diff --git a/vendor/go.etcd.io/etcd/pkg/netutil/routes_linux.go b/vendor/go.etcd.io/etcd/pkg/netutil/routes_linux.go
new file mode 100644
index 0000000..5118d3d
--- /dev/null
+++ b/vendor/go.etcd.io/etcd/pkg/netutil/routes_linux.go
@@ -0,0 +1,250 @@
+// Copyright 2016 The etcd 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.
+
+// +build linux
+
+package netutil
+
+import (
+	"bytes"
+	"encoding/binary"
+	"fmt"
+	"net"
+	"sort"
+	"syscall"
+
+	"go.etcd.io/etcd/pkg/cpuutil"
+)
+
+var errNoDefaultRoute = fmt.Errorf("could not find default route")
+var errNoDefaultHost = fmt.Errorf("could not find default host")
+var errNoDefaultInterface = fmt.Errorf("could not find default interface")
+
+// GetDefaultHost obtains the first IP address of machine from the routing table and returns the IP address as string.
+// An IPv4 address is preferred to an IPv6 address for backward compatibility.
+func GetDefaultHost() (string, error) {
+	rmsgs, rerr := getDefaultRoutes()
+	if rerr != nil {
+		return "", rerr
+	}
+
+	// prioritize IPv4
+	if rmsg, ok := rmsgs[syscall.AF_INET]; ok {
+		if host, err := chooseHost(syscall.AF_INET, rmsg); host != "" || err != nil {
+			return host, err
+		}
+		delete(rmsgs, syscall.AF_INET)
+	}
+
+	// sort so choice is deterministic
+	var families []int
+	for family := range rmsgs {
+		families = append(families, int(family))
+	}
+	sort.Ints(families)
+
+	for _, f := range families {
+		family := uint8(f)
+		if host, err := chooseHost(family, rmsgs[family]); host != "" || err != nil {
+			return host, err
+		}
+	}
+
+	return "", errNoDefaultHost
+}
+
+func chooseHost(family uint8, rmsg *syscall.NetlinkMessage) (string, error) {
+	host, oif, err := parsePREFSRC(rmsg)
+	if host != "" || err != nil {
+		return host, err
+	}
+
+	// prefsrc not detected, fall back to getting address from iface
+	ifmsg, ierr := getIfaceAddr(oif, family)
+	if ierr != nil {
+		return "", ierr
+	}
+
+	attrs, aerr := syscall.ParseNetlinkRouteAttr(ifmsg)
+	if aerr != nil {
+		return "", aerr
+	}
+
+	for _, attr := range attrs {
+		// search for RTA_DST because ipv6 doesn't have RTA_SRC
+		if attr.Attr.Type == syscall.RTA_DST {
+			return net.IP(attr.Value).String(), nil
+		}
+	}
+
+	return "", nil
+}
+
+func getDefaultRoutes() (map[uint8]*syscall.NetlinkMessage, error) {
+	dat, err := syscall.NetlinkRIB(syscall.RTM_GETROUTE, syscall.AF_UNSPEC)
+	if err != nil {
+		return nil, err
+	}
+
+	msgs, msgErr := syscall.ParseNetlinkMessage(dat)
+	if msgErr != nil {
+		return nil, msgErr
+	}
+
+	routes := make(map[uint8]*syscall.NetlinkMessage)
+	rtmsg := syscall.RtMsg{}
+	for _, m := range msgs {
+		if m.Header.Type != syscall.RTM_NEWROUTE {
+			continue
+		}
+		buf := bytes.NewBuffer(m.Data[:syscall.SizeofRtMsg])
+		if rerr := binary.Read(buf, cpuutil.ByteOrder(), &rtmsg); rerr != nil {
+			continue
+		}
+		if rtmsg.Dst_len == 0 && rtmsg.Table == syscall.RT_TABLE_MAIN {
+			// zero-length Dst_len implies default route
+			msg := m
+			routes[rtmsg.Family] = &msg
+		}
+	}
+
+	if len(routes) > 0 {
+		return routes, nil
+	}
+
+	return nil, errNoDefaultRoute
+}
+
+// Used to get an address of interface.
