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cmd/{containerboot,k8s-operator}: add 4via6 support in singleton egress (#19983)

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Add support for configuring egress to destinations reachable via 4via6
subnet routes, using either the synthesized 4via6 address or the MagicDNS
name (in the form <IPv4-with-hyphens>-via-<siteID>[.*]).

Also update the Connector to validate and advertise 4via6 subnet routes.

Export net/netutil.ValidateViaPrefix so it can be reused by the Connector
validation logic.

This change only affects standalone egress proxies — ProxyGroup egress
requires IPv6 support before it can use 4via6.

Updates #19334

Change-Id: I6faecd6eb61ab55fc0cd97fe417af6b6a12fe7fc

Signed-off-by: Becky Pauley <becky@tailscale.com>
This commit is contained in:
BeckyPauley
2026-06-18 16:13:10 +01:00
committed by GitHub
parent e3b16135b2
commit 35a1a413f9
5 changed files with 82 additions and 4 deletions
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cmd/k8s-operator/connector_test.go
+16
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@@ -145,6 +145,22 @@ func TestConnector(t *testing.T) {
expectReconciled(t, cr, "", "test")
expectEqual(t, fc, expectedSTS(t, fc, opts), removeResourceReqs)
// Set an invalid 4via6 route (site ID too large).
mustUpdate[tsapi.Connector](t, fc, "", "test", func(conn *tsapi.Connector) {
conn.Spec.SubnetRouter.AdvertiseRoutes = []tsapi.Route{"fd7a:115c:a1e0:b1a:1:0:a2c:0/116"}
})
expectReconciled(t, cr, "", "test")
// STS should still have the previous valid route, unchanged.
expectEqual(t, fc, expectedSTS(t, fc, opts), removeResourceReqs)
// Set a valid 4via6 route.
mustUpdate[tsapi.Connector](t, fc, "", "test", func(conn *tsapi.Connector) {
conn.Spec.SubnetRouter.AdvertiseRoutes = []tsapi.Route{"fd7a:115c:a1e0:b1a:0:1:a2c:0/116"}
})
opts.subnetRoutes = "fd7a:115c:a1e0:b1a:0:1:a2c:0/116"
expectReconciled(t, cr, "", "test")
expectEqual(t, fc, expectedSTS(t, fc, opts), removeResourceReqs)
// Delete the Connector.
if err = fc.Delete(context.Background(), cn); err != nil {
t.Fatalf("error deleting Connector: %v", err)