fixup! dnsmasq: add veth generation and configuration

platform/local/dnsmasq.go

@@ -313,6 +313,28 @@ func newSegment(s byte) (*Segment, error) {
 		return nil, fmt.Errorf("unable to set up link: %w", err)
 	}
 
+	// `ip route get 1.0.0.0` in order to get device to configure NAT on
+	d := net.IPv4(1, 0, 0, 0)
+
+	routes, err := netlink.RouteGet(d)
+	if err != nil {
+		return nil, fmt.Errorf("unable to get routes: %w", err)
+	}
+
+	if len(routes) < 0 {
+		return nil, fmt.Errorf("at least one default route is required")
+	}
+
+	route := routes[0]
+	l, err := netlink.LinkByIndex(route.LinkIndex)
+	if err != nil {
+		return nil, fmt.Errorf("unable to get link by index: %w", err)
+	}
+
+	if err := configureNAT(l.Attrs().Name); err != nil {
+		return nil, fmt.Errorf("unable to configure NAT: %w", err)
+	}
+
 	if err := rootExit(); err != nil {
 		return nil, fmt.Errorf("unable to exit root namespace: %w", err)
 	}