mirror of
https://github.com/tailscale/tailscale.git
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390 lines
9.4 KiB
Go
390 lines
9.4 KiB
Go
/* SPDX-License-Identifier: MIT
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*
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* Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
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*/
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package router
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import (
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"bytes"
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"encoding/binary"
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"errors"
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"fmt"
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"log"
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"net"
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"sort"
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"time"
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"unsafe"
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ole "github.com/go-ole/go-ole"
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winipcfg "github.com/tailscale/winipcfg-go"
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"github.com/tailscale/wireguard-go/conn"
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"github.com/tailscale/wireguard-go/device"
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"github.com/tailscale/wireguard-go/tun"
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"golang.org/x/sys/windows"
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"tailscale.com/wgengine/winnet"
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)
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const (
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sockoptIP_UNICAST_IF = 31
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sockoptIPV6_UNICAST_IF = 31
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)
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func htonl(val uint32) uint32 {
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bytes := make([]byte, 4)
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binary.BigEndian.PutUint32(bytes, val)
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return *(*uint32)(unsafe.Pointer(&bytes[0]))
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}
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func bindSocketRoute(family winipcfg.AddressFamily, device *device.Device, ourLuid uint64, lastLuid *uint64) error {
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routes, err := winipcfg.GetRoutes(family)
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if err != nil {
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return err
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}
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lowestMetric := ^uint32(0)
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index := uint32(0) // Zero is "unspecified", which for IP_UNICAST_IF resets the value, which is what we want.
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luid := uint64(0) // Hopefully luid zero is unspecified, but hard to find docs saying so.
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for _, route := range routes {
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if route.DestinationPrefix.PrefixLength != 0 || route.InterfaceLuid == ourLuid {
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continue
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}
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if route.Metric < lowestMetric {
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lowestMetric = route.Metric
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index = route.InterfaceIndex
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luid = route.InterfaceLuid
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}
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}
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if luid == *lastLuid {
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return nil
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}
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*lastLuid = luid
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if false {
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bind, ok := device.Bind().(conn.BindSocketToInterface)
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if !ok {
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return fmt.Errorf("unexpected device.Bind type %T", device.Bind())
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}
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// TODO(apenwarr): doesn't work with magic socket yet.
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if family == winipcfg.AF_INET {
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return bind.BindSocketToInterface4(index, false)
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} else if family == winipcfg.AF_INET6 {
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return bind.BindSocketToInterface6(index, false)
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}
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} else {
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log.Printf("WARNING: skipping windows socket binding.\n")
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}
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return nil
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}
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func monitorDefaultRoutes(device *device.Device, autoMTU bool, tun *tun.NativeTun) (*winipcfg.RouteChangeCallback, error) {
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guid := tun.GUID()
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ourLuid, err := winipcfg.InterfaceGuidToLuid(&guid)
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lastLuid4 := uint64(0)
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lastLuid6 := uint64(0)
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lastMtu := uint32(0)
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if err != nil {
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return nil, err
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}
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doIt := func() error {
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err = bindSocketRoute(winipcfg.AF_INET, device, ourLuid, &lastLuid4)
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if err != nil {
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return err
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}
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err = bindSocketRoute(winipcfg.AF_INET6, device, ourLuid, &lastLuid6)
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if err != nil {
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return err
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}
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if !autoMTU {
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return nil
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}
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mtu := uint32(0)
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if lastLuid4 != 0 {
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iface, err := winipcfg.InterfaceFromLUID(lastLuid4)
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if err != nil {
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return err
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}
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if iface.Mtu > 0 {
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mtu = iface.Mtu
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}
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}
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if lastLuid6 != 0 {
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iface, err := winipcfg.InterfaceFromLUID(lastLuid6)
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if err != nil {
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return err
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}
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if iface.Mtu > 0 && iface.Mtu < mtu {
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mtu = iface.Mtu
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}
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}
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if mtu > 0 && (lastMtu == 0 || lastMtu != mtu) {
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iface, err := winipcfg.GetIpInterface(ourLuid, winipcfg.AF_INET)
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if err != nil {
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return err
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}
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iface.NlMtu = mtu - 80
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// If the TUN device was created with a smaller MTU,
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// though, such as 1280, we don't want to go bigger than
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// configured. (See the comment on minimalMTU in the
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// wgengine package.)
