Merge pull request #124 from crawford/networkd

feat(networkd): Adding support for debian-interface-to-networkd conversion

coreos-cloudinit.go

@@ -1,23 +1,21 @@
 package main
 
 import (
+	"encoding/json"
 	"flag"
 	"fmt"
-	"log"
+	"io/ioutil"
 	"os"
+	"path"
 
 	"github.com/coreos/coreos-cloudinit/datasource"
 	"github.com/coreos/coreos-cloudinit/initialize"
+	"github.com/coreos/coreos-cloudinit/network"
 	"github.com/coreos/coreos-cloudinit/system"
 )
 
 const version = "0.7.3+git"
 
-func init() {
-	//Removes timestamp since it is displayed already during booting
-	log.SetFlags(0)
-}
-
 func main() {
 	var printVersion bool
 	flag.BoolVar(&printVersion, "version", false, "Print the version and exit")
@@ -28,12 +26,18 @@ func main() {
 	var file string
 	flag.StringVar(&file, "from-file", "", "Read user-data from provided file")
 
+	var configdrive string
+	flag.StringVar(&configdrive, "from-configdrive", "", "Read user-data from provided cloud-drive directory")
+
 	var url string
 	flag.StringVar(&url, "from-url", "", "Download user-data from provided url")
 
 	var useProcCmdline bool
 	flag.BoolVar(&useProcCmdline, "from-proc-cmdline", false, fmt.Sprintf("Parse %s for '%s=<url>', using the cloud-config served by an HTTP GET to <url>", datasource.ProcCmdlineLocation, datasource.ProcCmdlineCloudConfigFlag))
 
+	var convertNetconf string
+	flag.StringVar(&convertNetconf, "convert-netconf", "", "Read the network config provided in cloud-drive and translate it from the specified format into networkd unit files (requires the -from-configdrive flag)")
+
 	var workspace string
 	flag.StringVar(&workspace, "workspace", "/var/lib/coreos-cloudinit", "Base directory coreos-cloudinit should use to store data")
 
@@ -52,17 +56,32 @@ func main() {
 		ds = datasource.NewLocalFile(file)
 	} else if url != "" {
 		ds = datasource.NewMetadataService(url)
+	} else if configdrive != "" {
+		ds = datasource.NewConfigDrive(configdrive)
 	} else if useProcCmdline {
 		ds = datasource.NewProcCmdline()
 	} else {
-		fmt.Println("Provide one of --from-file, --from-url or --from-proc-cmdline")
+		fmt.Println("Provide one of --from-file, --from-configdrive, --from-url or --from-proc-cmdline")
 		os.Exit(1)
 	}
 
-	log.Printf("Fetching user-data from datasource of type %q", ds.Type())
+	if convertNetconf != "" && configdrive == "" {
+		fmt.Println("-convert-netconf flag requires -from-configdrive")
+		os.Exit(1)
+	}
+
+	switch convertNetconf {
+	case "":
+	case "debian":
+	default:
+		fmt.Printf("Invalid option to -convert-netconf: '%s'. Supported options: 'debian'\n", convertNetconf)
+		os.Exit(1)
+	}
+
+	fmt.Printf("Fetching user-data from datasource of type %q\n", ds.Type())
 	userdataBytes, err := ds.Fetch()
 	if err != nil {
-		log.Printf("Failed fetching user-data from datasource: %v", err)
+		fmt.Printf("Failed fetching user-data from datasource: %v\n", err)
 		if ignoreFailure {
 			os.Exit(0)
 		} else {
@@ -70,29 +89,41 @@ func main() {
 		}
 	}
 
-	if len(userdataBytes) == 0 {
-		log.Printf("No user data to handle, exiting.")
-		os.Exit(0)
+	env := initialize.NewEnvironment("/", workspace)
+	if len(userdataBytes) > 0 {
+		if err := processUserdata(string(userdataBytes), env); err != nil {
+			fmt.Printf("Failed resolving user-data: %v\n", err)
+			if !ignoreFailure {
+				os.Exit(1)
+			}
+		}
+	} else {
+		fmt.Println("No user data to handle.")
 	}
 
-	env := initialize.NewEnvironment("/", workspace)
+	if convertNetconf != "" {
+		if err := processNetconf(convertNetconf, configdrive); err != nil {
+			fmt.Printf("Failed to process network config: %v\n", err)
+			if !ignoreFailure {
+				os.Exit(1)
+			}
+		}
+	}
+}
 
-	userdata := string(userdataBytes)
+func processUserdata(userdata string, env *initialize.Environment) error {
 	userdata = env.Apply(userdata)
 
 	parsed, err := initialize.ParseUserData(userdata)
 	if err != nil {
-		log.Printf("Failed parsing user-data: %v", err)
-		if ignoreFailure {
-			os.Exit(0)
-		} else {
-			os.Exit(1)
-		}
+		fmt.Printf("Failed parsing user-data: %v\n", err)
+		return err
 	}
 
 	err = initialize.PrepWorkspace(env.Workspace())
 	if err != nil {
-		log.Fatalf("Failed preparing workspace: %v", err)
+		fmt.Printf("Failed preparing workspace: %v\n", err)
+		return err
 	}
 
 	switch t := parsed.(type) {
@@ -104,11 +135,54 @@ func main() {
 		if err == nil {
 			var name string
 			name, err = system.ExecuteScript(path)
-			initialize.PersistUnitNameInWorkspace(name, workspace)
+			initialize.PersistUnitNameInWorkspace(name, env.Workspace())
 		}
 	}
 
+	return err
+}
+
+func processNetconf(convertNetconf, configdrive string) error {
+	openstackRoot := path.Join(configdrive, "openstack")
+	metadataFilename := path.Join(openstackRoot, "latest", "meta_data.json")
+	metadataBytes, err := ioutil.ReadFile(metadataFilename)
 	if err != nil {
-		log.Fatalf("Failed resolving user-data: %v", err)
+		return err
 	}
+
+	var metadata struct {
+		NetworkConfig struct {
+			ContentPath string `json:"content_path"`
+		} `json:"network_config"`
+	}
+	if err := json.Unmarshal(metadataBytes, &metadata); err != nil {
+		return err
+	}
+	configPath := metadata.NetworkConfig.ContentPath
+	if configPath == "" {
+		fmt.Printf("No network config specified in %q.\n", metadataFilename)
+		return nil
+	}
+
+	netconfBytes, err := ioutil.ReadFile(path.Join(openstackRoot, configPath))
+	if err != nil {
+		return err
+	}
+
+	var interfaces []network.InterfaceGenerator
+	switch convertNetconf {
+	case "debian":
+		interfaces, err = network.ProcessDebianNetconf(string(netconfBytes))
+	default:
+		return fmt.Errorf("Unsupported network config format %q", convertNetconf)
+	}
+
+	if err != nil {
+		return err
+	}
+
+	if err := system.WriteNetworkdConfigs(interfaces); err != nil {
+		return err
+	}
+	return system.RestartNetwork(interfaces)
 }

datasource/configdrive.go

@@ -0,0 +1,27 @@
+package datasource
+
+import (
+	"io/ioutil"
+	"os"
+	"path"
+)
+
+type configDrive struct {
+	path string
+}
+
+func NewConfigDrive(path string) *configDrive {
+	return &configDrive{path}
+}
+
+func (self *configDrive) Fetch() ([]byte, error) {
+	data, err := ioutil.ReadFile(path.Join(self.path, "openstack", "latest", "user_data"))
+	if os.IsNotExist(err) {
+		err = nil
+	}
+	return data, err
+}
+
+func (self *configDrive) Type() string {
+	return "cloud-drive"
+}

