add network for bypass

hop/hop.go

@@ -7,6 +7,7 @@ import (
 )
 
 type SelectOptions struct {
+	Network  string
 	Addr     string
 	Host     string
 	Protocol string
@@ -14,6 +15,12 @@ type SelectOptions struct {
 
 type SelectOption func(*SelectOptions)
 
+func NetworkSelectOption(network string) SelectOption {
+	return func(so *SelectOptions) {
+		so.Network = network
+	}
+}
+
 func AddrSelectOption(addr string) SelectOption {
 	return func(o *SelectOptions) {
 		o.Addr = addr