mirror of
https://github.com/tailscale/tailscale.git
synced 2024-11-26 03:25:35 +00:00
6e967446e4
This is part of an effort to clean up tailscaled initialization between tailscaled, tailscaled Windows service, tsnet, and the mac GUI. Updates #8036 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
458 lines
12 KiB
Go
458 lines
12 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
|
|
// SPDX-License-Identifier: BSD-3-Clause
|
|
|
|
package netstack
|
|
|
|
import (
|
|
"fmt"
|
|
"net/netip"
|
|
"runtime"
|
|
"testing"
|
|
|
|
"tailscale.com/ipn"
|
|
"tailscale.com/ipn/ipnlocal"
|
|
"tailscale.com/ipn/store/mem"
|
|
"tailscale.com/net/packet"
|
|
"tailscale.com/net/tsaddr"
|
|
"tailscale.com/net/tsdial"
|
|
"tailscale.com/net/tstun"
|
|
"tailscale.com/tsd"
|
|
"tailscale.com/tstest"
|
|
"tailscale.com/types/ipproto"
|
|
"tailscale.com/types/logid"
|
|
"tailscale.com/wgengine"
|
|
"tailscale.com/wgengine/filter"
|
|
)
|
|
|
|
// TestInjectInboundLeak tests that injectInbound doesn't leak memory.
|
|
// See https://github.com/tailscale/tailscale/issues/3762
|
|
func TestInjectInboundLeak(t *testing.T) {
|
|
tunDev := tstun.NewFake()
|
|
dialer := new(tsdial.Dialer)
|
|
logf := func(format string, args ...any) {
|
|
if !t.Failed() {
|
|
t.Logf(format, args...)
|
|
}
|
|
}
|
|
sys := new(tsd.System)
|
|
eng, err := wgengine.NewUserspaceEngine(logf, wgengine.Config{
|
|
Tun: tunDev,
|
|
Dialer: dialer,
|
|
SetSubsystem: sys.Set,
|
|
})
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
defer eng.Close()
|
|
sys.Set(eng)
|
|
sys.Set(new(mem.Store))
|
|
|
|
tunWrap := sys.Tun.Get()
|
|
lb, err := ipnlocal.NewLocalBackend(logf, logid.PublicID{}, sys, 0)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
ns, err := Create(logf, tunWrap, eng, sys.MagicSock.Get(), dialer, sys.DNSManager.Get())
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
defer ns.Close()
|
|
ns.ProcessLocalIPs = true
|
|
if err := ns.Start(lb); err != nil {
|
|
t.Fatalf("Start: %v", err)
|
|
}
|
|
ns.atomicIsLocalIPFunc.Store(func(netip.Addr) bool { return true })
|
|
|
|
pkt := &packet.Parsed{}
|
|
const N = 10_000
|
|
ms0 := getMemStats()
|
|
for i := 0; i < N; i++ {
|
|
outcome := ns.injectInbound(pkt, tunWrap)
|
|
if outcome != filter.DropSilently {
|
|
t.Fatalf("got outcome %v; want DropSilently", outcome)
|
|
}
|
|
}
|
|
ms1 := getMemStats()
|
|
if grew := int64(ms1.HeapObjects) - int64(ms0.HeapObjects); grew >= N {
|
|
t.Fatalf("grew by %v (which is too much and >= the %v packets we sent)", grew, N)
|
|
}
|
|
}
|
|
|
|
func getMemStats() (ms runtime.MemStats) {
