github.com/borderzero/water@v0.0.1/waterutil/tun.go (about)

     1  package waterutil
     2  
     3  func IsIPv4(packet []byte) bool {
     4  	return 4 == (packet[0] >> 4)
     5  }
     6  
     7  func IsIPv6(packet []byte) bool {
     8  	return 6 == (packet[0] >> 4)
     9  }