network/interface.go

@@ -0,0 +1,193 @@
+package network
+
+import (
+	"fmt"
+	"strconv"
+)
+
+type InterfaceGenerator interface {
+	Name() string
+	Netdev() string
+	Link() string
+	Network() string
+}
+
+type logicalInterface struct {
+	name     string
+	config   configMethod
+	children []InterfaceGenerator
+}
+
+func (i *logicalInterface) Network() string {
+	config := fmt.Sprintf("[Match]\nName=%s\n\n[Network]\n", i.name)
+
+	for _, child := range i.children {
+		switch iface := child.(type) {
+		case *vlanInterface:
+			config += fmt.Sprintf("VLAN=%s\n", iface.name)
+		case *bondInterface:
+			config += fmt.Sprintf("Bond=%s\n", iface.name)
+		}
+	}
+
+	switch conf := i.config.(type) {
+	case configMethodStatic:
+		for _, nameserver := range conf.nameservers {
+			config += fmt.Sprintf("DNS=%s\n", nameserver)
+		}
+		if conf.address.IP != nil {
+			config += fmt.Sprintf("\n[Address]\nAddress=%s\n", conf.address.String())
+		}
+		for _, route := range conf.routes {
+			config += fmt.Sprintf("\n[Route]\nDestination=%s\nGateway=%s\n", route.destination.String(), route.gateway)
+		}
+	case configMethodDHCP:
+		config += "DHCP=true\n"
+	}
+
+	return config
+}
+
+type physicalInterface struct {
+	logicalInterface
+}
+
+func (p *physicalInterface) Name() string {
+	return p.name
+}
+
+func (p *physicalInterface) Netdev() string {
+	return ""
+}
+
+func (p *physicalInterface) Link() string {
+	return ""
+}
+
+type bondInterface struct {
+	logicalInterface
+	slaves []string
+}
+
+func (b *bondInterface) Name() string {
+	return b.name
+}
+
+func (b *bondInterface) Netdev() string {
+	return fmt.Sprintf("[NetDev]\nKind=bond\nName=%s\n", b.name)
+}
+
+func (b *bondInterface) Link() string {
+	return ""
+}
+
+type vlanInterface struct {
+	logicalInterface
+	id        int
+	rawDevice string
+}
+
+func (v *vlanInterface) Name() string {
+	return v.name
+}
+
+func (v *vlanInterface) Netdev() string {
+	return fmt.Sprintf("[NetDev]\nKind=vlan\nName=%s\n\n[VLAN]\nId=%d\n", v.name, v.id)
+}
+
+func (v *vlanInterface) Link() string {
+	return ""
+}
+
+func buildInterfaces(stanzas []*stanzaInterface) []InterfaceGenerator {
+	bondStanzas := make(map[string]*stanzaInterface)
+	physicalStanzas := make(map[string]*stanzaInterface)
+	vlanStanzas := make(map[string]*stanzaInterface)
+	for _, iface := range stanzas {
+		switch iface.kind {
+		case interfaceBond:
+			bondStanzas[iface.name] = iface
+		case interfacePhysical:
+			physicalStanzas[iface.name] = iface
+		case interfaceVLAN:
+			vlanStanzas[iface.name] = iface
+		}
+	}
+
+	physicals := make(map[string]*physicalInterface)
+	for _, p := range physicalStanzas {
+		if _, ok := p.configMethod.(configMethodLoopback); ok {
+			continue
+		}
+		physicals[p.name] = &physicalInterface{
+			logicalInterface{
+				name:     p.name,
+				config:   p.configMethod,
+				children: []InterfaceGenerator{},
+			},
+		}
+	}
+
+	bonds := make(map[string]*bondInterface)
+	for _, b := range bondStanzas {
+		bonds[b.name] = &bondInterface{
+			logicalInterface{
+				name:     b.name,
+				config:   b.configMethod,
+				children: []InterfaceGenerator{},
+			},
+			b.options["slaves"],
+		}
+	}
+
+	vlans := make(map[string]*vlanInterface)
+	for _, v := range vlanStanzas {
+		var rawDevice string
+		id, _ := strconv.Atoi(v.options["id"][0])
+		if device := v.options["raw_device"]; len(device) == 1 {
+			rawDevice = device[0]
+		}
+		vlans[v.name] = &vlanInterface{
+			logicalInterface{
+				name:     v.name,
+				config:   v.configMethod,
+				children: []InterfaceGenerator{},
+			},
+			id,
+			rawDevice,
+		}
+	}
+
+	for _, vlan := range vlans {
+		if physical, ok := physicals[vlan.rawDevice]; ok {
+			physical.children = append(physical.children, vlan)
+		}
+		if bond, ok := bonds[vlan.rawDevice]; ok {
+			bond.children = append(bond.children, vlan)
+		}
+	}
+
+	for _, bond := range bonds {
+		for _, slave := range bond.slaves {
+			if physical, ok := physicals[slave]; ok {
+				physical.children = append(physical.children, bond)
+			}
+			if pBond, ok := bonds[slave]; ok {
+				pBond.children = append(pBond.children, bond)
+			}
+		}
+	}
+
+	interfaces := make([]InterfaceGenerator, 0, len(physicals)+len(bonds)+len(vlans))
+	for _, physical := range physicals {
+		interfaces = append(interfaces, physical)
+	}
+	for _, bond := range bonds {
+		interfaces = append(interfaces, bond)
+	}
+	for _, vlan := range vlans {
+		interfaces = append(interfaces, vlan)
+	}
+
+	return interfaces
+}

network/interface_test.go

@@ -0,0 +1,321 @@
+package network
+
+import (
+	"net"
+	"reflect"
+	"testing"
+)
+
+func TestPhysicalInterfaceName(t *testing.T) {
+	p := physicalInterface{logicalInterface{name: "testname"}}
+	if p.Name() != "testname" {
+		t.FailNow()
+	}
+}
+
+func TestPhysicalInterfaceNetdev(t *testing.T) {
+	p := physicalInterface{}
+	if p.Netdev() != "" {
+		t.FailNow()
+	}
+}
+
+func TestPhysicalInterfaceLink(t *testing.T) {
+	p := physicalInterface{}
+	if p.Link() != "" {
+		t.FailNow()
+	}
+}
+
+func TestPhysicalInterfaceNetwork(t *testing.T) {
+	p := physicalInterface{logicalInterface{
+		name: "testname",
+		children: []InterfaceGenerator{
+			&bondInterface{
+				logicalInterface{
+					name: "testbond1",
+				},
+				nil,
+			},
+			&vlanInterface{
+				logicalInterface{
+					name: "testvlan1",
+				},
+				1,
+				"",
+			},
+			&vlanInterface{
+				logicalInterface{
+					name: "testvlan2",
+				},
+				1,
+				"",
+			},
+		},
+	}}
+	network := `[Match]
+Name=testname
+
+[Network]
+Bond=testbond1
+VLAN=testvlan1
+VLAN=testvlan2
+`
+	if p.Network() != network {
+		t.FailNow()
+	}
+}
+
+func TestBondInterfaceName(t *testing.T) {
+	b := bondInterface{logicalInterface{name: "testname"}, nil}
+	if b.Name() != "testname" {
+		t.FailNow()
+	}
+}
+
+func TestBondInterfaceNetdev(t *testing.T) {
+	b := bondInterface{logicalInterface{name: "testname"}, nil}
+	netdev := `[NetDev]
+Kind=bond
+Name=testname
+`
+	if b.Netdev() != netdev {
+		t.FailNow()
+	}
+}
+
+func TestBondInterfaceLink(t *testing.T) {
+	b := bondInterface{}
+	if b.Link() != "" {
+		t.FailNow()
+	}
+}
+
+func TestBondInterfaceNetwork(t *testing.T) {
+	b := bondInterface{
+		logicalInterface{
+			name:   "testname",
+			config: configMethodDHCP{},
+			children: []InterfaceGenerator{
+				&bondInterface{
+					logicalInterface{
+						name: "testbond1",
+					},
+					nil,
+				},
+				&vlanInterface{
+					logicalInterface{
+						name: "testvlan1",
+					},
+					1,
+					"",
+				},
+				&vlanInterface{
+					logicalInterface{
+						name: "testvlan2",
+					},
+					1,
+					"",
+				},
+			},
+		},
+		nil,
+	}
+	network := `[Match]
+Name=testname
+
+[Network]
+Bond=testbond1
+VLAN=testvlan1
+VLAN=testvlan2
+DHCP=true
+`
+	if b.Network() != network {
+		t.FailNow()
+	}
+}
+
+func TestVLANInterfaceName(t *testing.T) {
+	v := vlanInterface{logicalInterface{name: "testname"}, 1, ""}
+	if v.Name() != "testname" {
+		t.FailNow()
+	}
+}
+
+func TestVLANInterfaceNetdev(t *testing.T) {
+	v := vlanInterface{logicalInterface{name: "testname"}, 1, ""}
+	netdev := `[NetDev]
+Kind=vlan
+Name=testname
+
+[VLAN]
+Id=1
+`
+	if v.Netdev() != netdev {
+		t.FailNow()
+	}
+}
+
+func TestVLANInterfaceLink(t *testing.T) {
+	v := vlanInterface{}
+	if v.Link() != "" {
+		t.FailNow()
+	}
+}
+
+func TestVLANInterfaceNetwork(t *testing.T) {
+	v := vlanInterface{
+		logicalInterface{
+			name: "testname",
+			config: configMethodStatic{
+				address: net.IPNet{
+					IP:   []byte{192, 168, 1, 100},
+					Mask: []byte{255, 255, 255, 0},
+				},
+				nameservers: []net.IP{
+					[]byte{8, 8, 8, 8},
+				},
+				routes: []route{
+					route{
+						destination: net.IPNet{
+							IP:   []byte{0, 0, 0, 0},
+							Mask: []byte{0, 0, 0, 0},
+						},
+						gateway: []byte{1, 2, 3, 4},
+					},
+				},
+			},
+		},
+		0,
+		"",
+	}
+	network := `[Match]
+Name=testname
+
+[Network]
+DNS=8.8.8.8
+
+[Address]
+Address=192.168.1.100/24
+
+[Route]
+Destination=0.0.0.0/0
+Gateway=1.2.3.4
+`
+	if v.Network() != network {
+		t.Log(v.Network())
+		t.FailNow()
+	}
+}
+
+func TestBuildInterfacesLo(t *testing.T) {
+	stanzas := []*stanzaInterface{
+		&stanzaInterface{
+			name:         "lo",
+			kind:         interfacePhysical,
+			auto:         false,
+			configMethod: configMethodLoopback{},
+			options:      map[string][]string{},
+		},
+	}
+	interfaces := buildInterfaces(stanzas)
+	if len(interfaces) != 0 {
+		t.FailNow()
+	}
+}
+
+func TestBuildInterfaces(t *testing.T) {
+	stanzas := []*stanzaInterface{
+		&stanzaInterface{
+			name:         "eth0",
+			kind:         interfacePhysical,
+			auto:         false,
+			configMethod: configMethodManual{},
+			options:      map[string][]string{},
+		},
+		&stanzaInterface{
+			name:         "bond0",
+			kind:         interfaceBond,
+			auto:         false,
+			configMethod: configMethodManual{},
+			options: map[string][]string{
+				"slaves": []string{"eth0"},
+			},
+		},
+		&stanzaInterface{
+			name:         "bond1",
+			kind:         interfaceBond,
+			auto:         false,
+			configMethod: configMethodManual{},
+			options: map[string][]string{
+				"slaves": []string{"bond0"},
+			},
+		},
+		&stanzaInterface{
+			name:         "vlan0",
+			kind:         interfaceVLAN,
+			auto:         false,
+			configMethod: configMethodManual{},
+			options: map[string][]string{
+				"id":         []string{"0"},
+				"raw_device": []string{"eth0"},
+			},
+		},
+		&stanzaInterface{
+			name:         "vlan1",
+			kind:         interfaceVLAN,
+			auto:         false,
+			configMethod: configMethodManual{},
+			options: map[string][]string{
+				"id":         []string{"1"},
+				"raw_device": []string{"bond0"},
+			},
+		},
+	}
+	interfaces := buildInterfaces(stanzas)
+	vlan1 := &vlanInterface{
+		logicalInterface{
+			name:     "vlan1",
+			config:   configMethodManual{},
+			children: []InterfaceGenerator{},
+		},
+		1,
+		"bond0",
+	}
+	vlan0 := &vlanInterface{
+		logicalInterface{
+			name:     "vlan0",
+			config:   configMethodManual{},
+			children: []InterfaceGenerator{},
+		},
+		0,
+		"eth0",
+	}
+	bond1 := &bondInterface{
+		logicalInterface{
+			name:     "bond1",
+			config:   configMethodManual{},
+			children: []InterfaceGenerator{},
+		},
+		[]string{"bond0"},
+	}
+	bond0 := &bondInterface{
+		logicalInterface{
+			name:     "bond0",
+			config:   configMethodManual{},
+			children: []InterfaceGenerator{vlan1, bond1},
+		},
+		[]string{"eth0"},
+	}
+	eth0 := &physicalInterface{
+		logicalInterface{
+			name:     "eth0",
+			config:   configMethodManual{},
+			children: []InterfaceGenerator{vlan0, bond0},
+		},
+	}
+	expect := []InterfaceGenerator{eth0, bond0, bond1, vlan0, vlan1}
+	if !reflect.DeepEqual(interfaces, expect) {
+		t.FailNow()
+	}
+}

