From 4f74b7804186c75e0e55a7cdb2409769bff7509f Mon Sep 17 00:00:00 2001
From: Eugene Yakubovich <eugene.yakubovich@coreos.com>
Date: Mon, 13 Jul 2015 15:41:02 -0700
Subject: [PATCH] enable net.ipv4.ip_forward in plugins that need it

---
 ip/ipforward.go | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 ip/ipforward.go

diff --git a/ip/ipforward.go b/ip/ipforward.go
new file mode 100644
index 00000000..0a1ca252
--- /dev/null
+++ b/ip/ipforward.go
@@ -0,0 +1,31 @@
+// Copyright 2015 CoreOS, Inc.
+//
+// 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 ip
+
+import (
+	"io/ioutil"
+)
+
+func EnableIP4Forward() error {
+	return echo1("/proc/sys/net/ipv4/ip_forward")
+}
+
+func EnableIP6Forward() error {
+	return echo1("/proc/sys/net/ipv6/conf/all/forwarding")
+}
+
+func echo1(f string) error {
+	return ioutil.WriteFile(f, []byte("1"), 0644)
+}