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// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package netstack
import (
"fmt"
"net/netip"
"runtime"
"testing"
"gvisor.dev/gvisor/pkg/refs"
"tailscale.com/net/packet"
"tailscale.com/net/tsdial"
"tailscale.com/net/tstun"
"tailscale.com/types/ipproto"
"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...)
}
}
eng, err := wgengine.NewUserspaceEngine(logf, wgengine.Config{
Tun: tunDev,
Dialer: dialer,
})
if err != nil {
t.Fatal(err)
}
defer eng.Close()
ig, ok := eng.(wgengine.InternalsGetter)
if !ok {
t.Fatal("not an InternalsGetter")
}
tunWrap, magicSock, dns, ok := ig.GetInternals()
if !ok {
t.Fatal("failed to get internals")
}
ns, err := Create(logf, tunWrap, eng, magicSock, dialer, dns)
if err != nil {
t.Fatal(err)
}
defer ns.Close()
ns.ProcessLocalIPs = true
if err := ns.Start(); 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 TestNetstackLeakMode(t *testing.T) {
// See the comments in init(), and/or in issue #4309.
// Influenced by an envknob that may be useful in tests, so just check that
// it's not the oddly behaving zero value.
if refs.GetLeakMode() == 0 {
t.Fatalf("refs.leakMode is 0, want a non-zero value")
}
}
func makeNetstack(t *testing.T, config func(*Impl)) *Impl {
tunDev := tstun.NewFake()
dialer := new(tsdial.Dialer)
logf := func(format string, args ...any) {
if !t.Failed() {
t.Helper()
t.Logf(format, args...)
}
}
eng, err := wgengine.NewUserspaceEngine(logf, wgengine.Config{
Tun: tunDev,
Dialer: dialer,
})
if err != nil {
t.Fatal(err)
}
t.Cleanup(func() { eng.Close() })
ig, ok := eng.(wgengine.InternalsGetter)
if !ok {
t.Fatal("not an InternalsGetter")
}
tunWrap, magicSock, dns, ok := ig.GetInternals()
if !ok {
t.Fatal("failed to get internals")
}
ns, err := Create(logf, tunWrap, eng, magicSock, dialer, dns)
if err != nil {
t.Fatal(err)
}
t.Cleanup(func() { ns.Close() })
ns.atomicIsLocalIPFunc.Store(func(netip.Addr) bool { return true })
config(ns)
if err := ns.Start(); 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)
}
})
}
}
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