mirror of
https://github.com/tailscale/tailscale.git
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3fd5f4380f
github.com/go-multierror/multierror served us well. But we need a few feature from it (implement Is), and it's not worth maintaining a fork of such a small module. Instead, I did a clean room implementation inspired by its API. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
814 lines
21 KiB
Go
814 lines
21 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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"errors"
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"fmt"
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"log"
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"net"
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"runtime"
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"sort"
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"time"
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ole "github.com/go-ole/go-ole"
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"golang.org/x/sys/windows"
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"golang.zx2c4.com/wireguard/tun"
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"golang.zx2c4.com/wireguard/windows/tunnel/winipcfg"
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"inet.af/netaddr"
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"tailscale.com/health"
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"tailscale.com/net/interfaces"
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"tailscale.com/net/tsaddr"
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"tailscale.com/util/multierr"
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"tailscale.com/wgengine/winnet"
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)
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// monitorDefaultRoutes subscribes to route change events and updates
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// the Tailscale tunnel interface's MTU to match that of the
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// underlying default route.
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//
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// This is an attempt at making the MTU mostly correct, but in
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// practice this entire piece of code ends up just using the 1280
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// value passed in at device construction time. This code might make
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// the MTU go lower due to very low-MTU IPv4 interfaces.
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//
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// TODO: this code is insufficient to control the MTU correctly. The
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// correct way to do it is per-peer PMTU discovery, and synthesizing
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// ICMP fragmentation-needed messages within tailscaled. This code may
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// address a few rare corner cases, but is unlikely to significantly
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// help with MTU issues compared to a static 1280B implementation.
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func monitorDefaultRoutes(tun *tun.NativeTun) (*winipcfg.RouteChangeCallback, error) {
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ourLuid := winipcfg.LUID(tun.LUID())
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lastMtu := uint32(0)
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doIt := func() error {
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mtu, err := getDefaultRouteMTU()
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if err != nil {
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return fmt.Errorf("error getting default route MTU: %w", err)
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}
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if mtu > 0 && (lastMtu == 0 || lastMtu != mtu) {
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iface, err := ourLuid.IPInterface(windows.AF_INET)
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if err != nil {
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if !errors.Is(err, windows.ERROR_NOT_FOUND) {
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return fmt.Errorf("getting v4 interface: %w", err)
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}
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} else {
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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
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// than configured. (See the comment on minimalMTU in
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// the 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 fmt.Errorf("error setting v4 MTU: %w", err)
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}
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tun.ForceMTU(int(iface.NLMTU))
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}
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iface, err = ourLuid.IPInterface(windows.AF_INET6)
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if err != nil {
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if !errors.Is(err, windows.ERROR_NOT_FOUND) {
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return fmt.Errorf("error getting v6 interface: %w", err)
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}
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} else {
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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 fmt.Errorf("error setting v6 MTU: %w", err)
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}
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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.MibIPforwardRow2) {
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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 getDefaultRouteMTU() (uint32, error) {
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mtus, err := interfaces.NonTailscaleMTUs()
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if err != nil {
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return 0, err
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}
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routes, err := winipcfg.GetIPForwardTable2(windows.AF_INET)
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if err != nil {
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return 0, err
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}
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best := ^uint32(0)
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mtu := uint32(0)
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for _, route := range routes {
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if route.DestinationPrefix.PrefixLength != 0 {
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continue
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}
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routeMTU := mtus[route.InterfaceLUID]
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if routeMTU == 0 {
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continue
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}
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if route.Metric < best {
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best = route.Metric
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mtu = routeMTU
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}
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}
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routes, err = winipcfg.GetIPForwardTable2(windows.AF_INET6)
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if err != nil {
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return 0, err
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}
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best = ^uint32(0)
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for _, route := range routes {
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if route.DestinationPrefix.PrefixLength != 0 {
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continue
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}
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routeMTU := mtus[route.InterfaceLUID]
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if routeMTU == 0 {
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continue
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}
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if route.Metric < best {
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best = route.Metric
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if routeMTU < mtu {
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mtu = routeMTU
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}
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}
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}
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return mtu, nil
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}
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// setPrivateNetwork marks the provided network adapter's category to private.
