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package hst
import (
"errors"
"fmt"
"os/exec"
"strings"
"go.fd.io/govpp/binapi/ethernet_types"
"go.fd.io/govpp/binapi/interface_types"
"go.fd.io/govpp/binapi/ip_types"
)
type (
Cmd = exec.Cmd
MacAddress = ethernet_types.MacAddress
AddressWithPrefix = ip_types.AddressWithPrefix
IP4AddressWithPrefix = ip_types.IP4AddressWithPrefix
InterfaceIndex = interface_types.InterfaceIndex
NetConfig interface {
configure() error
unconfigure()
Name() string
Type() string
}
NetConfigBase struct {
name string
category string // what else to call this when `type` is reserved?
}
NetInterface struct {
NetConfigBase
Ip4AddrAllocator *Ip4AddressAllocator
Ip4Address string
Index InterfaceIndex
HwAddress MacAddress
NetworkNamespace string
NetworkNumber int
Peer *NetInterface
}
NetworkNamespace struct {
NetConfigBase
}
NetworkBridge struct {
NetConfigBase
NetworkNamespace string
Interfaces []string
}
)
const (
NetNs string = "netns"
Veth string = "veth"
Tap string = "tap"
Bridge string = "bridge"
)
type InterfaceAdder func(n *NetInterface) *Cmd
var (
ipCommandMap = map[string]InterfaceAdder{
Veth: func(n *NetInterface) *Cmd {
return exec.Command("ip", "link", "add", n.name, "type", "veth", "peer", "name", n.Peer.name)
},
Tap: func(n *NetInterface) *Cmd {
return exec.Command("ip", "tuntap", "add", n.name, "mode", "tap")
},
}
)
func newNetworkInterface(cfg NetDevConfig, a *Ip4AddressAllocator) (*NetInterface, error) {
var newInterface *NetInterface = &NetInterface{}
var err error
newInterface.Ip4AddrAllocator = a
newInterface.name = cfg["name"].(string)
newInterface.NetworkNumber = DEFAULT_NETWORK_NUM
if interfaceType, ok := cfg["type"]; ok {
newInterface.category = interfaceType.(string)
}
if presetHwAddress, ok := cfg["preset-hw-address"]; ok {
newInterface.HwAddress, err = ethernet_types.ParseMacAddress(presetHwAddress.(string))
if err != nil {
return &NetInterface{}, err
}
}
if netns, ok := cfg["netns"]; ok {
newInterface.NetworkNamespace = netns.(string)
}
if ip, ok := cfg["ip4"]; ok {
if n, ok := ip.(NetDevConfig)["network"]; ok {
newInterface.NetworkNumber = n.(int)
}
newInterface.Ip4Address, err = newInterface.Ip4AddrAllocator.NewIp4InterfaceAddress(
newInterface.NetworkNumber,
)
if err != nil {
return &NetInterface{}, err
}
}
if _, ok := cfg["peer"]; !ok {
return newInterface, nil
}
peer := cfg["peer"].(NetDevConfig)
if newInterface.Peer, err = newNetworkInterface(peer, a); err != nil {
return &NetInterface{}, err
}
return newInterface, nil
}
func (n *NetInterface) configureUpState() error {
err := setDevUp(n.Name(), "")
if err != nil {
return fmt.Errorf("set link up failed: %v", err)
}
return nil
}
func (n *NetInterface) configureNetworkNamespace() error {
if n.NetworkNamespace != "" {
err := linkSetNetns(n.name, n.NetworkNamespace)
if err != nil {
return err
}
}
return nil
}
func (n *NetInterface) configureAddress() error {
if n.Ip4Address != "" {
if err := addAddress(
n.Name(),
n.Ip4Address,
n.NetworkNamespace,
); err != nil {
return err
}
}
return nil
}
func (n *NetInterface) configure() error {
cmd := ipCommandMap[n.Type()](n)
_, err := cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("creating interface '%v' failed: %v", n.Name(), err)
}
if err := n.configureUpState(); err != nil {
return err
}
if err := n.configureNetworkNamespace(); err != nil {
return err
}
if err := n.configureAddress(); err != nil {
return err
}
if n.Peer != nil && n.Peer.name != "" {
if err := n.Peer.configureUpState(); err != nil {
return err
}
if err := n.Peer.configureNetworkNamespace(); err != nil {
return err
}
if err := n.Peer.configureAddress(); err != nil {
return err
}
}
return nil
}
func (n *NetInterface) unconfigure() {
delLink(n.name)
}
func (n *NetInterface) Name() string {
return n.name
}
func (n *NetInterface) Type() string {
return n.category
