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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
bc1bafbb DM |
2 | #ifndef __BPF_ENDIAN__ |
3 | #define __BPF_ENDIAN__ | |
4 | ||
78a5a93c | 5 | #include <linux/swab.h> |
bc1bafbb | 6 | |
78a5a93c DB |
7 | /* LLVM's BPF target selects the endianness of the CPU |
8 | * it compiles on, or the user specifies (bpfel/bpfeb), | |
9 | * respectively. The used __BYTE_ORDER__ is defined by | |
10 | * the compiler, we cannot rely on __BYTE_ORDER from | |
11 | * libc headers, since it doesn't reflect the actual | |
12 | * requested byte order. | |
13 | * | |
14 | * Note, LLVM's BPF target has different __builtin_bswapX() | |
15 | * semantics. It does map to BPF_ALU | BPF_END | BPF_TO_BE | |
16 | * in bpfel and bpfeb case, which means below, that we map | |
17 | * to cpu_to_be16(). We could use it unconditionally in BPF | |
18 | * case, but better not rely on it, so that this header here | |
19 | * can be used from application and BPF program side, which | |
20 | * use different targets. | |
21 | */ | |
22 | #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ | |
23 | # define __bpf_ntohs(x) __builtin_bswap16(x) | |
24 | # define __bpf_htons(x) __builtin_bswap16(x) | |
25 | # define __bpf_constant_ntohs(x) ___constant_swab16(x) | |
26 | # define __bpf_constant_htons(x) ___constant_swab16(x) | |
53335022 YS |
27 | # define __bpf_ntohl(x) __builtin_bswap32(x) |
28 | # define __bpf_htonl(x) __builtin_bswap32(x) | |
29 | # define __bpf_constant_ntohl(x) ___constant_swab32(x) | |
30 | # define __bpf_constant_htonl(x) ___constant_swab32(x) | |
78a5a93c DB |
31 | #elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ |
32 | # define __bpf_ntohs(x) (x) | |
33 | # define __bpf_htons(x) (x) | |
34 | # define __bpf_constant_ntohs(x) (x) | |
35 | # define __bpf_constant_htons(x) (x) | |
53335022 YS |
36 | # define __bpf_ntohl(x) (x) |
37 | # define __bpf_htonl(x) (x) | |
38 | # define __bpf_constant_ntohl(x) (x) | |
39 | # define __bpf_constant_htonl(x) (x) | |
bc1bafbb | 40 | #else |
78a5a93c | 41 | # error "Fix your compiler's __BYTE_ORDER__?!" |
bc1bafbb DM |
42 | #endif |
43 | ||
44 | #define bpf_htons(x) \ | |
45 | (__builtin_constant_p(x) ? \ | |
78a5a93c | 46 | __bpf_constant_htons(x) : __bpf_htons(x)) |
bc1bafbb DM |
47 | #define bpf_ntohs(x) \ |
48 | (__builtin_constant_p(x) ? \ | |
78a5a93c | 49 | __bpf_constant_ntohs(x) : __bpf_ntohs(x)) |
53335022 YS |
50 | #define bpf_htonl(x) \ |
51 | (__builtin_constant_p(x) ? \ | |
52 | __bpf_constant_htonl(x) : __bpf_htonl(x)) | |
53 | #define bpf_ntohl(x) \ | |
54 | (__builtin_constant_p(x) ? \ | |
55 | __bpf_constant_ntohl(x) : __bpf_ntohl(x)) | |
bc1bafbb | 56 | |
78a5a93c | 57 | #endif /* __BPF_ENDIAN__ */ |