Inbound rule support

option/address.go

@@ -0,0 +1,27 @@
+package option
+
+import (
+	"encoding/json"
+	"net/netip"
+)
+
+type ListenAddress netip.Addr
+
+func (a *ListenAddress) MarshalJSON() ([]byte, error) {
+	value := netip.Addr(*a).String()
+	return json.Marshal(value)
+}
+
+func (a *ListenAddress) UnmarshalJSON(bytes []byte) error {
+	var value string
+	err := json.Unmarshal(bytes, &value)
+	if err != nil {
+		return err
+	}
+	addr, err := netip.ParseAddr(value)
+	if err != nil {
+		return err
+	}
+	*a = ListenAddress(addr)
+	return nil
+}