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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,174 @@ | ||
| //go:build !e2e_testing | ||
| // +build !e2e_testing | ||
|
|
||
| package overlay | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "io" | ||
| "net" | ||
| "os" | ||
| "os/exec" | ||
| "regexp" | ||
| "strconv" | ||
| "syscall" | ||
|
|
||
| "github.com/sirupsen/logrus" | ||
| "github.com/slackhq/nebula/cidr" | ||
| "github.com/slackhq/nebula/iputil" | ||
| ) | ||
|
|
||
| type tun struct { | ||
| Device string | ||
| cidr *net.IPNet | ||
| MTU int | ||
| Routes []Route | ||
| routeTree *cidr.Tree4 | ||
| l *logrus.Logger | ||
|
|
||
| io.ReadWriteCloser | ||
|
|
||
| // cache out buffer since we need to prepend 4 bytes for tun metadata | ||
| out []byte | ||
| } | ||
|
|
||
| func (t *tun) Close() error { | ||
| if t.ReadWriteCloser != nil { | ||
| return t.ReadWriteCloser.Close() | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
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||
| func newTunFromFd(_ *logrus.Logger, _ int, _ *net.IPNet, _ int, _ []Route, _ int, _ bool) (*tun, error) { | ||
| return nil, fmt.Errorf("newTunFromFd not supported in OpenBSD") | ||
| } | ||
|
|
||
| var deviceNameRE = regexp.MustCompile(`^tun[0-9]+$`) | ||
|
|
||
| func newTun(l *logrus.Logger, deviceName string, cidr *net.IPNet, defaultMTU int, routes []Route, _ int, _ bool, _ bool) (*tun, error) { | ||
| if deviceName == "" { | ||
| return nil, fmt.Errorf("a device name in the format of tunN must be specified") | ||
| } | ||
|
|
||
| if !deviceNameRE.MatchString(deviceName) { | ||
| return nil, fmt.Errorf("a device name in the format of tunN must be specified") | ||
| } | ||
|
|
||
| file, err := os.OpenFile("/dev/"+deviceName, os.O_RDWR, 0) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| routeTree, err := makeRouteTree(l, routes, false) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return &tun{ | ||
| ReadWriteCloser: file, | ||
| Device: deviceName, | ||
| cidr: cidr, | ||
| MTU: defaultMTU, | ||
| Routes: routes, | ||
| routeTree: routeTree, | ||
| l: l, | ||
| }, nil | ||
| } | ||
|
|
||
| func (t *tun) Activate() error { | ||
| var err error | ||
| // TODO use syscalls instead of exec.Command | ||
| cmd := exec.Command("/sbin/ifconfig", t.Device, t.cidr.String(), t.cidr.IP.String()) | ||
| t.l.Debug("command: ", cmd.String()) | ||
| if err = cmd.Run(); err != nil { | ||
| return fmt.Errorf("failed to run 'ifconfig': %s", err) | ||
| } | ||
|
|
||
| cmd = exec.Command("/sbin/ifconfig", t.Device, "mtu", strconv.Itoa(t.MTU)) | ||
| t.l.Debug("command: ", cmd.String()) | ||
| if err = cmd.Run(); err != nil { | ||
| return fmt.Errorf("failed to run 'ifconfig': %s", err) | ||
| } | ||
|
|
||
| cmd = exec.Command("/sbin/route", "-n", "add", "-inet", t.cidr.String(), t.cidr.IP.String()) | ||
| t.l.Debug("command: ", cmd.String()) | ||
| if err = cmd.Run(); err != nil { | ||
| return fmt.Errorf("failed to run 'route add': %s", err) | ||
| } | ||
|
|
||
| // Unsafe path routes | ||
| for _, r := range t.Routes { | ||
| if r.Via == nil || !r.Install { | ||
| // We don't allow route MTUs so only install routes with a via | ||
| continue | ||
| } | ||
|
|
||
| cmd = exec.Command("/sbin/route", "-n", "add", "-inet", r.Cidr.String(), t.cidr.IP.String()) | ||
| t.l.Debug("command: ", cmd.String()) | ||
| if err = cmd.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") | ||
| } | ||
|
|
||
| func (t *tun) Read(to []byte) (int, error) { | ||
| buf := make([]byte, len(to)+4) | ||
|
|
||
| n, err := t.ReadWriteCloser.Read(buf) | ||
|
|
||
| copy(to, buf[4:]) | ||
| return n - 4, err | ||
| } | ||
|
|
||
| // Write is only valid for single threaded use | ||
| func (t *tun) Write(from []byte) (int, error) { | ||
| buf := t.out | ||
| if cap(buf) < len(from)+4 { | ||
| buf = make([]byte, len(from)+4) | ||
| t.out = buf | ||
| } | ||
| buf = buf[:len(from)+4] | ||
|
|
||
| if len(from) == 0 { | ||
| return 0, syscall.EIO | ||
| } | ||
|
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||
| // Determine the IP Family for the NULL L2 Header | ||
| ipVer := from[0] >> 4 | ||
| if ipVer == 4 { | ||
| buf[3] = syscall.AF_INET | ||
| } else if ipVer == 6 { | ||
| buf[3] = syscall.AF_INET6 | ||
| } else { | ||
| return 0, fmt.Errorf("unable to determine IP version from packet") | ||
| } | ||
|
|
||
| copy(buf[4:], from) | ||
|
|
||
| n, err := t.ReadWriteCloser.Write(buf) | ||
| return n - 4, err | ||
| } |
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