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if min, err := tun.MTU(); err == nil && min < int(iface.NlMtu) {
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iface.NlMtu = uint32(min)
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}
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if iface.NlMtu < 576 {
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iface.NlMtu = 576
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}
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err = iface.Set()
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if err != nil {
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return err
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}
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tun.ForceMTU(int(iface.NlMtu)) //TODO: it sort of breaks the model with v6 mtu and v4 mtu being different. Just set v4 one for now.
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iface, err = winipcfg.GetIpInterface(ourLuid, winipcfg.AF_INET6)
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if err != nil {
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return err
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}
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iface.NlMtu = mtu - 80
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if iface.NlMtu < 1280 {
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iface.NlMtu = 1280
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}
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err = iface.Set()
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if err != nil {
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return err
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}
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lastMtu = mtu
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}
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return nil
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}
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err = doIt()
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if err != nil {
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return nil, err
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}
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cb, err := winipcfg.RegisterRouteChangeCallback(func(notificationType winipcfg.MibNotificationType, route *winipcfg.Route) {
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//fmt.Printf("MonitorDefaultRoutes: changed: %v\n", route.DestinationPrefix)
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if route.DestinationPrefix.PrefixLength == 0 {
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_ = doIt()
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}
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})
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if err != nil {
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return nil, err
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}
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return cb, nil
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}
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func setFirewall(ifcGUID *windows.GUID) (bool, error) {
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c := ole.Connection{}
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err := c.Initialize()
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if err != nil {
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return false, fmt.Errorf("c.Initialize: %v", err)
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}
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defer c.Uninitialize()
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m, err := winnet.NewNetworkListManager(&c)
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if err != nil {
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return false, fmt.Errorf("winnet.NewNetworkListManager: %v", err)
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}
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defer m.Release()
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cl, err := m.GetNetworkConnections()
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if err != nil {
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return false, fmt.Errorf("m.GetNetworkConnections: %v", err)
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}
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defer cl.Release()
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for _, nco := range cl {
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aid, err := nco.GetAdapterId()
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if err != nil {
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return false, fmt.Errorf("nco.GetAdapterId: %v", err)
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}
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if aid != ifcGUID.String() {
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log.Printf("skipping adapter id: %v\n", aid)
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continue
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}
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log.Printf("found! adapter id: %v\n", aid)
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n, err := nco.GetNetwork()
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if err != nil {
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return false, fmt.Errorf("GetNetwork: %v", err)
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}
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defer n.Release()
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cat, err := n.GetCategory()
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if err != nil {
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return false, fmt.Errorf("GetCategory: %v", err)
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}
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if cat == 0 {
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err = n.SetCategory(1)
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if err != nil {
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return false, fmt.Errorf("SetCategory: %v", err)
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}
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} else {
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log.Printf("setFirewall: already category %v\n", cat)
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}
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return true, nil
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}
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return false, nil
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}
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func configureInterface(cfg *Config, tun *tun.NativeTun) error {
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const mtu = 0
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guid := tun.GUID()
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log.Printf("wintun GUID is %v\n", guid)
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iface, err := winipcfg.InterfaceFromGUID(&guid)
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if err != nil {
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return err
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}
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go func() {
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// It takes a weirdly long time for Windows to notice the
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// new interface has come up. Poll periodically until it
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// does.
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for i := 0; i < 20; i++ {
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found, err := setFirewall(&guid)
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if err != nil {
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log.Printf("setFirewall: %v\n", err)
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// fall through anyway, this isn't fatal.