|
|
runtime.GC()
|
|
runtime.ReadMemStats(&ms)
|
|
return
|
|
}
|
|
|
|
func makeNetstack(t *testing.T, config func(*Impl)) *Impl {
|
|
tunDev := tstun.NewFake()
|
|
sys := &tsd.System{}
|
|
sys.Set(new(mem.Store))
|
|
dialer := new(tsdial.Dialer)
|
|
logf := tstest.WhileTestRunningLogger(t)
|
|
eng, err := wgengine.NewUserspaceEngine(logf, wgengine.Config{
|
|
Tun: tunDev,
|
|
Dialer: dialer,
|
|
SetSubsystem: sys.Set,
|
|
})
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
t.Cleanup(func() { eng.Close() })
|
|
sys.Set(eng)
|
|
|
|
ns, err := Create(logf, sys.Tun.Get(), eng, sys.MagicSock.Get(), dialer, sys.DNSManager.Get())
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
t.Cleanup(func() { ns.Close() })
|
|
|
|
lb, err := ipnlocal.NewLocalBackend(logf, logid.PublicID{}, sys, 0)
|
|
if err != nil {
|
|
t.Fatalf("NewLocalBackend: %v", err)
|
|
}
|
|
|
|
ns.atomicIsLocalIPFunc.Store(func(netip.Addr) bool { return true })
|
|
if config != nil {
|
|
config(ns)
|
|
}
|
|
if err := ns.Start(lb); err != nil {
|
|
t.Fatalf("Start: %v", err)
|
|
}
|
|
return ns
|
|
}
|
|
|
|
func TestShouldHandlePing(t *testing.T) {
|
|
srcIP := netip.AddrFrom4([4]byte{1, 2, 3, 4})
|
|
|
|
t.Run("ICMP4", func(t *testing.T) {
|
|
dst := netip.MustParseAddr("5.6.7.8")
|
|
icmph := packet.ICMP4Header{
|
|
IP4Header: packet.IP4Header{
|
|
IPProto: ipproto.ICMPv4,
|
|
Src: srcIP,
|
|
Dst: dst,
|
|
},
|
|
Type: packet.ICMP4EchoRequest,
|
|
Code: packet.ICMP4NoCode,
|
|
}
|
|
_, payload := packet.ICMPEchoPayload(nil)
|
|
icmpPing := packet.Generate(icmph, payload)
|
|
pkt := &packet.Parsed{}
|
|
pkt.Decode(icmpPing)
|
|
|
|
impl := makeNetstack(t, func(impl *Impl) {
|
|
impl.ProcessSubnets = true
|
|
})
|
|
pingDst, ok := impl.shouldHandlePing(pkt)
|
|
if !ok {
|
|
t.Errorf("expected shouldHandlePing==true")
|
|
}
|
|
if pingDst != dst {
|
|
t.Errorf("got dst %s; want %s", pingDst, dst)
|
|
}
|
|
})
|
|
|
|
t.Run("ICMP6-no-via", func(t *testing.T) {
|
|
dst := netip.MustParseAddr("2a09:8280:1::4169")
|
|
icmph := packet.ICMP6Header{
|
|
IP6Header: packet.IP6Header{
|
|
IPProto: ipproto.ICMPv6,
|
|
Src: srcIP,
|
|
Dst: dst,
|
|
},
|
|
Type: packet.ICMP6EchoRequest,
|
|
Code: packet.ICMP6NoCode,
|
|
}
|
|
_, payload := packet.ICMPEchoPayload(nil)
|
|
icmpPing := packet.Generate(icmph, payload)
|
|
pkt := &packet.Parsed{}
|
|
pkt.Decode(icmpPing)
|
|
|
|
impl := makeNetstack(t, func(impl *Impl) {
|
|
impl.ProcessSubnets = true
|
|
})
|
|
pingDst, ok := impl.shouldHandlePing(pkt)
|
|
|
|
// Expect that we handle this since it's going out onto the
|
|
// network.