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// It returns (false, nil) if the adapter was not found.
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func setPrivateNetwork(ifcLUID winipcfg.LUID) (bool, error) {
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// NLM_NETWORK_CATEGORY values.
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const (
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categoryPublic = 0
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categoryPrivate = 1
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categoryDomain = 2
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)
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ifcGUID, err := ifcLUID.GUID()
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if err != nil {
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return false, fmt.Errorf("ifcLUID.GUID: %v", err)
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}
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// Lock OS thread when using OLE, which seems to be a requirement
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// from the Microsoft docs. go-ole doesn't seem to handle it automatically.
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// https://github.com/tailscale/tailscale/issues/921#issuecomment-727526807
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runtime.LockOSThread()
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defer runtime.UnlockOSThread()
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var c ole.Connection
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if err := c.Initialize(); 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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continue
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}
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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 != categoryPrivate {
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if err := n.SetCategory(categoryPrivate); err != nil {
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return false, fmt.Errorf("SetCategory: %v", err)
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}
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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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// interfaceFromLUID returns IPAdapterAddresses with specified LUID.
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func interfaceFromLUID(luid winipcfg.LUID, flags winipcfg.GAAFlags) (*winipcfg.IPAdapterAddresses, error) {
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addresses, err := winipcfg.GetAdaptersAddresses(windows.AF_UNSPEC, flags)
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if err != nil {
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return nil, err
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}
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for _, addr := range addresses {
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if addr.LUID == luid {
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return addr, nil
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}
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}
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return nil, fmt.Errorf("interfaceFromLUID: interface with LUID %v not found", luid)
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}
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func configureInterface(cfg *Config, tun *tun.NativeTun) (retErr error) {
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const mtu = 0
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luid := winipcfg.LUID(tun.LUID())
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iface, err := interfaceFromLUID(luid,
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// Issue 474: on early boot, when the network is still
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// coming up, if the Tailscale service comes up first,
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// the Tailscale adapter it finds might not have the
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// IPv4 service available yet? Try this flag:
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winipcfg.GAAFlagIncludeAllInterfaces,
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)
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if err != nil {
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return fmt.Errorf("getting interface: %w", err)
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}
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// Send non-nil return errors to retErrc, to interrupt our background
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// setPrivateNetwork goroutine.
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retErrc := make(chan error, 1)
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defer func() {
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if retErr != nil {
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retErrc <- retErr
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}
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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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const tries = 20
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for i := 0; i < tries; i++ {
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found, err := setPrivateNetwork(luid)
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health.SetNetworkCategoryHealth(err)
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if err != nil {
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log.Printf("setPrivateNetwork(try=%d): %v", i, err)
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} else {
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if found {
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if i > 0 {
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log.Printf("setPrivateNetwork(try=%d): success", i)
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}
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return
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}
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log.Printf("setPrivateNetwork(try=%d): not found", i)
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}
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select {
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case <-time.After(time.Second):
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case <-retErrc:
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return
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}
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}
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log.Printf("setPrivateNetwork: adapter LUID %v not found after %d tries, giving up", luid, tries)
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}()
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// Figure out which of IPv4 and IPv6 are available. Both protocols
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// can be disabled on a per-interface basis by the user, as well
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// as globally via a registry policy. We skip programming anything
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// related to the disabled protocols, since by definition they're
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// unusable.
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ipif4, err := iface.LUID.IPInterface(windows.AF_INET)
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if err != nil {
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if !errors.Is(err, windows.ERROR_NOT_FOUND) {
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return fmt.Errorf("getting AF_INET interface: %w", err)
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}
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log.Printf("AF_INET interface not found on Tailscale adapter, skipping IPv4 programming")
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ipif4 = nil
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}
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ipif6, err := iface.LUID.IPInterface(windows.AF_INET6)
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if err != nil {
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if !errors.Is(err, windows.ERROR_NOT_FOUND) {
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return fmt.Errorf("getting AF_INET6 interface: %w", err)
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}
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log.Printf("AF_INET6 interface not found on Tailscale adapter, skipping IPv6 programming")
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ipif6 = nil
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}
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// Windows requires routes to have a nexthop. For routes such as
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// ours where the nexthop is meaningless, you're supposed to use
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// one of the local IP addresses of the interface. Find an IPv4
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// and IPv6 address we can use for this purpose.