network/network.go

@@ -0,0 +1,45 @@
+package network
+
+import (
+	"strings"
+)
+
+func ProcessDebianNetconf(config string) ([]InterfaceGenerator, error) {
+	lines := formatConfig(config)
+	stanzas, err := parseStanzas(lines)
+	if err != nil {
+		return nil, err
+	}
+
+	interfaces := make([]*stanzaInterface, 0, len(stanzas))
+	for _, stanza := range stanzas {
+		switch s := stanza.(type) {
+		case *stanzaInterface:
+			interfaces = append(interfaces, s)
+		}
+	}
+
+	return buildInterfaces(interfaces), nil
+}
+
+func formatConfig(config string) []string {
+	lines := []string{}
+	config = strings.Replace(config, "\\\n", "", -1)
+	for config != "" {
+		split := strings.SplitN(config, "\n", 2)
+		line := strings.TrimSpace(split[0])
+
+		if len(split) == 2 {
+			config = split[1]
+		} else {
+			config = ""
+		}
+
+		if strings.HasPrefix(line, "#") || line == "" {
+			continue
+		}
+
+		lines = append(lines, line)
+	}
+	return lines
+}

network/network_test.go

@@ -0,0 +1,42 @@
+package network
+
+import (
+	"testing"
+)
+
+func TestFormatConfigs(t *testing.T) {
+	for in, n := range map[string]int{
+		"":                                                    0,
+		"line1\\\nis long":                                    1,
+		"#comment":                                            0,
+		"#comment\\\ncomment":                                 0,
+		"  #comment \\\n comment\nline 1\nline 2\\\n is long": 2,
+	} {
+		lines := formatConfig(in)
+		if len(lines) != n {
+			t.Fatalf("bad number of lines for config %q: got %d, want %d", in, len(lines), n)
+		}
+	}
+}
+
+func TestProcessDebianNetconf(t *testing.T) {
+	for _, tt := range []struct {
+		in   string
+		fail bool
+		n    int
+	}{
+		{"", false, 0},
+		{"iface", true, -1},
+		{"auto eth1\nauto eth2", false, 0},
+		{"iface eth1 inet manual", false, 1},
+	} {
+		interfaces, err := ProcessDebianNetconf(tt.in)
+		failed := err != nil
+		if tt.fail != failed {
+			t.Fatalf("bad failure state for %q: got %b, want %b", failed, tt.fail)
+		}
+		if tt.n != -1 && tt.n != len(interfaces) {
+			t.Fatalf("bad number of interfaces for %q: got %d, want %q", tt.in, len(interfaces), tt.n)
+		}
+	}
+}

network/stanza.go

@@ -0,0 +1,295 @@
+package network
+
+import (
+	"fmt"
+	"net"
+	"strconv"
+	"strings"
+)
+
+type stanza interface{}
+
+type stanzaAuto struct {
+	interfaces []string
+}
+
+type stanzaInterface struct {
+	name         string
+	kind         interfaceKind
+	auto         bool
+	configMethod configMethod
+	options      map[string][]string
+}
+
+type interfaceKind int
+
+const (
+	interfaceBond = interfaceKind(iota)
+	interfacePhysical
+	interfaceVLAN
+)
+
+type route struct {
+	destination net.IPNet
+	gateway     net.IP
+}
+
+type configMethod interface{}
+
+type configMethodStatic struct {
+	address     net.IPNet
+	nameservers []net.IP
+	routes      []route
+}
+
+type configMethodLoopback struct{}
+
+type configMethodManual struct{}
+
+type configMethodDHCP struct{}
+
+func parseStanzas(lines []string) (stanzas []stanza, err error) {
+	rawStanzas, err := splitStanzas(lines)
+	if err != nil {
+		return nil, err
+	}
+
+	stanzas = make([]stanza, 0, len(rawStanzas))
+	for _, rawStanza := range rawStanzas {
+		if stanza, err := parseStanza(rawStanza); err == nil {
+			stanzas = append(stanzas, stanza)
+		} else {
+			return nil, err
+		}
+	}
+
+	autos := make([]string, 0)
+	interfaceMap := make(map[string]*stanzaInterface)
+	for _, stanza := range stanzas {
+		switch c := stanza.(type) {
+		case *stanzaAuto:
+			autos = append(autos, c.interfaces...)
+		case *stanzaInterface:
+			interfaceMap[c.name] = c
+		}
+	}
+
+	// Apply the auto attribute
+	for _, auto := range autos {
+		if iface, ok := interfaceMap[auto]; ok {
+			iface.auto = true
+		}
+	}
+
+	return stanzas, nil
+}
+
+func splitStanzas(lines []string) ([][]string, error) {
+	var curStanza []string
+	stanzas := make([][]string, 0)
+	for _, line := range lines {
+		if isStanzaStart(line) {
+			if curStanza != nil {
+				stanzas = append(stanzas, curStanza)
+			}
+			curStanza = []string{line}
+		} else if curStanza != nil {
+			curStanza = append(curStanza, line)
+		} else {
+			return nil, fmt.Errorf("missing stanza start '%s'", line)
+		}
+	}
+
+	if curStanza != nil {
+		stanzas = append(stanzas, curStanza)
+	}
+
+	return stanzas, nil
+}
+
+func isStanzaStart(line string) bool {
+	switch strings.Split(line, " ")[0] {
+	case "auto":
+		fallthrough
+	case "iface":
+		fallthrough
+	case "mapping":
+		return true
+	}
+
+	if strings.HasPrefix(line, "allow-") {
+		return true
+	}
+
+	return false
+}
+
+func parseStanza(rawStanza []string) (stanza, error) {
+	if len(rawStanza) == 0 {
+		panic("empty stanza")
+	}
+	tokens := strings.Fields(rawStanza[0])
+	if len(tokens) < 2 {
+		return nil, fmt.Errorf("malformed stanza start %q", rawStanza[0])
+	}
+
+	kind := tokens[0]
+	attributes := tokens[1:]
+
+	switch kind {
+	case "auto":
+		return parseAutoStanza(attributes, rawStanza[1:])
+	case "iface":
+		return parseInterfaceStanza(attributes, rawStanza[1:])
+	default:
+		return nil, fmt.Errorf("unknown stanza '%s'", kind)
+	}
+}
+
+func parseAutoStanza(attributes []string, options []string) (*stanzaAuto, error) {
+	return &stanzaAuto{interfaces: attributes}, nil
+}
+
+func parseInterfaceStanza(attributes []string, options []string) (*stanzaInterface, error) {
+	if len(attributes) != 3 {
+		return nil, fmt.Errorf("incorrect number of attributes")
+	}
+
+	iface := attributes[0]
+	confMethod := attributes[2]
+
+	optionMap := make(map[string][]string, 0)
+	for _, option := range options {
+		if strings.HasPrefix(option, "post-up") {
+			tokens := strings.SplitAfterN(option, " ", 2)
+			if len(tokens) != 2 {
+				continue
+			}
+			if v, ok := optionMap["post-up"]; ok {
+				optionMap["post-up"] = append(v, tokens[1])
+			} else {
+				optionMap["post-up"] = []string{tokens[1]}
+			}
+		} else if strings.HasPrefix(option, "pre-down") {
+			tokens := strings.SplitAfterN(option, " ", 2)
+			if len(tokens) != 2 {
+				continue
+			}
+			if v, ok := optionMap["pre-down"]; ok {
+				optionMap["pre-down"] = append(v, tokens[1])
+			} else {
+				optionMap["pre-down"] = []string{tokens[1]}
+			}
+		} else {
+			tokens := strings.Fields(option)
+			optionMap[tokens[0]] = tokens[1:]
+		}
+	}
+
+	var conf configMethod
+	switch confMethod {
+	case "static":
+		config := configMethodStatic{
+			routes:      make([]route, 0),
+			nameservers: make([]net.IP, 0),
+		}
+		if addresses, ok := optionMap["address"]; ok {
+			if len(addresses) == 1 {
+				config.address.IP = net.ParseIP(addresses[0])
+			}
+		}
+		if netmasks, ok := optionMap["netmask"]; ok {
+			if len(netmasks) == 1 {
+				config.address.Mask = net.IPMask(net.ParseIP(netmasks[0]).To4())
+			}
+		}
+		if config.address.IP == nil || config.address.Mask == nil {
+			return nil, fmt.Errorf("malformed static network config for '%s'", iface)
+		}
+		if gateways, ok := optionMap["gateway"]; ok {
+			if len(gateways) == 1 {
+				config.routes = append(config.routes, route{
+					destination: net.IPNet{
+						IP:   net.IPv4(0, 0, 0, 0),
+						Mask: net.IPv4Mask(0, 0, 0, 0),
+					},
+					gateway: net.ParseIP(gateways[0]),
+				})
+			}
+		}
+		for _, nameserver := range optionMap["dns-nameservers"] {
+			config.nameservers = append(config.nameservers, net.ParseIP(nameserver))
+		}
+		for _, postup := range optionMap["post-up"] {
+			if strings.HasPrefix(postup, "route add") {
+				route := route{}
+				fields := strings.Fields(postup)
+				for i, field := range fields[:len(fields)-1] {
+					switch field {
+					case "-net":
+						route.destination.IP = net.ParseIP(fields[i+1])
+					case "netmask":
+						route.destination.Mask = net.IPMask(net.ParseIP(fields[i+1]).To4())
+					case "gw":
+						route.gateway = net.ParseIP(fields[i+1])
+					}
+				}
+				if route.destination.IP != nil && route.destination.Mask != nil && route.gateway != nil {
+					config.routes = append(config.routes, route)
+				}
+			}
+		}
+		conf = config
+	case "loopback":
+		conf = configMethodLoopback{}
+	case "manual":
+		conf = configMethodManual{}
+	case "dhcp":
+		conf = configMethodDHCP{}
+	default:
+		return nil, fmt.Errorf("invalid config method '%s'", confMethod)
+	}
+
+	if _, ok := optionMap["vlan_raw_device"]; ok {
+		return parseVLANStanza(iface, conf, attributes, optionMap)
+	}
+
+	if strings.Contains(iface, ".") {
+		return parseVLANStanza(iface, conf, attributes, optionMap)
+	}
+
+	if _, ok := optionMap["bond-slaves"]; ok {
+		return parseBondStanza(iface, conf, attributes, optionMap)
+	}
+
+	return parsePhysicalStanza(iface, conf, attributes, optionMap)
+}
+
+func parseBondStanza(iface string, conf configMethod, attributes []string, options map[string][]string) (*stanzaInterface, error) {
+	options["slaves"] = options["bond-slaves"]
+	return &stanzaInterface{name: iface, kind: interfaceBond, configMethod: conf, options: options}, nil
+}
+
+func parsePhysicalStanza(iface string, conf configMethod, attributes []string, options map[string][]string) (*stanzaInterface, error) {
+	return &stanzaInterface{name: iface, kind: interfacePhysical, configMethod: conf, options: options}, nil
+}
+
+func parseVLANStanza(iface string, conf configMethod, attributes []string, options map[string][]string) (*stanzaInterface, error) {
+	var id string
+	if strings.Contains(iface, ".") {
+		tokens := strings.Split(iface, ".")
+		id = tokens[len(tokens)-1]
+	} else if strings.HasPrefix(iface, "vlan") {
+		id = strings.TrimPrefix(iface, "vlan")
+	} else {
+		return nil, fmt.Errorf("malformed vlan name %s", iface)
+	}
+
+	if _, err := strconv.Atoi(id); err != nil {
+		return nil, fmt.Errorf("malformed vlan name %s", iface)
+	}
+	options["id"] = []string{id}
+	options["raw_device"] = options["vlan_raw_device"]
+
+	return &stanzaInterface{name: iface, kind: interfaceVLAN, configMethod: conf, options: options}, nil
+}

