mirror of
https://github.com/netbirdio/netbird.git
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167 lines
3.5 KiB
Go
167 lines
3.5 KiB
Go
package iface
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import (
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"errors"
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"math"
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"os"
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"syscall"
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log "github.com/sirupsen/logrus"
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"github.com/vishvananda/netlink"
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)
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type NativeLink struct {
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Link *netlink.Link
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}
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// WireguardModExists check if we can load wireguard mod (linux only)
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func WireguardModExists() bool {
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link := newWGLink("mustnotexist")
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// We willingly try to create a device with an invalid
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// MTU here as the validation of the MTU will be performed after
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// the validation of the link kind and hence allows us to check
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// for the existance of the wireguard module without actually
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// creating a link.
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//
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// As a side-effect, this will also let the kernel lazy-load
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// the wireguard module.
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link.attrs.MTU = math.MaxInt
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err := netlink.LinkAdd(link)
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return errors.Is(err, syscall.EINVAL)
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}
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// Create creates a new Wireguard interface, sets a given IP and brings it up.
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// Will reuse an existing one.
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func (w *WGIface) Create() error {
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w.mu.Lock()
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defer w.mu.Unlock()
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if WireguardModExists() {
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log.Info("using kernel WireGuard")
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return w.createWithKernel()
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} else {
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log.Info("using userspace WireGuard")
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return w.createWithUserspace()
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}
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}
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// createWithKernel Creates a new Wireguard interface using kernel Wireguard module.
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// Works for Linux and offers much better network performance
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func (w *WGIface) createWithKernel() error {
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link := newWGLink(w.Name)
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// check if interface exists
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l, err := netlink.LinkByName(w.Name)
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if err != nil {
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switch err.(type) {
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case netlink.LinkNotFoundError:
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break
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default:
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return err
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}
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}
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// remove if interface exists
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if l != nil {
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err = netlink.LinkDel(link)
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if err != nil {
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return err
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}
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}
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log.Debugf("adding device: %s", w.Name)
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err = netlink.LinkAdd(link)
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if os.IsExist(err) {
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log.Infof("interface %s already exists. Will reuse.", w.Name)
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} else if err != nil {
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return err
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}
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w.Interface = link
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err = w.assignAddr()
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if err != nil {
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return err
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}
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// todo do a discovery
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log.Debugf("setting MTU: %d interface: %s", w.MTU, w.Name)
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err = netlink.LinkSetMTU(link, w.MTU)
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if err != nil {
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log.Errorf("error setting MTU on interface: %s", w.Name)
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return err
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}
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log.Debugf("bringing up interface: %s", w.Name)
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err = netlink.LinkSetUp(link)
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if err != nil {
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log.Errorf("error bringing up interface: %s", w.Name)
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return err
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}
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return nil
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}
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// assignAddr Adds IP address to the tunnel interface
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func (w *WGIface) assignAddr() error {
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link := newWGLink(w.Name)
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//delete existing addresses
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list, err := netlink.AddrList(link, 0)
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if err != nil {
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return err
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}
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if len(list) > 0 {
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for _, a := range list {
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err = netlink.AddrDel(link, &a)
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if err != nil {
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return err
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}
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}
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}
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log.Debugf("adding address %s to interface: %s", w.Address.String(), w.Name)
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addr, _ := netlink.ParseAddr(w.Address.String())
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err = netlink.AddrAdd(link, addr)
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if os.IsExist(err) {
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log.Infof("interface %s already has the address: %s", w.Name, w.Address.String())
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} else if err != nil {
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return err
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}
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// On linux, the link must be brought up
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err = netlink.LinkSetUp(link)
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return err
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}
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type wgLink struct {
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attrs *netlink.LinkAttrs
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}
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func newWGLink(name string) *wgLink {
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attrs := netlink.NewLinkAttrs()
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attrs.Name = name
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return &wgLink{
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attrs: &attrs,
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}
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}
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// Attrs returns the Wireguard's default attributes
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func (l *wgLink) Attrs() *netlink.LinkAttrs {
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return l.attrs
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}
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// Type returns the interface type
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func (l *wgLink) Type() string {
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return "wireguard"
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}
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// Close deletes the link interface
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func (l *wgLink) Close() error {
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return netlink.LinkDel(l)
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}
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