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tstest/natlab/vnet: add DHCP tests, ignore DHCPv4 on v6-only networks

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And clean up some of the test helpers in the process.

Updates #13038

Change-Id: I3e2b5f7028a32d97af7f91941e59399a8e222b25
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2024-08-29 07:02:49 -07:00
committed by Brad Fitzpatrick
parent ffa1c93f59
commit b1a5b40318
2 changed files with 110 additions and 23 deletions
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5
tstest/natlab/vnet/vnet.go
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@@ -1286,6 +1286,10 @@ func (n *network) handleUDPPacketForRouter(ep EthernetPacket, udp *layers.UDP, t
srcIP, dstIP := flow.src, flow.dst
if isDHCPRequest(packet) {
if !n.v4 {
n.logf("dropping DHCPv4 packet on v6-only network")
return
}
res, err := n.s.createDHCPResponse(packet)
if err != nil {
n.logf("createDHCPResponse: %v", err)
@@ -1587,6 +1591,7 @@ func (s *Server) createDHCPResponse(request gopacket.Packet) ([]byte, error) {
return mkPacketErr(eth, ip, udp, response)
}
// isDHCPRequest reports whether pkt is a DHCPv4 request.
func isDHCPRequest(pkt gopacket.Packet) bool {
v4, ok := pkt.Layer(layers.LayerTypeIPv4).(*layers.IPv4)
if !ok || v4.Protocol != layers.IPProtocolUDP {