nebula/overlay/tun_freebsd.go

123 lines
3.1 KiB
Go

//go:build !e2e_testing
// +build !e2e_testing
package overlay
import (
"fmt"
"io"
"net"
"os"
"os/exec"
"regexp"
"strconv"
"strings"
"github.com/sirupsen/logrus"
"github.com/slackhq/nebula/cidr"
"github.com/slackhq/nebula/iputil"
)
var deviceNameRE = regexp.MustCompile(`^tun[0-9]+$`)
type tun struct {
Device string
cidr *net.IPNet
MTU int
Routes []Route
routeTree *cidr.Tree4
l *logrus.Logger
io.ReadWriteCloser
}
func (t *tun) Close() error {
if t.ReadWriteCloser != nil {
return t.ReadWriteCloser.Close()
}
return nil
}
func newTunFromFd(_ *logrus.Logger, _ int, _ *net.IPNet, _ int, _ []Route, _ int) (*tun, error) {
return nil, fmt.Errorf("newTunFromFd not supported in FreeBSD")
}
func newTun(l *logrus.Logger, deviceName string, cidr *net.IPNet, defaultMTU int, routes []Route, _ int, _ bool) (*tun, error) {
routeTree, err := makeRouteTree(routes, false)
if err != nil {
return nil, err
}
if strings.HasPrefix(deviceName, "/dev/") {
deviceName = strings.TrimPrefix(deviceName, "/dev/")
}
if !deviceNameRE.MatchString(deviceName) {
return nil, fmt.Errorf("tun.dev must match `tun[0-9]+`")
}
return &tun{
Device: deviceName,
cidr: cidr,
MTU: defaultMTU,
Routes: routes,
routeTree: routeTree,
l: l,
}, nil
}
func (t *tun) Activate() error {
var err error
t.ReadWriteCloser, err = os.OpenFile("/dev/"+t.Device, os.O_RDWR, 0)
if err != nil {
return fmt.Errorf("activate failed: %v", err)
}
// TODO use syscalls instead of exec.Command
t.l.Debug("command: ifconfig", t.Device, t.cidr.String(), t.cidr.IP.String())
if err = exec.Command("/sbin/ifconfig", t.Device, t.cidr.String(), t.cidr.IP.String()).Run(); err != nil {
return fmt.Errorf("failed to run 'ifconfig': %s", err)
}
t.l.Debug("command: route", "-n", "add", "-net", t.cidr.String(), "-interface", t.Device)
if err = exec.Command("/sbin/route", "-n", "add", "-net", t.cidr.String(), "-interface", t.Device).Run(); err != nil {
return fmt.Errorf("failed to run 'route add': %s", err)
}
t.l.Debug("command: ifconfig", t.Device, "mtu", strconv.Itoa(t.MTU))
if err = exec.Command("/sbin/ifconfig", t.Device, "mtu", strconv.Itoa(t.MTU)).Run(); err != nil {
return fmt.Errorf("failed to run 'ifconfig': %s", err)
}
// Unsafe path routes
for _, r := range t.Routes {
if r.Via == nil {
// We don't allow route MTUs so only install routes with a via
continue
}
t.l.Debug("command: route", "-n", "add", "-net", r.Cidr.String(), "-interface", t.Device)
if err = exec.Command("/sbin/route", "-n", "add", "-net", r.Cidr.String(), "-interface", t.Device).Run(); err != nil {
return fmt.Errorf("failed to run 'route add' for unsafe_route %s: %s", r.Cidr.String(), err)
}
}
return nil
}
func (t *tun) RouteFor(ip iputil.VpnIp) iputil.VpnIp {
r := t.routeTree.MostSpecificContains(ip)
if r != nil {
return r.(iputil.VpnIp)
}
return 0
}
func (t *tun) Cidr() *net.IPNet {
return t.cidr
}
func (t *tun) Name() string {
return t.Device
}
func (t *tun) NewMultiQueueReader() (io.ReadWriteCloser, error) {
return nil, fmt.Errorf("TODO: multiqueue not implemented for freebsd")
}