|
|
if !ok {
|
|
t.Errorf("expected shouldHandlePing==true")
|
|
}
|
|
if pingDst != dst {
|
|
t.Errorf("got dst %s; want %s", pingDst, dst)
|
|
}
|
|
})
|
|
|
|
t.Run("ICMP6-tailscale-addr", func(t *testing.T) {
|
|
dst := netip.MustParseAddr("fd7a:115c:a1e0:ab12::1")
|
|
icmph := packet.ICMP6Header{
|
|
IP6Header: packet.IP6Header{
|
|
IPProto: ipproto.ICMPv6,
|
|
Src: srcIP,
|
|
Dst: dst,
|
|
},
|
|
Type: packet.ICMP6EchoRequest,
|
|
Code: packet.ICMP6NoCode,
|
|
}
|
|
_, payload := packet.ICMPEchoPayload(nil)
|
|
icmpPing := packet.Generate(icmph, payload)
|
|
pkt := &packet.Parsed{}
|
|
pkt.Decode(icmpPing)
|
|
|
|
impl := makeNetstack(t, func(impl *Impl) {
|
|
impl.ProcessSubnets = true
|
|
})
|
|
_, ok := impl.shouldHandlePing(pkt)
|
|
|
|
// We don't handle this because it's a Tailscale IP and not 4via6
|
|
if ok {
|
|
t.Errorf("expected shouldHandlePing==false")
|
|
}
|
|
})
|
|
|
|
// Handle pings for 4via6 addresses regardless of ProcessSubnets
|
|
for _, subnets := range []bool{true, false} {
|
|
t.Run("ICMP6-4via6-ProcessSubnets-"+fmt.Sprint(subnets), func(t *testing.T) {
|
|
// The 4via6 route 10.1.1.0/24 siteid 7, and then the IP
|
|
// 10.1.1.9 within that route.
|
|
dst := netip.MustParseAddr("fd7a:115c:a1e0:b1a:0:7:a01:109")
|
|
expectedPingDst := netip.MustParseAddr("10.1.1.9")
|
|
icmph := packet.ICMP6Header{
|
|
IP6Header: packet.IP6Header{
|
|
IPProto: ipproto.ICMPv6,
|
|
Src: srcIP,
|
|
Dst: dst,
|
|
},
|
|
Type: packet.ICMP6EchoRequest,
|
|
Code: packet.ICMP6NoCode,
|
|
}
|
|
_, payload := packet.ICMPEchoPayload(nil)
|
|
icmpPing := packet.Generate(icmph, payload)
|
|
pkt := &packet.Parsed{}
|
|
pkt.Decode(icmpPing)
|
|
|
|
impl := makeNetstack(t, func(impl *Impl) {
|
|
impl.ProcessSubnets = subnets
|
|
})
|
|
pingDst, ok := impl.shouldHandlePing(pkt)
|
|
|
|
// Handled due to being 4via6
|
|
if !ok {
|
|
t.Errorf("expected shouldHandlePing==true")
|
|
} else if pingDst != expectedPingDst {
|
|
t.Errorf("got dst %s; want %s", pingDst, expectedPingDst)
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
// looksLikeATailscaleSelfAddress reports whether addr looks like
|
|
// a Tailscale self address, for tests.
|
|
func looksLikeATailscaleSelfAddress(addr netip.Addr) bool {
|
|
return addr.Is4() && tsaddr.IsTailscaleIP(addr) ||
|
|
addr.Is6() && tsaddr.Tailscale4To6Range().Contains(addr)
|
|
}
|
|
|
|
func TestShouldProcessInbound(t *testing.T) {
|
|
testCases := []struct {
|
|
name string
|
|
pkt *packet.Parsed
|
|
afterStart func(*Impl) // optional; after Impl.Start is called
|
|
beforeStart func(*Impl) // optional; before Impl.Start is called
|
|
want bool
|
|
runOnGOOS string
|
|
}{
|
|
{
|
|
name: "ipv6-via",
|
|
pkt: &packet.Parsed{
|
|
IPVersion: 6,
|
|
IPProto: ipproto.TCP,
|
|
Src: netip.MustParseAddrPort("100.101.102.103:1234"),
|
|
|
|
// $ tailscale debug via 7 10.1.1.9/24
|
|
// fd7a:115c:a1e0:b1a:0:7:a01:109/120
|
|
Dst: netip.MustParseAddrPort("[fd7a:115c:a1e0:b1a:0:7:a01:109]:5678"),
|
|
TCPFlags: packet.TCPSyn,
|
|
},
|
|
afterStart: func(i *Impl) {
|
|
prefs := ipn.NewPrefs()
|
|
prefs.AdvertiseRoutes = []netip.Prefix{
|
|
// $ tailscale debug via 7 10.1.1.0/24
|
|
// fd7a:115c:a1e0:b1a:0:7:a01:100/120
|
|
netip.MustParsePrefix("fd7a:115c:a1e0:b1a:0:7:a01:100/120"),
|
|
}
|
|
i.lb.Start(ipn.Options{
|
|
LegacyMigrationPrefs: prefs,
|
|
})
|
|
i.atomicIsLocalIPFunc.Store(looksLikeATailscaleSelfAddress)
|
|
},
|
|
beforeStart: func(i *Impl) {
|
|
// This should be handled even if we're
|
|
// otherwise not processing local IPs or
|
|
// subnets.