network/stanza_test.go

@@ -0,0 +1,502 @@
+package network
+
+import (
+	"net"
+	"reflect"
+	"strings"
+	"testing"
+)
+
+func TestSplitStanzasNoParent(t *testing.T) {
+	in := []string{"test"}
+	e := "missing stanza start"
+	_, err := splitStanzas(in)
+	if err == nil || !strings.HasPrefix(err.Error(), e) {
+		t.Fatalf("bad error for splitStanzas(%q): got %q, want %q", in, err, e)
+	}
+}
+
+func TestBadParseStanzas(t *testing.T) {
+	for in, e := range map[string]string{
+		"":                 "missing stanza start",
+		"iface":            "malformed stanza start",
+		"allow-?? unknown": "unknown stanza",
+	} {
+		_, err := parseStanzas([]string{in})
+		if err == nil || !strings.HasPrefix(err.Error(), e) {
+			t.Fatalf("bad error for parseStanzas(%q): got %q, want %q", in, err, e)
+		}
+
+	}
+}
+
+func TestBadParseInterfaceStanza(t *testing.T) {
+	for _, tt := range []struct {
+		in   []string
+		opts []string
+		e    string
+	}{
+		{[]string{}, nil, "incorrect number of attributes"},
+		{[]string{"eth", "inet", "invalid"}, nil, "invalid config method"},
+		{[]string{"eth", "inet", "static"}, []string{"address 192.168.1.100"}, "malformed static network config"},
+		{[]string{"eth", "inet", "static"}, []string{"netmask 255.255.255.0"}, "malformed static network config"},
+		{[]string{"eth", "inet", "static"}, []string{"address invalid", "netmask 255.255.255.0"}, "malformed static network config"},
+		{[]string{"eth", "inet", "static"}, []string{"address 192.168.1.100", "netmask invalid"}, "malformed static network config"},
+	} {
+		_, err := parseInterfaceStanza(tt.in, tt.opts)
+		if err == nil || !strings.HasPrefix(err.Error(), tt.e) {
+			t.Fatalf("bad error parsing interface stanza %q: got %q, want %q", tt.in, err.Error(), tt.e)
+		}
+	}
+}
+
+func TestBadParseVLANStanzas(t *testing.T) {
+	conf := configMethodManual{}
+	options := map[string][]string{}
+	for _, in := range []string{"myvlan", "eth.vlan"} {
+		_, err := parseVLANStanza(in, conf, nil, options)
+		if err == nil || !strings.HasPrefix(err.Error(), "malformed vlan name") {
+			t.Fatalf("did not error on bad vlan %q", in)
+		}
+	}
+}
+
+func TestSplitStanzas(t *testing.T) {
+	expect := [][]string{
+		{"auto lo"},
+		{"iface eth1", "option: 1"},
+		{"mapping"},
+		{"allow-"},
+	}
+	lines := make([]string, 0, 5)
+	for _, stanza := range expect {
+		for _, line := range stanza {
+			lines = append(lines, line)
+		}
+	}
+
+	stanzas, err := splitStanzas(lines)
+	if err != nil {
+		t.FailNow()
+	}
+	for i, stanza := range stanzas {
+		if len(stanza) != len(expect[i]) {
+			t.FailNow()
+		}
+		for j, line := range stanza {
+			if line != expect[i][j] {
+				t.FailNow()
+			}
+		}
+	}
+}
+
+func TestParseStanzaNil(t *testing.T) {
+	defer func() {
+		if r := recover(); r == nil {
+			t.Fatal("parseStanza(nil) did not panic")
+		}
+	}()
+	parseStanza(nil)
+}
+
+func TestParseStanzaSuccess(t *testing.T) {
+	for _, in := range []string{
+		"auto a",
+		"iface a inet manual",
+	} {
+		if _, err := parseStanza([]string{in}); err != nil {
+			t.Fatalf("unexpected error parsing stanza %q: %s", in, err)
+		}
+	}
+}
+
+func TestParseAutoStanza(t *testing.T) {
+	interfaces := []string{"test", "attribute"}
+	stanza, err := parseAutoStanza(interfaces, nil)
+	if err != nil {
+		t.Fatalf("unexpected error parsing auto stanza %q: %s", interfaces, err)
+	}
+	if !reflect.DeepEqual(stanza.interfaces, interfaces) {
+		t.FailNow()
+	}
+}
+
+func TestParseBondStanzaNoSlaves(t *testing.T) {
+	bond, err := parseBondStanza("", nil, nil, map[string][]string{})
+	if err != nil {
+		t.FailNow()
+	}
+	if bond.options["slaves"] != nil {
+		t.FailNow()
+	}
+}
+
+func TestParseBondStanza(t *testing.T) {
+	conf := configMethodManual{}
+	options := map[string][]string{
+		"bond-slaves": []string{"1", "2"},
+	}
+	bond, err := parseBondStanza("test", conf, nil, options)
+	if err != nil {
+		t.FailNow()
+	}
+	if bond.name != "test" {
+		t.FailNow()
+	}
+	if bond.kind != interfaceBond {
+		t.FailNow()
+	}
+	if bond.configMethod != conf {
+		t.FailNow()
+	}
+	if !reflect.DeepEqual(bond.options["slaves"], options["bond-slaves"]) {
+		t.FailNow()
+	}
+}
+
+func TestParsePhysicalStanza(t *testing.T) {
+	conf := configMethodManual{}
+	options := map[string][]string{
+		"a": []string{"1", "2"},
+		"b": []string{"1"},
+	}
+	physical, err := parsePhysicalStanza("test", conf, nil, options)
+	if err != nil {
+		t.FailNow()
+	}
+	if physical.name != "test" {
+		t.FailNow()
+	}
+	if physical.kind != interfacePhysical {
+		t.FailNow()
+	}
+	if physical.configMethod != conf {
+		t.FailNow()
+	}
+	if !reflect.DeepEqual(physical.options, options) {
+		t.FailNow()
+	}
+}
+
+func TestParseVLANStanzas(t *testing.T) {
+	conf := configMethodManual{}
+	options := map[string][]string{}
+	for _, in := range []string{"vlan25", "eth.25"} {
+		vlan, err := parseVLANStanza(in, conf, nil, options)
+		if err != nil {
+			t.Fatalf("unexpected error from parseVLANStanza(%q): %s", in, err)
+		}
+		if !reflect.DeepEqual(vlan.options["id"], []string{"25"}) {
+			t.FailNow()
+		}
+	}
+}
+
+func TestParseInterfaceStanzaStaticAddress(t *testing.T) {
+	options := []string{"address 192.168.1.100", "netmask 255.255.255.0"}
+	expect := net.IPNet{
+		IP:   net.IPv4(192, 168, 1, 100),
+		Mask: net.IPv4Mask(255, 255, 255, 0),
+	}
+
+	iface, err := parseInterfaceStanza([]string{"eth", "inet", "static"}, options)
+	if err != nil {
+		t.FailNow()
+	}
+	static, ok := iface.configMethod.(configMethodStatic)
+	if !ok {
+		t.FailNow()
+	}
+	if !reflect.DeepEqual(static.address, expect) {
+		t.FailNow()
+	}
+}
+
+func TestParseInterfaceStanzaStaticGateway(t *testing.T) {
+	options := []string{"address 192.168.1.100", "netmask 255.255.255.0", "gateway 192.168.1.1"}
+	expect := []route{
+		{
+			destination: net.IPNet{
+				IP:   net.IPv4(0, 0, 0, 0),
+				Mask: net.IPv4Mask(0, 0, 0, 0),
+			},
+			gateway: net.IPv4(192, 168, 1, 1),
+		},
+	}
+
+	iface, err := parseInterfaceStanza([]string{"eth", "inet", "static"}, options)
+	if err != nil {
+		t.FailNow()
+	}
+	static, ok := iface.configMethod.(configMethodStatic)
+	if !ok {
+		t.FailNow()
+	}
+	if !reflect.DeepEqual(static.routes, expect) {
+		t.FailNow()
+	}
+}
+
+func TestParseInterfaceStanzaStaticDNS(t *testing.T) {
+	options := []string{"address 192.168.1.100", "netmask 255.255.255.0", "dns-nameservers 192.168.1.10 192.168.1.11 192.168.1.12"}
+	expect := []net.IP{
+		net.IPv4(192, 168, 1, 10),
+		net.IPv4(192, 168, 1, 11),
+		net.IPv4(192, 168, 1, 12),
+	}
+	iface, err := parseInterfaceStanza([]string{"eth", "inet", "static"}, options)
+	if err != nil {
+		t.FailNow()
+	}
+	static, ok := iface.configMethod.(configMethodStatic)
+	if !ok {
+		t.FailNow()
+	}
+	if !reflect.DeepEqual(static.nameservers, expect) {
+		t.FailNow()
+	}
+}
+
+func TestBadParseInterfaceStanzasStaticPostUp(t *testing.T) {
+	for _, in := range []string{
+		"post-up invalid",
+		"post-up route add",
+		"post-up route add -net",
+		"post-up route add gw",
+		"post-up route add netmask",
+		"gateway",
+		"gateway 192.168.1.1 192.168.1.2",
+	} {
+		options := []string{"address 192.168.1.100", "netmask 255.255.255.0", in}
+		iface, err := parseInterfaceStanza([]string{"eth", "inet", "static"}, options)
+		if err != nil {
+			t.Fatalf("parseInterfaceStanza with options %s got unexpected error", options)
+		}
+		static, ok := iface.configMethod.(configMethodStatic)
+		if !ok {
+			t.Fatalf("parseInterfaceStanza with options %s did not return configMethodStatic", options)
+		}
+		if len(static.routes) != 0 {
+			t.Fatalf("parseInterfaceStanza with options %s did not return zero-length static routes", options)
+		}
+	}
+}
+
+func TestParseInterfaceStanzaStaticPostUp(t *testing.T) {
+	options := []string{
+		"address 192.168.1.100",
+		"netmask 255.255.255.0",
+		"post-up route add gw 192.168.1.1 -net 192.168.1.0 netmask 255.255.255.0",
+	}
+	expect := []route{
+		{
+			destination: net.IPNet{
+				IP:   net.IPv4(192, 168, 1, 0),
+				Mask: net.IPv4Mask(255, 255, 255, 0),
+			},
+			gateway: net.IPv4(192, 168, 1, 1),
+		},
+	}
+
+	iface, err := parseInterfaceStanza([]string{"eth", "inet", "static"}, options)
+	if err != nil {
+		t.FailNow()
+	}
+	static, ok := iface.configMethod.(configMethodStatic)
+	if !ok {
+		t.FailNow()
+	}
+	if !reflect.DeepEqual(static.routes, expect) {
+		t.FailNow()
+	}
+}
+
+func TestParseInterfaceStanzaLoopback(t *testing.T) {
+	iface, err := parseInterfaceStanza([]string{"eth", "inet", "loopback"}, nil)
+	if err != nil {
+		t.FailNow()
+	}
+	if _, ok := iface.configMethod.(configMethodLoopback); !ok {
+		t.FailNow()
+	}
+}
+
+func TestParseInterfaceStanzaManual(t *testing.T) {
+	iface, err := parseInterfaceStanza([]string{"eth", "inet", "manual"}, nil)
+	if err != nil {
+		t.FailNow()
+	}
+	if _, ok := iface.configMethod.(configMethodManual); !ok {
+		t.FailNow()
+	}
+}
+
+func TestParseInterfaceStanzaDHCP(t *testing.T) {
+	iface, err := parseInterfaceStanza([]string{"eth", "inet", "dhcp"}, nil)
+	if err != nil {
+		t.FailNow()
+	}
+	if _, ok := iface.configMethod.(configMethodDHCP); !ok {
+		t.FailNow()
+	}
+}
+
+func TestParseInterfaceStanzaPostUpOption(t *testing.T) {
+	options := []string{
+		"post-up",
+		"post-up 1 2",
+		"post-up 3 4",
+	}
+	iface, err := parseInterfaceStanza([]string{"eth", "inet", "manual"}, options)
+	if err != nil {
+		t.FailNow()
+	}
+	if !reflect.DeepEqual(iface.options["post-up"], []string{"1 2", "3 4"}) {
+		t.Log(iface.options["post-up"])
+		t.FailNow()
+	}
+}
+
+func TestParseInterfaceStanzaPreDownOption(t *testing.T) {
+	options := []string{
+		"pre-down",
+		"pre-down 3",
+		"pre-down 4",
+	}
+	iface, err := parseInterfaceStanza([]string{"eth", "inet", "manual"}, options)
+	if err != nil {
+		t.FailNow()
+	}
+	if !reflect.DeepEqual(iface.options["pre-down"], []string{"3", "4"}) {
+		t.Log(iface.options["pre-down"])
+		t.FailNow()
+	}
+}
+
+func TestParseInterfaceStanzaEmptyOption(t *testing.T) {
+	options := []string{
+		"test",
+	}
+	iface, err := parseInterfaceStanza([]string{"eth", "inet", "manual"}, options)
+	if err != nil {
+		t.FailNow()
+	}
+	if !reflect.DeepEqual(iface.options["test"], []string{}) {
+		t.FailNow()
+	}
+}
+
+func TestParseInterfaceStanzaOptions(t *testing.T) {
+	options := []string{
+		"test1 1",
+		"test2 2 3",
+		"test1 5 6",
+	}
+	iface, err := parseInterfaceStanza([]string{"eth", "inet", "manual"}, options)
+	if err != nil {
+		t.FailNow()
+	}
+	if !reflect.DeepEqual(iface.options["test1"], []string{"5", "6"}) {
+		t.Log(iface.options["test1"])
+		t.FailNow()
+	}
+	if !reflect.DeepEqual(iface.options["test2"], []string{"2", "3"}) {
+		t.Log(iface.options["test2"])
+		t.FailNow()
+	}
+}
+
+func TestParseInterfaceStazaBond(t *testing.T) {
+	iface, err := parseInterfaceStanza([]string{"mybond", "inet", "manual"}, []string{"bond-slaves eth"})
+	if err != nil {
+		t.FailNow()
+	}
+	if iface.kind != interfaceBond {
+		t.FailNow()
+	}
+}
+
+func TestParseInterfaceStazaVLANName(t *testing.T) {
+	iface, err := parseInterfaceStanza([]string{"eth0.1", "inet", "manual"}, nil)
+	if err != nil {
+		t.FailNow()
+	}
+	if iface.kind != interfaceVLAN {
+		t.FailNow()
+	}
+}
+
+func TestParseInterfaceStazaVLANOption(t *testing.T) {
+	iface, err := parseInterfaceStanza([]string{"vlan1", "inet", "manual"}, []string{"vlan_raw_device eth"})
+	if err != nil {
+		t.FailNow()
+	}
+	if iface.kind != interfaceVLAN {
+		t.FailNow()
+	}
+}
+
+func TestParseStanzasNone(t *testing.T) {
+	stanzas, err := parseStanzas(nil)
+	if err != nil {
+		t.FailNow()
+	}
+	if len(stanzas) != 0 {
+		t.FailNow()
+	}
+}
+
+func TestParseStanzas(t *testing.T) {
+	lines := []string{
+		"auto lo",
+		"iface lo inet loopback",
+		"iface eth1 inet manual",
+		"iface eth2 inet manual",
+		"iface eth3 inet manual",
+		"auto eth1 eth3",
+	}
+	expect := []stanza{
+		&stanzaAuto{
+			interfaces: []string{"lo"},
+		},
+		&stanzaInterface{
+			name:         "lo",
+			kind:         interfacePhysical,
+			auto:         true,
+			configMethod: configMethodLoopback{},
+			options:      map[string][]string{},
+		},
+		&stanzaInterface{
+			name:         "eth1",
+			kind:         interfacePhysical,
+			auto:         true,
+			configMethod: configMethodManual{},
+			options:      map[string][]string{},
+		},
+		&stanzaInterface{
+			name:         "eth2",
+			kind:         interfacePhysical,
+			auto:         false,
+			configMethod: configMethodManual{},
+			options:      map[string][]string{},
+		},
+		&stanzaInterface{
+			name:         "eth3",
+			kind:         interfacePhysical,
+			auto:         true,
+			configMethod: configMethodManual{},
+			options:      map[string][]string{},
+		},
+		&stanzaAuto{
+			interfaces: []string{"eth1", "eth3"},
+		},
+	}
+	stanzas, err := parseStanzas(lines)
+	if err != err {
+		t.FailNow()
+	}
+	if !reflect.DeepEqual(stanzas, expect) {
+		t.FailNow()
+	}
+}

system/networkd.go

@@ -0,0 +1,89 @@
+package system
+
+import (
+	"fmt"
+	"io/ioutil"
+	"net"
+	"os/exec"
+	"path"
+
+	"github.com/coreos/coreos-cloudinit/network"
+	"github.com/coreos/coreos-cloudinit/third_party/github.com/dotcloud/docker/pkg/netlink"
+)
+
+const (
+	runtimeNetworkPath = "/run/systemd/network"
+)
+
+func RestartNetwork(interfaces []network.InterfaceGenerator) (err error) {
+	defer func() {
+		if e := restartNetworkd(); e != nil {
+			err = e
+		}
+	}()
+
+	if err = downNetworkInterfaces(interfaces); err != nil {
+		return
+	}
+
+	if err = probe8012q(); err != nil {
+		return
+	}
+	return
+}
+
+func downNetworkInterfaces(interfaces []network.InterfaceGenerator) error {
+	sysInterfaceMap := make(map[string]*net.Interface)
+	if systemInterfaces, err := net.Interfaces(); err == nil {
+		for _, iface := range systemInterfaces {
+			sysInterfaceMap[iface.Name] = &iface
+		}
+	} else {
+		return err
+	}
+
+	for _, iface := range interfaces {
+		if systemInterface, ok := sysInterfaceMap[iface.Name()]; ok {
+			if err := netlink.NetworkLinkDown(systemInterface); err != nil {
+				fmt.Printf("Error while downing interface %q (%s). Continuing...\n", systemInterface.Name, err)
+			}
+		}
+	}
+
+	return nil
+}
+
+func probe8012q() error {
+	return exec.Command("modprobe", "8021q").Run()
+}
+
+func restartNetworkd() error {
+	_, err := RunUnitCommand("restart", "systemd-networkd.service")
+	return err
+}
+
+func WriteNetworkdConfigs(interfaces []network.InterfaceGenerator) error {
+	for _, iface := range interfaces {
+		filename := path.Join(runtimeNetworkPath, fmt.Sprintf("%s.netdev", iface.Name()))
+		if err := writeConfig(filename, iface.Netdev()); err != nil {
+			return err
+		}
+		filename = path.Join(runtimeNetworkPath, fmt.Sprintf("%s.link", iface.Name()))
+		if err := writeConfig(filename, iface.Link()); err != nil {
+			return err
+		}
+		filename = path.Join(runtimeNetworkPath, fmt.Sprintf("%s.network", iface.Name()))
+		if err := writeConfig(filename, iface.Network()); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func writeConfig(filename string, config string) error {
+	if config == "" {
+		return nil
+	}
+
+	return ioutil.WriteFile(filename, []byte(config), 0444)
+}

