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__ */ 73