TheArchive/tailscale
1
0
Fork 0
mirror of https://github.com/tailscale/tailscale.git synced 2025-08-13 22:47:30 +00:00
Code Issues Packages Projects Releases Wiki Activity

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

Browse Source 
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

52
tstest/natlab/vnet/vnet_test.go
View File

@@ -69,13 +69,15 @@ func TestPacketSideEffects(t *testing.T) {
netName: "v6",
setup: func() (*Server, error) {
var c Config
c.AddNode(c.AddNetwork("2000:52::1/64"))
nw := c.AddNetwork("2000:52::1/64")
c.AddNode(nw)
c.AddNode(nw)
return New(&c)
},
tests: []netTest{
{
name: "router-solicit",
pkt: mkIPv6RouterSolicit(nodeMac(1), netip.MustParseAddr("fe80::50cc:ccff:fecc:cc01")),
pkt: mkIPv6RouterSolicit(nodeMac(1), nodeLANIP6(1)),
check: all(
logSubstr("sending IPv6 router advertisement to 52:cc:cc:cc:cc:01 from 52:ee:ee:ee:ee:01"),
numPkts(1),
@@ -84,6 +86,16 @@ func TestPacketSideEffects(t *testing.T) {
pktSubstr("SrcMAC=52:ee:ee:ee:ee:01 DstMAC=52:cc:cc:cc:cc:01 EthernetType=IPv6"),
),
},
{
name: "all-nodes",
pkt: mkAllNodesPing(nodeMac(1), nodeLANIP6(1)),
check: all(
numPkts(1),
pktSubstr("SrcMAC=52:cc:cc:cc:cc:01 DstMAC=33:33:00:00:00:01"),
pktSubstr("SrcIP=fe80::50cc:ccff:fecc:cc01 DstIP=ff02::1"),
pktSubstr("TypeCode=EchoRequest"),
),
},
},
},
}
@@ -105,7 +117,9 @@ func TestPacketSideEffects(t *testing.T) {
})
}
s.handleEthernetFrameFromVM(tt.pkt)
if err := s.handleEthernetFrameFromVM(tt.pkt); err != nil {
t.Fatal(err)
}
if tt.check != nil {
if err := tt.check(se); err != nil {
t.Fatal(err)
@@ -156,13 +170,31 @@ func mkIPv6RouterSolicit(srcMAC MAC, srcIP netip.Addr) []byte {
}},
}
icmp.SetNetworkLayerForChecksum(ip)
buf := gopacket.NewSerializeBuffer()
options := gopacket.SerializeOptions{FixLengths: true, ComputeChecksums: true}
if err := gopacket.SerializeLayers(buf, options, ip, icmp, ra); err != nil {
panic(fmt.Sprintf("serializing ICMPv6 RA: %v", err))
}
return mkEth(macAllRouters, srcMAC, layers.EthernetTypeIPv6, mkPacket(ip, icmp, ra))
}
return mkEth(macAllRouters, srcMAC, layers.EthernetTypeIPv6, buf.Bytes())
func mkPacket(layers ...gopacket.SerializableLayer) []byte {
buf := gopacket.NewSerializeBuffer()
opts := gopacket.SerializeOptions{FixLengths: true, ComputeChecksums: true}
if err := gopacket.SerializeLayers(buf, opts, layers...); err != nil {
panic(fmt.Sprintf("serializing packet: %v", err))
}
return buf.Bytes()
}
func mkAllNodesPing(srcMAC MAC, srcIP netip.Addr) []byte {
ip := &layers.IPv6{
Version: 6,
HopLimit: 255,
NextHeader: layers.IPProtocolICMPv6,
SrcIP: srcIP.AsSlice(),
DstIP: net.ParseIP("ff02::1"), // all nodes
}
icmp := &layers.ICMPv6{
TypeCode: layers.CreateICMPv6TypeCode(layers.ICMPv6TypeEchoRequest, 0),
}
icmp.SetNetworkLayerForChecksum(ip)
return mkEth(macAllNodes, srcMAC, layers.EthernetTypeIPv6, mkPacket(ip, icmp))
}
// sideEffects gathers side effects as a result of sending a packet and tests
@@ -198,7 +230,7 @@ func logSubstr(sub string) func(*sideEffects) error {
return nil
}
}
return fmt.Errorf("expected log substring %q not found; log statements were %q", sub, se.logs)
return fmt.Errorf("expected log substring %q not found; log statements were:\n%s", sub, strings.Join(se.logs, "\n"))
}
}