test

@@ -13,7 +13,7 @@ COVER=${COVER:-"-cover"}
 
 source ./build
 
-declare -a TESTPKGS=(initialize system datasource pkg)
+declare -a TESTPKGS=(initialize system datasource pkg network)
 
 if [ -z "$PKG" ]; then
 	GOFMTPATH="$TESTPKGS coreos-cloudinit.go"

third_party/github.com/dotcloud/docker/pkg/netlink/MAINTAINERS

@@ -0,0 +1,2 @@
+Michael Crosby <michael@crosbymichael.com> (@crosbymichael)
+Guillaume J. Charmes <guillaume@docker.com> (@creack)

third_party/github.com/dotcloud/docker/pkg/netlink/netlink.go

@@ -0,0 +1,23 @@
+// Packet netlink provide access to low level Netlink sockets and messages.
+//
+// Actual implementations are in:
+// netlink_linux.go
+// netlink_darwin.go
+package netlink
+
+import (
+	"errors"
+	"net"
+)
+
+var (
+	ErrWrongSockType = errors.New("Wrong socket type")
+	ErrShortResponse = errors.New("Got short response from netlink")
+)
+
+// A Route is a subnet associated with the interface to reach it.
+type Route struct {
+	*net.IPNet
+	Iface   *net.Interface
+	Default bool
+}

