Merge branch 'main' into feature/port-forwarding

client/firewall/iptables/manager_linux.go

@@ -213,6 +213,19 @@ func (m *Manager) AllowNetbird() error {
 // Flush doesn't need to be implemented for this manager
 func (m *Manager) Flush() error { return nil }
 
+// SetLogLevel sets the log level for the firewall manager
+func (m *Manager) SetLogLevel(log.Level) {
+	// not supported
+}
+
+func (m *Manager) EnableRouting() error {
+	return nil
+}
+
+func (m *Manager) DisableRouting() error {
+	return nil
+}
+
 // AddDNATRule adds a DNAT rule
 func (m *Manager) AddDNATRule(rule firewall.ForwardRule) (firewall.Rule, error) {
 	m.mutex.Lock()

client/firewall/iptables/router_linux.go

@@ -152,7 +152,16 @@ func (r *router) AddRouteFiltering(
 	}
 
 	rule := genRouteFilteringRuleSpec(params)
-	if err := r.iptablesClient.Append(tableFilter, chainRTFWDIN, rule...); err != nil {
+	// Insert DROP rules at the beginning, append ACCEPT rules at the end
+	var err error
+	if action == firewall.ActionDrop {
+		// after the established rule
+		err = r.iptablesClient.Insert(tableFilter, chainRTFWDIN, 2, rule...)
+	} else {
+		err = r.iptablesClient.Append(tableFilter, chainRTFWDIN, rule...)
+	}
+
+	if err != nil {
 		return nil, fmt.Errorf("add route rule: %v", err)
 	}