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var firstGateway4 *net.IP
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var firstGateway6 *net.IP
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addresses := make([]*net.IPNet, 0, len(cfg.LocalAddrs))
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for _, addr := range cfg.LocalAddrs {
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if (addr.IP().Is4() && ipif4 == nil) || (addr.IP().Is6() && ipif6 == nil) {
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// Can't program addresses for disabled protocol.
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continue
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}
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ipnet := addr.IPNet()
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addresses = append(addresses, 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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var routes []winipcfg.RouteData
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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() && ipif4 == nil) || (route.IP().Is6() && ipif6 == nil) {
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// Can't program routes for disabled protocol.
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continue
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}
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if route.IP().Is6() && firstGateway6 == nil {
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// Windows won't let us set IPv6 routes without having an
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// IPv6 local address set. However, when we've configured
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// a default route, we want to forcibly grab IPv6 traffic
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// even if the v6 overlay network isn't configured. To do
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// that, we add a dummy local IPv6 address to serve as a
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// route source.
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ipnet := &net.IPNet{tsaddr.Tailscale4To6Placeholder().IPAddr().IP, net.CIDRMask(128, 128)}
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addresses = append(addresses, ipnet)
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firstGateway6 = &ipnet.IP
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} else if route.IP().Is4() && firstGateway4 == nil {
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// TODO: do same dummy behavior as v6?
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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 net.IP.Equal(r.Destination.IP, gateway) {
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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 = syncAddresses(iface, addresses)
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if err != nil {
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return fmt.Errorf("syncAddresses: %w", err)
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}
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sort.Slice(routes, func(i, j int) bool { return routeLess(&routes[i], &routes[j]) })
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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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net.IP.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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// Re-read interface after syncAddresses.
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iface, err = interfaceFromLUID(luid,
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// Issue 474: on early boot, when the network is still
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// coming up, if the Tailscale service comes up first,
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// the Tailscale adapter it finds might not have the
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// IPv4 service available yet? Try this flag:
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winipcfg.GAAFlagIncludeAllInterfaces,
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)
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if err != nil {
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return fmt.Errorf("getting interface: %w", err)
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}
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var errAcc error
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err = syncRoutes(iface, deduplicatedRoutes, cfg.LocalAddrs)
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if err != nil && errAcc == nil {
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log.Printf("setroutes: %v", err)
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errAcc = err
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}
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if ipif4 != nil {
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ipif4, err = iface.LUID.IPInterface(windows.AF_INET)
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if err != nil {
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return fmt.Errorf("getting AF_INET interface: %w", err)
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}
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if foundDefault4 {
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ipif4.UseAutomaticMetric = false
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ipif4.Metric = 0
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}
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if mtu > 0 {
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ipif4.NLMTU = uint32(mtu)
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tun.ForceMTU(int(ipif4.NLMTU))
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}
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err = ipif4.Set()
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if err != nil && errAcc == nil {
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errAcc = err
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}
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}
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if ipif6 != nil {
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ipif6, err = iface.LUID.IPInterface(windows.AF_INET6)
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if err != nil {
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return fmt.Errorf("getting AF_INET6 interface: %w", err)
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} else {
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if foundDefault6 {
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ipif6.UseAutomaticMetric = false
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ipif6.Metric = 0
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}
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if mtu > 0 {
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ipif6.NLMTU = uint32(mtu)
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}
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ipif6.DadTransmits = 0
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ipif6.RouterDiscoveryBehavior = winipcfg.RouterDiscoveryDisabled
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err = ipif6.Set()
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if err != nil && errAcc == nil {
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errAcc = err
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}
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}
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}
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return errAcc
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}
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// routeLess reports whether ri should sort before rj.
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// The actual sort order doesn't appear to matter. The caller just
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// wants them sorted to be able to de-dup.
