mirror of
https://github.com/tailscale/tailscale.git
synced 2024-12-14 04:04:42 +00:00
2903d42921
Fixes #4647 It seems that Windows creates a link-local address for the TUN driver, seemingly based on the (fixed) adapter GUID. This results in a fixed MAC address, which for some reason doesn't handle loopback correctly. Given the derived link-local address is preferred for lookups (thanks LLMNR), traffic which addresses the current node by hostname uses this broken address and never works. To address this, we remove the broken link-local address from the wintun adapter. Signed-off-by: Tom DNetto <tom@tailscale.com>
287 lines
7.0 KiB
Go
287 lines
7.0 KiB
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package router
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import (
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"fmt"
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"math/rand"
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"net"
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"strings"
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"testing"
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"golang.zx2c4.com/wireguard/windows/tunnel/winipcfg"
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"inet.af/netaddr"
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)
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func randIP() net.IP {
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b := byte(rand.Intn(3))
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return net.IP{b, b, b, b}
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}
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func randRouteData() *winipcfg.RouteData {
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return &winipcfg.RouteData{
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Destination: net.IPNet{
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IP: randIP(),
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Mask: net.CIDRMask(rand.Intn(3)+1, 32),
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},
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NextHop: randIP(),
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Metric: uint32(rand.Intn(3)),
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}
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}
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func TestRouteLess(t *testing.T) {
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type D = winipcfg.RouteData
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ipnet := func(s string) net.IPNet {
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ipp, err := netaddr.ParseIPPrefix(s)
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if err != nil {
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t.Fatalf("error parsing test data %q: %v", s, err)
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}
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return *ipp.IPNet()
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}
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tests := []struct {
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ri, rj *winipcfg.RouteData
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want bool
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}{
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{
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ri: &D{Metric: 1},
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rj: &D{Metric: 2},
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want: true,
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},
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{
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ri: &D{Destination: ipnet("1.1.0.0/16"), Metric: 2},
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rj: &D{Destination: ipnet("2.2.0.0/16"), Metric: 1},
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want: true,
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},
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{
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ri: &D{Destination: ipnet("1.1.0.0/16"), Metric: 1},
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rj: &D{Destination: ipnet("2.2.0.0/16"), Metric: 1},
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want: true,
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},
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{
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ri: &D{Destination: ipnet("1.1.0.0/32"), Metric: 2},
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rj: &D{Destination: ipnet("1.1.0.0/16"), Metric: 1},
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want: true,
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},
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{
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ri: &D{Destination: ipnet("1.1.0.0/32"), Metric: 1},
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rj: &D{Destination: ipnet("1.1.0.0/16"), Metric: 1},
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want: true,
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},
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{
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ri: &D{Destination: ipnet("1.1.0.0/16"), Metric: 1, NextHop: net.ParseIP("3.3.3.3")},
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rj: &D{Destination: ipnet("1.1.0.0/16"), Metric: 1, NextHop: net.ParseIP("4.4.4.4")},
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want: true,
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},
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}
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for i, tt := range tests {
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got := routeLess(tt.ri, tt.rj)
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if got != tt.want {
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t.Errorf("%v. less = %v; want %v", i, got, tt.want)
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}
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back := routeLess(tt.rj, tt.ri)
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if back && got {
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t.Errorf("%v. less both ways", i)
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}
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}
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}
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func TestRouteLessConsistent(t *testing.T) {
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for i := 0; i < 10000; i++ {
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ri := randRouteData()
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rj := randRouteData()
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if routeLess(ri, rj) && routeLess(rj, ri) {
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t.Fatalf("both compare less to each other:\n\t%#v\nand\n\t%#v", ri, rj)
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}
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}
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}
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func equalNetIPs(a, b []*net.IPNet) bool {
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if len(a) != len(b) {
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return false
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}
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for i := range a {
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if netCompare(*a[i], *b[i]) != 0 {
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return false
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}
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}
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return true
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}
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func ipnet4(ip string, bits int) *net.IPNet {
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return &net.IPNet{
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IP: net.ParseIP(ip),
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Mask: net.CIDRMask(bits, 32),
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}
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}
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// each cidr can end in "[4]" to mean To4 form.
