From 7920ed3ee7b4c95f169bc46c69b623dce50ad6ab Mon Sep 17 00:00:00 2001
From: Michael Crosby <michael@crosbymichael.com>
Date: Sat, 8 Feb 2014 09:53:04 -0800
Subject: [PATCH] Add set master for interface Docker-DCO-1.1-Signed-off-by:
 Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
 Upstream-commit: a6c791e8a92f29a2ae2c6bc81e4ab873d3ceb41f Component: engine

---
 .../engine/pkg/netlink/netlink_linux.go       | 33 +++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/components/engine/pkg/netlink/netlink_linux.go b/components/engine/pkg/netlink/netlink_linux.go
index 0ea5b4dbac..01b3ff08fc 100644
--- a/components/engine/pkg/netlink/netlink_linux.go
+++ b/components/engine/pkg/netlink/netlink_linux.go
@@ -386,6 +386,39 @@ func NetworkSetMTU(iface *net.Interface, mtu int) error {
 	return s.HandleAck(wb.Seq)
 }
 
+// same as ip link set $name master $master
+func NetworkSetMaster(iface, master *net.Interface) error {
+	s, err := getNetlinkSocket()
+	if err != nil {
+		return err
+	}
+	defer s.Close()
+
+	wb := newNetlinkRequest(syscall.RTM_SETLINK, syscall.NLM_F_ACK)
+
+	msg := newIfInfomsg(syscall.AF_UNSPEC)
+	msg.Type = syscall.RTM_SETLINK
+	msg.Flags = syscall.NLM_F_REQUEST
+	msg.Index = int32(iface.Index)
+	msg.Change = 0xFFFFFFFF
+	wb.AddData(msg)
+
+	var (
+		b      = make([]byte, 4)
+		native = nativeEndian()
+	)
+	native.PutUint32(b, uint32(master.Index))
+
+	data := newRtAttr(syscall.IFLA_MASTER, b)
+	wb.AddData(data)
+
+	if err := s.Send(wb); err != nil {
+		return err
+	}
+
+	return s.HandleAck(wb.Seq)
+}
+
 // Add an Ip address to an interface. This is identical to:
 // ip addr add $ip/$ipNet dev $iface
 func NetworkLinkAddIp(iface *net.Interface, ip net.IP, ipNet *net.IPNet) error {