|
|
i.ProcessLocalIPs = false
|
|
i.ProcessSubnets = false
|
|
},
|
|
want: true,
|
|
},
|
|
{
|
|
name: "ipv6-via-not-advertised",
|
|
pkt: &packet.Parsed{
|
|
IPVersion: 6,
|
|
IPProto: ipproto.TCP,
|
|
Src: netip.MustParseAddrPort("100.101.102.103:1234"),
|
|
|
|
// $ tailscale debug via 7 10.1.1.9/24
|
|
// fd7a:115c:a1e0:b1a:0:7:a01:109/120
|
|
Dst: netip.MustParseAddrPort("[fd7a:115c:a1e0:b1a:0:7:a01:109]:5678"),
|
|
TCPFlags: packet.TCPSyn,
|
|
},
|
|
afterStart: func(i *Impl) {
|
|
prefs := ipn.NewPrefs()
|
|
prefs.AdvertiseRoutes = []netip.Prefix{
|
|
// tailscale debug via 7 10.1.2.0/24
|
|
// fd7a:115c:a1e0:b1a:0:7:a01:200/120
|
|
netip.MustParsePrefix("fd7a:115c:a1e0:b1a:0:7:a01:200/120"),
|
|
}
|
|
i.lb.Start(ipn.Options{
|
|
LegacyMigrationPrefs: prefs,
|
|
})
|
|
},
|
|
want: false,
|
|
},
|
|
{
|
|
name: "tailscale-ssh-enabled",
|
|
pkt: &packet.Parsed{
|
|
IPVersion: 4,
|
|
IPProto: ipproto.TCP,
|
|
Src: netip.MustParseAddrPort("100.101.102.103:1234"),
|
|
Dst: netip.MustParseAddrPort("100.101.102.104:22"),
|
|
TCPFlags: packet.TCPSyn,
|
|
},
|
|
afterStart: func(i *Impl) {
|
|
prefs := ipn.NewPrefs()
|
|
prefs.RunSSH = true
|
|
i.lb.Start(ipn.Options{
|
|
LegacyMigrationPrefs: prefs,
|
|
})
|
|
i.atomicIsLocalIPFunc.Store(func(addr netip.Addr) bool {
|
|
return addr.String() == "100.101.102.104" // Dst, above
|
|
})
|
|
},
|
|
want: true,
|
|
runOnGOOS: "linux",
|
|
},
|
|
{
|
|
name: "tailscale-ssh-disabled",
|
|
pkt: &packet.Parsed{
|
|
IPVersion: 4,
|
|
IPProto: ipproto.TCP,
|
|
Src: netip.MustParseAddrPort("100.101.102.103:1234"),
|
|
Dst: netip.MustParseAddrPort("100.101.102.104:22"),
|
|
TCPFlags: packet.TCPSyn,
|
|
},
|
|
afterStart: func(i *Impl) {
|
|
prefs := ipn.NewPrefs()
|
|
prefs.RunSSH = false // default, but to be explicit
|
|
i.lb.Start(ipn.Options{
|
|
LegacyMigrationPrefs: prefs,
|
|
})
|
|
i.atomicIsLocalIPFunc.Store(func(addr netip.Addr) bool {
|
|
return addr.String() == "100.101.102.104" // Dst, above
|
|
})
|
|
},
|
|
want: false,
|
|
},
|
|
{
|
|
name: "process-local-ips",
|
|
pkt: &packet.Parsed{
|
|
IPVersion: 4,
|
|
IPProto: ipproto.TCP,
|
|
Src: netip.MustParseAddrPort("100.101.102.103:1234"),
|
|
Dst: netip.MustParseAddrPort("100.101.102.104:4567"),
|
|
TCPFlags: packet.TCPSyn,
|
|
},
|
|