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func routeLess(ri, rj *winipcfg.RouteData) bool {
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if v := bytes.Compare(ri.Destination.IP, rj.Destination.IP); v != 0 {
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return v == -1
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}
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if v := bytes.Compare(ri.Destination.Mask, rj.Destination.Mask); v != 0 {
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// Narrower masks first
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return v == 1
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}
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if ri.Metric != rj.Metric {
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// Lower metrics first
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return ri.Metric < rj.Metric
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}
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if v := bytes.Compare(ri.NextHop, rj.NextHop); v != 0 {
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// No nexthop before non-empty nexthop.
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return v == -1
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}
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return false
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}
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// unwrapIP returns the shortest version of ip.
|
|
func unwrapIP(ip net.IP) net.IP {
|
|
if ip4 := ip.To4(); ip4 != nil {
|
|
return ip4
|
|
}
|
|
return ip
|
|
}
|
|
|
|
func v4Mask(m net.IPMask) net.IPMask {
|
|
if len(m) == 16 {
|
|
return m[12:]
|
|
}
|
|
return m
|
|
}
|
|
|
|
func netCompare(a, b net.IPNet) int {
|
|
aip, bip := unwrapIP(a.IP), unwrapIP(b.IP)
|
|
v := bytes.Compare(aip, bip)
|
|
if v != 0 {
|
|
return v
|
|
}
|
|
|
|
amask, bmask := a.Mask, b.Mask
|
|
if len(aip) == 4 {
|
|
amask = v4Mask(a.Mask)
|
|
bmask = v4Mask(b.Mask)
|
|
}
|
|
|
|
// narrower first
|
|
return -bytes.Compare(amask, bmask)
|
|
}
|
|
|
|
func sortNets(a []*net.IPNet) {
|
|
sort.Slice(a, func(i, j int) bool {
|
|
return netCompare(*a[i], *a[j]) == -1
|
|
})
|
|
}
|
|
|
|
// deltaNets returns the changes to turn a into b.
|
|
func deltaNets(a, b []*net.IPNet) (add, del []*net.IPNet) {
|
|
add = make([]*net.IPNet, 0, len(b))
|
|
del = make([]*net.IPNet, 0, len(a))
|
|
sortNets(a)
|
|
sortNets(b)
|
|
|
|
i := 0
|
|
j := 0
|
|
for i < len(a) && j < len(b) {
|
|
switch netCompare(*a[i], *b[j]) {
|
|
case -1:
|
|
// a < b, delete
|
|
del = append(del, a[i])
|
|
i++
|
|
case 0:
|
|
// a == b, no diff
|
|
i++
|
|
j++
|
|
case 1:
|
|
// a > b, add missing entry
|
|
add = append(add, b[j])
|
|
j++
|
|
default:
|
|
panic("unexpected compare result")
|
|
}
|
|
}
|
|
del = append(del, a[i:]...)
|
|
add = append(add, b[j:]...)
|
|
return
|
|
}
|
|
|
|
func excludeIPv6LinkLocal(in []*net.IPNet) (out []*net.IPNet) {
|
|
out = in[:0]
|
|
for _, n := range in {
|
|
if len(n.IP) == 16 && n.IP.IsLinkLocalUnicast() {
|
|
continue
|
|
}
|
|
out = append(out, n)
|
|
}
|
|
return out
|
|
}
|
|
|
|
// ipAdapterUnicastAddressToIPNet converts windows.IpAdapterUnicastAddress to net.IPNet.
|
|
func ipAdapterUnicastAddressToIPNet(u *windows.IpAdapterUnicastAddress) *net.IPNet {
|
|
ip := u.Address.IP()
|
|
w := 32
|
|
if ip.To4() == nil {
|
|
w = 128
|
|
}
|
|
return &net.IPNet{
|
|
IP: ip,
|
|
Mask: net.CIDRMask(int(u.OnLinkPrefixLength), w),
|
|
}
|
|
}
|
|
|
|
// unicastIPNets returns all unicast net.IPNet for ifc interface.