third_party/github.com/dotcloud/docker/pkg/netlink/netlink_linux.go

@@ -0,0 +1,891 @@
+// +build amd64
+
+package netlink
+
+import (
+	"encoding/binary"
+	"fmt"
+	"math/rand"
+	"net"
+	"syscall"
+	"unsafe"
+)
+
+const (
+	IFNAMSIZ       = 16
+	DEFAULT_CHANGE = 0xFFFFFFFF
+	IFLA_INFO_KIND = 1
+	IFLA_INFO_DATA = 2
+	VETH_INFO_PEER = 1
+	IFLA_NET_NS_FD = 28
+	SIOC_BRADDBR   = 0x89a0
+	SIOC_BRADDIF   = 0x89a2
+)
+
+var nextSeqNr int
+
+type ifreqHwaddr struct {
+	IfrnName   [16]byte
+	IfruHwaddr syscall.RawSockaddr
+}
+
+type ifreqIndex struct {
+	IfrnName  [16]byte
+	IfruIndex int32
+}
+
+func nativeEndian() binary.ByteOrder {
+	var x uint32 = 0x01020304
+	if *(*byte)(unsafe.Pointer(&x)) == 0x01 {
+		return binary.BigEndian
+	}
+	return binary.LittleEndian
+}
+
+func getSeq() int {
+	nextSeqNr = nextSeqNr + 1
+	return nextSeqNr
+}
+
+func getIpFamily(ip net.IP) int {
+	if len(ip) <= net.IPv4len {
+		return syscall.AF_INET
+	}
+	if ip.To4() != nil {
+		return syscall.AF_INET
+	}
+	return syscall.AF_INET6
+}
+
+type NetlinkRequestData interface {
+	Len() int
+	ToWireFormat() []byte
+}
+
+type IfInfomsg struct {
+	syscall.IfInfomsg
+}
+
+func newIfInfomsg(family int) *IfInfomsg {
+	return &IfInfomsg{
+		IfInfomsg: syscall.IfInfomsg{
+			Family: uint8(family),
+		},
+	}
+}
+
+func newIfInfomsgChild(parent *RtAttr, family int) *IfInfomsg {
+	msg := newIfInfomsg(family)
+	parent.children = append(parent.children, msg)
+	return msg
+}
+
+func (msg *IfInfomsg) ToWireFormat() []byte {
+	native := nativeEndian()
+
+	length := syscall.SizeofIfInfomsg
+	b := make([]byte, length)
+	b[0] = msg.Family
+	b[1] = 0
+	native.PutUint16(b[2:4], msg.Type)
+	native.PutUint32(b[4:8], uint32(msg.Index))
+	native.PutUint32(b[8:12], msg.Flags)
+	native.PutUint32(b[12:16], msg.Change)
+	return b
+}
+
+func (msg *IfInfomsg) Len() int {
+	return syscall.SizeofIfInfomsg
+}
+
+type IfAddrmsg struct {
+	syscall.IfAddrmsg
+}
+
+func newIfAddrmsg(family int) *IfAddrmsg {
+	return &IfAddrmsg{
+		IfAddrmsg: syscall.IfAddrmsg{
+			Family: uint8(family),
+		},
+	}
+}
+
+func (msg *IfAddrmsg) ToWireFormat() []byte {
+	native := nativeEndian()
+
+	length := syscall.SizeofIfAddrmsg
+	b := make([]byte, length)
+	b[0] = msg.Family
+	b[1] = msg.Prefixlen
+	b[2] = msg.Flags
+	b[3] = msg.Scope
+	native.PutUint32(b[4:8], msg.Index)
+	return b
+}
+
+func (msg *IfAddrmsg) Len() int {
+	return syscall.SizeofIfAddrmsg
+}
+
+type RtMsg struct {
+	syscall.RtMsg
+}
+
+func newRtMsg(family int) *RtMsg {
+	return &RtMsg{
+		RtMsg: syscall.RtMsg{
+			Family:   uint8(family),
+			Table:    syscall.RT_TABLE_MAIN,
+			Scope:    syscall.RT_SCOPE_UNIVERSE,
+			Protocol: syscall.RTPROT_BOOT,
+			Type:     syscall.RTN_UNICAST,
+		},
+	}
+}
+
+func (msg *RtMsg) ToWireFormat() []byte {
+	native := nativeEndian()
+
+	length := syscall.SizeofRtMsg
+	b := make([]byte, length)
+	b[0] = msg.Family
+	b[1] = msg.Dst_len
+	b[2] = msg.Src_len
+	b[3] = msg.Tos
+	b[4] = msg.Table
+	b[5] = msg.Protocol
+	b[6] = msg.Scope
+	b[7] = msg.Type
+	native.PutUint32(b[8:12], msg.Flags)
+	return b
+}
+
+func (msg *RtMsg) Len() int {
+	return syscall.SizeofRtMsg
+}
+
+func rtaAlignOf(attrlen int) int {
+	return (attrlen + syscall.RTA_ALIGNTO - 1) & ^(syscall.RTA_ALIGNTO - 1)
+}
+
+type RtAttr struct {
+	syscall.RtAttr
+	Data     []byte
+	children []NetlinkRequestData
+}
+
+func newRtAttr(attrType int, data []byte) *RtAttr {
+	return &RtAttr{
+		RtAttr: syscall.RtAttr{
+			Type: uint16(attrType),
+		},
+		children: []NetlinkRequestData{},
+		Data:     data,
+	}
+}
+
+func newRtAttrChild(parent *RtAttr, attrType int, data []byte) *RtAttr {
+	attr := newRtAttr(attrType, data)
+	parent.children = append(parent.children, attr)
+	return attr
+}
+
+func (a *RtAttr) Len() int {
+	l := 0
+	for _, child := range a.children {
+		l += child.Len() + syscall.SizeofRtAttr
+	}
+	if l == 0 {
+		l++
+	}
+	return rtaAlignOf(l + len(a.Data))
+}
+
+func (a *RtAttr) ToWireFormat() []byte {
+	native := nativeEndian()
+
+	length := a.Len()
+	buf := make([]byte, rtaAlignOf(length+syscall.SizeofRtAttr))
+
+	if a.Data != nil {
+		copy(buf[4:], a.Data)
+	} else {
+		next := 4
+		for _, child := range a.children {
+			childBuf := child.ToWireFormat()
+			copy(buf[next:], childBuf)
+			next += rtaAlignOf(len(childBuf))
+		}
+	}
+
+	if l := uint16(rtaAlignOf(length)); l != 0 {
+		native.PutUint16(buf[0:2], l+1)
+	}
+	native.PutUint16(buf[2:4], a.Type)
+
+	return buf
+}
+
+type NetlinkRequest struct {
+	syscall.NlMsghdr
+	Data []NetlinkRequestData
+}
+
+func (rr *NetlinkRequest) ToWireFormat() []byte {
+	native := nativeEndian()
+
+	length := rr.Len
+	dataBytes := make([][]byte, len(rr.Data))
+	for i, data := range rr.Data {
+		dataBytes[i] = data.ToWireFormat()
+		length += uint32(len(dataBytes[i]))
+	}
+	b := make([]byte, length)
+	native.PutUint32(b[0:4], length)
+	native.PutUint16(b[4:6], rr.Type)
+	native.PutUint16(b[6:8], rr.Flags)
+	native.PutUint32(b[8:12], rr.Seq)
+	native.PutUint32(b[12:16], rr.Pid)
+
+	next := 16
+	for _, data := range dataBytes {
+		copy(b[next:], data)
+		next += len(data)
+	}
+	return b
+}
+
+func (rr *NetlinkRequest) AddData(data NetlinkRequestData) {
+	if data != nil {
+		rr.Data = append(rr.Data, data)
+	}
+}
+
+func newNetlinkRequest(proto, flags int) *NetlinkRequest {
+	return &NetlinkRequest{
+		NlMsghdr: syscall.NlMsghdr{
+			Len:   uint32(syscall.NLMSG_HDRLEN),
+			Type:  uint16(proto),
+			Flags: syscall.NLM_F_REQUEST | uint16(flags),
+			Seq:   uint32(getSeq()),
+		},
+	}
+}
+
+type NetlinkSocket struct {
+	fd  int
+	lsa syscall.SockaddrNetlink
+}
+
+func getNetlinkSocket() (*NetlinkSocket, error) {
+	fd, err := syscall.Socket(syscall.AF_NETLINK, syscall.SOCK_RAW, syscall.NETLINK_ROUTE)
+	if err != nil {
+		return nil, err
+	}
+	s := &NetlinkSocket{
+		fd: fd,
+	}
+	s.lsa.Family = syscall.AF_NETLINK
+	if err := syscall.Bind(fd, &s.lsa); err != nil {
+		syscall.Close(fd)
+		return nil, err
+	}
+
+	return s, nil
+}
+
+func (s *NetlinkSocket) Close() {
+	syscall.Close(s.fd)
+}
+
+func (s *NetlinkSocket) Send(request *NetlinkRequest) error {
+	if err := syscall.Sendto(s.fd, request.ToWireFormat(), 0, &s.lsa); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (s *NetlinkSocket) Receive() ([]syscall.NetlinkMessage, error) {
+	rb := make([]byte, syscall.Getpagesize())
+	nr, _, err := syscall.Recvfrom(s.fd, rb, 0)
+	if err != nil {
+		return nil, err
+	}
+	if nr < syscall.NLMSG_HDRLEN {
+		return nil, ErrShortResponse
+	}
+	rb = rb[:nr]
+	return syscall.ParseNetlinkMessage(rb)
+}
+
+func (s *NetlinkSocket) GetPid() (uint32, error) {
+	lsa, err := syscall.Getsockname(s.fd)
+	if err != nil {
+		return 0, err
+	}
+	switch v := lsa.(type) {
+	case *syscall.SockaddrNetlink:
+		return v.Pid, nil
+	}
+	return 0, ErrWrongSockType
+}
+
+func (s *NetlinkSocket) HandleAck(seq uint32) error {
+	native := nativeEndian()
+
+	pid, err := s.GetPid()
+	if err != nil {
+		return err
+	}
+
+done:
+	for {
+		msgs, err := s.Receive()
+		if err != nil {
+			return err
+		}
+		for _, m := range msgs {
+			if m.Header.Seq != seq {
+				return fmt.Errorf("Wrong Seq nr %d, expected %d", m.Header.Seq, seq)
+			}
+			if m.Header.Pid != pid {
+				return fmt.Errorf("Wrong pid %d, expected %d", m.Header.Pid, pid)
+			}
+			if m.Header.Type == syscall.NLMSG_DONE {
+				break done
+			}
+			if m.Header.Type == syscall.NLMSG_ERROR {
+				error := int32(native.Uint32(m.Data[0:4]))
+				if error == 0 {
+					break done
+				}
+				return syscall.Errno(-error)
+			}
+		}
+	}
+
+	return nil
+}
+
+// Add a new default gateway. Identical to:
+// ip route add default via $ip
+func AddDefaultGw(ip net.IP) error {
+	s, err := getNetlinkSocket()
+	if err != nil {
+		return err
+	}
+	defer s.Close()
+
+	family := getIpFamily(ip)
+
+	wb := newNetlinkRequest(syscall.RTM_NEWROUTE, syscall.NLM_F_CREATE|syscall.NLM_F_EXCL|syscall.NLM_F_ACK)
+
+	msg := newRtMsg(family)
+	wb.AddData(msg)
+
+	var ipData []byte
+	if family == syscall.AF_INET {
+		ipData = ip.To4()
+	} else {
+		ipData = ip.To16()
+	}
+
+	gateway := newRtAttr(syscall.RTA_GATEWAY, ipData)
+
+	wb.AddData(gateway)
+
+	if err := s.Send(wb); err != nil {
+		return err
+	}
+
+	return s.HandleAck(wb.Seq)
+}
+
+// Bring up a particular network interface
+func NetworkLinkUp(iface *net.Interface) error {
+	s, err := getNetlinkSocket()
+	if err != nil {
+		return err
+	}
+	defer s.Close()
+
+	wb := newNetlinkRequest(syscall.RTM_NEWLINK, syscall.NLM_F_ACK)
+
+	msg := newIfInfomsg(syscall.AF_UNSPEC)
+	msg.Change = syscall.IFF_UP
+	msg.Flags = syscall.IFF_UP
+	msg.Index = int32(iface.Index)
+	wb.AddData(msg)
+
+	if err := s.Send(wb); err != nil {
+		return err
+	}
+
+	return s.HandleAck(wb.Seq)
+}
+
+func NetworkLinkDown(iface *net.Interface) error {
+	s, err := getNetlinkSocket()
+	if err != nil {
+		return err
+	}
+	defer s.Close()
+
+	wb := newNetlinkRequest(syscall.RTM_NEWLINK, syscall.NLM_F_ACK)
+
+	msg := newIfInfomsg(syscall.AF_UNSPEC)
+	msg.Change = syscall.IFF_UP
+	msg.Flags = 0 & ^syscall.IFF_UP
+	msg.Index = int32(iface.Index)
+	wb.AddData(msg)
+
