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tstest/natlab/vnet: add more tests

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This adds tests for DNS requests, and ignoring IPv6 packets on v4-only
networks.

No behavior changes. But some things are pulled out into functions.

And the mkPacket helpers previously just for tests are moved into
non-test code to be used elsewhere to reduce duplication, doing the
checksum stuff automatically.

Updates #13038

Change-Id: I4dd0b73c75b2b9567b4be3f05a2792999d83f6a3
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2024-08-28 12:55:46 -07:00
committed by Brad Fitzpatrick
parent d21ebc28af
commit 82c2c5c597
3 changed files with 155 additions and 31 deletions
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7
tstest/natlab/vnet/conf.go
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@@ -65,6 +65,11 @@ func nodeMac(n int) MAC {
return MAC{0x52, 0xcc, 0xcc, 0xcc, 0xcc, byte(n)}
}
func routerMac(n int) MAC {
// 52=TS then 0xee for 'etwork
return MAC{0x52, 0xee, 0xee, 0xee, 0xee, byte(n)}
}
var lanSLAACBase = netip.MustParseAddr("fe80::50cc:ccff:fecc:cc01")
// nodeLANIP6 returns a node number's Link Local SLAAC IPv6 address,
@@ -148,7 +153,7 @@ func (c *Config) AddNetwork(opts ...any) *Network {
num := len(c.networks) + 1
n := &Network{
num: num,
mac: MAC{0x52, 0xee, 0xee, 0xee, 0xee, byte(num)}, // 52=TS then 0xee for 'etwork
mac: routerMac(num),
}
c.networks = append(c.networks, n)
for _, o := range opts {