|
|
func unicastIPNets(ifc *winipcfg.IPAdapterAddresses) []*net.IPNet {
|
|
nets := make([]*net.IPNet, 0)
|
|
for addr := ifc.FirstUnicastAddress; addr != nil; addr = addr.Next {
|
|
nets = append(nets, ipAdapterUnicastAddressToIPNet(addr))
|
|
}
|
|
return nets
|
|
}
|
|
|
|
// syncAddresses incrementally sets the interface's unicast IP addresses,
|
|
// doing the minimum number of AddAddresses & DeleteAddress calls.
|
|
// This avoids the full FlushAddresses.
|
|
//
|
|
// Any IPv6 link-local addresses are not deleted.
|
|
func syncAddresses(ifc *winipcfg.IPAdapterAddresses, want []*net.IPNet) error {
|
|
var erracc error
|
|
|
|
got := unicastIPNets(ifc)
|
|
add, del := deltaNets(got, want)
|
|
del = excludeIPv6LinkLocal(del)
|
|
for _, a := range del {
|
|
err := ifc.LUID.DeleteIPAddress(*a)
|
|
if err != nil {
|
|
erracc = fmt.Errorf("deleting IP %q: %w", *a, err)
|
|
}
|
|
}
|
|
|
|
for _, a := range add {
|
|
err := ifc.LUID.AddIPAddress(*a)
|
|
if err != nil {
|
|
erracc = fmt.Errorf("adding IP %q: %w", *a, err)
|
|
}
|
|
}
|
|
|
|
return erracc
|
|
}
|
|
|
|
func routeDataCompare(a, b *winipcfg.RouteData) int {
|
|
v := bytes.Compare(a.Destination.IP, b.Destination.IP)
|
|
if v != 0 {
|
|
return v
|
|
}
|
|
|
|
// Narrower masks first
|
|
v = bytes.Compare(a.Destination.Mask, b.Destination.Mask)
|
|
if v != 0 {
|
|
return -v
|
|
}
|
|
|
|
// No nexthop before non-empty nexthop
|
|
v = bytes.Compare(a.NextHop, b.NextHop)
|
|
if v != 0 {
|
|
return v
|
|
}
|
|
|
|
// Lower metrics first
|
|
if a.Metric < b.Metric {
|
|
return -1
|
|
} else if a.Metric > b.Metric {
|
|
return 1
|
|
}
|
|
|
|
return 0
|
|
}
|
|
|
|
func sortRouteData(a []*winipcfg.RouteData) {
|
|
sort.Slice(a, func(i, j int) bool {
|
|
return routeDataCompare(a[i], a[j]) < 0
|
|
})
|
|
}
|
|
|
|
func deltaRouteData(a, b []*winipcfg.RouteData) (add, del []*winipcfg.RouteData) {
|
|
add = make([]*winipcfg.RouteData, 0, len(b))
|
|
del = make([]*winipcfg.RouteData, 0, len(a))
|
|
sortRouteData(a)
|
|
sortRouteData(b)
|
|
|
|
i := 0
|
|
j := 0
|
|
for i < len(a) && j < len(b) {
|
|
switch routeDataCompare(a[i], b[j]) {
|
|
case -1:
|
|
// a < b, delete
|
|
del = append(del, a[i])
|
|
i++
|
|
case 0:
|
|
// a == b, no diff
|
|
i++
|
|
j++
|
|
case 1:
|
|
// a > b, add missing entry
|
|
add = append(add, b[j])
|
|
j++
|
|
default:
|
|
panic("unexpected compare result")
|
|
}
|
|
}
|
|
del = append(del, a[i:]...)
|
|
add = append(add, b[j:]...)
|
|
return
|
|
}
|
|
|
|
// getInterfaceRoutes returns all the interface's routes.
|
|
// Corresponds to GetIpForwardTable2 function, but filtered by interface.
|
|
func getInterfaceRoutes(ifc *winipcfg.IPAdapterAddresses, family winipcfg.AddressFamily) (matches []*winipcfg.MibIPforwardRow2, err error) {
|
|
routes, err := winipcfg.GetIPForwardTable2(family)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
for i := range routes {
|
|
if routes[i].InterfaceLUID == ifc.LUID {
|
|
matches = append(matches, &routes[i])
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
func getAllInterfaceRoutes(ifc *winipcfg.IPAdapterAddresses) ([]*winipcfg.RouteData, error) {
|
|
routes4, err := getInterfaceRoutes(ifc, windows.AF_INET)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
routes6, err := getInterfaceRoutes(ifc, windows.AF_INET6)
|
|
if err != nil {
|
|
// TODO: what if v6 unavailable?
