21 | * use different targets. |
| 22 | */ |
| 23 | #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ |
| 24 | # define __bpf_ntohs(x) __builtin_bswap16(x) |
| 25 | # define __bpf_htons(x) __builtin_bswap16(x) |
| 26 | # define __bpf_constant_ntohs(x) ___constant_swab16(x) |
| 27 | # define __bpf_constant_htons(x) ___constant_swab16(x) |
| 28 | # define __bpf_ntohl(x) __builtin_bswap32(x) |
| 29 | # define __bpf_htonl(x) __builtin_bswap32(x) |
| 30 | # define __bpf_constant_ntohl(x) ___constant_swab32(x) |
| 31 | # define __bpf_constant_htonl(x) ___constant_swab32(x) |
| 32 | # define __bpf_be64_to_cpu(x) __builtin_bswap64(x) |
| 33 | # define __bpf_cpu_to_be64(x) __builtin_bswap64(x) |
| 34 | # define __bpf_constant_be64_to_cpu(x) ___constant_swab64(x) |
| 35 | # define __bpf_constant_cpu_to_be64(x) ___constant_swab64(x) |
| 36 | #elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ |
| 37 | # define __bpf_ntohs(x) (x) |
| 38 | # define __bpf_htons(x) (x) |
| 39 | # define __bpf_constant_ntohs(x) (x) |
| 40 | # define __bpf_constant_htons(x) (x) |
| 41 | # define __bpf_ntohl(x) (x) |
| 42 | # define __bpf_htonl(x) (x) |
| 43 | # define __bpf_constant_ntohl(x) (x) |
| 44 | # define __bpf_constant_htonl(x) (x) |
| 45 | # define __bpf_be64_to_cpu(x) (x) |
| 46 | # define __bpf_cpu_to_be64(x) (x) |
| 47 | # define __bpf_constant_be64_to_cpu(x) (x) |
| 48 | # define __bpf_constant_cpu_to_be64(x) (x) |
| 49 | #else |
| 50 | # error "Fix your compiler's __BYTE_ORDER__?!" |
| 51 | #endif |
| 52 | |
| 53 | #define bpf_htons(x) \ |
| 54 | (__builtin_constant_p(x) ? \ |
| 55 | __bpf_constant_htons(x) : __bpf_htons(x)) |
| 56 | #define bpf_ntohs(x) \ |
| 57 | (__builtin_constant_p(x) ? \ |
| 58 | __bpf_constant_ntohs(x) : __bpf_ntohs(x)) |
| 59 | #define bpf_htonl(x) \ |
| 60 | (__builtin_constant_p(x) ? \ |
| 61 | __bpf_constant_htonl(x) : __bpf_htonl(x)) |
| 62 | #define bpf_ntohl(x) \ |
| 63 | (__builtin_constant_p(x) ? \ |
| 64 | __bpf_constant_ntohl(x) : __bpf_ntohl(x)) |
| 65 | #define bpf_cpu_to_be64(x) \ |
| 66 | (__builtin_constant_p(x) ? \ |
| 67 | __bpf_constant_cpu_to_be64(x) : __bpf_cpu_to_be64(x)) |
| 68 | #define bpf_be64_to_cpu(x) \ |
| 69 | (__builtin_constant_p(x) ? \ |
| 70 | __bpf_constant_be64_to_cpu(x) : __bpf_be64_to_cpu(x)) |
| 71 | |
| 72 | #endif /* __BPF_ENDIAN__ */ |