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// +build darwin dragonfly freebsd netbsd
package raw
import (
"syscall"
"unsafe"
)
// setBPFDirection enables filtering traffic traveling in a specific direction
// using BPF, so that traffic sent by this package is not captured when reading
// using this package.
func setBPFDirection(fd int, direction int) error {
_, _, err := syscall.Syscall(
syscall.SYS_IOCTL,
uintptr(fd),
// Even though BIOCSDIRECTION is preferred on FreeBSD, BIOCSSEESENT continues
// to work, and is required for other BSD platforms
syscall.BIOCSSEESENT,
uintptr(unsafe.Pointer(&direction)),
)
if err != 0 {
return syscall.Errno(err)
}
return nil
}
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