|
|
return nil, err
|
|
}
|
|
rd := make([]*winipcfg.RouteData, 0, len(routes4)+len(routes6))
|
|
for _, r := range routes4 {
|
|
rd = append(rd, &winipcfg.RouteData{
|
|
Destination: r.DestinationPrefix.IPNet(),
|
|
NextHop: r.NextHop.IP(),
|
|
Metric: r.Metric,
|
|
})
|
|
}
|
|
for _, r := range routes6 {
|
|
rd = append(rd, &winipcfg.RouteData{
|
|
Destination: r.DestinationPrefix.IPNet(),
|
|
NextHop: r.NextHop.IP(),
|
|
Metric: r.Metric,
|
|
})
|
|
}
|
|
return rd, nil
|
|
}
|
|
|
|
// filterRoutes removes routes that have been added by Windows and should not
|
|
// be managed by us.
|
|
func filterRoutes(routes []*winipcfg.RouteData, dontDelete []netaddr.IPPrefix) []*winipcfg.RouteData {
|
|
ddm := make(map[netaddr.IPPrefix]bool)
|
|
for _, dd := range dontDelete {
|
|
// See issue 1448: we don't want to touch the routes added
|
|
// by Windows for our interface addresses.
|
|
ddm[dd] = true
|
|
}
|
|
for _, r := range routes {
|
|
// We don't want to touch broadcast routes that Windows adds.
|
|
nr, ok := netaddr.FromStdIPNet(&r.Destination)
|
|
if !ok {
|
|
continue
|
|
}
|
|
if nr.IsSingleIP() {
|
|
continue
|
|
}
|
|
lastIP := nr.Range().To()
|
|
ddm[netaddr.IPPrefixFrom(lastIP, lastIP.BitLen())] = true
|
|
}
|
|
filtered := make([]*winipcfg.RouteData, 0, len(routes))
|
|
for _, r := range routes {
|
|
rr, ok := netaddr.FromStdIPNet(&r.Destination)
|
|
if ok && ddm[rr] {
|
|
continue
|
|
}
|
|
filtered = append(filtered, r)
|
|
}
|
|
return filtered
|
|
}
|
|
|
|
// syncRoutes incrementally sets multiples routes on an interface.
|
|
// This avoids a full ifc.FlushRoutes call.
|
|
// dontDelete is a list of interface address routes that the
|
|
// synchronization logic should never delete.
|
|
func syncRoutes(ifc *winipcfg.IPAdapterAddresses, want []*winipcfg.RouteData, dontDelete []netaddr.IPPrefix) error {
|
|
existingRoutes, err := getAllInterfaceRoutes(ifc)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
got := filterRoutes(existingRoutes, dontDelete)
|
|
|
|
add, del := deltaRouteData(got, want)
|
|
|
|
var errs []error
|
|
for _, a := range del {
|
|
err := ifc.LUID.DeleteRoute(a.Destination, a.NextHop)
|
|
if err != nil {
|
|
dstStr := a.Destination.String()
|
|
if dstStr == "169.254.255.255/32" {
|
|
// Issue 785. Ignore these routes
|
|
// failing to delete. Harmless.
|
|
// TODO(maisem): do we still need this?
|
|
continue
|
|
}
|
|
errs = append(errs, fmt.Errorf("deleting route %v: %w", dstStr, err))
|
|
}
|
|
}
|
|
|
|
for _, a := range add {
|
|
err := ifc.LUID.AddRoute(a.Destination, a.NextHop, a.Metric)
|
|
if err != nil {
|
|
errs = append(errs, fmt.Errorf("adding route %v: %w", &a.Destination, err))
|
|
}
|
|
}
|
|
|
|
return multierr.New(errs...)
|
|
}
|