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tstest/natlab/vnet: add IPv6 all-nodes support

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This adds support for sending packets to 33:33:00:00:01 at IPv6
multicast address ff02::1 to send to all nodes.

Nothing in Tailscale depends on this (yet?), but it makes debugging in
VMs behind natlab easier (e.g. you can ping all nodes), and other
things might depend on this in the future.

Mostly I'm trying to flesh out the IPv6 support in natlab now that we
can write vnet tests.

Updates #13038

Change-Id: If590031fcf075690ca35c7b230a38c3e72e621eb
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2024-08-28 08:06:17 -07:00
committed by Brad Fitzpatrick
parent 961ee321e8
commit 73b3c8fc8c
3 changed files with 77 additions and 20 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
tstest/natlab/vnet/conf.go
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@@ -65,6 +65,16 @@ func nodeMac(n int) MAC {
return MAC{0x52, 0xcc, 0xcc, 0xcc, 0xcc, byte(n)}
}
var lanSLAACBase = netip.MustParseAddr("fe80::50cc:ccff:fecc:cc01")
// nodeLANIP6 returns a node number's Link Local SLAAC IPv6 address,
// such as fe80::50cc:ccff:fecc:cc03 for node 3.
func nodeLANIP6(n int) netip.Addr {
a := lanSLAACBase.As16()
a[15] = byte(n)
return netip.AddrFrom16(a)
}
// AddNode creates a new node in the world.
//
// The opts may be of the following types:
@@ -128,6 +138,7 @@ type TailscaledEnv struct {
// The opts may be of the following types:
// - string IP address, for the network's WAN IP (if any)
// - string netip.Prefix, for the network's LAN IP (defaults to 192.168.0.0/24)
// if IPv4, or its WAN IPv6 + CIDR (e.g. "2000:52::1/64")
// - NAT, the type of NAT to use
// - NetworkService, a service to add to the network
//