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tstest/natlab: drop packets that can't be routed in a LAN.

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LANs are authoritative for their prefixes, so we should not bounce
packets back and forth to the default gateway in that case.

Signed-off-by: David Anderson <danderson@tailscale.com>
This commit is contained in:
David Anderson 2020-07-27 15:53:31 +00:00 committed by Dave Anderson
parent 37903a9056
commit 5a370d545a
1 changed files with 11 additions and 0 deletions
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11
tstest/natlab/natlab.go
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@ -184,6 +184,17 @@ func (n *Network) write(p *Packet) (num int, err error) {
defer n.mu.Unlock() defer n.mu.Unlock()
iface, ok := n.machine[p.Dst.IP] iface, ok := n.machine[p.Dst.IP]
if !ok { if !ok {
// If the destination is within the network's authoritative
// range, no route to host.
if p.Dst.IP.Is4() && n.Prefix4.Contains(p.Dst.IP) {
p.Trace("no route to %v", p.Dst.IP)
return len(p.Payload), nil
}
if p.Dst.IP.Is6() && n.Prefix6.Contains(p.Dst.IP) {
p.Trace("no route to %v", p.Dst.IP)
return len(p.Payload), nil
}
if n.defaultGW == nil { if n.defaultGW == nil {
p.Trace("no route to %v", p.Dst.IP) p.Trace("no route to %v", p.Dst.IP)
return len(p.Payload), nil return len(p.Payload), nil