afterStart: func(i *Impl) {
|
|
i.ProcessLocalIPs = true
|
|
i.atomicIsLocalIPFunc.Store(func(addr netip.Addr) bool {
|
|
return addr.String() == "100.101.102.104" // Dst, above
|
|
})
|
|
},
|
|
want: true,
|
|
},
|
|
{
|
|
name: "process-subnets",
|
|
pkt: &packet.Parsed{
|
|
IPVersion: 4,
|
|
IPProto: ipproto.TCP,
|
|
Src: netip.MustParseAddrPort("100.101.102.103:1234"),
|
|
Dst: netip.MustParseAddrPort("10.1.2.3:4567"),
|
|
TCPFlags: packet.TCPSyn,
|
|
},
|
|
beforeStart: func(i *Impl) {
|
|
i.ProcessSubnets = true
|
|
},
|
|
afterStart: func(i *Impl) {
|
|
// For testing purposes, assume all Tailscale
|
|
// IPs are local; the Dst above is something
|
|
// not in that range.
|
|
i.atomicIsLocalIPFunc.Store(looksLikeATailscaleSelfAddress)
|
|
},
|
|
want: true,
|
|
},
|
|
{
|
|
name: "peerapi-port-subnet-router", // see #6235
|
|
pkt: &packet.Parsed{
|
|
IPVersion: 4,
|
|
IPProto: ipproto.TCP,
|
|
Src: netip.MustParseAddrPort("100.101.102.103:1234"),
|
|
Dst: netip.MustParseAddrPort("10.0.0.23:5555"),
|
|
TCPFlags: packet.TCPSyn,
|
|
},
|
|
beforeStart: func(i *Impl) {
|
|
// As if we were running on Linux where netstack isn't used.
|
|
i.ProcessSubnets = false
|
|
i.atomicIsLocalIPFunc.Store(func(netip.Addr) bool { return false })
|
|
},
|
|
afterStart: func(i *Impl) {
|
|
prefs := ipn.NewPrefs()
|
|
prefs.AdvertiseRoutes = []netip.Prefix{
|
|
netip.MustParsePrefix("10.0.0.1/24"),
|
|
}
|
|
i.lb.Start(ipn.Options{
|
|
LegacyMigrationPrefs: prefs,
|
|
})
|
|
|
|
// Set the PeerAPI port to the Dst port above.
|
|
i.peerapiPort4Atomic.Store(5555)
|
|
i.peerapiPort6Atomic.Store(5555)
|
|
},
|
|
want: false,
|
|
},
|
|
|
|
// TODO(andrew): test PeerAPI
|
|
// TODO(andrew): test TCP packets without the SYN flag set
|
|
}
|
|
|
|
for _, tc := range testCases {
|
|
t.Run(tc.name, func(t *testing.T) {
|
|
if tc.runOnGOOS != "" && runtime.GOOS != tc.runOnGOOS {
|
|
t.Skipf("skipping on GOOS=%v", runtime.GOOS)
|
|
}
|
|
impl := makeNetstack(t, tc.beforeStart)
|
|
if tc.afterStart != nil {
|
|
tc.afterStart(impl)
|
|
}
|
|
|
|
got := impl.shouldProcessInbound(tc.pkt, nil)
|
|
if got != tc.want {
|
|
t.Errorf("got shouldProcessInbound()=%v; want %v", got, tc.want)
|
|
} else {
|
|
t.Logf("OK: shouldProcessInbound() = %v", got)
|
|
}
|
|
})
|
|
}
|
|
}
|