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929ffa6e9d
bpf_helpers.h and bpf_endian.h contain useful macros and BPF helper definitions essential to almost every BPF program. Which makes them useful not just for selftests. To be able to expose them as part of libbpf, though, we need them to be dual-licensed as LGPL-2.1 OR BSD-2-Clause. This patch updates licensing of those two files. Acked-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Hechao Li <hechaol@fb.com> Acked-by: Martin KaFai Lau <kafai@fb.com> Acked-by: Andrey Ignatov <rdna@fb.com> Acked-by: Yonghong Song <yhs@fb.com> Acked-by: Lawrence Brakmo <brakmo@fb.com> Acked-by: Adam Barth <arb@fb.com> Acked-by: Roman Gushchin <guro@fb.com> Acked-by: Josef Bacik <jbacik@fb.com> Acked-by: Joe Stringer <joe@wand.net.nz> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Joel Fernandes (Google) <joel@joelfernandes.org> Acked-by: David Ahern <dsahern@gmail.com> Acked-by: Jesper Dangaard Brouer <brouer@redhat.com> Acked-by: Ilya Leoshkevich <iii@linux.ibm.com> Acked-by: Lorenz Bauer <lmb@cloudflare.com> Acked-by: Adrian Ratiu <adrian.ratiu@collabora.com> Acked-by: Nikita V. Shirokov <tehnerd@tehnerd.com> Acked-by: Willem de Bruijn <willemb@google.com> Acked-by: Petar Penkov <ppenkov@google.com> Acked-by: Teng Qin <palmtenor@gmail.com> Cc: Michael Holzheu <holzheu@linux.vnet.ibm.com> Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Cc: David S. Miller <davem@davemloft.net> Cc: Michal Rostecki <mrostecki@opensuse.org> Cc: John Fastabend <john.fastabend@gmail.com> Cc: Sargun Dhillon <sargun@sargun.me> Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
59 lines
2.1 KiB
C
59 lines
2.1 KiB
C
/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
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#ifndef __BPF_ENDIAN__
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#define __BPF_ENDIAN__
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#include <linux/stddef.h>
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#include <linux/swab.h>
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/* LLVM's BPF target selects the endianness of the CPU
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* it compiles on, or the user specifies (bpfel/bpfeb),
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* respectively. The used __BYTE_ORDER__ is defined by
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* the compiler, we cannot rely on __BYTE_ORDER from
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* libc headers, since it doesn't reflect the actual
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* requested byte order.
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*
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* Note, LLVM's BPF target has different __builtin_bswapX()
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* semantics. It does map to BPF_ALU | BPF_END | BPF_TO_BE
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* in bpfel and bpfeb case, which means below, that we map
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* to cpu_to_be16(). We could use it unconditionally in BPF
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* case, but better not rely on it, so that this header here
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* can be used from application and BPF program side, which
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* use different targets.
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*/
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#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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# define __bpf_ntohs(x) __builtin_bswap16(x)
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# define __bpf_htons(x) __builtin_bswap16(x)
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# define __bpf_constant_ntohs(x) ___constant_swab16(x)
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# define __bpf_constant_htons(x) ___constant_swab16(x)
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# define __bpf_ntohl(x) __builtin_bswap32(x)
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# define __bpf_htonl(x) __builtin_bswap32(x)
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# define __bpf_constant_ntohl(x) ___constant_swab32(x)
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# define __bpf_constant_htonl(x) ___constant_swab32(x)
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#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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# define __bpf_ntohs(x) (x)
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# define __bpf_htons(x) (x)
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# define __bpf_constant_ntohs(x) (x)
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# define __bpf_constant_htons(x) (x)
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# define __bpf_ntohl(x) (x)
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# define __bpf_htonl(x) (x)
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# define __bpf_constant_ntohl(x) (x)
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# define __bpf_constant_htonl(x) (x)
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#else
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# error "Fix your compiler's __BYTE_ORDER__?!"
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#endif
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#define bpf_htons(x) \
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(__builtin_constant_p(x) ? \
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__bpf_constant_htons(x) : __bpf_htons(x))
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#define bpf_ntohs(x) \
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(__builtin_constant_p(x) ? \
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__bpf_constant_ntohs(x) : __bpf_ntohs(x))
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#define bpf_htonl(x) \
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(__builtin_constant_p(x) ? \
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__bpf_constant_htonl(x) : __bpf_htonl(x))
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#define bpf_ntohl(x) \
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(__builtin_constant_p(x) ? \
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__bpf_constant_ntohl(x) : __bpf_ntohl(x))
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#endif /* __BPF_ENDIAN__ */
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