+	if err := s.Send(wb); err != nil {
+		return err
+	}
+
+	return s.HandleAck(wb.Seq)
+}
+
+func NetworkSetMTU(iface *net.Interface, mtu int) 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 = DEFAULT_CHANGE
+	wb.AddData(msg)
+
+	var (
+		b      = make([]byte, 4)
+		native = nativeEndian()
+	)
+	native.PutUint32(b, uint32(mtu))
+
+	data := newRtAttr(syscall.IFLA_MTU, b)
+	wb.AddData(data)
+
+	if err := s.Send(wb); err != nil {
+		return err
+	}
+	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 = DEFAULT_CHANGE
+	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)
+}
+
+func NetworkSetNsPid(iface *net.Interface, nspid int) 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 = DEFAULT_CHANGE
+	wb.AddData(msg)
+
+	var (
+		b      = make([]byte, 4)
+		native = nativeEndian()
+	)
+	native.PutUint32(b, uint32(nspid))
+
+	data := newRtAttr(syscall.IFLA_NET_NS_PID, b)
+	wb.AddData(data)
+
+	if err := s.Send(wb); err != nil {
+		return err
+	}
+
+	return s.HandleAck(wb.Seq)
+}
+
+func NetworkSetNsFd(iface *net.Interface, fd int) 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 = DEFAULT_CHANGE
+	wb.AddData(msg)
+
+	var (
+		b      = make([]byte, 4)
+		native = nativeEndian()
+	)
+	native.PutUint32(b, uint32(fd))
+
+	data := newRtAttr(IFLA_NET_NS_FD, 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 {
+	s, err := getNetlinkSocket()
+	if err != nil {
+		return err
+	}
+	defer s.Close()
+
+	family := getIpFamily(ip)
+
+	wb := newNetlinkRequest(syscall.RTM_NEWADDR, syscall.NLM_F_CREATE|syscall.NLM_F_EXCL|syscall.NLM_F_ACK)
+
+	msg := newIfAddrmsg(family)
+	msg.Index = uint32(iface.Index)
+	prefixLen, _ := ipNet.Mask.Size()
+	msg.Prefixlen = uint8(prefixLen)
+	wb.AddData(msg)
+
+	var ipData []byte
+	if family == syscall.AF_INET {
+		ipData = ip.To4()
+	} else {
+		ipData = ip.To16()
+	}
+
+	localData := newRtAttr(syscall.IFA_LOCAL, ipData)
+	wb.AddData(localData)
+
+	addrData := newRtAttr(syscall.IFA_ADDRESS, ipData)
+	wb.AddData(addrData)
+
+	if err := s.Send(wb); err != nil {
+		return err
+	}
+
+	return s.HandleAck(wb.Seq)
+}
+
+func zeroTerminated(s string) []byte {
+	return []byte(s + "\000")
+}
+
+func nonZeroTerminated(s string) []byte {
+	return []byte(s)
+}
+
+// Add a new network link of a specified type. This is identical to
+// running: ip add link $name type $linkType
+func NetworkLinkAdd(name string, linkType string) error {
+	s, err := getNetlinkSocket()
+	if err != nil {
+		return err
+	}
+	defer s.Close()
+
+	wb := newNetlinkRequest(syscall.RTM_NEWLINK, syscall.NLM_F_CREATE|syscall.NLM_F_EXCL|syscall.NLM_F_ACK)
+
+	msg := newIfInfomsg(syscall.AF_UNSPEC)
+	wb.AddData(msg)
+
+	if name != "" {
+		nameData := newRtAttr(syscall.IFLA_IFNAME, zeroTerminated(name))
+		wb.AddData(nameData)
+	}
+
+	kindData := newRtAttr(IFLA_INFO_KIND, nonZeroTerminated(linkType))
+
+	infoData := newRtAttr(syscall.IFLA_LINKINFO, kindData.ToWireFormat())
+	wb.AddData(infoData)
+
+	if err := s.Send(wb); err != nil {
+		return err
+	}
+
+	return s.HandleAck(wb.Seq)
+}
+
+// Returns an array of IPNet for all the currently routed subnets on ipv4
+// This is similar to the first column of "ip route" output
+func NetworkGetRoutes() ([]Route, error) {
+	native := nativeEndian()
+
+	s, err := getNetlinkSocket()
+	if err != nil {
+		return nil, err
+	}
+	defer s.Close()
+
+	wb := newNetlinkRequest(syscall.RTM_GETROUTE, syscall.NLM_F_DUMP)
+
+	msg := newIfInfomsg(syscall.AF_UNSPEC)
+	wb.AddData(msg)
+
+	if err := s.Send(wb); err != nil {
+		return nil, err
+	}
+
+	pid, err := s.GetPid()
+	if err != nil {
+		return nil, err
+	}
+
+	res := make([]Route, 0)
+
+done:
+	for {
+		msgs, err := s.Receive()
+		if err != nil {
+			return nil, err
+		}
+		for _, m := range msgs {
+			if m.Header.Seq != wb.Seq {
+				return nil, fmt.Errorf("Wrong Seq nr %d, expected 1", m.Header.Seq)
+			}
+			if m.Header.Pid != pid {
+				return nil, fmt.Errorf("Wrong pid %d, expected %d", m.Header.Pid, pid)
+			}
+			if m.Header.Type == syscall.NLMSG_DONE {
+				break done
+			}
+			if m.Header.Type == syscall.NLMSG_ERROR {
+				error := int32(native.Uint32(m.Data[0:4]))
+				if error == 0 {
+					break done
+				}
+				return nil, syscall.Errno(-error)
+			}
+			if m.Header.Type != syscall.RTM_NEWROUTE {
+				continue
+			}
+
+			var r Route
+
+			msg := (*RtMsg)(unsafe.Pointer(&m.Data[0:syscall.SizeofRtMsg][0]))
+
+			if msg.Flags&syscall.RTM_F_CLONED != 0 {
+				// Ignore cloned routes
+				continue
+			}
+
+			if msg.Table != syscall.RT_TABLE_MAIN {
+				// Ignore non-main tables
+				continue
+			}
+
+			if msg.Family != syscall.AF_INET {
+				// Ignore non-ipv4 routes
+				continue
+			}
+
+			if msg.Dst_len == 0 {
+				// Default routes
+				r.Default = true
+			}
+
+			attrs, err := syscall.ParseNetlinkRouteAttr(&m)
+			if err != nil {
+				return nil, err
+			}
+			for _, attr := range attrs {
+				switch attr.Attr.Type {
+				case syscall.RTA_DST:
+					ip := attr.Value
+					r.IPNet = &net.IPNet{
+						IP:   ip,
+						Mask: net.CIDRMask(int(msg.Dst_len), 8*len(ip)),
+					}
+				case syscall.RTA_OIF:
+					index := int(native.Uint32(attr.Value[0:4]))
+					r.Iface, _ = net.InterfaceByIndex(index)
+				}
+			}
+			if r.Default || r.IPNet != nil {
+				res = append(res, r)
+			}
+		}
+	}
+
+	return res, nil
+}
+
+func getIfSocket() (fd int, err error) {
+	for _, socket := range []int{
+		syscall.AF_INET,
+		syscall.AF_PACKET,
+		syscall.AF_INET6,
+	} {
+		if fd, err = syscall.Socket(socket, syscall.SOCK_DGRAM, 0); err == nil {
+			break
+		}
+	}
+	if err == nil {
+		return fd, nil
+	}
+	return -1, err
+}
+
+func NetworkChangeName(iface *net.Interface, newName string) error {
+	fd, err := getIfSocket()
+	if err != nil {
+		return err
+	}
+	defer syscall.Close(fd)
+
+	data := [IFNAMSIZ * 2]byte{}
+	// the "-1"s here are very important for ensuring we get proper null
+	// termination of our new C strings
+	copy(data[:IFNAMSIZ-1], iface.Name)
+	copy(data[IFNAMSIZ:IFNAMSIZ*2-1], newName)
+
+	if _, _, errno := syscall.Syscall(syscall.SYS_IOCTL, uintptr(fd), syscall.SIOCSIFNAME, uintptr(unsafe.Pointer(&data[0]))); errno != 0 {
+		return errno
+	}
+	return nil
+}
+
+func NetworkCreateVethPair(name1, name2 string) error {
+	s, err := getNetlinkSocket()
+	if err != nil {
+		return err
+	}
+	defer s.Close()
+
+	wb := newNetlinkRequest(syscall.RTM_NEWLINK, syscall.NLM_F_CREATE|syscall.NLM_F_EXCL|syscall.NLM_F_ACK)
+
+	msg := newIfInfomsg(syscall.AF_UNSPEC)
+	wb.AddData(msg)
+
+	nameData := newRtAttr(syscall.IFLA_IFNAME, zeroTerminated(name1))
+	wb.AddData(nameData)
+
+	nest1 := newRtAttr(syscall.IFLA_LINKINFO, nil)
+	newRtAttrChild(nest1, IFLA_INFO_KIND, zeroTerminated("veth"))
+	nest2 := newRtAttrChild(nest1, IFLA_INFO_DATA, nil)
+	nest3 := newRtAttrChild(nest2, VETH_INFO_PEER, nil)
+
+	newIfInfomsgChild(nest3, syscall.AF_UNSPEC)
+	newRtAttrChild(nest3, syscall.IFLA_IFNAME, zeroTerminated(name2))
+
+	wb.AddData(nest1)
+
+	if err := s.Send(wb); err != nil {
+		return err
+	}
+	return s.HandleAck(wb.Seq)
+}
+
+// Create the actual bridge device.  This is more backward-compatible than
+// netlink.NetworkLinkAdd and works on RHEL 6.
+func CreateBridge(name string, setMacAddr bool) error {
+	s, err := syscall.Socket(syscall.AF_INET6, syscall.SOCK_STREAM, syscall.IPPROTO_IP)
+	if err != nil {
+		// ipv6 issue, creating with ipv4
+		s, err = syscall.Socket(syscall.AF_INET, syscall.SOCK_STREAM, syscall.IPPROTO_IP)
+		if err != nil {
+			return err
+		}
+	}
+	defer syscall.Close(s)
+
+	nameBytePtr, err := syscall.BytePtrFromString(name)
+	if err != nil {
+		return err
+	}
+	if _, _, err := syscall.Syscall(syscall.SYS_IOCTL, uintptr(s), SIOC_BRADDBR, uintptr(unsafe.Pointer(nameBytePtr))); err != 0 {
+		return err
+	}
+	if setMacAddr {
+		return setBridgeMacAddress(s, name)
+	}
+	return nil
+}
+
+// Add a slave to abridge device.  This is more backward-compatible than
+// netlink.NetworkSetMaster and works on RHEL 6.
+func AddToBridge(iface, master *net.Interface) error {
+	s, err := syscall.Socket(syscall.AF_INET6, syscall.SOCK_STREAM, syscall.IPPROTO_IP)
+	if err != nil {
+		// ipv6 issue, creating with ipv4
+		s, err = syscall.Socket(syscall.AF_INET, syscall.SOCK_STREAM, syscall.IPPROTO_IP)
+		if err != nil {
+			return err
+		}
+	}
+	defer syscall.Close(s)
+
+	ifr := ifreqIndex{}
+	copy(ifr.IfrnName[:], master.Name)
+	ifr.IfruIndex = int32(iface.Index)
+
+	if _, _, err := syscall.Syscall(syscall.SYS_IOCTL, uintptr(s), SIOC_BRADDIF, uintptr(unsafe.Pointer(&ifr))); err != 0 {
+		return err
+	}
+
+	return nil
+}
+
+func setBridgeMacAddress(s int, name string) error {
+	ifr := ifreqHwaddr{}
+	ifr.IfruHwaddr.Family = syscall.ARPHRD_ETHER
+	copy(ifr.IfrnName[:], name)
+
+	for i := 0; i < 6; i++ {
+		ifr.IfruHwaddr.Data[i] = int8(rand.Intn(255))
+	}
+
+	ifr.IfruHwaddr.Data[0] &^= 0x1 // clear multicast bit
+	ifr.IfruHwaddr.Data[0] |= 0x2  // set local assignment bit (IEEE802)
+
+	if _, _, err := syscall.Syscall(syscall.SYS_IOCTL, uintptr(s), syscall.SIOCSIFHWADDR, uintptr(unsafe.Pointer(&ifr))); err != 0 {
+		return err
+	}
+	return nil
+}