}
func (n *NetInterface) AddressWithPrefix() AddressWithPrefix {
address, _ := ip_types.ParseAddressWithPrefix(n.Ip4Address)
return address
}
func (n *NetInterface) Ip4AddressWithPrefix() IP4AddressWithPrefix {
ip4Prefix, _ := ip_types.ParseIP4Prefix(n.Ip4Address)
Ip4AddressWithPrefix := ip_types.IP4AddressWithPrefix(ip4Prefix)
return Ip4AddressWithPrefix
}
func (n *NetInterface) Ip4AddressString() string {
return strings.Split(n.Ip4Address, "/")[0]
}
func (b *NetConfigBase) Name() string {
return b.name
}
func (b *NetConfigBase) Type() string {
return b.category
}
func newNetNamespace(cfg NetDevConfig) (NetworkNamespace, error) {
var networkNamespace NetworkNamespace
networkNamespace.name = cfg["name"].(string)
networkNamespace.category = NetNs
return networkNamespace, nil
}
func (ns *NetworkNamespace) configure() error {
return addDelNetns(ns.name, true)
}
func (ns *NetworkNamespace) unconfigure() {
addDelNetns(ns.name, false)
}
func newBridge(cfg NetDevConfig) (NetworkBridge, error) {
var bridge NetworkBridge
bridge.name = cfg["name"].(string)
bridge.category = Bridge
for _, v := range cfg["interfaces"].([]interface{}) {
bridge.Interfaces = append(bridge.Interfaces, v.(string))
}
bridge.NetworkNamespace = ""
if netns, ok := cfg["netns"]; ok {
bridge.NetworkNamespace = netns.(string)
}
return bridge, nil
}
func (b *NetworkBridge) configure() error {
return addBridge(b.name, b.Interfaces, b.NetworkNamespace)
}
func (b *NetworkBridge) unconfigure() {
delBridge(b.name, b.NetworkNamespace)
}
func delBridge(brName, ns string) error {
err := setDevDown(brName, ns)
if err != nil {
return err
}
err = addDelBridge(brName, ns, false)
if err != nil {
return err
}
return nil
}
func setDevUp(dev, ns string) error {
return setDevUpDown(dev, ns, true)
}
func setDevDown(dev, ns string) error {
return setDevUpDown(dev, ns, false)
}
func delLink(ifName string) {
cmd := exec.Command("ip", "link", "del", ifName)
cmd.Run()
}
func setDevUpDown(dev, ns string, isUp bool) error {
var op string
if isUp {
op = "up"
} else {
op = "down"
}
c := []string{"ip", "link", "set", "dev", dev, op}
cmd := appendNetns(c, ns)
err := cmd.Run()
if err != nil {
return fmt.Errorf("error bringing %s device %s! (cmd: '%s')", dev, op, cmd)
}
return nil
}
func addDelNetns(name string, isAdd bool) error {
var op string
if isAdd {
op = "add"
} else {
op = "del"
}
cmd := exec.Command("ip", "netns", op, name)
_, err := cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("add/del netns failed (cmd: '%s')", cmd)
}
return nil
}
func linkSetNetns(ifName, ns string) error {
cmd := exec.Command("ip", "link", "set", "dev", ifName, "up", "netns", ns)
err := cmd.Run()
if err != nil {
return fmt.Errorf("error setting device '%s' to netns '%s: %v", ifName, ns, err)
}
return nil
}
func newCommand(s []string, ns string) *exec.Cmd {
return appendNetns(s, ns)
}
func appendNetns(s []string, ns string) *exec.Cmd {
var cmd *exec.Cmd
if ns == "" {
// use default namespace
cmd = exec.Command(s[0], s[1:]...)
} else {
var args = []string{"netns", "exec", ns}
args = append(args, s[:]...)
cmd = exec.Command("ip", args...)
}
return cmd
}
func addDelBridge(brName, ns string, isAdd bool) error {
var op string
if isAdd {
op = "addbr"
} else {
op = "delbr"
}
var c = []string{"brctl", op, brName}
cmd := appendNetns(c, ns)
err := cmd.Run()
if err != nil {
s := fmt.Sprintf("%s %s failed! err: '%s'", op, brName, err)
return errors.New(s)
}
return nil
}
func addBridge(brName string, ifs []string, ns string) error {
err := addDelBridge(brName, ns, true)
if err != nil {
return err
}
for _, v := range ifs {
c := []string{"brctl", "addif", brName, v}
cmd := appendNetns(c, ns)
err = cmd.Run()
if err != nil {
return fmt.Errorf("error adding %s to bridge %s: %s", v, brName, err)
}
}
err = setDevUp(brName, ns)
if err != nil {
return err
}
return nil
}
|