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-rw-r--r--pkg/firewall/firewall_linux.go47
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diff --git a/pkg/firewall/firewall_linux.go b/pkg/firewall/firewall_linux.go
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+++ b/pkg/firewall/firewall_linux.go
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+// +build linux
+
+// Copyright 2016 CNI authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package firewall
+
+import (
+ "fmt"
+)
+
+// GetBackend retrieves a firewall backend for adding or removing firewall rules
+// on the system.
+// Valid backend names are firewalld, iptables, and none.
+// If the empty string is given, a firewalld backend will be returned if
+// firewalld is running, and an iptables backend will be returned otherwise.
+func GetBackend(backend string) (FirewallBackend, error) {
+ switch backend {
+ case "firewalld":
+ return newFirewalldBackend()
+ case "iptables":
+ return newIptablesBackend()
+ case "none":
+ return newNoneBackend()
+ case "":
+ // Default to firewalld if it's running
+ if isFirewalldRunning() {
+ return newFirewalldBackend()
+ }
+
+ // Otherwise iptables
+ return newIptablesBackend()
+ default:
+ return nil, fmt.Errorf("unrecognized firewall backend %q", backend)
+ }
+}