third_party/github.com/dotcloud/docker/pkg/netlink/netlink_unsupported.go

@@ -0,0 +1,69 @@
+// +build !linux !amd64
+
+package netlink
+
+import (
+	"errors"
+	"net"
+)
+
+var (
+	ErrNotImplemented = errors.New("not implemented")
+)
+
+func NetworkGetRoutes() ([]Route, error) {
+	return nil, ErrNotImplemented
+}
+
+func NetworkLinkAdd(name string, linkType string) error {
+	return ErrNotImplemented
+}
+
+func NetworkLinkUp(iface *net.Interface) error {
+	return ErrNotImplemented
+}
+
+func NetworkLinkAddIp(iface *net.Interface, ip net.IP, ipNet *net.IPNet) error {
+	return ErrNotImplemented
+}
+
+func AddDefaultGw(ip net.IP) error {
+	return ErrNotImplemented
+
+}
+
+func NetworkSetMTU(iface *net.Interface, mtu int) error {
+	return ErrNotImplemented
+}
+
+func NetworkCreateVethPair(name1, name2 string) error {
+	return ErrNotImplemented
+}
+
+func NetworkChangeName(iface *net.Interface, newName string) error {
+	return ErrNotImplemented
+}
+
+func NetworkSetNsFd(iface *net.Interface, fd int) error {
+	return ErrNotImplemented
+}
+
+func NetworkSetNsPid(iface *net.Interface, nspid int) error {
+	return ErrNotImplemented
+}
+
+func NetworkSetMaster(iface, master *net.Interface) error {
+	return ErrNotImplemented
+}
+
+func NetworkLinkDown(iface *net.Interface) error {
+	return ErrNotImplemented
+}
+
+func CreateBridge(name string, setMacAddr bool) error {
+	return ErrNotImplemented
+}
+
+func AddToBridge(iface, master *net.Interface) error {
+	return ErrNotImplemented
+}

units/user-config.target

@@ -4,8 +4,8 @@ Requires=system-config.target
 After=system-config.target
 
 # Watch for configs at a couple common paths
-Requires=user-cloudinit@media-configdrive-openstack-latest-user_data.path
-After=user-cloudinit@media-configdrive-openstack-latest-user_data.path
+Requires=user-configdrive.path
+After=user-configdrive.path
 Requires=user-cloudinit@var-lib-coreos\x2dinstall-user_data.path
 After=user-cloudinit@var-lib-coreos\x2dinstall-user_data.path
 

units/user-configdrive.path

@@ -0,0 +1,5 @@
+[Unit]
+Description=Watch for a cloud-config at /media/configdrive
+
+[Path]
+DirectoryNotEmpty=/media/configdrive

units/user-configdrive.service

@@ -1,9 +1,8 @@
 [Unit]
-Description=Load cloud-config from %f
+Description=Load cloud-config from /media/configdrive
 Requires=coreos-setup-environment.service
 After=coreos-setup-environment.service
 Before=user-config.target
-ConditionFileNotEmpty=%f
 
 # HACK: work around ordering between config drive and ec2 metadata It is
 # possible for OpenStack style systems to provide both the metadata service
@@ -21,4 +20,4 @@ After=ec2-cloudinit.service
 Type=oneshot
 RemainAfterExit=yes
 EnvironmentFile=-/etc/environment
-ExecStart=/usr/bin/coreos-cloudinit --from-file=%f
+ExecStart=/usr/bin/coreos-cloudinit --from-configdrive=/media/configdrive