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func nets(cidrs ...string) (ret []*net.IPNet) {
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for _, s := range cidrs {
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to4 := strings.HasSuffix(s, "[4]")
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if to4 {
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s = strings.TrimSuffix(s, "[4]")
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}
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ip, ipNet, err := net.ParseCIDR(s)
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if err != nil {
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panic(fmt.Sprintf("Bogus CIDR %q in test", s))
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}
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if to4 {
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ip = ip.To4()
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}
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ipNet.IP = ip
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ret = append(ret, ipNet)
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}
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return
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}
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func TestDeltaNets(t *testing.T) {
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tests := []struct {
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a, b []*net.IPNet
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wantAdd, wantDel []*net.IPNet
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}{
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{
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a: nets("1.2.3.4/24", "1.2.3.4/31", "1.2.3.3/32", "10.0.1.1/32", "100.0.1.1/32"),
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b: nets("10.0.1.1/32", "100.0.2.1/32", "1.2.3.3/32", "1.2.3.4/24"),
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wantAdd: nets("100.0.2.1/32"),
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wantDel: nets("1.2.3.4/31", "100.0.1.1/32"),
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},
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{
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a: nets("fe80::99d0:ec2d:b2e7:536b/64", "100.84.36.11/32"),
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b: nets("100.84.36.11/32"),
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wantDel: nets("fe80::99d0:ec2d:b2e7:536b/64"),
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},
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{
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a: nets("100.84.36.11/32", "fe80::99d0:ec2d:b2e7:536b/64"),
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b: nets("100.84.36.11/32"),
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wantDel: nets("fe80::99d0:ec2d:b2e7:536b/64"),
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},
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{
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a: nets("100.84.36.11/32", "fe80::99d0:ec2d:b2e7:536b/64"),
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b: nets("100.84.36.11/32[4]"),
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wantDel: nets("fe80::99d0:ec2d:b2e7:536b/64"),
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},
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{
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a: excludeIPv6LinkLocal(nets("100.84.36.11/32", "fe80::99d0:ec2d:b2e7:536b/64")),
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b: nets("100.84.36.11/32"),
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wantDel: nets("fe80::99d0:ec2d:b2e7:536b/64"),
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},
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{
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a: []*net.IPNet{
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{
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IP: net.ParseIP("1.2.3.4"),
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Mask: net.IPMask{0xff, 0xff, 0xff, 0xff},
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},
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},
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b: []*net.IPNet{
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{
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IP: net.ParseIP("1.2.3.4"),
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Mask: net.IPMask{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff},
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},
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},
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},
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}
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for i, tt := range tests {
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add, del := deltaNets(tt.a, tt.b)
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if !equalNetIPs(add, tt.wantAdd) {
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t.Errorf("[%d] add:\n got: %v\n want: %v\n", i, add, tt.wantAdd)
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}
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if !equalNetIPs(del, tt.wantDel) {
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t.Errorf("[%d] del:\n got: %v\n want: %v\n", i, del, tt.wantDel)
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}
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}
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}
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func formatRouteData(rds []*winipcfg.RouteData) string {
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var b strings.Builder
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for _, rd := range rds {
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b.WriteString(fmt.Sprintf("%+v", rd))
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}
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return b.String()
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}
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func equalRouteDatas(a, b []*winipcfg.RouteData) bool {
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if len(a) != len(b) {
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return false
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}
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for i := range a {
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if routeDataCompare(a[i], b[i]) != 0 {
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return false
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}
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}
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return true
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}
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func TestFilterRoutes(t *testing.T) {
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var h0 net.IP
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in := []*winipcfg.RouteData{
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// LinkLocal and Loopback routes.
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{*ipnet4("169.254.0.0", 16), h0, 1},
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{*ipnet4("169.254.255.255", 32), h0, 1},
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{*ipnet4("127.0.0.0", 8), h0, 1},
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{*ipnet4("127.255.255.255", 32), h0, 1},
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// Local LAN routes.
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{*ipnet4("192.168.0.0", 24), h0, 1},
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{*ipnet4("192.168.0.255", 32), h0, 1},
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{*ipnet4("192.168.1.0", 25), h0, 1},
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{*ipnet4("192.168.1.127", 32), h0, 1},
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// Some random other route.
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{*ipnet4("192.168.2.23", 32), h0, 1},
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// Our own tailscale address.
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{*ipnet4("100.100.100.100", 32), h0, 1},
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// Other tailscale addresses.
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{*ipnet4("100.100.100.101", 32), h0, 1},
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{*ipnet4("100.100.100.102", 32), h0, 1},
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}
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want := []*winipcfg.RouteData{
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{*ipnet4("169.254.0.0", 16), h0, 1},
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{*ipnet4("127.0.0.0", 8), h0, 1},
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{*ipnet4("192.168.0.0", 24), h0, 1},
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{*ipnet4("192.168.1.0", 25), h0, 1},
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{*ipnet4("192.168.2.23", 32), h0, 1},
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{*ipnet4("100.100.100.101", 32), h0, 1},
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{*ipnet4("100.100.100.102", 32), h0, 1},
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}
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got := filterRoutes(in, mustCIDRs("100.100.100.100/32"))
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if !equalRouteDatas(got, want) {
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t.Errorf("\ngot: %v\n want: %v\n", formatRouteData(got), formatRouteData(want))
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}
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}
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func TestDeltaRouteData(t *testing.T) {
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var h0 net.IP
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h1 := net.ParseIP("99.99.99.99")
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h2 := net.ParseIP("99.99.9.99")
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a := []*winipcfg.RouteData{
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{*ipnet4("1.2.3.4", 32), h0, 1},
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{*ipnet4("1.2.3.4", 24), h1, 2},
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{*ipnet4("1.2.3.4", 24), h2, 1},
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{*ipnet4("1.2.3.5", 32), h0, 1},
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}
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b := []*winipcfg.RouteData{
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{*ipnet4("1.2.3.5", 32), h0, 1},
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{*ipnet4("1.2.3.4", 24), h1, 2},
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{*ipnet4("1.2.3.4", 24), h2, 2},
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}
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add, del := deltaRouteData(a, b)
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wantAdd := []*winipcfg.RouteData{
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{*ipnet4("1.2.3.4", 24), h2, 2},
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}
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wantDel := []*winipcfg.RouteData{
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{*ipnet4("1.2.3.4", 32), h0, 1},
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{*ipnet4("1.2.3.4", 24), h2, 1},
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}
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if !equalRouteDatas(add, wantAdd) {
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t.Errorf("add:\n got: %v\n want: %v\n", formatRouteData(add), formatRouteData(wantAdd))
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}
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if !equalRouteDatas(del, wantDel) {
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t.Errorf("del:\n got: %v\n want: %v\n", formatRouteData(del), formatRouteData(wantDel))
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}
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}
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