getting there...

go/pkg/zerotier/misc.go

@@ -15,10 +15,22 @@ package zerotier
 
 import (
 	"encoding/base32"
+	"net"
 	"time"
+	"unsafe"
 )
 
 var base32StdLowerCase = base32.NewEncoding("abcdefghijklmnopqrstuvwxyz234567")
 
 // TimeMs returns the time in milliseconds since epoch.
 func TimeMs() int64 { return int64(time.Now().UnixNano()) / int64(1000000) }
+
+// ipNetToKey creates a key that can be used in a map[] from a net.IPNet
+func ipNetToKey(ipn *net.IPNet) (k [3]uint64) {
+	if len(ipn.IP) > 0 {
+		copy(((*[16]byte)(unsafe.Pointer(&k[0])))[:], ipn.IP)
+	}
+	ones, bits := ipn.Mask.Size()
+	k[2] = (uint64(ones) << 32) | uint64(bits)
+	return
+}