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wgengine/netstack: optimize shouldProcessInbound, avoiding 4via6 lookups

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All IPv6 packets for the self address were doing netip.Prefix.Contains
lookups.

If if we know they're for a self address (which we already previously
computed and have sitting in a bool), then they can't be for a 4via6
range.

Change-Id: Iaaaf1248cb3fecec229935a80548ead0eb4cb892
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2022-11-08 19:53:40 -08:00 committed by Brad Fitzpatrick
parent 2daf0f146c
commit 79472a4a6e
2 changed files with 11 additions and 3 deletions
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4
wgengine/netstack/netstack.go
View File

@ -559,8 +559,8 @@ func (ns *Impl) shouldProcessInbound(p *packet.Parsed, t *tstun.Wrapper) bool {
return true
}
}
if p.IPVersion == 6 && viaRange.Contains(p.Dst.Addr()) {
return ns.lb != nil && ns.lb.ShouldHandleViaIP(p.Dst.Addr())
if p.IPVersion == 6 && !isLocal && viaRange.Contains(dstIP) {
return ns.lb != nil && ns.lb.ShouldHandleViaIP(dstIP)
}
if !ns.ProcessLocalIPs && !ns.ProcessSubnets {
// Fast path for common case (e.g. Linux server in TUN mode) where

10
wgengine/netstack/netstack_test.go
View File

@ -259,6 +259,13 @@ func TestShouldHandlePing(t *testing.T) {
}
}
// 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
@ -289,6 +296,7 @@ func TestShouldProcessInbound(t *testing.T) {
StateKey: ipn.GlobalDaemonStateKey,
UpdatePrefs: prefs,
})
i.atomicIsLocalIPFunc.Store(looksLikeATailscaleSelfAddress)
// This should be handled even if we're
// otherwise not processing local IPs or
@ -400,7 +408,7 @@ func TestShouldProcessInbound(t *testing.T) {
// For testing purposes, assume all Tailscale
// IPs are local; the Dst above is something
// not in that range.
i.atomicIsLocalIPFunc.Store(tsaddr.IsTailscaleIP)
i.atomicIsLocalIPFunc.Store(looksLikeATailscaleSelfAddress)
},
want: true,
},