bpf: Move endianness BPF helpers out of bpf_util.h

We do not want to include things like stdio.h and friends into
eBPF program builds.  bpf_util.h is for host compiled programs,
so eBPF C-code helpers don't really belong there.

Add a new bpf_endian.h as a quick fix for this for now.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 23 insertions, 0 deletions

diff --git a/tools/testing/selftests/bpf/bpf_endian.h b/tools/testing/selftests/bpf/bpf_endian.h
new file mode 100644
index 000000000000..19d0604f8694
--- /dev/null
+++ b/tools/testing/selftests/bpf/bpf_endian.h
@@ -0,0 +1,23 @@
+#ifndef __BPF_ENDIAN__
+#define __BPF_ENDIAN__
+
+#include <asm/byteorder.h>
+
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+# define __bpf_ntohs(x)         __builtin_bswap16(x)
+# define __bpf_htons(x)         __builtin_bswap16(x)
+#elif __BYTE_ORDER == __BIG_ENDIAN
+# define __bpf_ntohs(x)         (x)
+# define __bpf_htons(x)         (x)
+#else
+# error "Fix your __BYTE_ORDER?!"
+#endif
+
+#define bpf_htons(x)                            \
+        (__builtin_constant_p(x) ?              \
+         __constant_htons(x) : __bpf_htons(x))
+#define bpf_ntohs(x)                            \
+        (__builtin_constant_p(x) ?              \
+         __constant_ntohs(x) : __bpf_ntohs(x))
+
+#endif