Function getIFIndex

polyamide/tun/tun_linux.go:203–229

(name string)

}

func getIFIndex(name string) (int32, error) {
	fd, err := unix.Socket(
		unix.AF_INET,
		unix.SOCK_DGRAM|unix.SOCK_CLOEXEC,
		0,
	)
	if err != nil {
		return 0, err
	}

	defer unix.Close(fd)

	var ifr [ifReqSize]byte
	copy(ifr[:], name)
	_, _, errno := unix.Syscall(
		unix.SYS_IOCTL,
		uintptr(fd),
		uintptr(unix.SIOCGIFINDEX),
		uintptr(unsafe.Pointer(&ifr[0])),
	)

	if errno != 0 {
		return 0, errno
	}

	return *(*int32)(unsafe.Pointer(&ifr[unix.IFNAMSIZ])), nil
}

func (tun *NativeTun) setMTU(n int) error {
	name, err := tun.Name()