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}
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if found {
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break
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}
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time.Sleep(1 * time.Second)
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}
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}()
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routes := []winipcfg.RouteData{}
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var firstGateway4 *net.IP
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var firstGateway6 *net.IP
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addresses := make([]*net.IPNet, len(cfg.LocalAddrs))
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for i, addr := range cfg.LocalAddrs {
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ipnet := addr.IPNet()
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addresses[i] = ipnet
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gateway := ipnet.IP
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if addr.IP.Is4() && firstGateway4 == nil {
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firstGateway4 = &gateway
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} else if addr.IP.Is6() && firstGateway6 == nil {
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firstGateway6 = &gateway
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}
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}
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foundDefault4 := false
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foundDefault6 := false
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for _, route := range cfg.Routes {
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if (route.IP.Is4() && firstGateway4 == nil) || (route.IP.Is6() && firstGateway6 == nil) {
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return errors.New("Due to a Windows limitation, one cannot have interface routes without an interface address")
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}
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ipn := route.IPNet()
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var gateway net.IP
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if route.IP.Is4() {
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gateway = *firstGateway4
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} else if route.IP.Is6() {
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gateway = *firstGateway6
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}
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r := winipcfg.RouteData{
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Destination: net.IPNet{
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IP: ipn.IP.Mask(ipn.Mask),
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Mask: ipn.Mask,
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},
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NextHop: gateway,
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Metric: 0,
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}
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if bytes.Compare(r.Destination.IP, gateway) == 0 {
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// no need to add a route for the interface's
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// own IP. The kernel does that for us.
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// If we try to replace it, we'll fail to
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// add the route unless NextHop is set, but
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// then the interface's IP won't be pingable.
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continue
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}
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if route.IP.Is4() {
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if route.Bits == 0 {
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foundDefault4 = true
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}
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r.NextHop = *firstGateway4
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} else if route.IP.Is6() {
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if route.Bits == 0 {
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foundDefault6 = true
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}
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r.NextHop = *firstGateway6
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}
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routes = append(routes, r)
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}
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err = iface.SyncAddresses(addresses)
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if err != nil {
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return err
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}
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sort.Slice(routes, func(i, j int) bool {
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return (bytes.Compare(routes[i].Destination.IP, routes[j].Destination.IP) == -1 ||
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// Narrower masks first
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bytes.Compare(routes[i].Destination.Mask, routes[j].Destination.Mask) == 1 ||
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// No nexthop before non-empty nexthop
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bytes.Compare(routes[i].NextHop, routes[j].NextHop) == -1 ||
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// Lower metrics first
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routes[i].Metric < routes[j].Metric)
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})
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deduplicatedRoutes := []*winipcfg.RouteData{}
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for i := 0; i < len(routes); i++ {
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// There's only one way to get to a given IP+Mask, so delete
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// all matches after the first.
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if i > 0 &&
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bytes.Equal(routes[i].Destination.IP, routes[i-1].Destination.IP) &&
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bytes.Equal(routes[i].Destination.Mask, routes[i-1].Destination.Mask) {
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continue
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}
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deduplicatedRoutes = append(deduplicatedRoutes, &routes[i])
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}
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log.Printf("routes: %v\n", routes)
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var errAcc error
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err = iface.SyncRoutes(deduplicatedRoutes)
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if err != nil && errAcc == nil {
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log.Printf("setroutes: %v\n", err)
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errAcc = err
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}
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ipif, err := iface.GetIpInterface(winipcfg.AF_INET)
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if err != nil {
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log.Printf("getipif: %v\n", err)
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return err
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}
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log.Printf("foundDefault4: %v\n", foundDefault4)
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if foundDefault4 {
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ipif.UseAutomaticMetric = false
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ipif.Metric = 0
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}
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if mtu > 0 {
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ipif.NlMtu = uint32(mtu)
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tun.ForceMTU(int(ipif.NlMtu))
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}
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err = ipif.Set()
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if err != nil && errAcc == nil {
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errAcc = err
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}
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ipif, err = iface.GetIpInterface(winipcfg.AF_INET6)
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if err != nil {
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return err
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}
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if err != nil && errAcc == nil {
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errAcc = err
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}
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if foundDefault6 {
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ipif.UseAutomaticMetric = false
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ipif.Metric = 0
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}
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if mtu > 0 {
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ipif.NlMtu = uint32(mtu)
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}
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ipif.DadTransmits = 0
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ipif.RouterDiscoveryBehavior = winipcfg.RouterDiscoveryDisabled
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err = ipif.Set()
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if err != nil && errAcc == nil {
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errAcc = err
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}
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return errAcc
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}
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