| /* 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__ */ |