+func getIfaceAddr(idx uint32, family uint8) (*syscall.NetlinkMessage, error) {
+	dat, err := syscall.NetlinkRIB(syscall.RTM_GETADDR, int(family))
+	if err != nil {
+		return nil, err
+	}
+
+	msgs, msgErr := syscall.ParseNetlinkMessage(dat)
+	if msgErr != nil {
+		return nil, msgErr
+	}
+
+	ifaddrmsg := syscall.IfAddrmsg{}
+	for _, m := range msgs {
+		if m.Header.Type != syscall.RTM_NEWADDR {
+			continue
+		}
+		buf := bytes.NewBuffer(m.Data[:syscall.SizeofIfAddrmsg])
+		if rerr := binary.Read(buf, cpuutil.ByteOrder(), &ifaddrmsg); rerr != nil {
+			continue
+		}
+		if ifaddrmsg.Index == idx {
+			return &m, nil
+		}
+	}
+
+	return nil, fmt.Errorf("could not find address for interface index %v", idx)
+
+}
+
+// Used to get a name of interface.
+func getIfaceLink(idx uint32) (*syscall.NetlinkMessage, error) {
+	dat, err := syscall.NetlinkRIB(syscall.RTM_GETLINK, syscall.AF_UNSPEC)
+	if err != nil {
+		return nil, err
+	}
+
+	msgs, msgErr := syscall.ParseNetlinkMessage(dat)
+	if msgErr != nil {
+		return nil, msgErr
+	}
+
+	ifinfomsg := syscall.IfInfomsg{}
+	for _, m := range msgs {
+		if m.Header.Type != syscall.RTM_NEWLINK {
+			continue
+		}
+		buf := bytes.NewBuffer(m.Data[:syscall.SizeofIfInfomsg])
+		if rerr := binary.Read(buf, cpuutil.ByteOrder(), &ifinfomsg); rerr != nil {
+			continue
+		}
+		if ifinfomsg.Index == int32(idx) {
+			return &m, nil
+		}
+	}
+
+	return nil, fmt.Errorf("could not find link for interface index %v", idx)
+}
+
+// GetDefaultInterfaces gets names of interfaces and returns a map[interface]families.
+func GetDefaultInterfaces() (map[string]uint8, error) {
+	interfaces := make(map[string]uint8)
+	rmsgs, rerr := getDefaultRoutes()
+	if rerr != nil {
+		return interfaces, rerr
+	}
+
+	for family, rmsg := range rmsgs {
+		_, oif, err := parsePREFSRC(rmsg)
+		if err != nil {
+			return interfaces, err
+		}
+
+		ifmsg, ierr := getIfaceLink(oif)
+		if ierr != nil {
+			return interfaces, ierr
+		}
+
+		attrs, aerr := syscall.ParseNetlinkRouteAttr(ifmsg)
+		if aerr != nil {
+			return interfaces, aerr
+		}
+
+		for _, attr := range attrs {
+			if attr.Attr.Type == syscall.IFLA_IFNAME {
+				// key is an interface name
+				// possible values: 2 - AF_INET, 10 - AF_INET6, 12 - dualstack
+				interfaces[string(attr.Value[:len(attr.Value)-1])] += family
+			}
+		}
+	}
+	if len(interfaces) > 0 {
+		return interfaces, nil
+	}
+	return interfaces, errNoDefaultInterface
+}
+
+// parsePREFSRC returns preferred source address and output interface index (RTA_OIF).
+func parsePREFSRC(m *syscall.NetlinkMessage) (host string, oif uint32, err error) {
+	var attrs []syscall.NetlinkRouteAttr
+	attrs, err = syscall.ParseNetlinkRouteAttr(m)
+	if err != nil {
+		return "", 0, err
+	}
+
+	for _, attr := range attrs {
+		if attr.Attr.Type == syscall.RTA_PREFSRC {
+			host = net.IP(attr.Value).String()
+		}
+		if attr.Attr.Type == syscall.RTA_OIF {
+			oif = cpuutil.ByteOrder().Uint32(attr.Value)
+		}
+		if host != "" && oif != uint32(0) {
+			break
+		}
+	}
+
+	if oif == 0 {
+		err = errNoDefaultRoute
+	}
+	return host, oif, err
+}