// Copyright (c) Tailscale Inc & AUTHORS // SPDX-License-Identifier: BSD-3-Clause package router import ( "fmt" "math/rand" "net/netip" "reflect" "strings" "testing" "golang.zx2c4.com/wireguard/windows/tunnel/winipcfg" ) func randIP() netip.Addr { b := byte(rand.Intn(3)) return netip.AddrFrom4([4]byte{b, b, b, b}) } func randRouteData() *winipcfg.RouteData { return &winipcfg.RouteData{ Destination: netip.PrefixFrom(randIP(), rand.Intn(30)+1), NextHop: randIP(), Metric: uint32(rand.Intn(3)), } } func TestRouteLess(t *testing.T) { type D = winipcfg.RouteData ipnet := netip.MustParsePrefix tests := []struct { ri, rj *winipcfg.RouteData want bool }{ { ri: &D{Metric: 1}, rj: &D{Metric: 2}, want: true, }, { ri: &D{Destination: ipnet("1.1.0.0/16"), Metric: 2}, rj: &D{Destination: ipnet("2.2.0.0/16"), Metric: 1}, want: true, }, { ri: &D{Destination: ipnet("1.1.0.0/16"), Metric: 1}, rj: &D{Destination: ipnet("2.2.0.0/16"), Metric: 1}, want: true, }, { ri: &D{Destination: ipnet("1.1.0.0/32"), Metric: 2}, rj: &D{Destination: ipnet("1.1.0.0/16"), Metric: 1}, want: true, }, { ri: &D{Destination: ipnet("1.1.0.0/32"), Metric: 1}, rj: &D{Destination: ipnet("1.1.0.0/16"), Metric: 1}, want: true, }, { ri: &D{Destination: ipnet("1.1.0.0/16"), Metric: 1, NextHop: netip.MustParseAddr("3.3.3.3")}, rj: &D{Destination: ipnet("1.1.0.0/16"), Metric: 1, NextHop: netip.MustParseAddr("4.4.4.4")}, want: true, }, } for i, tt := range tests { got := routeDataLess(tt.ri, tt.rj) if got != tt.want { t.Errorf("%v. less = %v; want %v", i, got, tt.want) } back := routeDataLess(tt.rj, tt.ri) if back && got { t.Errorf("%v. less both ways", i) } } } func TestRouteDataLessConsistent(t *testing.T) { for i := 0; i < 10000; i++ { ri := randRouteData() rj := randRouteData() if routeDataLess(ri, rj) && routeDataLess(rj, ri) { t.Fatalf("both compare less to each other:\n\t%#v\nand\n\t%#v", ri, rj) } } } func nets(cidrs ...string) (ret []netip.Prefix) { for _, s := range cidrs { ret = append(ret, netip.MustParsePrefix(s)) } return } func nilIfEmpty[E any](s []E) []E { if len(s) == 0 { return nil } return s } func TestDeltaNets(t *testing.T) { tests := []struct { a, b []netip.Prefix wantAdd, wantDel []netip.Prefix }{ { 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"), b: nets("10.0.1.1/32", "100.0.2.1/32", "1.2.3.3/32", "1.2.3.4/24"), wantAdd: nets("100.0.2.1/32"), wantDel: nets("1.2.3.4/31", "100.0.1.1/32"), }, { a: nets("fe80::99d0:ec2d:b2e7:536b/64", "100.84.36.11/32"), b: nets("100.84.36.11/32"), wantDel: nets("fe80::99d0:ec2d:b2e7:536b/64"), }, { a: nets("100.84.36.11/32", "fe80::99d0:ec2d:b2e7:536b/64"), b: nets("100.84.36.11/32"), wantDel: nets("fe80::99d0:ec2d:b2e7:536b/64"), }, { a: nets("100.84.36.11/32", "fe80::99d0:ec2d:b2e7:536b/64"), b: nets("100.84.36.11/32"), wantDel: nets("fe80::99d0:ec2d:b2e7:536b/64"), }, } for i, tt := range tests { add, del := deltaNets(tt.a, tt.b) if !reflect.DeepEqual(nilIfEmpty(add), nilIfEmpty(tt.wantAdd)) { t.Errorf("[%d] add:\n got: %v\n want: %v\n", i, add, tt.wantAdd) } if !reflect.DeepEqual(nilIfEmpty(del), nilIfEmpty(tt.wantDel)) { t.Errorf("[%d] del:\n got: %v\n want: %v\n", i, del, tt.wantDel) } } } func formatRouteData(rds []*winipcfg.RouteData) string { var b strings.Builder for _, rd := range rds { b.WriteString(fmt.Sprintf("%+v", rd)) } return b.String() } func equalRouteDatas(a, b []*winipcfg.RouteData) bool { if len(a) != len(b) { return false } for i := range a { if routeDataCompare(a[i], b[i]) != 0 { return false } } return true } func ipnet4(ip string, bits int) netip.Prefix { return netip.PrefixFrom(netip.MustParseAddr(ip), bits) } func TestFilterRoutes(t *testing.T) { var h0 netip.Addr in := []*winipcfg.RouteData{ // LinkLocal and Loopback routes. {ipnet4("169.254.0.0", 16), h0, 1}, {ipnet4("169.254.255.255", 32), h0, 1}, {ipnet4("127.0.0.0", 8), h0, 1}, {ipnet4("127.255.255.255", 32), h0, 1}, // Local LAN routes. {ipnet4("192.168.0.0", 24), h0, 1}, {ipnet4("192.168.0.255", 32), h0, 1}, {ipnet4("192.168.1.0", 25), h0, 1}, {ipnet4("192.168.1.127", 32), h0, 1}, // Some random other route. {ipnet4("192.168.2.23", 32), h0, 1}, // Our own tailscale address. {ipnet4("100.100.100.100", 32), h0, 1}, // Other tailscale addresses. {ipnet4("100.100.100.101", 32), h0, 1}, {ipnet4("100.100.100.102", 32), h0, 1}, } want := []*winipcfg.RouteData{ {ipnet4("169.254.0.0", 16), h0, 1}, {ipnet4("127.0.0.0", 8), h0, 1}, {ipnet4("192.168.0.0", 24), h0, 1}, {ipnet4("192.168.1.0", 25), h0, 1}, {ipnet4("192.168.2.23", 32), h0, 1}, {ipnet4("100.100.100.101", 32), h0, 1}, {ipnet4("100.100.100.102", 32), h0, 1}, } got := filterRoutes(in, mustCIDRs("100.100.100.100/32")) if !equalRouteDatas(got, want) { t.Errorf("\ngot: %v\n want: %v\n", formatRouteData(got), formatRouteData(want)) } } func TestDeltaRouteData(t *testing.T) { var h0 netip.Addr h1 := netip.MustParseAddr("99.99.99.99") h2 := netip.MustParseAddr("99.99.9.99") a := []*winipcfg.RouteData{ {ipnet4("1.2.3.4", 32), h0, 1}, {ipnet4("1.2.3.4", 24), h1, 2}, {ipnet4("1.2.3.4", 24), h2, 1}, {ipnet4("1.2.3.5", 32), h0, 1}, } b := []*winipcfg.RouteData{ {ipnet4("1.2.3.5", 32), h0, 1}, {ipnet4("1.2.3.4", 24), h1, 2}, {ipnet4("1.2.3.4", 24), h2, 2}, } add, del := deltaRouteData(a, b) wantAdd := []*winipcfg.RouteData{ {ipnet4("1.2.3.4", 24), h2, 2}, } wantDel := []*winipcfg.RouteData{ {ipnet4("1.2.3.4", 32), h0, 1}, {ipnet4("1.2.3.4", 24), h2, 1}, } if !equalRouteDatas(add, wantAdd) { t.Errorf("add:\n got: %v\n want: %v\n", formatRouteData(add), formatRouteData(wantAdd)) } if !equalRouteDatas(del, wantDel) { t.Errorf("del:\n got: %v\n want: %v\n", formatRouteData(del), formatRouteData(wantDel)) } }